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 */
afs_cm_incoming_call(struct afs_call * call)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 */
afs_cm_destructor(struct afs_call * call)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 */
SRXAFSCB_CallBack(struct work_struct * work)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 */
afs_deliver_cb_callback(struct afs_call * call)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 */
SRXAFSCB_InitCallBackState(struct work_struct * work)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 */
afs_deliver_cb_init_call_back_state(struct afs_call * call)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 */
afs_deliver_cb_init_call_back_state3(struct afs_call * call)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 */
SRXAFSCB_Probe(struct work_struct * work)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 */
afs_deliver_cb_probe(struct afs_call * call)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 */
SRXAFSCB_ProbeUuid(struct work_struct * work)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 */
afs_deliver_cb_probe_uuid(struct afs_call * call)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 */
SRXAFSCB_TellMeAboutYourself(struct work_struct * work)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 */
afs_deliver_cb_tell_me_about_yourself(struct afs_call * call)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 }
578