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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* AFS Cache Manager Service
3 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
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#define RXRPC_TRACE_ONLY_DEFINE_ENUMS
17#include <trace/events/rxrpc.h>
18
19static int afs_deliver_cb_init_call_back_state(struct afs_call *);
20static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
21static int afs_deliver_cb_probe(struct afs_call *);
22static int afs_deliver_cb_callback(struct afs_call *);
23static int afs_deliver_cb_probe_uuid(struct afs_call *);
24static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
25static void afs_cm_destructor(struct afs_call *);
26static void SRXAFSCB_CallBack(struct work_struct *);
27static void SRXAFSCB_InitCallBackState(struct work_struct *);
28static void SRXAFSCB_Probe(struct work_struct *);
29static void SRXAFSCB_ProbeUuid(struct work_struct *);
30static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
31
32static int afs_deliver_yfs_cb_callback(struct afs_call *);
33
34/*
35 * CB.CallBack operation type
36 */
37static const struct afs_call_type afs_SRXCBCallBack = {
38 .name = "CB.CallBack",
39 .deliver = afs_deliver_cb_callback,
40 .destructor = afs_cm_destructor,
41 .work = SRXAFSCB_CallBack,
42};
43
44/*
45 * CB.InitCallBackState operation type
46 */
47static const struct afs_call_type afs_SRXCBInitCallBackState = {
48 .name = "CB.InitCallBackState",
49 .deliver = afs_deliver_cb_init_call_back_state,
50 .destructor = afs_cm_destructor,
51 .work = SRXAFSCB_InitCallBackState,
52};
53
54/*
55 * CB.InitCallBackState3 operation type
56 */
57static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
58 .name = "CB.InitCallBackState3",
59 .deliver = afs_deliver_cb_init_call_back_state3,
60 .destructor = afs_cm_destructor,
61 .work = SRXAFSCB_InitCallBackState,
62};
63
64/*
65 * CB.Probe operation type
66 */
67static const struct afs_call_type afs_SRXCBProbe = {
68 .name = "CB.Probe",
69 .deliver = afs_deliver_cb_probe,
70 .destructor = afs_cm_destructor,
71 .work = SRXAFSCB_Probe,
72};
73
74/*
75 * CB.ProbeUuid operation type
76 */
77static const struct afs_call_type afs_SRXCBProbeUuid = {
78 .name = "CB.ProbeUuid",
79 .deliver = afs_deliver_cb_probe_uuid,
80 .destructor = afs_cm_destructor,
81 .work = SRXAFSCB_ProbeUuid,
82};
83
84/*
85 * CB.TellMeAboutYourself operation type
86 */
87static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
88 .name = "CB.TellMeAboutYourself",
89 .deliver = afs_deliver_cb_tell_me_about_yourself,
90 .destructor = afs_cm_destructor,
91 .work = SRXAFSCB_TellMeAboutYourself,
92};
93
94/*
95 * YFS CB.CallBack operation type
96 */
97static const struct afs_call_type afs_SRXYFSCB_CallBack = {
98 .name = "YFSCB.CallBack",
99 .deliver = afs_deliver_yfs_cb_callback,
100 .destructor = afs_cm_destructor,
101 .work = SRXAFSCB_CallBack,
102};
103
104/*
105 * route an incoming cache manager call
106 * - return T if supported, F if not
107 */
108bool afs_cm_incoming_call(struct afs_call *call)
109{
110 _enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
111
112 switch (call->operation_ID) {
113 case CBCallBack:
114 call->type = &afs_SRXCBCallBack;
115 return true;
116 case CBInitCallBackState:
117 call->type = &afs_SRXCBInitCallBackState;
118 return true;
119 case CBInitCallBackState3:
120 call->type = &afs_SRXCBInitCallBackState3;
121 return true;
122 case CBProbe:
123 call->type = &afs_SRXCBProbe;
124 return true;
125 case CBProbeUuid:
126 call->type = &afs_SRXCBProbeUuid;
127 return true;
128 case CBTellMeAboutYourself:
129 call->type = &afs_SRXCBTellMeAboutYourself;
130 return true;
131 case YFSCBCallBack:
132 if (call->service_id != YFS_CM_SERVICE)
133 return false;
134 call->type = &afs_SRXYFSCB_CallBack;
135 return true;
136 default:
137 return false;
138 }
139}
140
141/*
142 * Find the server record by peer address and record a probe to the cache
143 * manager from a server.
144 */
145static int afs_find_cm_server_by_peer(struct afs_call *call)
146{
147 struct sockaddr_rxrpc srx;
148 struct afs_server *server;
149 struct rxrpc_peer *peer;
150
151 peer = rxrpc_kernel_get_call_peer(call->net->socket, call->rxcall);
152
153 server = afs_find_server(call->net, peer);
154 if (!server) {
155 trace_afs_cm_no_server(call, &srx);
156 return 0;
157 }
158
159 call->server = server;
160 return 0;
161}
162
163/*
164 * Find the server record by server UUID and record a probe to the cache
165 * manager from a server.
166 */
167static int afs_find_cm_server_by_uuid(struct afs_call *call,
168 struct afs_uuid *uuid)
169{
170 struct afs_server *server;
171
172 rcu_read_lock();
173 server = afs_find_server_by_uuid(call->net, call->request);
174 rcu_read_unlock();
175 if (!server) {
176 trace_afs_cm_no_server_u(call, call->request);
177 return 0;
178 }
179
180 call->server = server;
181 return 0;
182}
183
184/*
185 * Clean up a cache manager call.
186 */
187static void afs_cm_destructor(struct afs_call *call)
188{
189 kfree(call->buffer);
190 call->buffer = NULL;
191}
192
193/*
194 * Abort a service call from within an action function.
195 */
196static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
197 enum rxrpc_abort_reason why)
198{
199 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
200 abort_code, error, why);
201 afs_set_call_complete(call, error, 0);
202}
203
204/*
205 * The server supplied a list of callbacks that it wanted to break.
206 */
207static void SRXAFSCB_CallBack(struct work_struct *work)
208{
209 struct afs_call *call = container_of(work, struct afs_call, work);
210
211 _enter("");
212
213 /* We need to break the callbacks before sending the reply as the
214 * server holds up change visibility till it receives our reply so as
215 * to maintain cache coherency.
216 */
217 if (call->server) {
218 trace_afs_server(call->server->debug_id,
219 refcount_read(&call->server->ref),
220 atomic_read(&call->server->active),
221 afs_server_trace_callback);
222 afs_break_callbacks(call->server, call->count, call->request);
223 }
224
225 afs_send_empty_reply(call);
226 afs_put_call(call);
227 _leave("");
228}
229
230/*
231 * deliver request data to a CB.CallBack call
232 */
233static int afs_deliver_cb_callback(struct afs_call *call)
234{
235 struct afs_callback_break *cb;
236 __be32 *bp;
237 int ret, loop;
238
239 _enter("{%u}", call->unmarshall);
240
241 switch (call->unmarshall) {
242 case 0:
243 afs_extract_to_tmp(call);
244 call->unmarshall++;
245
246 /* extract the FID array and its count in two steps */
247 fallthrough;
248 case 1:
249 _debug("extract FID count");
250 ret = afs_extract_data(call, true);
251 if (ret < 0)
252 return ret;
253
254 call->count = ntohl(call->tmp);
255 _debug("FID count: %u", call->count);
256 if (call->count > AFSCBMAX)
257 return afs_protocol_error(call, afs_eproto_cb_fid_count);
258
259 call->buffer = kmalloc(array3_size(call->count, 3, 4),
260 GFP_KERNEL);
261 if (!call->buffer)
262 return -ENOMEM;
263 afs_extract_to_buf(call, call->count * 3 * 4);
264 call->unmarshall++;
265
266 fallthrough;
267 case 2:
268 _debug("extract FID array");
269 ret = afs_extract_data(call, true);
270 if (ret < 0)
271 return ret;
272
273 _debug("unmarshall FID array");
274 call->request = kcalloc(call->count,
275 sizeof(struct afs_callback_break),
276 GFP_KERNEL);
277 if (!call->request)
278 return -ENOMEM;
279
280 cb = call->request;
281 bp = call->buffer;
282 for (loop = call->count; loop > 0; loop--, cb++) {
283 cb->fid.vid = ntohl(*bp++);
284 cb->fid.vnode = ntohl(*bp++);
285 cb->fid.unique = ntohl(*bp++);
286 }
287
288 afs_extract_to_tmp(call);
289 call->unmarshall++;
290
291 /* extract the callback array and its count in two steps */
292 fallthrough;
293 case 3:
294 _debug("extract CB count");
295 ret = afs_extract_data(call, true);
296 if (ret < 0)
297 return ret;
298
299 call->count2 = ntohl(call->tmp);
300 _debug("CB count: %u", call->count2);
301 if (call->count2 != call->count && call->count2 != 0)
302 return afs_protocol_error(call, afs_eproto_cb_count);
303 call->iter = &call->def_iter;
304 iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
305 call->unmarshall++;
306
307 fallthrough;
308 case 4:
309 _debug("extract discard %zu/%u",
310 iov_iter_count(call->iter), call->count2 * 3 * 4);
311
312 ret = afs_extract_data(call, false);
313 if (ret < 0)
314 return ret;
315
316 call->unmarshall++;
317 fallthrough;
318
319 case 5:
320 break;
321 }
322
323 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
324 return afs_io_error(call, afs_io_error_cm_reply);
325
326 /* we'll need the file server record as that tells us which set of
327 * vnodes to operate upon */
328 return afs_find_cm_server_by_peer(call);
329}
330
331/*
332 * allow the fileserver to request callback state (re-)initialisation
333 */
334static void SRXAFSCB_InitCallBackState(struct work_struct *work)
335{
336 struct afs_call *call = container_of(work, struct afs_call, work);
337
338 _enter("{%p}", call->server);
339
340 if (call->server)
341 afs_init_callback_state(call->server);
342 afs_send_empty_reply(call);
343 afs_put_call(call);
344 _leave("");
345}
346
347/*
348 * deliver request data to a CB.InitCallBackState call
349 */
350static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
351{
352 int ret;
353
354 _enter("");
355
356 afs_extract_discard(call, 0);
357 ret = afs_extract_data(call, false);
358 if (ret < 0)
359 return ret;
360
361 /* we'll need the file server record as that tells us which set of
362 * vnodes to operate upon */
363 return afs_find_cm_server_by_peer(call);
364}
365
366/*
367 * deliver request data to a CB.InitCallBackState3 call
368 */
369static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
370{
371 struct afs_uuid *r;
372 unsigned loop;
373 __be32 *b;
374 int ret;
375
376 _enter("");
377
378 _enter("{%u}", call->unmarshall);
379
380 switch (call->unmarshall) {
381 case 0:
382 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
383 if (!call->buffer)
384 return -ENOMEM;
385 afs_extract_to_buf(call, 11 * sizeof(__be32));
386 call->unmarshall++;
387
388 fallthrough;
389 case 1:
390 _debug("extract UUID");
391 ret = afs_extract_data(call, false);
392 switch (ret) {
393 case 0: break;
394 case -EAGAIN: return 0;
395 default: return ret;
396 }
397
398 _debug("unmarshall UUID");
399 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
400 if (!call->request)
401 return -ENOMEM;
402
403 b = call->buffer;
404 r = call->request;
405 r->time_low = b[0];
406 r->time_mid = htons(ntohl(b[1]));
407 r->time_hi_and_version = htons(ntohl(b[2]));
408 r->clock_seq_hi_and_reserved = ntohl(b[3]);
409 r->clock_seq_low = ntohl(b[4]);
410
411 for (loop = 0; loop < 6; loop++)
412 r->node[loop] = ntohl(b[loop + 5]);
413
414 call->unmarshall++;
415 fallthrough;
416
417 case 2:
418 break;
419 }
420
421 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
422 return afs_io_error(call, afs_io_error_cm_reply);
423
424 /* we'll need the file server record as that tells us which set of
425 * vnodes to operate upon */
426 return afs_find_cm_server_by_uuid(call, call->request);
427}
428
429/*
430 * allow the fileserver to see if the cache manager is still alive
431 */
432static void SRXAFSCB_Probe(struct work_struct *work)
433{
434 struct afs_call *call = container_of(work, struct afs_call, work);
435
436 _enter("");
437 afs_send_empty_reply(call);
438 afs_put_call(call);
439 _leave("");
440}
441
442/*
443 * deliver request data to a CB.Probe call
444 */
445static int afs_deliver_cb_probe(struct afs_call *call)
446{
447 int ret;
448
449 _enter("");
450
451 afs_extract_discard(call, 0);
452 ret = afs_extract_data(call, false);
453 if (ret < 0)
454 return ret;
455
456 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
457 return afs_io_error(call, afs_io_error_cm_reply);
458 return afs_find_cm_server_by_peer(call);
459}
460
461/*
462 * Allow the fileserver to quickly find out if the cache manager has been
463 * rebooted.
464 */
465static void SRXAFSCB_ProbeUuid(struct work_struct *work)
466{
467 struct afs_call *call = container_of(work, struct afs_call, work);
468 struct afs_uuid *r = call->request;
469
470 _enter("");
471
472 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
473 afs_send_empty_reply(call);
474 else
475 afs_abort_service_call(call, 1, 1, afs_abort_probeuuid_negative);
476
477 afs_put_call(call);
478 _leave("");
479}
480
481/*
482 * deliver request data to a CB.ProbeUuid call
483 */
484static int afs_deliver_cb_probe_uuid(struct afs_call *call)
485{
486 struct afs_uuid *r;
487 unsigned loop;
488 __be32 *b;
489 int ret;
490
491 _enter("{%u}", call->unmarshall);
492
493 switch (call->unmarshall) {
494 case 0:
495 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
496 if (!call->buffer)
497 return -ENOMEM;
498 afs_extract_to_buf(call, 11 * sizeof(__be32));
499 call->unmarshall++;
500
501 fallthrough;
502 case 1:
503 _debug("extract UUID");
504 ret = afs_extract_data(call, false);
505 switch (ret) {
506 case 0: break;
507 case -EAGAIN: return 0;
508 default: return ret;
509 }
510
511 _debug("unmarshall UUID");
512 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
513 if (!call->request)
514 return -ENOMEM;
515
516 b = call->buffer;
517 r = call->request;
518 r->time_low = b[0];
519 r->time_mid = htons(ntohl(b[1]));
520 r->time_hi_and_version = htons(ntohl(b[2]));
521 r->clock_seq_hi_and_reserved = ntohl(b[3]);
522 r->clock_seq_low = ntohl(b[4]);
523
524 for (loop = 0; loop < 6; loop++)
525 r->node[loop] = ntohl(b[loop + 5]);
526
527 call->unmarshall++;
528 fallthrough;
529
530 case 2:
531 break;
532 }
533
534 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
535 return afs_io_error(call, afs_io_error_cm_reply);
536 return afs_find_cm_server_by_peer(call);
537}
538
539/*
540 * allow the fileserver to ask about the cache manager's capabilities
541 */
542static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
543{
544 struct afs_call *call = container_of(work, struct afs_call, work);
545 int loop;
546
547 struct {
548 struct /* InterfaceAddr */ {
549 __be32 nifs;
550 __be32 uuid[11];
551 __be32 ifaddr[32];
552 __be32 netmask[32];
553 __be32 mtu[32];
554 } ia;
555 struct /* Capabilities */ {
556 __be32 capcount;
557 __be32 caps[1];
558 } cap;
559 } reply;
560
561 _enter("");
562
563 memset(&reply, 0, sizeof(reply));
564
565 reply.ia.uuid[0] = call->net->uuid.time_low;
566 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
567 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
568 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
569 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
570 for (loop = 0; loop < 6; loop++)
571 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
572
573 reply.cap.capcount = htonl(1);
574 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
575 afs_send_simple_reply(call, &reply, sizeof(reply));
576 afs_put_call(call);
577 _leave("");
578}
579
580/*
581 * deliver request data to a CB.TellMeAboutYourself call
582 */
583static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
584{
585 int ret;
586
587 _enter("");
588
589 afs_extract_discard(call, 0);
590 ret = afs_extract_data(call, false);
591 if (ret < 0)
592 return ret;
593
594 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
595 return afs_io_error(call, afs_io_error_cm_reply);
596 return afs_find_cm_server_by_peer(call);
597}
598
599/*
600 * deliver request data to a YFS CB.CallBack call
601 */
602static int afs_deliver_yfs_cb_callback(struct afs_call *call)
603{
604 struct afs_callback_break *cb;
605 struct yfs_xdr_YFSFid *bp;
606 size_t size;
607 int ret, loop;
608
609 _enter("{%u}", call->unmarshall);
610
611 switch (call->unmarshall) {
612 case 0:
613 afs_extract_to_tmp(call);
614 call->unmarshall++;
615
616 /* extract the FID array and its count in two steps */
617 fallthrough;
618 case 1:
619 _debug("extract FID count");
620 ret = afs_extract_data(call, true);
621 if (ret < 0)
622 return ret;
623
624 call->count = ntohl(call->tmp);
625 _debug("FID count: %u", call->count);
626 if (call->count > YFSCBMAX)
627 return afs_protocol_error(call, afs_eproto_cb_fid_count);
628
629 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
630 call->buffer = kmalloc(size, GFP_KERNEL);
631 if (!call->buffer)
632 return -ENOMEM;
633 afs_extract_to_buf(call, size);
634 call->unmarshall++;
635
636 fallthrough;
637 case 2:
638 _debug("extract FID array");
639 ret = afs_extract_data(call, false);
640 if (ret < 0)
641 return ret;
642
643 _debug("unmarshall FID array");
644 call->request = kcalloc(call->count,
645 sizeof(struct afs_callback_break),
646 GFP_KERNEL);
647 if (!call->request)
648 return -ENOMEM;
649
650 cb = call->request;
651 bp = call->buffer;
652 for (loop = call->count; loop > 0; loop--, cb++) {
653 cb->fid.vid = xdr_to_u64(bp->volume);
654 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
655 cb->fid.vnode_hi = ntohl(bp->vnode.hi);
656 cb->fid.unique = ntohl(bp->vnode.unique);
657 bp++;
658 }
659
660 afs_extract_to_tmp(call);
661 call->unmarshall++;
662 fallthrough;
663
664 case 3:
665 break;
666 }
667
668 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
669 return afs_io_error(call, afs_io_error_cm_reply);
670
671 /* We'll need the file server record as that tells us which set of
672 * vnodes to operate upon.
673 */
674 return afs_find_cm_server_by_peer(call);
675}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* AFS Cache Manager Service
3 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
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 * CB.CallBack operation type
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 * CB.InitCallBackState operation type
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 * CB.InitCallBackState3 operation type
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 * CB.Probe operation type
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 * CB.ProbeUuid operation type
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 * CB.TellMeAboutYourself operation type
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 * YFS CB.CallBack operation type
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 * route an incoming cache manager call
115 * - return T if supported, F if not
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 * Record a probe to the cache manager from a server.
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 * Find the server record by peer address and record a probe to the cache
197 * manager from a server.
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 * Find the server record by server UUID and record a probe to the cache
218 * manager from a server.
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 * Clean up a cache manager call.
239 */
240static void afs_cm_destructor(struct afs_call *call)
241{
242 kfree(call->buffer);
243 call->buffer = NULL;
244}
245
246/*
247 * The server supplied a list of callbacks that it wanted to break.
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 /* We need to break the callbacks before sending the reply as the
256 * server holds up change visibility till it receives our reply so as
257 * to maintain cache coherency.
258 */
259 if (call->server) {
260 trace_afs_server(call->server, atomic_read(&call->server->usage),
261 afs_server_trace_callback);
262 afs_break_callbacks(call->server, call->count, call->request);
263 }
264
265 afs_send_empty_reply(call);
266 afs_put_call(call);
267 _leave("");
268}
269
270/*
271 * deliver request data to a CB.CallBack call
272 */
273static int afs_deliver_cb_callback(struct afs_call *call)
274{
275 struct afs_callback_break *cb;
276 __be32 *bp;
277 int ret, loop;
278
279 _enter("{%u}", call->unmarshall);
280
281 switch (call->unmarshall) {
282 case 0:
283 afs_extract_to_tmp(call);
284 call->unmarshall++;
285
286 /* extract the FID array and its count in two steps */
287 /* fall through */
288 case 1:
289 _debug("extract FID count");
290 ret = afs_extract_data(call, true);
291 if (ret < 0)
292 return ret;
293
294 call->count = ntohl(call->tmp);
295 _debug("FID count: %u", call->count);
296 if (call->count > AFSCBMAX)
297 return afs_protocol_error(call, -EBADMSG,
298 afs_eproto_cb_fid_count);
299
300 call->buffer = kmalloc(array3_size(call->count, 3, 4),
301 GFP_KERNEL);
302 if (!call->buffer)
303 return -ENOMEM;
304 afs_extract_to_buf(call, call->count * 3 * 4);
305 call->unmarshall++;
306
307 /* Fall through */
308 case 2:
309 _debug("extract FID array");
310 ret = afs_extract_data(call, true);
311 if (ret < 0)
312 return ret;
313
314 _debug("unmarshall FID array");
315 call->request = kcalloc(call->count,
316 sizeof(struct afs_callback_break),
317 GFP_KERNEL);
318 if (!call->request)
319 return -ENOMEM;
320
321 cb = call->request;
322 bp = call->buffer;
323 for (loop = call->count; loop > 0; loop--, cb++) {
324 cb->fid.vid = ntohl(*bp++);
325 cb->fid.vnode = ntohl(*bp++);
326 cb->fid.unique = ntohl(*bp++);
327 }
328
329 afs_extract_to_tmp(call);
330 call->unmarshall++;
331
332 /* extract the callback array and its count in two steps */
333 /* fall through */
334 case 3:
335 _debug("extract CB count");
336 ret = afs_extract_data(call, true);
337 if (ret < 0)
338 return ret;
339
340 call->count2 = ntohl(call->tmp);
341 _debug("CB count: %u", call->count2);
342 if (call->count2 != call->count && call->count2 != 0)
343 return afs_protocol_error(call, -EBADMSG,
344 afs_eproto_cb_count);
345 call->_iter = &call->iter;
346 iov_iter_discard(&call->iter, READ, call->count2 * 3 * 4);
347 call->unmarshall++;
348
349 /* Fall through */
350 case 4:
351 _debug("extract discard %zu/%u",
352 iov_iter_count(&call->iter), call->count2 * 3 * 4);
353
354 ret = afs_extract_data(call, false);
355 if (ret < 0)
356 return ret;
357
358 call->unmarshall++;
359 case 5:
360 break;
361 }
362
363 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
364 return afs_io_error(call, afs_io_error_cm_reply);
365
366 /* we'll need the file server record as that tells us which set of
367 * vnodes to operate upon */
368 return afs_find_cm_server_by_peer(call);
369}
370
371/*
372 * allow the fileserver to request callback state (re-)initialisation
373 */
374static void SRXAFSCB_InitCallBackState(struct work_struct *work)
375{
376 struct afs_call *call = container_of(work, struct afs_call, work);
377
378 _enter("{%p}", call->server);
379
380 if (call->server)
381 afs_init_callback_state(call->server);
382 afs_send_empty_reply(call);
383 afs_put_call(call);
384 _leave("");
385}
386
387/*
388 * deliver request data to a CB.InitCallBackState call
389 */
390static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
391{
392 int ret;
393
394 _enter("");
395
396 afs_extract_discard(call, 0);
397 ret = afs_extract_data(call, false);
398 if (ret < 0)
399 return ret;
400
401 /* we'll need the file server record as that tells us which set of
402 * vnodes to operate upon */
403 return afs_find_cm_server_by_peer(call);
404}
405
406/*
407 * deliver request data to a CB.InitCallBackState3 call
408 */
409static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
410{
411 struct afs_uuid *r;
412 unsigned loop;
413 __be32 *b;
414 int ret;
415
416 _enter("");
417
418 _enter("{%u}", call->unmarshall);
419
420 switch (call->unmarshall) {
421 case 0:
422 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
423 if (!call->buffer)
424 return -ENOMEM;
425 afs_extract_to_buf(call, 11 * sizeof(__be32));
426 call->unmarshall++;
427
428 /* Fall through */
429 case 1:
430 _debug("extract UUID");
431 ret = afs_extract_data(call, false);
432 switch (ret) {
433 case 0: break;
434 case -EAGAIN: return 0;
435 default: return ret;
436 }
437
438 _debug("unmarshall UUID");
439 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
440 if (!call->request)
441 return -ENOMEM;
442
443 b = call->buffer;
444 r = call->request;
445 r->time_low = b[0];
446 r->time_mid = htons(ntohl(b[1]));
447 r->time_hi_and_version = htons(ntohl(b[2]));
448 r->clock_seq_hi_and_reserved = ntohl(b[3]);
449 r->clock_seq_low = ntohl(b[4]);
450
451 for (loop = 0; loop < 6; loop++)
452 r->node[loop] = ntohl(b[loop + 5]);
453
454 call->unmarshall++;
455
456 case 2:
457 break;
458 }
459
460 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
461 return afs_io_error(call, afs_io_error_cm_reply);
462
463 /* we'll need the file server record as that tells us which set of
464 * vnodes to operate upon */
465 return afs_find_cm_server_by_uuid(call, call->request);
466}
467
468/*
469 * allow the fileserver to see if the cache manager is still alive
470 */
471static void SRXAFSCB_Probe(struct work_struct *work)
472{
473 struct afs_call *call = container_of(work, struct afs_call, work);
474
475 _enter("");
476 afs_send_empty_reply(call);
477 afs_put_call(call);
478 _leave("");
479}
480
481/*
482 * deliver request data to a CB.Probe call
483 */
484static int afs_deliver_cb_probe(struct afs_call *call)
485{
486 int ret;
487
488 _enter("");
489
490 afs_extract_discard(call, 0);
491 ret = afs_extract_data(call, false);
492 if (ret < 0)
493 return ret;
494
495 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
496 return afs_io_error(call, afs_io_error_cm_reply);
497 return afs_find_cm_server_by_peer(call);
498}
499
500/*
501 * allow the fileserver to quickly find out if the fileserver has been rebooted
502 */
503static void SRXAFSCB_ProbeUuid(struct work_struct *work)
504{
505 struct afs_call *call = container_of(work, struct afs_call, work);
506 struct afs_uuid *r = call->request;
507
508 _enter("");
509
510 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
511 afs_send_empty_reply(call);
512 else
513 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
514 1, 1, "K-1");
515
516 afs_put_call(call);
517 _leave("");
518}
519
520/*
521 * deliver request data to a CB.ProbeUuid call
522 */
523static int afs_deliver_cb_probe_uuid(struct afs_call *call)
524{
525 struct afs_uuid *r;
526 unsigned loop;
527 __be32 *b;
528 int ret;
529
530 _enter("{%u}", call->unmarshall);
531
532 switch (call->unmarshall) {
533 case 0:
534 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
535 if (!call->buffer)
536 return -ENOMEM;
537 afs_extract_to_buf(call, 11 * sizeof(__be32));
538 call->unmarshall++;
539
540 /* Fall through */
541 case 1:
542 _debug("extract UUID");
543 ret = afs_extract_data(call, false);
544 switch (ret) {
545 case 0: break;
546 case -EAGAIN: return 0;
547 default: return ret;
548 }
549
550 _debug("unmarshall UUID");
551 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
552 if (!call->request)
553 return -ENOMEM;
554
555 b = call->buffer;
556 r = call->request;
557 r->time_low = b[0];
558 r->time_mid = htons(ntohl(b[1]));
559 r->time_hi_and_version = htons(ntohl(b[2]));
560 r->clock_seq_hi_and_reserved = ntohl(b[3]);
561 r->clock_seq_low = ntohl(b[4]);
562
563 for (loop = 0; loop < 6; loop++)
564 r->node[loop] = ntohl(b[loop + 5]);
565
566 call->unmarshall++;
567
568 case 2:
569 break;
570 }
571
572 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
573 return afs_io_error(call, afs_io_error_cm_reply);
574 return afs_find_cm_server_by_uuid(call, call->request);
575}
576
577/*
578 * allow the fileserver to ask about the cache manager's capabilities
579 */
580static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
581{
582 struct afs_call *call = container_of(work, struct afs_call, work);
583 int loop;
584
585 struct {
586 struct /* InterfaceAddr */ {
587 __be32 nifs;
588 __be32 uuid[11];
589 __be32 ifaddr[32];
590 __be32 netmask[32];
591 __be32 mtu[32];
592 } ia;
593 struct /* Capabilities */ {
594 __be32 capcount;
595 __be32 caps[1];
596 } cap;
597 } reply;
598
599 _enter("");
600
601 memset(&reply, 0, sizeof(reply));
602
603 reply.ia.uuid[0] = call->net->uuid.time_low;
604 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
605 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
606 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
607 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
608 for (loop = 0; loop < 6; loop++)
609 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
610
611 reply.cap.capcount = htonl(1);
612 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
613 afs_send_simple_reply(call, &reply, sizeof(reply));
614 afs_put_call(call);
615 _leave("");
616}
617
618/*
619 * deliver request data to a CB.TellMeAboutYourself call
620 */
621static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
622{
623 int ret;
624
625 _enter("");
626
627 afs_extract_discard(call, 0);
628 ret = afs_extract_data(call, false);
629 if (ret < 0)
630 return ret;
631
632 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
633 return afs_io_error(call, afs_io_error_cm_reply);
634 return afs_find_cm_server_by_peer(call);
635}
636
637/*
638 * deliver request data to a YFS CB.CallBack call
639 */
640static int afs_deliver_yfs_cb_callback(struct afs_call *call)
641{
642 struct afs_callback_break *cb;
643 struct yfs_xdr_YFSFid *bp;
644 size_t size;
645 int ret, loop;
646
647 _enter("{%u}", call->unmarshall);
648
649 switch (call->unmarshall) {
650 case 0:
651 afs_extract_to_tmp(call);
652 call->unmarshall++;
653
654 /* extract the FID array and its count in two steps */
655 /* Fall through */
656 case 1:
657 _debug("extract FID count");
658 ret = afs_extract_data(call, true);
659 if (ret < 0)
660 return ret;
661
662 call->count = ntohl(call->tmp);
663 _debug("FID count: %u", call->count);
664 if (call->count > YFSCBMAX)
665 return afs_protocol_error(call, -EBADMSG,
666 afs_eproto_cb_fid_count);
667
668 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
669 call->buffer = kmalloc(size, GFP_KERNEL);
670 if (!call->buffer)
671 return -ENOMEM;
672 afs_extract_to_buf(call, size);
673 call->unmarshall++;
674
675 /* Fall through */
676 case 2:
677 _debug("extract FID array");
678 ret = afs_extract_data(call, false);
679 if (ret < 0)
680 return ret;
681
682 _debug("unmarshall FID array");
683 call->request = kcalloc(call->count,
684 sizeof(struct afs_callback_break),
685 GFP_KERNEL);
686 if (!call->request)
687 return -ENOMEM;
688
689 cb = call->request;
690 bp = call->buffer;
691 for (loop = call->count; loop > 0; loop--, cb++) {
692 cb->fid.vid = xdr_to_u64(bp->volume);
693 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
694 cb->fid.vnode_hi = ntohl(bp->vnode.hi);
695 cb->fid.unique = ntohl(bp->vnode.unique);
696 bp++;
697 }
698
699 afs_extract_to_tmp(call);
700 call->unmarshall++;
701
702 case 3:
703 break;
704 }
705
706 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
707 return afs_io_error(call, afs_io_error_cm_reply);
708
709 /* We'll need the file server record as that tells us which set of
710 * vnodes to operate upon.
711 */
712 return afs_find_cm_server_by_peer(call);
713}