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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
29#ifdef CONFIG_TR
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030030#include <linux/if_tr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#endif
32
Al Viro73455092008-07-14 21:22:20 -040033static struct ctl_table_set *
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110034net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
35{
Al Viro73455092008-07-14 21:22:20 -040036 return &namespaces->net_ns->sysctls;
37}
38
39static int is_seen(struct ctl_table_set *set)
40{
41 return &current->nsproxy->net_ns->sysctls == set;
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110042}
43
Stephen Hemminger4ecb9002008-07-25 01:48:32 -070044/* Return standard mode bits for table entry. */
45static int net_ctl_permissions(struct ctl_table_root *root,
46 struct nsproxy *nsproxy,
47 struct ctl_table *table)
48{
49 /* Allow network administrator to have same access as root. */
50 if (capable(CAP_NET_ADMIN)) {
51 int mode = (table->mode >> 6) & 7;
52 return (mode << 6) | (mode << 3) | mode;
53 }
54 return table->mode;
55}
56
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110057static struct ctl_table_root net_sysctl_root = {
58 .lookup = net_ctl_header_lookup,
Stephen Hemminger4ecb9002008-07-25 01:48:32 -070059 .permissions = net_ctl_permissions,
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110060};
61
Pavel Emelyanovd62c6122008-05-19 13:45:33 -070062static int net_ctl_ro_header_perms(struct ctl_table_root *root,
63 struct nsproxy *namespaces, struct ctl_table *table)
64{
Cyrill Gorcunov81a1d3c2009-03-16 16:23:30 +010065 if (net_eq(namespaces->net_ns, &init_net))
Pavel Emelyanovd62c6122008-05-19 13:45:33 -070066 return table->mode;
67 else
68 return table->mode & ~0222;
69}
70
71static struct ctl_table_root net_sysctl_ro_root = {
Pavel Emelyanovd62c6122008-05-19 13:45:33 -070072 .permissions = net_ctl_ro_header_perms,
73};
74
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +000075static int __net_init sysctl_net_init(struct net *net)
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110076{
Al Viroeeb61f72008-07-27 08:59:33 +010077 setup_sysctl_set(&net->sysctls,
78 &net_sysctl_ro_root.default_set,
79 is_seen);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110080 return 0;
81}
82
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +000083static void __net_exit sysctl_net_exit(struct net *net)
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110084{
Al Viro73455092008-07-14 21:22:20 -040085 WARN_ON(!list_empty(&net->sysctls.list));
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110086}
87
88static struct pernet_operations sysctl_pernet_ops = {
89 .init = sysctl_net_init,
90 .exit = sysctl_net_exit,
91};
92
93static __init int sysctl_init(void)
94{
95 int ret;
96 ret = register_pernet_subsys(&sysctl_pernet_ops);
97 if (ret)
98 goto out;
99 register_sysctl_root(&net_sysctl_root);
Al Viro73455092008-07-14 21:22:20 -0400100 setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL);
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);