GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / afs / cmservice.c
1 /* AFS Cache Manager Service
2  *
3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/sched.h>
16 #include <linux/ip.h>
17 #include "internal.h"
18 #include "afs_cm.h"
19
20 static int afs_deliver_cb_init_call_back_state(struct afs_call *);
21 static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
22 static int afs_deliver_cb_probe(struct afs_call *);
23 static int afs_deliver_cb_callback(struct afs_call *);
24 static int afs_deliver_cb_probe_uuid(struct afs_call *);
25 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
26 static void afs_cm_destructor(struct afs_call *);
27 static void SRXAFSCB_CallBack(struct work_struct *);
28 static void SRXAFSCB_InitCallBackState(struct work_struct *);
29 static void SRXAFSCB_Probe(struct work_struct *);
30 static void SRXAFSCB_ProbeUuid(struct work_struct *);
31 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
32
33 #define CM_NAME(name) \
34         const char afs_SRXCB##name##_name[] __tracepoint_string =       \
35                 "CB." #name
36
37 /*
38  * CB.CallBack operation type
39  */
40 static CM_NAME(CallBack);
41 static const struct afs_call_type afs_SRXCBCallBack = {
42         .name           = afs_SRXCBCallBack_name,
43         .deliver        = afs_deliver_cb_callback,
44         .destructor     = afs_cm_destructor,
45         .work           = SRXAFSCB_CallBack,
46 };
47
48 /*
49  * CB.InitCallBackState operation type
50  */
51 static CM_NAME(InitCallBackState);
52 static const struct afs_call_type afs_SRXCBInitCallBackState = {
53         .name           = afs_SRXCBInitCallBackState_name,
54         .deliver        = afs_deliver_cb_init_call_back_state,
55         .destructor     = afs_cm_destructor,
56         .work           = SRXAFSCB_InitCallBackState,
57 };
58
59 /*
60  * CB.InitCallBackState3 operation type
61  */
62 static CM_NAME(InitCallBackState3);
63 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
64         .name           = afs_SRXCBInitCallBackState3_name,
65         .deliver        = afs_deliver_cb_init_call_back_state3,
66         .destructor     = afs_cm_destructor,
67         .work           = SRXAFSCB_InitCallBackState,
68 };
69
70 /*
71  * CB.Probe operation type
72  */
73 static CM_NAME(Probe);
74 static const struct afs_call_type afs_SRXCBProbe = {
75         .name           = afs_SRXCBProbe_name,
76         .deliver        = afs_deliver_cb_probe,
77         .destructor     = afs_cm_destructor,
78         .work           = SRXAFSCB_Probe,
79 };
80
81 /*
82  * CB.ProbeUuid operation type
83  */
84 static CM_NAME(ProbeUuid);
85 static const struct afs_call_type afs_SRXCBProbeUuid = {
86         .name           = afs_SRXCBProbeUuid_name,
87         .deliver        = afs_deliver_cb_probe_uuid,
88         .destructor     = afs_cm_destructor,
89         .work           = SRXAFSCB_ProbeUuid,
90 };
91
92 /*
93  * CB.TellMeAboutYourself operation type
94  */
95 static CM_NAME(TellMeAboutYourself);
96 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
97         .name           = afs_SRXCBTellMeAboutYourself_name,
98         .deliver        = afs_deliver_cb_tell_me_about_yourself,
99         .destructor     = afs_cm_destructor,
100         .work           = SRXAFSCB_TellMeAboutYourself,
101 };
102
103 /*
104  * route an incoming cache manager call
105  * - return T if supported, F if not
106  */
107 bool afs_cm_incoming_call(struct afs_call *call)
108 {
109         _enter("{CB.OP %u}", call->operation_ID);
110
111         switch (call->operation_ID) {
112         case CBCallBack:
113                 call->type = &afs_SRXCBCallBack;
114                 return true;
115         case CBInitCallBackState:
116                 call->type = &afs_SRXCBInitCallBackState;
117                 return true;
118         case CBInitCallBackState3:
119                 call->type = &afs_SRXCBInitCallBackState3;
120                 return true;
121         case CBProbe:
122                 call->type = &afs_SRXCBProbe;
123                 return true;
124         case CBProbeUuid:
125                 call->type = &afs_SRXCBProbeUuid;
126                 return true;
127         case CBTellMeAboutYourself:
128                 call->type = &afs_SRXCBTellMeAboutYourself;
129                 return true;
130         default:
131                 return false;
132         }
133 }
134
135 /*
136  * Clean up a cache manager call.
137  */
138 static void afs_cm_destructor(struct afs_call *call)
139 {
140         kfree(call->buffer);
141         call->buffer = NULL;
142 }
143
144 /*
145  * The server supplied a list of callbacks that it wanted to break.
146  */
147 static void SRXAFSCB_CallBack(struct work_struct *work)
148 {
149         struct afs_call *call = container_of(work, struct afs_call, work);
150
151         _enter("");
152
153         /* We need to break the callbacks before sending the reply as the
154          * server holds up change visibility till it receives our reply so as
155          * to maintain cache coherency.
156          */
157         if (call->cm_server)
158                 afs_break_callbacks(call->cm_server, call->count, call->request);
159
160         afs_send_empty_reply(call);
161         afs_put_call(call);
162         _leave("");
163 }
164
165 /*
166  * deliver request data to a CB.CallBack call
167  */
168 static int afs_deliver_cb_callback(struct afs_call *call)
169 {
170         struct afs_callback_break *cb;
171         struct sockaddr_rxrpc srx;
172         __be32 *bp;
173         int ret, loop;
174
175         _enter("{%u}", call->unmarshall);
176
177         switch (call->unmarshall) {
178         case 0:
179                 call->offset = 0;
180                 call->unmarshall++;
181
182                 /* extract the FID array and its count in two steps */
183         case 1:
184                 _debug("extract FID count");
185                 ret = afs_extract_data(call, &call->tmp, 4, true);
186                 if (ret < 0)
187                         return ret;
188
189                 call->count = ntohl(call->tmp);
190                 _debug("FID count: %u", call->count);
191                 if (call->count > AFSCBMAX)
192                         return afs_protocol_error(call, -EBADMSG);
193
194                 call->buffer = kmalloc(array3_size(call->count, 3, 4),
195                                        GFP_KERNEL);
196                 if (!call->buffer)
197                         return -ENOMEM;
198                 call->offset = 0;
199                 call->unmarshall++;
200
201         case 2:
202                 _debug("extract FID array");
203                 ret = afs_extract_data(call, call->buffer,
204                                        call->count * 3 * 4, true);
205                 if (ret < 0)
206                         return ret;
207
208                 _debug("unmarshall FID array");
209                 call->request = kcalloc(call->count,
210                                         sizeof(struct afs_callback_break),
211                                         GFP_KERNEL);
212                 if (!call->request)
213                         return -ENOMEM;
214
215                 cb = call->request;
216                 bp = call->buffer;
217                 for (loop = call->count; loop > 0; loop--, cb++) {
218                         cb->fid.vid     = ntohl(*bp++);
219                         cb->fid.vnode   = ntohl(*bp++);
220                         cb->fid.unique  = ntohl(*bp++);
221                         cb->cb.type     = AFSCM_CB_UNTYPED;
222                 }
223
224                 call->offset = 0;
225                 call->unmarshall++;
226
227                 /* extract the callback array and its count in two steps */
228         case 3:
229                 _debug("extract CB count");
230                 ret = afs_extract_data(call, &call->tmp, 4, true);
231                 if (ret < 0)
232                         return ret;
233
234                 call->count2 = ntohl(call->tmp);
235                 _debug("CB count: %u", call->count2);
236                 if (call->count2 != call->count && call->count2 != 0)
237                         return afs_protocol_error(call, -EBADMSG);
238                 call->offset = 0;
239                 call->unmarshall++;
240
241         case 4:
242                 _debug("extract CB array");
243                 ret = afs_extract_data(call, call->buffer,
244                                        call->count2 * 3 * 4, false);
245                 if (ret < 0)
246                         return ret;
247
248                 _debug("unmarshall CB array");
249                 cb = call->request;
250                 bp = call->buffer;
251                 for (loop = call->count2; loop > 0; loop--, cb++) {
252                         cb->cb.version  = ntohl(*bp++);
253                         cb->cb.expiry   = ntohl(*bp++);
254                         cb->cb.type     = ntohl(*bp++);
255                 }
256
257                 call->offset = 0;
258                 call->unmarshall++;
259         case 5:
260                 break;
261         }
262
263         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
264                 return -EIO;
265
266         /* we'll need the file server record as that tells us which set of
267          * vnodes to operate upon */
268         rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
269         call->cm_server = afs_find_server(call->net, &srx);
270         if (!call->cm_server)
271                 trace_afs_cm_no_server(call, &srx);
272
273         return afs_queue_call_work(call);
274 }
275
276 /*
277  * allow the fileserver to request callback state (re-)initialisation
278  */
279 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
280 {
281         struct afs_call *call = container_of(work, struct afs_call, work);
282
283         _enter("{%p}", call->cm_server);
284
285         if (call->cm_server)
286                 afs_init_callback_state(call->cm_server);
287         afs_send_empty_reply(call);
288         afs_put_call(call);
289         _leave("");
290 }
291
292 /*
293  * deliver request data to a CB.InitCallBackState call
294  */
295 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
296 {
297         struct sockaddr_rxrpc srx;
298         int ret;
299
300         _enter("");
301
302         rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
303
304         ret = afs_extract_data(call, NULL, 0, false);
305         if (ret < 0)
306                 return ret;
307
308         /* we'll need the file server record as that tells us which set of
309          * vnodes to operate upon */
310         call->cm_server = afs_find_server(call->net, &srx);
311         if (!call->cm_server)
312                 trace_afs_cm_no_server(call, &srx);
313
314         return afs_queue_call_work(call);
315 }
316
317 /*
318  * deliver request data to a CB.InitCallBackState3 call
319  */
320 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
321 {
322         struct afs_uuid *r;
323         unsigned loop;
324         __be32 *b;
325         int ret;
326
327         _enter("");
328
329         _enter("{%u}", call->unmarshall);
330
331         switch (call->unmarshall) {
332         case 0:
333                 call->offset = 0;
334                 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
335                 if (!call->buffer)
336                         return -ENOMEM;
337                 call->unmarshall++;
338
339         case 1:
340                 _debug("extract UUID");
341                 ret = afs_extract_data(call, call->buffer,
342                                        11 * sizeof(__be32), false);
343                 switch (ret) {
344                 case 0:         break;
345                 case -EAGAIN:   return 0;
346                 default:        return ret;
347                 }
348
349                 _debug("unmarshall UUID");
350                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
351                 if (!call->request)
352                         return -ENOMEM;
353
354                 b = call->buffer;
355                 r = call->request;
356                 r->time_low                     = b[0];
357                 r->time_mid                     = htons(ntohl(b[1]));
358                 r->time_hi_and_version          = htons(ntohl(b[2]));
359                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
360                 r->clock_seq_low                = ntohl(b[4]);
361
362                 for (loop = 0; loop < 6; loop++)
363                         r->node[loop] = ntohl(b[loop + 5]);
364
365                 call->offset = 0;
366                 call->unmarshall++;
367
368         case 2:
369                 break;
370         }
371
372         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
373                 return -EIO;
374
375         /* we'll need the file server record as that tells us which set of
376          * vnodes to operate upon */
377         rcu_read_lock();
378         call->cm_server = afs_find_server_by_uuid(call->net, call->request);
379         rcu_read_unlock();
380         if (!call->cm_server)
381                 trace_afs_cm_no_server_u(call, call->request);
382
383         return afs_queue_call_work(call);
384 }
385
386 /*
387  * allow the fileserver to see if the cache manager is still alive
388  */
389 static void SRXAFSCB_Probe(struct work_struct *work)
390 {
391         struct afs_call *call = container_of(work, struct afs_call, work);
392
393         _enter("");
394         afs_send_empty_reply(call);
395         afs_put_call(call);
396         _leave("");
397 }
398
399 /*
400  * deliver request data to a CB.Probe call
401  */
402 static int afs_deliver_cb_probe(struct afs_call *call)
403 {
404         int ret;
405
406         _enter("");
407
408         ret = afs_extract_data(call, NULL, 0, false);
409         if (ret < 0)
410                 return ret;
411
412         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
413                 return -EIO;
414
415         return afs_queue_call_work(call);
416 }
417
418 /*
419  * allow the fileserver to quickly find out if the fileserver has been rebooted
420  */
421 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
422 {
423         struct afs_call *call = container_of(work, struct afs_call, work);
424         struct afs_uuid *r = call->request;
425
426         _enter("");
427
428         if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
429                 afs_send_empty_reply(call);
430         else
431                 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
432                                         1, 1, "K-1");
433
434         afs_put_call(call);
435         _leave("");
436 }
437
438 /*
439  * deliver request data to a CB.ProbeUuid call
440  */
441 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
442 {
443         struct afs_uuid *r;
444         unsigned loop;
445         __be32 *b;
446         int ret;
447
448         _enter("{%u}", call->unmarshall);
449
450         switch (call->unmarshall) {
451         case 0:
452                 call->offset = 0;
453                 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
454                 if (!call->buffer)
455                         return -ENOMEM;
456                 call->unmarshall++;
457
458         case 1:
459                 _debug("extract UUID");
460                 ret = afs_extract_data(call, call->buffer,
461                                        11 * sizeof(__be32), false);
462                 switch (ret) {
463                 case 0:         break;
464                 case -EAGAIN:   return 0;
465                 default:        return ret;
466                 }
467
468                 _debug("unmarshall UUID");
469                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
470                 if (!call->request)
471                         return -ENOMEM;
472
473                 b = call->buffer;
474                 r = call->request;
475                 r->time_low                     = b[0];
476                 r->time_mid                     = htons(ntohl(b[1]));
477                 r->time_hi_and_version          = htons(ntohl(b[2]));
478                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
479                 r->clock_seq_low                = ntohl(b[4]);
480
481                 for (loop = 0; loop < 6; loop++)
482                         r->node[loop] = ntohl(b[loop + 5]);
483
484                 call->offset = 0;
485                 call->unmarshall++;
486
487         case 2:
488                 break;
489         }
490
491         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
492                 return -EIO;
493
494         return afs_queue_call_work(call);
495 }
496
497 /*
498  * allow the fileserver to ask about the cache manager's capabilities
499  */
500 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
501 {
502         struct afs_interface *ifs;
503         struct afs_call *call = container_of(work, struct afs_call, work);
504         int loop, nifs;
505
506         struct {
507                 struct /* InterfaceAddr */ {
508                         __be32 nifs;
509                         __be32 uuid[11];
510                         __be32 ifaddr[32];
511                         __be32 netmask[32];
512                         __be32 mtu[32];
513                 } ia;
514                 struct /* Capabilities */ {
515                         __be32 capcount;
516                         __be32 caps[1];
517                 } cap;
518         } reply;
519
520         _enter("");
521
522         nifs = 0;
523         ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
524         if (ifs) {
525                 nifs = afs_get_ipv4_interfaces(call->net, ifs, 32, false);
526                 if (nifs < 0) {
527                         kfree(ifs);
528                         ifs = NULL;
529                         nifs = 0;
530                 }
531         }
532
533         memset(&reply, 0, sizeof(reply));
534         reply.ia.nifs = htonl(nifs);
535
536         reply.ia.uuid[0] = call->net->uuid.time_low;
537         reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
538         reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
539         reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
540         reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
541         for (loop = 0; loop < 6; loop++)
542                 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
543
544         if (ifs) {
545                 for (loop = 0; loop < nifs; loop++) {
546                         reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
547                         reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
548                         reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
549                 }
550                 kfree(ifs);
551         }
552
553         reply.cap.capcount = htonl(1);
554         reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
555         afs_send_simple_reply(call, &reply, sizeof(reply));
556         afs_put_call(call);
557         _leave("");
558 }
559
560 /*
561  * deliver request data to a CB.TellMeAboutYourself call
562  */
563 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
564 {
565         int ret;
566
567         _enter("");
568
569         ret = afs_extract_data(call, NULL, 0, false);
570         if (ret < 0)
571                 return ret;
572
573         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
574                 return -EIO;
575
576         return afs_queue_call_work(call);
577 }