/*
 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
 *
 * $Id: sysctl_net_ipv4.c,v 1.41 2000/01/06 00:42:03 davem Exp $
 *
 * Begun April 1, 1996, Mike Shaver.
 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
 */

#include <linux/mm.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>

/*
 *	TCP configuration parameters
 */

#define TCP_PMTU_DISC	0x00000001	/* perform PMTU discovery	  */
#define TCP_CONG_AVOID	0x00000002	/* congestion avoidance algorithm */
#define TCP_DELAY_ACKS	0x00000003	/* delayed ack stategy		  */

#if 0
static int boolean_min = 0;
static int boolean_max = 1;
#endif

/* 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;

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

/* From ip_masq.c */
extern int sysctl_ip_masq_debug;

extern int sysctl_tcp_timestamps;
extern int sysctl_tcp_window_scaling;
extern int sysctl_tcp_sack;
extern int sysctl_tcp_retrans_collapse;
extern int sysctl_tcp_keepalive_time;
extern int sysctl_tcp_keepalive_probes;
extern int sysctl_tcp_retries1;
extern int sysctl_tcp_retries2;
extern int sysctl_tcp_fin_timeout;
extern int sysctl_tcp_syncookies;
extern int sysctl_tcp_syn_retries;
extern int sysctl_tcp_stdurg;
extern int sysctl_tcp_rfc1337;
extern int sysctl_tcp_syn_taildrop; 
extern int sysctl_max_syn_backlog; 
extern int sysctl_tcp_tw_recycle;

/* From icmp.c */
extern int sysctl_icmp_destunreach_time;
extern int sysctl_icmp_timeexceed_time;
extern int sysctl_icmp_paramprob_time;
extern int sysctl_icmp_echoreply_time;

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

/* 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;

int tcp_retr1_max = 255; 

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 *buffer, size_t *lenp)
{
	int val = ipv4_devconf.forwarding;
	int ret;

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

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

	return ret;
}

static int ipv4_sysctl_forward_strategy(ctl_table *table, int *name, int nlen,
			 void *oldval, size_t *oldlenp,
			 void *newval, size_t newlen, 
			 void **context)
{
	int new;
	if (newlen != sizeof(int))
		return -EINVAL;
	if (get_user(new,(int *)newval))
		return -EFAULT; 
	if (new != ipv4_devconf.forwarding) 
		inet_forward_change(); 
	return 0; /* caller does change again and handles handles oldval */ 
}

ctl_table ipv4_table[] = {
        {NET_IPV4_TCP_TIMESTAMPS, "tcp_timestamps",
         &sysctl_tcp_timestamps, sizeof(int), 0644, NULL,
         &proc_dointvec},
        {NET_IPV4_TCP_WINDOW_SCALING, "tcp_window_scaling",
         &sysctl_tcp_window_scaling, sizeof(int), 0644, NULL,
         &proc_dointvec},
        {NET_IPV4_TCP_SACK, "tcp_sack",
         &sysctl_tcp_sack, sizeof(int), 0644, NULL,
         &proc_dointvec},
        {NET_IPV4_TCP_RETRANS_COLLAPSE, "tcp_retrans_collapse",
         &sysctl_tcp_retrans_collapse, sizeof(int), 0644, NULL,
         &proc_dointvec},
        {NET_IPV4_FORWARD, "ip_forward",
         &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
         &ipv4_sysctl_forward,&ipv4_sysctl_forward_strategy},
        {NET_IPV4_DEFAULT_TTL, "ip_default_ttl",
         &ip_statistics.IpDefaultTTL, sizeof(int), 0644, NULL,
         &proc_dointvec},
        {NET_IPV4_AUTOCONFIG, "ip_autoconfig",
         &ipv4_config.autoconfig, sizeof(int), 0644, NULL,
         &proc_dointvec},
        {NET_IPV4_NO_PMTU_DISC, "ip_no_pmtu_disc",
         &ipv4_config.no_pmtu_disc, sizeof(int), 0644, NULL,
         &proc_dointvec},
	{NET_IPV4_TCP_SYN_RETRIES, "tcp_syn_retries",
	 &sysctl_tcp_syn_retries, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_IPFRAG_HIGH_THRESH, "ipfrag_high_thresh",
	 &sysctl_ipfrag_high_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_IPFRAG_LOW_THRESH, "ipfrag_low_thresh",
	 &sysctl_ipfrag_low_thresh, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_DYNADDR, "ip_dynaddr",
	 &sysctl_ip_dynaddr, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_IPFRAG_TIME, "ipfrag_time",
	 &sysctl_ipfrag_time, sizeof(int), 0644, NULL, &proc_dointvec_jiffies, 
	 &sysctl_jiffies},
	{NET_IPV4_TCP_KEEPALIVE_TIME, "tcp_keepalive_time",
	 &sysctl_tcp_keepalive_time, sizeof(int), 0644, NULL, 
	 &proc_dointvec_jiffies, &sysctl_jiffies},
	{NET_IPV4_TCP_KEEPALIVE_PROBES, "tcp_keepalive_probes",
	 &sysctl_tcp_keepalive_probes, sizeof(int), 0644, NULL, 
	 &proc_dointvec},
	{NET_IPV4_TCP_KEEPALIVE_INTVL, "tcp_keepalive_intvl",
	 &sysctl_tcp_keepalive_intvl, sizeof(int), 0644, NULL,
	 &proc_dointvec_jiffies, &sysctl_jiffies},
	{NET_IPV4_TCP_RETRIES1, "tcp_retries1",
	 &sysctl_tcp_retries1, sizeof(int), 0644, NULL, &proc_dointvec_minmax, 
	 &sysctl_intvec, NULL, NULL, &tcp_retr1_max},
	{NET_IPV4_TCP_RETRIES2, "tcp_retries2",
	 &sysctl_tcp_retries2, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_TCP_FIN_TIMEOUT, "tcp_fin_timeout",
	 &sysctl_tcp_fin_timeout, sizeof(int), 0644, NULL, 
	 &proc_dointvec_jiffies, &sysctl_jiffies},
#ifdef CONFIG_SYN_COOKIES
	{NET_TCP_SYNCOOKIES, "tcp_syncookies",
	 &sysctl_tcp_syncookies, sizeof(int), 0644, NULL, &proc_dointvec},
#endif
#ifdef CONFIG_TCP_TW_RECYCLE
	{NET_TCP_TW_RECYCLE, "tcp_tw_recycle",
	 &sysctl_tcp_tw_recycle, sizeof(int), 0644, NULL, &proc_dointvec},
#endif
	{NET_TCP_STDURG, "tcp_stdurg", &sysctl_tcp_stdurg,
	 sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_TCP_RFC1337, "tcp_rfc1337", &sysctl_tcp_rfc1337,
	 sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_TCP_MAX_SYN_BACKLOG, "tcp_max_syn_backlog", &sysctl_max_syn_backlog,
	 sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_LOCAL_PORT_RANGE, "ip_local_port_range",
	 &sysctl_local_port_range, sizeof(sysctl_local_port_range), 0644, 
	 NULL, &proc_dointvec},
	{NET_IPV4_ICMP_ECHO_IGNORE_ALL, "icmp_echo_ignore_all",
	 &sysctl_icmp_echo_ignore_all, sizeof(int), 0644, NULL,
	 &proc_dointvec},
	{NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS, "icmp_echo_ignore_broadcasts",
	 &sysctl_icmp_echo_ignore_broadcasts, sizeof(int), 0644, NULL,
	 &proc_dointvec},
	{NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
	 &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
	 &proc_dointvec},
	{NET_IPV4_ICMP_DESTUNREACH_RATE, "icmp_destunreach_rate",
	 &sysctl_icmp_destunreach_time, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_ICMP_TIMEEXCEED_RATE, "icmp_timeexceed_rate",
	 &sysctl_icmp_timeexceed_time, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_ICMP_PARAMPROB_RATE, "icmp_paramprob_rate",
	 &sysctl_icmp_paramprob_time, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_ICMP_ECHOREPLY_RATE, "icmp_echoreply_rate",
	 &sysctl_icmp_echoreply_time, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
#ifdef CONFIG_IP_MULTICAST
	{NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",
	 &sysctl_igmp_max_memberships, sizeof(int), 0644, NULL, &proc_dointvec},
#endif
	{NET_IPV4_INET_PEER_THRESHOLD, "inet_peer_threshold",
	 &inet_peer_threshold, sizeof(int), 0644, NULL, &proc_dointvec},
	{NET_IPV4_INET_PEER_MINTTL, "inet_peer_minttl",
	 &inet_peer_minttl, sizeof(int), 0644, NULL,
	 &proc_dointvec_jiffies, &sysctl_jiffies},
	{NET_IPV4_INET_PEER_MAXTTL, "inet_peer_maxttl",
	 &inet_peer_maxttl, sizeof(int), 0644, NULL,
	 &proc_dointvec_jiffies, &sysctl_jiffies},
	{NET_IPV4_INET_PEER_GC_MINTIME, "inet_peer_gc_mintime",
	 &inet_peer_gc_mintime, sizeof(int), 0644, NULL,
	 &proc_dointvec_jiffies, &sysctl_jiffies},
	{NET_IPV4_INET_PEER_GC_MAXTIME, "inet_peer_gc_maxtime",
	 &inet_peer_gc_maxtime, sizeof(int), 0644, NULL,
	 &proc_dointvec_jiffies, &sysctl_jiffies},
	{0}
};

#endif /* CONFIG_SYSCTL */
