2 * sysctl_net.c: sysctl interface to net subsystem.
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net directories for each protocol family. [MS]
7 * Revision 1.2 1996/05/08 20:24:40 shaver
8 * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
15 #include <linux/export.h>
16 #include <linux/sysctl.h>
17 #include <linux/nsproxy.h>
26 #include <linux/if_ether.h>
29 static struct ctl_table_set *
30 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
32 return &namespaces->net_ns->sysctls;
35 static int is_seen(struct ctl_table_set *set)
37 return ¤t->nsproxy->net_ns->sysctls == set;
40 /* Return standard mode bits for table entry. */
41 static int net_ctl_permissions(struct ctl_table_header *head,
42 struct ctl_table *table)
44 /* Allow network administrator to have same access as root. */
45 if (capable(CAP_NET_ADMIN)) {
46 int mode = (table->mode >> 6) & 7;
47 return (mode << 6) | (mode << 3) | mode;
52 static struct ctl_table_root net_sysctl_root = {
53 .lookup = net_ctl_header_lookup,
54 .permissions = net_ctl_permissions,
57 static int __net_init sysctl_net_init(struct net *net)
59 setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
63 static void __net_exit sysctl_net_exit(struct net *net)
65 retire_sysctl_set(&net->sysctls);
68 static struct pernet_operations sysctl_pernet_ops = {
69 .init = sysctl_net_init,
70 .exit = sysctl_net_exit,
73 static struct ctl_table_header *net_header;
74 __init int net_sysctl_init(void)
76 static struct ctl_table empty[1];
78 /* Avoid limitations in the sysctl implementation by
79 * registering "/proc/sys/net" as an empty directory not in a
82 net_header = register_sysctl("net", empty);
85 ret = register_pernet_subsys(&sysctl_pernet_ops);
88 register_sysctl_root(&net_sysctl_root);
93 struct ctl_table_header *register_net_sysctl(struct net *net,
94 const char *path, struct ctl_table *table)
96 return __register_sysctl_table(&net->sysctls, path, table);
98 EXPORT_SYMBOL_GPL(register_net_sysctl);
100 void unregister_net_sysctl_table(struct ctl_table_header *header)
102 unregister_sysctl_table(header);
104 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);