summaryrefslogtreecommitdiffstats
path: root/net/qrtr/ns.c
blob: c5b3202a14cae757d39dba59e8fe42b16494aa13 (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
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (c) 2015, Sony Mobile Communications Inc.
 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
 * Copyright (c) 2020, Linaro Ltd.
 */

#include <linux/module.h>
#include <linux/qrtr.h>
#include <linux/workqueue.h>
#include <net/sock.h>

#include "qrtr.h"

static RADIX_TREE(nodes, GFP_KERNEL);

static struct {
	struct socket *sock;
	struct sockaddr_qrtr bcast_sq;
	struct list_head lookups;
	struct workqueue_struct *workqueue;
	struct work_struct work;
	int local_node;
} qrtr_ns;

static const char * const qrtr_ctrl_pkt_strings[] = {
	[QRTR_TYPE_HELLO]	= "hello",
	[QRTR_TYPE_BYE]		= "bye",
	[QRTR_TYPE_NEW_SERVER]	= "new-server",
	[QRTR_TYPE_DEL_SERVER]	= "del-server",
	[QRTR_TYPE_DEL_CLIENT]	= "del-client",
	[QRTR_TYPE_RESUME_TX]	= "resume-tx",
	[QRTR_TYPE_EXIT]	= "exit",
	[QRTR_TYPE_PING]	= "ping",
	[QRTR_TYPE_NEW_LOOKUP]	= "new-lookup",
	[QRTR_TYPE_DEL_LOOKUP]	= "del-lookup",
};

struct qrtr_server_filter {
	unsigned int service;
	unsigned int instance;
	unsigned int ifilter;
};

struct qrtr_lookup {
	unsigned int service;
	unsigned int instance;

	struct sockaddr_qrtr sq;
	struct list_head li;
};

struct qrtr_server {
	unsigned int service;
	unsigned int instance;

	unsigned int node;
	unsigned int port;

	struct list_head qli;
};

struct qrtr_node {
	unsigned int id;
	struct radix_tree_root servers;
};

static struct qrtr_node *node_get(unsigned int node_id)
{
	struct qrtr_node *node;

	node = radix_tree_lookup(&nodes, node_id);
	if (node)
		return node;

	/* If node didn't exist, allocate and insert it to the tree */
	node = kzalloc(sizeof(*node), GFP_KERNEL);
	if (!node)
		return NULL;

	node->id = node_id;

	radix_tree_insert(&nodes, node_id, node);

	return node;
}

static int server_match(const struct qrtr_server *srv,
			const struct qrtr_server_filter *f)
{
	unsigned int ifilter = f->ifilter;

	if (f->service != 0 && srv->service != f->service)
		return 0;
	if (!ifilter && f->instance)
		ifilter = ~0;

	return (srv->instance & ifilter) == f->instance;
}

static int service_announce_new(struct sockaddr_qrtr *dest,
				struct qrtr_server *srv)
{
	struct qrtr_ctrl_pkt pkt;
	struct msghdr msg = { };
	struct kvec iv;

	trace_printk("advertising new server [%d:%x]@[%d:%d]\n",
		     srv->service, srv->instance, srv->node, srv->port);

	iv.iov_base = &pkt;
	iv.iov_len = sizeof(pkt);

	memset(&pkt, 0, sizeof(pkt));
	pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER);
	pkt.server.service = cpu_to_le32(srv->service);
	pkt.server.instance = cpu_to_le32(srv->instance);
	pkt.server.node = cpu_to_le32(srv->node);
	pkt.server.port = cpu_to_le32(srv->port);

	msg.msg_name = (struct sockaddr *)dest;
	msg.msg_namelen = sizeof(*dest);

	return kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
}

static int service_announce_del(struct sockaddr_qrtr *dest,
				struct qrtr_server *srv)
{
	struct qrtr_ctrl_pkt pkt;
	struct msghdr msg = { };
	struct kvec iv;
	int ret;

	trace_printk("advertising removal of server [%d:%x]@[%d:%d]\n",
		     srv->service, srv->instance, srv->node, srv->port);

	iv.iov_base = &pkt;
	iv.iov_len = sizeof(pkt);

	memset(&pkt, 0, sizeof(pkt));
	pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_SERVER);
	pkt.server.service = cpu_to_le32(srv->service);
	pkt.server.instance = cpu_to_le32(srv->instance);
	pkt.server.node = cpu_to_le32(srv->node);
	pkt.server.port = cpu_to_le32(srv->port);

	msg.msg_name = (struct sockaddr *)dest;
	msg.msg_namelen = sizeof(*dest);

	ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
	if (ret < 0)
		pr_err("failed to announce del service\n");

	return ret;
}

static void lookup_notify(struct sockaddr_qrtr *to, struct qrtr_server *srv,
			  bool new)
{
	struct qrtr_ctrl_pkt pkt;
	struct msghdr msg = { };
	struct kvec iv;
	int ret;

	iv.iov_base = &pkt;
	iv.iov_len = sizeof(pkt);

	memset(&pkt, 0, sizeof(pkt));
	pkt.cmd = new ? cpu_to_le32(QRTR_TYPE_NEW_SERVER) :
			cpu_to_le32(QRTR_TYPE_DEL_SERVER);
	if (srv) {
		pkt.server.service = cpu_to_le32(srv->service);
		pkt.server.instance = cpu_to_le32(srv->instance);
		pkt.server.node = cpu_to_le32(srv->node);
		pkt.server.port = cpu_to_le32(srv->port);
	}

	msg.msg_name = (struct sockaddr *)to;
	msg.msg_namelen = sizeof(*to);

	ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
	if (ret < 0)
		pr_err("failed to send lookup notification\n");
}

static int announce_servers(struct sockaddr_qrtr *sq)
{
	struct radix_tree_iter iter;
	struct qrtr_server *srv;
	struct qrtr_node *node;
	void __rcu **slot;
	int ret;

	node = node_get(qrtr_ns.local_node);
	if (!node)
		return 0;

	/* Announce the list of servers registered in this node */
	radix_tree_for_each_slot(slot, &node->servers, &iter, 0) {
		srv = radix_tree_deref_slot(slot);

		ret = service_announce_new(sq, srv);
		if (ret < 0) {
			pr_err("failed to announce new service\n");
			return ret;
		}
	}

	return 0;
}

static struct qrtr_server *server_add(unsigned int service,
				      unsigned int instance,
				      unsigned int node_id,
				      unsigned int port)
{
	struct qrtr_server *srv;
	struct qrtr_server *old;
	struct qrtr_node *node;

	if (!service || !port)
		return NULL;

	srv = kzalloc(sizeof(*srv), GFP_KERNEL);
	if (!srv)
		return NULL;

	srv->service = service;
	srv->instance = instance;
	srv->node = node_id;
	srv->port = port;

	node = node_get(node_id);
	if (!node)
		goto err;

	/* Delete the old server on the same port */
	old = radix_tree_lookup(&node->servers, port);
	if (old) {
		radix_tree_delete(&node->servers, port);
		kfree(old);
	}

	radix_tree_insert(&node->servers, port, srv);

	trace_printk("add server [%d:%x]@[%d:%d]\n", srv->service,
		     srv->instance, srv->node, srv->port);

	return srv;

err:
	kfree(srv);
	return NULL;
}

static int server_del(struct qrtr_node *node, unsigned int port)
{
	struct qrtr_lookup *lookup;
	struct qrtr_server *srv;
	struct list_head *li;

	srv = radix_tree_lookup(&node->servers, port);
	if (!srv)
		return -ENOENT;

	radix_tree_delete(&node->servers, port);

	/* Broadcast the removal of local servers */
	if (srv->node == qrtr_ns.local_node)
		service_announce_del(&qrtr_ns.bcast_sq, srv);

	/* Announce the service's disappearance to observers */
	list_for_each(li, &qrtr_ns.lookups) {
		lookup = container_of(li, struct qrtr_lookup, li);
		if (lookup->service && lookup->service != srv->service)
			continue;
		if (lookup->instance && lookup->instance != srv->instance)
			continue;

		lookup_notify(&lookup->sq, srv, false);
	}

	kfree(srv);

	return 0;
}

static int say_hello(struct sockaddr_qrtr *dest)
{
	struct qrtr_ctrl_pkt pkt;
	struct msghdr msg = { };
	struct kvec iv;
	int ret;

	iv.iov_base = &pkt;
	iv.iov_len = sizeof(pkt);

	memset(&pkt, 0, sizeof(pkt));
	pkt.cmd = cpu_to_le32(QRTR_TYPE_HELLO);

	msg.msg_name = (struct sockaddr *)dest;
	msg.msg_namelen = sizeof(*dest);

	ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
	if (ret < 0)
		pr_err("failed to send hello msg\n");

	return ret;
}

/* Announce the list of servers registered on the local node */
static int ctrl_cmd_hello(struct sockaddr_qrtr *sq)
{
	int ret;

	ret = say_hello(sq);
	if (ret < 0)
		return ret;

	return announce_servers(sq);
}

static int ctrl_cmd_bye(struct sockaddr_qrtr *from)
{
	struct qrtr_node *local_node;
	struct radix_tree_iter iter;
	struct qrtr_ctrl_pkt pkt;
	struct qrtr_server *srv;
	struct sockaddr_qrtr sq;
	struct msghdr msg = { };
	struct qrtr_node *node;
	void __rcu **slot;
	struct kvec iv;
	int ret;

	iv.iov_base = &pkt;
	iv.iov_len = sizeof(pkt);

	node = node_get(from->sq_node);
	if (!node)
		return 0;

	/* Advertise removal of this client to all servers of remote node */
	radix_tree_for_each_slot(slot, &node->servers, &iter, 0) {
		srv = radix_tree_deref_slot(slot);
		server_del(node, srv->port);
	}

	/* Advertise the removal of this client to all local servers */
	local_node = node_get(qrtr_ns.local_node);
	if (!local_node)
		return 0;

	memset(&pkt, 0, sizeof(pkt));
	pkt.cmd = cpu_to_le32(QRTR_TYPE_BYE);
	pkt.client.node = cpu_to_le32(from->sq_node);

	radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) {
		srv = radix_tree_deref_slot(slot);

		sq.sq_family = AF_QIPCRTR;
		sq.sq_node = srv->node;
		sq.sq_port = srv->port;

		msg.msg_name = (struct sockaddr *)&sq;
		msg.msg_namelen = sizeof(sq);

		ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
		if (ret < 0) {
			pr_err("failed to send bye cmd\n");
			return ret;
		}
	}

	return 0;
}

static int ctrl_cmd_del_client(struct sockaddr_qrtr *from,
			       unsigned int node_id, unsigned int port)
{
	struct qrtr_node *local_node;
	struct radix_tree_iter iter;
	struct qrtr_lookup *lookup;
	struct qrtr_ctrl_pkt pkt;
	struct msghdr msg = { };
	struct qrtr_server *srv;
	struct sockaddr_qrtr sq;
	struct qrtr_node *node;
	struct list_head *tmp;
	struct list_head *li;
	void __rcu **slot;
	struct kvec iv;
	int ret;

	iv.iov_base = &pkt;
	iv.iov_len = sizeof(pkt);

	/* Don't accept spoofed messages */
	if (from->sq_node != node_id)
		return -EINVAL;

	/* Local DEL_CLIENT messages comes from the port being closed */
	if (from->sq_node == qrtr_ns.local_node && from->sq_port != port)
		return -EINVAL;

	/* Remove any lookups by this client */
	list_for_each_safe(li, tmp, &qrtr_ns.lookups) {
		lookup = container_of(li, struct qrtr_lookup, li);
		if (lookup->sq.sq_node != node_id)
			continue;
		if (lookup->sq.sq_port != port)
			continue;

		list_del(&lookup->li);
		kfree(lookup);
	}

	/* Remove the server belonging to this port */
	node = node_get(node_id);
	if (node)
		server_del(node, port);

	/* Advertise the removal of this client to all local servers */
	local_node = node_get(qrtr_ns.local_node);
	if (!local_node)
		return 0;

	memset(&pkt, 0, sizeof(pkt));
	pkt.cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
	pkt.client.node = cpu_to_le32(node_id);
	pkt.client.port = cpu_to_le32(port);

	radix_tree_for_each_slot(slot, &local_node->servers, &iter, 0) {
		srv = radix_tree_deref_slot(slot);

		sq.sq_family = AF_QIPCRTR;
		sq.sq_node = srv->node;
		sq.sq_port = srv->port;

		msg.msg_name = (struct sockaddr *)&sq;
		msg.msg_namelen = sizeof(sq);

		ret = kernel_sendmsg(qrtr_ns.sock, &msg, &iv, 1, sizeof(pkt));
		if (ret < 0) {
			pr_err("failed to send del client cmd\n");
			return ret;
		}
	}

	return 0;
}

static int ctrl_cmd_new_server(struct sockaddr_qrtr *from,
			       unsigned int service, unsigned int instance,
			       unsigned int node_id, unsigned int port)
{
	struct qrtr_lookup *lookup;
	struct qrtr_server *srv;
	struct list_head *li;
	int ret = 0;

	/* Ignore specified node and port for local servers */
	if (from->sq_node == qrtr_ns.local_node) {
		node_id = from->sq_node;
		port = from->sq_port;
	}

	/* Don't accept spoofed messages */
	if (from->sq_node != node_id)
		return -EINVAL;

	srv = server_add(service, instance, node_id, port);
	if (!srv)
		return -EINVAL;

	if (srv->node == qrtr_ns.local_node) {
		ret = service_announce_new(&qrtr_ns.bcast_sq, srv);
		if (ret < 0) {
			pr_err("failed to announce new service\n");
			return ret;
		}
	}

	/* Notify any potential lookups about the new server */
	list_for_each(li, &qrtr_ns.lookups) {
		lookup = container_of(li, struct qrtr_lookup, li);
		if (lookup->service && lookup->service != service)
			continue;
		if (lookup->instance && lookup->instance != instance)
			continue;

		lookup_notify(&lookup->sq, srv, true);
	}

	return ret;
}

static int ctrl_cmd_del_server(struct sockaddr_qrtr *from,
			       unsigned int service, unsigned int instance,
			       unsigned int node_id, unsigned int port)
{
	struct qrtr_node *node;

	/* Ignore specified node and port for local servers*/
	if (from->sq_node == qrtr_ns.local_node) {
		node_id = from->sq_node;
		port = from->sq_port;
	}

	/* Don't accept spoofed messages */
	if (from->sq_node != node_id)
		return -EINVAL;

	/* Local servers may only unregister themselves */
	if (from->sq_node == qrtr_ns.local_node && from->sq_port != port)
		return -EINVAL;

	node = node_get(node_id);
	if (!node)
		return -ENOENT;

	return server_del(node, port);
}

static int ctrl_cmd_new_lookup(struct sockaddr_qrtr *from,
			       unsigned int service, unsigned int instance)
{
	struct radix_tree_iter node_iter;
	struct qrtr_server_filter filter;
	struct radix_tree_iter srv_iter;
	struct qrtr_lookup *lookup;
	struct qrtr_node *node;
	void __rcu **node_slot;
	void __rcu **srv_slot;

	/* Accept only local observers */
	if (from->sq_node != qrtr_ns.local_node)
		return -EINVAL;

	lookup = kzalloc(sizeof(*lookup), GFP_KERNEL);
	if (!lookup)
		return -ENOMEM;

	lookup->sq = *from;
	lookup->service = service;
	lookup->instance = instance;
	list_add_tail(&lookup->li, &qrtr_ns.lookups);

	memset(&filter, 0, sizeof(filter));
	filter.service = service;
	filter.instance = instance;

	radix_tree_for_each_slot(node_slot, &nodes, &node_iter, 0) {
		node = radix_tree_deref_slot(node_slot);

		radix_tree_for_each_slot(srv_slot, &node->servers,
					 &srv_iter, 0) {
			struct qrtr_server *srv;

			srv = radix_tree_deref_slot(srv_slot);
			if (!server_match(srv, &filter))
				continue;

			lookup_notify(from, srv, true);
		}
	}

	/* Empty notification, to indicate end of listing */
	lookup_notify(from, NULL, true);

	return 0;
}

static void ctrl_cmd_del_lookup(struct sockaddr_qrtr *from,
				unsigned int service, unsigned int instance)
{
	struct qrtr_lookup *lookup;
	struct list_head *tmp;
	struct list_head *li;

	list_for_each_safe(li, tmp, &qrtr_ns.lookups) {
		lookup = container_of(li, struct qrtr_lookup, li);
		if (lookup->sq.sq_node != from->sq_node)
			continue;
		if (lookup->sq.sq_port != from->sq_port)
			continue;
		if (lookup->service != service)
			continue;
		if (lookup->instance && lookup->instance != instance)
			continue;

		list_del(&lookup->li);
		kfree(lookup);
	}
}

static void qrtr_ns_worker(struct work_struct *work)
{
	const struct qrtr_ctrl_pkt *pkt;
	size_t recv_buf_size = 4096;
	struct sockaddr_qrtr sq;
	struct msghdr msg = { };
	unsigned int cmd;
	ssize_t msglen;
	void *recv_buf;
	struct kvec iv;
	int ret;

	msg.msg_name = (struct sockaddr *)&sq;
	msg.msg_namelen = sizeof(sq);

	recv_buf = kzalloc(recv_buf_size, GFP_KERNEL);
	if (!recv_buf)
		return;

	for (;;) {
		iv.iov_base = recv_buf;
		iv.iov_len = recv_buf_size;

		msglen = kernel_recvmsg(qrtr_ns.sock, &msg, &iv, 1,
					iv.iov_len, MSG_DONTWAIT);

		if (msglen == -EAGAIN)
			break;

		if (msglen < 0) {
			pr_err("error receiving packet: %zd\n", msglen);
			break;
		}

		pkt = recv_buf;
		cmd = le32_to_cpu(pkt->cmd);
		if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) &&
		    qrtr_ctrl_pkt_strings[cmd])
			trace_printk("%s from %d:%d\n",
				     qrtr_ctrl_pkt_strings[cmd], sq.sq_node,
				     sq.sq_port);

		ret = 0;
		switch (cmd) {
		case QRTR_TYPE_HELLO:
			ret = ctrl_cmd_hello(&sq);
			break;
		case QRTR_TYPE_BYE:
			ret = ctrl_cmd_bye(&sq);
			break;
		case QRTR_TYPE_DEL_CLIENT:
			ret = ctrl_cmd_del_client(&sq,
					le32_to_cpu(pkt->client.node),
					le32_to_cpu(pkt->client.port));
			break;
		case QRTR_TYPE_NEW_SERVER:
			ret = ctrl_cmd_new_server(&sq,
					le32_to_cpu(pkt->server.service),
					le32_to_cpu(pkt->server.instance),
					le32_to_cpu(pkt->server.node),
					le32_to_cpu(pkt->server.port));
			break;
		case QRTR_TYPE_DEL_SERVER:
			ret = ctrl_cmd_del_server(&sq,
					 le32_to_cpu(pkt->server.service),
					 le32_to_cpu(pkt->server.instance),
					 le32_to_cpu(pkt->server.node),
					 le32_to_cpu(pkt->server.port));
			break;
		case QRTR_TYPE_EXIT:
		case QRTR_TYPE_PING:
		case QRTR_TYPE_RESUME_TX:
			break;
		case QRTR_TYPE_NEW_LOOKUP:
			ret = ctrl_cmd_new_lookup(&sq,
					 le32_to_cpu(pkt->server.service),
					 le32_to_cpu(pkt->server.instance));
			break;
		case QRTR_TYPE_DEL_LOOKUP:
			ctrl_cmd_del_lookup(&sq,
				    le32_to_cpu(pkt->server.service),
				    le32_to_cpu(pkt->server.instance));
			break;
		}

		if (ret < 0)
			pr_err("failed while handling packet from %d:%d",
			       sq.sq_node, sq.sq_port);
	}

	kfree(recv_buf);
}

static void qrtr_ns_data_ready(struct sock *sk)
{
	queue_work(qrtr_ns.workqueue, &qrtr_ns.work);
}

void qrtr_ns_init(void)
{
	struct sockaddr_qrtr sq;
	int ret;

	INIT_LIST_HEAD(&qrtr_ns.lookups);
	INIT_WORK(&qrtr_ns.work, qrtr_ns_worker);

	ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
			       PF_QIPCRTR, &qrtr_ns.sock);
	if (ret < 0)
		return;

	ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq);
	if (ret < 0) {
		pr_err("failed to get socket name\n");
		goto err_sock;
	}

	qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
	if (!qrtr_ns.workqueue)
		goto err_sock;

	qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;

	sq.sq_port = QRTR_PORT_CTRL;
	qrtr_ns.local_node = sq.sq_node;

	ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
	if (ret < 0) {
		pr_err("failed to bind to socket\n");
		goto err_wq;
	}

	qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
	qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
	qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;

	ret = say_hello(&qrtr_ns.bcast_sq);
	if (ret < 0)
		goto err_wq;

	return;

err_wq:
	destroy_workqueue(qrtr_ns.workqueue);
err_sock:
	sock_release(qrtr_ns.sock);
}
EXPORT_SYMBOL_GPL(qrtr_ns_init);

void qrtr_ns_remove(void)
{
	cancel_work_sync(&qrtr_ns.work);
	destroy_workqueue(qrtr_ns.workqueue);
	sock_release(qrtr_ns.sock);
}
EXPORT_SYMBOL_GPL(qrtr_ns_remove);

MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
MODULE_DESCRIPTION("Qualcomm IPC Router Nameservice");
MODULE_LICENSE("Dual BSD/GPL");