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 * $Log: sysctl_net.c,v $
8 * Revision 1.2 1996/05/08 20:24:40 shaver
9 * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
10 * NET_IPV4_IP_FORWARD.
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 list_head *
34 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
36 return &namespaces->net_ns->sysctl_table_headers;
39 static struct ctl_table_root net_sysctl_root = {
40 .lookup = net_ctl_header_lookup,
43 static LIST_HEAD(net_sysctl_ro_tables);
44 static struct list_head *net_ctl_ro_header_lookup(struct ctl_table_root *root,
45 struct nsproxy *namespaces)
47 return &net_sysctl_ro_tables;
50 static int net_ctl_ro_header_perms(struct ctl_table_root *root,
51 struct nsproxy *namespaces, struct ctl_table *table)
53 if (namespaces->net_ns == &init_net)
56 return table->mode & ~0222;
59 static struct ctl_table_root net_sysctl_ro_root = {
60 .lookup = net_ctl_ro_header_lookup,
61 .permissions = net_ctl_ro_header_perms,
64 static int sysctl_net_init(struct net *net)
66 INIT_LIST_HEAD(&net->sysctl_table_headers);
70 static void sysctl_net_exit(struct net *net)
72 WARN_ON(!list_empty(&net->sysctl_table_headers));
76 static struct pernet_operations sysctl_pernet_ops = {
77 .init = sysctl_net_init,
78 .exit = sysctl_net_exit,
81 static __init int sysctl_init(void)
84 ret = register_pernet_subsys(&sysctl_pernet_ops);
87 register_sysctl_root(&net_sysctl_root);
88 register_sysctl_root(&net_sysctl_ro_root);
92 subsys_initcall(sysctl_init);
94 struct ctl_table_header *register_net_sysctl_table(struct net *net,
95 const struct ctl_path *path, struct ctl_table *table)
97 struct nsproxy namespaces;
98 namespaces = *current->nsproxy;
99 namespaces.net_ns = net;
100 return __register_sysctl_paths(&net_sysctl_root,
101 &namespaces, path, table);
103 EXPORT_SYMBOL_GPL(register_net_sysctl_table);
105 struct ctl_table_header *register_net_sysctl_rotable(const
106 struct ctl_path *path, struct ctl_table *table)
108 return __register_sysctl_paths(&net_sysctl_ro_root,
109 &init_nsproxy, path, table);
111 EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
113 void unregister_net_sysctl_table(struct ctl_table_header *header)
115 unregister_sysctl_table(header);
117 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);