1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NET4: Sysctl interface to net af_unix subsystem.
4 *
5 * Authors: Mike Shaver.
6 */
7
8#include <linux/mm.h>
9#include <linux/slab.h>
10#include <linux/sysctl.h>
11
12#include <net/af_unix.h>
13
14static struct ctl_table unix_table[] = {
15 {
16 .procname = "max_dgram_qlen",
17 .data = &init_net.unx.sysctl_max_dgram_qlen,
18 .maxlen = sizeof(int),
19 .mode = 0644,
20 .proc_handler = proc_dointvec
21 },
22 { }
23};
24
25int __net_init unix_sysctl_register(struct net *net)
26{
27 struct ctl_table *table;
28
29 if (net_eq(net1: net, net2: &init_net)) {
30 table = unix_table;
31 } else {
32 table = kmemdup(p: unix_table, size: sizeof(unix_table), GFP_KERNEL);
33 if (!table)
34 goto err_alloc;
35
36 table[0].data = &net->unx.sysctl_max_dgram_qlen;
37 }
38
39 net->unx.ctl = register_net_sysctl_sz(net, path: "net/unix", table,
40 ARRAY_SIZE(unix_table));
41 if (net->unx.ctl == NULL)
42 goto err_reg;
43
44 return 0;
45
46err_reg:
47 if (!net_eq(net1: net, net2: &init_net))
48 kfree(objp: table);
49err_alloc:
50 return -ENOMEM;
51}
52
53void unix_sysctl_unregister(struct net *net)
54{
55 struct ctl_table *table;
56
57 table = net->unx.ctl->ctl_table_arg;
58 unregister_net_sysctl_table(header: net->unx.ctl);
59 if (!net_eq(net1: net, net2: &init_net))
60 kfree(objp: table);
61}
62

source code of linux/net/unix/sysctl_net_unix.c