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