blob: 63ada437fc2f0196e42fb349ee552a54a25ecc7f [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>
15#include <linux/sysctl.h>
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110016#include <linux/nsproxy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Russell King496a22b2005-10-03 14:16:34 -070018#include <net/sock.h>
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#ifdef CONFIG_INET
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030021#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#endif
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#ifdef CONFIG_NET
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030025#include <linux/if_ether.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#endif
27
28#ifdef CONFIG_TR
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030029#include <linux/if_tr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#endif
31
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110032static struct list_head *
33net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
34{
35 return &namespaces->net_ns->sysctl_table_headers;
36}
37
Stephen Hemminger4ecb9002008-07-25 01:48:32 -070038/* Return standard mode bits for table entry. */
39static int net_ctl_permissions(struct ctl_table_root *root,
40 struct nsproxy *nsproxy,
41 struct ctl_table *table)
42{
43 /* Allow network administrator to have same access as root. */
44 if (capable(CAP_NET_ADMIN)) {
45 int mode = (table->mode >> 6) & 7;
46 return (mode << 6) | (mode << 3) | mode;
47 }
48 return table->mode;
49}
50
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110051static struct ctl_table_root net_sysctl_root = {
52 .lookup = net_ctl_header_lookup,
Stephen Hemminger4ecb9002008-07-25 01:48:32 -070053 .permissions = net_ctl_permissions,
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110054};
55
Pavel Emelyanovd62c6122008-05-19 13:45:33 -070056static LIST_HEAD(net_sysctl_ro_tables);
57static struct list_head *net_ctl_ro_header_lookup(struct ctl_table_root *root,
58 struct nsproxy *namespaces)
59{
60 return &net_sysctl_ro_tables;
61}
62
63static int net_ctl_ro_header_perms(struct ctl_table_root *root,
64 struct nsproxy *namespaces, struct ctl_table *table)
65{
66 if (namespaces->net_ns == &init_net)
67 return table->mode;
68 else
69 return table->mode & ~0222;
70}
71
72static struct ctl_table_root net_sysctl_ro_root = {
73 .lookup = net_ctl_ro_header_lookup,
74 .permissions = net_ctl_ro_header_perms,
75};
76
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110077static int sysctl_net_init(struct net *net)
78{
79 INIT_LIST_HEAD(&net->sysctl_table_headers);
80 return 0;
81}
82
83static void sysctl_net_exit(struct net *net)
84{
85 WARN_ON(!list_empty(&net->sysctl_table_headers));
86 return;
87}
88
89static struct pernet_operations sysctl_pernet_ops = {
90 .init = sysctl_net_init,
91 .exit = sysctl_net_exit,
92};
93
94static __init int sysctl_init(void)
95{
96 int ret;
97 ret = register_pernet_subsys(&sysctl_pernet_ops);
98 if (ret)
99 goto out;
100 register_sysctl_root(&net_sysctl_root);
Pavel Emelyanovd62c6122008-05-19 13:45:33 -0700101 register_sysctl_root(&net_sysctl_ro_root);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100102out:
103 return ret;
104}
105subsys_initcall(sysctl_init);
106
107struct ctl_table_header *register_net_sysctl_table(struct net *net,
108 const struct ctl_path *path, struct ctl_table *table)
109{
110 struct nsproxy namespaces;
111 namespaces = *current->nsproxy;
112 namespaces.net_ns = net;
113 return __register_sysctl_paths(&net_sysctl_root,
114 &namespaces, path, table);
115}
116EXPORT_SYMBOL_GPL(register_net_sysctl_table);
117
Pavel Emelyanovd62c6122008-05-19 13:45:33 -0700118struct ctl_table_header *register_net_sysctl_rotable(const
119 struct ctl_path *path, struct ctl_table *table)
120{
121 return __register_sysctl_paths(&net_sysctl_ro_root,
122 &init_nsproxy, path, table);
123}
124EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
125
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100126void unregister_net_sysctl_table(struct ctl_table_header *header)
127{
Harvey Harrisonab598592008-05-01 02:47:38 -0700128 unregister_sysctl_table(header);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100129}
130EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);