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
17 static int afs_deliver_cb_init_call_back_state(struct afs_call *);
18 static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
19 static int afs_deliver_cb_probe(struct afs_call *);
20 static int afs_deliver_cb_callback(struct afs_call *);
21 static int afs_deliver_cb_probe_uuid(struct afs_call *);
22 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
23 static void afs_cm_destructor(struct afs_call *);
24 static void SRXAFSCB_CallBack(struct work_struct *);
25 static void SRXAFSCB_InitCallBackState(struct work_struct *);
26 static void SRXAFSCB_Probe(struct work_struct *);
27 static void SRXAFSCB_ProbeUuid(struct work_struct *);
28 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
29
30 static 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 */
39 static CM_NAME(CallBack);
40 static 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 */
50 static CM_NAME(InitCallBackState);
51 static 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 */
61 static CM_NAME(InitCallBackState3);
62 static 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 */
72 static CM_NAME(Probe);
73 static 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 */
83 static CM_NAME(ProbeUuid);
84 static 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 */
94 static CM_NAME(TellMeAboutYourself);
95 static 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 */
105 static CM_NAME(YFS_CallBack);
106 static 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 */
afs_cm_incoming_call(struct afs_call * call)117 bool 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 */
afs_record_cm_probe(struct afs_call * call,struct afs_server * server)155 static 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
189 out:
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 */
afs_find_cm_server_by_peer(struct afs_call * call)199 static 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 */
afs_find_cm_server_by_uuid(struct afs_call * call,struct afs_uuid * uuid)220 static 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 */
afs_cm_destructor(struct afs_call * call)240 static 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 */
SRXAFSCB_CallBack(struct work_struct * work)249 static 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 */
afs_deliver_cb_callback(struct afs_call * call)273 static 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 */
SRXAFSCB_InitCallBackState(struct work_struct * work)374 static 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 */
afs_deliver_cb_init_call_back_state(struct afs_call * call)390 static 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 */
afs_deliver_cb_init_call_back_state3(struct afs_call * call)409 static 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 */
SRXAFSCB_Probe(struct work_struct * work)471 static 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 */
afs_deliver_cb_probe(struct afs_call * call)484 static 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 */
SRXAFSCB_ProbeUuid(struct work_struct * work)503 static 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 */
afs_deliver_cb_probe_uuid(struct afs_call * call)523 static 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 */
SRXAFSCB_TellMeAboutYourself(struct work_struct * work)580 static 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 */
afs_deliver_cb_tell_me_about_yourself(struct afs_call * call)621 static 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 */
afs_deliver_yfs_cb_callback(struct afs_call * call)640 static 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 }
714
