sysctl_net_ipv4.c 19.7 KB
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/*
 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
 *
 * Begun April 1, 1996, Mike Shaver.
 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
 */

#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sysctl.h>
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#include <linux/igmp.h>
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#include <linux/inetdevice.h>
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#include <linux/seqlock.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/nsproxy.h>
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#include <linux/swap.h>
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#include <net/snmp.h>
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#include <net/icmp.h>
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#include <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/cipso_ipv4.h>
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#include <net/inet_frag.h>
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#include <net/ping.h>
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#include <net/tcp_memcontrol.h>
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static int zero;
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static int two = 2;
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static int tcp_retr1_max = 255;
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static int ip_local_port_range_min[] = { 1, 1 };
static int ip_local_port_range_max[] = { 65535, 65535 };
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static int tcp_adv_win_scale_min = -31;
static int tcp_adv_win_scale_max = 31;
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static int ip_ttl_min = 1;
static int ip_ttl_max = 255;
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static int ip_ping_group_range_min[] = { 0, 0 };
static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
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/* Update system visible IP port range */
static void set_local_port_range(int range[2])
{
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	write_seqlock(&sysctl_local_ports.lock);
	sysctl_local_ports.range[0] = range[0];
	sysctl_local_ports.range[1] = range[1];
	write_sequnlock(&sysctl_local_ports.lock);
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}

/* Validate changes from /proc interface. */
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static int ipv4_local_port_range(ctl_table *table, int write,
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				 void __user *buffer,
				 size_t *lenp, loff_t *ppos)
{
	int ret;
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	int range[2];
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	ctl_table tmp = {
		.data = &range,
		.maxlen = sizeof(range),
		.mode = table->mode,
		.extra1 = &ip_local_port_range_min,
		.extra2 = &ip_local_port_range_max,
	};

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	inet_get_local_port_range(range, range + 1);
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	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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	if (write && ret == 0) {
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		if (range[1] < range[0])
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			ret = -EINVAL;
		else
			set_local_port_range(range);
	}

	return ret;
}

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static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high)
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{
	gid_t *data = table->data;
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	unsigned int seq;
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	do {
		seq = read_seqbegin(&sysctl_local_ports.lock);

		*low = data[0];
		*high = data[1];
	} while (read_seqretry(&sysctl_local_ports.lock, seq));
}

/* Update system visible IP port range */
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static void set_ping_group_range(struct ctl_table *table, gid_t range[2])
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{
	gid_t *data = table->data;
	write_seqlock(&sysctl_local_ports.lock);
	data[0] = range[0];
	data[1] = range[1];
	write_sequnlock(&sysctl_local_ports.lock);
}

/* Validate changes from /proc interface. */
static int ipv4_ping_group_range(ctl_table *table, int write,
				 void __user *buffer,
				 size_t *lenp, loff_t *ppos)
{
	int ret;
	gid_t range[2];
	ctl_table tmp = {
		.data = &range,
		.maxlen = sizeof(range),
		.mode = table->mode,
		.extra1 = &ip_ping_group_range_min,
		.extra2 = &ip_ping_group_range_max,
	};

	inet_get_ping_group_range_table(table, range, range + 1);
	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);

	if (write && ret == 0)
		set_ping_group_range(table, range);

	return ret;
}

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static int proc_tcp_congestion_control(ctl_table *ctl, int write,
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				       void __user *buffer, size_t *lenp, loff_t *ppos)
{
	char val[TCP_CA_NAME_MAX];
	ctl_table tbl = {
		.data = val,
		.maxlen = TCP_CA_NAME_MAX,
	};
	int ret;

	tcp_get_default_congestion_control(val);

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	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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	if (write && ret == 0)
		ret = tcp_set_default_congestion_control(val);
	return ret;
}

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static int proc_tcp_available_congestion_control(ctl_table *ctl,
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						 int write,
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						 void __user *buffer, size_t *lenp,
						 loff_t *ppos)
{
	ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
	int ret;

	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
	if (!tbl.data)
		return -ENOMEM;
	tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
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	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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	kfree(tbl.data);
	return ret;
}

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static int proc_allowed_congestion_control(ctl_table *ctl,
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					   int write,
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					   void __user *buffer, size_t *lenp,
					   loff_t *ppos)
{
	ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
	int ret;

	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
	if (!tbl.data)
		return -ENOMEM;

	tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
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	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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	if (write && ret == 0)
		ret = tcp_set_allowed_congestion_control(tbl.data);
	kfree(tbl.data);
	return ret;
}

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static int ipv4_tcp_mem(ctl_table *ctl, int write,
			   void __user *buffer, size_t *lenp,
			   loff_t *ppos)
{
	int ret;
	unsigned long vec[3];
	struct net *net = current->nsproxy->net_ns;
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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
	struct mem_cgroup *memcg;
#endif
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	ctl_table tmp = {
		.data = &vec,
		.maxlen = sizeof(vec),
		.mode = ctl->mode,
	};

	if (!write) {
		ctl->data = &net->ipv4.sysctl_tcp_mem;
		return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
	}

	ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
	if (ret)
		return ret;

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#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
	rcu_read_lock();
	memcg = mem_cgroup_from_task(current);

	tcp_prot_mem(memcg, vec[0], 0);
	tcp_prot_mem(memcg, vec[1], 1);
	tcp_prot_mem(memcg, vec[2], 2);
	rcu_read_unlock();
#endif

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	net->ipv4.sysctl_tcp_mem[0] = vec[0];
	net->ipv4.sysctl_tcp_mem[1] = vec[1];
	net->ipv4.sysctl_tcp_mem[2] = vec[2];

	return 0;
}

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static struct ctl_table ipv4_table[] = {
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	{
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		.procname	= "tcp_timestamps",
		.data		= &sysctl_tcp_timestamps,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
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	{
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		.procname	= "tcp_window_scaling",
		.data		= &sysctl_tcp_window_scaling,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
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	{
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		.procname	= "tcp_sack",
		.data		= &sysctl_tcp_sack,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
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	{
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		.procname	= "tcp_retrans_collapse",
		.data		= &sysctl_tcp_retrans_collapse,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
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	{
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		.procname	= "ip_default_ttl",
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		.data		= &sysctl_ip_default_ttl,
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		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &ip_ttl_min,
		.extra2		= &ip_ttl_max,
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	},
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	{
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		.procname	= "ip_no_pmtu_disc",
		.data		= &ipv4_config.no_pmtu_disc,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "ip_nonlocal_bind",
		.data		= &sysctl_ip_nonlocal_bind,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_syn_retries",
		.data		= &sysctl_tcp_syn_retries,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_synack_retries",
		.data		= &sysctl_tcp_synack_retries,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_max_orphans",
		.data		= &sysctl_tcp_max_orphans,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_max_tw_buckets",
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		.data		= &tcp_death_row.sysctl_max_tw_buckets,
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		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "ip_dynaddr",
		.data		= &sysctl_ip_dynaddr,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_keepalive_time",
		.data		= &sysctl_tcp_keepalive_time,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_jiffies,
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	},
	{
		.procname	= "tcp_keepalive_probes",
		.data		= &sysctl_tcp_keepalive_probes,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_keepalive_intvl",
		.data		= &sysctl_tcp_keepalive_intvl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_jiffies,
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	},
	{
		.procname	= "tcp_retries1",
		.data		= &sysctl_tcp_retries1,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_minmax,
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		.extra2		= &tcp_retr1_max
	},
	{
		.procname	= "tcp_retries2",
		.data		= &sysctl_tcp_retries2,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_fin_timeout",
		.data		= &sysctl_tcp_fin_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_jiffies,
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	},
#ifdef CONFIG_SYN_COOKIES
	{
		.procname	= "tcp_syncookies",
		.data		= &sysctl_tcp_syncookies,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
#endif
	{
		.procname	= "tcp_tw_recycle",
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		.data		= &tcp_death_row.sysctl_tw_recycle,
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		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_abort_on_overflow",
		.data		= &sysctl_tcp_abort_on_overflow,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_stdurg",
		.data		= &sysctl_tcp_stdurg,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_rfc1337",
		.data		= &sysctl_tcp_rfc1337,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_max_syn_backlog",
		.data		= &sysctl_max_syn_backlog,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "ip_local_port_range",
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		.data		= &sysctl_local_ports.range,
		.maxlen		= sizeof(sysctl_local_ports.range),
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		.mode		= 0644,
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		.proc_handler	= ipv4_local_port_range,
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	},
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	{
		.procname	= "ip_local_reserved_ports",
		.data		= NULL, /* initialized in sysctl_ipv4_init */
		.maxlen		= 65536,
		.mode		= 0644,
		.proc_handler	= proc_do_large_bitmap,
	},
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	{
		.procname	= "igmp_max_memberships",
		.data		= &sysctl_igmp_max_memberships,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "igmp_max_msf",
		.data		= &sysctl_igmp_max_msf,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "inet_peer_threshold",
		.data		= &inet_peer_threshold,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "inet_peer_minttl",
		.data		= &inet_peer_minttl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_jiffies,
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	},
	{
		.procname	= "inet_peer_maxttl",
		.data		= &inet_peer_maxttl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec_jiffies,
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	},
	{
		.procname	= "tcp_orphan_retries",
		.data		= &sysctl_tcp_orphan_retries,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_fack",
		.data		= &sysctl_tcp_fack,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_reordering",
		.data		= &sysctl_tcp_reordering,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_ecn",
		.data		= &sysctl_tcp_ecn,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_dsack",
		.data		= &sysctl_tcp_dsack,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_wmem",
		.data		= &sysctl_tcp_wmem,
		.maxlen		= sizeof(sysctl_tcp_wmem),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_rmem",
		.data		= &sysctl_tcp_rmem,
		.maxlen		= sizeof(sysctl_tcp_rmem),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
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	},
	{
		.procname	= "tcp_app_win",
		.data		= &sysctl_tcp_app_win,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
L
Linus Torvalds 已提交
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	},
	{
		.procname	= "tcp_adv_win_scale",
		.data		= &sysctl_tcp_adv_win_scale,
		.maxlen		= sizeof(int),
		.mode		= 0644,
507 508 509
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &tcp_adv_win_scale_min,
		.extra2		= &tcp_adv_win_scale_max,
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Linus Torvalds 已提交
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	},
	{
		.procname	= "tcp_tw_reuse",
		.data		= &sysctl_tcp_tw_reuse,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec
L
Linus Torvalds 已提交
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	},
	{
		.procname	= "tcp_frto",
		.data		= &sysctl_tcp_frto,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
L
Linus Torvalds 已提交
524
	},
525 526 527 528 529
	{
		.procname	= "tcp_frto_response",
		.data		= &sysctl_tcp_frto_response,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec
531
	},
L
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	{
		.procname	= "tcp_low_latency",
		.data		= &sysctl_tcp_low_latency,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec
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Linus Torvalds 已提交
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	},
	{
		.procname	= "tcp_no_metrics_save",
		.data		= &sysctl_tcp_nometrics_save,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
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Linus Torvalds 已提交
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	},
	{
		.procname	= "tcp_moderate_rcvbuf",
		.data		= &sysctl_tcp_moderate_rcvbuf,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
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	},
	{
		.procname	= "tcp_tso_win_divisor",
		.data		= &sysctl_tcp_tso_win_divisor,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec,
L
Linus Torvalds 已提交
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	},
	{
561
		.procname	= "tcp_congestion_control",
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Linus Torvalds 已提交
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		.mode		= 0644,
563
		.maxlen		= TCP_CA_NAME_MAX,
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		.proc_handler	= proc_tcp_congestion_control,
L
Linus Torvalds 已提交
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	},
566 567 568 569 570
	{
		.procname	= "tcp_abc",
		.data		= &sysctl_tcp_abc,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
572
	},
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John Heffner 已提交
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	{
		.procname	= "tcp_mtu_probing",
		.data		= &sysctl_tcp_mtu_probing,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
J
John Heffner 已提交
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	},
	{
		.procname	= "tcp_base_mss",
		.data		= &sysctl_tcp_base_mss,
		.maxlen		= sizeof(int),
		.mode		= 0644,
A
Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
J
John Heffner 已提交
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	},
587
	{
588 589 590 591
		.procname	= "tcp_workaround_signed_windows",
		.data		= &sysctl_tcp_workaround_signed_windows,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec
593
	},
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#ifdef CONFIG_NET_DMA
	{
		.procname	= "tcp_dma_copybreak",
		.data		= &sysctl_tcp_dma_copybreak,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
601 602
	},
#endif
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	{
		.procname	= "tcp_slow_start_after_idle",
		.data		= &sysctl_tcp_slow_start_after_idle,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec
609
	},
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#ifdef CONFIG_NETLABEL
	{
		.procname	= "cipso_cache_enable",
		.data		= &cipso_v4_cache_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
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	},
	{
		.procname	= "cipso_cache_bucket_size",
		.data		= &cipso_v4_cache_bucketsize,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
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	},
	{
		.procname	= "cipso_rbm_optfmt",
		.data		= &cipso_v4_rbm_optfmt,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
P
Paul Moore 已提交
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	},
	{
		.procname	= "cipso_rbm_strictvalid",
		.data		= &cipso_v4_rbm_strictvalid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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		.proc_handler	= proc_dointvec,
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Paul Moore 已提交
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	},
#endif /* CONFIG_NETLABEL */
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	{
		.procname	= "tcp_available_congestion_control",
		.maxlen		= TCP_CA_BUF_MAX,
		.mode		= 0444,
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		.proc_handler   = proc_tcp_available_congestion_control,
645
	},
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	{
		.procname	= "tcp_allowed_congestion_control",
		.maxlen		= TCP_CA_BUF_MAX,
		.mode		= 0644,
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		.proc_handler   = proc_allowed_congestion_control,
651
	},
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	{
		.procname	= "tcp_max_ssthresh",
		.data		= &sysctl_tcp_max_ssthresh,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec,
658
	},
659 660 661 662 663 664 665
	{
		.procname	= "tcp_cookie_size",
		.data		= &sysctl_tcp_cookie_size,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
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Andreas Petlund 已提交
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	{
		.procname       = "tcp_thin_linear_timeouts",
		.data           = &sysctl_tcp_thin_linear_timeouts,
		.maxlen         = sizeof(int),
		.mode           = 0644,
		.proc_handler   = proc_dointvec
	},
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Andreas Petlund 已提交
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        {
		.procname       = "tcp_thin_dupack",
		.data           = &sysctl_tcp_thin_dupack,
		.maxlen         = sizeof(int),
		.mode           = 0644,
		.proc_handler   = proc_dointvec
	},
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Yuchung Cheng 已提交
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	{
		.procname	= "tcp_early_retrans",
		.data		= &sysctl_tcp_early_retrans,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &two,
	},
H
Hideo Aoki 已提交
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	{
		.procname	= "udp_mem",
		.data		= &sysctl_udp_mem,
		.maxlen		= sizeof(sysctl_udp_mem),
		.mode		= 0644,
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Eric Dumazet 已提交
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		.proc_handler	= proc_doulongvec_minmax,
H
Hideo Aoki 已提交
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	},
	{
		.procname	= "udp_rmem_min",
		.data		= &sysctl_udp_rmem_min,
		.maxlen		= sizeof(sysctl_udp_rmem_min),
		.mode		= 0644,
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Alexey Dobriyan 已提交
701
		.proc_handler	= proc_dointvec_minmax,
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Hideo Aoki 已提交
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		.extra1		= &zero
	},
	{
		.procname	= "udp_wmem_min",
		.data		= &sysctl_udp_wmem_min,
		.maxlen		= sizeof(sysctl_udp_wmem_min),
		.mode		= 0644,
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Alexey Dobriyan 已提交
709
		.proc_handler	= proc_dointvec_minmax,
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Hideo Aoki 已提交
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		.extra1		= &zero
	},
712
	{ }
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Linus Torvalds 已提交
713
};
714

715 716 717 718 719 720
static struct ctl_table ipv4_net_table[] = {
	{
		.procname	= "icmp_echo_ignore_all",
		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_all,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
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		.proc_handler	= proc_dointvec
722 723 724 725 726 727
	},
	{
		.procname	= "icmp_echo_ignore_broadcasts",
		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
728
		.proc_handler	= proc_dointvec
729 730 731 732 733 734
	},
	{
		.procname	= "icmp_ignore_bogus_error_responses",
		.data		= &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
735
		.proc_handler	= proc_dointvec
736 737 738 739 740 741
	},
	{
		.procname	= "icmp_errors_use_inbound_ifaddr",
		.data		= &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
		.maxlen		= sizeof(int),
		.mode		= 0644,
A
Alexey Dobriyan 已提交
742
		.proc_handler	= proc_dointvec
743 744 745 746 747 748
	},
	{
		.procname	= "icmp_ratelimit",
		.data		= &init_net.ipv4.sysctl_icmp_ratelimit,
		.maxlen		= sizeof(int),
		.mode		= 0644,
A
Alexey Dobriyan 已提交
749
		.proc_handler	= proc_dointvec_ms_jiffies,
750 751 752 753 754 755
	},
	{
		.procname	= "icmp_ratemask",
		.data		= &init_net.ipv4.sysctl_icmp_ratemask,
		.maxlen		= sizeof(int),
		.mode		= 0644,
A
Alexey Dobriyan 已提交
756
		.proc_handler	= proc_dointvec
757
	},
758 759 760 761 762
	{
		.procname	= "rt_cache_rebuild_count",
		.data		= &init_net.ipv4.sysctl_rt_cache_rebuild_count,
		.maxlen		= sizeof(int),
		.mode		= 0644,
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Alexey Dobriyan 已提交
763
		.proc_handler	= proc_dointvec
764
	},
765 766 767 768 769 770 771
	{
		.procname	= "ping_group_range",
		.data		= &init_net.ipv4.sysctl_ping_group_range,
		.maxlen		= sizeof(init_net.ipv4.sysctl_ping_group_range),
		.mode		= 0644,
		.proc_handler	= ipv4_ping_group_range,
	},
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Glauber Costa 已提交
772 773 774 775 776 777
	{
		.procname	= "tcp_mem",
		.maxlen		= sizeof(init_net.ipv4.sysctl_tcp_mem),
		.mode		= 0644,
		.proc_handler	= ipv4_tcp_mem,
	},
778 779 780
	{ }
};

781 782
static __net_init int ipv4_sysctl_init_net(struct net *net)
{
783 784 785
	struct ctl_table *table;

	table = ipv4_net_table;
O
Octavian Purdila 已提交
786
	if (!net_eq(net, &init_net)) {
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
		table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
		if (table == NULL)
			goto err_alloc;

		table[0].data =
			&net->ipv4.sysctl_icmp_echo_ignore_all;
		table[1].data =
			&net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
		table[2].data =
			&net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
		table[3].data =
			&net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
		table[4].data =
			&net->ipv4.sysctl_icmp_ratelimit;
		table[5].data =
			&net->ipv4.sysctl_icmp_ratemask;
803 804
		table[6].data =
			&net->ipv4.sysctl_rt_cache_rebuild_count;
805 806 807
		table[7].data =
			&net->ipv4.sysctl_ping_group_range;

808 809
	}

810 811 812 813 814 815 816
	/*
	 * Sane defaults - nobody may create ping sockets.
	 * Boot scripts should set this to distro-specific group.
	 */
	net->ipv4.sysctl_ping_group_range[0] = 1;
	net->ipv4.sysctl_ping_group_range[1] = 0;

817 818
	net->ipv4.sysctl_rt_cache_rebuild_count = 4;

819
	tcp_init_mem(net);
G
Glauber Costa 已提交
820

821
	net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
822 823 824
	if (net->ipv4.ipv4_hdr == NULL)
		goto err_reg;

825
	return 0;
826 827

err_reg:
O
Octavian Purdila 已提交
828
	if (!net_eq(net, &init_net))
829 830 831
		kfree(table);
err_alloc:
	return -ENOMEM;
832 833 834 835
}

static __net_exit void ipv4_sysctl_exit_net(struct net *net)
{
836 837 838 839 840
	struct ctl_table *table;

	table = net->ipv4.ipv4_hdr->ctl_table_arg;
	unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
	kfree(table);
841 842 843 844 845 846 847
}

static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
	.init = ipv4_sysctl_init_net,
	.exit = ipv4_sysctl_exit_net,
};

848 849 850
static __init int sysctl_ipv4_init(void)
{
	struct ctl_table_header *hdr;
851 852 853 854 855 856 857 858 859 860
	struct ctl_table *i;

	for (i = ipv4_table; i->procname; i++) {
		if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
			i->data = sysctl_local_reserved_ports;
			break;
		}
	}
	if (!i->procname)
		return -EINVAL;
861

862
	hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
863 864 865 866
	if (hdr == NULL)
		return -ENOMEM;

	if (register_pernet_subsys(&ipv4_sysctl_ops)) {
867
		unregister_net_sysctl_table(hdr);
868 869 870 871
		return -ENOMEM;
	}

	return 0;
872 873 874
}

__initcall(sysctl_ipv4_init);