[net-next-2.6.git] / net / ipv4 / sysctl_net_ipv4.c

/*
 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
 *
 * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
 *
 * 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>
#include <linux/config.h>
#include <linux/igmp.h>
#include <linux/inetdevice.h>
#include <net/snmp.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>

/* From af_inet.c */
extern int sysctl_ip_nonlocal_bind;

#ifdef CONFIG_SYSCTL
static int zero;
static int tcp_retr1_max = 255; 
static int ip_local_port_range_min[] = { 1, 1 };
static int ip_local_port_range_max[] = { 65535, 65535 };
#endif

struct ipv4_config ipv4_config;

#ifdef CONFIG_SYSCTL

static
int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
			void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int val = ipv4_devconf.forwarding;
	int ret;

	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);

	if (write && ipv4_devconf.forwarding != val)
		inet_forward_change();

	return ret;
}

static int ipv4_sysctl_forward_strategy(ctl_table *table,
			 int __user *name, int nlen,
			 void __user *oldval, size_t __user *oldlenp,
			 void __user *newval, size_t newlen, 
			 void **context)
{
	int *valp = table->data;
	int new;

	if (!newval || !newlen)
		return 0;

	if (newlen != sizeof(int))
		return -EINVAL;

	if (get_user(new, (int __user *)newval))
		return -EFAULT;

	if (new == *valp)
		return 0;

	if (oldval && oldlenp) {
		size_t len;

		if (get_user(len, oldlenp))
			return -EFAULT;

		if (len) {
			if (len > table->maxlen)
				len = table->maxlen;
			if (copy_to_user(oldval, valp, len))
				return -EFAULT;
			if (put_user(len, oldlenp))
				return -EFAULT;
		}
	}

	*valp = new;
	inet_forward_change();
	return 1;
}

static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
				       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);

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

static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
					 int nlen, void __user *oldval,
					 size_t __user *oldlenp,
					 void __user *newval, size_t newlen,
					 void **context)
{
	char val[TCP_CA_NAME_MAX];
	ctl_table tbl = {
		.data = val,
		.maxlen = TCP_CA_NAME_MAX,
	};
	int ret;

	tcp_get_default_congestion_control(val);
	ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
			    context);
	if (ret == 0 && newval && newlen)
		ret = tcp_set_default_congestion_control(val);
	return ret;
}


ctl_table ipv4_table[] = {
        {
		.ctl_name	= NET_IPV4_TCP_TIMESTAMPS,
		.procname	= "tcp_timestamps",
		.data		= &sysctl_tcp_timestamps,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
        {
		.ctl_name	= NET_IPV4_TCP_WINDOW_SCALING,
		.procname	= "tcp_window_scaling",
		.data		= &sysctl_tcp_window_scaling,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
        {
		.ctl_name	= NET_IPV4_TCP_SACK,
		.procname	= "tcp_sack",
		.data		= &sysctl_tcp_sack,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
        {
		.ctl_name	= NET_IPV4_TCP_RETRANS_COLLAPSE,
		.procname	= "tcp_retrans_collapse",
		.data		= &sysctl_tcp_retrans_collapse,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
        {
		.ctl_name	= NET_IPV4_FORWARD,
		.procname	= "ip_forward",
		.data		= &ipv4_devconf.forwarding,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &ipv4_sysctl_forward,
		.strategy	= &ipv4_sysctl_forward_strategy
	},
        {
		.ctl_name	= NET_IPV4_DEFAULT_TTL,
		.procname	= "ip_default_ttl",
 		.data		= &sysctl_ip_default_ttl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &ipv4_doint_and_flush,
		.strategy	= &ipv4_doint_and_flush_strategy,
	},
        {
		.ctl_name	= NET_IPV4_AUTOCONFIG,
		.procname	= "ip_autoconfig",
		.data		= &ipv4_config.autoconfig,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
        {
		.ctl_name	= NET_IPV4_NO_PMTU_DISC,
		.procname	= "ip_no_pmtu_disc",
		.data		= &ipv4_config.no_pmtu_disc,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_NONLOCAL_BIND,
		.procname	= "ip_nonlocal_bind",
		.data		= &sysctl_ip_nonlocal_bind,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_TCP_SYN_RETRIES,
		.procname	= "tcp_syn_retries",
		.data		= &sysctl_tcp_syn_retries,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_SYNACK_RETRIES,
		.procname	= "tcp_synack_retries",
		.data		= &sysctl_tcp_synack_retries,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_MAX_ORPHANS,
		.procname	= "tcp_max_orphans",
		.data		= &sysctl_tcp_max_orphans,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_MAX_TW_BUCKETS,
		.procname	= "tcp_max_tw_buckets",
		.data		= &tcp_death_row.sysctl_max_tw_buckets,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_IPFRAG_HIGH_THRESH,
		.procname	= "ipfrag_high_thresh",
		.data		= &sysctl_ipfrag_high_thresh,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_IPFRAG_LOW_THRESH,
		.procname	= "ipfrag_low_thresh",
		.data		= &sysctl_ipfrag_low_thresh,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_DYNADDR,
		.procname	= "ip_dynaddr",
		.data		= &sysctl_ip_dynaddr,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_IPFRAG_TIME,
		.procname	= "ipfrag_time",
		.data		= &sysctl_ipfrag_time,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_TIME,
		.procname	= "tcp_keepalive_time",
		.data		= &sysctl_tcp_keepalive_time,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_PROBES,
		.procname	= "tcp_keepalive_probes",
		.data		= &sysctl_tcp_keepalive_probes,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_TCP_KEEPALIVE_INTVL,
		.procname	= "tcp_keepalive_intvl",
		.data		= &sysctl_tcp_keepalive_intvl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_TCP_RETRIES1,
		.procname	= "tcp_retries1",
		.data		= &sysctl_tcp_retries1,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra2		= &tcp_retr1_max
	},
	{
		.ctl_name	= NET_IPV4_TCP_RETRIES2,
		.procname	= "tcp_retries2",
		.data		= &sysctl_tcp_retries2,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_TCP_FIN_TIMEOUT,
		.procname	= "tcp_fin_timeout",
		.data		= &sysctl_tcp_fin_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
#ifdef CONFIG_SYN_COOKIES
	{
		.ctl_name	= NET_TCP_SYNCOOKIES,
		.procname	= "tcp_syncookies",
		.data		= &sysctl_tcp_syncookies,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
#endif
	{
		.ctl_name	= NET_TCP_TW_RECYCLE,
		.procname	= "tcp_tw_recycle",
		.data		= &tcp_death_row.sysctl_tw_recycle,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_ABORT_ON_OVERFLOW,
		.procname	= "tcp_abort_on_overflow",
		.data		= &sysctl_tcp_abort_on_overflow,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_STDURG,
		.procname	= "tcp_stdurg",
		.data		= &sysctl_tcp_stdurg,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_RFC1337,
		.procname	= "tcp_rfc1337",
		.data		= &sysctl_tcp_rfc1337,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_MAX_SYN_BACKLOG,
		.procname	= "tcp_max_syn_backlog",
		.data		= &sysctl_max_syn_backlog,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_LOCAL_PORT_RANGE,
		.procname	= "ip_local_port_range",
		.data		= &sysctl_local_port_range,
		.maxlen		= sizeof(sysctl_local_port_range),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.strategy	= &sysctl_intvec,
		.extra1		= ip_local_port_range_min,
		.extra2		= ip_local_port_range_max
	},
	{
		.ctl_name	= NET_IPV4_ICMP_ECHO_IGNORE_ALL,
		.procname	= "icmp_echo_ignore_all",
		.data		= &sysctl_icmp_echo_ignore_all,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
		.procname	= "icmp_echo_ignore_broadcasts",
		.data		= &sysctl_icmp_echo_ignore_broadcasts,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
		.procname	= "icmp_ignore_bogus_error_responses",
		.data		= &sysctl_icmp_ignore_bogus_error_responses,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
		.procname	= "icmp_errors_use_inbound_ifaddr",
		.data		= &sysctl_icmp_errors_use_inbound_ifaddr,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_ROUTE,
		.procname	= "route",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= ipv4_route_table
	},
#ifdef CONFIG_IP_MULTICAST
	{
		.ctl_name	= NET_IPV4_IGMP_MAX_MEMBERSHIPS,
		.procname	= "igmp_max_memberships",
		.data		= &sysctl_igmp_max_memberships,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},

#endif
	{
		.ctl_name	= NET_IPV4_IGMP_MAX_MSF,
		.procname	= "igmp_max_msf",
		.data		= &sysctl_igmp_max_msf,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_INET_PEER_THRESHOLD,
		.procname	= "inet_peer_threshold",
		.data		= &inet_peer_threshold,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_INET_PEER_MINTTL,
		.procname	= "inet_peer_minttl",
		.data		= &inet_peer_minttl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_INET_PEER_MAXTTL,
		.procname	= "inet_peer_maxttl",
		.data		= &inet_peer_maxttl,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_INET_PEER_GC_MINTIME,
		.procname	= "inet_peer_gc_mintime",
		.data		= &inet_peer_gc_mintime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_INET_PEER_GC_MAXTIME,
		.procname	= "inet_peer_gc_maxtime",
		.data		= &inet_peer_gc_maxtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_TCP_ORPHAN_RETRIES,
		.procname	= "tcp_orphan_retries",
		.data		= &sysctl_tcp_orphan_retries,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_FACK,
		.procname	= "tcp_fack",
		.data		= &sysctl_tcp_fack,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_REORDERING,
		.procname	= "tcp_reordering",
		.data		= &sysctl_tcp_reordering,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_ECN,
		.procname	= "tcp_ecn",
		.data		= &sysctl_tcp_ecn,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_DSACK,
		.procname	= "tcp_dsack",
		.data		= &sysctl_tcp_dsack,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_MEM,
		.procname	= "tcp_mem",
		.data		= &sysctl_tcp_mem,
		.maxlen		= sizeof(sysctl_tcp_mem),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_WMEM,
		.procname	= "tcp_wmem",
		.data		= &sysctl_tcp_wmem,
		.maxlen		= sizeof(sysctl_tcp_wmem),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_RMEM,
		.procname	= "tcp_rmem",
		.data		= &sysctl_tcp_rmem,
		.maxlen		= sizeof(sysctl_tcp_rmem),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_APP_WIN,
		.procname	= "tcp_app_win",
		.data		= &sysctl_tcp_app_win,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_ADV_WIN_SCALE,
		.procname	= "tcp_adv_win_scale",
		.data		= &sysctl_tcp_adv_win_scale,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_ICMP_RATELIMIT,
		.procname	= "icmp_ratelimit",
		.data		= &sysctl_icmp_ratelimit,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_ICMP_RATEMASK,
		.procname	= "icmp_ratemask",
		.data		= &sysctl_icmp_ratemask,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_TW_REUSE,
		.procname	= "tcp_tw_reuse",
		.data		= &sysctl_tcp_tw_reuse,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_FRTO,
		.procname	= "tcp_frto",
		.data		= &sysctl_tcp_frto,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_TCP_LOW_LATENCY,
		.procname	= "tcp_low_latency",
		.data		= &sysctl_tcp_low_latency,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{
		.ctl_name	= NET_IPV4_IPFRAG_SECRET_INTERVAL,
		.procname	= "ipfrag_secret_interval",
		.data		= &sysctl_ipfrag_secret_interval,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
		.strategy	= &sysctl_jiffies
	},
	{
		.ctl_name	= NET_IPV4_IPFRAG_MAX_DIST,
		.procname	= "ipfrag_max_dist",
		.data		= &sysctl_ipfrag_max_dist,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_minmax,
		.extra1		= &zero
	},
	{
		.ctl_name	= NET_TCP_NO_METRICS_SAVE,
		.procname	= "tcp_no_metrics_save",
		.data		= &sysctl_tcp_nometrics_save,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= NET_TCP_MODERATE_RCVBUF,
		.procname	= "tcp_moderate_rcvbuf",
		.data		= &sysctl_tcp_moderate_rcvbuf,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= NET_TCP_TSO_WIN_DIVISOR,
		.procname	= "tcp_tso_win_divisor",
		.data		= &sysctl_tcp_tso_win_divisor,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= NET_TCP_CONG_CONTROL,
		.procname	= "tcp_congestion_control",
		.mode		= 0644,
		.maxlen		= TCP_CA_NAME_MAX,
		.proc_handler	= &proc_tcp_congestion_control,
		.strategy	= &sysctl_tcp_congestion_control,
	},
	{
		.ctl_name	= NET_TCP_ABC,
		.procname	= "tcp_abc",
		.data		= &sysctl_tcp_abc,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= NET_TCP_MTU_PROBING,
		.procname	= "tcp_mtu_probing",
		.data		= &sysctl_tcp_mtu_probing,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= NET_TCP_BASE_MSS,
		.procname	= "tcp_base_mss",
		.data		= &sysctl_tcp_base_mss,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
        {
		.ctl_name	= NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
		.procname	= "tcp_workaround_signed_windows",
		.data		= &sysctl_tcp_workaround_signed_windows,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec
	},
	{ .ctl_name = 0 }
};

#endif /* CONFIG_SYSCTL */

EXPORT_SYMBOL(ipv4_config);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
	3	*
	4	* $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
	5	*
	6	* Begun April 1, 1996, Mike Shaver.
	7	* Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
	8	*/
	9
	10	#include <linux/mm.h>
	11	#include <linux/module.h>
	12	#include <linux/sysctl.h>
	13	#include <linux/config.h>
20380731	14	#include <linux/igmp.h>
14c85021	15	#include <linux/inetdevice.h>
1da177e4	16	#include <net/snmp.h>
20380731	17	#include <net/icmp.h>
1da177e4 LT	18	#include <net/ip.h>
	19	#include <net/route.h>
	20	#include <net/tcp.h>
	21
	22	/* From af_inet.c */
	23	extern int sysctl_ip_nonlocal_bind;
	24
1da177e4	25	#ifdef CONFIG_SYSCTL
89cee8b1	26	static int zero;
1da177e4 LT	27	static int tcp_retr1_max = 255;
	28	static int ip_local_port_range_min[] = { 1, 1 };
	29	static int ip_local_port_range_max[] = { 65535, 65535 };
	30	#endif
	31
	32	struct ipv4_config ipv4_config;
	33
1da177e4 LT	34	#ifdef CONFIG_SYSCTL
	35
	36	static
	37	int ipv4_sysctl_forward(ctl_table ctl, int write, struct file filp,
	38	void __user buffer, size_t lenp, loff_t *ppos)
	39	{
	40	int val = ipv4_devconf.forwarding;
	41	int ret;
	42
	43	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
	44
	45	if (write && ipv4_devconf.forwarding != val)
	46	inet_forward_change();
	47
	48	return ret;
	49	}
	50
	51	static int ipv4_sysctl_forward_strategy(ctl_table *table,
	52	int __user *name, int nlen,
	53	void __user oldval, size_t __user oldlenp,
	54	void __user *newval, size_t newlen,
	55	void **context)
	56	{
	57	int *valp = table->data;
	58	int new;
	59
	60	if (!newval \|\| !newlen)
	61	return 0;
	62
	63	if (newlen != sizeof(int))
	64	return -EINVAL;
	65
	66	if (get_user(new, (int __user *)newval))
	67	return -EFAULT;
	68
	69	if (new == *valp)
	70	return 0;
	71
	72	if (oldval && oldlenp) {
	73	size_t len;
	74
	75	if (get_user(len, oldlenp))
	76	return -EFAULT;
	77
	78	if (len) {
	79	if (len > table->maxlen)
	80	len = table->maxlen;
	81	if (copy_to_user(oldval, valp, len))
	82	return -EFAULT;
	83	if (put_user(len, oldlenp))
	84	return -EFAULT;
	85	}
	86	}
	87
	88	*valp = new;
	89	inet_forward_change();
	90	return 1;
	91	}
	92
317a76f9 SH	93	static int proc_tcp_congestion_control(ctl_table ctl, int write, struct file filp,
	94	void __user buffer, size_t lenp, loff_t *ppos)
	95	{
	96	char val[TCP_CA_NAME_MAX];
	97	ctl_table tbl = {
	98	.data = val,
	99	.maxlen = TCP_CA_NAME_MAX,
	100	};
	101	int ret;
	102
	103	tcp_get_default_congestion_control(val);
	104
	105	ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
	106	if (write && ret == 0)
	107	ret = tcp_set_default_congestion_control(val);
	108	return ret;
	109	}
	110
20380731 ACM	111	static int sysctl_tcp_congestion_control(ctl_table table, int __user name,
	112	int nlen, void __user *oldval,
	113	size_t __user *oldlenp,
	114	void __user *newval, size_t newlen,
	115	void **context)
317a76f9 SH	116	{
	117	char val[TCP_CA_NAME_MAX];
	118	ctl_table tbl = {
	119	.data = val,
	120	.maxlen = TCP_CA_NAME_MAX,
	121	};
	122	int ret;
	123
	124	tcp_get_default_congestion_control(val);
	125	ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
	126	context);
	127	if (ret == 0 && newval && newlen)
	128	ret = tcp_set_default_congestion_control(val);
	129	return ret;
	130	}
	131
	132
1da177e4 LT	133	ctl_table ipv4_table[] = {
	134	{
	135	.ctl_name = NET_IPV4_TCP_TIMESTAMPS,
	136	.procname = "tcp_timestamps",
	137	.data = &sysctl_tcp_timestamps,
	138	.maxlen = sizeof(int),
	139	.mode = 0644,
	140	.proc_handler = &proc_dointvec
	141	},
	142	{
	143	.ctl_name = NET_IPV4_TCP_WINDOW_SCALING,
	144	.procname = "tcp_window_scaling",
	145	.data = &sysctl_tcp_window_scaling,
	146	.maxlen = sizeof(int),
	147	.mode = 0644,
	148	.proc_handler = &proc_dointvec
	149	},
	150	{
	151	.ctl_name = NET_IPV4_TCP_SACK,
	152	.procname = "tcp_sack",
	153	.data = &sysctl_tcp_sack,
	154	.maxlen = sizeof(int),
	155	.mode = 0644,
	156	.proc_handler = &proc_dointvec
	157	},
	158	{
	159	.ctl_name = NET_IPV4_TCP_RETRANS_COLLAPSE,
	160	.procname = "tcp_retrans_collapse",
	161	.data = &sysctl_tcp_retrans_collapse,
	162	.maxlen = sizeof(int),
	163	.mode = 0644,
	164	.proc_handler = &proc_dointvec
	165	},
	166	{
	167	.ctl_name = NET_IPV4_FORWARD,
	168	.procname = "ip_forward",
	169	.data = &ipv4_devconf.forwarding,
	170	.maxlen = sizeof(int),
	171	.mode = 0644,
	172	.proc_handler = &ipv4_sysctl_forward,
	173	.strategy = &ipv4_sysctl_forward_strategy
	174	},
	175	{
	176	.ctl_name = NET_IPV4_DEFAULT_TTL,
	177	.procname = "ip_default_ttl",
	178	.data = &sysctl_ip_default_ttl,
	179	.maxlen = sizeof(int),
	180	.mode = 0644,
	181	.proc_handler = &ipv4_doint_and_flush,
	182	.strategy = &ipv4_doint_and_flush_strategy,
	183	},
	184	{
	185	.ctl_name = NET_IPV4_AUTOCONFIG,
	186	.procname = "ip_autoconfig",
	187	.data = &ipv4_config.autoconfig,
	188	.maxlen = sizeof(int),
	189	.mode = 0644,
	190	.proc_handler = &proc_dointvec
	191	},
	192	{
	193	.ctl_name = NET_IPV4_NO_PMTU_DISC,
	194	.procname = "ip_no_pmtu_disc",
	195	.data = &ipv4_config.no_pmtu_disc,
	196	.maxlen = sizeof(int),
197	.mode = 0644,
198	.proc_handler = &proc_dointvec
199	},
200	{
201	.ctl_name = NET_IPV4_NONLOCAL_BIND,
202	.procname = "ip_nonlocal_bind",
203	.data = &sysctl_ip_nonlocal_bind,
204	.maxlen = sizeof(int),
205	.mode = 0644,
206	.proc_handler = &proc_dointvec
207	},
208	{
209	.ctl_name = NET_IPV4_TCP_SYN_RETRIES,
210	.procname = "tcp_syn_retries",
211	.data = &sysctl_tcp_syn_retries,
212	.maxlen = sizeof(int),
213	.mode = 0644,
214	.proc_handler = &proc_dointvec
215	},
216	{
217	.ctl_name = NET_TCP_SYNACK_RETRIES,
218	.procname = "tcp_synack_retries",
219	.data = &sysctl_tcp_synack_retries,
220	.maxlen = sizeof(int),
221	.mode = 0644,
222	.proc_handler = &proc_dointvec
223	},
224	{
225	.ctl_name = NET_TCP_MAX_ORPHANS,
226	.procname = "tcp_max_orphans",
227	.data = &sysctl_tcp_max_orphans,
228	.maxlen = sizeof(int),
229	.mode = 0644,
230	.proc_handler = &proc_dointvec
231	},
232	{
233	.ctl_name = NET_TCP_MAX_TW_BUCKETS,
234	.procname = "tcp_max_tw_buckets",
295ff7ed	235	.data = &tcp_death_row.sysctl_max_tw_buckets,
1da177e4 LT	236	.maxlen = sizeof(int),
	237	.mode = 0644,
	238	.proc_handler = &proc_dointvec
	239	},
	240	{
	241	.ctl_name = NET_IPV4_IPFRAG_HIGH_THRESH,
	242	.procname = "ipfrag_high_thresh",
	243	.data = &sysctl_ipfrag_high_thresh,
	244	.maxlen = sizeof(int),
	245	.mode = 0644,
	246	.proc_handler = &proc_dointvec
	247	},
	248	{
	249	.ctl_name = NET_IPV4_IPFRAG_LOW_THRESH,
	250	.procname = "ipfrag_low_thresh",
	251	.data = &sysctl_ipfrag_low_thresh,
	252	.maxlen = sizeof(int),
	253	.mode = 0644,
	254	.proc_handler = &proc_dointvec
	255	},
	256	{
	257	.ctl_name = NET_IPV4_DYNADDR,
	258	.procname = "ip_dynaddr",
	259	.data = &sysctl_ip_dynaddr,
	260	.maxlen = sizeof(int),
	261	.mode = 0644,
	262	.proc_handler = &proc_dointvec
	263	},
	264	{
	265	.ctl_name = NET_IPV4_IPFRAG_TIME,
	266	.procname = "ipfrag_time",
	267	.data = &sysctl_ipfrag_time,
	268	.maxlen = sizeof(int),
	269	.mode = 0644,
	270	.proc_handler = &proc_dointvec_jiffies,
	271	.strategy = &sysctl_jiffies
	272	},
	273	{
	274	.ctl_name = NET_IPV4_TCP_KEEPALIVE_TIME,
	275	.procname = "tcp_keepalive_time",
	276	.data = &sysctl_tcp_keepalive_time,
	277	.maxlen = sizeof(int),
	278	.mode = 0644,
	279	.proc_handler = &proc_dointvec_jiffies,
	280	.strategy = &sysctl_jiffies
	281	},
	282	{
	283	.ctl_name = NET_IPV4_TCP_KEEPALIVE_PROBES,
	284	.procname = "tcp_keepalive_probes",
	285	.data = &sysctl_tcp_keepalive_probes,
	286	.maxlen = sizeof(int),
	287	.mode = 0644,
	288	.proc_handler = &proc_dointvec
	289	},
	290	{
	291	.ctl_name = NET_IPV4_TCP_KEEPALIVE_INTVL,
	292	.procname = "tcp_keepalive_intvl",
	293	.data = &sysctl_tcp_keepalive_intvl,
	294	.maxlen = sizeof(int),
	295	.mode = 0644,
	296	.proc_handler = &proc_dointvec_jiffies,
	297	.strategy = &sysctl_jiffies
	298	},
	299	{
300	.ctl_name = NET_IPV4_TCP_RETRIES1,
301	.procname = "tcp_retries1",
302	.data = &sysctl_tcp_retries1,
303	.maxlen = sizeof(int),
304	.mode = 0644,
305	.proc_handler = &proc_dointvec_minmax,
306	.strategy = &sysctl_intvec,
307	.extra2 = &tcp_retr1_max
308	},
309	{
310	.ctl_name = NET_IPV4_TCP_RETRIES2,
311	.procname = "tcp_retries2",
312	.data = &sysctl_tcp_retries2,
313	.maxlen = sizeof(int),
314	.mode = 0644,
315	.proc_handler = &proc_dointvec
316	},
317	{
318	.ctl_name = NET_IPV4_TCP_FIN_TIMEOUT,
319	.procname = "tcp_fin_timeout",
320	.data = &sysctl_tcp_fin_timeout,
321	.maxlen = sizeof(int),
322	.mode = 0644,
323	.proc_handler = &proc_dointvec_jiffies,
324	.strategy = &sysctl_jiffies
325	},
326	#ifdef CONFIG_SYN_COOKIES
327	{
328	.ctl_name = NET_TCP_SYNCOOKIES,
329	.procname = "tcp_syncookies",
330	.data = &sysctl_tcp_syncookies,
331	.maxlen = sizeof(int),
332	.mode = 0644,
333	.proc_handler = &proc_dointvec
334	},
335	#endif
336	{
337	.ctl_name = NET_TCP_TW_RECYCLE,
338	.procname = "tcp_tw_recycle",
295ff7ed	339	.data = &tcp_death_row.sysctl_tw_recycle,
1da177e4 LT	340	.maxlen = sizeof(int),
	341	.mode = 0644,
	342	.proc_handler = &proc_dointvec
	343	},
	344	{
	345	.ctl_name = NET_TCP_ABORT_ON_OVERFLOW,
	346	.procname = "tcp_abort_on_overflow",
	347	.data = &sysctl_tcp_abort_on_overflow,
	348	.maxlen = sizeof(int),
	349	.mode = 0644,
	350	.proc_handler = &proc_dointvec
	351	},
	352	{
	353	.ctl_name = NET_TCP_STDURG,
	354	.procname = "tcp_stdurg",
	355	.data = &sysctl_tcp_stdurg,
	356	.maxlen = sizeof(int),
	357	.mode = 0644,
	358	.proc_handler = &proc_dointvec
	359	},
	360	{
	361	.ctl_name = NET_TCP_RFC1337,
	362	.procname = "tcp_rfc1337",
	363	.data = &sysctl_tcp_rfc1337,
	364	.maxlen = sizeof(int),
	365	.mode = 0644,
	366	.proc_handler = &proc_dointvec
	367	},
	368	{
	369	.ctl_name = NET_TCP_MAX_SYN_BACKLOG,
	370	.procname = "tcp_max_syn_backlog",
	371	.data = &sysctl_max_syn_backlog,
	372	.maxlen = sizeof(int),
	373	.mode = 0644,
	374	.proc_handler = &proc_dointvec
	375	},
	376	{
	377	.ctl_name = NET_IPV4_LOCAL_PORT_RANGE,
	378	.procname = "ip_local_port_range",
	379	.data = &sysctl_local_port_range,
	380	.maxlen = sizeof(sysctl_local_port_range),
	381	.mode = 0644,
	382	.proc_handler = &proc_dointvec_minmax,
	383	.strategy = &sysctl_intvec,
	384	.extra1 = ip_local_port_range_min,
	385	.extra2 = ip_local_port_range_max
	386	},
	387	{
	388	.ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
	389	.procname = "icmp_echo_ignore_all",
	390	.data = &sysctl_icmp_echo_ignore_all,
	391	.maxlen = sizeof(int),
	392	.mode = 0644,
	393	.proc_handler = &proc_dointvec
	394	},
	395	{
	396	.ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
	397	.procname = "icmp_echo_ignore_broadcasts",
	398	.data = &sysctl_icmp_echo_ignore_broadcasts,
	399	.maxlen = sizeof(int),
	400	.mode = 0644,
	401	.proc_handler = &proc_dointvec
	402	},
	403	{
404	.ctl_name = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
405	.procname = "icmp_ignore_bogus_error_responses",
406	.data = &sysctl_icmp_ignore_bogus_error_responses,
407	.maxlen = sizeof(int),
408	.mode = 0644,
409	.proc_handler = &proc_dointvec
410	},
1c2fb7f9 S	411	{
	412	.ctl_name = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
	413	.procname = "icmp_errors_use_inbound_ifaddr",
	414	.data = &sysctl_icmp_errors_use_inbound_ifaddr,
	415	.maxlen = sizeof(int),
	416	.mode = 0644,
	417	.proc_handler = &proc_dointvec
	418	},
1da177e4 LT	419	{
	420	.ctl_name = NET_IPV4_ROUTE,
	421	.procname = "route",
	422	.maxlen = 0,
	423	.mode = 0555,
	424	.child = ipv4_route_table
	425	},
	426	#ifdef CONFIG_IP_MULTICAST
	427	{
	428	.ctl_name = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
	429	.procname = "igmp_max_memberships",
	430	.data = &sysctl_igmp_max_memberships,
	431	.maxlen = sizeof(int),
	432	.mode = 0644,
	433	.proc_handler = &proc_dointvec
	434	},
	435
	436	#endif
	437	{
	438	.ctl_name = NET_IPV4_IGMP_MAX_MSF,
	439	.procname = "igmp_max_msf",
	440	.data = &sysctl_igmp_max_msf,
	441	.maxlen = sizeof(int),
	442	.mode = 0644,
	443	.proc_handler = &proc_dointvec
	444	},
	445	{
	446	.ctl_name = NET_IPV4_INET_PEER_THRESHOLD,
	447	.procname = "inet_peer_threshold",
	448	.data = &inet_peer_threshold,
	449	.maxlen = sizeof(int),
	450	.mode = 0644,
	451	.proc_handler = &proc_dointvec
	452	},
	453	{
	454	.ctl_name = NET_IPV4_INET_PEER_MINTTL,
	455	.procname = "inet_peer_minttl",
	456	.data = &inet_peer_minttl,
	457	.maxlen = sizeof(int),
	458	.mode = 0644,
	459	.proc_handler = &proc_dointvec_jiffies,
	460	.strategy = &sysctl_jiffies
	461	},
	462	{
	463	.ctl_name = NET_IPV4_INET_PEER_MAXTTL,
	464	.procname = "inet_peer_maxttl",
	465	.data = &inet_peer_maxttl,
	466	.maxlen = sizeof(int),
	467	.mode = 0644,
	468	.proc_handler = &proc_dointvec_jiffies,
	469	.strategy = &sysctl_jiffies
	470	},
	471	{
	472	.ctl_name = NET_IPV4_INET_PEER_GC_MINTIME,
	473	.procname = "inet_peer_gc_mintime",
	474	.data = &inet_peer_gc_mintime,
	475	.maxlen = sizeof(int),
	476	.mode = 0644,
	477	.proc_handler = &proc_dointvec_jiffies,
	478	.strategy = &sysctl_jiffies
	479	},
	480	{
	481	.ctl_name = NET_IPV4_INET_PEER_GC_MAXTIME,
	482	.procname = "inet_peer_gc_maxtime",
483	.data = &inet_peer_gc_maxtime,
484	.maxlen = sizeof(int),
485	.mode = 0644,
486	.proc_handler = &proc_dointvec_jiffies,
487	.strategy = &sysctl_jiffies
488	},
489	{
490	.ctl_name = NET_TCP_ORPHAN_RETRIES,
491	.procname = "tcp_orphan_retries",
492	.data = &sysctl_tcp_orphan_retries,
493	.maxlen = sizeof(int),
494	.mode = 0644,
495	.proc_handler = &proc_dointvec
496	},
497	{
498	.ctl_name = NET_TCP_FACK,
499	.procname = "tcp_fack",
500	.data = &sysctl_tcp_fack,
501	.maxlen = sizeof(int),
502	.mode = 0644,
503	.proc_handler = &proc_dointvec
504	},
505	{
506	.ctl_name = NET_TCP_REORDERING,
507	.procname = "tcp_reordering",
508	.data = &sysctl_tcp_reordering,
509	.maxlen = sizeof(int),
510	.mode = 0644,
511	.proc_handler = &proc_dointvec
512	},
513	{
514	.ctl_name = NET_TCP_ECN,
515	.procname = "tcp_ecn",
516	.data = &sysctl_tcp_ecn,
517	.maxlen = sizeof(int),
518	.mode = 0644,
519	.proc_handler = &proc_dointvec
520	},
521	{
522	.ctl_name = NET_TCP_DSACK,
523	.procname = "tcp_dsack",
524	.data = &sysctl_tcp_dsack,
525	.maxlen = sizeof(int),
526	.mode = 0644,
527	.proc_handler = &proc_dointvec
528	},
529	{
530	.ctl_name = NET_TCP_MEM,
531	.procname = "tcp_mem",
532	.data = &sysctl_tcp_mem,
533	.maxlen = sizeof(sysctl_tcp_mem),
534	.mode = 0644,
535	.proc_handler = &proc_dointvec
536	},
537	{
538	.ctl_name = NET_TCP_WMEM,
539	.procname = "tcp_wmem",
540	.data = &sysctl_tcp_wmem,
541	.maxlen = sizeof(sysctl_tcp_wmem),
542	.mode = 0644,
543	.proc_handler = &proc_dointvec
544	},
545	{
546	.ctl_name = NET_TCP_RMEM,
547	.procname = "tcp_rmem",
548	.data = &sysctl_tcp_rmem,
549	.maxlen = sizeof(sysctl_tcp_rmem),
550	.mode = 0644,
551	.proc_handler = &proc_dointvec
552	},
553	{
554	.ctl_name = NET_TCP_APP_WIN,
555	.procname = "tcp_app_win",
556	.data = &sysctl_tcp_app_win,
557	.maxlen = sizeof(int),
558	.mode = 0644,
559	.proc_handler = &proc_dointvec
560	},
561	{
562	.ctl_name = NET_TCP_ADV_WIN_SCALE,
563	.procname = "tcp_adv_win_scale",
564	.data = &sysctl_tcp_adv_win_scale,
565	.maxlen = sizeof(int),
566	.mode = 0644,
567	.proc_handler = &proc_dointvec
568	},
569	{
570	.ctl_name = NET_IPV4_ICMP_RATELIMIT,
571	.procname = "icmp_ratelimit",
572	.data = &sysctl_icmp_ratelimit,
573	.maxlen = sizeof(int),
574	.mode = 0644,
575	.proc_handler = &proc_dointvec
576	},
577	{
578	.ctl_name = NET_IPV4_ICMP_RATEMASK,
579	.procname = "icmp_ratemask",
580	.data = &sysctl_icmp_ratemask,
581	.maxlen = sizeof(int),
582	.mode = 0644,
583	.proc_handler = &proc_dointvec
584	},
585	{
586	.ctl_name = NET_TCP_TW_REUSE,
587	.procname = "tcp_tw_reuse",
588	.data = &sysctl_tcp_tw_reuse,
589	.maxlen = sizeof(int),
590	.mode = 0644,
591	.proc_handler = &proc_dointvec
592	},
593	{
594	.ctl_name = NET_TCP_FRTO,
595	.procname = "tcp_frto",
596	.data = &sysctl_tcp_frto,
597	.maxlen = sizeof(int),
598	.mode = 0644,
599	.proc_handler = &proc_dointvec
600	},
601	{
602	.ctl_name = NET_TCP_LOW_LATENCY,
603	.procname = "tcp_low_latency",
604	.data = &sysctl_tcp_low_latency,
605	.maxlen = sizeof(int),
606	.mode = 0644,
607	.proc_handler = &proc_dointvec
608	},
609	{
610	.ctl_name = NET_IPV4_IPFRAG_SECRET_INTERVAL,
611	.procname = "ipfrag_secret_interval",
612	.data = &sysctl_ipfrag_secret_interval,
613	.maxlen = sizeof(int),
614	.mode = 0644,
615	.proc_handler = &proc_dointvec_jiffies,
616	.strategy = &sysctl_jiffies
617	},
89cee8b1 HX	618	{
	619	.ctl_name = NET_IPV4_IPFRAG_MAX_DIST,
	620	.procname = "ipfrag_max_dist",
	621	.data = &sysctl_ipfrag_max_dist,
	622	.maxlen = sizeof(int),
	623	.mode = 0644,
	624	.proc_handler = &proc_dointvec_minmax,
	625	.extra1 = &zero
	626	},
1da177e4 LT	627	{
	628	.ctl_name = NET_TCP_NO_METRICS_SAVE,
	629	.procname = "tcp_no_metrics_save",
	630	.data = &sysctl_tcp_nometrics_save,
	631	.maxlen = sizeof(int),
	632	.mode = 0644,
	633	.proc_handler = &proc_dointvec,
	634	},
1da177e4 LT	635	{
	636	.ctl_name = NET_TCP_MODERATE_RCVBUF,
	637	.procname = "tcp_moderate_rcvbuf",
	638	.data = &sysctl_tcp_moderate_rcvbuf,
	639	.maxlen = sizeof(int),
	640	.mode = 0644,
	641	.proc_handler = &proc_dointvec,
	642	},
	643	{
	644	.ctl_name = NET_TCP_TSO_WIN_DIVISOR,
	645	.procname = "tcp_tso_win_divisor",
	646	.data = &sysctl_tcp_tso_win_divisor,
	647	.maxlen = sizeof(int),
	648	.mode = 0644,
	649	.proc_handler = &proc_dointvec,
	650	},
	651	{
317a76f9 SH	652	.ctl_name = NET_TCP_CONG_CONTROL,
317a76f9 SH	653	.procname = "tcp_congestion_control",
1da177e4	654	.mode = 0644,
317a76f9 SH	655	.maxlen = TCP_CA_NAME_MAX,
	656	.proc_handler = &proc_tcp_congestion_control,
	657	.strategy = &sysctl_tcp_congestion_control,
1da177e4	658	},
9772efb9 SH	659	{
	660	.ctl_name = NET_TCP_ABC,
	661	.procname = "tcp_abc",
	662	.data = &sysctl_tcp_abc,
	663	.maxlen = sizeof(int),
	664	.mode = 0644,
	665	.proc_handler = &proc_dointvec,
	666	},
5d424d5a JH	667	{
	668	.ctl_name = NET_TCP_MTU_PROBING,
	669	.procname = "tcp_mtu_probing",
	670	.data = &sysctl_tcp_mtu_probing,
	671	.maxlen = sizeof(int),
	672	.mode = 0644,
	673	.proc_handler = &proc_dointvec,
	674	},
	675	{
	676	.ctl_name = NET_TCP_BASE_MSS,
	677	.procname = "tcp_base_mss",
	678	.data = &sysctl_tcp_base_mss,
	679	.maxlen = sizeof(int),
	680	.mode = 0644,
	681	.proc_handler = &proc_dointvec,
	682	},
15d99e02 RJ	683	{
	684	.ctl_name = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
	685	.procname = "tcp_workaround_signed_windows",
	686	.data = &sysctl_tcp_workaround_signed_windows,
	687	.maxlen = sizeof(int),
	688	.mode = 0644,
	689	.proc_handler = &proc_dointvec
	690	},
1da177e4 LT	691	{ .ctl_name = 0 }
	692	};
	693
	694	#endif /* CONFIG_SYSCTL */
	695
	696	EXPORT_SYMBOL(ipv4_config);