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 */
afs_cm_incoming_call(struct afs_call * call)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 */
afs_find_cm_server_by_peer(struct afs_call * call)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
150 rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
151
152 server = afs_find_server(call->net, &srx);
153 if (!server) {
154 trace_afs_cm_no_server(call, &srx);
155 return 0;
156 }
157
158 call->server = server;
159 return 0;
160 }
161
162 /*
163 * Find the server record by server UUID and record a probe to the cache
164 * manager from a server.
165 */
afs_find_cm_server_by_uuid(struct afs_call * call,struct afs_uuid * uuid)166 static int afs_find_cm_server_by_uuid(struct afs_call *call,
167 struct afs_uuid *uuid)
168 {
169 struct afs_server *server;
170
171 rcu_read_lock();
172 server = afs_find_server_by_uuid(call->net, call->request);
173 rcu_read_unlock();
174 if (!server) {
175 trace_afs_cm_no_server_u(call, call->request);
176 return 0;
177 }
178
179 call->server = server;
180 return 0;
181 }
182
183 /*
184 * Clean up a cache manager call.
185 */
afs_cm_destructor(struct afs_call * call)186 static void afs_cm_destructor(struct afs_call *call)
187 {
188 kfree(call->buffer);
189 call->buffer = NULL;
190 }
191
192 /*
193 * Abort a service call from within an action function.
194 */
afs_abort_service_call(struct afs_call * call,u32 abort_code,int error,enum rxrpc_abort_reason why)195 static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
196 enum rxrpc_abort_reason why)
197 {
198 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
199 abort_code, error, why);
200 afs_set_call_complete(call, error, 0);
201 }
202
203 /*
204 * The server supplied a list of callbacks that it wanted to break.
205 */
SRXAFSCB_CallBack(struct work_struct * work)206 static void SRXAFSCB_CallBack(struct work_struct *work)
207 {
208 struct afs_call *call = container_of(work, struct afs_call, work);
209
210 _enter("");
211
212 /* We need to break the callbacks before sending the reply as the
213 * server holds up change visibility till it receives our reply so as
214 * to maintain cache coherency.
215 */
216 if (call->server) {
217 trace_afs_server(call->server->debug_id,
218 refcount_read(&call->server->ref),
219 atomic_read(&call->server->active),
220 afs_server_trace_callback);
221 afs_break_callbacks(call->server, call->count, call->request);
222 }
223
224 afs_send_empty_reply(call);
225 afs_put_call(call);
226 _leave("");
227 }
228
229 /*
230 * deliver request data to a CB.CallBack call
231 */
afs_deliver_cb_callback(struct afs_call * call)232 static int afs_deliver_cb_callback(struct afs_call *call)
233 {
234 struct afs_callback_break *cb;
235 __be32 *bp;
236 int ret, loop;
237
238 _enter("{%u}", call->unmarshall);
239
240 switch (call->unmarshall) {
241 case 0:
242 afs_extract_to_tmp(call);
243 call->unmarshall++;
244
245 /* extract the FID array and its count in two steps */
246 fallthrough;
247 case 1:
248 _debug("extract FID count");
249 ret = afs_extract_data(call, true);
250 if (ret < 0)
251 return ret;
252
253 call->count = ntohl(call->tmp);
254 _debug("FID count: %u", call->count);
255 if (call->count > AFSCBMAX)
256 return afs_protocol_error(call, afs_eproto_cb_fid_count);
257
258 call->buffer = kmalloc(array3_size(call->count, 3, 4),
259 GFP_KERNEL);
260 if (!call->buffer)
261 return -ENOMEM;
262 afs_extract_to_buf(call, call->count * 3 * 4);
263 call->unmarshall++;
264
265 fallthrough;
266 case 2:
267 _debug("extract FID array");
268 ret = afs_extract_data(call, true);
269 if (ret < 0)
270 return ret;
271
272 _debug("unmarshall FID array");
273 call->request = kcalloc(call->count,
274 sizeof(struct afs_callback_break),
275 GFP_KERNEL);
276 if (!call->request)
277 return -ENOMEM;
278
279 cb = call->request;
280 bp = call->buffer;
281 for (loop = call->count; loop > 0; loop--, cb++) {
282 cb->fid.vid = ntohl(*bp++);
283 cb->fid.vnode = ntohl(*bp++);
284 cb->fid.unique = ntohl(*bp++);
285 }
286
287 afs_extract_to_tmp(call);
288 call->unmarshall++;
289
290 /* extract the callback array and its count in two steps */
291 fallthrough;
292 case 3:
293 _debug("extract CB count");
294 ret = afs_extract_data(call, true);
295 if (ret < 0)
296 return ret;
297
298 call->count2 = ntohl(call->tmp);
299 _debug("CB count: %u", call->count2);
300 if (call->count2 != call->count && call->count2 != 0)
301 return afs_protocol_error(call, afs_eproto_cb_count);
302 call->iter = &call->def_iter;
303 iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
304 call->unmarshall++;
305
306 fallthrough;
307 case 4:
308 _debug("extract discard %zu/%u",
309 iov_iter_count(call->iter), call->count2 * 3 * 4);
310
311 ret = afs_extract_data(call, false);
312 if (ret < 0)
313 return ret;
314
315 call->unmarshall++;
316 fallthrough;
317
318 case 5:
319 break;
320 }
321
322 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
323 return afs_io_error(call, afs_io_error_cm_reply);
324
325 /* we'll need the file server record as that tells us which set of
326 * vnodes to operate upon */
327 return afs_find_cm_server_by_peer(call);
328 }
329
330 /*
331 * allow the fileserver to request callback state (re-)initialisation
332 */
SRXAFSCB_InitCallBackState(struct work_struct * work)333 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
334 {
335 struct afs_call *call = container_of(work, struct afs_call, work);
336
337 _enter("{%p}", call->server);
338
339 if (call->server)
340 afs_init_callback_state(call->server);
341 afs_send_empty_reply(call);
342 afs_put_call(call);
343 _leave("");
344 }
345
346 /*
347 * deliver request data to a CB.InitCallBackState call
348 */
afs_deliver_cb_init_call_back_state(struct afs_call * call)349 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
350 {
351 int ret;
352
353 _enter("");
354
355 afs_extract_discard(call, 0);
356 ret = afs_extract_data(call, false);
357 if (ret < 0)
358 return ret;
359
360 /* we'll need the file server record as that tells us which set of
361 * vnodes to operate upon */
362 return afs_find_cm_server_by_peer(call);
363 }
364
365 /*
366 * deliver request data to a CB.InitCallBackState3 call
367 */
afs_deliver_cb_init_call_back_state3(struct afs_call * call)368 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
369 {
370 struct afs_uuid *r;
371 unsigned loop;
372 __be32 *b;
373 int ret;
374
375 _enter("");
376
377 _enter("{%u}", call->unmarshall);
378
379 switch (call->unmarshall) {
380 case 0:
381 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
382 if (!call->buffer)
383 return -ENOMEM;
384 afs_extract_to_buf(call, 11 * sizeof(__be32));
385 call->unmarshall++;
386
387 fallthrough;
388 case 1:
389 _debug("extract UUID");
390 ret = afs_extract_data(call, false);
391 switch (ret) {
392 case 0: break;
393 case -EAGAIN: return 0;
394 default: return ret;
395 }
396
397 _debug("unmarshall UUID");
398 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
399 if (!call->request)
400 return -ENOMEM;
401
402 b = call->buffer;
403 r = call->request;
404 r->time_low = b[0];
405 r->time_mid = htons(ntohl(b[1]));
406 r->time_hi_and_version = htons(ntohl(b[2]));
407 r->clock_seq_hi_and_reserved = ntohl(b[3]);
408 r->clock_seq_low = ntohl(b[4]);
409
410 for (loop = 0; loop < 6; loop++)
411 r->node[loop] = ntohl(b[loop + 5]);
412
413 call->unmarshall++;
414 fallthrough;
415
416 case 2:
417 break;
418 }
419
420 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
421 return afs_io_error(call, afs_io_error_cm_reply);
422
423 /* we'll need the file server record as that tells us which set of
424 * vnodes to operate upon */
425 return afs_find_cm_server_by_uuid(call, call->request);
426 }
427
428 /*
429 * allow the fileserver to see if the cache manager is still alive
430 */
SRXAFSCB_Probe(struct work_struct * work)431 static void SRXAFSCB_Probe(struct work_struct *work)
432 {
433 struct afs_call *call = container_of(work, struct afs_call, work);
434
435 _enter("");
436 afs_send_empty_reply(call);
437 afs_put_call(call);
438 _leave("");
439 }
440
441 /*
442 * deliver request data to a CB.Probe call
443 */
afs_deliver_cb_probe(struct afs_call * call)444 static int afs_deliver_cb_probe(struct afs_call *call)
445 {
446 int ret;
447
448 _enter("");
449
450 afs_extract_discard(call, 0);
451 ret = afs_extract_data(call, false);
452 if (ret < 0)
453 return ret;
454
455 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
456 return afs_io_error(call, afs_io_error_cm_reply);
457 return afs_find_cm_server_by_peer(call);
458 }
459
460 /*
461 * Allow the fileserver to quickly find out if the cache manager has been
462 * rebooted.
463 */
SRXAFSCB_ProbeUuid(struct work_struct * work)464 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
465 {
466 struct afs_call *call = container_of(work, struct afs_call, work);
467 struct afs_uuid *r = call->request;
468
469 _enter("");
470
471 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
472 afs_send_empty_reply(call);
473 else
474 afs_abort_service_call(call, 1, 1, afs_abort_probeuuid_negative);
475
476 afs_put_call(call);
477 _leave("");
478 }
479
480 /*
481 * deliver request data to a CB.ProbeUuid call
482 */
afs_deliver_cb_probe_uuid(struct afs_call * call)483 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
484 {
485 struct afs_uuid *r;
486 unsigned loop;
487 __be32 *b;
488 int ret;
489
490 _enter("{%u}", call->unmarshall);
491
492 switch (call->unmarshall) {
493 case 0:
494 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
495 if (!call->buffer)
496 return -ENOMEM;
497 afs_extract_to_buf(call, 11 * sizeof(__be32));
498 call->unmarshall++;
499
500 fallthrough;
501 case 1:
502 _debug("extract UUID");
503 ret = afs_extract_data(call, false);
504 switch (ret) {
505 case 0: break;
506 case -EAGAIN: return 0;
507 default: return ret;
508 }
509
510 _debug("unmarshall UUID");
511 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
512 if (!call->request)
513 return -ENOMEM;
514
515 b = call->buffer;
516 r = call->request;
517 r->time_low = b[0];
518 r->time_mid = htons(ntohl(b[1]));
519 r->time_hi_and_version = htons(ntohl(b[2]));
520 r->clock_seq_hi_and_reserved = ntohl(b[3]);
521 r->clock_seq_low = ntohl(b[4]);
522
523 for (loop = 0; loop < 6; loop++)
524 r->node[loop] = ntohl(b[loop + 5]);
525
526 call->unmarshall++;
527 fallthrough;
528
529 case 2:
530 break;
531 }
532
533 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
534 return afs_io_error(call, afs_io_error_cm_reply);
535 return afs_find_cm_server_by_peer(call);
536 }
537
538 /*
539 * allow the fileserver to ask about the cache manager's capabilities
540 */
SRXAFSCB_TellMeAboutYourself(struct work_struct * work)541 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
542 {
543 struct afs_call *call = container_of(work, struct afs_call, work);
544 int loop;
545
546 struct {
547 struct /* InterfaceAddr */ {
548 __be32 nifs;
549 __be32 uuid[11];
550 __be32 ifaddr[32];
551 __be32 netmask[32];
552 __be32 mtu[32];
553 } ia;
554 struct /* Capabilities */ {
555 __be32 capcount;
556 __be32 caps[1];
557 } cap;
558 } reply;
559
560 _enter("");
561
562 memset(&reply, 0, sizeof(reply));
563
564 reply.ia.uuid[0] = call->net->uuid.time_low;
565 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
566 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
567 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
568 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
569 for (loop = 0; loop < 6; loop++)
570 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
571
572 reply.cap.capcount = htonl(1);
573 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
574 afs_send_simple_reply(call, &reply, sizeof(reply));
575 afs_put_call(call);
576 _leave("");
577 }
578
579 /*
580 * deliver request data to a CB.TellMeAboutYourself call
581 */
afs_deliver_cb_tell_me_about_yourself(struct afs_call * call)582 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
583 {
584 int ret;
585
586 _enter("");
587
588 afs_extract_discard(call, 0);
589 ret = afs_extract_data(call, false);
590 if (ret < 0)
591 return ret;
592
593 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
594 return afs_io_error(call, afs_io_error_cm_reply);
595 return afs_find_cm_server_by_peer(call);
596 }
597
598 /*
599 * deliver request data to a YFS CB.CallBack call
600 */
afs_deliver_yfs_cb_callback(struct afs_call * call)601 static int afs_deliver_yfs_cb_callback(struct afs_call *call)
602 {
603 struct afs_callback_break *cb;
604 struct yfs_xdr_YFSFid *bp;
605 size_t size;
606 int ret, loop;
607
608 _enter("{%u}", call->unmarshall);
609
610 switch (call->unmarshall) {
611 case 0:
612 afs_extract_to_tmp(call);
613 call->unmarshall++;
614
615 /* extract the FID array and its count in two steps */
616 fallthrough;
617 case 1:
618 _debug("extract FID count");
619 ret = afs_extract_data(call, true);
620 if (ret < 0)
621 return ret;
622
623 call->count = ntohl(call->tmp);
624 _debug("FID count: %u", call->count);
625 if (call->count > YFSCBMAX)
626 return afs_protocol_error(call, afs_eproto_cb_fid_count);
627
628 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
629 call->buffer = kmalloc(size, GFP_KERNEL);
630 if (!call->buffer)
631 return -ENOMEM;
632 afs_extract_to_buf(call, size);
633 call->unmarshall++;
634
635 fallthrough;
636 case 2:
637 _debug("extract FID array");
638 ret = afs_extract_data(call, false);
639 if (ret < 0)
640 return ret;
641
642 _debug("unmarshall FID array");
643 call->request = kcalloc(call->count,
644 sizeof(struct afs_callback_break),
645 GFP_KERNEL);
646 if (!call->request)
647 return -ENOMEM;
648
649 cb = call->request;
650 bp = call->buffer;
651 for (loop = call->count; loop > 0; loop--, cb++) {
652 cb->fid.vid = xdr_to_u64(bp->volume);
653 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
654 cb->fid.vnode_hi = ntohl(bp->vnode.hi);
655 cb->fid.unique = ntohl(bp->vnode.unique);
656 bp++;
657 }
658
659 afs_extract_to_tmp(call);
660 call->unmarshall++;
661 fallthrough;
662
663 case 3:
664 break;
665 }
666
667 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
668 return afs_io_error(call, afs_io_error_cm_reply);
669
670 /* We'll need the file server record as that tells us which set of
671 * vnodes to operate upon.
672 */
673 return afs_find_cm_server_by_peer(call);
674 }
675