FreeBSD/Linux Kernel Cross Reference
sys/netiso/tp_inet.c
1 /* $NetBSD: tp_inet.c,v 1.28 2005/02/26 22:39:49 perry Exp $ */
2
3 /*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)tp_inet.c 8.1 (Berkeley) 6/10/93
32 */
33
34 /***********************************************************
35 Copyright IBM Corporation 1987
36
37 All Rights Reserved
38
39 Permission to use, copy, modify, and distribute this software and its
40 documentation for any purpose and without fee is hereby granted,
41 provided that the above copyright notice appear in all copies and that
42 both that copyright notice and this permission notice appear in
43 supporting documentation, and that the name of IBM not be
44 used in advertising or publicity pertaining to distribution of the
45 software without specific, written prior permission.
46
47 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
48 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
49 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
50 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
51 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
52 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 SOFTWARE.
54
55 ******************************************************************/
56
57 /*
58 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
59 */
60 /*
61 * Here is where you find the inet-dependent code. We've tried keep all
62 * net-level and (primarily) address-family-dependent stuff out of the tp
63 * source, and everthing here is reached indirectly through a switch table
64 * (struct nl_protosw *) tpcb->tp_nlproto (see tp_pcb.c). The routines here
65 * are: in_getsufx: gets transport suffix out of an inpcb structure.
66 * in_putsufx: put transport suffix into an inpcb structure. in_putnetaddr:
67 * put a whole net addr into an inpcb. in_getnetaddr: get a whole net addr
68 * from an inpcb. in_cmpnetaddr: compare a whole net addr from an isopcb.
69 * in_recycle_suffix: clear suffix for reuse in inpcb tpip_mtu: figure out
70 * what size tpdu to use tpip_input: take a pkt from ip, strip off its ip
71 * header, give to tp tpip_output_dg: package a pkt for ip given 2 addresses
72 * & some data tpip_output: package a pkt for ip given an inpcb & some data
73 */
74
75 #include <sys/cdefs.h>
76 __KERNEL_RCSID(0, "$NetBSD: tp_inet.c,v 1.28 2005/02/26 22:39:49 perry Exp $");
77
78 #include "opt_inet.h"
79 #include "opt_iso.h"
80
81 #ifdef INET
82
83 #include <sys/param.h>
84 #include <sys/socket.h>
85 #include <sys/socketvar.h>
86 #include <sys/mbuf.h>
87 #include <sys/errno.h>
88 #include <sys/time.h>
89 #include <sys/systm.h>
90
91 #include <net/if.h>
92
93 #include <netiso/tp_param.h>
94 #include <netiso/argo_debug.h>
95 #include <netiso/tp_stat.h>
96 #include <netiso/tp_ip.h>
97 #include <netiso/tp_pcb.h>
98 #include <netiso/tp_trace.h>
99 #include <netiso/tp_stat.h>
100 #include <netiso/tp_tpdu.h>
101 #include <netiso/tp_var.h>
102 #include <netinet/in_var.h>
103
104 #ifndef ISO
105 #include <netiso/iso_chksum.c>
106 #endif
107
108 #include <machine/stdarg.h>
109
110 /*
111 * NAME: in_getsufx()
112 *
113 * CALLED FROM: pr_usrreq() on PRU_BIND,
114 * PRU_CONNECT, PRU_ACCEPT, and PRU_PEERADDR
115 *
116 * FUNCTION, ARGUMENTS, and RETURN VALUE:
117 * Get a transport suffix from an inpcb structure (inp).
118 * The argument (which) takes the value TP_LOCAL or TP_FOREIGN.
119 *
120 * RETURNS: internet port / transport suffix
121 * (CAST TO AN INT)
122 *
123 * SIDE EFFECTS:
124 *
125 * NOTES:
126 */
127 void
128 in_getsufx(void *v, u_short *lenp, caddr_t data_out, int which)
129 {
130 struct inpcb *inp = v;
131 *lenp = sizeof(u_short);
132 switch (which) {
133 case TP_LOCAL:
134 *(u_short *) data_out = inp->inp_lport;
135 return;
136
137 case TP_FOREIGN:
138 *(u_short *) data_out = inp->inp_fport;
139 }
140
141 }
142
143 /*
144 * NAME: in_putsufx()
145 *
146 * CALLED FROM: tp_newsocket(); i.e., when a connection
147 * is being established by an incoming CR_TPDU.
148 *
149 * FUNCTION, ARGUMENTS:
150 * Put a transport suffix (found in name) into an inpcb structure (inp).
151 * The argument (which) takes the value TP_LOCAL or TP_FOREIGN.
152 *
153 * RETURNS: Nada
154 *
155 * SIDE EFFECTS:
156 *
157 * NOTES:
158 */
159 /* ARGSUSED */
160 void
161 in_putsufx(void *v, caddr_t sufxloc, int sufxlen, int which)
162 {
163 struct inpcb *inp = v;
164 if (which == TP_FOREIGN) {
165 bcopy(sufxloc, (caddr_t) & inp->inp_fport, sizeof(inp->inp_fport));
166 }
167 }
168
169 /*
170 * NAME: in_recycle_tsuffix()
171 *
172 * CALLED FROM: tp.trans whenever we go into REFWAIT state.
173 *
174 * FUNCTION and ARGUMENT:
175 * Called when a ref is frozen, to allow the suffix to be reused.
176 * (inp) is the net level pcb.
177 *
178 * RETURNS: Nada
179 *
180 * SIDE EFFECTS:
181 *
182 * NOTES: This really shouldn't have to be done in a NET level pcb
183 * but... for the internet world that just the way it is done in BSD...
184 * The alternative is to have the port unusable until the reference
185 * timer goes off.
186 */
187 void
188 in_recycle_tsuffix(void *v)
189 {
190 struct inpcb *inp = v;
191 inp->inp_fport = inp->inp_lport = 0;
192 }
193
194 /*
195 * NAME: in_putnetaddr()
196 *
197 * CALLED FROM:
198 * tp_newsocket(); i.e., when a connection is being established by an
199 * incoming CR_TPDU.
200 *
201 * FUNCTION and ARGUMENTS:
202 * Copy a whole net addr from a struct sockaddr (name).
203 * into an inpcb (inp).
204 * The argument (which) takes values TP_LOCAL or TP_FOREIGN
205 *
206 * RETURNS: Nada
207 *
208 * SIDE EFFECTS:
209 *
210 * NOTES:
211 */
212 void
213 in_putnetaddr(void *v, struct sockaddr *nm, int which)
214 {
215 struct inpcb *inp = v;
216 struct sockaddr_in *name = (struct sockaddr_in *) nm;
217 switch (which) {
218 case TP_LOCAL:
219 bcopy((caddr_t) & name->sin_addr,
220 (caddr_t) & inp->inp_laddr, sizeof(struct in_addr));
221 /* won't work if the dst address (name) is INADDR_ANY */
222
223 break;
224 case TP_FOREIGN:
225 if (name != (struct sockaddr_in *) 0) {
226 bcopy((caddr_t) & name->sin_addr,
227 (caddr_t) & inp->inp_faddr, sizeof(struct in_addr));
228 }
229 }
230 }
231
232 /*
233 * NAME: in_cmpnetaddr()
234 *
235 * CALLED FROM:
236 * tp_input() when a connection is being established by an
237 * incoming CR_TPDU, and considered for interception.
238 *
239 * FUNCTION and ARGUMENTS:
240 * Compare a whole net addr from a struct sockaddr (name),
241 * with that implicitly stored in an inpcb (inp).
242 * The argument (which) takes values TP_LOCAL or TP_FOREIGN
243 *
244 * RETURNS: Nada
245 *
246 * SIDE EFFECTS:
247 *
248 * NOTES:
249 */
250 int
251 in_cmpnetaddr(void *v, struct sockaddr *nm, int which)
252 {
253 struct inpcb *inp = v;
254 struct sockaddr_in *name = (struct sockaddr_in *) nm;
255 if (which == TP_LOCAL) {
256 if (name->sin_port && name->sin_port != inp->inp_lport)
257 return 0;
258 return (name->sin_addr.s_addr == inp->inp_laddr.s_addr);
259 }
260 if (name->sin_port && name->sin_port != inp->inp_fport)
261 return 0;
262 return (name->sin_addr.s_addr == inp->inp_faddr.s_addr);
263 }
264
265 /*
266 * NAME: in_getnetaddr()
267 *
268 * CALLED FROM:
269 * pr_usrreq() PRU_SOCKADDR, PRU_ACCEPT, PRU_PEERADDR
270 * FUNCTION and ARGUMENTS:
271 * Copy a whole net addr from an inpcb (inp) into
272 * an mbuf (name);
273 * The argument (which) takes values TP_LOCAL or TP_FOREIGN.
274 *
275 * RETURNS: Nada
276 *
277 * SIDE EFFECTS:
278 *
279 * NOTES:
280 */
281
282 void
283 in_getnetaddr(void *v, struct mbuf *name, int which)
284 {
285 struct inpcb *inp = v;
286 struct sockaddr_in *sin = mtod(name, struct sockaddr_in *);
287 bzero((caddr_t) sin, sizeof(*sin));
288 switch (which) {
289 case TP_LOCAL:
290 sin->sin_addr = inp->inp_laddr;
291 sin->sin_port = inp->inp_lport;
292 break;
293 case TP_FOREIGN:
294 sin->sin_addr = inp->inp_faddr;
295 sin->sin_port = inp->inp_fport;
296 break;
297 default:
298 return;
299 }
300 name->m_len = sin->sin_len = sizeof(*sin);
301 sin->sin_family = AF_INET;
302 }
303
304 /*
305 * NAME: tpip_mtu()
306 *
307 * CALLED FROM:
308 * tp_route_to() on incoming CR, CC, and pr_usrreq() for PRU_CONNECT
309 *
310 * FUNCTION, ARGUMENTS, and RETURN VALUE:
311 *
312 * Perform subnetwork dependent part of determining MTU information.
313 * It appears that setting a double pointer to the rtentry associated with
314 * the destination, and returning the header size for the network protocol
315 * suffices.
316 *
317 * SIDE EFFECTS:
318 * Sets tp_routep pointer in pcb.
319 *
320 * NOTES:
321 */
322 int
323 tpip_mtu(void *v)
324 {
325 struct tp_pcb *tpcb = v;
326 struct inpcb *inp = (struct inpcb *) tpcb->tp_npcb;
327
328 #ifdef ARGO_DEBUG
329 if (argo_debug[D_CONN]) {
330 printf("tpip_mtu(tpcb %p)\n", tpcb);
331 printf("tpip_mtu routing to addr 0x%x\n", inp->inp_faddr.s_addr);
332 }
333 #endif
334 tpcb->tp_routep = &(inp->inp_route.ro_rt);
335 return (sizeof(struct ip));
336
337 }
338
339 /*
340 * NAME: tpip_output()
341 *
342 * CALLED FROM: tp_emit()
343 *
344 * FUNCTION and ARGUMENTS:
345 * Take a packet(m0) from tp and package it so that ip will accept it.
346 * This means prepending space for the ip header and filling in a few
347 * of the fields.
348 * inp is the inpcb structure; datalen is the length of the data in the
349 * mbuf string m0.
350 * RETURNS:
351 * whatever (E*) is returned form the net layer output routine.
352 *
353 * SIDE EFFECTS:
354 *
355 * NOTES:
356 */
357
358 int
359 tpip_output(struct mbuf *m0, ...)
360 {
361 int datalen;
362 struct inpcb *inp;
363 int nochksum;
364 va_list ap;
365
366 va_start(ap, m0);
367 datalen = va_arg(ap, int);
368 inp = va_arg(ap, struct inpcb *);
369 nochksum = va_arg(ap, int);
370 va_end(ap);
371
372 return tpip_output_dg(m0, datalen, &inp->inp_laddr, &inp->inp_faddr,
373 &inp->inp_route, nochksum);
374 }
375
376 /*
377 * NAME: tpip_output_dg()
378 *
379 * CALLED FROM: tp_error_emit()
380 *
381 * FUNCTION and ARGUMENTS:
382 * This is a copy of tpip_output that takes the addresses
383 * instead of a pcb. It's used by the tp_error_emit, when we
384 * don't have an in_pcb with which to call the normal output rtn.
385 *
386 * RETURNS: ENOBUFS or whatever (E*) is
387 * returned form the net layer output routine.
388 *
389 * SIDE EFFECTS:
390 *
391 * NOTES:
392 */
393
394 /* ARGSUSED */
395 int
396 tpip_output_dg(struct mbuf *m0, ...)
397 {
398 int datalen;
399 struct in_addr *laddr, *faddr;
400 struct route *ro;
401 int nochksum;
402 struct mbuf *m;
403 struct ip *ip;
404 int error;
405 va_list ap;
406
407 va_start(ap, m0);
408 datalen = va_arg(ap, int);
409 laddr = va_arg(ap, struct in_addr *);
410 faddr = va_arg(ap, struct in_addr *);
411 ro = va_arg(ap, struct route *);
412 nochksum = va_arg(ap, int);
413 va_end(ap);
414
415 #ifdef ARGO_DEBUG
416 if (argo_debug[D_EMIT]) {
417 printf("tpip_output_dg datalen 0x%x m0 %p\n", datalen, m0);
418 }
419 #endif
420
421
422 MGETHDR(m, M_DONTWAIT, TPMT_IPHDR);
423 if (m == 0) {
424 error = ENOBUFS;
425 goto bad;
426 }
427 m->m_next = m0;
428 MH_ALIGN(m, sizeof(struct ip));
429 m->m_len = sizeof(struct ip);
430
431 ip = mtod(m, struct ip *);
432 bzero((caddr_t) ip, sizeof *ip);
433
434 ip->ip_p = IPPROTO_TP;
435 if (sizeof(struct ip) + datalen > IP_MAXPACKET) {
436 error = EMSGSIZE;
437 goto bad;
438 }
439 m->m_pkthdr.len = sizeof(struct ip) + datalen;
440 ip->ip_len = htons(sizeof(struct ip) + datalen);
441 ip->ip_ttl = MAXTTL;
442 /*
443 * don't know why you need to set ttl; overlay doesn't even make this
444 * available
445 */
446
447 ip->ip_src = *laddr;
448 ip->ip_dst = *faddr;
449
450 IncStat(ts_tpdu_sent);
451 #ifdef ARGO_DEBUG
452 if (argo_debug[D_EMIT]) {
453 dump_mbuf(m, "tpip_output_dg before ip_output\n");
454 }
455 #endif
456
457 error = ip_output(m, (struct mbuf *) 0, ro, IP_ALLOWBROADCAST,
458 (struct ip_moptions *)NULL, (struct socket *)NULL);
459
460 #ifdef ARGO_DEBUG
461 if (argo_debug[D_EMIT]) {
462 printf("tpip_output_dg after ip_output\n");
463 }
464 #endif
465
466 return error;
467
468 bad:
469 m_freem(m);
470 IncStat(ts_send_drop);
471 return error;
472 }
473
474 /*
475 * NAME: tpip_input()
476 *
477 * CALLED FROM:
478 * ip's input routine, indirectly through the protosw.
479 *
480 * FUNCTION and ARGUMENTS:
481 * Take a packet (m) from ip, strip off the ip header and give it to tp
482 *
483 * RETURNS: No return value.
484 *
485 * SIDE EFFECTS:
486 *
487 * NOTES:
488 */
489 void
490 tpip_input(struct mbuf *m, ...)
491 {
492 int iplen;
493 struct sockaddr_in src, dst;
494 struct ip *ip;
495 int s = splsoftnet(), hdrlen;
496 va_list ap;
497
498 va_start(ap, m);
499 iplen = va_arg(ap, int);
500 va_end(ap);
501
502 IncStat(ts_pkt_rcvd);
503
504 /*
505 * IP layer has already pulled up the IP header,
506 * but the first byte after the IP header may not be there,
507 * e.g. if you came in via loopback, so you have to do an
508 * m_pullup to before you can even look to see how much you
509 * really need. The good news is that m_pullup will round
510 * up to almost the next mbuf's worth.
511 */
512
513
514 if ((m = m_pullup(m, iplen + 1)) == NULL)
515 goto discard;
516 CHANGE_MTYPE(m, TPMT_DATA);
517
518 /*
519 * Now pull up the whole tp header:
520 * Unfortunately, there may be IP options to skip past so we
521 * just fetch it as an unsigned char.
522 */
523 hdrlen = iplen + 1 + mtod(m, u_char *)[iplen];
524
525 if (m->m_len < hdrlen) {
526 if ((m = m_pullup(m, hdrlen)) == NULL) {
527 #ifdef ARGO_DEBUG
528 if (argo_debug[D_TPINPUT]) {
529 printf("tp_input, pullup 2!\n");
530 }
531 #endif
532 goto discard;
533 }
534 }
535 /*
536 * cannot use tp_inputprep() here 'cause you don't have quite the
537 * same situation
538 */
539
540 #ifdef ARGO_DEBUG
541 if (argo_debug[D_TPINPUT]) {
542 dump_mbuf(m, "after tpip_input both pullups");
543 }
544 #endif
545 /*
546 * m_pullup may have returned a different mbuf
547 */
548 ip = mtod(m, struct ip *);
549
550 /*
551 * drop the ip header from the front of the mbuf
552 * this is necessary for the tp checksum
553 */
554 m->m_len -= iplen;
555 m->m_data += iplen;
556
557 src.sin_addr = *(struct in_addr *) & (ip->ip_src);
558 src.sin_family = AF_INET;
559 src.sin_len = sizeof(src);
560 dst.sin_addr = *(struct in_addr *) & (ip->ip_dst);
561 dst.sin_family = AF_INET;
562 dst.sin_len = sizeof(dst);
563
564 tp_input(m, sintosa(&src), sintosa(&dst), 0, tpip_output_dg, 0);
565 return;
566
567 discard:
568 #ifdef ARGO_DEBUG
569 if (argo_debug[D_TPINPUT]) {
570 printf("tpip_input DISCARD\n");
571 }
572 #endif
573 #ifdef TPPT
574 if (tp_traceflags[D_TPINPUT]) {
575 tptrace(TPPTmisc, "tpip_input DISCARD m", m, 0, 0, 0);
576 }
577 #endif
578 m_freem(m);
579 IncStat(ts_recv_drop);
580 splx(s);
581 }
582
583
584 #include <sys/protosw.h>
585 #include <netinet/ip_icmp.h>
586
587 /*
588 * NAME: tpin_quench()
589 *
590 * CALLED FROM: tpip_ctlinput()
591 *
592 * FUNCTION and ARGUMENTS: find the tpcb pointer and pass it to tp_quench
593 *
594 * RETURNS: Nada
595 *
596 * SIDE EFFECTS:
597 *
598 * NOTES:
599 */
600
601 void
602 tpin_quench(struct inpcb *inp, int dummy)
603 {
604 tp_quench((struct inpcb *) inp->inp_socket->so_pcb, PRC_QUENCH);
605 }
606
607 /*
608 * NAME: tpip_ctlinput()
609 *
610 * CALLED FROM:
611 * The network layer through the protosw table.
612 *
613 * FUNCTION and ARGUMENTS:
614 * When clnp gets an ICMP msg this gets called.
615 * It either returns an error status to the user or
616 * causes all connections on this address to be aborted
617 * by calling the appropriate xx_notify() routine.
618 * (cmd) is the type of ICMP error.
619 * (sa) the address of the sender
620 *
621 * RETURNS: Nothing
622 *
623 * SIDE EFFECTS:
624 *
625 * NOTES:
626 */
627 void *
628 tpip_ctlinput(int cmd, struct sockaddr *sa, void *dummy)
629 {
630 void (*notify)(struct inpcb *, int);
631 int errno;
632
633 if ((unsigned)cmd >= PRC_NCMDS)
634 return NULL;
635 errno = inetctlerrmap[cmd];
636 switch (cmd) {
637
638 case PRC_QUENCH:
639 notify = tp_quench;
640 break;
641
642 case PRC_ROUTEDEAD:
643 case PRC_HOSTUNREACH:
644 case PRC_UNREACH_NET:
645 case PRC_IFDOWN:
646 case PRC_HOSTDEAD:
647 notify = in_rtchange;
648 break;
649
650 default:
651 /*
652 case PRC_MSGSIZE:
653 case PRC_UNREACH_HOST:
654 case PRC_UNREACH_PROTOCOL:
655 case PRC_UNREACH_PORT:
656 case PRC_UNREACH_NEEDFRAG:
657 case PRC_UNREACH_SRCFAIL:
658 case PRC_REDIRECT_NET:
659 case PRC_REDIRECT_HOST:
660 case PRC_REDIRECT_TOSNET:
661 case PRC_REDIRECT_TOSHOST:
662 case PRC_TIMXCEED_INTRANS:
663 case PRC_TIMXCEED_REASS:
664 case PRC_PARAMPROB:
665 */
666 notify = tpin_abort;
667 break;
668 }
669 in_pcbnotifyall(&tp_inpcb, satosin(sa)->sin_addr, errno, notify);
670 return NULL;
671 }
672
673 /*
674 * NAME: tpin_abort()
675 *
676 * CALLED FROM:
677 * xxx_notify() from tp_ctlinput() when
678 * net level gets some ICMP-equiv. type event.
679 *
680 * FUNCTION and ARGUMENTS:
681 * Cause the connection to be aborted with some sort of error
682 * reason indicating that the network layer caused the abort.
683 * Fakes an ER TPDU so we can go through the driver.
684 *
685 * RETURNS: Nothing
686 *
687 * SIDE EFFECTS:
688 *
689 * NOTES:
690 */
691
692 void
693 tpin_abort(struct inpcb *inp, int n)
694 {
695 struct tp_event e;
696
697 e.ev_number = ER_TPDU;
698 e.TPDU_ATTR(ER).e_reason = ENETRESET;
699 tp_driver((struct tp_pcb *) inp->inp_ppcb, &e);
700 }
701
702 #ifdef ARGO_DEBUG
703 void
704 dump_inaddr(struct sockaddr_in *addr)
705 {
706 printf("INET: port 0x%x; addr 0x%x\n", addr->sin_port, addr->sin_addr.s_addr);
707 }
708 #endif /* ARGO_DEBUG */
709 #endif /* INET */
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