blob: e3a6e37cd1c536cc93d5caa850219e4104bb646b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- linux-c -*-
2 * sysctl_net.c: sysctl interface to net subsystem.
3 *
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net directories for each protocol family. [MS]
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Revision 1.2 1996/05/08 20:24:40 shaver
8 * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
9 * NET_IPV4_IP_FORWARD.
10 *
11 *
12 */
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/mm.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040015#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/sysctl.h>
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110017#include <linux/nsproxy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Russell King496a22b2005-10-03 14:16:34 -070019#include <net/sock.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#ifdef CONFIG_INET
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030022#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#endif
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#ifdef CONFIG_NET
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030026#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#endif
28
Al Viro73455092008-07-14 21:22:20 -040029static struct ctl_table_set *
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110030net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
31{
Al Viro73455092008-07-14 21:22:20 -040032 return &namespaces->net_ns->sysctls;
33}
34
35static int is_seen(struct ctl_table_set *set)
36{
37 return &current->nsproxy->net_ns->sysctls == set;
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110038}
39
Stephen Hemminger4ecb9002008-07-25 01:48:32 -070040/* Return standard mode bits for table entry. */
41static int net_ctl_permissions(struct ctl_table_root *root,
42 struct nsproxy *nsproxy,
43 struct ctl_table *table)
44{
45 /* Allow network administrator to have same access as root. */
46 if (capable(CAP_NET_ADMIN)) {
47 int mode = (table->mode >> 6) & 7;
48 return (mode << 6) | (mode << 3) | mode;
49 }
50 return table->mode;
51}
52
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110053static struct ctl_table_root net_sysctl_root = {
54 .lookup = net_ctl_header_lookup,
Stephen Hemminger4ecb9002008-07-25 01:48:32 -070055 .permissions = net_ctl_permissions,
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110056};
57
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +000058static int __net_init sysctl_net_init(struct net *net)
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110059{
Eric W. Biederman9eb47c22012-01-22 21:26:00 -080060 setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110061 return 0;
62}
63
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +000064static void __net_exit sysctl_net_exit(struct net *net)
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110065{
Eric W. Biederman97324cd82012-01-09 22:19:13 -080066 retire_sysctl_set(&net->sysctls);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110067}
68
69static struct pernet_operations sysctl_pernet_ops = {
70 .init = sysctl_net_init,
71 .exit = sysctl_net_exit,
72};
73
Eric W. Biedermanbc8a3692012-04-19 13:19:46 +000074static struct ctl_table_header *net_header;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +000075__init int net_sysctl_init(void)
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110076{
Eric W. Biedermanbc8a3692012-04-19 13:19:46 +000077 static struct ctl_table empty[1];
78 int ret = -ENOMEM;
79 /* Avoid limitations in the sysctl implementation by
80 * registering "/proc/sys/net" as an empty directory not in a
81 * network namespace.
82 */
83 net_header = register_sysctl("net", empty);
84 if (!net_header)
85 goto out;
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110086 ret = register_pernet_subsys(&sysctl_pernet_ops);
87 if (ret)
88 goto out;
Eric W. Biedermanbd295b52012-01-22 21:10:21 -080089 register_sysctl_root(&net_sysctl_root);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110090out:
91 return ret;
92}
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110093
Eric W. Biedermanab41a2c2012-04-19 13:18:47 +000094struct ctl_table_header *register_net_sysctl(struct net *net,
95 const char *path, struct ctl_table *table)
96{
97 return __register_sysctl_table(&net->sysctls, path, table);
98}
99EXPORT_SYMBOL_GPL(register_net_sysctl);
100
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100101void unregister_net_sysctl_table(struct ctl_table_header *header)
102{
Harvey Harrisonab598592008-05-01 02:47:38 -0700103 unregister_sysctl_table(header);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100104}
105EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);