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-rw-r--r--include/net/net_namespace.h3
-rw-r--r--net/sysctl_net.c30
2 files changed, 33 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index aa540e6be502..8df751b3be55 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -201,8 +201,11 @@ extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
struct ctl_path;
struct ctl_table;
struct ctl_table_header;
+
extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
const struct ctl_path *path, struct ctl_table *table);
+extern struct ctl_table_header *register_net_sysctl_rotable(
+ const struct ctl_path *path, struct ctl_table *table);
extern void unregister_net_sysctl_table(struct ctl_table_header *header);
#endif /* __NET_NET_NAMESPACE_H */
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index b4f0525f91af..d8e79162724c 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -40,6 +40,27 @@ static struct ctl_table_root net_sysctl_root = {
.lookup = net_ctl_header_lookup,
};
+static LIST_HEAD(net_sysctl_ro_tables);
+static struct list_head *net_ctl_ro_header_lookup(struct ctl_table_root *root,
+ struct nsproxy *namespaces)
+{
+ return &net_sysctl_ro_tables;
+}
+
+static int net_ctl_ro_header_perms(struct ctl_table_root *root,
+ struct nsproxy *namespaces, struct ctl_table *table)
+{
+ if (namespaces->net_ns == &init_net)
+ return table->mode;
+ else
+ return table->mode & ~0222;
+}
+
+static struct ctl_table_root net_sysctl_ro_root = {
+ .lookup = net_ctl_ro_header_lookup,
+ .permissions = net_ctl_ro_header_perms,
+};
+
static int sysctl_net_init(struct net *net)
{
INIT_LIST_HEAD(&net->sysctl_table_headers);
@@ -64,6 +85,7 @@ static __init int sysctl_init(void)
if (ret)
goto out;
register_sysctl_root(&net_sysctl_root);
+ register_sysctl_root(&net_sysctl_ro_root);
out:
return ret;
}
@@ -80,6 +102,14 @@ struct ctl_table_header *register_net_sysctl_table(struct net *net,
}
EXPORT_SYMBOL_GPL(register_net_sysctl_table);
+struct ctl_table_header *register_net_sysctl_rotable(const
+ struct ctl_path *path, struct ctl_table *table)
+{
+ return __register_sysctl_paths(&net_sysctl_ro_root,
+ &init_nsproxy, path, table);
+}
+EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
+
void unregister_net_sysctl_table(struct ctl_table_header *header)
{
unregister_sysctl_table(header);