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
14 static 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
unix_sysctl_register(struct net * net)25 int __net_init unix_sysctl_register(struct net *net)
26 {
27 struct ctl_table *table;
28
29 if (net_eq(net, &init_net)) {
30 table = unix_table;
31 } else {
32 table = kmemdup(unix_table, 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(net, "net/unix", table);
40 if (net->unx.ctl == NULL)
41 goto err_reg;
42
43 return 0;
44
45 err_reg:
46 if (!net_eq(net, &init_net))
47 kfree(table);
48 err_alloc:
49 return -ENOMEM;
50 }
51
unix_sysctl_unregister(struct net * net)52 void unix_sysctl_unregister(struct net *net)
53 {
54 struct ctl_table *table;
55
56 table = net->unx.ctl->ctl_table_arg;
57 unregister_net_sysctl_table(net->unx.ctl);
58 if (!net_eq(net, &init_net))
59 kfree(table);
60 }
61