[linux-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>
#include <net/busy_poll.h>

static int one = 1;

#ifdef CONFIG_RPS
static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
				void __user *buffer, size_t *lenp, loff_t *ppos)
{
	unsigned int orig_size, size;
	int ret, i;
	struct 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(struct 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 {
		char kbuf[128];

		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 = min(sizeof(kbuf) - 1, *lenp);
		len = cpumask_scnprintf(kbuf, len, mask);
		if (!len) {
			*lenp = 0;
			goto done;
		}
		if (len < *lenp)
			kbuf[len++] = '\n';
		if (copy_to_user(buffer, kbuf, len)) {
			ret = -EFAULT;
			goto done;
		}
		*lenp = len;
		*ppos += len;
	}

done:
	free_cpumask_var(mask);
	return ret;
}

static int flow_limit_table_len_sysctl(struct 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 */
#ifdef CONFIG_NET_LL_RX_POLL
	{
		.procname	= "busy_poll",
		.data		= &sysctl_net_busy_poll,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{
		.procname	= "busy_read",
		.data		= &sysctl_net_busy_read,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
#
#endif
#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>
076bb0c8	22	#include <net/busy_poll.h>
1da177e4	23
cdda8891	24	static int one = 1;
cdda8891	25
fec5e652	26	#ifdef CONFIG_RPS
fe2c6338	27	static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
fec5e652 TH	28	void __user buffer, size_t lenp, loff_t *ppos)
	29	{
	30	unsigned int orig_size, size;
	31	int ret, i;
fe2c6338	32	struct ctl_table tmp = {
fec5e652 TH	33	.data = &size,
	34	.maxlen = sizeof(size),
	35	.mode = table->mode
	36	};
	37	struct rps_sock_flow_table orig_sock_table, sock_table;
	38	static DEFINE_MUTEX(sock_flow_mutex);
	39
	40	mutex_lock(&sock_flow_mutex);
	41
6e3f7faf ED	42	orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
6e3f7faf ED	43	lockdep_is_held(&sock_flow_mutex));
fec5e652 TH	44	size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
	45
	46	ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
	47
	48	if (write) {
	49	if (size) {
	50	if (size > 1<<30) {
	51	/* Enforce limit to prevent overflow */
	52	mutex_unlock(&sock_flow_mutex);
	53	return -EINVAL;
	54	}
	55	size = roundup_pow_of_two(size);
	56	if (size != orig_size) {
	57	sock_table =
	58	vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
	59	if (!sock_table) {
	60	mutex_unlock(&sock_flow_mutex);
	61	return -ENOMEM;
	62	}
	63
	64	sock_table->mask = size - 1;
	65	} else
	66	sock_table = orig_sock_table;
	67
	68	for (i = 0; i < size; i++)
	69	sock_table->ents[i] = RPS_NO_CPU;
	70	} else
	71	sock_table = NULL;
	72
	73	if (sock_table != orig_sock_table) {
	74	rcu_assign_pointer(rps_sock_flow_table, sock_table);
adc9300e	75	if (sock_table)
c5905afb	76	static_key_slow_inc(&rps_needed);
adc9300e	77	if (orig_sock_table) {
c5905afb	78	static_key_slow_dec(&rps_needed);
adc9300e ED	79	synchronize_rcu();
	80	vfree(orig_sock_table);
	81	}
fec5e652 TH	82	}
	83	}
	84
	85	mutex_unlock(&sock_flow_mutex);
	86
	87	return ret;
	88	}
	89	#endif /* CONFIG_RPS */
	90
99bbc707 WB	91	#ifdef CONFIG_NET_FLOW_LIMIT
	92	static DEFINE_MUTEX(flow_limit_update_mutex);
	93
fe2c6338	94	static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
99bbc707 WB	95	void __user buffer, size_t lenp,
	96	loff_t *ppos)
	97	{
	98	struct sd_flow_limit *cur;
	99	struct softnet_data *sd;
	100	cpumask_var_t mask;
	101	int i, len, ret = 0;
	102
	103	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	104	return -ENOMEM;
	105
	106	if (write) {
	107	ret = cpumask_parse_user(buffer, *lenp, mask);
	108	if (ret)
	109	goto done;
	110
	111	mutex_lock(&flow_limit_update_mutex);
	112	len = sizeof(*cur) + netdev_flow_limit_table_len;
	113	for_each_possible_cpu(i) {
	114	sd = &per_cpu(softnet_data, i);
	115	cur = rcu_dereference_protected(sd->flow_limit,
	116	lockdep_is_held(&flow_limit_update_mutex));
	117	if (cur && !cpumask_test_cpu(i, mask)) {
	118	RCU_INIT_POINTER(sd->flow_limit, NULL);
	119	synchronize_rcu();
	120	kfree(cur);
	121	} else if (!cur && cpumask_test_cpu(i, mask)) {
	122	cur = kzalloc(len, GFP_KERNEL);
	123	if (!cur) {
	124	/* not unwinding previous changes */
	125	ret = -ENOMEM;
	126	goto write_unlock;
	127	}
	128	cur->num_buckets = netdev_flow_limit_table_len;
	129	rcu_assign_pointer(sd->flow_limit, cur);
	130	}
	131	}
	132	write_unlock:
	133	mutex_unlock(&flow_limit_update_mutex);
	134	} else {
5f121b9a WB	135	char kbuf[128];
5f121b9a WB	136
99bbc707 WB	137	if (ppos \|\| !lenp) {
	138	*lenp = 0;
	139	goto done;
	140	}
	141
	142	cpumask_clear(mask);
	143	rcu_read_lock();
	144	for_each_possible_cpu(i) {
	145	sd = &per_cpu(softnet_data, i);
	146	if (rcu_dereference(sd->flow_limit))
	147	cpumask_set_cpu(i, mask);
	148	}
	149	rcu_read_unlock();
	150
5f121b9a WB	151	len = min(sizeof(kbuf) - 1, *lenp);
	152	len = cpumask_scnprintf(kbuf, len, mask);
	153	if (!len) {
	154	*lenp = 0;
	155	goto done;
	156	}
	157	if (len < *lenp)
	158	kbuf[len++] = '\n';
	159	if (copy_to_user(buffer, kbuf, len)) {
	160	ret = -EFAULT;
	161	goto done;
	162	}
	163	*lenp = len;
	164	*ppos += len;
99bbc707 WB	165	}
	166
	167	done:
	168	free_cpumask_var(mask);
	169	return ret;
	170	}
	171
fe2c6338	172	static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
99bbc707 WB	173	void __user buffer, size_t lenp,
	174	loff_t *ppos)
	175	{
	176	unsigned int old, *ptr;
	177	int ret;
	178
	179	mutex_lock(&flow_limit_update_mutex);
	180
	181	ptr = table->data;
	182	old = *ptr;
	183	ret = proc_dointvec(table, write, buffer, lenp, ppos);
	184	if (!ret && write && !is_power_of_2(*ptr)) {
	185	*ptr = old;
	186	ret = -EINVAL;
	187	}
	188
	189	mutex_unlock(&flow_limit_update_mutex);
	190	return ret;
	191	}
	192	#endif /* CONFIG_NET_FLOW_LIMIT */
	193
33eb9cfc	194	static struct ctl_table net_core_table[] = {
1da177e4 LT	195	#ifdef CONFIG_NET
1da177e4 LT	196	{
1da177e4 LT	197	.procname = "wmem_max",
	198	.data = &sysctl_wmem_max,
	199	.maxlen = sizeof(int),
	200	.mode = 0644,
cdda8891	201	.proc_handler = proc_dointvec_minmax,
cdda8891	202	.extra1 = &one,
1da177e4 LT	203	},
1da177e4 LT	204	{
1da177e4 LT	205	.procname = "rmem_max",
	206	.data = &sysctl_rmem_max,
	207	.maxlen = sizeof(int),
	208	.mode = 0644,
cdda8891	209	.proc_handler = proc_dointvec_minmax,
cdda8891	210	.extra1 = &one,
1da177e4 LT	211	},
1da177e4 LT	212	{
1da177e4 LT	213	.procname = "wmem_default",
	214	.data = &sysctl_wmem_default,
	215	.maxlen = sizeof(int),
	216	.mode = 0644,
cdda8891	217	.proc_handler = proc_dointvec_minmax,
cdda8891	218	.extra1 = &one,
1da177e4 LT	219	},
1da177e4 LT	220	{
1da177e4 LT	221	.procname = "rmem_default",
	222	.data = &sysctl_rmem_default,
	223	.maxlen = sizeof(int),
	224	.mode = 0644,
cdda8891	225	.proc_handler = proc_dointvec_minmax,
cdda8891	226	.extra1 = &one,
1da177e4 LT	227	},
1da177e4 LT	228	{
1da177e4 LT	229	.procname = "dev_weight",
	230	.data = &weight_p,
	231	.maxlen = sizeof(int),
	232	.mode = 0644,
6d9f239a	233	.proc_handler = proc_dointvec
1da177e4 LT	234	},
1da177e4 LT	235	{
1da177e4 LT	236	.procname = "netdev_max_backlog",
	237	.data = &netdev_max_backlog,
	238	.maxlen = sizeof(int),
	239	.mode = 0644,
6d9f239a	240	.proc_handler = proc_dointvec
1da177e4	241	},
0a14842f ED	242	#ifdef CONFIG_BPF_JIT
	243	{
	244	.procname = "bpf_jit_enable",
	245	.data = &bpf_jit_enable,
	246	.maxlen = sizeof(int),
	247	.mode = 0644,
	248	.proc_handler = proc_dointvec
	249	},
	250	#endif
3b098e2d ED	251	{
	252	.procname = "netdev_tstamp_prequeue",
	253	.data = &netdev_tstamp_prequeue,
	254	.maxlen = sizeof(int),
	255	.mode = 0644,
	256	.proc_handler = proc_dointvec
	257	},
1da177e4	258	{
1da177e4	259	.procname = "message_cost",
717115e1	260	.data = &net_ratelimit_state.interval,
1da177e4 LT	261	.maxlen = sizeof(int),
1da177e4 LT	262	.mode = 0644,
6d9f239a	263	.proc_handler = proc_dointvec_jiffies,
1da177e4 LT	264	},
1da177e4 LT	265	{
1da177e4	266	.procname = "message_burst",
717115e1	267	.data = &net_ratelimit_state.burst,
1da177e4 LT	268	.maxlen = sizeof(int),
1da177e4 LT	269	.mode = 0644,
6d9f239a	270	.proc_handler = proc_dointvec,
1da177e4 LT	271	},
1da177e4 LT	272	{
1da177e4 LT	273	.procname = "optmem_max",
	274	.data = &sysctl_optmem_max,
	275	.maxlen = sizeof(int),
	276	.mode = 0644,
6d9f239a	277	.proc_handler = proc_dointvec
1da177e4	278	},
fec5e652 TH	279	#ifdef CONFIG_RPS
	280	{
	281	.procname = "rps_sock_flow_entries",
	282	.maxlen = sizeof(int),
	283	.mode = 0644,
	284	.proc_handler = rps_sock_flow_sysctl
	285	},
	286	#endif
99bbc707 WB	287	#ifdef CONFIG_NET_FLOW_LIMIT
	288	{
	289	.procname = "flow_limit_cpu_bitmap",
	290	.mode = 0644,
	291	.proc_handler = flow_limit_cpu_sysctl
	292	},
	293	{
	294	.procname = "flow_limit_table_len",
	295	.data = &netdev_flow_limit_table_len,
	296	.maxlen = sizeof(int),
	297	.mode = 0644,
	298	.proc_handler = flow_limit_table_len_sysctl
	299	},
	300	#endif /* CONFIG_NET_FLOW_LIMIT */
06021292 ET	301	#ifdef CONFIG_NET_LL_RX_POLL
06021292 ET	302	{
64b0dc51 ET	303	.procname = "busy_poll",
64b0dc51 ET	304	.data = &sysctl_net_busy_poll,
eb6db622	305	.maxlen = sizeof(unsigned int),
06021292	306	.mode = 0644,
eb6db622	307	.proc_handler = proc_dointvec
06021292	308	},
2d48d67f	309	{
64b0dc51 ET	310	.procname = "busy_read",
64b0dc51 ET	311	.data = &sysctl_net_busy_read,
2d48d67f ET	312	.maxlen = sizeof(unsigned int),
	313	.mode = 0644,
	314	.proc_handler = proc_dointvec
	315	},
	316	#
06021292	317	#endif
1da177e4	318	#endif /* CONFIG_NET */
51b0bded	319	{
51b0bded SH	320	.procname = "netdev_budget",
	321	.data = &netdev_budget,
	322	.maxlen = sizeof(int),
	323	.mode = 0644,
6d9f239a	324	.proc_handler = proc_dointvec
51b0bded	325	},
a2a316fd	326	{
a2a316fd SH	327	.procname = "warnings",
	328	.data = &net_msg_warn,
	329	.maxlen = sizeof(int),
	330	.mode = 0644,
6d9f239a	331	.proc_handler = proc_dointvec
a2a316fd	332	},
f8572d8f	333	{ }
1da177e4	334	};
33eb9cfc	335
d5a4502e PE	336	static struct ctl_table netns_core_table[] = {
d5a4502e PE	337	{
d5a4502e PE	338	.procname = "somaxconn",
	339	.data = &init_net.core.sysctl_somaxconn,
	340	.maxlen = sizeof(int),
	341	.mode = 0644,
6d9f239a	342	.proc_handler = proc_dointvec
d5a4502e	343	},
f8572d8f	344	{ }
d5a4502e PE	345	};
d5a4502e PE	346
024626e3	347	static __net_init int sysctl_core_net_init(struct net *net)
33eb9cfc	348	{
d5a4502e	349	struct ctl_table *tbl;
024626e3	350
8efa6e93	351	net->core.sysctl_somaxconn = SOMAXCONN;
b8e1f9b5	352
d5a4502e	353	tbl = netns_core_table;
09ad9bc7	354	if (!net_eq(net, &init_net)) {
d5a4502e	355	tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
024626e3 PE	356	if (tbl == NULL)
	357	goto err_dup;
	358
d5a4502e	359	tbl[0].data = &net->core.sysctl_somaxconn;
464dc801 EB	360
	361	/* Don't export any sysctls to unprivileged users */
	362	if (net->user_ns != &init_user_ns) {
	363	tbl[0].procname = NULL;
	364	}
024626e3 PE	365	}
024626e3 PE	366
ec8f23ce	367	net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
8efa6e93	368	if (net->core.sysctl_hdr == NULL)
024626e3	369	goto err_reg;
33eb9cfc	370
024626e3 PE	371	return 0;
	372
	373	err_reg:
d5a4502e	374	if (tbl != netns_core_table)
024626e3 PE	375	kfree(tbl);
	376	err_dup:
	377	return -ENOMEM;
	378	}
	379
	380	static __net_exit void sysctl_core_net_exit(struct net *net)
	381	{
	382	struct ctl_table *tbl;
	383
8efa6e93 PE	384	tbl = net->core.sysctl_hdr->ctl_table_arg;
8efa6e93 PE	385	unregister_net_sysctl_table(net->core.sysctl_hdr);
d5a4502e	386	BUG_ON(tbl == netns_core_table);
024626e3 PE	387	kfree(tbl);
	388	}
	389
	390	static __net_initdata struct pernet_operations sysctl_core_ops = {
	391	.init = sysctl_core_net_init,
	392	.exit = sysctl_core_net_exit,
	393	};
	394
	395	static __init int sysctl_core_init(void)
	396	{
43444757	397	register_net_sysctl(&init_net, "net/core", net_core_table);
024626e3	398	return register_pernet_subsys(&sysctl_core_ops);
33eb9cfc PE	399	}
33eb9cfc PE	400
b27aeadb	401	fs_initcall(sysctl_core_init);