1 /*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
30 * $FreeBSD: releng/5.3/sys/netinet/tcp_timer.c 136588 2004-10-16 08:43:07Z cvs2svn $
31 */
32
33 #include "opt_inet6.h"
34 #include "opt_tcpdebug.h"
35 #include "opt_tcp_sack.h"
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/mbuf.h>
41 #include <sys/mutex.h>
42 #include <sys/protosw.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45 #include <sys/sysctl.h>
46 #include <sys/systm.h>
47
48 #include <net/route.h>
49
50 #include <netinet/in.h>
51 #include <netinet/in_pcb.h>
52 #include <netinet/in_systm.h>
53 #ifdef INET6
54 #include <netinet6/in6_pcb.h>
55 #endif
56 #include <netinet/ip_var.h>
57 #include <netinet/tcp.h>
58 #include <netinet/tcp_fsm.h>
59 #include <netinet/tcp_timer.h>
60 #include <netinet/tcp_var.h>
61 #include <netinet/tcpip.h>
62 #ifdef TCPDEBUG
63 #include <netinet/tcp_debug.h>
64 #endif
65
66 static int
67 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
68 {
69 int error, s, tt;
70
71 tt = *(int *)oidp->oid_arg1;
72 s = (int)((int64_t)tt * 1000 / hz);
73
74 error = sysctl_handle_int(oidp, &s, 0, req);
75 if (error || !req->newptr)
76 return (error);
77
78 tt = (int)((int64_t)s * hz / 1000);
79 if (tt < 1)
80 return (EINVAL);
81
82 *(int *)oidp->oid_arg1 = tt;
83 return (0);
84 }
85
86 int tcp_keepinit;
87 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
88 &tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "");
89
90 int tcp_keepidle;
91 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle, CTLTYPE_INT|CTLFLAG_RW,
92 &tcp_keepidle, 0, sysctl_msec_to_ticks, "I", "");
93
94 int tcp_keepintvl;
95 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl, CTLTYPE_INT|CTLFLAG_RW,
96 &tcp_keepintvl, 0, sysctl_msec_to_ticks, "I", "");
97
98 int tcp_delacktime;
99 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DELACKTIME, delacktime,
100 CTLTYPE_INT|CTLFLAG_RW, &tcp_delacktime, 0, sysctl_msec_to_ticks, "I",
101 "Time before a delayed ACK is sent");
102
103 int tcp_msl;
104 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl, CTLTYPE_INT|CTLFLAG_RW,
105 &tcp_msl, 0, sysctl_msec_to_ticks, "I", "Maximum segment lifetime");
106
107 int tcp_rexmit_min;
108 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_min, CTLTYPE_INT|CTLFLAG_RW,
109 &tcp_rexmit_min, 0, sysctl_msec_to_ticks, "I", "Minimum Retransmission Timeout");
110
111 int tcp_rexmit_slop;
112 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_slop, CTLTYPE_INT|CTLFLAG_RW,
113 &tcp_rexmit_slop, 0, sysctl_msec_to_ticks, "I", "Retransmission Timer Slop");
114
115 static int always_keepalive = 1;
116 SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive, CTLFLAG_RW,
117 &always_keepalive , 0, "Assume SO_KEEPALIVE on all TCP connections");
118
119 static int tcp_keepcnt = TCPTV_KEEPCNT;
120 /* max idle probes */
121 int tcp_maxpersistidle;
122 /* max idle time in persist */
123 int tcp_maxidle;
124
125 /*
126 * Tcp protocol timeout routine called every 500 ms.
127 * Updates timestamps used for TCP
128 * causes finite state machine actions if timers expire.
129 */
130 void
131 tcp_slowtimo()
132 {
133 int s;
134
135 s = splnet();
136 tcp_maxidle = tcp_keepcnt * tcp_keepintvl;
137 splx(s);
138 INP_INFO_WLOCK(&tcbinfo);
139 (void) tcp_timer_2msl_tw(0);
140 INP_INFO_WUNLOCK(&tcbinfo);
141 }
142
143 /*
144 * Cancel all timers for TCP tp.
145 */
146 void
147 tcp_canceltimers(tp)
148 struct tcpcb *tp;
149 {
150 callout_stop(tp->tt_2msl);
151 callout_stop(tp->tt_persist);
152 callout_stop(tp->tt_keep);
153 callout_stop(tp->tt_rexmt);
154 }
155
156 int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
157 { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
158
159 int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
160 { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 512, 512, 512 };
161
162 static int tcp_totbackoff = 2559; /* sum of tcp_backoff[] */
163
164 /*
165 * TCP timer processing.
166 */
167
168 void
169 tcp_timer_delack(xtp)
170 void *xtp;
171 {
172 struct tcpcb *tp = xtp;
173 int s;
174 struct inpcb *inp;
175
176 s = splnet();
177 INP_INFO_RLOCK(&tcbinfo);
178 inp = tp->t_inpcb;
179 if (!inp) {
180 INP_INFO_RUNLOCK(&tcbinfo);
181 splx(s);
182 return;
183 }
184 INP_LOCK(inp);
185 INP_INFO_RUNLOCK(&tcbinfo);
186 if (callout_pending(tp->tt_delack) || !callout_active(tp->tt_delack)) {
187 INP_UNLOCK(inp);
188 splx(s);
189 return;
190 }
191 callout_deactivate(tp->tt_delack);
192
193 tp->t_flags |= TF_ACKNOW;
194 tcpstat.tcps_delack++;
195 (void) tcp_output(tp);
196 INP_UNLOCK(inp);
197 splx(s);
198 }
199
200 void
201 tcp_timer_2msl(xtp)
202 void *xtp;
203 {
204 struct tcpcb *tp = xtp;
205 int s;
206 struct inpcb *inp;
207 #ifdef TCPDEBUG
208 int ostate;
209
210 ostate = tp->t_state;
211 #endif
212 s = splnet();
213 INP_INFO_WLOCK(&tcbinfo);
214 inp = tp->t_inpcb;
215 if (!inp) {
216 INP_INFO_WUNLOCK(&tcbinfo);
217 splx(s);
218 return;
219 }
220 INP_LOCK(inp);
221 tcp_free_sackholes(tp);
222 if (callout_pending(tp->tt_2msl) || !callout_active(tp->tt_2msl)) {
223 INP_UNLOCK(tp->t_inpcb);
224 INP_INFO_WUNLOCK(&tcbinfo);
225 splx(s);
226 return;
227 }
228 callout_deactivate(tp->tt_2msl);
229 /*
230 * 2 MSL timeout in shutdown went off. If we're closed but
231 * still waiting for peer to close and connection has been idle
232 * too long, or if 2MSL time is up from TIME_WAIT, delete connection
233 * control block. Otherwise, check again in a bit.
234 */
235 if (tp->t_state != TCPS_TIME_WAIT &&
236 (ticks - tp->t_rcvtime) <= tcp_maxidle)
237 callout_reset(tp->tt_2msl, tcp_keepintvl,
238 tcp_timer_2msl, tp);
239 else
240 tp = tcp_close(tp);
241
242 #ifdef TCPDEBUG
243 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
244 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
245 PRU_SLOWTIMO);
246 #endif
247 if (tp)
248 INP_UNLOCK(inp);
249 INP_INFO_WUNLOCK(&tcbinfo);
250 splx(s);
251 }
252
253 struct twlist {
254 LIST_HEAD(, tcptw) tw_list;
255 struct tcptw tw_tail;
256 };
257 #define TWLIST_NLISTS 2
258 static struct twlist twl_2msl[TWLIST_NLISTS];
259 static struct twlist *tw_2msl_list[] = { &twl_2msl[0], &twl_2msl[1], NULL };
260
261 void
262 tcp_timer_init(void)
263 {
264 int i;
265 struct twlist *twl;
266
267 for (i = 0; i < TWLIST_NLISTS; i++) {
268 twl = &twl_2msl[i];
269 LIST_INIT(&twl->tw_list);
270 LIST_INSERT_HEAD(&twl->tw_list, &twl->tw_tail, tw_2msl);
271 }
272 }
273
274 void
275 tcp_timer_2msl_reset(struct tcptw *tw, int timeo)
276 {
277 int i;
278 struct tcptw *tw_tail;
279
280 if (tw->tw_time != 0)
281 LIST_REMOVE(tw, tw_2msl);
282 tw->tw_time = timeo + ticks;
283 i = timeo > tcp_msl ? 1 : 0;
284 tw_tail = &twl_2msl[i].tw_tail;
285 LIST_INSERT_BEFORE(tw_tail, tw, tw_2msl);
286 }
287
288 void
289 tcp_timer_2msl_stop(struct tcptw *tw)
290 {
291
292 if (tw->tw_time != 0)
293 LIST_REMOVE(tw, tw_2msl);
294 }
295
296 struct tcptw *
297 tcp_timer_2msl_tw(int reuse)
298 {
299 struct tcptw *tw, *tw_tail;
300 struct twlist *twl;
301 int i;
302
303 for (i = 0; i < 2; i++) {
304 twl = tw_2msl_list[i];
305 tw_tail = &twl->tw_tail;
306 for (;;) {
307 tw = LIST_FIRST(&twl->tw_list);
308 if (tw == tw_tail || (!reuse && tw->tw_time > ticks))
309 break;
310 INP_LOCK(tw->tw_inpcb);
311 if (tcp_twclose(tw, reuse) != NULL)
312 return (tw);
313 }
314 }
315 return (NULL);
316 }
317
318 void
319 tcp_timer_keep(xtp)
320 void *xtp;
321 {
322 struct tcpcb *tp = xtp;
323 struct tcptemp *t_template;
324 int s;
325 struct inpcb *inp;
326 #ifdef TCPDEBUG
327 int ostate;
328
329 ostate = tp->t_state;
330 #endif
331 s = splnet();
332 INP_INFO_WLOCK(&tcbinfo);
333 inp = tp->t_inpcb;
334 if (!inp) {
335 INP_INFO_WUNLOCK(&tcbinfo);
336 splx(s);
337 return;
338 }
339 INP_LOCK(inp);
340 if (callout_pending(tp->tt_keep) || !callout_active(tp->tt_keep)) {
341 INP_UNLOCK(inp);
342 INP_INFO_WUNLOCK(&tcbinfo);
343 splx(s);
344 return;
345 }
346 callout_deactivate(tp->tt_keep);
347 /*
348 * Keep-alive timer went off; send something
349 * or drop connection if idle for too long.
350 */
351 tcpstat.tcps_keeptimeo++;
352 if (tp->t_state < TCPS_ESTABLISHED)
353 goto dropit;
354 if ((always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) &&
355 tp->t_state <= TCPS_CLOSING) {
356 if ((ticks - tp->t_rcvtime) >= tcp_keepidle + tcp_maxidle)
357 goto dropit;
358 /*
359 * Send a packet designed to force a response
360 * if the peer is up and reachable:
361 * either an ACK if the connection is still alive,
362 * or an RST if the peer has closed the connection
363 * due to timeout or reboot.
364 * Using sequence number tp->snd_una-1
365 * causes the transmitted zero-length segment
366 * to lie outside the receive window;
367 * by the protocol spec, this requires the
368 * correspondent TCP to respond.
369 */
370 tcpstat.tcps_keepprobe++;
371 t_template = tcpip_maketemplate(inp);
372 if (t_template) {
373 tcp_respond(tp, t_template->tt_ipgen,
374 &t_template->tt_t, (struct mbuf *)NULL,
375 tp->rcv_nxt, tp->snd_una - 1, 0);
376 (void) m_free(dtom(t_template));
377 }
378 callout_reset(tp->tt_keep, tcp_keepintvl, tcp_timer_keep, tp);
379 } else
380 callout_reset(tp->tt_keep, tcp_keepidle, tcp_timer_keep, tp);
381
382 #ifdef TCPDEBUG
383 if (inp->inp_socket->so_options & SO_DEBUG)
384 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
385 PRU_SLOWTIMO);
386 #endif
387 INP_UNLOCK(inp);
388 INP_INFO_WUNLOCK(&tcbinfo);
389 splx(s);
390 return;
391
392 dropit:
393 tcpstat.tcps_keepdrops++;
394 tp = tcp_drop(tp, ETIMEDOUT);
395
396 #ifdef TCPDEBUG
397 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
398 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
399 PRU_SLOWTIMO);
400 #endif
401 if (tp)
402 INP_UNLOCK(tp->t_inpcb);
403 INP_INFO_WUNLOCK(&tcbinfo);
404 splx(s);
405 }
406
407 void
408 tcp_timer_persist(xtp)
409 void *xtp;
410 {
411 struct tcpcb *tp = xtp;
412 int s;
413 struct inpcb *inp;
414 #ifdef TCPDEBUG
415 int ostate;
416
417 ostate = tp->t_state;
418 #endif
419 s = splnet();
420 INP_INFO_WLOCK(&tcbinfo);
421 inp = tp->t_inpcb;
422 if (!inp) {
423 INP_INFO_WUNLOCK(&tcbinfo);
424 splx(s);
425 return;
426 }
427 INP_LOCK(inp);
428 if (callout_pending(tp->tt_persist) || !callout_active(tp->tt_persist)){
429 INP_UNLOCK(inp);
430 INP_INFO_WUNLOCK(&tcbinfo);
431 splx(s);
432 return;
433 }
434 callout_deactivate(tp->tt_persist);
435 /*
436 * Persistance timer into zero window.
437 * Force a byte to be output, if possible.
438 */
439 tcpstat.tcps_persisttimeo++;
440 /*
441 * Hack: if the peer is dead/unreachable, we do not
442 * time out if the window is closed. After a full
443 * backoff, drop the connection if the idle time
444 * (no responses to probes) reaches the maximum
445 * backoff that we would use if retransmitting.
446 */
447 if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
448 ((ticks - tp->t_rcvtime) >= tcp_maxpersistidle ||
449 (ticks - tp->t_rcvtime) >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
450 tcpstat.tcps_persistdrop++;
451 tp = tcp_drop(tp, ETIMEDOUT);
452 goto out;
453 }
454 tcp_setpersist(tp);
455 tp->t_force = 1;
456 (void) tcp_output(tp);
457 tp->t_force = 0;
458
459 out:
460 #ifdef TCPDEBUG
461 if (tp && tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
462 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
463 PRU_SLOWTIMO);
464 #endif
465 if (tp)
466 INP_UNLOCK(inp);
467 INP_INFO_WUNLOCK(&tcbinfo);
468 splx(s);
469 }
470
471 void
472 tcp_timer_rexmt(xtp)
473 void *xtp;
474 {
475 struct tcpcb *tp = xtp;
476 int s;
477 int rexmt;
478 int headlocked;
479 struct inpcb *inp;
480 #ifdef TCPDEBUG
481 int ostate;
482
483 ostate = tp->t_state;
484 #endif
485 s = splnet();
486 INP_INFO_WLOCK(&tcbinfo);
487 headlocked = 1;
488 inp = tp->t_inpcb;
489 if (!inp) {
490 INP_INFO_WUNLOCK(&tcbinfo);
491 splx(s);
492 return;
493 }
494 INP_LOCK(inp);
495 if (callout_pending(tp->tt_rexmt) || !callout_active(tp->tt_rexmt)) {
496 INP_UNLOCK(inp);
497 INP_INFO_WUNLOCK(&tcbinfo);
498 splx(s);
499 return;
500 }
501 callout_deactivate(tp->tt_rexmt);
502 tcp_free_sackholes(tp);
503 /*
504 * Retransmission timer went off. Message has not
505 * been acked within retransmit interval. Back off
506 * to a longer retransmit interval and retransmit one segment.
507 */
508 if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
509 tp->t_rxtshift = TCP_MAXRXTSHIFT;
510 tcpstat.tcps_timeoutdrop++;
511 tp = tcp_drop(tp, tp->t_softerror ?
512 tp->t_softerror : ETIMEDOUT);
513 goto out;
514 }
515 INP_INFO_WUNLOCK(&tcbinfo);
516 headlocked = 0;
517 if (tp->t_rxtshift == 1) {
518 /*
519 * first retransmit; record ssthresh and cwnd so they can
520 * be recovered if this turns out to be a "bad" retransmit.
521 * A retransmit is considered "bad" if an ACK for this
522 * segment is received within RTT/2 interval; the assumption
523 * here is that the ACK was already in flight. See
524 * "On Estimating End-to-End Network Path Properties" by
525 * Allman and Paxson for more details.
526 */
527 tp->snd_cwnd_prev = tp->snd_cwnd;
528 tp->snd_ssthresh_prev = tp->snd_ssthresh;
529 tp->snd_recover_prev = tp->snd_recover;
530 if (IN_FASTRECOVERY(tp))
531 tp->t_flags |= TF_WASFRECOVERY;
532 else
533 tp->t_flags &= ~TF_WASFRECOVERY;
534 tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
535 }
536 tcpstat.tcps_rexmttimeo++;
537 if (tp->t_state == TCPS_SYN_SENT)
538 rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift];
539 else
540 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
541 TCPT_RANGESET(tp->t_rxtcur, rexmt,
542 tp->t_rttmin, TCPTV_REXMTMAX);
543 /*
544 * Disable rfc1323 and rfc1644 if we havn't got any response to
545 * our third SYN to work-around some broken terminal servers
546 * (most of which have hopefully been retired) that have bad VJ
547 * header compression code which trashes TCP segments containing
548 * unknown-to-them TCP options.
549 */
550 if ((tp->t_state == TCPS_SYN_SENT) && (tp->t_rxtshift == 3))
551 tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_REQ_CC);
552 /*
553 * If we backed off this far, our srtt estimate is probably bogus.
554 * Clobber it so we'll take the next rtt measurement as our srtt;
555 * move the current srtt into rttvar to keep the current
556 * retransmit times until then.
557 */
558 if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
559 #ifdef INET6
560 if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0)
561 in6_losing(tp->t_inpcb);
562 else
563 #endif
564 tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
565 tp->t_srtt = 0;
566 }
567 tp->snd_nxt = tp->snd_una;
568 tp->snd_recover = tp->snd_max;
569 /*
570 * Force a segment to be sent.
571 */
572 tp->t_flags |= TF_ACKNOW;
573 /*
574 * If timing a segment in this window, stop the timer.
575 */
576 tp->t_rtttime = 0;
577 /*
578 * Close the congestion window down to one segment
579 * (we'll open it by one segment for each ack we get).
580 * Since we probably have a window's worth of unacked
581 * data accumulated, this "slow start" keeps us from
582 * dumping all that data as back-to-back packets (which
583 * might overwhelm an intermediate gateway).
584 *
585 * There are two phases to the opening: Initially we
586 * open by one mss on each ack. This makes the window
587 * size increase exponentially with time. If the
588 * window is larger than the path can handle, this
589 * exponential growth results in dropped packet(s)
590 * almost immediately. To get more time between
591 * drops but still "push" the network to take advantage
592 * of improving conditions, we switch from exponential
593 * to linear window opening at some threshhold size.
594 * For a threshhold, we use half the current window
595 * size, truncated to a multiple of the mss.
596 *
597 * (the minimum cwnd that will give us exponential
598 * growth is 2 mss. We don't allow the threshhold
599 * to go below this.)
600 */
601 {
602 u_int win = min(tp->snd_wnd, tp->snd_cwnd) / 2 / tp->t_maxseg;
603 if (win < 2)
604 win = 2;
605 tp->snd_cwnd = tp->t_maxseg;
606 tp->snd_ssthresh = win * tp->t_maxseg;
607 tp->t_dupacks = 0;
608 }
609 EXIT_FASTRECOVERY(tp);
610 (void) tcp_output(tp);
611
612 out:
613 #ifdef TCPDEBUG
614 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
615 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
616 PRU_SLOWTIMO);
617 #endif
618 if (tp)
619 INP_UNLOCK(inp);
620 if (headlocked)
621 INP_INFO_WUNLOCK(&tcbinfo);
622 splx(s);
623 }
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