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8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/sched.h>
12#include <linux/ip.h>
13#include "internal.h"
14#include "afs_cm.h"
15#include "protocol_yfs.h"
16
17static int afs_deliver_cb_init_call_back_state(struct afs_call *);
18static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
19static int afs_deliver_cb_probe(struct afs_call *);
20static int afs_deliver_cb_callback(struct afs_call *);
21static int afs_deliver_cb_probe_uuid(struct afs_call *);
22static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
23static void afs_cm_destructor(struct afs_call *);
24static void SRXAFSCB_CallBack(struct work_struct *);
25static void SRXAFSCB_InitCallBackState(struct work_struct *);
26static void SRXAFSCB_Probe(struct work_struct *);
27static void SRXAFSCB_ProbeUuid(struct work_struct *);
28static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
29
30static int afs_deliver_yfs_cb_callback(struct afs_call *);
31
32#define CM_NAME(name) \
33 char afs_SRXCB##name##_name[] __tracepoint_string = \
34 "CB." #name
35
36
37
38
39static CM_NAME(CallBack);
40static const struct afs_call_type afs_SRXCBCallBack = {
41 .name = afs_SRXCBCallBack_name,
42 .deliver = afs_deliver_cb_callback,
43 .destructor = afs_cm_destructor,
44 .work = SRXAFSCB_CallBack,
45};
46
47
48
49
50static CM_NAME(InitCallBackState);
51static const struct afs_call_type afs_SRXCBInitCallBackState = {
52 .name = afs_SRXCBInitCallBackState_name,
53 .deliver = afs_deliver_cb_init_call_back_state,
54 .destructor = afs_cm_destructor,
55 .work = SRXAFSCB_InitCallBackState,
56};
57
58
59
60
61static CM_NAME(InitCallBackState3);
62static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
63 .name = afs_SRXCBInitCallBackState3_name,
64 .deliver = afs_deliver_cb_init_call_back_state3,
65 .destructor = afs_cm_destructor,
66 .work = SRXAFSCB_InitCallBackState,
67};
68
69
70
71
72static CM_NAME(Probe);
73static const struct afs_call_type afs_SRXCBProbe = {
74 .name = afs_SRXCBProbe_name,
75 .deliver = afs_deliver_cb_probe,
76 .destructor = afs_cm_destructor,
77 .work = SRXAFSCB_Probe,
78};
79
80
81
82
83static CM_NAME(ProbeUuid);
84static const struct afs_call_type afs_SRXCBProbeUuid = {
85 .name = afs_SRXCBProbeUuid_name,
86 .deliver = afs_deliver_cb_probe_uuid,
87 .destructor = afs_cm_destructor,
88 .work = SRXAFSCB_ProbeUuid,
89};
90
91
92
93
94static CM_NAME(TellMeAboutYourself);
95static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
96 .name = afs_SRXCBTellMeAboutYourself_name,
97 .deliver = afs_deliver_cb_tell_me_about_yourself,
98 .destructor = afs_cm_destructor,
99 .work = SRXAFSCB_TellMeAboutYourself,
100};
101
102
103
104
105static CM_NAME(YFS_CallBack);
106static const struct afs_call_type afs_SRXYFSCB_CallBack = {
107 .name = afs_SRXCBYFS_CallBack_name,
108 .deliver = afs_deliver_yfs_cb_callback,
109 .destructor = afs_cm_destructor,
110 .work = SRXAFSCB_CallBack,
111};
112
113
114
115
116
117bool afs_cm_incoming_call(struct afs_call *call)
118{
119 _enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
120
121 call->epoch = rxrpc_kernel_get_epoch(call->net->socket, call->rxcall);
122
123 switch (call->operation_ID) {
124 case CBCallBack:
125 call->type = &afs_SRXCBCallBack;
126 return true;
127 case CBInitCallBackState:
128 call->type = &afs_SRXCBInitCallBackState;
129 return true;
130 case CBInitCallBackState3:
131 call->type = &afs_SRXCBInitCallBackState3;
132 return true;
133 case CBProbe:
134 call->type = &afs_SRXCBProbe;
135 return true;
136 case CBProbeUuid:
137 call->type = &afs_SRXCBProbeUuid;
138 return true;
139 case CBTellMeAboutYourself:
140 call->type = &afs_SRXCBTellMeAboutYourself;
141 return true;
142 case YFSCBCallBack:
143 if (call->service_id != YFS_CM_SERVICE)
144 return false;
145 call->type = &afs_SRXYFSCB_CallBack;
146 return true;
147 default:
148 return false;
149 }
150}
151
152
153
154
155static int afs_record_cm_probe(struct afs_call *call, struct afs_server *server)
156{
157 _enter("");
158
159 if (test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags) &&
160 !test_bit(AFS_SERVER_FL_PROBING, &server->flags)) {
161 if (server->cm_epoch == call->epoch)
162 return 0;
163
164 if (!server->probe.said_rebooted) {
165 pr_notice("kAFS: FS rebooted %pU\n", &server->uuid);
166 server->probe.said_rebooted = true;
167 }
168 }
169
170 spin_lock(&server->probe_lock);
171
172 if (!test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags)) {
173 server->cm_epoch = call->epoch;
174 server->probe.cm_epoch = call->epoch;
175 goto out;
176 }
177
178 if (server->probe.cm_probed &&
179 call->epoch != server->probe.cm_epoch &&
180 !server->probe.said_inconsistent) {
181 pr_notice("kAFS: FS endpoints inconsistent %pU\n",
182 &server->uuid);
183 server->probe.said_inconsistent = true;
184 }
185
186 if (!server->probe.cm_probed || call->epoch == server->cm_epoch)
187 server->probe.cm_epoch = server->cm_epoch;
188
189out:
190 server->probe.cm_probed = true;
191 spin_unlock(&server->probe_lock);
192 return 0;
193}
194
195
196
197
198
199static int afs_find_cm_server_by_peer(struct afs_call *call)
200{
201 struct sockaddr_rxrpc srx;
202 struct afs_server *server;
203
204 rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
205
206 server = afs_find_server(call->net, &srx);
207 if (!server) {
208 trace_afs_cm_no_server(call, &srx);
209 return 0;
210 }
211
212 call->server = server;
213 return afs_record_cm_probe(call, server);
214}
215
216
217
218
219
220static int afs_find_cm_server_by_uuid(struct afs_call *call,
221 struct afs_uuid *uuid)
222{
223 struct afs_server *server;
224
225 rcu_read_lock();
226 server = afs_find_server_by_uuid(call->net, call->request);
227 rcu_read_unlock();
228 if (!server) {
229 trace_afs_cm_no_server_u(call, call->request);
230 return 0;
231 }
232
233 call->server = server;
234 return afs_record_cm_probe(call, server);
235}
236
237
238
239
240static void afs_cm_destructor(struct afs_call *call)
241{
242 kfree(call->buffer);
243 call->buffer = NULL;
244}
245
246
247
248
249static void SRXAFSCB_CallBack(struct work_struct *work)
250{
251 struct afs_call *call = container_of(work, struct afs_call, work);
252
253 _enter("");
254
255
256
257
258
259 if (call->server)
260 afs_break_callbacks(call->server, call->count, call->request);
261
262 afs_send_empty_reply(call);
263 afs_put_call(call);
264 _leave("");
265}
266
267
268
269
270static int afs_deliver_cb_callback(struct afs_call *call)
271{
272 struct afs_callback_break *cb;
273 __be32 *bp;
274 int ret, loop;
275
276 _enter("{%u}", call->unmarshall);
277
278 switch (call->unmarshall) {
279 case 0:
280 afs_extract_to_tmp(call);
281 call->unmarshall++;
282
283
284
285 case 1:
286 _debug("extract FID count");
287 ret = afs_extract_data(call, true);
288 if (ret < 0)
289 return ret;
290
291 call->count = ntohl(call->tmp);
292 _debug("FID count: %u", call->count);
293 if (call->count > AFSCBMAX)
294 return afs_protocol_error(call, -EBADMSG,
295 afs_eproto_cb_fid_count);
296
297 call->buffer = kmalloc(array3_size(call->count, 3, 4),
298 GFP_KERNEL);
299 if (!call->buffer)
300 return -ENOMEM;
301 afs_extract_to_buf(call, call->count * 3 * 4);
302 call->unmarshall++;
303
304
305 case 2:
306 _debug("extract FID array");
307 ret = afs_extract_data(call, true);
308 if (ret < 0)
309 return ret;
310
311 _debug("unmarshall FID array");
312 call->request = kcalloc(call->count,
313 sizeof(struct afs_callback_break),
314 GFP_KERNEL);
315 if (!call->request)
316 return -ENOMEM;
317
318 cb = call->request;
319 bp = call->buffer;
320 for (loop = call->count; loop > 0; loop--, cb++) {
321 cb->fid.vid = ntohl(*bp++);
322 cb->fid.vnode = ntohl(*bp++);
323 cb->fid.unique = ntohl(*bp++);
324 }
325
326 afs_extract_to_tmp(call);
327 call->unmarshall++;
328
329
330
331 case 3:
332 _debug("extract CB count");
333 ret = afs_extract_data(call, true);
334 if (ret < 0)
335 return ret;
336
337 call->count2 = ntohl(call->tmp);
338 _debug("CB count: %u", call->count2);
339 if (call->count2 != call->count && call->count2 != 0)
340 return afs_protocol_error(call, -EBADMSG,
341 afs_eproto_cb_count);
342 call->_iter = &call->iter;
343 iov_iter_discard(&call->iter, READ, call->count2 * 3 * 4);
344 call->unmarshall++;
345
346
347 case 4:
348 _debug("extract discard %zu/%u",
349 iov_iter_count(&call->iter), call->count2 * 3 * 4);
350
351 ret = afs_extract_data(call, false);
352 if (ret < 0)
353 return ret;
354
355 call->unmarshall++;
356 case 5:
357 break;
358 }
359
360 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
361 return afs_io_error(call, afs_io_error_cm_reply);
362
363
364
365 return afs_find_cm_server_by_peer(call);
366}
367
368
369
370
371static void SRXAFSCB_InitCallBackState(struct work_struct *work)
372{
373 struct afs_call *call = container_of(work, struct afs_call, work);
374
375 _enter("{%p}", call->server);
376
377 if (call->server)
378 afs_init_callback_state(call->server);
379 afs_send_empty_reply(call);
380 afs_put_call(call);
381 _leave("");
382}
383
384
385
386
387static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
388{
389 int ret;
390
391 _enter("");
392
393 afs_extract_discard(call, 0);
394 ret = afs_extract_data(call, false);
395 if (ret < 0)
396 return ret;
397
398
399
400 return afs_find_cm_server_by_peer(call);
401}
402
403
404
405
406static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
407{
408 struct afs_uuid *r;
409 unsigned loop;
410 __be32 *b;
411 int ret;
412
413 _enter("");
414
415 _enter("{%u}", call->unmarshall);
416
417 switch (call->unmarshall) {
418 case 0:
419 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
420 if (!call->buffer)
421 return -ENOMEM;
422 afs_extract_to_buf(call, 11 * sizeof(__be32));
423 call->unmarshall++;
424
425
426 case 1:
427 _debug("extract UUID");
428 ret = afs_extract_data(call, false);
429 switch (ret) {
430 case 0: break;
431 case -EAGAIN: return 0;
432 default: return ret;
433 }
434
435 _debug("unmarshall UUID");
436 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
437 if (!call->request)
438 return -ENOMEM;
439
440 b = call->buffer;
441 r = call->request;
442 r->time_low = b[0];
443 r->time_mid = htons(ntohl(b[1]));
444 r->time_hi_and_version = htons(ntohl(b[2]));
445 r->clock_seq_hi_and_reserved = ntohl(b[3]);
446 r->clock_seq_low = ntohl(b[4]);
447
448 for (loop = 0; loop < 6; loop++)
449 r->node[loop] = ntohl(b[loop + 5]);
450
451 call->unmarshall++;
452
453 case 2:
454 break;
455 }
456
457 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
458 return afs_io_error(call, afs_io_error_cm_reply);
459
460
461
462 return afs_find_cm_server_by_uuid(call, call->request);
463}
464
465
466
467
468static void SRXAFSCB_Probe(struct work_struct *work)
469{
470 struct afs_call *call = container_of(work, struct afs_call, work);
471
472 _enter("");
473 afs_send_empty_reply(call);
474 afs_put_call(call);
475 _leave("");
476}
477
478
479
480
481static int afs_deliver_cb_probe(struct afs_call *call)
482{
483 int ret;
484
485 _enter("");
486
487 afs_extract_discard(call, 0);
488 ret = afs_extract_data(call, false);
489 if (ret < 0)
490 return ret;
491
492 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
493 return afs_io_error(call, afs_io_error_cm_reply);
494 return afs_find_cm_server_by_peer(call);
495}
496
497
498
499
500static void SRXAFSCB_ProbeUuid(struct work_struct *work)
501{
502 struct afs_call *call = container_of(work, struct afs_call, work);
503 struct afs_uuid *r = call->request;
504
505 struct {
506 __be32 match;
507 } reply;
508
509 _enter("");
510
511 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
512 reply.match = htonl(0);
513 else
514 reply.match = htonl(1);
515
516 afs_send_simple_reply(call, &reply, sizeof(reply));
517 afs_put_call(call);
518 _leave("");
519}
520
521
522
523
524static int afs_deliver_cb_probe_uuid(struct afs_call *call)
525{
526 struct afs_uuid *r;
527 unsigned loop;
528 __be32 *b;
529 int ret;
530
531 _enter("{%u}", call->unmarshall);
532
533 switch (call->unmarshall) {
534 case 0:
535 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
536 if (!call->buffer)
537 return -ENOMEM;
538 afs_extract_to_buf(call, 11 * sizeof(__be32));
539 call->unmarshall++;
540
541
542 case 1:
543 _debug("extract UUID");
544 ret = afs_extract_data(call, false);
545 switch (ret) {
546 case 0: break;
547 case -EAGAIN: return 0;
548 default: return ret;
549 }
550
551 _debug("unmarshall UUID");
552 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
553 if (!call->request)
554 return -ENOMEM;
555
556 b = call->buffer;
557 r = call->request;
558 r->time_low = b[0];
559 r->time_mid = htons(ntohl(b[1]));
560 r->time_hi_and_version = htons(ntohl(b[2]));
561 r->clock_seq_hi_and_reserved = ntohl(b[3]);
562 r->clock_seq_low = ntohl(b[4]);
563
564 for (loop = 0; loop < 6; loop++)
565 r->node[loop] = ntohl(b[loop + 5]);
566
567 call->unmarshall++;
568
569 case 2:
570 break;
571 }
572
573 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
574 return afs_io_error(call, afs_io_error_cm_reply);
575 return afs_find_cm_server_by_uuid(call, call->request);
576}
577
578
579
580
581static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
582{
583 struct afs_interface *ifs;
584 struct afs_call *call = container_of(work, struct afs_call, work);
585 int loop, nifs;
586
587 struct {
588 struct {
589 __be32 nifs;
590 __be32 uuid[11];
591 __be32 ifaddr[32];
592 __be32 netmask[32];
593 __be32 mtu[32];
594 } ia;
595 struct {
596 __be32 capcount;
597 __be32 caps[1];
598 } cap;
599 } reply;
600
601 _enter("");
602
603 nifs = 0;
604 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
605 if (ifs) {
606 nifs = afs_get_ipv4_interfaces(call->net, ifs, 32, false);
607 if (nifs < 0) {
608 kfree(ifs);
609 ifs = NULL;
610 nifs = 0;
611 }
612 }
613
614 memset(&reply, 0, sizeof(reply));
615 reply.ia.nifs = htonl(nifs);
616
617 reply.ia.uuid[0] = call->net->uuid.time_low;
618 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
619 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
620 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
621 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
622 for (loop = 0; loop < 6; loop++)
623 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
624
625 if (ifs) {
626 for (loop = 0; loop < nifs; loop++) {
627 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
628 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
629 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
630 }
631 kfree(ifs);
632 }
633
634 reply.cap.capcount = htonl(1);
635 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
636 afs_send_simple_reply(call, &reply, sizeof(reply));
637 afs_put_call(call);
638 _leave("");
639}
640
641
642
643
644static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
645{
646 int ret;
647
648 _enter("");
649
650 afs_extract_discard(call, 0);
651 ret = afs_extract_data(call, false);
652 if (ret < 0)
653 return ret;
654
655 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
656 return afs_io_error(call, afs_io_error_cm_reply);
657 return afs_find_cm_server_by_peer(call);
658}
659
660
661
662
663static int afs_deliver_yfs_cb_callback(struct afs_call *call)
664{
665 struct afs_callback_break *cb;
666 struct yfs_xdr_YFSFid *bp;
667 size_t size;
668 int ret, loop;
669
670 _enter("{%u}", call->unmarshall);
671
672 switch (call->unmarshall) {
673 case 0:
674 afs_extract_to_tmp(call);
675 call->unmarshall++;
676
677
678
679 case 1:
680 _debug("extract FID count");
681 ret = afs_extract_data(call, true);
682 if (ret < 0)
683 return ret;
684
685 call->count = ntohl(call->tmp);
686 _debug("FID count: %u", call->count);
687 if (call->count > YFSCBMAX)
688 return afs_protocol_error(call, -EBADMSG,
689 afs_eproto_cb_fid_count);
690
691 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
692 call->buffer = kmalloc(size, GFP_KERNEL);
693 if (!call->buffer)
694 return -ENOMEM;
695 afs_extract_to_buf(call, size);
696 call->unmarshall++;
697
698
699 case 2:
700 _debug("extract FID array");
701 ret = afs_extract_data(call, false);
702 if (ret < 0)
703 return ret;
704
705 _debug("unmarshall FID array");
706 call->request = kcalloc(call->count,
707 sizeof(struct afs_callback_break),
708 GFP_KERNEL);
709 if (!call->request)
710 return -ENOMEM;
711
712 cb = call->request;
713 bp = call->buffer;
714 for (loop = call->count; loop > 0; loop--, cb++) {
715 cb->fid.vid = xdr_to_u64(bp->volume);
716 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
717 cb->fid.vnode_hi = ntohl(bp->vnode.hi);
718 cb->fid.unique = ntohl(bp->vnode.unique);
719 bp++;
720 }
721
722 afs_extract_to_tmp(call);
723 call->unmarshall++;
724
725 case 3:
726 break;
727 }
728
729 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
730 return afs_io_error(call, afs_io_error_cm_reply);
731
732
733
734
735 return afs_find_cm_server_by_peer(call);
736}
737