cmservice.c

  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#define RXRPC_TRACE_ONLY_DEFINE_ENUMS
 17#include <trace/events/rxrpc.h>
 18
 19static int afs_deliver_cb_init_call_back_state(struct afs_call *);
 20static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
 21static int afs_deliver_cb_probe(struct afs_call *);
 22static int afs_deliver_cb_callback(struct afs_call *);
 23static int afs_deliver_cb_probe_uuid(struct afs_call *);
 24static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
 25static void afs_cm_destructor(struct afs_call *);
 26static void SRXAFSCB_CallBack(struct work_struct *);
 27static void SRXAFSCB_InitCallBackState(struct work_struct *);
 28static void SRXAFSCB_Probe(struct work_struct *);
 29static void SRXAFSCB_ProbeUuid(struct work_struct *);
 30static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
 31
 32static int afs_deliver_yfs_cb_callback(struct afs_call *);
 33
 34/*
 35 * CB.CallBack operation type
 36 */
 37static const struct afs_call_type afs_SRXCBCallBack = {
 38	.name		= "CB.CallBack",
 39	.deliver	= afs_deliver_cb_callback,
 40	.destructor	= afs_cm_destructor,
 41	.work		= SRXAFSCB_CallBack,
 42};
 43
 44/*
 45 * CB.InitCallBackState operation type
 46 */
 47static const struct afs_call_type afs_SRXCBInitCallBackState = {
 48	.name		= "CB.InitCallBackState",
 49	.deliver	= afs_deliver_cb_init_call_back_state,
 50	.destructor	= afs_cm_destructor,
 51	.work		= SRXAFSCB_InitCallBackState,
 52};
 53
 54/*
 55 * CB.InitCallBackState3 operation type
 56 */
 57static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
 58	.name		= "CB.InitCallBackState3",
 59	.deliver	= afs_deliver_cb_init_call_back_state3,
 60	.destructor	= afs_cm_destructor,
 61	.work		= SRXAFSCB_InitCallBackState,
 62};
 63
 64/*
 65 * CB.Probe operation type
 66 */
 67static const struct afs_call_type afs_SRXCBProbe = {
 68	.name		= "CB.Probe",
 69	.deliver	= afs_deliver_cb_probe,
 70	.destructor	= afs_cm_destructor,
 71	.work		= SRXAFSCB_Probe,
 72};
 73
 74/*
 75 * CB.ProbeUuid operation type
 76 */
 77static const struct afs_call_type afs_SRXCBProbeUuid = {
 78	.name		= "CB.ProbeUuid",
 79	.deliver	= afs_deliver_cb_probe_uuid,
 80	.destructor	= afs_cm_destructor,
 81	.work		= SRXAFSCB_ProbeUuid,
 82};
 83
 84/*
 85 * CB.TellMeAboutYourself operation type
 86 */
 87static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
 88	.name		= "CB.TellMeAboutYourself",
 89	.deliver	= afs_deliver_cb_tell_me_about_yourself,
 90	.destructor	= afs_cm_destructor,
 91	.work		= SRXAFSCB_TellMeAboutYourself,
 92};
 93
 94/*
 95 * YFS CB.CallBack operation type
 96 */
 97static const struct afs_call_type afs_SRXYFSCB_CallBack = {
 98	.name		= "YFSCB.CallBack",
 99	.deliver	= afs_deliver_yfs_cb_callback,
100	.destructor	= afs_cm_destructor,
101	.work		= SRXAFSCB_CallBack,
102};
103
104/*
105 * route an incoming cache manager call
106 * - return T if supported, F if not
107 */
108bool afs_cm_incoming_call(struct afs_call *call)
109{
110	_enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
111
112	switch (call->operation_ID) {
113	case CBCallBack:
114		call->type = &afs_SRXCBCallBack;
115		return true;
116	case CBInitCallBackState:
117		call->type = &afs_SRXCBInitCallBackState;
118		return true;
119	case CBInitCallBackState3:
120		call->type = &afs_SRXCBInitCallBackState3;
121		return true;
122	case CBProbe:
123		call->type = &afs_SRXCBProbe;
124		return true;
125	case CBProbeUuid:
126		call->type = &afs_SRXCBProbeUuid;
127		return true;
128	case CBTellMeAboutYourself:
129		call->type = &afs_SRXCBTellMeAboutYourself;
130		return true;
131	case YFSCBCallBack:
132		if (call->service_id != YFS_CM_SERVICE)
133			return false;
134		call->type = &afs_SRXYFSCB_CallBack;
135		return true;
136	default:
137		return false;
138	}
139}
140
141/*
142 * Clean up a cache manager call.
143 */
144static void afs_cm_destructor(struct afs_call *call)
145{
146	kfree(call->buffer);
147	call->buffer = NULL;
148}
149
150/*
151 * Abort a service call from within an action function.
152 */
153static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
154				   enum rxrpc_abort_reason why)
155{
156	rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
157				abort_code, error, why);
158	afs_set_call_complete(call, error, 0);
159}
160
161/*
162 * The server supplied a list of callbacks that it wanted to break.
163 */
164static void SRXAFSCB_CallBack(struct work_struct *work)
165{
166	struct afs_call *call = container_of(work, struct afs_call, work);
167
168	_enter("");
169
170	/* We need to break the callbacks before sending the reply as the
171	 * server holds up change visibility till it receives our reply so as
172	 * to maintain cache coherency.
173	 */
174	if (call->server) {
175		trace_afs_server(call->server->debug_id,
176				 refcount_read(&call->server->ref),
177				 atomic_read(&call->server->active),
178				 afs_server_trace_callback);
179		afs_break_callbacks(call->server, call->count, call->request);
180	}
181
182	afs_send_empty_reply(call);
183	afs_put_call(call);
184	_leave("");
185}
186
187/*
188 * deliver request data to a CB.CallBack call
189 */
190static int afs_deliver_cb_callback(struct afs_call *call)
191{
192	struct afs_callback_break *cb;
193	__be32 *bp;
194	int ret, loop;
195
196	_enter("{%u}", call->unmarshall);
197
198	switch (call->unmarshall) {
199	case 0:
200		afs_extract_to_tmp(call);
201		call->unmarshall++;
202
203		/* extract the FID array and its count in two steps */
204		fallthrough;
205	case 1:
206		_debug("extract FID count");
207		ret = afs_extract_data(call, true);
208		if (ret < 0)
209			return ret;
210
211		call->count = ntohl(call->tmp);
212		_debug("FID count: %u", call->count);
213		if (call->count > AFSCBMAX)
214			return afs_protocol_error(call, afs_eproto_cb_fid_count);
215
216		call->buffer = kmalloc(array3_size(call->count, 3, 4),
217				       GFP_KERNEL);
218		if (!call->buffer)
219			return -ENOMEM;
220		afs_extract_to_buf(call, call->count * 3 * 4);
221		call->unmarshall++;
222
223		fallthrough;
224	case 2:
225		_debug("extract FID array");
226		ret = afs_extract_data(call, true);
227		if (ret < 0)
228			return ret;
229
230		_debug("unmarshall FID array");
231		call->request = kcalloc(call->count,
232					sizeof(struct afs_callback_break),
233					GFP_KERNEL);
234		if (!call->request)
235			return -ENOMEM;
236
237		cb = call->request;
238		bp = call->buffer;
239		for (loop = call->count; loop > 0; loop--, cb++) {
240			cb->fid.vid	= ntohl(*bp++);
241			cb->fid.vnode	= ntohl(*bp++);
242			cb->fid.unique	= ntohl(*bp++);
243		}
244
245		afs_extract_to_tmp(call);
246		call->unmarshall++;
247
248		/* extract the callback array and its count in two steps */
249		fallthrough;
250	case 3:
251		_debug("extract CB count");
252		ret = afs_extract_data(call, true);
253		if (ret < 0)
254			return ret;
255
256		call->count2 = ntohl(call->tmp);
257		_debug("CB count: %u", call->count2);
258		if (call->count2 != call->count && call->count2 != 0)
259			return afs_protocol_error(call, afs_eproto_cb_count);
260		call->iter = &call->def_iter;
261		iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
262		call->unmarshall++;
263
264		fallthrough;
265	case 4:
266		_debug("extract discard %zu/%u",
267		       iov_iter_count(call->iter), call->count2 * 3 * 4);
268
269		ret = afs_extract_data(call, false);
270		if (ret < 0)
271			return ret;
272
273		call->unmarshall++;
274		fallthrough;
275
276	case 5:
277		break;
278	}
279
280	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
281		return afs_io_error(call, afs_io_error_cm_reply);
282	return 0;
283}
284
285/*
286 * allow the fileserver to request callback state (re-)initialisation
287 */
288static void SRXAFSCB_InitCallBackState(struct work_struct *work)
289{
290	struct afs_call *call = container_of(work, struct afs_call, work);
291
292	_enter("{%p}", call->server);
293
294	if (call->server)
295		afs_init_callback_state(call->server);
296	afs_send_empty_reply(call);
297	afs_put_call(call);
298	_leave("");
299}
300
301/*
302 * deliver request data to a CB.InitCallBackState call
303 */
304static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
305{
306	_enter("");
307
308	afs_extract_discard(call, 0);
309	return afs_extract_data(call, false);
310}
311
312/*
313 * deliver request data to a CB.InitCallBackState3 call
314 */
315static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
316{
317	struct afs_uuid *r;
318	unsigned loop;
319	__be32 *b;
320	int ret;
321
322	_enter("{%u}", call->unmarshall);
323
324	switch (call->unmarshall) {
325	case 0:
326		call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
327		if (!call->buffer)
328			return -ENOMEM;
329		afs_extract_to_buf(call, 11 * sizeof(__be32));
330		call->unmarshall++;
331
332		fallthrough;
333	case 1:
334		_debug("extract UUID");
335		ret = afs_extract_data(call, false);
336		switch (ret) {
337		case 0:		break;
338		case -EAGAIN:	return 0;
339		default:	return ret;
340		}
341
342		_debug("unmarshall UUID");
343		call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
344		if (!call->request)
345			return -ENOMEM;
346
347		b = call->buffer;
348		r = call->request;
349		r->time_low			= b[0];
350		r->time_mid			= htons(ntohl(b[1]));
351		r->time_hi_and_version		= htons(ntohl(b[2]));
352		r->clock_seq_hi_and_reserved 	= ntohl(b[3]);
353		r->clock_seq_low		= ntohl(b[4]);
354
355		for (loop = 0; loop < 6; loop++)
356			r->node[loop] = ntohl(b[loop + 5]);
357
358		call->unmarshall++;
359		fallthrough;
360
361	case 2:
362		break;
363	}
364
365	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
366		return afs_io_error(call, afs_io_error_cm_reply);
367
368	if (memcmp(call->request, &call->server->_uuid, sizeof(call->server->_uuid)) != 0) {
369		pr_notice("Callback UUID does not match fileserver UUID\n");
370		trace_afs_cm_no_server_u(call, call->request);
371		return 0;
372	}
373
374	return 0;
375}
376
377/*
378 * allow the fileserver to see if the cache manager is still alive
379 */
380static void SRXAFSCB_Probe(struct work_struct *work)
381{
382	struct afs_call *call = container_of(work, struct afs_call, work);
383
384	_enter("");
385	afs_send_empty_reply(call);
386	afs_put_call(call);
387	_leave("");
388}
389
390/*
391 * deliver request data to a CB.Probe call
392 */
393static int afs_deliver_cb_probe(struct afs_call *call)
394{
395	int ret;
396
397	_enter("");
398
399	afs_extract_discard(call, 0);
400	ret = afs_extract_data(call, false);
401	if (ret < 0)
402		return ret;
403
404	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
405		return afs_io_error(call, afs_io_error_cm_reply);
406	return 0;
407}
408
409/*
410 * Allow the fileserver to quickly find out if the cache manager has been
411 * rebooted.
412 */
413static void SRXAFSCB_ProbeUuid(struct work_struct *work)
414{
415	struct afs_call *call = container_of(work, struct afs_call, work);
416	struct afs_uuid *r = call->request;
417
418	_enter("");
419
420	if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
421		afs_send_empty_reply(call);
422	else
423		afs_abort_service_call(call, 1, 1, afs_abort_probeuuid_negative);
424
425	afs_put_call(call);
426	_leave("");
427}
428
429/*
430 * deliver request data to a CB.ProbeUuid call
431 */
432static int afs_deliver_cb_probe_uuid(struct afs_call *call)
433{
434	struct afs_uuid *r;
435	unsigned loop;
436	__be32 *b;
437	int ret;
438
439	_enter("{%u}", call->unmarshall);
440
441	switch (call->unmarshall) {
442	case 0:
443		call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
444		if (!call->buffer)
445			return -ENOMEM;
446		afs_extract_to_buf(call, 11 * sizeof(__be32));
447		call->unmarshall++;
448
449		fallthrough;
450	case 1:
451		_debug("extract UUID");
452		ret = afs_extract_data(call, false);
453		switch (ret) {
454		case 0:		break;
455		case -EAGAIN:	return 0;
456		default:	return ret;
457		}
458
459		_debug("unmarshall UUID");
460		call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
461		if (!call->request)
462			return -ENOMEM;
463
464		b = call->buffer;
465		r = call->request;
466		r->time_low			= b[0];
467		r->time_mid			= htons(ntohl(b[1]));
468		r->time_hi_and_version		= htons(ntohl(b[2]));
469		r->clock_seq_hi_and_reserved 	= ntohl(b[3]);
470		r->clock_seq_low		= ntohl(b[4]);
471
472		for (loop = 0; loop < 6; loop++)
473			r->node[loop] = ntohl(b[loop + 5]);
474
475		call->unmarshall++;
476		fallthrough;
477
478	case 2:
479		break;
480	}
481
482	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
483		return afs_io_error(call, afs_io_error_cm_reply);
484	return 0;
485}
486
487/*
488 * allow the fileserver to ask about the cache manager's capabilities
489 */
490static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
491{
492	struct afs_call *call = container_of(work, struct afs_call, work);
493	int loop;
494
495	struct {
496		struct /* InterfaceAddr */ {
497			__be32 nifs;
498			__be32 uuid[11];
499			__be32 ifaddr[32];
500			__be32 netmask[32];
501			__be32 mtu[32];
502		} ia;
503		struct /* Capabilities */ {
504			__be32 capcount;
505			__be32 caps[1];
506		} cap;
507	} reply;
508
509	_enter("");
510
511	memset(&reply, 0, sizeof(reply));
512
513	reply.ia.uuid[0] = call->net->uuid.time_low;
514	reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
515	reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
516	reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
517	reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
518	for (loop = 0; loop < 6; loop++)
519		reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
520
521	reply.cap.capcount = htonl(1);
522	reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
523	afs_send_simple_reply(call, &reply, sizeof(reply));
524	afs_put_call(call);
525	_leave("");
526}
527
528/*
529 * deliver request data to a CB.TellMeAboutYourself call
530 */
531static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
532{
533	int ret;
534
535	_enter("");
536
537	afs_extract_discard(call, 0);
538	ret = afs_extract_data(call, false);
539	if (ret < 0)
540		return ret;
541
542	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
543		return afs_io_error(call, afs_io_error_cm_reply);
544	return 0;
545}
546
547/*
548 * deliver request data to a YFS CB.CallBack call
549 */
550static int afs_deliver_yfs_cb_callback(struct afs_call *call)
551{
552	struct afs_callback_break *cb;
553	struct yfs_xdr_YFSFid *bp;
554	size_t size;
555	int ret, loop;
556
557	_enter("{%u}", call->unmarshall);
558
559	switch (call->unmarshall) {
560	case 0:
561		afs_extract_to_tmp(call);
562		call->unmarshall++;
563
564		/* extract the FID array and its count in two steps */
565		fallthrough;
566	case 1:
567		_debug("extract FID count");
568		ret = afs_extract_data(call, true);
569		if (ret < 0)
570			return ret;
571
572		call->count = ntohl(call->tmp);
573		_debug("FID count: %u", call->count);
574		if (call->count > YFSCBMAX)
575			return afs_protocol_error(call, afs_eproto_cb_fid_count);
576
577		size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
578		call->buffer = kmalloc(size, GFP_KERNEL);
579		if (!call->buffer)
580			return -ENOMEM;
581		afs_extract_to_buf(call, size);
582		call->unmarshall++;
583
584		fallthrough;
585	case 2:
586		_debug("extract FID array");
587		ret = afs_extract_data(call, false);
588		if (ret < 0)
589			return ret;
590
591		_debug("unmarshall FID array");
592		call->request = kcalloc(call->count,
593					sizeof(struct afs_callback_break),
594					GFP_KERNEL);
595		if (!call->request)
596			return -ENOMEM;
597
598		cb = call->request;
599		bp = call->buffer;
600		for (loop = call->count; loop > 0; loop--, cb++) {
601			cb->fid.vid	= xdr_to_u64(bp->volume);
602			cb->fid.vnode	= xdr_to_u64(bp->vnode.lo);
603			cb->fid.vnode_hi = ntohl(bp->vnode.hi);
604			cb->fid.unique	= ntohl(bp->vnode.unique);
605			bp++;
606		}
607
608		afs_extract_to_tmp(call);
609		call->unmarshall++;
610		fallthrough;
611
612	case 3:
613		break;
614	}
615
616	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
617		return afs_io_error(call, afs_io_error_cm_reply);
618	return 0;
619}