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 vlib_error_desc_t tcp_input_error_counters[] = {
25 #define tcp_error(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##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_tstamp (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, SESSION_E_REFUSED);
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 */
218 tc->rst_state = tc->state;
221 case TCP_STATE_ESTABLISHED:
222 tcp_connection_timers_reset (tc);
223 tcp_cong_recovery_off (tc);
224 tcp_program_reset_ntf (wrk, tc);
225 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
226 tcp_program_cleanup (wrk, tc);
228 case TCP_STATE_CLOSE_WAIT:
229 case TCP_STATE_FIN_WAIT_1:
230 case TCP_STATE_FIN_WAIT_2:
231 case TCP_STATE_CLOSING:
232 case TCP_STATE_LAST_ACK:
233 tcp_connection_timers_reset (tc);
234 tcp_cong_recovery_off (tc);
235 tcp_program_reset_ntf (wrk, tc);
236 /* Make sure we mark the session as closed. In some states we may
237 * be still trying to send data */
238 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
239 tcp_program_cleanup (wrk, tc);
241 case TCP_STATE_CLOSED:
242 case TCP_STATE_TIME_WAIT:
245 TCP_DBG ("reset state: %u", tc->state);
250 * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19
252 * It first verifies if segment has a wrapped sequence number (PAWS) and then
253 * does the processing associated to the first four steps (ignoring security
254 * and precedence): sequence number, rst bit and syn bit checks.
256 * @return 0 if segments passes validation.
259 tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0,
260 vlib_buffer_t * b0, tcp_header_t * th0, u32 * error0)
262 /* We could get a burst of RSTs interleaved with acks */
263 if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED))
265 tcp_send_reset (tc0);
266 *error0 = TCP_ERROR_CONNECTION_CLOSED;
270 if (PREDICT_FALSE (!tcp_ack (th0) && !tcp_rst (th0) && !tcp_syn (th0)))
272 *error0 = TCP_ERROR_SEGMENT_INVALID;
276 if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts, 0)))
278 *error0 = TCP_ERROR_OPTIONS;
282 if (PREDICT_FALSE (tcp_segment_check_paws (tc0)))
284 *error0 = TCP_ERROR_PAWS;
285 TCP_EVT (TCP_EVT_PAWS_FAIL, tc0, vnet_buffer (b0)->tcp.seq_number,
286 vnet_buffer (b0)->tcp.seq_end);
288 /* If it just so happens that a segment updates tsval_recent for a
289 * segment over 24 days old, invalidate tsval_recent. */
290 if (timestamp_lt (tc0->tsval_recent_age + TCP_PAWS_IDLE,
291 tcp_time_tstamp (tc0->c_thread_index)))
293 tc0->tsval_recent = tc0->rcv_opts.tsval;
294 clib_warning ("paws failed: 24-day old segment");
296 /* Drop after ack if not rst. Resets can fail paws check as per
297 * RFC 7323 sec. 5.2: When an <RST> segment is received, it MUST NOT
298 * be subjected to the PAWS check by verifying an acceptable value in
300 else if (!tcp_rst (th0))
302 tcp_program_ack (tc0);
303 TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
308 /* 1st: check sequence number */
309 if (!tcp_segment_in_rcv_wnd (tc0, vnet_buffer (b0)->tcp.seq_number,
310 vnet_buffer (b0)->tcp.seq_end))
312 /* SYN/SYN-ACK retransmit */
314 && vnet_buffer (b0)->tcp.seq_number == tc0->rcv_nxt - 1)
316 tcp_options_parse (th0, &tc0->rcv_opts, 1);
317 if (tc0->state == TCP_STATE_SYN_RCVD)
319 tcp_send_synack (tc0);
320 TCP_EVT (TCP_EVT_SYN_RCVD, tc0, 0);
321 *error0 = TCP_ERROR_SYNS_RCVD;
325 tcp_program_ack (tc0);
326 TCP_EVT (TCP_EVT_SYNACK_RCVD, tc0);
327 *error0 = TCP_ERROR_SYN_ACKS_RCVD;
332 /* If our window is 0 and the packet is in sequence, let it pass
333 * through for ack processing. It should be dropped later. */
334 if (tc0->rcv_wnd < tc0->snd_mss
335 && tc0->rcv_nxt == vnet_buffer (b0)->tcp.seq_number)
338 /* If we entered recovery and peer did so as well, there's a chance that
339 * dup acks won't be acceptable on either end because seq_end may be less
340 * than rcv_las. This can happen if acks are lost in both directions. */
341 if (tcp_in_recovery (tc0)
342 && seq_geq (vnet_buffer (b0)->tcp.seq_number,
343 tc0->rcv_las - tc0->rcv_wnd)
344 && seq_leq (vnet_buffer (b0)->tcp.seq_end,
345 tc0->rcv_nxt + tc0->rcv_wnd))
348 *error0 = TCP_ERROR_RCV_WND;
350 /* If we advertised a zero rcv_wnd and the segment is in the past or the
351 * next one that we expect, it is probably a window probe */
352 if ((tc0->flags & TCP_CONN_ZERO_RWND_SENT)
353 && seq_lt (vnet_buffer (b0)->tcp.seq_end,
354 tc0->rcv_las + tc0->rcv_opts.mss))
355 *error0 = TCP_ERROR_ZERO_RWND;
357 tc0->errors.below_data_wnd += seq_lt (vnet_buffer (b0)->tcp.seq_end,
360 /* If not RST, send dup ack */
363 tcp_program_dupack (tc0);
364 TCP_EVT (TCP_EVT_DUPACK_SENT, tc0, vnet_buffer (b0)->tcp);
372 /* 2nd: check the RST bit */
373 if (PREDICT_FALSE (tcp_rst (th0)))
375 tcp_rcv_rst (wrk, tc0);
376 *error0 = TCP_ERROR_RST_RCVD;
380 /* 3rd: check security and precedence (skip) */
382 /* 4th: check the SYN bit (in window) */
383 if (PREDICT_FALSE (tcp_syn (th0)))
385 /* As per RFC5961 send challenge ack instead of reset */
386 tcp_program_ack (tc0);
387 *error0 = TCP_ERROR_SPURIOUS_SYN;
391 /* If segment in window, save timestamp */
392 tcp_update_timestamp (tc0, vnet_buffer (b0)->tcp.seq_number,
393 vnet_buffer (b0)->tcp.seq_end);
401 tcp_rcv_ack_no_cc (tcp_connection_t * tc, vlib_buffer_t * b, u32 * error)
403 /* SND.UNA =< SEG.ACK =< SND.NXT */
404 if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number)
405 && seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
407 if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
408 && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
410 tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
413 *error = TCP_ERROR_ACK_INVALID;
418 tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
419 tc->snd_una = vnet_buffer (b)->tcp.ack_number;
420 *error = TCP_ERROR_ACK_OK;
425 * Compute smoothed RTT as per VJ's '88 SIGCOMM and RFC6298
427 * Note that although in the original article srtt and rttvar are scaled
428 * to minimize round-off errors, here we don't. Instead, we rely on
429 * better precision time measurements.
431 * A known limitation of the algorithm is that a drop in rtt results in a
432 * rttvar increase and bigger RTO.
434 * mrtt must be provided in @ref TCP_TICK multiples, i.e., in us. Note that
435 * timestamps are measured as ms ticks so they must be converted before
436 * calling this function.
439 tcp_estimate_rtt (tcp_connection_t * tc, u32 mrtt)
443 err = mrtt - tc->srtt;
444 tc->srtt = clib_max ((int) tc->srtt + (err >> 3), 1);
445 diff = (clib_abs (err) - (int) tc->rttvar) >> 2;
446 tc->rttvar = clib_max ((int) tc->rttvar + diff, 1);
450 tcp_estimate_rtt_us (tcp_connection_t * tc, f64 mrtt)
452 tc->mrtt_us = tc->mrtt_us + (mrtt - tc->mrtt_us) * 0.125;
456 * Update rtt estimate
458 * We have potentially three sources of rtt measurements:
460 * TSOPT difference between current and echoed timestamp. It has ms
461 * precision and can be computed per ack
462 * ACK timing one sequence number is tracked per rtt with us (micro second)
464 * rate sample if enabled, all outstanding bytes are tracked with us
465 * precision. Every ack and sack are a rtt sample
467 * Middle boxes are known to fiddle with TCP options so we give higher
468 * priority to ACK timing.
470 * For now, rate sample rtts are only used under congestion.
473 tcp_update_rtt (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 ack)
477 /* Karn's rule, part 1. Don't use retransmitted segments to estimate
478 * RTT because they're ambiguous. */
479 if (tcp_in_cong_recovery (tc))
481 /* Accept rtt estimates for samples that have not been retransmitted */
482 if (!(tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
483 || (rs->flags & TCP_BTS_IS_RXT))
486 tcp_estimate_rtt_us (tc, rs->rtt_time);
487 mrtt = rs->rtt_time * THZ;
491 if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq))
493 f64 sample = tcp_time_now_us (tc->c_thread_index) - tc->rtt_ts;
494 tcp_estimate_rtt_us (tc, sample);
495 mrtt = clib_max ((u32) (sample * THZ), 1);
496 /* Allow measuring of a new RTT */
499 /* As per RFC7323 TSecr can be used for RTTM only if the segment advances
500 * snd_una, i.e., the left side of the send window:
501 * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */
502 else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr)
504 mrtt = clib_max (tcp_tstamp (tc) - tc->rcv_opts.tsecr, 1);
505 mrtt *= TCP_TSTP_TO_HZ;
510 /* Ignore dubious measurements */
511 if (mrtt == 0 || mrtt > TCP_RTT_MAX)
514 tcp_estimate_rtt (tc, mrtt);
518 /* If we got here something must've been ACKed so make sure boff is 0,
519 * even if mrtt is not valid since we update the rto lower */
527 tcp_estimate_initial_rtt (tcp_connection_t * tc)
529 u8 thread_index = vlib_num_workers ()? 1 : 0;
534 tc->mrtt_us = tcp_time_now_us (thread_index) - tc->rtt_ts;
535 tc->mrtt_us = clib_max (tc->mrtt_us, 0.0001);
536 mrtt = clib_max ((u32) (tc->mrtt_us * THZ), 1);
541 mrtt = tcp_tstamp (tc) - tc->rcv_opts.tsecr;
542 mrtt = clib_max (mrtt, 1) * TCP_TSTP_TO_HZ;
543 /* Due to retransmits we don't know the initial mrtt */
544 if (tc->rto_boff && mrtt > 1 * THZ)
546 tc->mrtt_us = (f64) mrtt *TCP_TICK;
549 if (mrtt > 0 && mrtt < TCP_RTT_MAX)
551 /* First measurement as per RFC 6298 */
553 tc->rttvar = mrtt >> 1;
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_nxt - tc->snd_una);
585 if (tcp_is_descheduled (tc))
588 /* If everything has been acked, stop retransmit timer
589 * otherwise update. */
590 tcp_retransmit_timer_update (&wrk->timer_wheel, tc);
592 /* Update pacer based on our new cwnd estimate */
593 tcp_connection_tx_pacer_update (tc);
597 vec_set_len (wrk->pending_deq_acked, 0);
601 tcp_program_dequeue (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
603 if (!(tc->flags & TCP_CONN_DEQ_PENDING))
605 vec_add1 (wrk->pending_deq_acked, tc->c_c_index);
606 tc->flags |= TCP_CONN_DEQ_PENDING;
608 tc->burst_acked += tc->bytes_acked;
612 * Try to update snd_wnd based on feedback received from peer.
614 * If successful, and new window is 'effectively' 0, activate persist
618 tcp_update_snd_wnd (tcp_connection_t * tc, u32 seq, u32 ack, u32 snd_wnd)
620 /* If (SND.WL1 < SEG.SEQ or (SND.WL1 = SEG.SEQ and SND.WL2 =< SEG.ACK)), set
621 * SND.WND <- SEG.WND, set SND.WL1 <- SEG.SEQ, and set SND.WL2 <- SEG.ACK */
622 if (seq_lt (tc->snd_wl1, seq)
623 || (tc->snd_wl1 == seq && seq_leq (tc->snd_wl2, ack)))
625 tc->snd_wnd = snd_wnd;
628 TCP_EVT (TCP_EVT_SND_WND, tc);
630 if (PREDICT_FALSE (tc->snd_wnd < tc->snd_mss))
632 if (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))
634 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
636 /* Set persist timer if we just got 0 wnd. If already set,
637 * update it because some data sent with snd_wnd < snd_mss was
639 if (tcp_timer_is_active (tc, TCP_TIMER_PERSIST))
640 tcp_persist_timer_reset (&wrk->timer_wheel, tc);
641 tcp_persist_timer_set (&wrk->timer_wheel, tc);
646 if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST)))
648 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
649 tcp_persist_timer_reset (&wrk->timer_wheel, tc);
652 if (PREDICT_FALSE (tcp_is_descheduled (tc)))
655 if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0))
665 * Init loss recovery/fast recovery.
667 * Triggered by dup acks as opposed to timer timeout. Note that cwnd is
668 * updated in @ref tcp_cc_handle_event after fast retransmit
671 tcp_cc_init_congestion (tcp_connection_t * tc)
673 tcp_fastrecovery_on (tc);
674 tc->snd_congestion = tc->snd_nxt;
675 tc->cwnd_acc_bytes = 0;
676 tc->snd_rxt_bytes = 0;
677 tc->rxt_delivered = 0;
678 tc->prr_delivered = 0;
679 tc->prr_start = tc->snd_una;
680 tc->prev_ssthresh = tc->ssthresh;
681 tc->prev_cwnd = tc->cwnd;
683 tc->snd_rxt_ts = tcp_tstamp (tc);
684 tcp_cc_congestion (tc);
686 /* Post retransmit update cwnd to ssthresh and account for the
687 * three segments that have left the network and should've been
688 * buffered at the receiver XXX */
689 if (!tcp_opts_sack_permitted (&tc->rcv_opts))
690 tc->cwnd += TCP_DUPACK_THRESHOLD * tc->snd_mss;
692 tc->fr_occurences += 1;
693 TCP_EVT (TCP_EVT_CC_EVT, tc, 4);
697 tcp_cc_congestion_undo (tcp_connection_t * tc)
699 tc->cwnd = tc->prev_cwnd;
700 tc->ssthresh = tc->prev_ssthresh;
701 tcp_cc_undo_recovery (tc);
702 ASSERT (tc->rto_boff == 0);
703 TCP_EVT (TCP_EVT_CC_EVT, tc, 5);
707 tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc)
709 return (tcp_in_recovery (tc) && tc->rto_boff == 1
711 && tcp_opts_tstamp (&tc->rcv_opts)
712 && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts));
716 tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
718 return (tcp_cc_is_spurious_timeout_rxt (tc));
722 tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack)
726 /* If of of the two conditions lower hold, reset dupacks because
727 * we're probably after timeout (RFC6582 heuristics).
728 * If Cumulative ack does not cover more than congestion threshold,
730 * 1) The following doesn't hold: The congestion window is greater
731 * than SMSS bytes and the difference between highest_ack
732 * and prev_highest_ack is at most 4*SMSS bytes
733 * 2) Echoed timestamp in the last non-dup ack does not equal the
736 if (seq_leq (tc->snd_una, tc->snd_congestion)
737 && ((!(tc->cwnd > tc->snd_mss
738 && tc->bytes_acked <= 4 * tc->snd_mss))
739 || (tc->rcv_opts.tsecr != tc->tsecr_last_ack)))
745 return tc->sack_sb.lost_bytes || tc->rcv_dupacks >= tc->sack_sb.reorder;
749 tcp_cc_try_recover (tcp_connection_t *tc)
751 sack_scoreboard_hole_t *hole;
754 ASSERT (tcp_in_cong_recovery (tc));
756 if (tcp_cc_is_spurious_retransmit (tc))
758 tcp_cc_congestion_undo (tc);
762 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
764 tcp_recovery_off (tc);
766 /* Previous recovery left us congested. Continue sending as part
767 * of the current recovery event with an updated snd_congestion */
768 if (tc->sack_sb.sacked_bytes && tcp_in_fastrecovery (tc))
770 tc->snd_congestion = tc->snd_nxt;
774 tc->rxt_delivered = 0;
775 tc->snd_rxt_bytes = 0;
777 tc->prr_delivered = 0;
779 tc->flags &= ~TCP_CONN_RXT_PENDING;
781 hole = scoreboard_first_hole (&tc->sack_sb);
782 if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt)
783 scoreboard_clear (&tc->sack_sb);
785 if (tcp_in_fastrecovery (tc) && !is_spurious)
786 tcp_cc_recovered (tc);
788 tcp_fastrecovery_off (tc);
789 tcp_fastrecovery_first_off (tc);
790 TCP_EVT (TCP_EVT_CC_EVT, tc, 3);
792 ASSERT (tc->rto_boff == 0);
793 ASSERT (!tcp_in_cong_recovery (tc));
794 ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
800 tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs)
802 ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc));
804 /* Congestion avoidance */
805 tcp_cc_rcv_ack (tc, rs);
807 /* If a cumulative ack, make sure dupacks is 0 */
812 * One function to rule them all ... and in the darkness bind them
815 tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
818 u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts);
820 /* If reneging, wait for timer based retransmits */
821 if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging))
825 * If not in recovery, figure out if we should enter
827 if (!tcp_in_cong_recovery (tc))
832 TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
833 tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
835 if (tcp_should_fastrecover (tc, has_sack))
837 tcp_cc_init_congestion (tc);
840 scoreboard_init_rxt (&tc->sack_sb, tc->snd_una);
842 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
843 tcp_program_retransmit (tc);
850 * Already in recovery
854 * See if we can exit and stop retransmitting
856 if (seq_geq (tc->snd_una, tc->snd_congestion))
858 /* If successfully recovered, treat ack as congestion avoidance ack
859 * and return. Otherwise, we're still congested so process feedback */
860 if (!tcp_cc_try_recover (tc))
862 tcp_cc_rcv_ack (tc, rs);
868 * Process (re)transmit feedback. Output path uses this to decide how much
869 * more data to release into the network
873 if (!tc->bytes_acked && tc->sack_sb.rxt_sacked)
874 tcp_fastrecovery_first_on (tc);
876 tc->rxt_delivered += tc->sack_sb.rxt_sacked;
877 tc->prr_delivered += rs->delivered;
883 tc->rcv_dupacks += 1;
884 TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
886 tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked,
889 tc->prr_delivered += clib_min (tc->snd_mss,
890 tc->snd_nxt - tc->snd_una);
892 tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked,
896 /* If partial ack, assume that the first un-acked segment was lost */
897 if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
898 tcp_fastrecovery_first_on (tc);
901 tcp_program_retransmit (tc);
904 * Notify cc of the event
907 if (!tc->bytes_acked)
909 tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
913 /* RFC6675: If the incoming ACK is a cumulative acknowledgment,
914 * reset dupacks to 0. Also needed if in congestion recovery */
917 if (tcp_in_recovery (tc))
918 tcp_cc_rcv_ack (tc, rs);
920 tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs);
924 tcp_handle_old_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs)
926 if (!tcp_in_cong_recovery (tc))
929 if (tcp_opts_sack_permitted (&tc->rcv_opts))
930 tcp_rcv_sacks (tc, tc->snd_una);
934 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
935 tcp_bt_sample_delivery_rate (tc, rs);
937 tcp_cc_handle_event (tc, rs, 1);
941 * Check if duplicate ack as per RFC5681 Sec. 2
944 tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd,
947 return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una)
948 && seq_gt (tc->snd_nxt, tc->snd_una)
949 && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number)
950 && (prev_snd_wnd == tc->snd_wnd));
954 * Checks if ack is a congestion control event.
957 tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b,
958 u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack)
960 /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are
961 * defined to be 'duplicate' as well */
962 *is_dack = tc->sack_sb.last_sacked_bytes
963 || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una);
965 return (*is_dack || tcp_in_cong_recovery (tc));
969 * Process incoming ACK
972 tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
973 tcp_header_t * th, u32 * error)
975 u32 prev_snd_wnd, prev_snd_una;
976 tcp_rate_sample_t rs = { 0 };
979 TCP_EVT (TCP_EVT_CC_STAT, tc);
981 /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */
982 if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
984 /* We've probably entered recovery and the peer still has some
985 * of the data we've sent. Update snd_nxt and accept the ack */
986 if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
987 && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
989 tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
993 tc->errors.above_ack_wnd += 1;
994 *error = TCP_ERROR_ACK_FUTURE;
995 TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 0, vnet_buffer (b)->tcp.ack_number);
999 /* If old ACK, probably it's an old dupack */
1000 if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)))
1002 tc->errors.below_ack_wnd += 1;
1003 *error = TCP_ERROR_ACK_OLD;
1004 TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 1, vnet_buffer (b)->tcp.ack_number);
1006 if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd))
1009 tcp_handle_old_ack (tc, &rs);
1011 /* Don't drop yet */
1018 * Looks okay, process feedback
1021 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1022 tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number);
1024 prev_snd_wnd = tc->snd_wnd;
1025 prev_snd_una = tc->snd_una;
1026 tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number,
1027 vnet_buffer (b)->tcp.ack_number,
1028 clib_net_to_host_u16 (th->window) << tc->snd_wscale);
1029 tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
1030 tc->snd_una = vnet_buffer (b)->tcp.ack_number;
1031 tcp_validate_txf_size (tc, tc->bytes_acked);
1033 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
1034 tcp_bt_sample_delivery_rate (tc, &rs);
1036 rs.delivered = tc->bytes_acked + tc->sack_sb.last_sacked_bytes -
1037 tc->sack_sb.last_bytes_delivered;
1039 if (tc->bytes_acked + tc->sack_sb.last_sacked_bytes)
1041 tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number);
1042 if (tc->bytes_acked)
1043 tcp_program_dequeue (wrk, tc);
1046 TCP_EVT (TCP_EVT_ACK_RCVD, tc);
1049 * Check if we have congestion event
1052 if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack))
1054 tcp_cc_handle_event (tc, &rs, is_dack);
1055 tc->dupacks_in += is_dack;
1056 if (!tcp_in_cong_recovery (tc))
1058 *error = TCP_ERROR_ACK_OK;
1061 *error = TCP_ERROR_ACK_DUP;
1062 if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th))
1068 * Update congestion control (slow start/congestion avoidance)
1070 tcp_cc_update (tc, &rs);
1071 *error = TCP_ERROR_ACK_OK;
1076 tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1078 if (!tcp_disconnect_pending (tc))
1080 vec_add1 (wrk->pending_disconnects, tc->c_c_index);
1081 tcp_disconnect_pending_on (tc);
1086 tcp_handle_disconnects (tcp_worker_ctx_t * wrk)
1088 u32 thread_index, *pending_disconnects, *pending_resets;
1089 tcp_connection_t *tc;
1092 if (vec_len (wrk->pending_disconnects))
1094 thread_index = wrk->vm->thread_index;
1095 pending_disconnects = wrk->pending_disconnects;
1096 for (i = 0; i < vec_len (pending_disconnects); i++)
1098 tc = tcp_connection_get (pending_disconnects[i], thread_index);
1099 tcp_disconnect_pending_off (tc);
1100 session_transport_closing_notify (&tc->connection);
1102 vec_set_len (wrk->pending_disconnects, 0);
1105 if (vec_len (wrk->pending_resets))
1107 thread_index = wrk->vm->thread_index;
1108 pending_resets = wrk->pending_resets;
1109 for (i = 0; i < vec_len (pending_resets); i++)
1111 tc = tcp_connection_get (pending_resets[i], thread_index);
1112 tcp_disconnect_pending_off (tc);
1113 tcp_handle_rst (tc);
1115 vec_set_len (wrk->pending_resets, 0);
1120 tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
1123 /* Reject out-of-order fins */
1124 if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt)
1127 /* Account for the FIN and send ack */
1129 tc->flags |= TCP_CONN_FINRCVD;
1130 tcp_program_ack (tc);
1131 /* Enter CLOSE-WAIT and notify session. To avoid lingering
1132 * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
1133 tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
1134 tcp_program_disconnect (wrk, tc);
1135 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
1136 tcp_cfg.closewait_time);
1137 TCP_EVT (TCP_EVT_FIN_RCVD, tc);
1138 *error = TCP_ERROR_FIN_RCVD;
1141 /** Enqueue data for delivery to application */
1143 tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
1146 int written, error = TCP_ERROR_ENQUEUED;
1148 ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
1150 written = session_enqueue_stream_connection (&tc->connection, b, 0,
1151 1 /* queue event */ , 1);
1152 tc->bytes_in += written;
1154 TCP_EVT (TCP_EVT_INPUT, tc, 0, data_len, written);
1156 /* Update rcv_nxt */
1157 if (PREDICT_TRUE (written == data_len))
1159 tc->rcv_nxt += written;
1161 /* If more data written than expected, account for out-of-order bytes. */
1162 else if (written > data_len)
1164 tc->rcv_nxt += written;
1165 TCP_EVT (TCP_EVT_CC_INPUT, tc, data_len, written);
1167 else if (written > 0)
1169 /* We've written something but FIFO is probably full now */
1170 tc->rcv_nxt += written;
1171 error = TCP_ERROR_PARTIALLY_ENQUEUED;
1175 /* Packet made it through for ack processing */
1176 if (tc->rcv_wnd < tc->snd_mss)
1177 return TCP_ERROR_ZERO_RWND;
1179 return TCP_ERROR_FIFO_FULL;
1182 /* Update SACK list if need be */
1183 if (tcp_opts_sack_permitted (&tc->rcv_opts) && vec_len (tc->snd_sacks))
1185 /* Remove SACK blocks that have been delivered */
1186 tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
1192 /** Enqueue out-of-order data */
1194 tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
1200 ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
1203 /* Enqueue out-of-order data with relative offset */
1204 rv = session_enqueue_stream_connection (&tc->connection, b,
1205 vnet_buffer (b)->tcp.seq_number -
1206 tc->rcv_nxt, 0 /* queue event */ ,
1209 /* Nothing written */
1212 TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, 0);
1213 return TCP_ERROR_FIFO_FULL;
1216 TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, data_len);
1217 tc->bytes_in += data_len;
1219 /* Update SACK list if in use */
1220 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1222 ooo_segment_t *newest;
1225 s0 = session_get (tc->c_s_index, tc->c_thread_index);
1227 /* Get the newest segment from the fifo */
1228 newest = svm_fifo_newest_ooo_segment (s0->rx_fifo);
1231 offset = ooo_segment_offset_prod (s0->rx_fifo, newest);
1232 ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt);
1233 start = tc->rcv_nxt + offset;
1234 end = start + ooo_segment_length (s0->rx_fifo, newest);
1235 tcp_update_sack_list (tc, start, end);
1236 svm_fifo_newest_ooo_segment_reset (s0->rx_fifo);
1237 TCP_EVT (TCP_EVT_CC_SACKS, tc);
1241 return TCP_ERROR_ENQUEUED_OOO;
1245 tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop)
1247 u32 discard, first = b->current_length;
1248 vlib_main_t *vm = vlib_get_main ();
1250 /* Handle multi-buffer segments */
1251 if (n_bytes_to_drop > b->current_length)
1253 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
1257 discard = clib_min (n_bytes_to_drop, b->current_length);
1258 vlib_buffer_advance (b, discard);
1259 b = vlib_get_buffer (vm, b->next_buffer);
1260 n_bytes_to_drop -= discard;
1262 while (n_bytes_to_drop);
1263 if (n_bytes_to_drop > first)
1264 b->total_length_not_including_first_buffer -= n_bytes_to_drop - first;
1267 vlib_buffer_advance (b, n_bytes_to_drop);
1268 vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop;
1273 * Receive buffer for connection and handle acks
1275 * It handles both in order or out-of-order data.
1278 tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1281 u32 error, n_bytes_to_drop, n_data_bytes;
1283 vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset);
1284 n_data_bytes = vnet_buffer (b)->tcp.data_len;
1285 ASSERT (n_data_bytes);
1286 tc->data_segs_in += 1;
1288 /* Make sure we don't consume trailing bytes */
1289 if (PREDICT_FALSE (b->current_length > n_data_bytes))
1290 b->current_length = n_data_bytes;
1292 /* Handle out-of-order data */
1293 if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt))
1295 /* Old sequence numbers allowed through because they overlapped
1297 if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt))
1299 /* Completely in the past (possible retransmit). Ack
1300 * retransmissions since we may not have any data to send */
1301 if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
1303 tcp_program_dupack (tc);
1304 tc->errors.below_data_wnd++;
1305 error = TCP_ERROR_SEGMENT_OLD;
1309 /* Chop off the bytes in the past and see if what is left
1310 * can be enqueued in order */
1311 n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number;
1312 n_data_bytes -= n_bytes_to_drop;
1313 vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt;
1314 if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
1316 error = TCP_ERROR_SEGMENT_OLD;
1322 /* RFC2581: Enqueue and send DUPACK for fast retransmit */
1323 error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
1324 tcp_program_dupack (tc);
1325 TCP_EVT (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
1326 tc->errors.above_data_wnd += seq_gt (vnet_buffer (b)->tcp.seq_end,
1327 tc->rcv_las + tc->rcv_wnd);
1333 /* In order data, enqueue. Fifo figures out by itself if any out-of-order
1334 * segments can be enqueued after fifo tail offset changes. */
1335 error = tcp_session_enqueue_data (tc, b, n_data_bytes);
1336 tcp_program_ack (tc);
1344 tcp_header_t tcp_header;
1345 tcp_connection_t tcp_connection;
1349 format_tcp_rx_trace (u8 * s, va_list * args)
1351 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1352 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1353 tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
1354 tcp_connection_t *tc = &t->tcp_connection;
1355 u32 indent = format_get_indent (s);
1357 s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc,
1358 format_tcp_state, tc->state, format_white_space, indent,
1359 format_tcp_header, &t->tcp_header, 128);
1365 format_tcp_rx_trace_short (u8 * s, va_list * args)
1367 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1368 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1369 tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
1371 s = format (s, "%d -> %d (%U)",
1372 clib_net_to_host_u16 (t->tcp_header.dst_port),
1373 clib_net_to_host_u16 (t->tcp_header.src_port), format_tcp_state,
1374 t->tcp_connection.state);
1380 tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0,
1381 tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4)
1385 clib_memcpy_fast (&t0->tcp_connection, tc0,
1386 sizeof (t0->tcp_connection));
1390 th0 = tcp_buffer_hdr (b0);
1392 clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1396 tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
1397 vlib_frame_t * frame, u8 is_ip4)
1401 n_left = frame->n_vectors;
1402 from = vlib_frame_vector_args (frame);
1406 tcp_connection_t *tc0;
1413 b0 = vlib_get_buffer (vm, bi0);
1415 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1417 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1418 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1420 th0 = tcp_buffer_hdr (b0);
1421 tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4);
1430 tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
1431 u8 is_ip4, u32 evt, u32 val)
1434 vlib_node_increment_counter (vm, tcp4_node, evt, val);
1436 vlib_node_increment_counter (vm, tcp6_node, evt, val);
1439 #define tcp_maybe_inc_counter(node_id, err, count) \
1441 if (next0 != tcp_next_drop (is_ip4)) \
1442 tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
1443 tcp6_##node_id##_node.index, is_ip4, err, \
1446 #define tcp_inc_counter(node_id, err, count) \
1447 tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
1448 tcp6_##node_id##_node.index, is_ip4, \
1450 #define tcp_maybe_inc_err_counter(cnts, err) \
1452 cnts[err] += (next0 != tcp_next_drop (is_ip4)); \
1454 #define tcp_inc_err_counter(cnts, err, val) \
1458 #define tcp_store_err_counters(node_id, cnts) \
1461 for (i = 0; i < TCP_N_ERROR; i++) \
1463 tcp_inc_counter(node_id, i, cnts[i]); \
1468 tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1469 vlib_frame_t * frame, int is_ip4)
1471 u32 thread_index = vm->thread_index, errors = 0;
1472 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1473 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1474 u16 err_counters[TCP_N_ERROR] = { 0 };
1475 u32 n_left_from, *from;
1477 if (node->flags & VLIB_NODE_FLAG_TRACE)
1478 tcp_established_trace_frame (vm, node, frame, is_ip4);
1480 from = vlib_frame_vector_args (frame);
1481 n_left_from = frame->n_vectors;
1483 vlib_get_buffers (vm, from, bufs, n_left_from);
1486 while (n_left_from > 0)
1488 u32 error = TCP_ERROR_ACK_OK;
1489 tcp_connection_t *tc;
1492 if (n_left_from > 1)
1494 vlib_prefetch_buffer_header (b[1], LOAD);
1495 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1498 tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
1501 if (PREDICT_FALSE (tc == 0))
1503 error = TCP_ERROR_INVALID_CONNECTION;
1507 th = tcp_buffer_hdr (b[0]);
1509 /* TODO header prediction fast path */
1511 /* 1-4: check SEQ, RST, SYN */
1512 if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], th, &error)))
1514 TCP_EVT (TCP_EVT_SEG_INVALID, tc, vnet_buffer (b[0])->tcp);
1518 /* 5: check the ACK field */
1519 if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc, b[0], th, &error)))
1522 /* 6: check the URG bit TODO */
1524 /* 7: process the segment text */
1525 if (vnet_buffer (b[0])->tcp.data_len)
1526 error = tcp_segment_rcv (wrk, tc, b[0]);
1528 /* 8: check the FIN bit */
1529 if (PREDICT_FALSE (tcp_is_fin (th)))
1530 tcp_rcv_fin (wrk, tc, b[0], &error);
1533 tcp_inc_err_counter (err_counters, error, 1);
1539 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
1541 err_counters[TCP_ERROR_MSG_QUEUE_FULL] = errors;
1542 tcp_store_err_counters (established, err_counters);
1543 tcp_handle_postponed_dequeues (wrk);
1544 tcp_handle_disconnects (wrk);
1545 vlib_buffer_free (vm, from, frame->n_vectors);
1547 return frame->n_vectors;
1550 VLIB_NODE_FN (tcp4_established_node) (vlib_main_t * vm,
1551 vlib_node_runtime_t * node,
1552 vlib_frame_t * from_frame)
1554 return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1557 VLIB_NODE_FN (tcp6_established_node) (vlib_main_t * vm,
1558 vlib_node_runtime_t * node,
1559 vlib_frame_t * from_frame)
1561 return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1565 VLIB_REGISTER_NODE (tcp4_established_node) =
1567 .name = "tcp4-established",
1568 /* Takes a vector of packets. */
1569 .vector_size = sizeof (u32),
1570 .n_errors = TCP_N_ERROR,
1571 .error_counters = tcp_input_error_counters,
1572 .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
1575 #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n,
1576 foreach_tcp_state_next
1579 .format_trace = format_tcp_rx_trace_short,
1584 VLIB_REGISTER_NODE (tcp6_established_node) =
1586 .name = "tcp6-established",
1587 /* Takes a vector of packets. */
1588 .vector_size = sizeof (u32),
1589 .n_errors = TCP_N_ERROR,
1590 .error_counters = tcp_input_error_counters,
1591 .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
1594 #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n,
1595 foreach_tcp_state_next
1598 .format_trace = format_tcp_rx_trace_short,
1604 tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b,
1607 transport_connection_t *tmp = 0;
1614 if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN)
1617 u8 is_ip_valid = 0, val_l, val_r;
1619 if (tc->connection.is_ip4)
1621 ip4_header_t *ip4_hdr = (ip4_header_t *) vlib_buffer_get_current (b);
1623 val_l = !ip4_address_compare (&ip4_hdr->dst_address,
1624 &tc->connection.lcl_ip.ip4);
1625 val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1);
1626 val_r = !ip4_address_compare (&ip4_hdr->src_address,
1627 &tc->connection.rmt_ip.ip4);
1628 val_r = val_r || tc->state == TCP_STATE_LISTEN;
1629 is_ip_valid = val_l && val_r;
1633 ip6_header_t *ip6_hdr = (ip6_header_t *) vlib_buffer_get_current (b);
1635 val_l = !ip6_address_compare (&ip6_hdr->dst_address,
1636 &tc->connection.lcl_ip.ip6);
1637 val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0);
1638 val_r = !ip6_address_compare (&ip6_hdr->src_address,
1639 &tc->connection.rmt_ip.ip6);
1640 val_r = val_r || tc->state == TCP_STATE_LISTEN;
1641 is_ip_valid = val_l && val_r;
1644 u8 is_valid = (tc->c_lcl_port == hdr->dst_port
1645 && (tc->state == TCP_STATE_LISTEN
1646 || tc->c_rmt_port == hdr->src_port) && is_ip_valid);
1650 handle = session_lookup_half_open_handle (&tc->connection);
1651 tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF,
1652 tc->c_proto, tc->c_is_ip4);
1656 if (tmp->lcl_port == hdr->dst_port
1657 && tmp->rmt_port == hdr->src_port)
1659 TCP_DBG ("half-open is valid!");
1668 * Lookup transport connection
1670 static tcp_connection_t *
1671 tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
1675 transport_connection_t *tconn;
1676 tcp_connection_t *tc;
1681 ip4 = vlib_buffer_get_current (b);
1682 tcp = ip4_next_header (ip4);
1683 tconn = session_lookup_connection_wt4 (fib_index,
1688 TRANSPORT_PROTO_TCP,
1689 thread_index, &is_filtered);
1690 tc = tcp_get_connection_from_transport (tconn);
1691 ASSERT (tcp_lookup_is_valid (tc, b, tcp));
1696 ip6 = vlib_buffer_get_current (b);
1697 tcp = ip6_next_header (ip6);
1698 tconn = session_lookup_connection_wt6 (fib_index,
1703 TRANSPORT_PROTO_TCP,
1704 thread_index, &is_filtered);
1705 tc = tcp_get_connection_from_transport (tconn);
1706 ASSERT (tcp_lookup_is_valid (tc, b, tcp));
1711 static tcp_connection_t *
1712 tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4)
1718 ip4_header_t *ip4 = vlib_buffer_get_current (b);
1719 tcp_header_t *tcp = tcp_buffer_hdr (b);
1720 s = session_lookup_listener4 (fib_index,
1722 tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
1726 ip6_header_t *ip6 = vlib_buffer_get_current (b);
1727 tcp_header_t *tcp = tcp_buffer_hdr (b);
1728 s = session_lookup_listener6 (fib_index,
1730 tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
1733 if (PREDICT_TRUE (s != 0))
1734 return tcp_get_connection_from_transport (transport_get_listener
1735 (TRANSPORT_PROTO_TCP,
1736 s->connection_index));
1742 tcp46_syn_sent_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
1743 u32 *from, u32 n_bufs)
1745 tcp_connection_t *tc = 0;
1750 for (i = 0; i < n_bufs; i++)
1752 b = vlib_get_buffer (vm, from[i]);
1753 if (!(b->flags & VLIB_BUFFER_IS_TRACED))
1756 tcp_half_open_connection_get (vnet_buffer (b)->tcp.connection_index);
1757 t = vlib_add_trace (vm, node, b, sizeof (*t));
1758 tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
1763 tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4)
1765 vnet_main_t *vnm = vnet_get_main ();
1766 const dpo_id_t *dpo;
1767 const load_balance_t *lb;
1768 vnet_hw_interface_t *hw_if;
1769 u32 sw_if_idx, lb_idx;
1773 ip4_address_t *dst_addr = &(tc->c_rmt_ip.ip4);
1774 lb_idx = ip4_fib_forwarding_lookup (tc->c_fib_index, dst_addr);
1778 ip6_address_t *dst_addr = &(tc->c_rmt_ip.ip6);
1779 lb_idx = ip6_fib_table_fwding_lookup (tc->c_fib_index, dst_addr);
1782 lb = load_balance_get (lb_idx);
1783 if (PREDICT_FALSE (lb->lb_n_buckets > 1))
1785 dpo = load_balance_get_bucket_i (lb, 0);
1787 sw_if_idx = dpo_get_urpf (dpo);
1788 if (PREDICT_FALSE (sw_if_idx == ~0))
1791 hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx);
1792 if (hw_if->caps & VNET_HW_IF_CAP_TCP_GSO)
1793 tc->cfg_flags |= TCP_CFG_F_TSO;
1797 tcp46_syn_sent_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1798 vlib_frame_t *frame, int is_ip4)
1800 u32 n_left_from, *from, thread_index = vm->thread_index, errors = 0;
1801 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1802 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1804 from = vlib_frame_vector_args (frame);
1805 n_left_from = frame->n_vectors;
1807 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
1808 tcp46_syn_sent_trace_frame (vm, node, from, n_left_from);
1810 vlib_get_buffers (vm, from, bufs, n_left_from);
1813 while (n_left_from > 0)
1815 u32 ack, seq, error = TCP_ERROR_NONE;
1816 tcp_connection_t *tc, *new_tc;
1819 tc = tcp_half_open_connection_get (
1820 vnet_buffer (b[0])->tcp.connection_index);
1821 if (PREDICT_FALSE (tc == 0))
1823 error = TCP_ERROR_INVALID_CONNECTION;
1827 /* Half-open completed or cancelled recently but the connection
1828 * was't removed yet by the owning thread */
1829 if (PREDICT_FALSE (tc->flags & TCP_CONN_HALF_OPEN_DONE))
1831 error = TCP_ERROR_SPURIOUS_SYN_ACK;
1835 ack = vnet_buffer (b[0])->tcp.ack_number;
1836 seq = vnet_buffer (b[0])->tcp.seq_number;
1837 tcp = tcp_buffer_hdr (b[0]);
1839 /* Crude check to see if the connection handle does not match
1840 * the packet. Probably connection just switched to established */
1841 if (PREDICT_FALSE (tcp->dst_port != tc->c_lcl_port ||
1842 tcp->src_port != tc->c_rmt_port))
1844 error = TCP_ERROR_INVALID_CONNECTION;
1848 if (PREDICT_FALSE (!tcp_ack (tcp) && !tcp_rst (tcp) && !tcp_syn (tcp)))
1850 error = TCP_ERROR_SEGMENT_INVALID;
1854 /* SYNs consume sequence numbers */
1855 vnet_buffer (b[0])->tcp.seq_end += tcp_is_syn (tcp);
1858 * 1. check the ACK bit
1862 * If the ACK bit is set
1863 * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
1864 * the RST bit is set, if so drop the segment and return)
1865 * <SEQ=SEG.ACK><CTL=RST>
1866 * and discard the segment. Return.
1867 * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable.
1871 if (seq_leq (ack, tc->iss) || seq_gt (ack, tc->snd_nxt))
1874 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
1875 error = TCP_ERROR_RCV_WND;
1879 /* Make sure ACK is valid */
1880 if (seq_gt (tc->snd_una, ack))
1882 error = TCP_ERROR_ACK_INVALID;
1888 * 2. check the RST bit
1893 /* If ACK is acceptable, signal client that peer is not
1894 * willing to accept connection and drop connection*/
1896 tcp_rcv_rst (wrk, tc);
1897 error = TCP_ERROR_RST_RCVD;
1902 * 3. check the security and precedence (skipped)
1906 * 4. check the SYN bit
1909 /* No SYN flag. Drop. */
1912 error = TCP_ERROR_SEGMENT_INVALID;
1917 if (tcp_options_parse (tcp, &tc->rcv_opts, 1))
1919 error = TCP_ERROR_OPTIONS;
1923 /* Valid SYN or SYN-ACK. Move connection from half-open pool to
1924 * current thread pool. */
1925 new_tc = tcp_connection_alloc_w_base (thread_index, &tc);
1926 new_tc->rcv_nxt = vnet_buffer (b[0])->tcp.seq_end;
1928 new_tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1930 if (tcp_opts_tstamp (&new_tc->rcv_opts))
1932 new_tc->tsval_recent = new_tc->rcv_opts.tsval;
1933 new_tc->tsval_recent_age = tcp_time_tstamp (thread_index);
1936 if (tcp_opts_wscale (&new_tc->rcv_opts))
1937 new_tc->snd_wscale = new_tc->rcv_opts.wscale;
1939 new_tc->rcv_wscale = 0;
1941 new_tc->snd_wnd = clib_net_to_host_u16 (tcp->window)
1942 << new_tc->snd_wscale;
1943 new_tc->snd_wl1 = seq;
1944 new_tc->snd_wl2 = ack;
1946 tcp_connection_init_vars (new_tc);
1948 /* SYN-ACK: See if we can switch to ESTABLISHED state */
1949 if (PREDICT_TRUE (tcp_ack (tcp)))
1951 /* Our SYN is ACKed: we have iss < ack = snd_una */
1953 /* TODO Dequeue acknowledged segments if we support Fast Open */
1954 new_tc->snd_una = ack;
1955 new_tc->state = TCP_STATE_ESTABLISHED;
1957 /* Make sure las is initialized for the wnd computation */
1958 new_tc->rcv_las = new_tc->rcv_nxt;
1960 /* Notify app that we have connection. If session layer can't
1961 * allocate session send reset */
1962 if (session_stream_connect_notify (&new_tc->connection,
1965 tcp_send_reset_w_pkt (new_tc, b[0], thread_index, is_ip4);
1966 tcp_connection_cleanup (new_tc);
1967 error = TCP_ERROR_CREATE_SESSION_FAIL;
1971 transport_fifos_init_ooo (&new_tc->connection);
1972 new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection);
1973 /* Update rtt with the syn-ack sample */
1974 tcp_estimate_initial_rtt (new_tc);
1975 TCP_EVT (TCP_EVT_SYNACK_RCVD, new_tc);
1976 error = TCP_ERROR_SYN_ACKS_RCVD;
1978 /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
1981 new_tc->state = TCP_STATE_SYN_RCVD;
1983 /* Notify app that we have connection */
1984 if (session_stream_connect_notify (&new_tc->connection,
1987 tcp_connection_cleanup (new_tc);
1988 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
1989 TCP_EVT (TCP_EVT_RST_SENT, tc);
1990 error = TCP_ERROR_CREATE_SESSION_FAIL;
1994 transport_fifos_init_ooo (&new_tc->connection);
1995 new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection);
1997 tcp_init_snd_vars (new_tc);
1998 tcp_send_synack (new_tc);
1999 error = TCP_ERROR_SYNS_RCVD;
2003 if (!(new_tc->cfg_flags & TCP_CFG_F_NO_TSO))
2004 tcp_check_tx_offload (new_tc, is_ip4);
2006 /* Read data, if any */
2007 if (PREDICT_FALSE (vnet_buffer (b[0])->tcp.data_len))
2009 clib_warning ("rcvd data in syn-sent");
2010 error = tcp_segment_rcv (wrk, new_tc, b[0]);
2011 if (error == TCP_ERROR_ACK_OK)
2012 error = TCP_ERROR_SYN_ACKS_RCVD;
2016 /* Send ack now instead of programming it because connection was
2017 * just established and it's not optional. */
2018 tcp_send_ack (new_tc);
2023 /* If this is not the owning thread, wait for syn retransmit to
2024 * expire and cleanup then */
2025 if (tcp_half_open_connection_cleanup (tc))
2026 tc->flags |= TCP_CONN_HALF_OPEN_DONE;
2032 tcp_inc_counter (syn_sent, error, 1);
2036 session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, thread_index);
2037 tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors);
2038 vlib_buffer_free (vm, from, frame->n_vectors);
2039 tcp_handle_disconnects (wrk);
2041 return frame->n_vectors;
2044 VLIB_NODE_FN (tcp4_syn_sent_node) (vlib_main_t * vm,
2045 vlib_node_runtime_t * node,
2046 vlib_frame_t * from_frame)
2048 return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2051 VLIB_NODE_FN (tcp6_syn_sent_node) (vlib_main_t * vm,
2052 vlib_node_runtime_t * node,
2053 vlib_frame_t * from_frame)
2055 return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2059 VLIB_REGISTER_NODE (tcp4_syn_sent_node) =
2061 .name = "tcp4-syn-sent",
2062 /* Takes a vector of packets. */
2063 .vector_size = sizeof (u32),
2064 .n_errors = TCP_N_ERROR,
2065 .error_counters = tcp_input_error_counters,
2066 .n_next_nodes = TCP_SYN_SENT_N_NEXT,
2069 #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
2070 foreach_tcp_state_next
2073 .format_trace = format_tcp_rx_trace_short,
2078 VLIB_REGISTER_NODE (tcp6_syn_sent_node) =
2080 .name = "tcp6-syn-sent",
2081 /* Takes a vector of packets. */
2082 .vector_size = sizeof (u32),
2083 .n_errors = TCP_N_ERROR,
2084 .error_counters = tcp_input_error_counters,
2085 .n_next_nodes = TCP_SYN_SENT_N_NEXT,
2088 #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
2089 foreach_tcp_state_next
2092 .format_trace = format_tcp_rx_trace_short,
2097 tcp46_rcv_process_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
2098 u32 *from, u32 n_bufs)
2100 u32 thread_index = vm->thread_index;
2101 tcp_connection_t *tc = 0;
2106 for (i = 0; i < n_bufs; i++)
2108 b = vlib_get_buffer (vm, from[i]);
2109 if (!(b->flags & VLIB_BUFFER_IS_TRACED))
2111 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2113 t = vlib_add_trace (vm, node, b, sizeof (*t));
2114 tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
2119 * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED
2120 * as per RFC793 p. 64
2123 tcp46_rcv_process_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2124 vlib_frame_t *frame, int is_ip4)
2126 u32 thread_index = vm->thread_index, errors, n_left_from, *from, max_deq;
2127 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
2128 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2130 from = vlib_frame_vector_args (frame);
2131 n_left_from = frame->n_vectors;
2133 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2134 tcp46_rcv_process_trace_frame (vm, node, from, n_left_from);
2136 vlib_get_buffers (vm, from, bufs, n_left_from);
2139 while (n_left_from > 0)
2141 u32 error = TCP_ERROR_NONE;
2142 tcp_header_t *tcp = 0;
2143 tcp_connection_t *tc;
2146 tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2148 if (PREDICT_FALSE (tc == 0))
2150 error = TCP_ERROR_INVALID_CONNECTION;
2154 tcp = tcp_buffer_hdr (b[0]);
2155 is_fin = tcp_is_fin (tcp);
2159 if (!(tc->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
2161 tcp_connection_t *tmp;
2162 tmp = tcp_lookup_connection (tc->c_fib_index, b[0], thread_index,
2164 if (tmp->state != tc->state)
2166 if (tc->state != TCP_STATE_CLOSED)
2167 clib_warning ("state changed");
2174 * Special treatment for CLOSED
2176 if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED))
2178 error = TCP_ERROR_CONNECTION_CLOSED;
2183 * For all other states (except LISTEN)
2186 /* 1-4: check SEQ, RST, SYN */
2187 if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], tcp, &error)))
2190 /* 5: check the ACK field */
2193 case TCP_STATE_SYN_RCVD:
2195 /* Make sure the segment is exactly right */
2196 if (tc->rcv_nxt != vnet_buffer (b[0])->tcp.seq_number || is_fin)
2198 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
2199 error = TCP_ERROR_SEGMENT_INVALID;
2204 * If the segment acknowledgment is not acceptable, form a
2206 * <SEQ=SEG.ACK><CTL=RST>
2209 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2211 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
2212 error = TCP_ERROR_SEGMENT_INVALID;
2216 /* Update rtt and rto */
2217 tcp_estimate_initial_rtt (tc);
2218 tcp_connection_tx_pacer_update (tc);
2220 /* Switch state to ESTABLISHED */
2221 tc->state = TCP_STATE_ESTABLISHED;
2222 TCP_EVT (TCP_EVT_STATE_CHANGE, tc);
2224 if (!(tc->cfg_flags & TCP_CFG_F_NO_TSO))
2225 tcp_check_tx_offload (tc, is_ip4);
2227 /* Initialize session variables */
2228 tc->snd_una = vnet_buffer (b[0])->tcp.ack_number;
2229 tc->snd_wnd = clib_net_to_host_u16 (tcp->window)
2230 << tc->rcv_opts.wscale;
2231 tc->snd_wl1 = vnet_buffer (b[0])->tcp.seq_number;
2232 tc->snd_wl2 = vnet_buffer (b[0])->tcp.ack_number;
2234 /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
2235 tcp_retransmit_timer_reset (&wrk->timer_wheel, tc);
2236 if (session_stream_accept_notify (&tc->connection))
2238 error = TCP_ERROR_MSG_QUEUE_FULL;
2239 tcp_send_reset (tc);
2240 session_transport_delete_notify (&tc->connection);
2241 tcp_connection_cleanup (tc);
2244 error = TCP_ERROR_ACK_OK;
2246 case TCP_STATE_ESTABLISHED:
2247 /* We can get packets in established state here because they
2248 * were enqueued before state change */
2249 if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
2253 case TCP_STATE_FIN_WAIT_1:
2254 /* In addition to the processing for the ESTABLISHED state, if
2255 * our FIN is now acknowledged then enter FIN-WAIT-2 and
2256 * continue processing in that state. */
2257 if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
2260 /* Still have to send the FIN */
2261 if (tc->flags & TCP_CONN_FINPNDG)
2263 /* TX fifo finally drained */
2264 max_deq = transport_max_tx_dequeue (&tc->connection);
2265 if (max_deq <= tc->burst_acked)
2267 /* If a fin was received and data was acked extend wait */
2268 else if ((tc->flags & TCP_CONN_FINRCVD) && tc->bytes_acked)
2269 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2270 tcp_cfg.closewait_time);
2272 /* If FIN is ACKed */
2273 else if (tc->snd_una == tc->snd_nxt)
2275 /* Stop all retransmit timers because we have nothing more
2277 tcp_connection_timers_reset (tc);
2279 /* We already have a FIN but didn't transition to CLOSING
2280 * because of outstanding tx data. Close the connection. */
2281 if (tc->flags & TCP_CONN_FINRCVD)
2283 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
2284 session_transport_closed_notify (&tc->connection);
2285 tcp_program_cleanup (wrk, tc);
2289 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_2);
2290 /* Enable waitclose because we're willing to wait for peer's
2291 * FIN but not indefinitely. */
2292 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2293 tcp_cfg.finwait2_time);
2295 /* Don't try to deq the FIN acked */
2296 if (tc->burst_acked > 1)
2297 session_tx_fifo_dequeue_drop (&tc->connection,
2298 tc->burst_acked - 1);
2299 tc->burst_acked = 0;
2302 case TCP_STATE_FIN_WAIT_2:
2303 /* In addition to the processing for the ESTABLISHED state, if
2304 * the retransmission queue is empty, the user's CLOSE can be
2305 * acknowledged ("ok") but do not delete the TCB. */
2306 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2308 tc->burst_acked = 0;
2310 case TCP_STATE_CLOSE_WAIT:
2311 /* Do the same processing as for the ESTABLISHED state. */
2312 if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
2315 if (!(tc->flags & TCP_CONN_FINPNDG))
2318 /* Still have outstanding tx data */
2319 max_deq = transport_max_tx_dequeue (&tc->connection);
2320 if (max_deq > tc->burst_acked)
2324 tcp_connection_timers_reset (tc);
2325 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
2326 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2327 tcp_cfg.lastack_time);
2329 case TCP_STATE_CLOSING:
2330 /* In addition to the processing for the ESTABLISHED state, if
2331 * the ACK acknowledges our FIN then enter the TIME-WAIT state,
2332 * otherwise ignore the segment. */
2333 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2336 if (tc->snd_una != tc->snd_nxt)
2339 tcp_connection_timers_reset (tc);
2340 tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT);
2341 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2342 tcp_cfg.timewait_time);
2343 session_transport_closed_notify (&tc->connection);
2347 case TCP_STATE_LAST_ACK:
2348 /* The only thing that [should] arrive in this state is an
2349 * acknowledgment of our FIN. If our FIN is now acknowledged,
2350 * delete the TCB, enter the CLOSED state, and return. */
2352 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2355 /* Apparently our ACK for the peer's FIN was lost */
2356 if (is_fin && tc->snd_una != tc->snd_nxt)
2362 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
2363 session_transport_closed_notify (&tc->connection);
2365 /* Don't free the connection from the data path since
2366 * we can't ensure that we have no packets already enqueued
2367 * to output. Rely instead on the waitclose timer */
2368 tcp_connection_timers_reset (tc);
2369 tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
2374 case TCP_STATE_TIME_WAIT:
2375 /* The only thing that can arrive in this state is a
2376 * retransmission of the remote FIN. Acknowledge it, and restart
2377 * the 2 MSL timeout. */
2379 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2385 tcp_program_ack (tc);
2386 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2387 tcp_cfg.timewait_time);
2395 /* 6: check the URG bit TODO */
2397 /* 7: process the segment text */
2400 case TCP_STATE_ESTABLISHED:
2401 case TCP_STATE_FIN_WAIT_1:
2402 case TCP_STATE_FIN_WAIT_2:
2403 if (vnet_buffer (b[0])->tcp.data_len)
2404 error = tcp_segment_rcv (wrk, tc, b[0]);
2405 /* Don't accept out of order fins lower */
2406 if (vnet_buffer (b[0])->tcp.seq_end != tc->rcv_nxt)
2409 case TCP_STATE_CLOSE_WAIT:
2410 case TCP_STATE_CLOSING:
2411 case TCP_STATE_LAST_ACK:
2412 case TCP_STATE_TIME_WAIT:
2413 /* This should not occur, since a FIN has been received from the
2414 * remote side. Ignore the segment text. */
2418 /* 8: check the FIN bit */
2422 TCP_EVT (TCP_EVT_FIN_RCVD, tc);
2426 case TCP_STATE_ESTABLISHED:
2427 /* Account for the FIN and send ack */
2429 tcp_program_ack (tc);
2430 tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
2431 tcp_program_disconnect (wrk, tc);
2432 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2433 tcp_cfg.closewait_time);
2435 case TCP_STATE_SYN_RCVD:
2436 /* Send FIN-ACK, enter LAST-ACK and because the app was not
2437 * notified yet, set a cleanup timer instead of relying on
2438 * disconnect notify and the implicit close call. */
2439 tcp_connection_timers_reset (tc);
2442 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
2443 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2444 tcp_cfg.lastack_time);
2446 case TCP_STATE_CLOSE_WAIT:
2447 case TCP_STATE_CLOSING:
2448 case TCP_STATE_LAST_ACK:
2451 case TCP_STATE_FIN_WAIT_1:
2454 if (tc->flags & TCP_CONN_FINPNDG)
2456 /* If data is outstanding, stay in FIN_WAIT_1 and try to finish
2457 * sending it. Since we already received a fin, do not wait
2459 tc->flags |= TCP_CONN_FINRCVD;
2460 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2461 tcp_cfg.closewait_time);
2465 tcp_connection_set_state (tc, TCP_STATE_CLOSING);
2466 tcp_program_ack (tc);
2467 /* Wait for ACK for our FIN but not forever */
2468 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2469 tcp_cfg.closing_time);
2472 case TCP_STATE_FIN_WAIT_2:
2473 /* Got FIN, send ACK! Be more aggressive with resource cleanup */
2475 tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT);
2476 tcp_connection_timers_reset (tc);
2477 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2478 tcp_cfg.timewait_time);
2479 tcp_program_ack (tc);
2480 session_transport_closed_notify (&tc->connection);
2482 case TCP_STATE_TIME_WAIT:
2483 /* Remain in the TIME-WAIT state. Restart the time-wait
2486 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2487 tcp_cfg.timewait_time);
2490 error = TCP_ERROR_FIN_RCVD;
2496 tcp_inc_counter (rcv_process, error, 1);
2499 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
2501 tcp_inc_counter (rcv_process, TCP_ERROR_MSG_QUEUE_FULL, errors);
2502 tcp_handle_postponed_dequeues (wrk);
2503 tcp_handle_disconnects (wrk);
2504 vlib_buffer_free (vm, from, frame->n_vectors);
2506 return frame->n_vectors;
2509 VLIB_NODE_FN (tcp4_rcv_process_node) (vlib_main_t * vm,
2510 vlib_node_runtime_t * node,
2511 vlib_frame_t * from_frame)
2513 return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2516 VLIB_NODE_FN (tcp6_rcv_process_node) (vlib_main_t * vm,
2517 vlib_node_runtime_t * node,
2518 vlib_frame_t * from_frame)
2520 return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2524 VLIB_REGISTER_NODE (tcp4_rcv_process_node) =
2526 .name = "tcp4-rcv-process",
2527 /* Takes a vector of packets. */
2528 .vector_size = sizeof (u32),
2529 .n_errors = TCP_N_ERROR,
2530 .error_counters = tcp_input_error_counters,
2531 .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
2534 #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n,
2535 foreach_tcp_state_next
2538 .format_trace = format_tcp_rx_trace_short,
2543 VLIB_REGISTER_NODE (tcp6_rcv_process_node) =
2545 .name = "tcp6-rcv-process",
2546 /* Takes a vector of packets. */
2547 .vector_size = sizeof (u32),
2548 .n_errors = TCP_N_ERROR,
2549 .error_counters = tcp_input_error_counters,
2550 .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
2553 #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n,
2554 foreach_tcp_state_next
2557 .format_trace = format_tcp_rx_trace_short,
2562 tcp46_listen_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
2563 u32 *to_next, u32 n_bufs)
2565 tcp_connection_t *tc = 0;
2570 for (i = 0; i < n_bufs; i++)
2572 b = vlib_get_buffer (vm, to_next[i]);
2573 if (!(b->flags & VLIB_BUFFER_IS_TRACED))
2575 if (vnet_buffer (b)->tcp.flags == TCP_STATE_LISTEN)
2576 tc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index);
2577 t = vlib_add_trace (vm, node, b, sizeof (*t));
2578 tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
2583 * SYN received in TIME-WAIT state.
2586 * "When a connection is [...] on TIME-WAIT state [...]
2587 * [a TCP] MAY accept a new SYN from the remote TCP to
2588 * reopen the connection directly, if it:
2590 * (1) assigns its initial sequence number for the new
2591 * connection to be larger than the largest sequence
2592 * number it used on the previous connection incarnation,
2595 * (2) returns to TIME-WAIT state if the SYN turns out
2596 * to be an old duplicate".
2598 * The function returns true if the syn can be accepted during
2599 * connection time-wait (port reuse). In this case the function
2600 * also calculates what the iss should be for the new connection.
2603 syn_during_timewait (tcp_connection_t *tc, vlib_buffer_t *b, u32 *iss)
2605 int paws_reject = tcp_segment_check_paws (tc);
2609 /* Check that the SYN arrived out of window. We accept it */
2611 (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt) ||
2612 (tcp_opts_tstamp (&tc->rcv_opts) &&
2613 timestamp_lt (tc->tsval_recent, tc->rcv_opts.tsval))))
2615 /* Set the iss of the new connection to be the largest sequence number
2616 * the old peer would have accepted and add some random number
2618 tw_iss = tc->snd_nxt + tcp_available_snd_wnd (tc) +
2619 (uword) (tcp_time_now_us (tc->c_thread_index) * 1e6) % 65535;
2629 "ERROR not accepting SYN in timewait,paws_reject=%d, seq_num =%ld, "
2630 "rcv_nxt=%ld, tstamp_present=%d, tsval_recent = %d, tsval = %d\n",
2631 paws_reject, vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt,
2632 tcp_opts_tstamp (&tc->rcv_opts), tc->tsval_recent, tc->rcv_opts.tsval);
2638 * LISTEN state processing as per RFC 793 p. 65
2641 tcp46_listen_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2642 vlib_frame_t *frame, int is_ip4)
2644 u32 n_left_from, *from, n_syns = 0;
2645 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2646 u32 thread_index = vm->thread_index;
2649 from = vlib_frame_vector_args (frame);
2650 n_left_from = frame->n_vectors;
2652 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2653 tcp46_listen_trace_frame (vm, node, from, n_left_from);
2655 vlib_get_buffers (vm, from, bufs, n_left_from);
2658 while (n_left_from > 0)
2660 tcp_connection_t *lc, *child;
2662 /* Flags initialized with connection state after lookup */
2663 if (vnet_buffer (b[0])->tcp.flags == TCP_STATE_LISTEN)
2665 lc = tcp_listener_get (vnet_buffer (b[0])->tcp.connection_index);
2667 else /* We are in TimeWait state*/
2669 tcp_connection_t *tc;
2670 tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2672 if (tc->state != TCP_STATE_TIME_WAIT)
2674 tcp_inc_counter (listen, TCP_ERROR_CREATE_EXISTS, 1);
2678 if (PREDICT_FALSE (!syn_during_timewait (tc, b[0], &tw_iss)))
2680 /* This SYN can't be accepted */
2681 tcp_inc_counter (listen, TCP_ERROR_CREATE_EXISTS, 1);
2685 lc = tcp_lookup_listener (b[0], tc->c_fib_index, is_ip4);
2686 /* clean up the old session */
2687 tcp_connection_del (tc);
2688 /* listener was cleaned up */
2691 tcp_inc_counter (listen, TCP_ERROR_NO_LISTENER, 1);
2696 /* Make sure connection wasn't just created */
2698 tcp_lookup_connection (lc->c_fib_index, b[0], thread_index, is_ip4);
2699 if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN))
2701 tcp_inc_counter (listen, TCP_ERROR_CREATE_EXISTS, 1);
2705 /* Create child session. For syn-flood protection use filter */
2707 /* 1. first check for an RST: handled by input dispatch */
2709 /* 2. second check for an ACK: handled by input dispatch */
2711 /* 3. check for a SYN (did that already) */
2713 /* Create child session and send SYN-ACK */
2714 child = tcp_connection_alloc (thread_index);
2716 if (tcp_options_parse (tcp_buffer_hdr (b[0]), &child->rcv_opts, 1))
2718 tcp_inc_counter (listen, TCP_ERROR_OPTIONS, 1);
2719 tcp_connection_free (child);
2723 tcp_init_w_buffer (child, b[0], is_ip4);
2725 child->state = TCP_STATE_SYN_RCVD;
2726 child->c_fib_index = lc->c_fib_index;
2727 child->cc_algo = lc->cc_algo;
2729 /* In the regular case, the tw_iss will be zero, but
2730 * in the special case of syn arriving in time_wait state, the value
2731 * will be set according to rfc 1122
2733 child->iss = tw_iss;
2734 tcp_connection_init_vars (child);
2735 child->rto = TCP_RTO_MIN;
2738 * This initializes elog track, must be done before synack.
2739 * We also do it before possible tcp_connection_cleanup() as it
2740 * generates TCP_EVT_DELETE event.
2742 TCP_EVT (TCP_EVT_SYN_RCVD, child, 1);
2744 if (session_stream_accept (&child->connection, lc->c_s_index,
2745 lc->c_thread_index, 0 /* notify */ ))
2747 tcp_connection_cleanup (child);
2748 tcp_inc_counter (listen, TCP_ERROR_CREATE_SESSION_FAIL, 1);
2752 transport_fifos_init_ooo (&child->connection);
2753 child->tx_fifo_size = transport_tx_fifo_size (&child->connection);
2755 tcp_send_synack (child);
2763 tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns);
2764 vlib_buffer_free (vm, from, frame->n_vectors);
2766 return frame->n_vectors;
2769 VLIB_NODE_FN (tcp4_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2770 vlib_frame_t * from_frame)
2772 return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2775 VLIB_NODE_FN (tcp6_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2776 vlib_frame_t * from_frame)
2778 return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2782 VLIB_REGISTER_NODE (tcp4_listen_node) =
2784 .name = "tcp4-listen",
2785 /* Takes a vector of packets. */
2786 .vector_size = sizeof (u32),
2787 .n_errors = TCP_N_ERROR,
2788 .error_counters = tcp_input_error_counters,
2789 .n_next_nodes = TCP_LISTEN_N_NEXT,
2792 #define _(s,n) [TCP_LISTEN_NEXT_##s] = n,
2793 foreach_tcp_state_next
2796 .format_trace = format_tcp_rx_trace_short,
2801 VLIB_REGISTER_NODE (tcp6_listen_node) =
2803 .name = "tcp6-listen",
2804 /* Takes a vector of packets. */
2805 .vector_size = sizeof (u32),
2806 .n_errors = TCP_N_ERROR,
2807 .error_counters = tcp_input_error_counters,
2808 .n_next_nodes = TCP_LISTEN_N_NEXT,
2811 #define _(s,n) [TCP_LISTEN_NEXT_##s] = n,
2812 foreach_tcp_state_next
2815 .format_trace = format_tcp_rx_trace_short,
2819 typedef enum _tcp_input_next
2821 TCP_INPUT_NEXT_DROP,
2822 TCP_INPUT_NEXT_LISTEN,
2823 TCP_INPUT_NEXT_RCV_PROCESS,
2824 TCP_INPUT_NEXT_SYN_SENT,
2825 TCP_INPUT_NEXT_ESTABLISHED,
2826 TCP_INPUT_NEXT_RESET,
2827 TCP_INPUT_NEXT_PUNT,
2831 #define foreach_tcp4_input_next \
2832 _ (DROP, "ip4-drop") \
2833 _ (LISTEN, "tcp4-listen") \
2834 _ (RCV_PROCESS, "tcp4-rcv-process") \
2835 _ (SYN_SENT, "tcp4-syn-sent") \
2836 _ (ESTABLISHED, "tcp4-established") \
2837 _ (RESET, "tcp4-reset") \
2838 _ (PUNT, "ip4-punt")
2840 #define foreach_tcp6_input_next \
2841 _ (DROP, "ip6-drop") \
2842 _ (LISTEN, "tcp6-listen") \
2843 _ (RCV_PROCESS, "tcp6-rcv-process") \
2844 _ (SYN_SENT, "tcp6-syn-sent") \
2845 _ (ESTABLISHED, "tcp6-established") \
2846 _ (RESET, "tcp6-reset") \
2847 _ (PUNT, "ip6-punt")
2849 #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)
2852 tcp_input_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2853 vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4)
2855 tcp_connection_t *tc;
2860 for (i = 0; i < n_bufs; i++)
2862 if (bs[i]->flags & VLIB_BUFFER_IS_TRACED)
2864 t = vlib_add_trace (vm, node, bs[i], sizeof (*t));
2865 tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index,
2867 tcp = vlib_buffer_get_current (bs[i]);
2868 tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4);
2874 tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4)
2876 if (*error == TCP_ERROR_FILTERED || *error == TCP_ERROR_WRONG_THREAD)
2878 *next = TCP_INPUT_NEXT_DROP;
2880 else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6))
2882 *next = TCP_INPUT_NEXT_PUNT;
2883 *error = TCP_ERROR_PUNT;
2887 *next = TCP_INPUT_NEXT_RESET;
2888 *error = TCP_ERROR_NO_LISTENER;
2893 tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc,
2894 vlib_buffer_t * b, u16 * next,
2895 vlib_node_runtime_t * error_node)
2901 tcp = tcp_buffer_hdr (b);
2902 flags = tcp->flags & filter_flags;
2903 *next = tm->dispatch_table[tc->state][flags].next;
2904 error = tm->dispatch_table[tc->state][flags].error;
2907 /* Track connection state when packet was received. It is required
2908 * for @ref tcp46_listen_inline to detect whether we reached
2909 * the node as a result of a SYN packet received while in time-wait
2910 * state. In this case the connection_index in vnet buffer will point
2911 * to the existing tcp connection and not the listener
2913 vnet_buffer (b)->tcp.flags = tc->state;
2915 if (PREDICT_FALSE (error != TCP_ERROR_NONE))
2917 b->error = error_node->errors[error];
2918 if (error == TCP_ERROR_DISPATCH)
2919 clib_warning ("tcp conn %u disp error state %U flags %U",
2920 tc->c_c_index, format_tcp_state, tc->state,
2921 format_tcp_flags, (int) flags);
2926 tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2927 vlib_frame_t * frame, int is_ip4, u8 is_nolookup)
2929 u32 n_left_from, *from, thread_index = vm->thread_index;
2930 tcp_main_t *tm = vnet_get_tcp_main ();
2931 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2932 u16 nexts[VLIB_FRAME_SIZE], *next;
2934 tcp_update_time_now (tcp_get_worker (thread_index));
2936 from = vlib_frame_vector_args (frame);
2937 n_left_from = frame->n_vectors;
2938 vlib_get_buffers (vm, from, bufs, n_left_from);
2943 while (n_left_from >= 4)
2945 u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER;
2946 tcp_connection_t *tc0, *tc1;
2949 vlib_prefetch_buffer_header (b[2], STORE);
2950 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2952 vlib_prefetch_buffer_header (b[3], STORE);
2953 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2956 next[0] = next[1] = TCP_INPUT_NEXT_DROP;
2958 tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
2960 tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4,
2963 if (PREDICT_TRUE (!tc0 + !tc1 == 0))
2965 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2966 ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1])));
2968 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2969 vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
2971 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2972 tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
2976 if (PREDICT_TRUE (tc0 != 0))
2978 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2979 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2980 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2984 tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
2985 b[0]->error = node->errors[error0];
2988 if (PREDICT_TRUE (tc1 != 0))
2990 ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1])));
2991 vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
2992 tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
2996 tcp_input_set_error_next (tm, &next[1], &error1, is_ip4);
2997 b[1]->error = node->errors[error1];
3005 while (n_left_from > 0)
3007 tcp_connection_t *tc0;
3008 u32 error0 = TCP_ERROR_NO_LISTENER;
3010 if (n_left_from > 1)
3012 vlib_prefetch_buffer_header (b[1], STORE);
3013 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
3016 next[0] = TCP_INPUT_NEXT_DROP;
3017 tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
3019 if (PREDICT_TRUE (tc0 != 0))
3021 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
3022 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
3023 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
3027 tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
3028 b[0]->error = node->errors[error0];
3036 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
3037 tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4);
3039 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
3040 return frame->n_vectors;
3043 VLIB_NODE_FN (tcp4_input_nolookup_node) (vlib_main_t * vm,
3044 vlib_node_runtime_t * node,
3045 vlib_frame_t * from_frame)
3047 return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
3048 1 /* is_nolookup */ );
3051 VLIB_NODE_FN (tcp6_input_nolookup_node) (vlib_main_t * vm,
3052 vlib_node_runtime_t * node,
3053 vlib_frame_t * from_frame)
3055 return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
3056 1 /* is_nolookup */ );
3060 VLIB_REGISTER_NODE (tcp4_input_nolookup_node) =
3062 .name = "tcp4-input-nolookup",
3063 /* Takes a vector of packets. */
3064 .vector_size = sizeof (u32),
3065 .n_errors = TCP_N_ERROR,
3066 .error_counters = tcp_input_error_counters,
3067 .n_next_nodes = TCP_INPUT_N_NEXT,
3070 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3071 foreach_tcp4_input_next
3074 .format_buffer = format_tcp_header,
3075 .format_trace = format_tcp_rx_trace,
3080 VLIB_REGISTER_NODE (tcp6_input_nolookup_node) =
3082 .name = "tcp6-input-nolookup",
3083 /* Takes a vector of packets. */
3084 .vector_size = sizeof (u32),
3085 .n_errors = TCP_N_ERROR,
3086 .error_counters = tcp_input_error_counters,
3087 .n_next_nodes = TCP_INPUT_N_NEXT,
3090 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3091 foreach_tcp6_input_next
3094 .format_buffer = format_tcp_header,
3095 .format_trace = format_tcp_rx_trace,
3099 VLIB_NODE_FN (tcp4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
3100 vlib_frame_t * from_frame)
3102 return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
3103 0 /* is_nolookup */ );
3106 VLIB_NODE_FN (tcp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
3107 vlib_frame_t * from_frame)
3109 return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
3110 0 /* is_nolookup */ );
3114 VLIB_REGISTER_NODE (tcp4_input_node) =
3116 .name = "tcp4-input",
3117 /* Takes a vector of packets. */
3118 .vector_size = sizeof (u32),
3119 .n_errors = TCP_N_ERROR,
3120 .error_counters = tcp_input_error_counters,
3121 .n_next_nodes = TCP_INPUT_N_NEXT,
3124 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3125 foreach_tcp4_input_next
3128 .format_buffer = format_tcp_header,
3129 .format_trace = format_tcp_rx_trace,
3134 VLIB_REGISTER_NODE (tcp6_input_node) =
3136 .name = "tcp6-input",
3137 /* Takes a vector of packets. */
3138 .vector_size = sizeof (u32),
3139 .n_errors = TCP_N_ERROR,
3140 .error_counters = tcp_input_error_counters,
3141 .n_next_nodes = TCP_INPUT_N_NEXT,
3144 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3145 foreach_tcp6_input_next
3148 .format_buffer = format_tcp_header,
3149 .format_trace = format_tcp_rx_trace,
3153 #ifndef CLIB_MARCH_VARIANT
3155 tcp_check_gso (tcp_connection_t *tc)
3157 tcp_check_tx_offload (tc, tc->c_is_ip4);
3161 tcp_dispatch_table_init (tcp_main_t * tm)
3164 for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
3165 for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
3167 tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP;
3168 tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH;
3171 #define _(t,f,n,e) \
3173 tm->dispatch_table[TCP_STATE_##t][f].next = (n); \
3174 tm->dispatch_table[TCP_STATE_##t][f].error = (e); \
3177 /* RFC 793: In LISTEN if RST drop and if ACK return RST */
3178 _(LISTEN, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3179 _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_ACK_INVALID);
3180 _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_INVALID_CONNECTION);
3181 _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
3182 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3183 TCP_ERROR_ACK_INVALID);
3184 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3185 TCP_ERROR_SEGMENT_INVALID);
3186 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3187 TCP_ERROR_SEGMENT_INVALID);
3188 _(LISTEN, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3189 TCP_ERROR_INVALID_CONNECTION);
3190 _(LISTEN, TCP_FLAG_FIN, TCP_INPUT_NEXT_RESET, TCP_ERROR_SEGMENT_INVALID);
3191 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3192 TCP_ERROR_SEGMENT_INVALID);
3193 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3194 TCP_ERROR_SEGMENT_INVALID);
3195 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3196 TCP_ERROR_SEGMENT_INVALID);
3197 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP,
3198 TCP_ERROR_SEGMENT_INVALID);
3199 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3200 TCP_ERROR_SEGMENT_INVALID);
3201 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3202 TCP_ERROR_SEGMENT_INVALID);
3203 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3204 TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3205 /* ACK for for a SYN-ACK -> tcp-rcv-process. */
3206 _(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3207 _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3208 _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3210 _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3211 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3213 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3215 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3216 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3217 _(SYN_RCVD, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3218 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3220 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3222 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3223 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3224 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3226 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3227 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3228 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3229 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3230 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3231 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3232 _(SYN_RCVD, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3233 /* SYN-ACK for a SYN */
3234 _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3236 _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3237 _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3238 _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3240 _(SYN_SENT, TCP_FLAG_FIN, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3241 _(SYN_SENT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3243 /* ACK for for established connection -> tcp-established. */
3244 _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3245 /* FIN for for established connection -> tcp-established. */
3246 _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3247 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3249 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
3251 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3252 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3253 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED,
3255 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3256 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3257 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3258 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3259 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3260 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3261 _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3262 _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3264 _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3265 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3267 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
3269 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3270 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3271 _(ESTABLISHED, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3272 /* ACK or FIN-ACK to our FIN */
3273 _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3274 _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS,
3276 /* FIN in reply to our FIN from the other side */
3277 _(FIN_WAIT_1, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3278 _(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3279 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3281 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3282 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3283 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3284 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3285 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3286 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3287 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3289 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3290 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3291 _(FIN_WAIT_1, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3292 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3294 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3296 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3297 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3298 _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3299 _(FIN_WAIT_1, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3301 _(CLOSING, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3302 _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3303 _(CLOSING, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3304 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3306 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3308 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3309 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3310 _(CLOSING, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3311 _(CLOSING, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3313 _(CLOSING, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3314 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3316 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3318 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3319 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3320 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3322 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3323 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3324 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3325 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3326 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3327 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3328 /* FIN confirming that the peer (app) has closed */
3329 _(FIN_WAIT_2, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3330 _(FIN_WAIT_2, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3331 _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3333 _(FIN_WAIT_2, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3334 _(FIN_WAIT_2, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3336 _(FIN_WAIT_2, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3337 _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3338 _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3340 _(CLOSE_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3341 _(CLOSE_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3343 _(CLOSE_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3344 _(LAST_ACK, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3345 _(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3346 _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3347 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3349 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3351 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3352 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3353 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3355 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3356 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3357 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3358 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3359 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3360 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3361 _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3362 _(LAST_ACK, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3364 _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3365 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3367 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3369 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3370 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3371 _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
3372 _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3373 _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3375 _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3376 _(TIME_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3378 _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3379 /* RFC793 CLOSED: An incoming segment containing a RST is discarded. An
3380 * incoming segment not containing a RST causes a RST to be sent in
3382 _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
3383 _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3384 TCP_ERROR_CONNECTION_CLOSED);
3385 _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
3386 _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
3387 _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3388 TCP_ERROR_CONNECTION_CLOSED);
3392 static clib_error_t *
3393 tcp_input_init (vlib_main_t * vm)
3395 clib_error_t *error = 0;
3396 tcp_main_t *tm = vnet_get_tcp_main ();
3398 if ((error = vlib_call_init_function (vm, tcp_init)))
3401 /* Initialize dispatch table. */
3402 tcp_dispatch_table_init (tm);
3407 VLIB_INIT_FUNCTION (tcp_input_init);
3409 #endif /* CLIB_MARCH_VARIANT */
3412 * fd.io coding-style-patch-verification: ON
3415 * eval: (c-set-style "gnu")