sysctl_net_ipv4.c

Linux Kernel 2.6.9 for OMAP1710

/*
 * 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 <net/snmp.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp.h>

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

/* From icmp.c */
extern int sysctl_icmp_echo_ignore_all;
extern int sysctl_icmp_echo_ignore_broadcasts;
extern int sysctl_icmp_ignore_bogus_error_responses;

/* From ip_fragment.c */
extern int sysctl_ipfrag_low_thresh;
extern int sysctl_ipfrag_high_thresh; 
extern int sysctl_ipfrag_time;
extern int sysctl_ipfrag_secret_interval;

/* From ip_output.c */
extern int sysctl_ip_dynaddr;

/* From icmp.c */
extern int sysctl_icmp_ratelimit;
extern int sysctl_icmp_ratemask;

/* From igmp.c */
extern int sysctl_igmp_max_memberships;
extern int sysctl_igmp_max_msf;

/* From inetpeer.c */
extern int inet_peer_threshold;
extern int inet_peer_minttl;
extern int inet_peer_maxttl;
extern int inet_peer_gc_mintime;
extern int inet_peer_gc_maxtime;

#ifdef CONFIG_SYSCTL
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;

extern ctl_table ipv4_route_table[];

#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;
}

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		= &sysctl_tcp_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		= &sysctl_tcp_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
	},