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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * NET4: Sysctl interface to net af_unix subsystem. | |
4 | * | |
5 | * Authors: Mike Shaver. | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/mm.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
1da177e4 LT |
10 | #include <linux/sysctl.h> |
11 | ||
20380731 | 12 | #include <net/af_unix.h> |
1da177e4 | 13 | |
fe2c6338 | 14 | static struct ctl_table unix_table[] = { |
1da177e4 | 15 | { |
1da177e4 | 16 | .procname = "max_dgram_qlen", |
a0a53c8b | 17 | .data = &init_net.unx.sysctl_max_dgram_qlen, |
1da177e4 LT |
18 | .maxlen = sizeof(int), |
19 | .mode = 0644, | |
6d9f239a | 20 | .proc_handler = proc_dointvec |
1da177e4 | 21 | }, |
f8572d8f | 22 | { } |
1da177e4 LT |
23 | }; |
24 | ||
2c8c1e72 | 25 | int __net_init unix_sysctl_register(struct net *net) |
1da177e4 | 26 | { |
1597fbc0 PE |
27 | struct ctl_table *table; |
28 | ||
29 | table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL); | |
30 | if (table == NULL) | |
31 | goto err_alloc; | |
32 | ||
464dc801 EB |
33 | /* Don't export sysctls to unprivileged users */ |
34 | if (net->user_ns != &init_user_ns) | |
35 | table[0].procname = NULL; | |
36 | ||
a0a53c8b | 37 | table[0].data = &net->unx.sysctl_max_dgram_qlen; |
ec8f23ce | 38 | net->unx.ctl = register_net_sysctl(net, "net/unix", table); |
a0a53c8b | 39 | if (net->unx.ctl == NULL) |
1597fbc0 PE |
40 | goto err_reg; |
41 | ||
42 | return 0; | |
43 | ||
44 | err_reg: | |
45 | kfree(table); | |
46 | err_alloc: | |
47 | return -ENOMEM; | |
1da177e4 LT |
48 | } |
49 | ||
97577e38 | 50 | void unix_sysctl_unregister(struct net *net) |
1da177e4 | 51 | { |
1597fbc0 PE |
52 | struct ctl_table *table; |
53 | ||
a0a53c8b | 54 | table = net->unx.ctl->ctl_table_arg; |
5dd3df10 | 55 | unregister_net_sysctl_table(net->unx.ctl); |
1597fbc0 | 56 | kfree(table); |
1da177e4 | 57 | } |