[linux-2.6-block.git] / net / sysctl_net.c

/* -*- linux-c -*-
 * sysctl_net.c: sysctl interface to net subsystem.
 *
 * Begun April 1, 1996, Mike Shaver.
 * Added /proc/sys/net directories for each protocol family. [MS]
 *
 * Revision 1.2  1996/05/08  20:24:40  shaver
 * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
 * NET_IPV4_IP_FORWARD.
 *
 *
 */

#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/nsproxy.h>

#include <net/sock.h>

#ifdef CONFIG_INET
#include <net/ip.h>
#endif

#ifdef CONFIG_NET
#include <linux/if_ether.h>
#endif

#ifdef CONFIG_TR
#include <linux/if_tr.h>
#endif

static struct list_head *
net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
{
	return &namespaces->net_ns->sysctl_table_headers;
}

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);
	return 0;
}

static void sysctl_net_exit(struct net *net)
{
	WARN_ON(!list_empty(&net->sysctl_table_headers));
	return;
}

static struct pernet_operations sysctl_pernet_ops = {
	.init = sysctl_net_init,
	.exit = sysctl_net_exit,
};

static __init int sysctl_init(void)
{
	int ret;
	ret = register_pernet_subsys(&sysctl_pernet_ops);
	if (ret)
		goto out;
	register_sysctl_root(&net_sysctl_root);
	register_sysctl_root(&net_sysctl_ro_root);
out:
	return ret;
}
subsys_initcall(sysctl_init);

struct ctl_table_header *register_net_sysctl_table(struct net *net,
	const struct ctl_path *path, struct ctl_table *table)
{
	struct nsproxy namespaces;
	namespaces = *current->nsproxy;
	namespaces.net_ns = net;
	return __register_sysctl_paths(&net_sysctl_root,
					&namespaces, path, table);
}
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);
}
EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
Commit	Line	Data
1da177e4 LT	1	/* -- 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	*
1da177e4 LT	7	* 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
1da177e4 LT	14	#include <linux/mm.h>
1da177e4 LT	15	#include <linux/sysctl.h>
95bdfccb	16	#include <linux/nsproxy.h>
1da177e4	17
496a22b0 RK	18	#include <net/sock.h>
496a22b0 RK	19
1da177e4	20	#ifdef CONFIG_INET
20380731	21	#include <net/ip.h>
1da177e4 LT	22	#endif
1da177e4 LT	23
1da177e4	24	#ifdef CONFIG_NET
20380731	25	#include <linux/if_ether.h>
1da177e4 LT	26	#endif
	27
	28	#ifdef CONFIG_TR
20380731	29	#include <linux/if_tr.h>
1da177e4 LT	30	#endif
1da177e4 LT	31
95bdfccb EB	32	static struct list_head *
	33	net_ctl_header_lookup(struct ctl_table_root root, struct nsproxy namespaces)
	34	{
	35	return &namespaces->net_ns->sysctl_table_headers;
	36	}
	37
	38	static struct ctl_table_root net_sysctl_root = {
	39	.lookup = net_ctl_header_lookup,
	40	};
	41
d62c612e PE	42	static LIST_HEAD(net_sysctl_ro_tables);
	43	static struct list_head net_ctl_ro_header_lookup(struct ctl_table_root root,
	44	struct nsproxy *namespaces)
	45	{
	46	return &net_sysctl_ro_tables;
	47	}
	48
	49	static int net_ctl_ro_header_perms(struct ctl_table_root *root,
	50	struct nsproxy namespaces, struct ctl_table table)
	51	{
	52	if (namespaces->net_ns == &init_net)
	53	return table->mode;
	54	else
	55	return table->mode & ~0222;
	56	}
	57
	58	static struct ctl_table_root net_sysctl_ro_root = {
	59	.lookup = net_ctl_ro_header_lookup,
	60	.permissions = net_ctl_ro_header_perms,
	61	};
	62
95bdfccb EB	63	static int sysctl_net_init(struct net *net)
	64	{
	65	INIT_LIST_HEAD(&net->sysctl_table_headers);
	66	return 0;
	67	}
	68
	69	static void sysctl_net_exit(struct net *net)
	70	{
	71	WARN_ON(!list_empty(&net->sysctl_table_headers));
	72	return;
	73	}
	74
	75	static struct pernet_operations sysctl_pernet_ops = {
	76	.init = sysctl_net_init,
	77	.exit = sysctl_net_exit,
	78	};
	79
	80	static __init int sysctl_init(void)
	81	{
	82	int ret;
	83	ret = register_pernet_subsys(&sysctl_pernet_ops);
	84	if (ret)
	85	goto out;
	86	register_sysctl_root(&net_sysctl_root);
d62c612e	87	register_sysctl_root(&net_sysctl_ro_root);
95bdfccb EB	88	out:
	89	return ret;
	90	}
	91	subsys_initcall(sysctl_init);
	92
	93	struct ctl_table_header register_net_sysctl_table(struct net net,
	94	const struct ctl_path path, struct ctl_table table)
	95	{
	96	struct nsproxy namespaces;
	97	namespaces = *current->nsproxy;
	98	namespaces.net_ns = net;
	99	return __register_sysctl_paths(&net_sysctl_root,
	100	&namespaces, path, table);
	101	}
	102	EXPORT_SYMBOL_GPL(register_net_sysctl_table);
	103
d62c612e PE	104	struct ctl_table_header *register_net_sysctl_rotable(const
	105	struct ctl_path path, struct ctl_table table)
	106	{
	107	return __register_sysctl_paths(&net_sysctl_ro_root,
	108	&init_nsproxy, path, table);
	109	}
	110	EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
	111
95bdfccb EB	112	void unregister_net_sysctl_table(struct ctl_table_header *header)
95bdfccb EB	113	{
ab59859d	114	unregister_sysctl_table(header);
95bdfccb EB	115	}
95bdfccb EB	116	EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);