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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
34 * $FreeBSD: releng/5.1/sys/netinet/tcp_timer.c 112009 2003-03-08 22:06:20Z jlemon $
35 */
36
37 #include "opt_inet6.h"
38 #include "opt_tcpdebug.h"
39
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/mbuf.h>
44 #include <sys/mutex.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/sysctl.h>
49 #include <sys/systm.h>
50
51 #include <net/route.h>
52
53 #include <netinet/in.h>
54 #include <netinet/in_pcb.h>
55 #include <netinet/in_systm.h>
56 #ifdef INET6
57 #include <netinet6/in6_pcb.h>
58 #endif
59 #include <netinet/ip_var.h>
60 #include <netinet/tcp.h>
61 #include <netinet/tcp_fsm.h>
62 #include <netinet/tcp_timer.h>
63 #include <netinet/tcp_var.h>
64 #include <netinet/tcpip.h>
65 #ifdef TCPDEBUG
66 #include <netinet/tcp_debug.h>
67 #endif
68
69 static int
70 sysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS)
71 {
72 int error, s, tt;
73
74 tt = *(int *)oidp->oid_arg1;
75 s = (int)((int64_t)tt * 1000 / hz);
76
77 error = sysctl_handle_int(oidp, &s, 0, req);
78 if (error || !req->newptr)
79 return (error);
80
81 tt = (int)((int64_t)s * hz / 1000);
82 if (tt < 1)
83 return (EINVAL);
84
85 *(int *)oidp->oid_arg1 = tt;
86 return (0);
87 }
88
89 int tcp_keepinit;
90 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
91 &tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "");
92
93 int tcp_keepidle;
94 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle, CTLTYPE_INT|CTLFLAG_RW,
95 &tcp_keepidle, 0, sysctl_msec_to_ticks, "I", "");
96
97 int tcp_keepintvl;
98 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl, CTLTYPE_INT|CTLFLAG_RW,
99 &tcp_keepintvl, 0, sysctl_msec_to_ticks, "I", "");
100
101 int tcp_delacktime;
102 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DELACKTIME, delacktime,
103 CTLTYPE_INT|CTLFLAG_RW, &tcp_delacktime, 0, sysctl_msec_to_ticks, "I",
104 "Time before a delayed ACK is sent");
105
106 int tcp_msl;
107 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl, CTLTYPE_INT|CTLFLAG_RW,
108 &tcp_msl, 0, sysctl_msec_to_ticks, "I", "Maximum segment lifetime");
109
110 int tcp_rexmit_min;
111 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_min, CTLTYPE_INT|CTLFLAG_RW,
112 &tcp_rexmit_min, 0, sysctl_msec_to_ticks, "I", "Minimum Retransmission Timeout");
113
114 int tcp_rexmit_slop;
115 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_slop, CTLTYPE_INT|CTLFLAG_RW,
116 &tcp_rexmit_slop, 0, sysctl_msec_to_ticks, "I", "Retransmission Timer Slop");
117
118 static int always_keepalive = 1;
119 SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive, CTLFLAG_RW,
120 &always_keepalive , 0, "Assume SO_KEEPALIVE on all TCP connections");
121
122 static int tcp_keepcnt = TCPTV_KEEPCNT;
123 /* max idle probes */
124 int tcp_maxpersistidle;
125 /* max idle time in persist */
126 int tcp_maxidle;
127
128 /*
129 * Tcp protocol timeout routine called every 500 ms.
130 * Updates timestamps used for TCP
131 * causes finite state machine actions if timers expire.
132 */
133 void
134 tcp_slowtimo()
135 {
136 int s;
137
138 s = splnet();
139 tcp_maxidle = tcp_keepcnt * tcp_keepintvl;
140 splx(s);
141 INP_INFO_WLOCK(&tcbinfo);
142 (void) tcp_timer_2msl_tw(0);
143 INP_INFO_WUNLOCK(&tcbinfo);
144 }
145
146 /*
147 * Cancel all timers for TCP tp.
148 */
149 void
150 tcp_canceltimers(tp)
151 struct tcpcb *tp;
152 {
153 callout_stop(tp->tt_2msl);
154 callout_stop(tp->tt_persist);
155 callout_stop(tp->tt_keep);
156 callout_stop(tp->tt_rexmt);
157 }
158
159 int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
160 { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
161
162 int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
163 { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
164
165 static int tcp_totbackoff = 511; /* sum of tcp_backoff[] */
166
167 /*
168 * TCP timer processing.
169 */
170
171 void
172 tcp_timer_delack(xtp)
173 void *xtp;
174 {
175 struct tcpcb *tp = xtp;
176 int s;
177 struct inpcb *inp;
178
179 s = splnet();
180 INP_INFO_RLOCK(&tcbinfo);
181 inp = tp->t_inpcb;
182 if (!inp) {
183 INP_INFO_RUNLOCK(&tcbinfo);
184 splx(s);
185 return;
186 }
187 INP_LOCK(inp);
188 INP_INFO_RUNLOCK(&tcbinfo);
189 if (callout_pending(tp->tt_delack) || !callout_active(tp->tt_delack)) {
190 INP_UNLOCK(inp);
191 splx(s);
192 return;
193 }
194 callout_deactivate(tp->tt_delack);
195
196 tp->t_flags |= TF_ACKNOW;
197 tcpstat.tcps_delack++;
198 (void) tcp_output(tp);
199 INP_UNLOCK(inp);
200 splx(s);
201 }
202
203 void
204 tcp_timer_2msl(xtp)
205 void *xtp;
206 {
207 struct tcpcb *tp = xtp;
208 int s;
209 struct inpcb *inp;
210 #ifdef TCPDEBUG
211 int ostate;
212
213 ostate = tp->t_state;
214 #endif
215 s = splnet();
216 INP_INFO_WLOCK(&tcbinfo);
217 inp = tp->t_inpcb;
218 if (!inp) {
219 INP_INFO_WUNLOCK(&tcbinfo);
220 splx(s);
221 return;
222 }
223 INP_LOCK(inp);
224 if (callout_pending(tp->tt_2msl) || !callout_active(tp->tt_2msl)) {
225 INP_UNLOCK(tp->t_inpcb);
226 INP_INFO_WUNLOCK(&tcbinfo);
227 splx(s);
228 return;
229 }
230 callout_deactivate(tp->tt_2msl);
231 /*
232 * 2 MSL timeout in shutdown went off. If we're closed but
233 * still waiting for peer to close and connection has been idle
234 * too long, or if 2MSL time is up from TIME_WAIT, delete connection
235 * control block. Otherwise, check again in a bit.
236 */
237 if (tp->t_state != TCPS_TIME_WAIT &&
238 (ticks - tp->t_rcvtime) <= tcp_maxidle)
239 callout_reset(tp->tt_2msl, tcp_keepintvl,
240 tcp_timer_2msl, tp);
241 else
242 tp = tcp_close(tp);
243
244 #ifdef TCPDEBUG
245 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
246 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
247 PRU_SLOWTIMO);
248 #endif
249 if (tp)
250 INP_UNLOCK(inp);
251 INP_INFO_WUNLOCK(&tcbinfo);
252 splx(s);
253 }
254
255 struct twlist {
256 LIST_HEAD(, tcptw) tw_list;
257 struct tcptw tw_tail;
258 };
259 #define TWLIST_NLISTS 2
260 static struct twlist twl_2msl[TWLIST_NLISTS];
261 static struct twlist *tw_2msl_list[] = { &twl_2msl[0], &twl_2msl[1], NULL };
262
263 void
264 tcp_timer_init(void)
265 {
266 int i;
267 struct twlist *twl;
268
269 for (i = 0; i < TWLIST_NLISTS; i++) {
270 twl = &twl_2msl[i];
271 LIST_INIT(&twl->tw_list);
272 LIST_INSERT_HEAD(&twl->tw_list, &twl->tw_tail, tw_2msl);
273 }
274 }
275
276 void
277 tcp_timer_2msl_reset(struct tcptw *tw, int timeo)
278 {
279 int i;
280 struct tcptw *tw_tail;
281
282 if (tw->tw_time != 0)
283 LIST_REMOVE(tw, tw_2msl);
284 tw->tw_time = timeo + ticks;
285 i = timeo > tcp_msl ? 1 : 0;
286 tw_tail = &twl_2msl[i].tw_tail;
287 LIST_INSERT_BEFORE(tw_tail, tw, tw_2msl);
288 }
289
290 void
291 tcp_timer_2msl_stop(struct tcptw *tw)
292 {
293
294 if (tw->tw_time != 0)
295 LIST_REMOVE(tw, tw_2msl);
296 }
297
298 struct tcptw *
299 tcp_timer_2msl_tw(int reuse)
300 {
301 struct tcptw *tw, *tw_tail;
302 struct twlist *twl;
303 int i;
304
305 for (i = 0; i < 2; i++) {
306 twl = tw_2msl_list[i];
307 tw_tail = &twl->tw_tail;
308 for (;;) {
309 tw = LIST_FIRST(&twl->tw_list);
310 if (tw == tw_tail || (!reuse && tw->tw_time > ticks))
311 break;
312 INP_LOCK(tw->tw_inpcb);
313 if (tcp_twclose(tw, reuse) != NULL)
314 return (tw);
315 }
316 }
317 return (NULL);
318 }
319
320 void
321 tcp_timer_keep(xtp)
322 void *xtp;
323 {
324 struct tcpcb *tp = xtp;
325 struct tcptemp *t_template;
326 int s;
327 struct inpcb *inp;
328 #ifdef TCPDEBUG
329 int ostate;
330
331 ostate = tp->t_state;
332 #endif
333 s = splnet();
334 INP_INFO_WLOCK(&tcbinfo);
335 inp = tp->t_inpcb;
336 if (!inp) {
337 INP_INFO_WUNLOCK(&tcbinfo);
338 splx(s);
339 return;
340 }
341 INP_LOCK(inp);
342 if (callout_pending(tp->tt_keep) || !callout_active(tp->tt_keep)) {
343 INP_UNLOCK(inp);
344 INP_INFO_WUNLOCK(&tcbinfo);
345 splx(s);
346 return;
347 }
348 callout_deactivate(tp->tt_keep);
349 /*
350 * Keep-alive timer went off; send something
351 * or drop connection if idle for too long.
352 */
353 tcpstat.tcps_keeptimeo++;
354 if (tp->t_state < TCPS_ESTABLISHED)
355 goto dropit;
356 if ((always_keepalive ||
357 tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) &&
358 tp->t_state <= TCPS_CLOSING) {
359 if ((ticks - tp->t_rcvtime) >= tcp_keepidle + tcp_maxidle)
360 goto dropit;
361 /*
362 * Send a packet designed to force a response
363 * if the peer is up and reachable:
364 * either an ACK if the connection is still alive,
365 * or an RST if the peer has closed the connection
366 * due to timeout or reboot.
367 * Using sequence number tp->snd_una-1
368 * causes the transmitted zero-length segment
369 * to lie outside the receive window;
370 * by the protocol spec, this requires the
371 * correspondent TCP to respond.
372 */
373 tcpstat.tcps_keepprobe++;
374 t_template = tcpip_maketemplate(inp);
375 if (t_template) {
376 tcp_respond(tp, t_template->tt_ipgen,
377 &t_template->tt_t, (struct mbuf *)NULL,
378 tp->rcv_nxt, tp->snd_una - 1, 0);
379 (void) m_free(dtom(t_template));
380 }
381 callout_reset(tp->tt_keep, tcp_keepintvl, tcp_timer_keep, tp);
382 } else
383 callout_reset(tp->tt_keep, tcp_keepidle, tcp_timer_keep, tp);
384
385 #ifdef TCPDEBUG
386 if (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
387 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
388 PRU_SLOWTIMO);
389 #endif
390 INP_UNLOCK(inp);
391 INP_INFO_WUNLOCK(&tcbinfo);
392 splx(s);
393 return;
394
395 dropit:
396 tcpstat.tcps_keepdrops++;
397 tp = tcp_drop(tp, ETIMEDOUT);
398
399 #ifdef TCPDEBUG
400 if (tp && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
401 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
402 PRU_SLOWTIMO);
403 #endif
404 if (tp)
405 INP_UNLOCK(tp->t_inpcb);
406 INP_INFO_WUNLOCK(&tcbinfo);
407 splx(s);
408 }
409
410 void
411 tcp_timer_persist(xtp)
412 void *xtp;
413 {
414 struct tcpcb *tp = xtp;
415 int s;
416 struct inpcb *inp;
417 #ifdef TCPDEBUG
418 int ostate;
419
420 ostate = tp->t_state;
421 #endif
422 s = splnet();
423 INP_INFO_WLOCK(&tcbinfo);
424 inp = tp->t_inpcb;
425 if (!inp) {
426 INP_INFO_WUNLOCK(&tcbinfo);
427 splx(s);
428 return;
429 }
430 INP_LOCK(inp);
431 if (callout_pending(tp->tt_persist) || !callout_active(tp->tt_persist)){
432 INP_UNLOCK(inp);
433 INP_INFO_WUNLOCK(&tcbinfo);
434 splx(s);
435 return;
436 }
437 callout_deactivate(tp->tt_persist);
438 /*
439 * Persistance timer into zero window.
440 * Force a byte to be output, if possible.
441 */
442 tcpstat.tcps_persisttimeo++;
443 /*
444 * Hack: if the peer is dead/unreachable, we do not
445 * time out if the window is closed. After a full
446 * backoff, drop the connection if the idle time
447 * (no responses to probes) reaches the maximum
448 * backoff that we would use if retransmitting.
449 */
450 if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
451 ((ticks - tp->t_rcvtime) >= tcp_maxpersistidle ||
452 (ticks - tp->t_rcvtime) >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
453 tcpstat.tcps_persistdrop++;
454 tp = tcp_drop(tp, ETIMEDOUT);
455 goto out;
456 }
457 tcp_setpersist(tp);
458 tp->t_force = 1;
459 (void) tcp_output(tp);
460 tp->t_force = 0;
461
462 out:
463 #ifdef TCPDEBUG
464 if (tp && tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
465 tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
466 PRU_SLOWTIMO);
467 #endif
468 if (tp)
469 INP_UNLOCK(inp);
470 INP_INFO_WUNLOCK(&tcbinfo);
471 splx(s);
472 }
473
474 void
475 tcp_timer_rexmt(xtp)
476 void *xtp;
477 {
478 struct tcpcb *tp = xtp;
479 int s;
480 int rexmt;
481 int headlocked;
482 struct inpcb *inp;
483 #ifdef TCPDEBUG
484 int ostate;
485
486 ostate = tp->t_state;
487 #endif
488 s = splnet();
489 INP_INFO_WLOCK(&tcbinfo);
490 headlocked = 1;
491 inp = tp->t_inpcb;
492 if (!inp) {
493 INP_INFO_WUNLOCK(&tcbinfo);
494 splx(s);
495 return;
496 }
497 INP_LOCK(inp);
498 if (callout_pending(tp->tt_rexmt) || !callout_active(tp->tt_rexmt)) {
499 INP_UNLOCK(inp);
500 INP_INFO_WUNLOCK(&tcbinfo);
501 splx(s);
502 return;
503 }
504 callout_deactivate(tp->tt_rexmt);
505 /*
506 * Retransmission timer went off. Message has not
507 * been acked within retransmit interval. Back off
508 * to a longer retransmit interval and retransmit one segment.
509 */
510 if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
511 tp->t_rxtshift = TCP_MAXRXTSHIFT;
512 tcpstat.tcps_timeoutdrop++;
513 tp = tcp_drop(tp, tp->t_softerror ?
514 tp->t_softerror : ETIMEDOUT);
515 goto out;
516 }
517 INP_INFO_WUNLOCK(&tcbinfo);
518 headlocked = 0;
519 if (tp->t_rxtshift == 1) {
520 /*
521 * first retransmit; record ssthresh and cwnd so they can
522 * be recovered if this turns out to be a "bad" retransmit.
523 * A retransmit is considered "bad" if an ACK for this
524 * segment is received within RTT/2 interval; the assumption
525 * here is that the ACK was already in flight. See
526 * "On Estimating End-to-End Network Path Properties" by
527 * Allman and Paxson for more details.
528 */
529 tp->snd_cwnd_prev = tp->snd_cwnd;
530 tp->snd_ssthresh_prev = tp->snd_ssthresh;
531 tp->snd_high_prev = tp->snd_high;
532 tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
533 }
534 tcpstat.tcps_rexmttimeo++;
535 if (tp->t_state == TCPS_SYN_SENT)
536 rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift];
537 else
538 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
539 TCPT_RANGESET(tp->t_rxtcur, rexmt,
540 tp->t_rttmin, TCPTV_REXMTMAX);
541 /*
542 * Disable rfc1323 and rfc1644 if we havn't got any response to
543 * our third SYN to work-around some broken terminal servers
544 * (most of which have hopefully been retired) that have bad VJ
545 * header compression code which trashes TCP segments containing
546 * unknown-to-them TCP options.
547 */
548 if ((tp->t_state == TCPS_SYN_SENT) && (tp->t_rxtshift == 3))
549 tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_REQ_CC);
550 /*
551 * If losing, let the lower level know and try for
552 * a better route. Also, if we backed off this far,
553 * our srtt estimate is probably bogus. Clobber it
554 * 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 in_losing(tp->t_inpcb);
565 tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
566 tp->t_srtt = 0;
567 }
568 tp->snd_nxt = tp->snd_una;
569 tp->snd_high = tp->snd_max;
570 /*
571 * Force a segment to be sent.
572 */
573 tp->t_flags |= TF_ACKNOW;
574 /*
575 * If timing a segment in this window, stop the timer.
576 */
577 tp->t_rtttime = 0;
578 /*
579 * Close the congestion window down to one segment
580 * (we'll open it by one segment for each ack we get).
581 * Since we probably have a window's worth of unacked
582 * data accumulated, this "slow start" keeps us from
583 * dumping all that data as back-to-back packets (which
584 * might overwhelm an intermediate gateway).
585 *
586 * There are two phases to the opening: Initially we
587 * open by one mss on each ack. This makes the window
588 * size increase exponentially with time. If the
589 * window is larger than the path can handle, this
590 * exponential growth results in dropped packet(s)
591 * almost immediately. To get more time between
592 * drops but still "push" the network to take advantage
593 * of improving conditions, we switch from exponential
594 * to linear window opening at some threshhold size.
595 * For a threshhold, we use half the current window
596 * size, truncated to a multiple of the mss.
597 *
598 * (the minimum cwnd that will give us exponential
599 * growth is 2 mss. We don't allow the threshhold
600 * to go below this.)
601 */
602 {
603 u_int win = min(tp->snd_wnd, tp->snd_cwnd) / 2 / tp->t_maxseg;
604 if (win < 2)
605 win = 2;
606 tp->snd_cwnd = tp->t_maxseg;
607 tp->snd_ssthresh = win * tp->t_maxseg;
608 tp->t_dupacks = 0;
609 }
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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