[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/export.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 ctl_table_set *
net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
{
	return &namespaces->net_ns->sysctls;
}

static int is_seen(struct ctl_table_set *set)
{
	return &current->nsproxy->net_ns->sysctls == set;
}

/* Return standard mode bits for table entry. */
static int net_ctl_permissions(struct ctl_table_root *root,
			       struct nsproxy *nsproxy,
			       struct ctl_table *table)
{
	/* Allow network administrator to have same access as root. */
	if (capable(CAP_NET_ADMIN)) {
		int mode = (table->mode >> 6) & 7;
		return (mode << 6) | (mode << 3) | mode;
	}
	return table->mode;
}

static struct ctl_table_root net_sysctl_root = {
	.lookup = net_ctl_header_lookup,
	.permissions = net_ctl_permissions,
};

static int net_ctl_ro_header_perms(struct ctl_table_root *root,
		struct nsproxy *namespaces, struct ctl_table *table)
{
	if (net_eq(namespaces->net_ns, &init_net))
		return table->mode;
	else
		return table->mode & ~0222;
}

static struct ctl_table_root net_sysctl_ro_root = {
	.permissions = net_ctl_ro_header_perms,
};

static int __net_init sysctl_net_init(struct net *net)
{
	setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
	return 0;
}

static void __net_exit sysctl_net_exit(struct net *net)
{
	retire_sysctl_set(&net->sysctls);
}

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

static __init int net_sysctl_init(void)
{
	int ret;
	ret = register_pernet_subsys(&sysctl_pernet_ops);
	if (ret)
		goto out;
	setup_sysctl_set(&net_sysctl_ro_root.default_set, &net_sysctl_ro_root, NULL);
	register_sysctl_root(&net_sysctl_ro_root);
	register_sysctl_root(&net_sysctl_root);
out:
	return ret;
}
subsys_initcall(net_sysctl_init);

struct ctl_table_header *register_net_sysctl_table(struct net *net,
	const struct ctl_path *path, struct ctl_table *table)
{
	return __register_sysctl_paths(&net->sysctls, 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.default_set,
					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	14	#include <linux/mm.h>
bc3b2d7f	15	#include <linux/export.h>
1da177e4	16	#include <linux/sysctl.h>
95bdfccb	17	#include <linux/nsproxy.h>
1da177e4	18
496a22b0 RK	19	#include <net/sock.h>
496a22b0 RK	20
1da177e4	21	#ifdef CONFIG_INET
20380731	22	#include <net/ip.h>
1da177e4 LT	23	#endif
1da177e4 LT	24
1da177e4	25	#ifdef CONFIG_NET
20380731	26	#include <linux/if_ether.h>
1da177e4 LT	27	#endif
	28
	29	#ifdef CONFIG_TR
20380731	30	#include <linux/if_tr.h>
1da177e4 LT	31	#endif
1da177e4 LT	32
73455092	33	static struct ctl_table_set *
95bdfccb EB	34	net_ctl_header_lookup(struct ctl_table_root root, struct nsproxy namespaces)
95bdfccb EB	35	{
73455092 AV	36	return &namespaces->net_ns->sysctls;
	37	}
	38
	39	static int is_seen(struct ctl_table_set *set)
	40	{
	41	return &current->nsproxy->net_ns->sysctls == set;
95bdfccb EB	42	}
95bdfccb EB	43
4ecb9009 SH	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)
	48	{
	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;
	53	}
	54	return table->mode;
	55	}
	56
95bdfccb EB	57	static struct ctl_table_root net_sysctl_root = {
95bdfccb EB	58	.lookup = net_ctl_header_lookup,
4ecb9009	59	.permissions = net_ctl_permissions,
95bdfccb EB	60	};
95bdfccb EB	61
d62c612e PE	62	static int net_ctl_ro_header_perms(struct ctl_table_root *root,
	63	struct nsproxy namespaces, struct ctl_table table)
	64	{
81a1d3c3	65	if (net_eq(namespaces->net_ns, &init_net))
d62c612e PE	66	return table->mode;
	67	else
	68	return table->mode & ~0222;
	69	}
	70
	71	static struct ctl_table_root net_sysctl_ro_root = {
d62c612e PE	72	.permissions = net_ctl_ro_header_perms,
	73	};
	74
2c8c1e72	75	static int __net_init sysctl_net_init(struct net *net)
95bdfccb	76	{
9eb47c26	77	setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
95bdfccb EB	78	return 0;
	79	}
	80
2c8c1e72	81	static void __net_exit sysctl_net_exit(struct net *net)
95bdfccb	82	{
97324cd8	83	retire_sysctl_set(&net->sysctls);
95bdfccb EB	84	}
	85
	86	static struct pernet_operations sysctl_pernet_ops = {
	87	.init = sysctl_net_init,
	88	.exit = sysctl_net_exit,
	89	};
	90
de4e83bd	91	static __init int net_sysctl_init(void)
95bdfccb EB	92	{
	93	int ret;
	94	ret = register_pernet_subsys(&sysctl_pernet_ops);
	95	if (ret)
	96	goto out;
9eb47c26	97	setup_sysctl_set(&net_sysctl_ro_root.default_set, &net_sysctl_ro_root, NULL);
d62c612e	98	register_sysctl_root(&net_sysctl_ro_root);
bd295b56	99	register_sysctl_root(&net_sysctl_root);
95bdfccb EB	100	out:
	101	return ret;
	102	}
de4e83bd	103	subsys_initcall(net_sysctl_init);
95bdfccb EB	104
	105	struct ctl_table_header register_net_sysctl_table(struct net net,
	106	const struct ctl_path path, struct ctl_table table)
	107	{
60a47a2e	108	return __register_sysctl_paths(&net->sysctls, path, table);
95bdfccb EB	109	}
	110	EXPORT_SYMBOL_GPL(register_net_sysctl_table);
	111
d62c612e PE	112	struct ctl_table_header *register_net_sysctl_rotable(const
	113	struct ctl_path path, struct ctl_table table)
	114	{
60a47a2e EB	115	return __register_sysctl_paths(&net_sysctl_ro_root.default_set,
60a47a2e EB	116	path, table);
d62c612e PE	117	}
	118	EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
	119
95bdfccb EB	120	void unregister_net_sysctl_table(struct ctl_table_header *header)
95bdfccb EB	121	{
ab59859d	122	unregister_sysctl_table(header);
95bdfccb EB	123	}
95bdfccb EB	124	EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);