aboutsummaryrefslogtreecommitdiff
path: root/net/unix/sysctl_net_unix.c
blob: c09bea89151b241120ab58d88aaba94f3c8f87db (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * NET4:	Sysctl interface to net af_unix subsystem.
 *
 * Authors:	Mike Shaver.
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/sysctl.h>

#include <net/af_unix.h>

static struct ctl_table unix_table[] = {
	{
		.procname	= "max_dgram_qlen",
		.data		= &init_net.unx.sysctl_max_dgram_qlen,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{ }
};

int __net_init unix_sysctl_register(struct net *net)
{
	struct ctl_table *table;

	table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
	if (table == NULL)
		goto err_alloc;

	/* Don't export sysctls to unprivileged users */
	if (net->user_ns != &init_user_ns)
		table[0].procname = NULL;

	table[0].data = &net->unx.sysctl_max_dgram_qlen;
	net->unx.ctl = register_net_sysctl(net, "net/unix", table);
	if (net->unx.ctl == NULL)
		goto err_reg;

	return 0;

err_reg:
	kfree(table);
err_alloc:
	return -ENOMEM;
}

void unix_sysctl_unregister(struct net *net)
{
	struct ctl_table *table;

	table = net->unx.ctl->ctl_table_arg;
	unregister_net_sysctl_table(net->unx.ctl);
	kfree(table);
}