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_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 /* Set persist timer if not set and we just got 0 wnd */
633 if (!tcp_timer_is_active (tc, TCP_TIMER_PERSIST)
634 && !tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))
636 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
637 tcp_persist_timer_set (&wrk->timer_wheel, tc);
642 if (PREDICT_FALSE (tcp_timer_is_active (tc, TCP_TIMER_PERSIST)))
644 tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
645 tcp_persist_timer_reset (&wrk->timer_wheel, tc);
648 if (PREDICT_FALSE (tcp_is_descheduled (tc)))
651 if (PREDICT_FALSE (!tcp_in_recovery (tc) && tc->rto_boff > 0))
661 * Init loss recovery/fast recovery.
663 * Triggered by dup acks as opposed to timer timeout. Note that cwnd is
664 * updated in @ref tcp_cc_handle_event after fast retransmit
667 tcp_cc_init_congestion (tcp_connection_t * tc)
669 tcp_fastrecovery_on (tc);
670 tc->snd_congestion = tc->snd_nxt;
671 tc->cwnd_acc_bytes = 0;
672 tc->snd_rxt_bytes = 0;
673 tc->rxt_delivered = 0;
674 tc->prr_delivered = 0;
675 tc->prr_start = tc->snd_una;
676 tc->prev_ssthresh = tc->ssthresh;
677 tc->prev_cwnd = tc->cwnd;
679 tc->snd_rxt_ts = tcp_tstamp (tc);
680 tcp_cc_congestion (tc);
682 /* Post retransmit update cwnd to ssthresh and account for the
683 * three segments that have left the network and should've been
684 * buffered at the receiver XXX */
685 if (!tcp_opts_sack_permitted (&tc->rcv_opts))
686 tc->cwnd += TCP_DUPACK_THRESHOLD * tc->snd_mss;
688 tc->fr_occurences += 1;
689 TCP_EVT (TCP_EVT_CC_EVT, tc, 4);
693 tcp_cc_congestion_undo (tcp_connection_t * tc)
695 tc->cwnd = tc->prev_cwnd;
696 tc->ssthresh = tc->prev_ssthresh;
697 tcp_cc_undo_recovery (tc);
698 ASSERT (tc->rto_boff == 0);
699 TCP_EVT (TCP_EVT_CC_EVT, tc, 5);
703 tcp_cc_is_spurious_timeout_rxt (tcp_connection_t * tc)
705 return (tcp_in_recovery (tc) && tc->rto_boff == 1
707 && tcp_opts_tstamp (&tc->rcv_opts)
708 && timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts));
712 tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
714 return (tcp_cc_is_spurious_timeout_rxt (tc));
718 tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack)
722 /* If of of the two conditions lower hold, reset dupacks because
723 * we're probably after timeout (RFC6582 heuristics).
724 * If Cumulative ack does not cover more than congestion threshold,
726 * 1) The following doesn't hold: The congestion window is greater
727 * than SMSS bytes and the difference between highest_ack
728 * and prev_highest_ack is at most 4*SMSS bytes
729 * 2) Echoed timestamp in the last non-dup ack does not equal the
732 if (seq_leq (tc->snd_una, tc->snd_congestion)
733 && ((!(tc->cwnd > tc->snd_mss
734 && tc->bytes_acked <= 4 * tc->snd_mss))
735 || (tc->rcv_opts.tsecr != tc->tsecr_last_ack)))
741 return tc->sack_sb.lost_bytes || tc->rcv_dupacks >= tc->sack_sb.reorder;
745 tcp_cc_try_recover (tcp_connection_t *tc)
747 sack_scoreboard_hole_t *hole;
750 ASSERT (tcp_in_cong_recovery (tc));
752 if (tcp_cc_is_spurious_retransmit (tc))
754 tcp_cc_congestion_undo (tc);
758 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
761 /* Previous recovery left us congested. Continue sending as part
762 * of the current recovery event with an updated snd_congestion */
763 if (tc->sack_sb.sacked_bytes)
765 tc->snd_congestion = tc->snd_nxt;
769 tc->rxt_delivered = 0;
770 tc->snd_rxt_bytes = 0;
772 tc->prr_delivered = 0;
774 tc->flags &= ~TCP_CONN_RXT_PENDING;
776 hole = scoreboard_first_hole (&tc->sack_sb);
777 if (hole && hole->start == tc->snd_una && hole->end == tc->snd_nxt)
778 scoreboard_clear (&tc->sack_sb);
780 if (!tcp_in_recovery (tc) && !is_spurious)
781 tcp_cc_recovered (tc);
783 tcp_fastrecovery_off (tc);
784 tcp_fastrecovery_first_off (tc);
785 tcp_recovery_off (tc);
786 TCP_EVT (TCP_EVT_CC_EVT, tc, 3);
788 ASSERT (tc->rto_boff == 0);
789 ASSERT (!tcp_in_cong_recovery (tc));
790 ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
796 tcp_cc_update (tcp_connection_t * tc, tcp_rate_sample_t * rs)
798 ASSERT (!tcp_in_cong_recovery (tc) || tcp_is_lost_fin (tc));
800 /* Congestion avoidance */
801 tcp_cc_rcv_ack (tc, rs);
803 /* If a cumulative ack, make sure dupacks is 0 */
806 /* When dupacks hits the threshold we only enter fast retransmit if
807 * cumulative ack covers more than snd_congestion. Should snd_una
808 * wrap this test may fail under otherwise valid circumstances.
809 * Therefore, proactively update snd_congestion when wrap detected. */
811 (seq_leq (tc->snd_congestion, tc->snd_una - tc->bytes_acked)
812 && seq_gt (tc->snd_congestion, tc->snd_una)))
813 tc->snd_congestion = tc->snd_una - 1;
817 * One function to rule them all ... and in the darkness bind them
820 tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
823 u8 has_sack = tcp_opts_sack_permitted (&tc->rcv_opts);
825 /* If reneging, wait for timer based retransmits */
826 if (PREDICT_FALSE (tcp_is_lost_fin (tc) || tc->sack_sb.is_reneging))
830 * If not in recovery, figure out if we should enter
832 if (!tcp_in_cong_recovery (tc))
837 TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
838 tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
840 if (tcp_should_fastrecover (tc, has_sack))
842 tcp_cc_init_congestion (tc);
845 scoreboard_init_rxt (&tc->sack_sb, tc->snd_una);
847 tcp_connection_tx_pacer_reset (tc, tc->cwnd, 0 /* start bucket */ );
848 tcp_program_retransmit (tc);
855 * Already in recovery
859 * See if we can exit and stop retransmitting
861 if (seq_geq (tc->snd_una, tc->snd_congestion))
863 /* If successfully recovered, treat ack as congestion avoidance ack
864 * and return. Otherwise, we're still congested so process feedback */
865 if (!tcp_cc_try_recover (tc))
867 tcp_cc_rcv_ack (tc, rs);
873 * Process (re)transmit feedback. Output path uses this to decide how much
874 * more data to release into the network
878 if (!tc->bytes_acked && tc->sack_sb.rxt_sacked)
879 tcp_fastrecovery_first_on (tc);
881 tc->rxt_delivered += tc->sack_sb.rxt_sacked;
882 tc->prr_delivered += rs->delivered;
888 tc->rcv_dupacks += 1;
889 TCP_EVT (TCP_EVT_DUPACK_RCVD, tc, 1);
891 tc->rxt_delivered = clib_min (tc->rxt_delivered + tc->bytes_acked,
894 tc->prr_delivered += clib_min (tc->snd_mss,
895 tc->snd_nxt - tc->snd_una);
897 tc->prr_delivered += tc->bytes_acked - clib_min (tc->bytes_acked,
901 /* If partial ack, assume that the first un-acked segment was lost */
902 if (tc->bytes_acked || tc->rcv_dupacks == TCP_DUPACK_THRESHOLD)
903 tcp_fastrecovery_first_on (tc);
906 tcp_program_retransmit (tc);
909 * Notify cc of the event
912 if (!tc->bytes_acked)
914 tcp_cc_rcv_cong_ack (tc, TCP_CC_DUPACK, rs);
918 /* RFC6675: If the incoming ACK is a cumulative acknowledgment,
919 * reset dupacks to 0. Also needed if in congestion recovery */
922 if (tcp_in_recovery (tc))
923 tcp_cc_rcv_ack (tc, rs);
925 tcp_cc_rcv_cong_ack (tc, TCP_CC_PARTIALACK, rs);
929 tcp_handle_old_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs)
931 if (!tcp_in_cong_recovery (tc))
934 if (tcp_opts_sack_permitted (&tc->rcv_opts))
935 tcp_rcv_sacks (tc, tc->snd_una);
939 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
940 tcp_bt_sample_delivery_rate (tc, rs);
942 tcp_cc_handle_event (tc, rs, 1);
946 * Check if duplicate ack as per RFC5681 Sec. 2
949 tcp_ack_is_dupack (tcp_connection_t * tc, vlib_buffer_t * b, u32 prev_snd_wnd,
952 return ((vnet_buffer (b)->tcp.ack_number == prev_snd_una)
953 && seq_gt (tc->snd_nxt, tc->snd_una)
954 && (vnet_buffer (b)->tcp.seq_end == vnet_buffer (b)->tcp.seq_number)
955 && (prev_snd_wnd == tc->snd_wnd));
959 * Checks if ack is a congestion control event.
962 tcp_ack_is_cc_event (tcp_connection_t * tc, vlib_buffer_t * b,
963 u32 prev_snd_wnd, u32 prev_snd_una, u8 * is_dack)
965 /* Check if ack is duplicate. Per RFC 6675, ACKs that SACK new data are
966 * defined to be 'duplicate' as well */
967 *is_dack = tc->sack_sb.last_sacked_bytes
968 || tcp_ack_is_dupack (tc, b, prev_snd_wnd, prev_snd_una);
970 return (*is_dack || tcp_in_cong_recovery (tc));
974 * Process incoming ACK
977 tcp_rcv_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
978 tcp_header_t * th, u32 * error)
980 u32 prev_snd_wnd, prev_snd_una;
981 tcp_rate_sample_t rs = { 0 };
984 TCP_EVT (TCP_EVT_CC_STAT, tc);
986 /* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */
987 if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
989 /* We've probably entered recovery and the peer still has some
990 * of the data we've sent. Update snd_nxt and accept the ack */
991 if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
992 && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
994 tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
998 tc->errors.above_ack_wnd += 1;
999 *error = TCP_ERROR_ACK_FUTURE;
1000 TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 0, vnet_buffer (b)->tcp.ack_number);
1004 /* If old ACK, probably it's an old dupack */
1005 if (PREDICT_FALSE (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una)))
1007 tc->errors.below_ack_wnd += 1;
1008 *error = TCP_ERROR_ACK_OLD;
1009 TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 1, vnet_buffer (b)->tcp.ack_number);
1011 if (seq_lt (vnet_buffer (b)->tcp.ack_number, tc->snd_una - tc->rcv_wnd))
1014 tcp_handle_old_ack (tc, &rs);
1016 /* Don't drop yet */
1023 * Looks okay, process feedback
1026 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1027 tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number);
1029 prev_snd_wnd = tc->snd_wnd;
1030 prev_snd_una = tc->snd_una;
1031 tcp_update_snd_wnd (tc, vnet_buffer (b)->tcp.seq_number,
1032 vnet_buffer (b)->tcp.ack_number,
1033 clib_net_to_host_u16 (th->window) << tc->snd_wscale);
1034 tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
1035 tc->snd_una = vnet_buffer (b)->tcp.ack_number;
1036 tcp_validate_txf_size (tc, tc->bytes_acked);
1038 if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE)
1039 tcp_bt_sample_delivery_rate (tc, &rs);
1041 rs.delivered = tc->bytes_acked + tc->sack_sb.last_sacked_bytes -
1042 tc->sack_sb.last_bytes_delivered;
1044 if (tc->bytes_acked + tc->sack_sb.last_sacked_bytes)
1046 tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number);
1047 if (tc->bytes_acked)
1048 tcp_program_dequeue (wrk, tc);
1051 TCP_EVT (TCP_EVT_ACK_RCVD, tc);
1054 * Check if we have congestion event
1057 if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack))
1059 tcp_cc_handle_event (tc, &rs, is_dack);
1060 tc->dupacks_in += is_dack;
1061 if (!tcp_in_cong_recovery (tc))
1063 *error = TCP_ERROR_ACK_OK;
1066 *error = TCP_ERROR_ACK_DUP;
1067 if (vnet_buffer (b)->tcp.data_len || tcp_is_fin (th))
1073 * Update congestion control (slow start/congestion avoidance)
1075 tcp_cc_update (tc, &rs);
1076 *error = TCP_ERROR_ACK_OK;
1081 tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
1083 if (!tcp_disconnect_pending (tc))
1085 vec_add1 (wrk->pending_disconnects, tc->c_c_index);
1086 tcp_disconnect_pending_on (tc);
1091 tcp_handle_disconnects (tcp_worker_ctx_t * wrk)
1093 u32 thread_index, *pending_disconnects, *pending_resets;
1094 tcp_connection_t *tc;
1097 if (vec_len (wrk->pending_disconnects))
1099 thread_index = wrk->vm->thread_index;
1100 pending_disconnects = wrk->pending_disconnects;
1101 for (i = 0; i < vec_len (pending_disconnects); i++)
1103 tc = tcp_connection_get (pending_disconnects[i], thread_index);
1104 tcp_disconnect_pending_off (tc);
1105 session_transport_closing_notify (&tc->connection);
1107 _vec_len (wrk->pending_disconnects) = 0;
1110 if (vec_len (wrk->pending_resets))
1112 thread_index = wrk->vm->thread_index;
1113 pending_resets = wrk->pending_resets;
1114 for (i = 0; i < vec_len (pending_resets); i++)
1116 tc = tcp_connection_get (pending_resets[i], thread_index);
1117 tcp_disconnect_pending_off (tc);
1118 tcp_handle_rst (tc);
1120 _vec_len (wrk->pending_resets) = 0;
1125 tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
1128 /* Reject out-of-order fins */
1129 if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt)
1132 /* Account for the FIN and send ack */
1134 tc->flags |= TCP_CONN_FINRCVD;
1135 tcp_program_ack (tc);
1136 /* Enter CLOSE-WAIT and notify session. To avoid lingering
1137 * in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
1138 tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
1139 tcp_program_disconnect (wrk, tc);
1140 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
1141 tcp_cfg.closewait_time);
1142 TCP_EVT (TCP_EVT_FIN_RCVD, tc);
1143 *error = TCP_ERROR_FIN_RCVD;
1146 /** Enqueue data for delivery to application */
1148 tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
1151 int written, error = TCP_ERROR_ENQUEUED;
1153 ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
1155 written = session_enqueue_stream_connection (&tc->connection, b, 0,
1156 1 /* queue event */ , 1);
1157 tc->bytes_in += written;
1159 TCP_EVT (TCP_EVT_INPUT, tc, 0, data_len, written);
1161 /* Update rcv_nxt */
1162 if (PREDICT_TRUE (written == data_len))
1164 tc->rcv_nxt += written;
1166 /* If more data written than expected, account for out-of-order bytes. */
1167 else if (written > data_len)
1169 tc->rcv_nxt += written;
1170 TCP_EVT (TCP_EVT_CC_INPUT, tc, data_len, written);
1172 else if (written > 0)
1174 /* We've written something but FIFO is probably full now */
1175 tc->rcv_nxt += written;
1176 error = TCP_ERROR_PARTIALLY_ENQUEUED;
1180 /* Packet made it through for ack processing */
1181 if (tc->rcv_wnd < tc->snd_mss)
1182 return TCP_ERROR_ZERO_RWND;
1184 return TCP_ERROR_FIFO_FULL;
1187 /* Update SACK list if need be */
1188 if (tcp_opts_sack_permitted (&tc->rcv_opts) && vec_len (tc->snd_sacks))
1190 /* Remove SACK blocks that have been delivered */
1191 tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
1197 /** Enqueue out-of-order data */
1199 tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
1205 ASSERT (seq_gt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
1208 /* Enqueue out-of-order data with relative offset */
1209 rv = session_enqueue_stream_connection (&tc->connection, b,
1210 vnet_buffer (b)->tcp.seq_number -
1211 tc->rcv_nxt, 0 /* queue event */ ,
1214 /* Nothing written */
1217 TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, 0);
1218 return TCP_ERROR_FIFO_FULL;
1221 TCP_EVT (TCP_EVT_INPUT, tc, 1, data_len, data_len);
1222 tc->bytes_in += data_len;
1224 /* Update SACK list if in use */
1225 if (tcp_opts_sack_permitted (&tc->rcv_opts))
1227 ooo_segment_t *newest;
1230 s0 = session_get (tc->c_s_index, tc->c_thread_index);
1232 /* Get the newest segment from the fifo */
1233 newest = svm_fifo_newest_ooo_segment (s0->rx_fifo);
1236 offset = ooo_segment_offset_prod (s0->rx_fifo, newest);
1237 ASSERT (offset <= vnet_buffer (b)->tcp.seq_number - tc->rcv_nxt);
1238 start = tc->rcv_nxt + offset;
1239 end = start + ooo_segment_length (s0->rx_fifo, newest);
1240 tcp_update_sack_list (tc, start, end);
1241 svm_fifo_newest_ooo_segment_reset (s0->rx_fifo);
1242 TCP_EVT (TCP_EVT_CC_SACKS, tc);
1246 return TCP_ERROR_ENQUEUED_OOO;
1250 tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop)
1252 u32 discard, first = b->current_length;
1253 vlib_main_t *vm = vlib_get_main ();
1255 /* Handle multi-buffer segments */
1256 if (n_bytes_to_drop > b->current_length)
1258 if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
1262 discard = clib_min (n_bytes_to_drop, b->current_length);
1263 vlib_buffer_advance (b, discard);
1264 b = vlib_get_buffer (vm, b->next_buffer);
1265 n_bytes_to_drop -= discard;
1267 while (n_bytes_to_drop);
1268 if (n_bytes_to_drop > first)
1269 b->total_length_not_including_first_buffer -= n_bytes_to_drop - first;
1272 vlib_buffer_advance (b, n_bytes_to_drop);
1273 vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop;
1278 * Receive buffer for connection and handle acks
1280 * It handles both in order or out-of-order data.
1283 tcp_segment_rcv (tcp_worker_ctx_t * wrk, tcp_connection_t * tc,
1286 u32 error, n_bytes_to_drop, n_data_bytes;
1288 vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset);
1289 n_data_bytes = vnet_buffer (b)->tcp.data_len;
1290 ASSERT (n_data_bytes);
1291 tc->data_segs_in += 1;
1293 /* Make sure we don't consume trailing bytes */
1294 if (PREDICT_FALSE (b->current_length > n_data_bytes))
1295 b->current_length = n_data_bytes;
1297 /* Handle out-of-order data */
1298 if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt))
1300 /* Old sequence numbers allowed through because they overlapped
1302 if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt))
1304 /* Completely in the past (possible retransmit). Ack
1305 * retransmissions since we may not have any data to send */
1306 if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
1308 tcp_program_dupack (tc);
1309 tc->errors.below_data_wnd++;
1310 error = TCP_ERROR_SEGMENT_OLD;
1314 /* Chop off the bytes in the past and see if what is left
1315 * can be enqueued in order */
1316 n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number;
1317 n_data_bytes -= n_bytes_to_drop;
1318 vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt;
1319 if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
1321 error = TCP_ERROR_SEGMENT_OLD;
1327 /* RFC2581: Enqueue and send DUPACK for fast retransmit */
1328 error = tcp_session_enqueue_ooo (tc, b, n_data_bytes);
1329 tcp_program_dupack (tc);
1330 TCP_EVT (TCP_EVT_DUPACK_SENT, tc, vnet_buffer (b)->tcp);
1331 tc->errors.above_data_wnd += seq_gt (vnet_buffer (b)->tcp.seq_end,
1332 tc->rcv_las + tc->rcv_wnd);
1338 /* In order data, enqueue. Fifo figures out by itself if any out-of-order
1339 * segments can be enqueued after fifo tail offset changes. */
1340 error = tcp_session_enqueue_data (tc, b, n_data_bytes);
1341 tcp_program_ack (tc);
1349 tcp_header_t tcp_header;
1350 tcp_connection_t tcp_connection;
1354 format_tcp_rx_trace (u8 * s, va_list * args)
1356 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1357 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1358 tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
1359 tcp_connection_t *tc = &t->tcp_connection;
1360 u32 indent = format_get_indent (s);
1362 s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc,
1363 format_tcp_state, tc->state, format_white_space, indent,
1364 format_tcp_header, &t->tcp_header, 128);
1370 format_tcp_rx_trace_short (u8 * s, va_list * args)
1372 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1373 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1374 tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
1376 s = format (s, "%d -> %d (%U)",
1377 clib_net_to_host_u16 (t->tcp_header.dst_port),
1378 clib_net_to_host_u16 (t->tcp_header.src_port), format_tcp_state,
1379 t->tcp_connection.state);
1385 tcp_set_rx_trace_data (tcp_rx_trace_t * t0, tcp_connection_t * tc0,
1386 tcp_header_t * th0, vlib_buffer_t * b0, u8 is_ip4)
1390 clib_memcpy_fast (&t0->tcp_connection, tc0,
1391 sizeof (t0->tcp_connection));
1395 th0 = tcp_buffer_hdr (b0);
1397 clib_memcpy_fast (&t0->tcp_header, th0, sizeof (t0->tcp_header));
1401 tcp_established_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
1402 vlib_frame_t * frame, u8 is_ip4)
1406 n_left = frame->n_vectors;
1407 from = vlib_frame_vector_args (frame);
1411 tcp_connection_t *tc0;
1418 b0 = vlib_get_buffer (vm, bi0);
1420 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1422 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
1423 tc0 = tcp_connection_get (vnet_buffer (b0)->tcp.connection_index,
1425 th0 = tcp_buffer_hdr (b0);
1426 tcp_set_rx_trace_data (t0, tc0, th0, b0, is_ip4);
1435 tcp_node_inc_counter_i (vlib_main_t * vm, u32 tcp4_node, u32 tcp6_node,
1436 u8 is_ip4, u32 evt, u32 val)
1439 vlib_node_increment_counter (vm, tcp4_node, evt, val);
1441 vlib_node_increment_counter (vm, tcp6_node, evt, val);
1444 #define tcp_maybe_inc_counter(node_id, err, count) \
1446 if (next0 != tcp_next_drop (is_ip4)) \
1447 tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
1448 tcp6_##node_id##_node.index, is_ip4, err, \
1451 #define tcp_inc_counter(node_id, err, count) \
1452 tcp_node_inc_counter_i (vm, tcp4_##node_id##_node.index, \
1453 tcp6_##node_id##_node.index, is_ip4, \
1455 #define tcp_maybe_inc_err_counter(cnts, err) \
1457 cnts[err] += (next0 != tcp_next_drop (is_ip4)); \
1459 #define tcp_inc_err_counter(cnts, err, val) \
1463 #define tcp_store_err_counters(node_id, cnts) \
1466 for (i = 0; i < TCP_N_ERROR; i++) \
1468 tcp_inc_counter(node_id, i, cnts[i]); \
1473 tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1474 vlib_frame_t * frame, int is_ip4)
1476 u32 thread_index = vm->thread_index, errors = 0;
1477 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1478 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1479 u16 err_counters[TCP_N_ERROR] = { 0 };
1480 u32 n_left_from, *from;
1482 if (node->flags & VLIB_NODE_FLAG_TRACE)
1483 tcp_established_trace_frame (vm, node, frame, is_ip4);
1485 from = vlib_frame_vector_args (frame);
1486 n_left_from = frame->n_vectors;
1488 vlib_get_buffers (vm, from, bufs, n_left_from);
1491 while (n_left_from > 0)
1493 u32 error = TCP_ERROR_ACK_OK;
1494 tcp_connection_t *tc;
1497 if (n_left_from > 1)
1499 vlib_prefetch_buffer_header (b[1], LOAD);
1500 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
1503 tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
1506 if (PREDICT_FALSE (tc == 0))
1508 error = TCP_ERROR_INVALID_CONNECTION;
1512 th = tcp_buffer_hdr (b[0]);
1514 /* TODO header prediction fast path */
1516 /* 1-4: check SEQ, RST, SYN */
1517 if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], th, &error)))
1519 TCP_EVT (TCP_EVT_SEG_INVALID, tc, vnet_buffer (b[0])->tcp);
1523 /* 5: check the ACK field */
1524 if (PREDICT_FALSE (tcp_rcv_ack (wrk, tc, b[0], th, &error)))
1527 /* 6: check the URG bit TODO */
1529 /* 7: process the segment text */
1530 if (vnet_buffer (b[0])->tcp.data_len)
1531 error = tcp_segment_rcv (wrk, tc, b[0]);
1533 /* 8: check the FIN bit */
1534 if (PREDICT_FALSE (tcp_is_fin (th)))
1535 tcp_rcv_fin (wrk, tc, b[0], &error);
1538 tcp_inc_err_counter (err_counters, error, 1);
1544 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
1546 err_counters[TCP_ERROR_MSG_QUEUE_FULL] = errors;
1547 tcp_store_err_counters (established, err_counters);
1548 tcp_handle_postponed_dequeues (wrk);
1549 tcp_handle_disconnects (wrk);
1550 vlib_buffer_free (vm, from, frame->n_vectors);
1552 return frame->n_vectors;
1555 VLIB_NODE_FN (tcp4_established_node) (vlib_main_t * vm,
1556 vlib_node_runtime_t * node,
1557 vlib_frame_t * from_frame)
1559 return tcp46_established_inline (vm, node, from_frame, 1 /* is_ip4 */ );
1562 VLIB_NODE_FN (tcp6_established_node) (vlib_main_t * vm,
1563 vlib_node_runtime_t * node,
1564 vlib_frame_t * from_frame)
1566 return tcp46_established_inline (vm, node, from_frame, 0 /* is_ip4 */ );
1570 VLIB_REGISTER_NODE (tcp4_established_node) =
1572 .name = "tcp4-established",
1573 /* Takes a vector of packets. */
1574 .vector_size = sizeof (u32),
1575 .n_errors = TCP_N_ERROR,
1576 .error_counters = tcp_input_error_counters,
1577 .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
1580 #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n,
1581 foreach_tcp_state_next
1584 .format_trace = format_tcp_rx_trace_short,
1589 VLIB_REGISTER_NODE (tcp6_established_node) =
1591 .name = "tcp6-established",
1592 /* Takes a vector of packets. */
1593 .vector_size = sizeof (u32),
1594 .n_errors = TCP_N_ERROR,
1595 .error_counters = tcp_input_error_counters,
1596 .n_next_nodes = TCP_ESTABLISHED_N_NEXT,
1599 #define _(s,n) [TCP_ESTABLISHED_NEXT_##s] = n,
1600 foreach_tcp_state_next
1603 .format_trace = format_tcp_rx_trace_short,
1609 tcp_lookup_is_valid (tcp_connection_t * tc, vlib_buffer_t * b,
1612 transport_connection_t *tmp = 0;
1619 if (tc->c_lcl_port == 0 && tc->state == TCP_STATE_LISTEN)
1622 u8 is_ip_valid = 0, val_l, val_r;
1624 if (tc->connection.is_ip4)
1626 ip4_header_t *ip4_hdr = (ip4_header_t *) vlib_buffer_get_current (b);
1628 val_l = !ip4_address_compare (&ip4_hdr->dst_address,
1629 &tc->connection.lcl_ip.ip4);
1630 val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 1);
1631 val_r = !ip4_address_compare (&ip4_hdr->src_address,
1632 &tc->connection.rmt_ip.ip4);
1633 val_r = val_r || tc->state == TCP_STATE_LISTEN;
1634 is_ip_valid = val_l && val_r;
1638 ip6_header_t *ip6_hdr = (ip6_header_t *) vlib_buffer_get_current (b);
1640 val_l = !ip6_address_compare (&ip6_hdr->dst_address,
1641 &tc->connection.lcl_ip.ip6);
1642 val_l = val_l || ip_is_zero (&tc->connection.lcl_ip, 0);
1643 val_r = !ip6_address_compare (&ip6_hdr->src_address,
1644 &tc->connection.rmt_ip.ip6);
1645 val_r = val_r || tc->state == TCP_STATE_LISTEN;
1646 is_ip_valid = val_l && val_r;
1649 u8 is_valid = (tc->c_lcl_port == hdr->dst_port
1650 && (tc->state == TCP_STATE_LISTEN
1651 || tc->c_rmt_port == hdr->src_port) && is_ip_valid);
1655 handle = session_lookup_half_open_handle (&tc->connection);
1656 tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF,
1657 tc->c_proto, tc->c_is_ip4);
1661 if (tmp->lcl_port == hdr->dst_port
1662 && tmp->rmt_port == hdr->src_port)
1664 TCP_DBG ("half-open is valid!");
1673 * Lookup transport connection
1675 static tcp_connection_t *
1676 tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
1680 transport_connection_t *tconn;
1681 tcp_connection_t *tc;
1686 ip4 = vlib_buffer_get_current (b);
1687 tcp = ip4_next_header (ip4);
1688 tconn = session_lookup_connection_wt4 (fib_index,
1693 TRANSPORT_PROTO_TCP,
1694 thread_index, &is_filtered);
1695 tc = tcp_get_connection_from_transport (tconn);
1696 ASSERT (tcp_lookup_is_valid (tc, b, tcp));
1701 ip6 = vlib_buffer_get_current (b);
1702 tcp = ip6_next_header (ip6);
1703 tconn = session_lookup_connection_wt6 (fib_index,
1708 TRANSPORT_PROTO_TCP,
1709 thread_index, &is_filtered);
1710 tc = tcp_get_connection_from_transport (tconn);
1711 ASSERT (tcp_lookup_is_valid (tc, b, tcp));
1716 static tcp_connection_t *
1717 tcp_lookup_listener (vlib_buffer_t * b, u32 fib_index, int is_ip4)
1723 ip4_header_t *ip4 = vlib_buffer_get_current (b);
1724 tcp_header_t *tcp = tcp_buffer_hdr (b);
1725 s = session_lookup_listener4 (fib_index,
1727 tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
1731 ip6_header_t *ip6 = vlib_buffer_get_current (b);
1732 tcp_header_t *tcp = tcp_buffer_hdr (b);
1733 s = session_lookup_listener6 (fib_index,
1735 tcp->dst_port, TRANSPORT_PROTO_TCP, 1);
1738 if (PREDICT_TRUE (s != 0))
1739 return tcp_get_connection_from_transport (transport_get_listener
1740 (TRANSPORT_PROTO_TCP,
1741 s->connection_index));
1747 tcp46_syn_sent_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
1748 u32 *from, u32 n_bufs)
1750 tcp_connection_t *tc = 0;
1755 for (i = 0; i < n_bufs; i++)
1757 b = vlib_get_buffer (vm, from[i]);
1758 if (!(b->flags & VLIB_BUFFER_IS_TRACED))
1761 tcp_half_open_connection_get (vnet_buffer (b)->tcp.connection_index);
1762 t = vlib_add_trace (vm, node, b, sizeof (*t));
1763 tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
1768 tcp_check_tx_offload (tcp_connection_t * tc, int is_ipv4)
1770 vnet_main_t *vnm = vnet_get_main ();
1771 const dpo_id_t *dpo;
1772 const load_balance_t *lb;
1773 vnet_hw_interface_t *hw_if;
1774 u32 sw_if_idx, lb_idx;
1778 ip4_address_t *dst_addr = &(tc->c_rmt_ip.ip4);
1779 lb_idx = ip4_fib_forwarding_lookup (tc->c_fib_index, dst_addr);
1783 ip6_address_t *dst_addr = &(tc->c_rmt_ip.ip6);
1784 lb_idx = ip6_fib_table_fwding_lookup (tc->c_fib_index, dst_addr);
1787 lb = load_balance_get (lb_idx);
1788 if (PREDICT_FALSE (lb->lb_n_buckets > 1))
1790 dpo = load_balance_get_bucket_i (lb, 0);
1792 sw_if_idx = dpo_get_urpf (dpo);
1793 if (PREDICT_FALSE (sw_if_idx == ~0))
1796 hw_if = vnet_get_sup_hw_interface (vnm, sw_if_idx);
1797 if (hw_if->caps & VNET_HW_IF_CAP_TCP_GSO)
1798 tc->cfg_flags |= TCP_CFG_F_TSO;
1802 tcp46_syn_sent_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1803 vlib_frame_t *frame, int is_ip4)
1805 u32 n_left_from, *from, thread_index = vm->thread_index, errors = 0;
1806 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
1807 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1809 from = vlib_frame_vector_args (frame);
1810 n_left_from = frame->n_vectors;
1812 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
1813 tcp46_syn_sent_trace_frame (vm, node, from, n_left_from);
1815 vlib_get_buffers (vm, from, bufs, n_left_from);
1818 while (n_left_from > 0)
1820 u32 ack, seq, error = TCP_ERROR_NONE;
1821 tcp_connection_t *tc, *new_tc;
1824 tc = tcp_half_open_connection_get (
1825 vnet_buffer (b[0])->tcp.connection_index);
1826 if (PREDICT_FALSE (tc == 0))
1828 error = TCP_ERROR_INVALID_CONNECTION;
1832 /* Half-open completed or cancelled recently but the connection
1833 * was't removed yet by the owning thread */
1834 if (PREDICT_FALSE (tc->flags & TCP_CONN_HALF_OPEN_DONE))
1836 error = TCP_ERROR_SPURIOUS_SYN_ACK;
1840 ack = vnet_buffer (b[0])->tcp.ack_number;
1841 seq = vnet_buffer (b[0])->tcp.seq_number;
1842 tcp = tcp_buffer_hdr (b[0]);
1844 /* Crude check to see if the connection handle does not match
1845 * the packet. Probably connection just switched to established */
1846 if (PREDICT_FALSE (tcp->dst_port != tc->c_lcl_port ||
1847 tcp->src_port != tc->c_rmt_port))
1849 error = TCP_ERROR_INVALID_CONNECTION;
1853 if (PREDICT_FALSE (!tcp_ack (tcp) && !tcp_rst (tcp) && !tcp_syn (tcp)))
1855 error = TCP_ERROR_SEGMENT_INVALID;
1859 /* SYNs consume sequence numbers */
1860 vnet_buffer (b[0])->tcp.seq_end += tcp_is_syn (tcp);
1863 * 1. check the ACK bit
1867 * If the ACK bit is set
1868 * If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send a reset (unless
1869 * the RST bit is set, if so drop the segment and return)
1870 * <SEQ=SEG.ACK><CTL=RST>
1871 * and discard the segment. Return.
1872 * If SND.UNA =< SEG.ACK =< SND.NXT then the ACK is acceptable.
1876 if (seq_leq (ack, tc->iss) || seq_gt (ack, tc->snd_nxt))
1879 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
1880 error = TCP_ERROR_RCV_WND;
1884 /* Make sure ACK is valid */
1885 if (seq_gt (tc->snd_una, ack))
1887 error = TCP_ERROR_ACK_INVALID;
1893 * 2. check the RST bit
1898 /* If ACK is acceptable, signal client that peer is not
1899 * willing to accept connection and drop connection*/
1901 tcp_rcv_rst (wrk, tc);
1902 error = TCP_ERROR_RST_RCVD;
1907 * 3. check the security and precedence (skipped)
1911 * 4. check the SYN bit
1914 /* No SYN flag. Drop. */
1917 error = TCP_ERROR_SEGMENT_INVALID;
1922 if (tcp_options_parse (tcp, &tc->rcv_opts, 1))
1924 error = TCP_ERROR_OPTIONS;
1928 /* Valid SYN or SYN-ACK. Move connection from half-open pool to
1929 * current thread pool. */
1930 new_tc = tcp_connection_alloc_w_base (thread_index, &tc);
1931 new_tc->rcv_nxt = vnet_buffer (b[0])->tcp.seq_end;
1933 new_tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
1935 if (tcp_opts_tstamp (&new_tc->rcv_opts))
1937 new_tc->tsval_recent = new_tc->rcv_opts.tsval;
1938 new_tc->tsval_recent_age = tcp_time_tstamp (thread_index);
1941 if (tcp_opts_wscale (&new_tc->rcv_opts))
1942 new_tc->snd_wscale = new_tc->rcv_opts.wscale;
1944 new_tc->rcv_wscale = 0;
1946 new_tc->snd_wnd = clib_net_to_host_u16 (tcp->window)
1947 << new_tc->snd_wscale;
1948 new_tc->snd_wl1 = seq;
1949 new_tc->snd_wl2 = ack;
1951 tcp_connection_init_vars (new_tc);
1953 /* SYN-ACK: See if we can switch to ESTABLISHED state */
1954 if (PREDICT_TRUE (tcp_ack (tcp)))
1956 /* Our SYN is ACKed: we have iss < ack = snd_una */
1958 /* TODO Dequeue acknowledged segments if we support Fast Open */
1959 new_tc->snd_una = ack;
1960 new_tc->state = TCP_STATE_ESTABLISHED;
1962 /* Make sure las is initialized for the wnd computation */
1963 new_tc->rcv_las = new_tc->rcv_nxt;
1965 /* Notify app that we have connection. If session layer can't
1966 * allocate session send reset */
1967 if (session_stream_connect_notify (&new_tc->connection,
1970 tcp_send_reset_w_pkt (new_tc, b[0], thread_index, is_ip4);
1971 tcp_connection_cleanup (new_tc);
1972 error = TCP_ERROR_CREATE_SESSION_FAIL;
1976 transport_fifos_init_ooo (&new_tc->connection);
1977 new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection);
1978 /* Update rtt with the syn-ack sample */
1979 tcp_estimate_initial_rtt (new_tc);
1980 TCP_EVT (TCP_EVT_SYNACK_RCVD, new_tc);
1981 error = TCP_ERROR_SYN_ACKS_RCVD;
1983 /* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
1986 new_tc->state = TCP_STATE_SYN_RCVD;
1988 /* Notify app that we have connection */
1989 if (session_stream_connect_notify (&new_tc->connection,
1992 tcp_connection_cleanup (new_tc);
1993 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
1994 TCP_EVT (TCP_EVT_RST_SENT, tc);
1995 error = TCP_ERROR_CREATE_SESSION_FAIL;
1999 transport_fifos_init_ooo (&new_tc->connection);
2000 new_tc->tx_fifo_size = transport_tx_fifo_size (&new_tc->connection);
2002 tcp_init_snd_vars (new_tc);
2003 tcp_send_synack (new_tc);
2004 error = TCP_ERROR_SYNS_RCVD;
2008 if (!(new_tc->cfg_flags & TCP_CFG_F_NO_TSO))
2009 tcp_check_tx_offload (new_tc, is_ip4);
2011 /* Read data, if any */
2012 if (PREDICT_FALSE (vnet_buffer (b[0])->tcp.data_len))
2014 clib_warning ("rcvd data in syn-sent");
2015 error = tcp_segment_rcv (wrk, new_tc, b[0]);
2016 if (error == TCP_ERROR_ACK_OK)
2017 error = TCP_ERROR_SYN_ACKS_RCVD;
2021 /* Send ack now instead of programming it because connection was
2022 * just established and it's not optional. */
2023 tcp_send_ack (new_tc);
2028 /* If this is not the owning thread, wait for syn retransmit to
2029 * expire and cleanup then */
2030 if (tcp_half_open_connection_cleanup (tc))
2031 tc->flags |= TCP_CONN_HALF_OPEN_DONE;
2037 tcp_inc_counter (syn_sent, error, 1);
2041 session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP, thread_index);
2042 tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors);
2043 vlib_buffer_free (vm, from, frame->n_vectors);
2044 tcp_handle_disconnects (wrk);
2046 return frame->n_vectors;
2049 VLIB_NODE_FN (tcp4_syn_sent_node) (vlib_main_t * vm,
2050 vlib_node_runtime_t * node,
2051 vlib_frame_t * from_frame)
2053 return tcp46_syn_sent_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2056 VLIB_NODE_FN (tcp6_syn_sent_node) (vlib_main_t * vm,
2057 vlib_node_runtime_t * node,
2058 vlib_frame_t * from_frame)
2060 return tcp46_syn_sent_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2064 VLIB_REGISTER_NODE (tcp4_syn_sent_node) =
2066 .name = "tcp4-syn-sent",
2067 /* Takes a vector of packets. */
2068 .vector_size = sizeof (u32),
2069 .n_errors = TCP_N_ERROR,
2070 .error_counters = tcp_input_error_counters,
2071 .n_next_nodes = TCP_SYN_SENT_N_NEXT,
2074 #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
2075 foreach_tcp_state_next
2078 .format_trace = format_tcp_rx_trace_short,
2083 VLIB_REGISTER_NODE (tcp6_syn_sent_node) =
2085 .name = "tcp6-syn-sent",
2086 /* Takes a vector of packets. */
2087 .vector_size = sizeof (u32),
2088 .n_errors = TCP_N_ERROR,
2089 .error_counters = tcp_input_error_counters,
2090 .n_next_nodes = TCP_SYN_SENT_N_NEXT,
2093 #define _(s,n) [TCP_SYN_SENT_NEXT_##s] = n,
2094 foreach_tcp_state_next
2097 .format_trace = format_tcp_rx_trace_short,
2102 tcp46_rcv_process_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
2103 u32 *from, u32 n_bufs)
2105 u32 thread_index = vm->thread_index;
2106 tcp_connection_t *tc = 0;
2111 for (i = 0; i < n_bufs; i++)
2113 b = vlib_get_buffer (vm, from[i]);
2114 if (!(b->flags & VLIB_BUFFER_IS_TRACED))
2116 tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
2118 t = vlib_add_trace (vm, node, b, sizeof (*t));
2119 tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
2124 * Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED
2125 * as per RFC793 p. 64
2128 tcp46_rcv_process_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2129 vlib_frame_t *frame, int is_ip4)
2131 u32 thread_index = vm->thread_index, errors, n_left_from, *from, max_deq;
2132 tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
2133 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2135 from = vlib_frame_vector_args (frame);
2136 n_left_from = frame->n_vectors;
2138 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2139 tcp46_rcv_process_trace_frame (vm, node, from, n_left_from);
2141 vlib_get_buffers (vm, from, bufs, n_left_from);
2144 while (n_left_from > 0)
2146 u32 error = TCP_ERROR_NONE;
2147 tcp_header_t *tcp = 0;
2148 tcp_connection_t *tc;
2151 tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2153 if (PREDICT_FALSE (tc == 0))
2155 error = TCP_ERROR_INVALID_CONNECTION;
2159 tcp = tcp_buffer_hdr (b[0]);
2160 is_fin = tcp_is_fin (tcp);
2164 if (!(tc->connection.flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
2166 tcp_connection_t *tmp;
2167 tmp = tcp_lookup_connection (tc->c_fib_index, b[0], thread_index,
2169 if (tmp->state != tc->state)
2171 if (tc->state != TCP_STATE_CLOSED)
2172 clib_warning ("state changed");
2179 * Special treatment for CLOSED
2181 if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED))
2183 error = TCP_ERROR_CONNECTION_CLOSED;
2188 * For all other states (except LISTEN)
2191 /* 1-4: check SEQ, RST, SYN */
2192 if (PREDICT_FALSE (tcp_segment_validate (wrk, tc, b[0], tcp, &error)))
2195 /* 5: check the ACK field */
2198 case TCP_STATE_SYN_RCVD:
2200 /* Make sure the segment is exactly right */
2201 if (tc->rcv_nxt != vnet_buffer (b[0])->tcp.seq_number || is_fin)
2203 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
2204 error = TCP_ERROR_SEGMENT_INVALID;
2209 * If the segment acknowledgment is not acceptable, form a
2211 * <SEQ=SEG.ACK><CTL=RST>
2214 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2216 tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
2217 error = TCP_ERROR_SEGMENT_INVALID;
2221 /* Update rtt and rto */
2222 tcp_estimate_initial_rtt (tc);
2223 tcp_connection_tx_pacer_update (tc);
2225 /* Switch state to ESTABLISHED */
2226 tc->state = TCP_STATE_ESTABLISHED;
2227 TCP_EVT (TCP_EVT_STATE_CHANGE, tc);
2229 if (!(tc->cfg_flags & TCP_CFG_F_NO_TSO))
2230 tcp_check_tx_offload (tc, is_ip4);
2232 /* Initialize session variables */
2233 tc->snd_una = vnet_buffer (b[0])->tcp.ack_number;
2234 tc->snd_wnd = clib_net_to_host_u16 (tcp->window)
2235 << tc->rcv_opts.wscale;
2236 tc->snd_wl1 = vnet_buffer (b[0])->tcp.seq_number;
2237 tc->snd_wl2 = vnet_buffer (b[0])->tcp.ack_number;
2239 /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
2240 tcp_retransmit_timer_reset (&wrk->timer_wheel, tc);
2241 if (session_stream_accept_notify (&tc->connection))
2243 error = TCP_ERROR_MSG_QUEUE_FULL;
2244 tcp_send_reset (tc);
2245 session_transport_delete_notify (&tc->connection);
2246 tcp_connection_cleanup (tc);
2249 error = TCP_ERROR_ACK_OK;
2251 case TCP_STATE_ESTABLISHED:
2252 /* We can get packets in established state here because they
2253 * were enqueued before state change */
2254 if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
2258 case TCP_STATE_FIN_WAIT_1:
2259 /* In addition to the processing for the ESTABLISHED state, if
2260 * our FIN is now acknowledged then enter FIN-WAIT-2 and
2261 * continue processing in that state. */
2262 if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
2265 /* Still have to send the FIN */
2266 if (tc->flags & TCP_CONN_FINPNDG)
2268 /* TX fifo finally drained */
2269 max_deq = transport_max_tx_dequeue (&tc->connection);
2270 if (max_deq <= tc->burst_acked)
2272 /* If a fin was received and data was acked extend wait */
2273 else if ((tc->flags & TCP_CONN_FINRCVD) && tc->bytes_acked)
2274 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2275 tcp_cfg.closewait_time);
2277 /* If FIN is ACKed */
2278 else if (tc->snd_una == tc->snd_nxt)
2280 /* Stop all retransmit timers because we have nothing more
2282 tcp_connection_timers_reset (tc);
2284 /* We already have a FIN but didn't transition to CLOSING
2285 * because of outstanding tx data. Close the connection. */
2286 if (tc->flags & TCP_CONN_FINRCVD)
2288 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
2289 session_transport_closed_notify (&tc->connection);
2290 tcp_program_cleanup (wrk, tc);
2294 tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_2);
2295 /* Enable waitclose because we're willing to wait for peer's
2296 * FIN but not indefinitely. */
2297 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2298 tcp_cfg.finwait2_time);
2300 /* Don't try to deq the FIN acked */
2301 if (tc->burst_acked > 1)
2302 session_tx_fifo_dequeue_drop (&tc->connection,
2303 tc->burst_acked - 1);
2304 tc->burst_acked = 0;
2307 case TCP_STATE_FIN_WAIT_2:
2308 /* In addition to the processing for the ESTABLISHED state, if
2309 * the retransmission queue is empty, the user's CLOSE can be
2310 * acknowledged ("ok") but do not delete the TCB. */
2311 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2313 tc->burst_acked = 0;
2315 case TCP_STATE_CLOSE_WAIT:
2316 /* Do the same processing as for the ESTABLISHED state. */
2317 if (tcp_rcv_ack (wrk, tc, b[0], tcp, &error))
2320 if (!(tc->flags & TCP_CONN_FINPNDG))
2323 /* Still have outstanding tx data */
2324 max_deq = transport_max_tx_dequeue (&tc->connection);
2325 if (max_deq > tc->burst_acked)
2329 tcp_connection_timers_reset (tc);
2330 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
2331 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2332 tcp_cfg.lastack_time);
2334 case TCP_STATE_CLOSING:
2335 /* In addition to the processing for the ESTABLISHED state, if
2336 * the ACK acknowledges our FIN then enter the TIME-WAIT state,
2337 * otherwise ignore the segment. */
2338 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2341 if (tc->snd_una != tc->snd_nxt)
2344 tcp_connection_timers_reset (tc);
2345 tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT);
2346 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2347 tcp_cfg.timewait_time);
2348 session_transport_closed_notify (&tc->connection);
2352 case TCP_STATE_LAST_ACK:
2353 /* The only thing that [should] arrive in this state is an
2354 * acknowledgment of our FIN. If our FIN is now acknowledged,
2355 * delete the TCB, enter the CLOSED state, and return. */
2357 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2360 /* Apparently our ACK for the peer's FIN was lost */
2361 if (is_fin && tc->snd_una != tc->snd_nxt)
2367 tcp_connection_set_state (tc, TCP_STATE_CLOSED);
2368 session_transport_closed_notify (&tc->connection);
2370 /* Don't free the connection from the data path since
2371 * we can't ensure that we have no packets already enqueued
2372 * to output. Rely instead on the waitclose timer */
2373 tcp_connection_timers_reset (tc);
2374 tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
2379 case TCP_STATE_TIME_WAIT:
2380 /* The only thing that can arrive in this state is a
2381 * retransmission of the remote FIN. Acknowledge it, and restart
2382 * the 2 MSL timeout. */
2384 if (tcp_rcv_ack_no_cc (tc, b[0], &error))
2390 tcp_program_ack (tc);
2391 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2392 tcp_cfg.timewait_time);
2400 /* 6: check the URG bit TODO */
2402 /* 7: process the segment text */
2405 case TCP_STATE_ESTABLISHED:
2406 case TCP_STATE_FIN_WAIT_1:
2407 case TCP_STATE_FIN_WAIT_2:
2408 if (vnet_buffer (b[0])->tcp.data_len)
2409 error = tcp_segment_rcv (wrk, tc, b[0]);
2410 /* Don't accept out of order fins lower */
2411 if (vnet_buffer (b[0])->tcp.seq_end != tc->rcv_nxt)
2414 case TCP_STATE_CLOSE_WAIT:
2415 case TCP_STATE_CLOSING:
2416 case TCP_STATE_LAST_ACK:
2417 case TCP_STATE_TIME_WAIT:
2418 /* This should not occur, since a FIN has been received from the
2419 * remote side. Ignore the segment text. */
2423 /* 8: check the FIN bit */
2427 TCP_EVT (TCP_EVT_FIN_RCVD, tc);
2431 case TCP_STATE_ESTABLISHED:
2432 /* Account for the FIN and send ack */
2434 tcp_program_ack (tc);
2435 tcp_connection_set_state (tc, TCP_STATE_CLOSE_WAIT);
2436 tcp_program_disconnect (wrk, tc);
2437 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2438 tcp_cfg.closewait_time);
2440 case TCP_STATE_SYN_RCVD:
2441 /* Send FIN-ACK, enter LAST-ACK and because the app was not
2442 * notified yet, set a cleanup timer instead of relying on
2443 * disconnect notify and the implicit close call. */
2444 tcp_connection_timers_reset (tc);
2447 tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
2448 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2449 tcp_cfg.lastack_time);
2451 case TCP_STATE_CLOSE_WAIT:
2452 case TCP_STATE_CLOSING:
2453 case TCP_STATE_LAST_ACK:
2456 case TCP_STATE_FIN_WAIT_1:
2459 if (tc->flags & TCP_CONN_FINPNDG)
2461 /* If data is outstanding, stay in FIN_WAIT_1 and try to finish
2462 * sending it. Since we already received a fin, do not wait
2464 tc->flags |= TCP_CONN_FINRCVD;
2465 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2466 tcp_cfg.closewait_time);
2470 tcp_connection_set_state (tc, TCP_STATE_CLOSING);
2471 tcp_program_ack (tc);
2472 /* Wait for ACK for our FIN but not forever */
2473 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2474 tcp_cfg.closing_time);
2477 case TCP_STATE_FIN_WAIT_2:
2478 /* Got FIN, send ACK! Be more aggressive with resource cleanup */
2480 tcp_connection_set_state (tc, TCP_STATE_TIME_WAIT);
2481 tcp_connection_timers_reset (tc);
2482 tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2483 tcp_cfg.timewait_time);
2484 tcp_program_ack (tc);
2485 session_transport_closed_notify (&tc->connection);
2487 case TCP_STATE_TIME_WAIT:
2488 /* Remain in the TIME-WAIT state. Restart the time-wait
2491 tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
2492 tcp_cfg.timewait_time);
2495 error = TCP_ERROR_FIN_RCVD;
2501 tcp_inc_counter (rcv_process, error, 1);
2504 errors = session_main_flush_enqueue_events (TRANSPORT_PROTO_TCP,
2506 tcp_inc_counter (rcv_process, TCP_ERROR_MSG_QUEUE_FULL, errors);
2507 tcp_handle_postponed_dequeues (wrk);
2508 tcp_handle_disconnects (wrk);
2509 vlib_buffer_free (vm, from, frame->n_vectors);
2511 return frame->n_vectors;
2514 VLIB_NODE_FN (tcp4_rcv_process_node) (vlib_main_t * vm,
2515 vlib_node_runtime_t * node,
2516 vlib_frame_t * from_frame)
2518 return tcp46_rcv_process_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2521 VLIB_NODE_FN (tcp6_rcv_process_node) (vlib_main_t * vm,
2522 vlib_node_runtime_t * node,
2523 vlib_frame_t * from_frame)
2525 return tcp46_rcv_process_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2529 VLIB_REGISTER_NODE (tcp4_rcv_process_node) =
2531 .name = "tcp4-rcv-process",
2532 /* Takes a vector of packets. */
2533 .vector_size = sizeof (u32),
2534 .n_errors = TCP_N_ERROR,
2535 .error_counters = tcp_input_error_counters,
2536 .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
2539 #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n,
2540 foreach_tcp_state_next
2543 .format_trace = format_tcp_rx_trace_short,
2548 VLIB_REGISTER_NODE (tcp6_rcv_process_node) =
2550 .name = "tcp6-rcv-process",
2551 /* Takes a vector of packets. */
2552 .vector_size = sizeof (u32),
2553 .n_errors = TCP_N_ERROR,
2554 .error_counters = tcp_input_error_counters,
2555 .n_next_nodes = TCP_RCV_PROCESS_N_NEXT,
2558 #define _(s,n) [TCP_RCV_PROCESS_NEXT_##s] = n,
2559 foreach_tcp_state_next
2562 .format_trace = format_tcp_rx_trace_short,
2567 tcp46_listen_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node,
2568 u32 *to_next, u32 n_bufs)
2570 tcp_connection_t *tc = 0;
2575 for (i = 0; i < n_bufs; i++)
2577 b = vlib_get_buffer (vm, to_next[i]);
2578 if (!(b->flags & VLIB_BUFFER_IS_TRACED))
2580 if (vnet_buffer (b)->tcp.flags == TCP_STATE_LISTEN)
2581 tc = tcp_listener_get (vnet_buffer (b)->tcp.connection_index);
2582 t = vlib_add_trace (vm, node, b, sizeof (*t));
2583 tcp_set_rx_trace_data (t, tc, tcp_buffer_hdr (b), b, 1);
2588 * SYN received in TIME-WAIT state.
2591 * "When a connection is [...] on TIME-WAIT state [...]
2592 * [a TCP] MAY accept a new SYN from the remote TCP to
2593 * reopen the connection directly, if it:
2595 * (1) assigns its initial sequence number for the new
2596 * connection to be larger than the largest sequence
2597 * number it used on the previous connection incarnation,
2600 * (2) returns to TIME-WAIT state if the SYN turns out
2601 * to be an old duplicate".
2603 * The function returns true if the syn can be accepted during
2604 * connection time-wait (port reuse). In this case the function
2605 * also calculates what the iss should be for the new connection.
2608 syn_during_timewait (tcp_connection_t *tc, vlib_buffer_t *b, u32 *iss)
2610 int paws_reject = tcp_segment_check_paws (tc);
2614 /* Check that the SYN arrived out of window. We accept it */
2616 (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt) ||
2617 (tcp_opts_tstamp (&tc->rcv_opts) &&
2618 timestamp_lt (tc->tsval_recent, tc->rcv_opts.tsval))))
2620 /* Set the iss of the new connection to be the largest sequence number
2621 * the old peer would have accepted and add some random number
2623 tw_iss = tc->snd_nxt + tcp_available_snd_wnd (tc) +
2624 (uword) (tcp_time_now_us (tc->c_thread_index) * 1e6) % 65535;
2634 "ERROR not accepting SYN in timewait,paws_reject=%d, seq_num =%ld, "
2635 "rcv_nxt=%ld, tstamp_present=%d, tsval_recent = %d, tsval = %d\n",
2636 paws_reject, vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt,
2637 tcp_opts_tstamp (&tc->rcv_opts), tc->tsval_recent, tc->rcv_opts.tsval);
2643 * LISTEN state processing as per RFC 793 p. 65
2646 tcp46_listen_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2647 vlib_frame_t *frame, int is_ip4)
2649 u32 n_left_from, *from, n_syns = 0;
2650 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2651 u32 thread_index = vm->thread_index;
2654 from = vlib_frame_vector_args (frame);
2655 n_left_from = frame->n_vectors;
2657 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
2658 tcp46_listen_trace_frame (vm, node, from, n_left_from);
2660 vlib_get_buffers (vm, from, bufs, n_left_from);
2663 while (n_left_from > 0)
2665 u32 error = TCP_ERROR_NONE;
2666 tcp_connection_t *lc, *child;
2668 /* Flags initialized with connection state after lookup */
2669 if (vnet_buffer (b[0])->tcp.flags == TCP_STATE_LISTEN)
2671 lc = tcp_listener_get (vnet_buffer (b[0])->tcp.connection_index);
2673 else /* We are in TimeWait state*/
2675 tcp_connection_t *tc;
2676 tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
2678 if (tc->state != TCP_STATE_TIME_WAIT)
2680 error = TCP_ERROR_CREATE_EXISTS;
2684 if (PREDICT_FALSE (!syn_during_timewait (tc, b[0], &tw_iss)))
2686 /* This SYN can't be accepted */
2687 error = TCP_ERROR_CREATE_EXISTS;
2691 lc = tcp_lookup_listener (b[0], tc->c_fib_index, is_ip4);
2692 /* clean up the old session */
2693 tcp_connection_del (tc);
2694 /* listener was cleaned up */
2697 error = TCP_ERROR_NO_LISTENER;
2702 /* Make sure connection wasn't just created */
2704 tcp_lookup_connection (lc->c_fib_index, b[0], thread_index, is_ip4);
2705 if (PREDICT_FALSE (child->state != TCP_STATE_LISTEN))
2707 error = TCP_ERROR_CREATE_EXISTS;
2711 /* Create child session. For syn-flood protection use filter */
2713 /* 1. first check for an RST: handled by input dispatch */
2715 /* 2. second check for an ACK: handled by input dispatch */
2717 /* 3. check for a SYN (did that already) */
2719 /* Create child session and send SYN-ACK */
2720 child = tcp_connection_alloc (thread_index);
2722 if (tcp_options_parse (tcp_buffer_hdr (b[0]), &child->rcv_opts, 1))
2724 error = TCP_ERROR_OPTIONS;
2725 tcp_connection_free (child);
2729 tcp_init_w_buffer (child, b[0], is_ip4);
2731 child->state = TCP_STATE_SYN_RCVD;
2732 child->c_fib_index = lc->c_fib_index;
2733 child->cc_algo = lc->cc_algo;
2735 /* In the regular case, the tw_iss will be zero, but
2736 * in the special case of syn arriving in time_wait state, the value
2737 * will be set according to rfc 1122
2739 child->iss = tw_iss;
2740 tcp_connection_init_vars (child);
2741 child->rto = TCP_RTO_MIN;
2744 * This initializes elog track, must be done before synack.
2745 * We also do it before possible tcp_connection_cleanup() as it
2746 * generates TCP_EVT_DELETE event.
2748 TCP_EVT (TCP_EVT_SYN_RCVD, child, 1);
2750 if (session_stream_accept (&child->connection, lc->c_s_index,
2751 lc->c_thread_index, 0 /* notify */ ))
2753 tcp_connection_cleanup (child);
2754 error = TCP_ERROR_CREATE_SESSION_FAIL;
2758 transport_fifos_init_ooo (&child->connection);
2759 child->tx_fifo_size = transport_tx_fifo_size (&child->connection);
2761 tcp_send_synack (child);
2767 n_syns += (error == TCP_ERROR_NONE);
2770 tcp_inc_counter (listen, TCP_ERROR_SYNS_RCVD, n_syns);
2771 vlib_buffer_free (vm, from, frame->n_vectors);
2773 return frame->n_vectors;
2776 VLIB_NODE_FN (tcp4_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2777 vlib_frame_t * from_frame)
2779 return tcp46_listen_inline (vm, node, from_frame, 1 /* is_ip4 */ );
2782 VLIB_NODE_FN (tcp6_listen_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2783 vlib_frame_t * from_frame)
2785 return tcp46_listen_inline (vm, node, from_frame, 0 /* is_ip4 */ );
2789 VLIB_REGISTER_NODE (tcp4_listen_node) =
2791 .name = "tcp4-listen",
2792 /* Takes a vector of packets. */
2793 .vector_size = sizeof (u32),
2794 .n_errors = TCP_N_ERROR,
2795 .error_counters = tcp_input_error_counters,
2796 .n_next_nodes = TCP_LISTEN_N_NEXT,
2799 #define _(s,n) [TCP_LISTEN_NEXT_##s] = n,
2800 foreach_tcp_state_next
2803 .format_trace = format_tcp_rx_trace_short,
2808 VLIB_REGISTER_NODE (tcp6_listen_node) =
2810 .name = "tcp6-listen",
2811 /* Takes a vector of packets. */
2812 .vector_size = sizeof (u32),
2813 .n_errors = TCP_N_ERROR,
2814 .error_counters = tcp_input_error_counters,
2815 .n_next_nodes = TCP_LISTEN_N_NEXT,
2818 #define _(s,n) [TCP_LISTEN_NEXT_##s] = n,
2819 foreach_tcp_state_next
2822 .format_trace = format_tcp_rx_trace_short,
2826 typedef enum _tcp_input_next
2828 TCP_INPUT_NEXT_DROP,
2829 TCP_INPUT_NEXT_LISTEN,
2830 TCP_INPUT_NEXT_RCV_PROCESS,
2831 TCP_INPUT_NEXT_SYN_SENT,
2832 TCP_INPUT_NEXT_ESTABLISHED,
2833 TCP_INPUT_NEXT_RESET,
2834 TCP_INPUT_NEXT_PUNT,
2838 #define foreach_tcp4_input_next \
2839 _ (DROP, "ip4-drop") \
2840 _ (LISTEN, "tcp4-listen") \
2841 _ (RCV_PROCESS, "tcp4-rcv-process") \
2842 _ (SYN_SENT, "tcp4-syn-sent") \
2843 _ (ESTABLISHED, "tcp4-established") \
2844 _ (RESET, "tcp4-reset") \
2845 _ (PUNT, "ip4-punt")
2847 #define foreach_tcp6_input_next \
2848 _ (DROP, "ip6-drop") \
2849 _ (LISTEN, "tcp6-listen") \
2850 _ (RCV_PROCESS, "tcp6-rcv-process") \
2851 _ (SYN_SENT, "tcp6-syn-sent") \
2852 _ (ESTABLISHED, "tcp6-established") \
2853 _ (RESET, "tcp6-reset") \
2854 _ (PUNT, "ip6-punt")
2856 #define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)
2859 tcp_input_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
2860 vlib_buffer_t ** bs, u32 n_bufs, u8 is_ip4)
2862 tcp_connection_t *tc;
2867 for (i = 0; i < n_bufs; i++)
2869 if (bs[i]->flags & VLIB_BUFFER_IS_TRACED)
2871 t = vlib_add_trace (vm, node, bs[i], sizeof (*t));
2872 tc = tcp_connection_get (vnet_buffer (bs[i])->tcp.connection_index,
2874 tcp = vlib_buffer_get_current (bs[i]);
2875 tcp_set_rx_trace_data (t, tc, tcp, bs[i], is_ip4);
2881 tcp_input_set_error_next (tcp_main_t * tm, u16 * next, u32 * error, u8 is_ip4)
2883 if (*error == TCP_ERROR_FILTERED || *error == TCP_ERROR_WRONG_THREAD)
2885 *next = TCP_INPUT_NEXT_DROP;
2887 else if ((is_ip4 && tm->punt_unknown4) || (!is_ip4 && tm->punt_unknown6))
2889 *next = TCP_INPUT_NEXT_PUNT;
2890 *error = TCP_ERROR_PUNT;
2894 *next = TCP_INPUT_NEXT_RESET;
2895 *error = TCP_ERROR_NO_LISTENER;
2900 tcp_input_dispatch_buffer (tcp_main_t * tm, tcp_connection_t * tc,
2901 vlib_buffer_t * b, u16 * next,
2902 vlib_node_runtime_t * error_node)
2908 tcp = tcp_buffer_hdr (b);
2909 flags = tcp->flags & filter_flags;
2910 *next = tm->dispatch_table[tc->state][flags].next;
2911 error = tm->dispatch_table[tc->state][flags].error;
2914 /* Track connection state when packet was received. It is required
2915 * for @ref tcp46_listen_inline to detect whether we reached
2916 * the node as a result of a SYN packet received while in time-wait
2917 * state. In this case the connection_index in vnet buffer will point
2918 * to the existing tcp connection and not the listener
2920 vnet_buffer (b)->tcp.flags = tc->state;
2922 if (PREDICT_FALSE (error != TCP_ERROR_NONE))
2924 b->error = error_node->errors[error];
2925 if (error == TCP_ERROR_DISPATCH)
2926 clib_warning ("tcp conn %u disp error state %U flags %U",
2927 tc->c_c_index, format_tcp_state, tc->state,
2928 format_tcp_flags, (int) flags);
2933 tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
2934 vlib_frame_t * frame, int is_ip4, u8 is_nolookup)
2936 u32 n_left_from, *from, thread_index = vm->thread_index;
2937 tcp_main_t *tm = vnet_get_tcp_main ();
2938 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2939 u16 nexts[VLIB_FRAME_SIZE], *next;
2941 tcp_update_time_now (tcp_get_worker (thread_index));
2943 from = vlib_frame_vector_args (frame);
2944 n_left_from = frame->n_vectors;
2945 vlib_get_buffers (vm, from, bufs, n_left_from);
2950 while (n_left_from >= 4)
2952 u32 error0 = TCP_ERROR_NO_LISTENER, error1 = TCP_ERROR_NO_LISTENER;
2953 tcp_connection_t *tc0, *tc1;
2956 vlib_prefetch_buffer_header (b[2], STORE);
2957 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2959 vlib_prefetch_buffer_header (b[3], STORE);
2960 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
2963 next[0] = next[1] = TCP_INPUT_NEXT_DROP;
2965 tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
2967 tc1 = tcp_input_lookup_buffer (b[1], thread_index, &error1, is_ip4,
2970 if (PREDICT_TRUE (!tc0 + !tc1 == 0))
2972 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2973 ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1])));
2975 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2976 vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
2978 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2979 tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
2983 if (PREDICT_TRUE (tc0 != 0))
2985 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
2986 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
2987 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
2991 tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
2992 b[0]->error = node->errors[error0];
2995 if (PREDICT_TRUE (tc1 != 0))
2997 ASSERT (tcp_lookup_is_valid (tc1, b[1], tcp_buffer_hdr (b[1])));
2998 vnet_buffer (b[1])->tcp.connection_index = tc1->c_c_index;
2999 tcp_input_dispatch_buffer (tm, tc1, b[1], &next[1], node);
3003 tcp_input_set_error_next (tm, &next[1], &error1, is_ip4);
3004 b[1]->error = node->errors[error1];
3012 while (n_left_from > 0)
3014 tcp_connection_t *tc0;
3015 u32 error0 = TCP_ERROR_NO_LISTENER;
3017 if (n_left_from > 1)
3019 vlib_prefetch_buffer_header (b[1], STORE);
3020 CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
3023 next[0] = TCP_INPUT_NEXT_DROP;
3024 tc0 = tcp_input_lookup_buffer (b[0], thread_index, &error0, is_ip4,
3026 if (PREDICT_TRUE (tc0 != 0))
3028 ASSERT (tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0])));
3029 vnet_buffer (b[0])->tcp.connection_index = tc0->c_c_index;
3030 tcp_input_dispatch_buffer (tm, tc0, b[0], &next[0], node);
3034 tcp_input_set_error_next (tm, &next[0], &error0, is_ip4);
3035 b[0]->error = node->errors[error0];
3043 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
3044 tcp_input_trace_frame (vm, node, bufs, frame->n_vectors, is_ip4);
3046 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
3047 return frame->n_vectors;
3050 VLIB_NODE_FN (tcp4_input_nolookup_node) (vlib_main_t * vm,
3051 vlib_node_runtime_t * node,
3052 vlib_frame_t * from_frame)
3054 return tcp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ ,
3055 1 /* is_nolookup */ );
3058 VLIB_NODE_FN (tcp6_input_nolookup_node) (vlib_main_t * vm,
3059 vlib_node_runtime_t * node,
3060 vlib_frame_t * from_frame)
3062 return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
3063 1 /* is_nolookup */ );
3067 VLIB_REGISTER_NODE (tcp4_input_nolookup_node) =
3069 .name = "tcp4-input-nolookup",
3070 /* Takes a vector of packets. */
3071 .vector_size = sizeof (u32),
3072 .n_errors = TCP_N_ERROR,
3073 .error_counters = tcp_input_error_counters,
3074 .n_next_nodes = TCP_INPUT_N_NEXT,
3077 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3078 foreach_tcp4_input_next
3081 .format_buffer = format_tcp_header,
3082 .format_trace = format_tcp_rx_trace,
3087 VLIB_REGISTER_NODE (tcp6_input_nolookup_node) =
3089 .name = "tcp6-input-nolookup",
3090 /* Takes a vector of packets. */
3091 .vector_size = sizeof (u32),
3092 .n_errors = TCP_N_ERROR,
3093 .error_counters = tcp_input_error_counters,
3094 .n_next_nodes = TCP_INPUT_N_NEXT,
3097 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3098 foreach_tcp6_input_next
3101 .format_buffer = format_tcp_header,
3102 .format_trace = format_tcp_rx_trace,
3106 VLIB_NODE_FN (tcp4_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, 1 /* is_ip4 */ ,
3110 0 /* is_nolookup */ );
3113 VLIB_NODE_FN (tcp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
3114 vlib_frame_t * from_frame)
3116 return tcp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ ,
3117 0 /* is_nolookup */ );
3121 VLIB_REGISTER_NODE (tcp4_input_node) =
3123 .name = "tcp4-input",
3124 /* Takes a vector of packets. */
3125 .vector_size = sizeof (u32),
3126 .n_errors = TCP_N_ERROR,
3127 .error_counters = tcp_input_error_counters,
3128 .n_next_nodes = TCP_INPUT_N_NEXT,
3131 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3132 foreach_tcp4_input_next
3135 .format_buffer = format_tcp_header,
3136 .format_trace = format_tcp_rx_trace,
3141 VLIB_REGISTER_NODE (tcp6_input_node) =
3143 .name = "tcp6-input",
3144 /* Takes a vector of packets. */
3145 .vector_size = sizeof (u32),
3146 .n_errors = TCP_N_ERROR,
3147 .error_counters = tcp_input_error_counters,
3148 .n_next_nodes = TCP_INPUT_N_NEXT,
3151 #define _(s,n) [TCP_INPUT_NEXT_##s] = n,
3152 foreach_tcp6_input_next
3155 .format_buffer = format_tcp_header,
3156 .format_trace = format_tcp_rx_trace,
3160 #ifndef CLIB_MARCH_VARIANT
3162 tcp_check_gso (tcp_connection_t *tc)
3164 tcp_check_tx_offload (tc, tc->c_is_ip4);
3168 tcp_dispatch_table_init (tcp_main_t * tm)
3171 for (i = 0; i < ARRAY_LEN (tm->dispatch_table); i++)
3172 for (j = 0; j < ARRAY_LEN (tm->dispatch_table[i]); j++)
3174 tm->dispatch_table[i][j].next = TCP_INPUT_NEXT_DROP;
3175 tm->dispatch_table[i][j].error = TCP_ERROR_DISPATCH;
3178 #define _(t,f,n,e) \
3180 tm->dispatch_table[TCP_STATE_##t][f].next = (n); \
3181 tm->dispatch_table[TCP_STATE_##t][f].error = (e); \
3184 /* RFC 793: In LISTEN if RST drop and if ACK return RST */
3185 _(LISTEN, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3186 _(LISTEN, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_ACK_INVALID);
3187 _(LISTEN, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_INVALID_CONNECTION);
3188 _(LISTEN, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
3189 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3190 TCP_ERROR_ACK_INVALID);
3191 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3192 TCP_ERROR_SEGMENT_INVALID);
3193 _(LISTEN, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3194 TCP_ERROR_SEGMENT_INVALID);
3195 _(LISTEN, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3196 TCP_ERROR_INVALID_CONNECTION);
3197 _(LISTEN, TCP_FLAG_FIN, TCP_INPUT_NEXT_RESET, TCP_ERROR_SEGMENT_INVALID);
3198 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3199 TCP_ERROR_SEGMENT_INVALID);
3200 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3201 TCP_ERROR_SEGMENT_INVALID);
3202 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3203 TCP_ERROR_SEGMENT_INVALID);
3204 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_DROP,
3205 TCP_ERROR_SEGMENT_INVALID);
3206 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3207 TCP_ERROR_SEGMENT_INVALID);
3208 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_DROP,
3209 TCP_ERROR_SEGMENT_INVALID);
3210 _(LISTEN, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3211 TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3212 /* ACK for for a SYN-ACK -> tcp-rcv-process. */
3213 _(SYN_RCVD, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3214 _(SYN_RCVD, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3215 _(SYN_RCVD, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3217 _(SYN_RCVD, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3218 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3220 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3222 _(SYN_RCVD, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3223 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3224 _(SYN_RCVD, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3225 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3227 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3229 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3230 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3231 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3233 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3234 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3235 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3236 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3237 _(SYN_RCVD, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3238 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3239 _(SYN_RCVD, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3240 /* SYN-ACK for a SYN */
3241 _(SYN_SENT, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3243 _(SYN_SENT, TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3244 _(SYN_SENT, TCP_FLAG_RST, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3245 _(SYN_SENT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3247 _(SYN_SENT, TCP_FLAG_FIN, TCP_INPUT_NEXT_SYN_SENT, TCP_ERROR_NONE);
3248 _(SYN_SENT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_SYN_SENT,
3250 /* ACK for for established connection -> tcp-established. */
3251 _(ESTABLISHED, TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3252 /* FIN for for established connection -> tcp-established. */
3253 _(ESTABLISHED, TCP_FLAG_FIN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3254 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3256 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
3258 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3259 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3260 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED,
3262 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3263 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3264 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3265 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3266 _(ESTABLISHED, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3267 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3268 _(ESTABLISHED, TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3269 _(ESTABLISHED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3271 _(ESTABLISHED, TCP_FLAG_SYN, TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3272 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_ESTABLISHED,
3274 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_ESTABLISHED,
3276 _(ESTABLISHED, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3277 TCP_INPUT_NEXT_ESTABLISHED, TCP_ERROR_NONE);
3278 _(ESTABLISHED, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3279 /* ACK or FIN-ACK to our FIN */
3280 _(FIN_WAIT_1, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3281 _(FIN_WAIT_1, TCP_FLAG_ACK | TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS,
3283 /* FIN in reply to our FIN from the other side */
3284 _(FIN_WAIT_1, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3285 _(FIN_WAIT_1, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3286 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3288 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3289 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3290 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3291 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3292 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3293 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3294 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3296 _(FIN_WAIT_1, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3297 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3298 _(FIN_WAIT_1, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3299 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3301 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3303 _(FIN_WAIT_1, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3304 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3305 _(FIN_WAIT_1, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3306 _(FIN_WAIT_1, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3308 _(CLOSING, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3309 _(CLOSING, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3310 _(CLOSING, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3311 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3313 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3315 _(CLOSING, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3316 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3317 _(CLOSING, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3318 _(CLOSING, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3320 _(CLOSING, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3321 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3323 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3325 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3326 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3327 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3329 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3330 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3331 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3332 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3333 _(CLOSING, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3334 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3335 /* FIN confirming that the peer (app) has closed */
3336 _(FIN_WAIT_2, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3337 _(FIN_WAIT_2, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3338 _(FIN_WAIT_2, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3340 _(FIN_WAIT_2, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3341 _(FIN_WAIT_2, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3343 _(FIN_WAIT_2, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3344 _(CLOSE_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3345 _(CLOSE_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3347 _(CLOSE_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3348 _(CLOSE_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3350 _(CLOSE_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3351 _(LAST_ACK, 0, TCP_INPUT_NEXT_DROP, TCP_ERROR_SEGMENT_INVALID);
3352 _(LAST_ACK, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3353 _(LAST_ACK, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3354 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3356 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS,
3358 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_ACK,
3359 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3360 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3362 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_ACK,
3363 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3364 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST,
3365 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3366 _(LAST_ACK, TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3367 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3368 _(LAST_ACK, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3369 _(LAST_ACK, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3371 _(LAST_ACK, TCP_FLAG_SYN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3372 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3374 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS,
3376 _(LAST_ACK, TCP_FLAG_SYN | TCP_FLAG_RST | TCP_FLAG_ACK,
3377 TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3378 _(TIME_WAIT, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
3379 _(TIME_WAIT, TCP_FLAG_FIN, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3380 _(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3382 _(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3383 _(TIME_WAIT, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
3385 _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
3386 /* RFC793 CLOSED: An incoming segment containing a RST is discarded. An
3387 * incoming segment not containing a RST causes a RST to be sent in
3389 _(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
3390 _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
3391 TCP_ERROR_CONNECTION_CLOSED);
3392 _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
3393 _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
3394 _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
3395 TCP_ERROR_CONNECTION_CLOSED);
3399 static clib_error_t *
3400 tcp_input_init (vlib_main_t * vm)
3402 clib_error_t *error = 0;
3403 tcp_main_t *tm = vnet_get_tcp_main ();
3405 if ((error = vlib_call_init_function (vm, tcp_init)))
3408 /* Initialize dispatch table. */
3409 tcp_dispatch_table_init (tm);
3414 VLIB_INIT_FUNCTION (tcp_input_init);
3416 #endif /* CLIB_MARCH_VARIANT */
3419 * fd.io coding-style-patch-verification: ON
3422 * eval: (c-set-style "gnu")