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