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>
30 #include <linux/if_tr.h>
33 static struct ctl_table_set *
34 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
36 return &namespaces->net_ns->sysctls;
39 static int is_seen(struct ctl_table_set *set)
41 return ¤t->nsproxy->net_ns->sysctls == set;
44 /* Return standard mode bits for table entry. */
45 static int net_ctl_permissions(struct ctl_table_root *root,
46 struct nsproxy *nsproxy,
47 struct ctl_table *table)
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;
57 static struct ctl_table_root net_sysctl_root = {
58 .lookup = net_ctl_header_lookup,
59 .permissions = net_ctl_permissions,
62 static int __net_init sysctl_net_init(struct net *net)
64 setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
68 static void __net_exit sysctl_net_exit(struct net *net)
70 retire_sysctl_set(&net->sysctls);
73 static struct pernet_operations sysctl_pernet_ops = {
74 .init = sysctl_net_init,
75 .exit = sysctl_net_exit,
78 static struct ctl_table_header *net_header;
79 __init int net_sysctl_init(void)
81 static struct ctl_table empty[1];
83 /* Avoid limitations in the sysctl implementation by
84 * registering "/proc/sys/net" as an empty directory not in a
87 net_header = register_sysctl("net", empty);
90 ret = register_pernet_subsys(&sysctl_pernet_ops);
93 register_sysctl_root(&net_sysctl_root);
98 struct ctl_table_header *register_net_sysctl(struct net *net,
99 const char *path, struct ctl_table *table)
101 return __register_sysctl_table(&net->sysctls, path, table);
103 EXPORT_SYMBOL_GPL(register_net_sysctl);
105 void unregister_net_sysctl_table(struct ctl_table_header *header)
107 unregister_sysctl_table(header);
109 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);