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 atomic_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 case 5:
315 break;
316 }
317
318 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
319 return afs_io_error(call, afs_io_error_cm_reply);
320
321 /* we'll need the file server record as that tells us which set of
322 * vnodes to operate upon */
323 return afs_find_cm_server_by_peer(call);
324 }
325
326 /*
327 * allow the fileserver to request callback state (re-)initialisation
328 */
SRXAFSCB_InitCallBackState(struct work_struct * work)329 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
330 {
331 struct afs_call *call = container_of(work, struct afs_call, work);
332
333 _enter("{%p}", call->server);
334
335 if (call->server)
336 afs_init_callback_state(call->server);
337 afs_send_empty_reply(call);
338 afs_put_call(call);
339 _leave("");
340 }
341
342 /*
343 * deliver request data to a CB.InitCallBackState call
344 */
afs_deliver_cb_init_call_back_state(struct afs_call * call)345 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
346 {
347 int ret;
348
349 _enter("");
350
351 afs_extract_discard(call, 0);
352 ret = afs_extract_data(call, false);
353 if (ret < 0)
354 return ret;
355
356 /* we'll need the file server record as that tells us which set of
357 * vnodes to operate upon */
358 return afs_find_cm_server_by_peer(call);
359 }
360
361 /*
362 * deliver request data to a CB.InitCallBackState3 call
363 */
afs_deliver_cb_init_call_back_state3(struct afs_call * call)364 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
365 {
366 struct afs_uuid *r;
367 unsigned loop;
368 __be32 *b;
369 int ret;
370
371 _enter("");
372
373 _enter("{%u}", call->unmarshall);
374
375 switch (call->unmarshall) {
376 case 0:
377 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
378 if (!call->buffer)
379 return -ENOMEM;
380 afs_extract_to_buf(call, 11 * sizeof(__be32));
381 call->unmarshall++;
382
383 fallthrough;
384 case 1:
385 _debug("extract UUID");
386 ret = afs_extract_data(call, false);
387 switch (ret) {
388 case 0: break;
389 case -EAGAIN: return 0;
390 default: return ret;
391 }
392
393 _debug("unmarshall UUID");
394 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
395 if (!call->request)
396 return -ENOMEM;
397
398 b = call->buffer;
399 r = call->request;
400 r->time_low = b[0];
401 r->time_mid = htons(ntohl(b[1]));
402 r->time_hi_and_version = htons(ntohl(b[2]));
403 r->clock_seq_hi_and_reserved = ntohl(b[3]);
404 r->clock_seq_low = ntohl(b[4]);
405
406 for (loop = 0; loop < 6; loop++)
407 r->node[loop] = ntohl(b[loop + 5]);
408
409 call->unmarshall++;
410
411 case 2:
412 break;
413 }
414
415 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
416 return afs_io_error(call, afs_io_error_cm_reply);
417
418 /* we'll need the file server record as that tells us which set of
419 * vnodes to operate upon */
420 return afs_find_cm_server_by_uuid(call, call->request);
421 }
422
423 /*
424 * allow the fileserver to see if the cache manager is still alive
425 */
SRXAFSCB_Probe(struct work_struct * work)426 static void SRXAFSCB_Probe(struct work_struct *work)
427 {
428 struct afs_call *call = container_of(work, struct afs_call, work);
429
430 _enter("");
431 afs_send_empty_reply(call);
432 afs_put_call(call);
433 _leave("");
434 }
435
436 /*
437 * deliver request data to a CB.Probe call
438 */
afs_deliver_cb_probe(struct afs_call * call)439 static int afs_deliver_cb_probe(struct afs_call *call)
440 {
441 int ret;
442
443 _enter("");
444
445 afs_extract_discard(call, 0);
446 ret = afs_extract_data(call, false);
447 if (ret < 0)
448 return ret;
449
450 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
451 return afs_io_error(call, afs_io_error_cm_reply);
452 return afs_find_cm_server_by_peer(call);
453 }
454
455 /*
456 * Allow the fileserver to quickly find out if the cache manager has been
457 * rebooted.
458 */
SRXAFSCB_ProbeUuid(struct work_struct * work)459 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
460 {
461 struct afs_call *call = container_of(work, struct afs_call, work);
462 struct afs_uuid *r = call->request;
463
464 _enter("");
465
466 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
467 afs_send_empty_reply(call);
468 else
469 afs_abort_service_call(call, 1, 1, "K-1");
470
471 afs_put_call(call);
472 _leave("");
473 }
474
475 /*
476 * deliver request data to a CB.ProbeUuid call
477 */
afs_deliver_cb_probe_uuid(struct afs_call * call)478 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
479 {
480 struct afs_uuid *r;
481 unsigned loop;
482 __be32 *b;
483 int ret;
484
485 _enter("{%u}", call->unmarshall);
486
487 switch (call->unmarshall) {
488 case 0:
489 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
490 if (!call->buffer)
491 return -ENOMEM;
492 afs_extract_to_buf(call, 11 * sizeof(__be32));
493 call->unmarshall++;
494
495 fallthrough;
496 case 1:
497 _debug("extract UUID");
498 ret = afs_extract_data(call, false);
499 switch (ret) {
500 case 0: break;
501 case -EAGAIN: return 0;
502 default: return ret;
503 }
504
505 _debug("unmarshall UUID");
506 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
507 if (!call->request)
508 return -ENOMEM;
509
510 b = call->buffer;
511 r = call->request;
512 r->time_low = b[0];
513 r->time_mid = htons(ntohl(b[1]));
514 r->time_hi_and_version = htons(ntohl(b[2]));
515 r->clock_seq_hi_and_reserved = ntohl(b[3]);
516 r->clock_seq_low = ntohl(b[4]);
517
518 for (loop = 0; loop < 6; loop++)
519 r->node[loop] = ntohl(b[loop + 5]);
520
521 call->unmarshall++;
522
523 case 2:
524 break;
525 }
526
527 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
528 return afs_io_error(call, afs_io_error_cm_reply);
529 return afs_find_cm_server_by_peer(call);
530 }
531
532 /*
533 * allow the fileserver to ask about the cache manager's capabilities
534 */
SRXAFSCB_TellMeAboutYourself(struct work_struct * work)535 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
536 {
537 struct afs_call *call = container_of(work, struct afs_call, work);
538 int loop;
539
540 struct {
541 struct /* InterfaceAddr */ {
542 __be32 nifs;
543 __be32 uuid[11];
544 __be32 ifaddr[32];
545 __be32 netmask[32];
546 __be32 mtu[32];
547 } ia;
548 struct /* Capabilities */ {
549 __be32 capcount;
550 __be32 caps[1];
551 } cap;
552 } reply;
553
554 _enter("");
555
556 memset(&reply, 0, sizeof(reply));
557
558 reply.ia.uuid[0] = call->net->uuid.time_low;
559 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
560 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
561 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
562 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
563 for (loop = 0; loop < 6; loop++)
564 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
565
566 reply.cap.capcount = htonl(1);
567 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
568 afs_send_simple_reply(call, &reply, sizeof(reply));
569 afs_put_call(call);
570 _leave("");
571 }
572
573 /*
574 * deliver request data to a CB.TellMeAboutYourself call
575 */
afs_deliver_cb_tell_me_about_yourself(struct afs_call * call)576 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
577 {
578 int ret;
579
580 _enter("");
581
582 afs_extract_discard(call, 0);
583 ret = afs_extract_data(call, false);
584 if (ret < 0)
585 return ret;
586
587 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
588 return afs_io_error(call, afs_io_error_cm_reply);
589 return afs_find_cm_server_by_peer(call);
590 }
591
592 /*
593 * deliver request data to a YFS CB.CallBack call
594 */
afs_deliver_yfs_cb_callback(struct afs_call * call)595 static int afs_deliver_yfs_cb_callback(struct afs_call *call)
596 {
597 struct afs_callback_break *cb;
598 struct yfs_xdr_YFSFid *bp;
599 size_t size;
600 int ret, loop;
601
602 _enter("{%u}", call->unmarshall);
603
604 switch (call->unmarshall) {
605 case 0:
606 afs_extract_to_tmp(call);
607 call->unmarshall++;
608
609 /* extract the FID array and its count in two steps */
610 fallthrough;
611 case 1:
612 _debug("extract FID count");
613 ret = afs_extract_data(call, true);
614 if (ret < 0)
615 return ret;
616
617 call->count = ntohl(call->tmp);
618 _debug("FID count: %u", call->count);
619 if (call->count > YFSCBMAX)
620 return afs_protocol_error(call, afs_eproto_cb_fid_count);
621
622 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
623 call->buffer = kmalloc(size, GFP_KERNEL);
624 if (!call->buffer)
625 return -ENOMEM;
626 afs_extract_to_buf(call, size);
627 call->unmarshall++;
628
629 fallthrough;
630 case 2:
631 _debug("extract FID array");
632 ret = afs_extract_data(call, false);
633 if (ret < 0)
634 return ret;
635
636 _debug("unmarshall FID array");
637 call->request = kcalloc(call->count,
638 sizeof(struct afs_callback_break),
639 GFP_KERNEL);
640 if (!call->request)
641 return -ENOMEM;
642
643 cb = call->request;
644 bp = call->buffer;
645 for (loop = call->count; loop > 0; loop--, cb++) {
646 cb->fid.vid = xdr_to_u64(bp->volume);
647 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
648 cb->fid.vnode_hi = ntohl(bp->vnode.hi);
649 cb->fid.unique = ntohl(bp->vnode.unique);
650 bp++;
651 }
652
653 afs_extract_to_tmp(call);
654 call->unmarshall++;
655
656 case 3:
657 break;
658 }
659
660 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
661 return afs_io_error(call, afs_io_error_cm_reply);
662
663 /* We'll need the file server record as that tells us which set of
664 * vnodes to operate upon.
665 */
666 return afs_find_cm_server_by_peer(call);
667 }
668