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
19 static int afs_deliver_cb_init_call_back_state(struct afs_call *);
20 static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
21 static int afs_deliver_cb_probe(struct afs_call *);
22 static int afs_deliver_cb_callback(struct afs_call *);
23 static int afs_deliver_cb_probe_uuid(struct afs_call *);
24 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
25 static void afs_cm_destructor(struct afs_call *);
26 static void SRXAFSCB_CallBack(struct work_struct *);
27 static void SRXAFSCB_InitCallBackState(struct work_struct *);
28 static void SRXAFSCB_Probe(struct work_struct *);
29 static void SRXAFSCB_ProbeUuid(struct work_struct *);
30 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
31
32 static int afs_deliver_yfs_cb_callback(struct afs_call *);
33
34 /*
35 * CB.CallBack operation type
36 */
37 static 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 */
47 static 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 */
57 static 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 */
67 static 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 */
77 static 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 */
87 static 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 */
97 static 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 */
108 bool 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 */
145 static 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 */
167 static 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 */
187 static 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 */
196 static 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 */
207 static 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 */
233 static 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 */
334 static 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 */
350 static 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 */
369 static 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 */
432 static 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 */
445 static 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 */
465 static 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 */
484 static 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 */
542 static 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 */
583 static 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 */
602 static 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 }
676
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