summaryrefslogtreecommitdiffstats
path: root/fs/smb/server/transport_ipc.c
blob: 2f27afb695f62e5f081356139fb9968a73648dc0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
 */

#include <linux/jhash.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/hashtable.h>
#include <net/net_namespace.h>
#include <net/genetlink.h>
#include <linux/socket.h>
#include <linux/workqueue.h>

#include "vfs_cache.h"
#include "transport_ipc.h"
#include "server.h"
#include "smb_common.h"

#include "mgmt/user_config.h"
#include "mgmt/share_config.h"
#include "mgmt/user_session.h"
#include "mgmt/tree_connect.h"
#include "mgmt/ksmbd_ida.h"
#include "connection.h"
#include "transport_tcp.h"
#include "transport_rdma.h"

#define IPC_WAIT_TIMEOUT	(2 * HZ)

#define IPC_MSG_HASH_BITS	3
static DEFINE_HASHTABLE(ipc_msg_table, IPC_MSG_HASH_BITS);
static DECLARE_RWSEM(ipc_msg_table_lock);
static DEFINE_MUTEX(startup_lock);

static DEFINE_IDA(ipc_ida);

static unsigned int ksmbd_tools_pid;

static bool ksmbd_ipc_validate_version(struct genl_info *m)
{
	if (m->genlhdr->version != KSMBD_GENL_VERSION) {
		pr_err("%s. ksmbd: %d, kernel module: %d. %s.\n",
		       "Daemon and kernel module version mismatch",
		       m->genlhdr->version,
		       KSMBD_GENL_VERSION,
		       "User-space ksmbd should terminate");
		return false;
	}
	return true;
}

struct ksmbd_ipc_msg {
	unsigned int		type;
	unsigned int		sz;
	unsigned char		payload[];
};

struct ipc_msg_table_entry {
	unsigned int		handle;
	unsigned int		type;
	wait_queue_head_t	wait;
	struct hlist_node	ipc_table_hlist;

	void			*response;
	unsigned int		msg_sz;
};

static struct delayed_work ipc_timer_work;

static int handle_startup_event(struct sk_buff *skb, struct genl_info *info);
static int handle_unsupported_event(struct sk_buff *skb, struct genl_info *info);
static int handle_generic_event(struct sk_buff *skb, struct genl_info *info);
static int ksmbd_ipc_heartbeat_request(void);

static const struct nla_policy ksmbd_nl_policy[KSMBD_EVENT_MAX + 1] = {
	[KSMBD_EVENT_UNSPEC] = {
		.len = 0,
	},
	[KSMBD_EVENT_HEARTBEAT_REQUEST] = {
		.len = sizeof(struct ksmbd_heartbeat),
	},
	[KSMBD_EVENT_STARTING_UP] = {
		.len = sizeof(struct ksmbd_startup_request),
	},
	[KSMBD_EVENT_SHUTTING_DOWN] = {
		.len = sizeof(struct ksmbd_shutdown_request),
	},
	[KSMBD_EVENT_LOGIN_REQUEST] = {
		.len = sizeof(struct ksmbd_login_request),
	},
	[KSMBD_EVENT_LOGIN_RESPONSE] = {
		.len = sizeof(struct ksmbd_login_response),
	},
	[KSMBD_EVENT_SHARE_CONFIG_REQUEST] = {
		.len = sizeof(struct ksmbd_share_config_request),
	},
	[KSMBD_EVENT_SHARE_CONFIG_RESPONSE] = {
		.len = sizeof(struct ksmbd_share_config_response),
	},
	[KSMBD_EVENT_TREE_CONNECT_REQUEST] = {
		.len = sizeof(struct ksmbd_tree_connect_request),
	},
	[KSMBD_EVENT_TREE_CONNECT_RESPONSE] = {
		.len = sizeof(struct ksmbd_tree_connect_response),
	},
	[KSMBD_EVENT_TREE_DISCONNECT_REQUEST] = {
		.len = sizeof(struct ksmbd_tree_disconnect_request),
	},
	[KSMBD_EVENT_LOGOUT_REQUEST] = {
		.len = sizeof(struct ksmbd_logout_request),
	},
	[KSMBD_EVENT_RPC_REQUEST] = {
	},
	[KSMBD_EVENT_RPC_RESPONSE] = {
	},
	[KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST] = {
	},
	[KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE] = {
	},
	[KSMBD_EVENT_LOGIN_REQUEST_EXT] = {
		.len = sizeof(struct ksmbd_login_request),
	},
	[KSMBD_EVENT_LOGIN_RESPONSE_EXT] = {
		.len = sizeof(struct ksmbd_login_response_ext),
	},
};

static struct genl_ops ksmbd_genl_ops[] = {
	{
		.cmd	= KSMBD_EVENT_UNSPEC,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_HEARTBEAT_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_STARTING_UP,
		.doit	= handle_startup_event,
	},
	{
		.cmd	= KSMBD_EVENT_SHUTTING_DOWN,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_LOGIN_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_LOGIN_RESPONSE,
		.doit	= handle_generic_event,
	},
	{
		.cmd	= KSMBD_EVENT_SHARE_CONFIG_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
		.doit	= handle_generic_event,
	},
	{
		.cmd	= KSMBD_EVENT_TREE_CONNECT_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_TREE_CONNECT_RESPONSE,
		.doit	= handle_generic_event,
	},
	{
		.cmd	= KSMBD_EVENT_TREE_DISCONNECT_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_LOGOUT_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_RPC_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_RPC_RESPONSE,
		.doit	= handle_generic_event,
	},
	{
		.cmd	= KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE,
		.doit	= handle_generic_event,
	},
	{
		.cmd	= KSMBD_EVENT_LOGIN_REQUEST_EXT,
		.doit	= handle_unsupported_event,
	},
	{
		.cmd	= KSMBD_EVENT_LOGIN_RESPONSE_EXT,
		.doit	= handle_generic_event,
	},
};

static struct genl_family ksmbd_genl_family = {
	.name		= KSMBD_GENL_NAME,
	.version	= KSMBD_GENL_VERSION,
	.hdrsize	= 0,
	.maxattr	= KSMBD_EVENT_MAX,
	.netnsok	= true,
	.module		= THIS_MODULE,
	.ops		= ksmbd_genl_ops,
	.n_ops		= ARRAY_SIZE(ksmbd_genl_ops),
	.resv_start_op	= KSMBD_EVENT_LOGIN_RESPONSE_EXT + 1,
};

static void ksmbd_nl_init_fixup(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ksmbd_genl_ops); i++)
		ksmbd_genl_ops[i].validate = GENL_DONT_VALIDATE_STRICT |
						GENL_DONT_VALIDATE_DUMP;

	ksmbd_genl_family.policy = ksmbd_nl_policy;
}

static int rpc_context_flags(struct ksmbd_session *sess)
{
	if (user_guest(sess->user))
		return KSMBD_RPC_RESTRICTED_CONTEXT;
	return 0;
}

static void ipc_update_last_active(void)
{
	if (server_conf.ipc_timeout)
		server_conf.ipc_last_active = jiffies;
}

static struct ksmbd_ipc_msg *ipc_msg_alloc(size_t sz)
{
	struct ksmbd_ipc_msg *msg;
	size_t msg_sz = sz + sizeof(struct ksmbd_ipc_msg);

	msg = kvzalloc(msg_sz, GFP_KERNEL);
	if (msg)
		msg->sz = sz;
	return msg;
}

static void ipc_msg_free(struct ksmbd_ipc_msg *msg)
{
	kvfree(msg);
}

static void ipc_msg_handle_free(int handle)
{
	if (handle >= 0)
		ksmbd_release_id(&ipc_ida, handle);
}

static int handle_response(int type, void *payload, size_t sz)
{
	unsigned int handle = *(unsigned int *)payload;
	struct ipc_msg_table_entry *entry;
	int ret = 0;

	ipc_update_last_active();
	down_read(&ipc_msg_table_lock);
	hash_for_each_possible(ipc_msg_table, entry, ipc_table_hlist, handle) {
		if (handle != entry->handle)
			continue;

		entry->response = NULL;
		/*
		 * Response message type value should be equal to
		 * request message type + 1.
		 */
		if (entry->type + 1 != type) {
			pr_err("Waiting for IPC type %d, got %d. Ignore.\n",
			       entry->type + 1, type);
		}

		entry->response = kvzalloc(sz, GFP_KERNEL);
		if (!entry->response) {
			ret = -ENOMEM;
			break;
		}

		memcpy(entry->response, payload, sz);
		entry->msg_sz = sz;
		wake_up_interruptible(&entry->wait);
		ret = 0;
		break;
	}
	up_read(&ipc_msg_table_lock);

	return ret;
}

static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
{
	int ret;

	ksmbd_set_fd_limit(req->file_max);
	server_conf.flags = req->flags;
	server_conf.signing = req->signing;
	server_conf.tcp_port = req->tcp_port;
	server_conf.ipc_timeout = req->ipc_timeout * HZ;
	server_conf.deadtime = req->deadtime * SMB_ECHO_INTERVAL;
	server_conf.share_fake_fscaps = req->share_fake_fscaps;
	ksmbd_init_domain(req->sub_auth);

	if (req->smb2_max_read)
		init_smb2_max_read_size(req->smb2_max_read);
	if (req->smb2_max_write)
		init_smb2_max_write_size(req->smb2_max_write);
	if (req->smb2_max_trans)
		init_smb2_max_trans_size(req->smb2_max_trans);
	if (req->smb2_max_credits)
		init_smb2_max_credits(req->smb2_max_credits);
	if (req->smbd_max_io_size)
		init_smbd_max_io_size(req->smbd_max_io_size);

	if (req->max_connections)
		server_conf.max_connections = req->max_connections;

	ret = ksmbd_set_netbios_name(req->netbios_name);
	ret |= ksmbd_set_server_string(req->server_string);
	ret |= ksmbd_set_work_group(req->work_group);
	ret |= ksmbd_tcp_set_interfaces(KSMBD_STARTUP_CONFIG_INTERFACES(req),
					req->ifc_list_sz);
	if (ret) {
		pr_err("Server configuration error: %s %s %s\n",
		       req->netbios_name, req->server_string,
		       req->work_group);
		return ret;
	}

	if (req->min_prot[0]) {
		ret = ksmbd_lookup_protocol_idx(req->min_prot);
		if (ret >= 0)
			server_conf.min_protocol = ret;
	}
	if (req->max_prot[0]) {
		ret = ksmbd_lookup_protocol_idx(req->max_prot);
		if (ret >= 0)
			server_conf.max_protocol = ret;
	}

	if (server_conf.ipc_timeout)
		schedule_delayed_work(&ipc_timer_work, server_conf.ipc_timeout);
	return 0;
}

static int handle_startup_event(struct sk_buff *skb, struct genl_info *info)
{
	int ret = 0;

#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;
#endif

	if (!ksmbd_ipc_validate_version(info))
		return -EINVAL;

	if (!info->attrs[KSMBD_EVENT_STARTING_UP])
		return -EINVAL;

	mutex_lock(&startup_lock);
	if (!ksmbd_server_configurable()) {
		mutex_unlock(&startup_lock);
		pr_err("Server reset is in progress, can't start daemon\n");
		return -EINVAL;
	}

	if (ksmbd_tools_pid) {
		if (ksmbd_ipc_heartbeat_request() == 0) {
			ret = -EINVAL;
			goto out;
		}

		pr_err("Reconnect to a new user space daemon\n");
	} else {
		struct ksmbd_startup_request *req;

		req = nla_data(info->attrs[info->genlhdr->cmd]);
		ret = ipc_server_config_on_startup(req);
		if (ret)
			goto out;
		server_queue_ctrl_init_work();
	}

	ksmbd_tools_pid = info->snd_portid;
	ipc_update_last_active();

out:
	mutex_unlock(&startup_lock);
	return ret;
}

static int handle_unsupported_event(struct sk_buff *skb, struct genl_info *info)
{
	pr_err("Unknown IPC event: %d, ignore.\n", info->genlhdr->cmd);
	return -EINVAL;
}

static int handle_generic_event(struct sk_buff *skb, struct genl_info *info)
{
	void *payload;
	int sz;
	int type = info->genlhdr->cmd;

#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;
#endif

	if (type > KSMBD_EVENT_MAX) {
		WARN_ON(1);
		return -EINVAL;
	}

	if (!ksmbd_ipc_validate_version(info))
		return -EINVAL;

	if (!info->attrs[type])
		return -EINVAL;

	payload = nla_data(info->attrs[info->genlhdr->cmd]);
	sz = nla_len(info->attrs[info->genlhdr->cmd]);
	return handle_response(type, payload, sz);
}

static int ipc_msg_send(struct ksmbd_ipc_msg *msg)
{
	struct genlmsghdr *nlh;
	struct sk_buff *skb;
	int ret = -EINVAL;

	if (!ksmbd_tools_pid)
		return ret;

	skb = genlmsg_new(msg->sz, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	nlh = genlmsg_put(skb, 0, 0, &ksmbd_genl_family, 0, msg->type);
	if (!nlh)
		goto out;

	ret = nla_put(skb, msg->type, msg->sz, msg->payload);
	if (ret) {
		genlmsg_cancel(skb, nlh);
		goto out;
	}

	genlmsg_end(skb, nlh);
	ret = genlmsg_unicast(&init_net, skb, ksmbd_tools_pid);
	if (!ret)
		ipc_update_last_active();
	return ret;

out:
	nlmsg_free(skb);
	return ret;
}

static int ipc_validate_msg(struct ipc_msg_table_entry *entry)
{
	unsigned int msg_sz = entry->msg_sz;

	switch (entry->type) {
	case KSMBD_EVENT_RPC_REQUEST:
	{
		struct ksmbd_rpc_command *resp = entry->response;

		msg_sz = sizeof(struct ksmbd_rpc_command) + resp->payload_sz;
		break;
	}
	case KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST:
	{
		struct ksmbd_spnego_authen_response *resp = entry->response;

		msg_sz = sizeof(struct ksmbd_spnego_authen_response) +
				resp->session_key_len + resp->spnego_blob_len;
		break;
	}
	case KSMBD_EVENT_SHARE_CONFIG_REQUEST:
	{
		struct ksmbd_share_config_response *resp = entry->response;

		if (resp->payload_sz) {
			if (resp->payload_sz < resp->veto_list_sz)
				return -EINVAL;

			msg_sz = sizeof(struct ksmbd_share_config_response) +
					resp->payload_sz;
		}
		break;
	}
	case KSMBD_EVENT_LOGIN_REQUEST_EXT:
	{
		struct ksmbd_login_response_ext *resp = entry->response;

		if (resp->ngroups) {
			msg_sz = sizeof(struct ksmbd_login_response_ext) +
					resp->ngroups * sizeof(gid_t);
		}
	}
	}

	return entry->msg_sz != msg_sz ? -EINVAL : 0;
}

static void *ipc_msg_send_request(struct ksmbd_ipc_msg *msg, unsigned int handle)
{
	struct ipc_msg_table_entry entry;
	int ret;

	if ((int)handle < 0)
		return NULL;

	entry.type = msg->type;
	entry.response = NULL;
	init_waitqueue_head(&entry.wait);

	down_write(&ipc_msg_table_lock);
	entry.handle = handle;
	hash_add(ipc_msg_table, &entry.ipc_table_hlist, entry.handle);
	up_write(&ipc_msg_table_lock);

	ret = ipc_msg_send(msg);
	if (ret)
		goto out;

	ret = wait_event_interruptible_timeout(entry.wait,
					       entry.response != NULL,
					       IPC_WAIT_TIMEOUT);
	if (entry.response) {
		ret = ipc_validate_msg(&entry);
		if (ret) {
			kvfree(entry.response);
			entry.response = NULL;
		}
	}
out:
	down_write(&ipc_msg_table_lock);
	hash_del(&entry.ipc_table_hlist);
	up_write(&ipc_msg_table_lock);
	return entry.response;
}

static int ksmbd_ipc_heartbeat_request(void)
{
	struct ksmbd_ipc_msg *msg;
	int ret;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_heartbeat));
	if (!msg)
		return -EINVAL;

	msg->type = KSMBD_EVENT_HEARTBEAT_REQUEST;
	ret = ipc_msg_send(msg);
	ipc_msg_free(msg);
	return ret;
}

struct ksmbd_login_response *ksmbd_ipc_login_request(const char *account)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_login_request *req;
	struct ksmbd_login_response *resp;

	if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
		return NULL;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_login_request));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_LOGIN_REQUEST;
	req = (struct ksmbd_login_request *)msg->payload;
	req->handle = ksmbd_acquire_id(&ipc_ida);
	strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_handle_free(req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_login_response_ext *ksmbd_ipc_login_request_ext(const char *account)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_login_request *req;
	struct ksmbd_login_response_ext *resp;

	if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
		return NULL;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_login_request));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_LOGIN_REQUEST_EXT;
	req = (struct ksmbd_login_request *)msg->payload;
	req->handle = ksmbd_acquire_id(&ipc_ida);
	strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_handle_free(req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_spnego_authen_response *
ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_spnego_authen_request *req;
	struct ksmbd_spnego_authen_response *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_spnego_authen_request) +
			blob_len + 1);
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST;
	req = (struct ksmbd_spnego_authen_request *)msg->payload;
	req->handle = ksmbd_acquire_id(&ipc_ida);
	req->spnego_blob_len = blob_len;
	memcpy(req->spnego_blob, spnego_blob, blob_len);

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_handle_free(req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_tree_connect_response *
ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess,
			       struct ksmbd_share_config *share,
			       struct ksmbd_tree_connect *tree_conn,
			       struct sockaddr *peer_addr)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_tree_connect_request *req;
	struct ksmbd_tree_connect_response *resp;

	if (strlen(user_name(sess->user)) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
		return NULL;

	if (strlen(share->name) >= KSMBD_REQ_MAX_SHARE_NAME)
		return NULL;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_connect_request));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_TREE_CONNECT_REQUEST;
	req = (struct ksmbd_tree_connect_request *)msg->payload;

	req->handle = ksmbd_acquire_id(&ipc_ida);
	req->account_flags = sess->user->flags;
	req->session_id = sess->id;
	req->connect_id = tree_conn->id;
	strscpy(req->account, user_name(sess->user), KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
	strscpy(req->share, share->name, KSMBD_REQ_MAX_SHARE_NAME);
	snprintf(req->peer_addr, sizeof(req->peer_addr), "%pIS", peer_addr);

	if (peer_addr->sa_family == AF_INET6)
		req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_IPV6;
	if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
		req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_SMB2;

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_handle_free(req->handle);
	ipc_msg_free(msg);
	return resp;
}

int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id,
				      unsigned long long connect_id)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_tree_disconnect_request *req;
	int ret;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_disconnect_request));
	if (!msg)
		return -ENOMEM;

	msg->type = KSMBD_EVENT_TREE_DISCONNECT_REQUEST;
	req = (struct ksmbd_tree_disconnect_request *)msg->payload;
	req->session_id = session_id;
	req->connect_id = connect_id;

	ret = ipc_msg_send(msg);
	ipc_msg_free(msg);
	return ret;
}

int ksmbd_ipc_logout_request(const char *account, int flags)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_logout_request *req;
	int ret;

	if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
		return -EINVAL;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_logout_request));
	if (!msg)
		return -ENOMEM;

	msg->type = KSMBD_EVENT_LOGOUT_REQUEST;
	req = (struct ksmbd_logout_request *)msg->payload;
	req->account_flags = flags;
	strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);

	ret = ipc_msg_send(msg);
	ipc_msg_free(msg);
	return ret;
}

struct ksmbd_share_config_response *
ksmbd_ipc_share_config_request(const char *name)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_share_config_request *req;
	struct ksmbd_share_config_response *resp;

	if (strlen(name) >= KSMBD_REQ_MAX_SHARE_NAME)
		return NULL;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_share_config_request));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_SHARE_CONFIG_REQUEST;
	req = (struct ksmbd_share_config_request *)msg->payload;
	req->handle = ksmbd_acquire_id(&ipc_ida);
	strscpy(req->share_name, name, KSMBD_REQ_MAX_SHARE_NAME);

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_handle_free(req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess, int handle)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_rpc_command *req;
	struct ksmbd_rpc_command *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_RPC_REQUEST;
	req = (struct ksmbd_rpc_command *)msg->payload;
	req->handle = handle;
	req->flags = ksmbd_session_rpc_method(sess, handle);
	req->flags |= KSMBD_RPC_OPEN_METHOD;
	req->payload_sz = 0;

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess, int handle)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_rpc_command *req;
	struct ksmbd_rpc_command *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_RPC_REQUEST;
	req = (struct ksmbd_rpc_command *)msg->payload;
	req->handle = handle;
	req->flags = ksmbd_session_rpc_method(sess, handle);
	req->flags |= KSMBD_RPC_CLOSE_METHOD;
	req->payload_sz = 0;

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess, int handle,
					  void *payload, size_t payload_sz)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_rpc_command *req;
	struct ksmbd_rpc_command *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_RPC_REQUEST;
	req = (struct ksmbd_rpc_command *)msg->payload;
	req->handle = handle;
	req->flags = ksmbd_session_rpc_method(sess, handle);
	req->flags |= rpc_context_flags(sess);
	req->flags |= KSMBD_RPC_WRITE_METHOD;
	req->payload_sz = payload_sz;
	memcpy(req->payload, payload, payload_sz);

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess, int handle)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_rpc_command *req;
	struct ksmbd_rpc_command *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_RPC_REQUEST;
	req = (struct ksmbd_rpc_command *)msg->payload;
	req->handle = handle;
	req->flags = ksmbd_session_rpc_method(sess, handle);
	req->flags |= rpc_context_flags(sess);
	req->flags |= KSMBD_RPC_READ_METHOD;
	req->payload_sz = 0;

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess, int handle,
					  void *payload, size_t payload_sz)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_rpc_command *req;
	struct ksmbd_rpc_command *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_RPC_REQUEST;
	req = (struct ksmbd_rpc_command *)msg->payload;
	req->handle = handle;
	req->flags = ksmbd_session_rpc_method(sess, handle);
	req->flags |= rpc_context_flags(sess);
	req->flags |= KSMBD_RPC_IOCTL_METHOD;
	req->payload_sz = payload_sz;
	memcpy(req->payload, payload, payload_sz);

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_free(msg);
	return resp;
}

struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess, void *payload,
					size_t payload_sz)
{
	struct ksmbd_ipc_msg *msg;
	struct ksmbd_rpc_command *req;
	struct ksmbd_rpc_command *resp;

	msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
	if (!msg)
		return NULL;

	msg->type = KSMBD_EVENT_RPC_REQUEST;
	req = (struct ksmbd_rpc_command *)msg->payload;
	req->handle = ksmbd_acquire_id(&ipc_ida);
	req->flags = rpc_context_flags(sess);
	req->flags |= KSMBD_RPC_RAP_METHOD;
	req->payload_sz = payload_sz;
	memcpy(req->payload, payload, payload_sz);

	resp = ipc_msg_send_request(msg, req->handle);
	ipc_msg_handle_free(req->handle);
	ipc_msg_free(msg);
	return resp;
}

static int __ipc_heartbeat(void)
{
	unsigned long delta;

	if (!ksmbd_server_running())
		return 0;

	if (time_after(jiffies, server_conf.ipc_last_active)) {
		delta = (jiffies - server_conf.ipc_last_active);
	} else {
		ipc_update_last_active();
		schedule_delayed_work(&ipc_timer_work,
				      server_conf.ipc_timeout);
		return 0;
	}

	if (delta < server_conf.ipc_timeout) {
		schedule_delayed_work(&ipc_timer_work,
				      server_conf.ipc_timeout - delta);
		return 0;
	}

	if (ksmbd_ipc_heartbeat_request() == 0) {
		schedule_delayed_work(&ipc_timer_work,
				      server_conf.ipc_timeout);
		return 0;
	}

	mutex_lock(&startup_lock);
	WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
	server_conf.ipc_last_active = 0;
	ksmbd_tools_pid = 0;
	pr_err("No IPC daemon response for %lus\n", delta / HZ);
	mutex_unlock(&startup_lock);
	return -EINVAL;
}

static void ipc_timer_heartbeat(struct work_struct *w)
{
	if (__ipc_heartbeat())
		server_queue_ctrl_reset_work();
}

int ksmbd_ipc_id_alloc(void)
{
	return ksmbd_acquire_id(&ipc_ida);
}

void ksmbd_rpc_id_free(int handle)
{
	ksmbd_release_id(&ipc_ida, handle);
}

void ksmbd_ipc_release(void)
{
	cancel_delayed_work_sync(&ipc_timer_work);
	genl_unregister_family(&ksmbd_genl_family);
}

void ksmbd_ipc_soft_reset(void)
{
	mutex_lock(&startup_lock);
	ksmbd_tools_pid = 0;
	cancel_delayed_work_sync(&ipc_timer_work);
	mutex_unlock(&startup_lock);
}

int ksmbd_ipc_init(void)
{
	int ret = 0;

	ksmbd_nl_init_fixup();
	INIT_DELAYED_WORK(&ipc_timer_work, ipc_timer_heartbeat);

	ret = genl_register_family(&ksmbd_genl_family);
	if (ret) {
		pr_err("Failed to register KSMBD netlink interface %d\n", ret);
		cancel_delayed_work_sync(&ipc_timer_work);
	}

	return ret;
}