[linux-2.6-block.git] / net / core / sysctl_net_core.c

/* -*- linux-c -*-
 * sysctl_net_core.c: sysctl interface to net core subsystem.
 *
 * Begun April 1, 1996, Mike Shaver.
 * Added /proc/sys/net/core directory entry (empty =) ). [MS]
 */

#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/socket.h>
#include <linux/netdevice.h>
#include <linux/ratelimit.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kmemleak.h>

#include <net/ip.h>
#include <net/sock.h>
#include <net/net_ratelimit.h>

static int one = 1;

#ifdef CONFIG_RPS
static int rps_sock_flow_sysctl(ctl_table *table, int write,
				void __user *buffer, size_t *lenp, loff_t *ppos)
{
	unsigned int orig_size, size;
	int ret, i;
	ctl_table tmp = {
		.data = &size,
		.maxlen = sizeof(size),
		.mode = table->mode
	};
	struct rps_sock_flow_table *orig_sock_table, *sock_table;
	static DEFINE_MUTEX(sock_flow_mutex);

	mutex_lock(&sock_flow_mutex);

	orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
					lockdep_is_held(&sock_flow_mutex));
	size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;

	ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);

	if (write) {
		if (size) {
			if (size > 1<<30) {
				/* Enforce limit to prevent overflow */
				mutex_unlock(&sock_flow_mutex);
				return -EINVAL;
			}
			size = roundup_pow_of_two(size);
			if (size != orig_size) {
				sock_table =
				    vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
				if (!sock_table) {
					mutex_unlock(&sock_flow_mutex);
					return -ENOMEM;
				}

				sock_table->mask = size - 1;
			} else
				sock_table = orig_sock_table;

			for (i = 0; i < size; i++)
				sock_table->ents[i] = RPS_NO_CPU;
		} else
			sock_table = NULL;

		if (sock_table != orig_sock_table) {
			rcu_assign_pointer(rps_sock_flow_table, sock_table);
			if (sock_table)
				static_key_slow_inc(&rps_needed);
			if (orig_sock_table) {
				static_key_slow_dec(&rps_needed);
				synchronize_rcu();
				vfree(orig_sock_table);
			}
		}
	}

	mutex_unlock(&sock_flow_mutex);

	return ret;
}
#endif /* CONFIG_RPS */

#ifdef CONFIG_NET_FLOW_LIMIT
static DEFINE_MUTEX(flow_limit_update_mutex);

static int flow_limit_cpu_sysctl(ctl_table *table, int write,
				 void __user *buffer, size_t *lenp,
				 loff_t *ppos)
{
	struct sd_flow_limit *cur;
	struct softnet_data *sd;
	cpumask_var_t mask;
	int i, len, ret = 0;

	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return -ENOMEM;

	if (write) {
		ret = cpumask_parse_user(buffer, *lenp, mask);
		if (ret)
			goto done;

		mutex_lock(&flow_limit_update_mutex);
		len = sizeof(*cur) + netdev_flow_limit_table_len;
		for_each_possible_cpu(i) {
			sd = &per_cpu(softnet_data, i);
			cur = rcu_dereference_protected(sd->flow_limit,
				     lockdep_is_held(&flow_limit_update_mutex));
			if (cur && !cpumask_test_cpu(i, mask)) {
				RCU_INIT_POINTER(sd->flow_limit, NULL);
				synchronize_rcu();
				kfree(cur);
			} else if (!cur && cpumask_test_cpu(i, mask)) {
				cur = kzalloc(len, GFP_KERNEL);
				if (!cur) {
					/* not unwinding previous changes */
					ret = -ENOMEM;
					goto write_unlock;
				}
				cur->num_buckets = netdev_flow_limit_table_len;
				rcu_assign_pointer(sd->flow_limit, cur);
			}
		}
write_unlock:
		mutex_unlock(&flow_limit_update_mutex);
	} else {
		if (*ppos || !*lenp) {
			*lenp = 0;
			goto done;
		}

		cpumask_clear(mask);
		rcu_read_lock();
		for_each_possible_cpu(i) {
			sd = &per_cpu(softnet_data, i);
			if (rcu_dereference(sd->flow_limit))
				cpumask_set_cpu(i, mask);
		}
		rcu_read_unlock();

		len = cpumask_scnprintf(buffer, *lenp, mask);
		*lenp = len + 1;
		*ppos += len + 1;
	}

done:
	free_cpumask_var(mask);
	return ret;
}

static int flow_limit_table_len_sysctl(ctl_table *table, int write,
				       void __user *buffer, size_t *lenp,
				       loff_t *ppos)
{
	unsigned int old, *ptr;
	int ret;

	mutex_lock(&flow_limit_update_mutex);

	ptr = table->data;
	old = *ptr;
	ret = proc_dointvec(table, write, buffer, lenp, ppos);
	if (!ret && write && !is_power_of_2(*ptr)) {
		*ptr = old;
		ret = -EINVAL;
	}

	mutex_unlock(&flow_limit_update_mutex);
	return ret;
}
#endif /* CONFIG_NET_FLOW_LIMIT */

static struct ctl_table net_core_table[] = {
#ifdef CONFIG_NET
	{
		.procname	= "wmem_max",
		.data		= &sysctl_wmem_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
	},
	{
		.procname	= "rmem_max",
		.data		= &sysctl_rmem_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
	},
	{
		.procname	= "wmem_default",
		.data		= &sysctl_wmem_default,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
	},
	{
		.procname	= "rmem_default",
		.data		= &sysctl_rmem_default,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
	},
	{
		.procname	= "dev_weight",
		.data		= &weight_p,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{
		.procname	= "netdev_max_backlog",
		.data		= &netdev_max_backlog,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
#ifdef CONFIG_BPF_JIT
	{
		.procname	= "bpf_jit_enable",
		.data		= &bpf_jit_enable,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
#endif
	{
		.procname	= "netdev_tstamp_prequeue",
		.data		= &netdev_tstamp_prequeue,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{
		.procname	= "message_cost",
		.data		= &net_ratelimit_state.interval,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_jiffies,
	},
	{
		.procname	= "message_burst",
		.data		= &net_ratelimit_state.burst,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "optmem_max",
		.data		= &sysctl_optmem_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
#ifdef CONFIG_RPS
	{
		.procname	= "rps_sock_flow_entries",
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= rps_sock_flow_sysctl
	},
#endif
#ifdef CONFIG_NET_FLOW_LIMIT
	{
		.procname	= "flow_limit_cpu_bitmap",
		.mode		= 0644,
		.proc_handler	= flow_limit_cpu_sysctl
	},
	{
		.procname	= "flow_limit_table_len",
		.data		= &netdev_flow_limit_table_len,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= flow_limit_table_len_sysctl
	},
#endif /* CONFIG_NET_FLOW_LIMIT */
#endif /* CONFIG_NET */
	{
		.procname	= "netdev_budget",
		.data		= &netdev_budget,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{
		.procname	= "warnings",
		.data		= &net_msg_warn,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{ }
};

static struct ctl_table netns_core_table[] = {
	{
		.procname	= "somaxconn",
		.data		= &init_net.core.sysctl_somaxconn,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{ }
};

static __net_init int sysctl_core_net_init(struct net *net)
{
	struct ctl_table *tbl;

	net->core.sysctl_somaxconn = SOMAXCONN;

	tbl = netns_core_table;
	if (!net_eq(net, &init_net)) {
		tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
		if (tbl == NULL)
			goto err_dup;

		tbl[0].data = &net->core.sysctl_somaxconn;

		/* Don't export any sysctls to unprivileged users */
		if (net->user_ns != &init_user_ns) {
			tbl[0].procname = NULL;
		}
	}

	net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
	if (net->core.sysctl_hdr == NULL)
		goto err_reg;

	return 0;

err_reg:
	if (tbl != netns_core_table)
		kfree(tbl);
err_dup:
	return -ENOMEM;
}

static __net_exit void sysctl_core_net_exit(struct net *net)
{
	struct ctl_table *tbl;

	tbl = net->core.sysctl_hdr->ctl_table_arg;
	unregister_net_sysctl_table(net->core.sysctl_hdr);
	BUG_ON(tbl == netns_core_table);
	kfree(tbl);
}

static __net_initdata struct pernet_operations sysctl_core_ops = {
	.init = sysctl_core_net_init,
	.exit = sysctl_core_net_exit,
};

static __init int sysctl_core_init(void)
{
	register_net_sysctl(&init_net, "net/core", net_core_table);
	return register_pernet_subsys(&sysctl_core_ops);
}

fs_initcall(sysctl_core_init);
Commit	Line	Data
1da177e4 LT	1	/* -- linux-c --
	2	* sysctl_net_core.c: sysctl interface to net core subsystem.
	3	*
	4	* Begun April 1, 1996, Mike Shaver.
	5	* Added /proc/sys/net/core directory entry (empty =) ). [MS]
	6	*/
	7
	8	#include <linux/mm.h>
	9	#include <linux/sysctl.h>
1da177e4	10	#include <linux/module.h>
20380731	11	#include <linux/socket.h>
a37ae408	12	#include <linux/netdevice.h>
3fff4c42	13	#include <linux/ratelimit.h>
fec5e652	14	#include <linux/vmalloc.h>
33eb9cfc	15	#include <linux/init.h>
5a0e3ad6	16	#include <linux/slab.h>
7426a564	17	#include <linux/kmemleak.h>
3fff4c42	18
63d819ca	19	#include <net/ip.h>
20380731	20	#include <net/sock.h>
c5c177b4	21	#include <net/net_ratelimit.h>
1da177e4	22
cdda8891	23	static int one = 1;
cdda8891	24
fec5e652 TH	25	#ifdef CONFIG_RPS
	26	static int rps_sock_flow_sysctl(ctl_table *table, int write,
	27	void __user buffer, size_t lenp, loff_t *ppos)
	28	{
	29	unsigned int orig_size, size;
	30	int ret, i;
	31	ctl_table tmp = {
	32	.data = &size,
	33	.maxlen = sizeof(size),
	34	.mode = table->mode
	35	};
	36	struct rps_sock_flow_table orig_sock_table, sock_table;
	37	static DEFINE_MUTEX(sock_flow_mutex);
	38
	39	mutex_lock(&sock_flow_mutex);
	40
6e3f7faf ED	41	orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
6e3f7faf ED	42	lockdep_is_held(&sock_flow_mutex));
fec5e652 TH	43	size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
	44
	45	ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
	46
	47	if (write) {
	48	if (size) {
	49	if (size > 1<<30) {
	50	/* Enforce limit to prevent overflow */
	51	mutex_unlock(&sock_flow_mutex);
	52	return -EINVAL;
	53	}
	54	size = roundup_pow_of_two(size);
	55	if (size != orig_size) {
	56	sock_table =
	57	vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
	58	if (!sock_table) {
	59	mutex_unlock(&sock_flow_mutex);
	60	return -ENOMEM;
	61	}
	62
	63	sock_table->mask = size - 1;
	64	} else
	65	sock_table = orig_sock_table;
	66
	67	for (i = 0; i < size; i++)
	68	sock_table->ents[i] = RPS_NO_CPU;
	69	} else
	70	sock_table = NULL;
	71
	72	if (sock_table != orig_sock_table) {
	73	rcu_assign_pointer(rps_sock_flow_table, sock_table);
adc9300e	74	if (sock_table)
c5905afb	75	static_key_slow_inc(&rps_needed);
adc9300e	76	if (orig_sock_table) {
c5905afb	77	static_key_slow_dec(&rps_needed);
adc9300e ED	78	synchronize_rcu();
	79	vfree(orig_sock_table);
	80	}
fec5e652 TH	81	}
	82	}
	83
	84	mutex_unlock(&sock_flow_mutex);
	85
	86	return ret;
	87	}
	88	#endif /* CONFIG_RPS */
	89
99bbc707 WB	90	#ifdef CONFIG_NET_FLOW_LIMIT
	91	static DEFINE_MUTEX(flow_limit_update_mutex);
	92
	93	static int flow_limit_cpu_sysctl(ctl_table *table, int write,
	94	void __user buffer, size_t lenp,
	95	loff_t *ppos)
	96	{
	97	struct sd_flow_limit *cur;
	98	struct softnet_data *sd;
	99	cpumask_var_t mask;
	100	int i, len, ret = 0;
	101
	102	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	103	return -ENOMEM;
	104
	105	if (write) {
	106	ret = cpumask_parse_user(buffer, *lenp, mask);
	107	if (ret)
	108	goto done;
	109
	110	mutex_lock(&flow_limit_update_mutex);
	111	len = sizeof(*cur) + netdev_flow_limit_table_len;
	112	for_each_possible_cpu(i) {
	113	sd = &per_cpu(softnet_data, i);
	114	cur = rcu_dereference_protected(sd->flow_limit,
	115	lockdep_is_held(&flow_limit_update_mutex));
	116	if (cur && !cpumask_test_cpu(i, mask)) {
	117	RCU_INIT_POINTER(sd->flow_limit, NULL);
	118	synchronize_rcu();
	119	kfree(cur);
	120	} else if (!cur && cpumask_test_cpu(i, mask)) {
	121	cur = kzalloc(len, GFP_KERNEL);
	122	if (!cur) {
	123	/* not unwinding previous changes */
	124	ret = -ENOMEM;
	125	goto write_unlock;
	126	}
	127	cur->num_buckets = netdev_flow_limit_table_len;
	128	rcu_assign_pointer(sd->flow_limit, cur);
	129	}
	130	}
	131	write_unlock:
	132	mutex_unlock(&flow_limit_update_mutex);
	133	} else {
	134	if (ppos \|\| !lenp) {
	135	*lenp = 0;
	136	goto done;
	137	}
	138
	139	cpumask_clear(mask);
	140	rcu_read_lock();
	141	for_each_possible_cpu(i) {
	142	sd = &per_cpu(softnet_data, i);
	143	if (rcu_dereference(sd->flow_limit))
	144	cpumask_set_cpu(i, mask);
	145	}
	146	rcu_read_unlock();
	147
	148	len = cpumask_scnprintf(buffer, *lenp, mask);
	149	*lenp = len + 1;
	150	*ppos += len + 1;
	151	}
	152
	153	done:
154	free_cpumask_var(mask);
155	return ret;
156	}
157
158	static int flow_limit_table_len_sysctl(ctl_table *table, int write,
159	void __user buffer, size_t lenp,
160	loff_t *ppos)
161	{
162	unsigned int old, *ptr;
163	int ret;
164
165	mutex_lock(&flow_limit_update_mutex);
166
167	ptr = table->data;
168	old = *ptr;
169	ret = proc_dointvec(table, write, buffer, lenp, ppos);
170	if (!ret && write && !is_power_of_2(*ptr)) {
171	*ptr = old;
172	ret = -EINVAL;
173	}
174
175	mutex_unlock(&flow_limit_update_mutex);
176	return ret;
177	}
178	#endif /* CONFIG_NET_FLOW_LIMIT */
179
33eb9cfc	180	static struct ctl_table net_core_table[] = {
1da177e4 LT	181	#ifdef CONFIG_NET
1da177e4 LT	182	{
1da177e4 LT	183	.procname = "wmem_max",
	184	.data = &sysctl_wmem_max,
	185	.maxlen = sizeof(int),
	186	.mode = 0644,
cdda8891	187	.proc_handler = proc_dointvec_minmax,
cdda8891	188	.extra1 = &one,
1da177e4 LT	189	},
1da177e4 LT	190	{
1da177e4 LT	191	.procname = "rmem_max",
	192	.data = &sysctl_rmem_max,
	193	.maxlen = sizeof(int),
	194	.mode = 0644,
cdda8891	195	.proc_handler = proc_dointvec_minmax,
cdda8891	196	.extra1 = &one,
1da177e4 LT	197	},
1da177e4 LT	198	{
1da177e4 LT	199	.procname = "wmem_default",
	200	.data = &sysctl_wmem_default,
	201	.maxlen = sizeof(int),
	202	.mode = 0644,
cdda8891	203	.proc_handler = proc_dointvec_minmax,
cdda8891	204	.extra1 = &one,
1da177e4 LT	205	},
1da177e4 LT	206	{
1da177e4 LT	207	.procname = "rmem_default",
	208	.data = &sysctl_rmem_default,
	209	.maxlen = sizeof(int),
	210	.mode = 0644,
cdda8891	211	.proc_handler = proc_dointvec_minmax,
cdda8891	212	.extra1 = &one,
1da177e4 LT	213	},
1da177e4 LT	214	{
1da177e4 LT	215	.procname = "dev_weight",
	216	.data = &weight_p,
	217	.maxlen = sizeof(int),
	218	.mode = 0644,
6d9f239a	219	.proc_handler = proc_dointvec
1da177e4 LT	220	},
1da177e4 LT	221	{
1da177e4 LT	222	.procname = "netdev_max_backlog",
	223	.data = &netdev_max_backlog,
	224	.maxlen = sizeof(int),
	225	.mode = 0644,
6d9f239a	226	.proc_handler = proc_dointvec
1da177e4	227	},
0a14842f ED	228	#ifdef CONFIG_BPF_JIT
	229	{
	230	.procname = "bpf_jit_enable",
	231	.data = &bpf_jit_enable,
	232	.maxlen = sizeof(int),
	233	.mode = 0644,
	234	.proc_handler = proc_dointvec
	235	},
	236	#endif
3b098e2d ED	237	{
	238	.procname = "netdev_tstamp_prequeue",
	239	.data = &netdev_tstamp_prequeue,
	240	.maxlen = sizeof(int),
	241	.mode = 0644,
	242	.proc_handler = proc_dointvec
	243	},
1da177e4	244	{
1da177e4	245	.procname = "message_cost",
717115e1	246	.data = &net_ratelimit_state.interval,
1da177e4 LT	247	.maxlen = sizeof(int),
1da177e4 LT	248	.mode = 0644,
6d9f239a	249	.proc_handler = proc_dointvec_jiffies,
1da177e4 LT	250	},
1da177e4 LT	251	{
1da177e4	252	.procname = "message_burst",
717115e1	253	.data = &net_ratelimit_state.burst,
1da177e4 LT	254	.maxlen = sizeof(int),
1da177e4 LT	255	.mode = 0644,
6d9f239a	256	.proc_handler = proc_dointvec,
1da177e4 LT	257	},
1da177e4 LT	258	{
1da177e4 LT	259	.procname = "optmem_max",
	260	.data = &sysctl_optmem_max,
	261	.maxlen = sizeof(int),
	262	.mode = 0644,
6d9f239a	263	.proc_handler = proc_dointvec
1da177e4	264	},
fec5e652 TH	265	#ifdef CONFIG_RPS
	266	{
	267	.procname = "rps_sock_flow_entries",
	268	.maxlen = sizeof(int),
	269	.mode = 0644,
	270	.proc_handler = rps_sock_flow_sysctl
	271	},
	272	#endif
99bbc707 WB	273	#ifdef CONFIG_NET_FLOW_LIMIT
	274	{
	275	.procname = "flow_limit_cpu_bitmap",
	276	.mode = 0644,
	277	.proc_handler = flow_limit_cpu_sysctl
	278	},
	279	{
	280	.procname = "flow_limit_table_len",
	281	.data = &netdev_flow_limit_table_len,
	282	.maxlen = sizeof(int),
	283	.mode = 0644,
	284	.proc_handler = flow_limit_table_len_sysctl
	285	},
	286	#endif /* CONFIG_NET_FLOW_LIMIT */
1da177e4	287	#endif /* CONFIG_NET */
51b0bded	288	{
51b0bded SH	289	.procname = "netdev_budget",
	290	.data = &netdev_budget,
	291	.maxlen = sizeof(int),
	292	.mode = 0644,
6d9f239a	293	.proc_handler = proc_dointvec
51b0bded	294	},
a2a316fd	295	{
a2a316fd SH	296	.procname = "warnings",
	297	.data = &net_msg_warn,
	298	.maxlen = sizeof(int),
	299	.mode = 0644,
6d9f239a	300	.proc_handler = proc_dointvec
a2a316fd	301	},
f8572d8f	302	{ }
1da177e4	303	};
33eb9cfc	304
d5a4502e PE	305	static struct ctl_table netns_core_table[] = {
d5a4502e PE	306	{
d5a4502e PE	307	.procname = "somaxconn",
	308	.data = &init_net.core.sysctl_somaxconn,
	309	.maxlen = sizeof(int),
	310	.mode = 0644,
6d9f239a	311	.proc_handler = proc_dointvec
d5a4502e	312	},
f8572d8f	313	{ }
d5a4502e PE	314	};
d5a4502e PE	315
024626e3	316	static __net_init int sysctl_core_net_init(struct net *net)
33eb9cfc	317	{
d5a4502e	318	struct ctl_table *tbl;
024626e3	319
8efa6e93	320	net->core.sysctl_somaxconn = SOMAXCONN;
b8e1f9b5	321
d5a4502e	322	tbl = netns_core_table;
09ad9bc7	323	if (!net_eq(net, &init_net)) {
d5a4502e	324	tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
024626e3 PE	325	if (tbl == NULL)
	326	goto err_dup;
	327
d5a4502e	328	tbl[0].data = &net->core.sysctl_somaxconn;
464dc801 EB	329
	330	/* Don't export any sysctls to unprivileged users */
	331	if (net->user_ns != &init_user_ns) {
	332	tbl[0].procname = NULL;
	333	}
024626e3 PE	334	}
024626e3 PE	335
ec8f23ce	336	net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
8efa6e93	337	if (net->core.sysctl_hdr == NULL)
024626e3	338	goto err_reg;
33eb9cfc	339
024626e3 PE	340	return 0;
	341
	342	err_reg:
d5a4502e	343	if (tbl != netns_core_table)
024626e3 PE	344	kfree(tbl);
	345	err_dup:
	346	return -ENOMEM;
	347	}
	348
	349	static __net_exit void sysctl_core_net_exit(struct net *net)
	350	{
	351	struct ctl_table *tbl;
	352
8efa6e93 PE	353	tbl = net->core.sysctl_hdr->ctl_table_arg;
8efa6e93 PE	354	unregister_net_sysctl_table(net->core.sysctl_hdr);
d5a4502e	355	BUG_ON(tbl == netns_core_table);
024626e3 PE	356	kfree(tbl);
	357	}
	358
	359	static __net_initdata struct pernet_operations sysctl_core_ops = {
	360	.init = sysctl_core_net_init,
	361	.exit = sysctl_core_net_exit,
	362	};
	363
	364	static __init int sysctl_core_init(void)
	365	{
43444757	366	register_net_sysctl(&init_net, "net/core", net_core_table);
024626e3	367	return register_pernet_subsys(&sysctl_core_ops);
33eb9cfc PE	368	}
33eb9cfc PE	369
b27aeadb	370	fs_initcall(sysctl_core_init);