blob: 8800604c93f459e1db124aa2a9cafb1a7b5cdb8f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET4: Sysctl interface to net af_unix subsystem.
3 *
4 * Authors: Mike Shaver.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sysctl.h>
15
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030016#include <net/af_unix.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18static ctl_table unix_table[] = {
19 {
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 .procname = "max_dgram_qlen",
Denis V. Luneva0a53c82007-12-11 04:19:17 -080021 .data = &init_net.unx.sysctl_max_dgram_qlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 .maxlen = sizeof(int),
23 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -080024 .proc_handler = proc_dointvec
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 },
Eric W. Biedermanf8572d82009-11-05 13:32:03 -080026 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -070027};
28
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +000029int __net_init unix_sysctl_register(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110031 struct ctl_table *table;
32
33 table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
34 if (table == NULL)
35 goto err_alloc;
36
Eric W. Biederman464dc802012-11-16 03:02:59 +000037 /* Don't export sysctls to unprivileged users */
38 if (net->user_ns != &init_user_ns)
39 table[0].procname = NULL;
40
Denis V. Luneva0a53c82007-12-11 04:19:17 -080041 table[0].data = &net->unx.sysctl_max_dgram_qlen;
Eric W. Biedermanec8f23c2012-04-19 13:44:49 +000042 net->unx.ctl = register_net_sysctl(net, "net/unix", table);
Denis V. Luneva0a53c82007-12-11 04:19:17 -080043 if (net->unx.ctl == NULL)
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110044 goto err_reg;
45
46 return 0;
47
48err_reg:
49 kfree(table);
50err_alloc:
51 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
Pavel Emelyanov97577e32007-12-01 23:40:40 +110054void unix_sysctl_unregister(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110056 struct ctl_table *table;
57
Denis V. Luneva0a53c82007-12-11 04:19:17 -080058 table = net->unx.ctl->ctl_table_arg;
Eric W. Biederman5dd3df12012-04-19 13:24:33 +000059 unregister_net_sysctl_table(net->unx.ctl);
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110060 kfree(table);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061}