[deliverable/linux.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 zero = 0;
static int one = 1;
static int ushort_max = USHRT_MAX;

#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_RX_BUSY_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,
		.extra1		= &zero,
		.extra2		= &ushort_max,
		.proc_handler	= proc_dointvec_minmax
	},
	{ }
};

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
5f671d6b	24	static int zero = 0;
cdda8891	25	static int one = 1;
5f671d6b	26	static int ushort_max = USHRT_MAX;
cdda8891	27
fec5e652	28	#ifdef CONFIG_RPS
fe2c6338	29	static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
fec5e652 TH	30	void __user buffer, size_t lenp, loff_t *ppos)
	31	{
	32	unsigned int orig_size, size;
	33	int ret, i;
fe2c6338	34	struct ctl_table tmp = {
fec5e652 TH	35	.data = &size,
	36	.maxlen = sizeof(size),
	37	.mode = table->mode
	38	};
	39	struct rps_sock_flow_table orig_sock_table, sock_table;
	40	static DEFINE_MUTEX(sock_flow_mutex);
	41
	42	mutex_lock(&sock_flow_mutex);
	43
6e3f7faf ED	44	orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
6e3f7faf ED	45	lockdep_is_held(&sock_flow_mutex));
fec5e652 TH	46	size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
	47
	48	ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
	49
	50	if (write) {
	51	if (size) {
	52	if (size > 1<<30) {
	53	/* Enforce limit to prevent overflow */
	54	mutex_unlock(&sock_flow_mutex);
	55	return -EINVAL;
	56	}
	57	size = roundup_pow_of_two(size);
	58	if (size != orig_size) {
	59	sock_table =
	60	vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
	61	if (!sock_table) {
	62	mutex_unlock(&sock_flow_mutex);
	63	return -ENOMEM;
	64	}
	65
	66	sock_table->mask = size - 1;
	67	} else
	68	sock_table = orig_sock_table;
	69
	70	for (i = 0; i < size; i++)
	71	sock_table->ents[i] = RPS_NO_CPU;
	72	} else
	73	sock_table = NULL;
	74
	75	if (sock_table != orig_sock_table) {
	76	rcu_assign_pointer(rps_sock_flow_table, sock_table);
adc9300e	77	if (sock_table)
c5905afb	78	static_key_slow_inc(&rps_needed);
adc9300e	79	if (orig_sock_table) {
c5905afb	80	static_key_slow_dec(&rps_needed);
adc9300e ED	81	synchronize_rcu();
	82	vfree(orig_sock_table);
	83	}
fec5e652 TH	84	}
	85	}
	86
	87	mutex_unlock(&sock_flow_mutex);
	88
	89	return ret;
	90	}
	91	#endif /* CONFIG_RPS */
	92
99bbc707 WB	93	#ifdef CONFIG_NET_FLOW_LIMIT
	94	static DEFINE_MUTEX(flow_limit_update_mutex);
	95
fe2c6338	96	static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
99bbc707 WB	97	void __user buffer, size_t lenp,
	98	loff_t *ppos)
	99	{
	100	struct sd_flow_limit *cur;
	101	struct softnet_data *sd;
	102	cpumask_var_t mask;
	103	int i, len, ret = 0;
	104
	105	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	106	return -ENOMEM;
	107
	108	if (write) {
	109	ret = cpumask_parse_user(buffer, *lenp, mask);
	110	if (ret)
	111	goto done;
	112
	113	mutex_lock(&flow_limit_update_mutex);
	114	len = sizeof(*cur) + netdev_flow_limit_table_len;
	115	for_each_possible_cpu(i) {
	116	sd = &per_cpu(softnet_data, i);
	117	cur = rcu_dereference_protected(sd->flow_limit,
	118	lockdep_is_held(&flow_limit_update_mutex));
	119	if (cur && !cpumask_test_cpu(i, mask)) {
	120	RCU_INIT_POINTER(sd->flow_limit, NULL);
	121	synchronize_rcu();
	122	kfree(cur);
	123	} else if (!cur && cpumask_test_cpu(i, mask)) {
	124	cur = kzalloc(len, GFP_KERNEL);
	125	if (!cur) {
	126	/* not unwinding previous changes */
	127	ret = -ENOMEM;
	128	goto write_unlock;
	129	}
	130	cur->num_buckets = netdev_flow_limit_table_len;
	131	rcu_assign_pointer(sd->flow_limit, cur);
	132	}
	133	}
	134	write_unlock:
	135	mutex_unlock(&flow_limit_update_mutex);
	136	} else {
5f121b9a WB	137	char kbuf[128];
5f121b9a WB	138
99bbc707 WB	139	if (ppos \|\| !lenp) {
	140	*lenp = 0;
	141	goto done;
	142	}
	143
	144	cpumask_clear(mask);
	145	rcu_read_lock();
	146	for_each_possible_cpu(i) {
	147	sd = &per_cpu(softnet_data, i);
	148	if (rcu_dereference(sd->flow_limit))
	149	cpumask_set_cpu(i, mask);
	150	}
	151	rcu_read_unlock();
	152
5f121b9a WB	153	len = min(sizeof(kbuf) - 1, *lenp);
	154	len = cpumask_scnprintf(kbuf, len, mask);
	155	if (!len) {
	156	*lenp = 0;
	157	goto done;
	158	}
	159	if (len < *lenp)
	160	kbuf[len++] = '\n';
	161	if (copy_to_user(buffer, kbuf, len)) {
	162	ret = -EFAULT;
	163	goto done;
	164	}
	165	*lenp = len;
	166	*ppos += len;
99bbc707 WB	167	}
	168
	169	done:
	170	free_cpumask_var(mask);
	171	return ret;
	172	}
	173
fe2c6338	174	static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
99bbc707 WB	175	void __user buffer, size_t lenp,
	176	loff_t *ppos)
	177	{
	178	unsigned int old, *ptr;
	179	int ret;
	180
	181	mutex_lock(&flow_limit_update_mutex);
	182
	183	ptr = table->data;
	184	old = *ptr;
	185	ret = proc_dointvec(table, write, buffer, lenp, ppos);
	186	if (!ret && write && !is_power_of_2(*ptr)) {
	187	*ptr = old;
	188	ret = -EINVAL;
	189	}
	190
	191	mutex_unlock(&flow_limit_update_mutex);
	192	return ret;
	193	}
	194	#endif /* CONFIG_NET_FLOW_LIMIT */
	195
33eb9cfc	196	static struct ctl_table net_core_table[] = {
1da177e4 LT	197	#ifdef CONFIG_NET
1da177e4 LT	198	{
1da177e4 LT	199	.procname = "wmem_max",
	200	.data = &sysctl_wmem_max,
	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_max",
	208	.data = &sysctl_rmem_max,
	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 = "wmem_default",
	216	.data = &sysctl_wmem_default,
	217	.maxlen = sizeof(int),
	218	.mode = 0644,
cdda8891	219	.proc_handler = proc_dointvec_minmax,
cdda8891	220	.extra1 = &one,
1da177e4 LT	221	},
1da177e4 LT	222	{
1da177e4 LT	223	.procname = "rmem_default",
	224	.data = &sysctl_rmem_default,
	225	.maxlen = sizeof(int),
	226	.mode = 0644,
cdda8891	227	.proc_handler = proc_dointvec_minmax,
cdda8891	228	.extra1 = &one,
1da177e4 LT	229	},
1da177e4 LT	230	{
1da177e4 LT	231	.procname = "dev_weight",
	232	.data = &weight_p,
	233	.maxlen = sizeof(int),
	234	.mode = 0644,
6d9f239a	235	.proc_handler = proc_dointvec
1da177e4 LT	236	},
1da177e4 LT	237	{
1da177e4 LT	238	.procname = "netdev_max_backlog",
	239	.data = &netdev_max_backlog,
	240	.maxlen = sizeof(int),
	241	.mode = 0644,
6d9f239a	242	.proc_handler = proc_dointvec
1da177e4	243	},
0a14842f ED	244	#ifdef CONFIG_BPF_JIT
	245	{
	246	.procname = "bpf_jit_enable",
	247	.data = &bpf_jit_enable,
	248	.maxlen = sizeof(int),
	249	.mode = 0644,
	250	.proc_handler = proc_dointvec
	251	},
	252	#endif
3b098e2d ED	253	{
	254	.procname = "netdev_tstamp_prequeue",
	255	.data = &netdev_tstamp_prequeue,
	256	.maxlen = sizeof(int),
	257	.mode = 0644,
	258	.proc_handler = proc_dointvec
	259	},
1da177e4	260	{
1da177e4	261	.procname = "message_cost",
717115e1	262	.data = &net_ratelimit_state.interval,
1da177e4 LT	263	.maxlen = sizeof(int),
1da177e4 LT	264	.mode = 0644,
6d9f239a	265	.proc_handler = proc_dointvec_jiffies,
1da177e4 LT	266	},
1da177e4 LT	267	{
1da177e4	268	.procname = "message_burst",
717115e1	269	.data = &net_ratelimit_state.burst,
1da177e4 LT	270	.maxlen = sizeof(int),
1da177e4 LT	271	.mode = 0644,
6d9f239a	272	.proc_handler = proc_dointvec,
1da177e4 LT	273	},
1da177e4 LT	274	{
1da177e4 LT	275	.procname = "optmem_max",
	276	.data = &sysctl_optmem_max,
	277	.maxlen = sizeof(int),
	278	.mode = 0644,
6d9f239a	279	.proc_handler = proc_dointvec
1da177e4	280	},
fec5e652 TH	281	#ifdef CONFIG_RPS
	282	{
	283	.procname = "rps_sock_flow_entries",
	284	.maxlen = sizeof(int),
	285	.mode = 0644,
	286	.proc_handler = rps_sock_flow_sysctl
	287	},
	288	#endif
99bbc707 WB	289	#ifdef CONFIG_NET_FLOW_LIMIT
	290	{
	291	.procname = "flow_limit_cpu_bitmap",
	292	.mode = 0644,
	293	.proc_handler = flow_limit_cpu_sysctl
	294	},
	295	{
	296	.procname = "flow_limit_table_len",
	297	.data = &netdev_flow_limit_table_len,
	298	.maxlen = sizeof(int),
	299	.mode = 0644,
	300	.proc_handler = flow_limit_table_len_sysctl
	301	},
	302	#endif /* CONFIG_NET_FLOW_LIMIT */
e0d1095a	303	#ifdef CONFIG_NET_RX_BUSY_POLL
06021292	304	{
64b0dc51 ET	305	.procname = "busy_poll",
64b0dc51 ET	306	.data = &sysctl_net_busy_poll,
eb6db622	307	.maxlen = sizeof(unsigned int),
06021292	308	.mode = 0644,
eb6db622	309	.proc_handler = proc_dointvec
06021292	310	},
2d48d67f	311	{
64b0dc51 ET	312	.procname = "busy_read",
64b0dc51 ET	313	.data = &sysctl_net_busy_read,
2d48d67f ET	314	.maxlen = sizeof(unsigned int),
	315	.mode = 0644,
	316	.proc_handler = proc_dointvec
	317	},
	318	#
06021292	319	#endif
1da177e4	320	#endif /* CONFIG_NET */
51b0bded	321	{
51b0bded SH	322	.procname = "netdev_budget",
	323	.data = &netdev_budget,
	324	.maxlen = sizeof(int),
	325	.mode = 0644,
6d9f239a	326	.proc_handler = proc_dointvec
51b0bded	327	},
a2a316fd	328	{
a2a316fd SH	329	.procname = "warnings",
	330	.data = &net_msg_warn,
	331	.maxlen = sizeof(int),
	332	.mode = 0644,
6d9f239a	333	.proc_handler = proc_dointvec
a2a316fd	334	},
f8572d8f	335	{ }
1da177e4	336	};
33eb9cfc	337
d5a4502e PE	338	static struct ctl_table netns_core_table[] = {
d5a4502e PE	339	{
d5a4502e PE	340	.procname = "somaxconn",
	341	.data = &init_net.core.sysctl_somaxconn,
	342	.maxlen = sizeof(int),
	343	.mode = 0644,
5f671d6b RG	344	.extra1 = &zero,
	345	.extra2 = &ushort_max,
	346	.proc_handler = proc_dointvec_minmax
d5a4502e	347	},
f8572d8f	348	{ }
d5a4502e PE	349	};
d5a4502e PE	350
024626e3	351	static __net_init int sysctl_core_net_init(struct net *net)
33eb9cfc	352	{
d5a4502e	353	struct ctl_table *tbl;
024626e3	354
8efa6e93	355	net->core.sysctl_somaxconn = SOMAXCONN;
b8e1f9b5	356
d5a4502e	357	tbl = netns_core_table;
09ad9bc7	358	if (!net_eq(net, &init_net)) {
d5a4502e	359	tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
024626e3 PE	360	if (tbl == NULL)
	361	goto err_dup;
	362
d5a4502e	363	tbl[0].data = &net->core.sysctl_somaxconn;
464dc801 EB	364
	365	/* Don't export any sysctls to unprivileged users */
	366	if (net->user_ns != &init_user_ns) {
	367	tbl[0].procname = NULL;
	368	}
024626e3 PE	369	}
024626e3 PE	370
ec8f23ce	371	net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
8efa6e93	372	if (net->core.sysctl_hdr == NULL)
024626e3	373	goto err_reg;
33eb9cfc	374
024626e3 PE	375	return 0;
	376
	377	err_reg:
d5a4502e	378	if (tbl != netns_core_table)
024626e3 PE	379	kfree(tbl);
	380	err_dup:
	381	return -ENOMEM;
	382	}
	383
	384	static __net_exit void sysctl_core_net_exit(struct net *net)
	385	{
	386	struct ctl_table *tbl;
	387
8efa6e93 PE	388	tbl = net->core.sysctl_hdr->ctl_table_arg;
8efa6e93 PE	389	unregister_net_sysctl_table(net->core.sysctl_hdr);
d5a4502e	390	BUG_ON(tbl == netns_core_table);
024626e3 PE	391	kfree(tbl);
	392	}
	393
	394	static __net_initdata struct pernet_operations sysctl_core_ops = {
	395	.init = sysctl_core_net_init,
	396	.exit = sysctl_core_net_exit,
	397	};
	398
	399	static __init int sysctl_core_init(void)
	400	{
43444757	401	register_net_sysctl(&init_net, "net/core", net_core_table);
024626e3	402	return register_pernet_subsys(&sysctl_core_ops);
33eb9cfc PE	403	}
33eb9cfc PE	404
b27aeadb	405	fs_initcall(sysctl_core_init);