[mirror_ubuntu-zesty-kernel.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;
}

/* 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 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
4ecb9009 SH	38	/* Return standard mode bits for table entry. */
	39	static int net_ctl_permissions(struct ctl_table_root *root,
	40	struct nsproxy *nsproxy,
	41	struct ctl_table *table)
	42	{
	43	/* Allow network administrator to have same access as root. */
	44	if (capable(CAP_NET_ADMIN)) {
	45	int mode = (table->mode >> 6) & 7;
	46	return (mode << 6) \| (mode << 3) \| mode;
	47	}
	48	return table->mode;
	49	}
	50
95bdfccb EB	51	static struct ctl_table_root net_sysctl_root = {
95bdfccb EB	52	.lookup = net_ctl_header_lookup,
4ecb9009	53	.permissions = net_ctl_permissions,
95bdfccb EB	54	};
95bdfccb EB	55
d62c612e PE	56	static LIST_HEAD(net_sysctl_ro_tables);
	57	static struct list_head net_ctl_ro_header_lookup(struct ctl_table_root root,
	58	struct nsproxy *namespaces)
	59	{
	60	return &net_sysctl_ro_tables;
	61	}
	62
	63	static int net_ctl_ro_header_perms(struct ctl_table_root *root,
	64	struct nsproxy namespaces, struct ctl_table table)
	65	{
	66	if (namespaces->net_ns == &init_net)
	67	return table->mode;
	68	else
	69	return table->mode & ~0222;
	70	}
	71
	72	static struct ctl_table_root net_sysctl_ro_root = {
	73	.lookup = net_ctl_ro_header_lookup,
	74	.permissions = net_ctl_ro_header_perms,
	75	};
	76
95bdfccb EB	77	static int sysctl_net_init(struct net *net)
	78	{
	79	INIT_LIST_HEAD(&net->sysctl_table_headers);
	80	return 0;
	81	}
	82
	83	static void sysctl_net_exit(struct net *net)
	84	{
	85	WARN_ON(!list_empty(&net->sysctl_table_headers));
	86	return;
	87	}
	88
	89	static struct pernet_operations sysctl_pernet_ops = {
	90	.init = sysctl_net_init,
	91	.exit = sysctl_net_exit,
	92	};
	93
	94	static __init int sysctl_init(void)
	95	{
	96	int ret;
	97	ret = register_pernet_subsys(&sysctl_pernet_ops);
	98	if (ret)
	99	goto out;
	100	register_sysctl_root(&net_sysctl_root);
d62c612e	101	register_sysctl_root(&net_sysctl_ro_root);
95bdfccb EB	102	out:
	103	return ret;
	104	}
	105	subsys_initcall(sysctl_init);
	106
	107	struct ctl_table_header register_net_sysctl_table(struct net net,
	108	const struct ctl_path path, struct ctl_table table)
	109	{
	110	struct nsproxy namespaces;
	111	namespaces = *current->nsproxy;
	112	namespaces.net_ns = net;
	113	return __register_sysctl_paths(&net_sysctl_root,
	114	&namespaces, path, table);
	115	}
	116	EXPORT_SYMBOL_GPL(register_net_sysctl_table);
	117
d62c612e PE	118	struct ctl_table_header *register_net_sysctl_rotable(const
	119	struct ctl_path path, struct ctl_table table)
	120	{
	121	return __register_sysctl_paths(&net_sysctl_ro_root,
	122	&init_nsproxy, path, table);
	123	}
	124	EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
	125
95bdfccb EB	126	void unregister_net_sysctl_table(struct ctl_table_header *header)
95bdfccb EB	127	{
ab59859d	128	unregister_sysctl_table(header);
95bdfccb EB	129	}
95bdfccb EB	130	EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);