net/decnet/sysctl_net_decnet.c - kernel/msm-4.9 - Gitiles

 /*
  * DECnet       An implementation of the DECnet protocol suite for the LINUX
  *              operating system.  DECnet is implemented using the  BSD Socket
  *              interface as the means of communication with the user level.
  *
  *              DECnet sysctl support functions
  *
  * Author:      Steve Whitehouse <SteveW@ACM.org>
  *
  *
  * Changes:
  * Steve Whitehouse - C99 changes and default device handling
  * Steve Whitehouse - Memory buffer settings, like the tcp ones
  *
  */
 #include <linux/config.h>
 #include <linux/mm.h>
 #include <linux/sysctl.h>
 #include <linux/fs.h>
 #include <linux/netdevice.h>
 #include <linux/string.h>
 #include <net/neighbour.h>
 #include <net/dst.h>
 #include <net/flow.h>

 #include <asm/uaccess.h>

 #include <net/dn.h>
 #include <net/dn_dev.h>
 #include <net/dn_route.h>


 int decnet_debug_level;
 int decnet_time_wait = 30;
 int decnet_dn_count = 1;
 int decnet_di_count = 3;
 int decnet_dr_count = 3;
 int decnet_log_martians = 1;
 int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;

 /* Reasonable defaults, I hope, based on tcp's defaults */
 int sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
 int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
 int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };

 #ifdef CONFIG_SYSCTL
 extern int decnet_dst_gc_interval;
 static int min_decnet_time_wait[] = { 5 };
 static int max_decnet_time_wait[] = { 600 };
 static int min_state_count[] = { 1 };
 static int max_state_count[] = { NSP_MAXRXTSHIFT };
 static int min_decnet_dst_gc_interval[] = { 1 };
 static int max_decnet_dst_gc_interval[] = { 60 };
 static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
 static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
 static char node_name[7] = "???";

 static struct ctl_table_header *dn_table_header = NULL;

 /*
  * ctype.h :-)
  */
 #define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
 #define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
 #define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
 #define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
 #define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))

 static void strip_it(char *str)
 {
 	for(;;) {
 		switch(*str) {
 			case ' ':
 			case '\n':
 			case '\r':
 			case ':':
 				*str = 0;
 			case 0:
 				return;
 		}
 		str++;
 	}
 }

 /*
  * Simple routine to parse an ascii DECnet address
  * into a network order address.
  */
 static int parse_addr(dn_address *addr, char *str)
 {
 	dn_address area, node;

 	while(*str && !ISNUM(*str)) str++;

 	if (*str == 0)
 		return -1;

 	area = (*str++ - '0');
 	if (ISNUM(*str)) {
 		area *= 10;
 		area += (*str++ - '0');
 	}

 	if (*str++ != '.')
 		return -1;

 	if (!ISNUM(*str))
 		return -1;

 	node = *str++ - '0';
 	if (ISNUM(*str)) {
 		node *= 10;
 		node += (*str++ - '0');
 	}
 	if (ISNUM(*str)) {
 		node *= 10;
 		node += (*str++ - '0');
 	}
 	if (ISNUM(*str)) {
 		node *= 10;
 		node += (*str++ - '0');
 	}

 	if ((node > 1023) || (area > 63))
 		return -1;

 	if (INVALID_END_CHAR(*str))
 		return -1;

 	*addr = dn_htons((area << 10) | node);

 	return 0;
 }


 static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
 				void __user *oldval, size_t __user *oldlenp,
 				void __user *newval, size_t newlen,
 				void **context)
 {
 	size_t len;
 	dn_address addr;

 	if (oldval && oldlenp) {
 		if (get_user(len, oldlenp))
 			return -EFAULT;
 		if (len) {
 			if (len != sizeof(unsigned short))
 				return -EINVAL;
 			if (put_user(decnet_address, (unsigned short __user *)oldval))
 				return -EFAULT;
 		}
 	}
 	if (newval && newlen) {
 		if (newlen != sizeof(unsigned short))
 			return -EINVAL;
 		if (get_user(addr, (unsigned short __user *)newval))
 			return -EFAULT;

 		dn_dev_devices_off();

 		decnet_address = addr;

 		dn_dev_devices_on();
 	}
 	return 0;
 }

 static int dn_node_address_handler(ctl_table *table, int write,
 				struct file *filp,
 				void __user *buffer,
 				size_t *lenp, loff_t *ppos)
 {
 	char addr[DN_ASCBUF_LEN];
 	size_t len;
 	dn_address dnaddr;

 	if (!*lenp || (*ppos && !write)) {
 		*lenp = 0;
 		return 0;
 	}

 	if (write) {
 		int len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);

 		if (copy_from_user(addr, buffer, len))
 			return -EFAULT;

 		addr[len] = 0;
 		strip_it(addr);

 		if (parse_addr(&dnaddr, addr))
 			return -EINVAL;

 		dn_dev_devices_off();

 		decnet_address = dnaddr;

 		dn_dev_devices_on();

 		*ppos += len;

 		return 0;
 	}

 	dn_addr2asc(dn_ntohs(decnet_address), addr);
 	len = strlen(addr);
 	addr[len++] = '\n';

 	if (len > *lenp) len = *lenp;

 	if (copy_to_user(buffer, addr, len))
 		return -EFAULT;

 	*lenp = len;
 	*ppos += len;

 	return 0;
 }


 static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
 				void __user *oldval, size_t __user *oldlenp,
 				void __user *newval, size_t newlen,
 				void **context)
 {
 	size_t len;
 	struct net_device *dev;
 	char devname[17];
 	size_t namel;
 	int rv = 0;

 	devname[0] = 0;

 	if (oldval && oldlenp) {
 		if (get_user(len, oldlenp))
 			return -EFAULT;
 		if (len) {
 			dev = dn_dev_get_default();
 			if (dev) {
 				strcpy(devname, dev->name);
 				dev_put(dev);
 			}

 			namel = strlen(devname) + 1;
 			if (len > namel) len = namel;

 			if (copy_to_user(oldval, devname, len))
 				return -EFAULT;

 			if (put_user(len, oldlenp))
 				return -EFAULT;
 		}
 	}

 	if (newval && newlen) {
 		if (newlen > 16)
 			return -E2BIG;

 		if (copy_from_user(devname, newval, newlen))
 			return -EFAULT;

 		devname[newlen] = 0;

 		dev = dev_get_by_name(devname);
 		if (dev == NULL)
 			return -ENODEV;

 		rv = -ENODEV;
 		if (dev->dn_ptr != NULL) {
 			rv = dn_dev_set_default(dev, 1);
 			if (rv)
 				dev_put(dev);
 		}
 	}

 	return rv;
 }


 static int dn_def_dev_handler(ctl_table *table, int write,
 				struct file * filp,
 				void __user *buffer,
 				size_t *lenp, loff_t *ppos)
 {
 	size_t len;
 	struct net_device *dev;
 	char devname[17];

 	if (!*lenp || (*ppos && !write)) {
 		*lenp = 0;
 		return 0;
 	}

 	if (write) {
 		if (*lenp > 16)
 			return -E2BIG;

 		if (copy_from_user(devname, buffer, *lenp))
 			return -EFAULT;

 		devname[*lenp] = 0;
 		strip_it(devname);

 		dev = dev_get_by_name(devname);
 		if (dev == NULL)
 			return -ENODEV;

 		if (dev->dn_ptr == NULL) {
 			dev_put(dev);
 			return -ENODEV;
 		}

 		if (dn_dev_set_default(dev, 1)) {
 			dev_put(dev);
 			return -ENODEV;
 		}
 		*ppos += *lenp;

 		return 0;
 	}

 	dev = dn_dev_get_default();
 	if (dev == NULL) {
 		*lenp = 0;
 		return 0;
 	}

 	strcpy(devname, dev->name);
 	dev_put(dev);
 	len = strlen(devname);
 	devname[len++] = '\n';

 	if (len > *lenp) len = *lenp;

 	if (copy_to_user(buffer, devname, len))
 		return -EFAULT;

 	*lenp = len;
 	*ppos += len;

 	return 0;
 }

 static ctl_table dn_table[] = {
 	{
 		.ctl_name = NET_DECNET_NODE_ADDRESS,
 		.procname = "node_address",
 		.maxlen = 7,
 		.mode = 0644,
 		.proc_handler = dn_node_address_handler,
 		.strategy = dn_node_address_strategy,
 	},
 	{
 		.ctl_name = NET_DECNET_NODE_NAME,
 		.procname = "node_name",
 		.data = node_name,
 		.maxlen = 7,
 		.mode = 0644,
 		.proc_handler = &proc_dostring,
 		.strategy = &sysctl_string,
 	},
 	{
 		.ctl_name = NET_DECNET_DEFAULT_DEVICE,
 		.procname = "default_device",
 		.maxlen = 16,
 		.mode = 0644,
 		.proc_handler = dn_def_dev_handler,
 		.strategy = dn_def_dev_strategy,
 	},
 	{
 		.ctl_name = NET_DECNET_TIME_WAIT,
 		.procname = "time_wait",
 		.data = &decnet_time_wait,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec_minmax,
 		.strategy = &sysctl_intvec,
 		.extra1 = &min_decnet_time_wait,
 		.extra2 = &max_decnet_time_wait
 	},
 	{
 		.ctl_name = NET_DECNET_DN_COUNT,
 		.procname = "dn_count",
 		.data = &decnet_dn_count,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec_minmax,
 		.strategy = &sysctl_intvec,
 		.extra1 = &min_state_count,
 		.extra2 = &max_state_count
 	},
 	{
 		.ctl_name = NET_DECNET_DI_COUNT,
 		.procname = "di_count",
 		.data = &decnet_di_count,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec_minmax,
 		.strategy = &sysctl_intvec,
 		.extra1 = &min_state_count,
 		.extra2 = &max_state_count
 	},
 	{
 		.ctl_name = NET_DECNET_DR_COUNT,
 		.procname = "dr_count",
 		.data = &decnet_dr_count,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec_minmax,
 		.strategy = &sysctl_intvec,
 		.extra1 = &min_state_count,
 		.extra2 = &max_state_count
 	},
 	{
 		.ctl_name = NET_DECNET_DST_GC_INTERVAL,
 		.procname = "dst_gc_interval",
 		.data = &decnet_dst_gc_interval,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec_minmax,
 		.strategy = &sysctl_intvec,
 		.extra1 = &min_decnet_dst_gc_interval,
 		.extra2 = &max_decnet_dst_gc_interval
 	},
 	{
 		.ctl_name = NET_DECNET_NO_FC_MAX_CWND,
 		.procname = "no_fc_max_cwnd",
 		.data = &decnet_no_fc_max_cwnd,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec_minmax,
 		.strategy = &sysctl_intvec,
 		.extra1 = &min_decnet_no_fc_max_cwnd,
 		.extra2 = &max_decnet_no_fc_max_cwnd
 	},
        {
                 .ctl_name = NET_DECNET_MEM,
                 .procname = "decnet_mem",
                 .data = &sysctl_decnet_mem,
                 .maxlen = sizeof(sysctl_decnet_mem),
                 .mode = 0644,
                 .proc_handler = &proc_dointvec,
                 .strategy = &sysctl_intvec,
         },
         {
                 .ctl_name = NET_DECNET_RMEM,
                 .procname = "decnet_rmem",
                 .data = &sysctl_decnet_rmem,
                 .maxlen = sizeof(sysctl_decnet_rmem),
                 .mode = 0644,
                 .proc_handler = &proc_dointvec,
                 .strategy = &sysctl_intvec,
         },
         {
                 .ctl_name = NET_DECNET_WMEM,
                 .procname = "decnet_wmem",
                 .data = &sysctl_decnet_wmem,
                 .maxlen = sizeof(sysctl_decnet_wmem),
                 .mode = 0644,
                 .proc_handler = &proc_dointvec,
                 .strategy = &sysctl_intvec,
         },
 	{
 		.ctl_name = NET_DECNET_DEBUG_LEVEL,
 		.procname = "debug",
 		.data = &decnet_debug_level,
 		.maxlen = sizeof(int),
 		.mode = 0644,
 		.proc_handler = &proc_dointvec,
 		.strategy = &sysctl_intvec,
 	},
 	{0}
 };

 static ctl_table dn_dir_table[] = {
 	{
 		.ctl_name = NET_DECNET,
 		.procname = "decnet",
 		.mode = 0555,
 		.child = dn_table},
 	{0}
 };

 static ctl_table dn_root_table[] = {
 	{
 		.ctl_name = CTL_NET,
 		.procname = "net",
 		.mode = 0555,
 		.child = dn_dir_table
 	},
 	{0}
 };

 void dn_register_sysctl(void)
 {
 	dn_table_header = register_sysctl_table(dn_root_table, 1);
 }

 void dn_unregister_sysctl(void)
 {
 	unregister_sysctl_table(dn_table_header);
 }

 #else  /* CONFIG_SYSCTL */
 void dn_unregister_sysctl(void)
 {
 }
 void dn_register_sysctl(void)
 {
 }

 #endif
	/*
	* DECnet An implementation of the DECnet protocol suite for the LINUX
	* operating system. DECnet is implemented using the BSD Socket
	* interface as the means of communication with the user level.
	*
	* DECnet sysctl support functions
	*
	* Author: Steve Whitehouse <SteveW@ACM.org>
	*
	*
	* Changes:
	* Steve Whitehouse - C99 changes and default device handling
	* Steve Whitehouse - Memory buffer settings, like the tcp ones
	*
	*/
	#include <linux/config.h>
	#include <linux/mm.h>
	#include <linux/sysctl.h>
	#include <linux/fs.h>
	#include <linux/netdevice.h>
	#include <linux/string.h>
	#include <net/neighbour.h>
	#include <net/dst.h>
	#include <net/flow.h>

	#include <asm/uaccess.h>

	#include <net/dn.h>
	#include <net/dn_dev.h>
	#include <net/dn_route.h>


	int decnet_debug_level;
	int decnet_time_wait = 30;
	int decnet_dn_count = 1;
	int decnet_di_count = 3;
	int decnet_dr_count = 3;
	int decnet_log_martians = 1;
	int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;

	/* Reasonable defaults, I hope, based on tcp's defaults */
	int sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
	int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
	int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };

	#ifdef CONFIG_SYSCTL
	extern int decnet_dst_gc_interval;
	static int min_decnet_time_wait[] = { 5 };
	static int max_decnet_time_wait[] = { 600 };
	static int min_state_count[] = { 1 };
	static int max_state_count[] = { NSP_MAXRXTSHIFT };
	static int min_decnet_dst_gc_interval[] = { 1 };
	static int max_decnet_dst_gc_interval[] = { 60 };
	static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
	static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
	static char node_name[7] = "???";

	static struct ctl_table_header *dn_table_header = NULL;

	/*
	* ctype.h :-)
	*/
	#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
	#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
	#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
	#define ISALPHA(x) (ISLOWER(x) \|\| ISUPPER(x))
	#define INVALID_END_CHAR(x) (ISNUM(x) \|\| ISALPHA(x))

	static void strip_it(char *str)
	{
	for(;;) {
	switch(*str) {
	case ' ':
	case '\n':
	case '\r':
	case ':':
	*str = 0;
	case 0:
	return;
	}
	str++;
	}
	}

	/*
	* Simple routine to parse an ascii DECnet address
	* into a network order address.
	*/
	static int parse_addr(dn_address addr, char str)
	{
	dn_address area, node;

	while(str && !ISNUM(str)) str++;

	if (*str == 0)
	return -1;

	area = (*str++ - '0');
	if (ISNUM(*str)) {
	area *= 10;
	area += (*str++ - '0');
	}

	if (*str++ != '.')
	return -1;

	if (!ISNUM(*str))
	return -1;

	node = *str++ - '0';
	if (ISNUM(*str)) {
	node *= 10;
	node += (*str++ - '0');
	}
	if (ISNUM(*str)) {
	node *= 10;
	node += (*str++ - '0');
	}
	if (ISNUM(*str)) {
	node *= 10;
	node += (*str++ - '0');
	}

	if ((node > 1023) \|\| (area > 63))
	return -1;

	if (INVALID_END_CHAR(*str))
	return -1;

	*addr = dn_htons((area << 10) \| node);

	return 0;
	}


	static int dn_node_address_strategy(ctl_table table, int __user name, int nlen,
	void __user oldval, size_t __user oldlenp,
	void __user *newval, size_t newlen,
	void **context)
	{
	size_t len;
	dn_address addr;

	if (oldval && oldlenp) {
	if (get_user(len, oldlenp))
	return -EFAULT;
	if (len) {
	if (len != sizeof(unsigned short))
	return -EINVAL;
	if (put_user(decnet_address, (unsigned short __user *)oldval))
	return -EFAULT;
	}
	}
	if (newval && newlen) {
	if (newlen != sizeof(unsigned short))
	return -EINVAL;
	if (get_user(addr, (unsigned short __user *)newval))
	return -EFAULT;

	dn_dev_devices_off();

	decnet_address = addr;

	dn_dev_devices_on();
	}
	return 0;
	}

	static int dn_node_address_handler(ctl_table *table, int write,
	struct file *filp,
	void __user *buffer,
	size_t lenp, loff_t ppos)
	{
	char addr[DN_ASCBUF_LEN];
	size_t len;
	dn_address dnaddr;

	if (!lenp \|\| (ppos && !write)) {
	*lenp = 0;
	return 0;
	}

	if (write) {
	int len = (lenp < DN_ASCBUF_LEN) ? lenp : (DN_ASCBUF_LEN-1);

	if (copy_from_user(addr, buffer, len))
	return -EFAULT;

	addr[len] = 0;
	strip_it(addr);

	if (parse_addr(&dnaddr, addr))
	return -EINVAL;

	dn_dev_devices_off();

	decnet_address = dnaddr;

	dn_dev_devices_on();

	*ppos += len;

	return 0;
	}

	dn_addr2asc(dn_ntohs(decnet_address), addr);
	len = strlen(addr);
	addr[len++] = '\n';

	if (len > lenp) len = lenp;

	if (copy_to_user(buffer, addr, len))
	return -EFAULT;

	*lenp = len;
	*ppos += len;

	return 0;
	}


	static int dn_def_dev_strategy(ctl_table table, int __user name, int nlen,
	void __user oldval, size_t __user oldlenp,
	void __user *newval, size_t newlen,
	void **context)
	{
	size_t len;
	struct net_device *dev;
	char devname[17];
	size_t namel;
	int rv = 0;

	devname[0] = 0;

	if (oldval && oldlenp) {
	if (get_user(len, oldlenp))
	return -EFAULT;
	if (len) {
	dev = dn_dev_get_default();
	if (dev) {
	strcpy(devname, dev->name);
	dev_put(dev);
	}

	namel = strlen(devname) + 1;
	if (len > namel) len = namel;

	if (copy_to_user(oldval, devname, len))
	return -EFAULT;

	if (put_user(len, oldlenp))
	return -EFAULT;
	}
	}

	if (newval && newlen) {
	if (newlen > 16)
	return -E2BIG;

	if (copy_from_user(devname, newval, newlen))
	return -EFAULT;

	devname[newlen] = 0;

	dev = dev_get_by_name(devname);
	if (dev == NULL)
	return -ENODEV;

	rv = -ENODEV;
	if (dev->dn_ptr != NULL) {
	rv = dn_dev_set_default(dev, 1);
	if (rv)
	dev_put(dev);
	}
	}

	return rv;
	}


	static int dn_def_dev_handler(ctl_table *table, int write,
	struct file * filp,
	void __user *buffer,
	size_t lenp, loff_t ppos)
	{
	size_t len;
	struct net_device *dev;
	char devname[17];

	if (!lenp \|\| (ppos && !write)) {
	*lenp = 0;
	return 0;
	}

	if (write) {
	if (*lenp > 16)
	return -E2BIG;

	if (copy_from_user(devname, buffer, *lenp))
	return -EFAULT;

	devname[*lenp] = 0;
	strip_it(devname);

	dev = dev_get_by_name(devname);
	if (dev == NULL)
	return -ENODEV;

	if (dev->dn_ptr == NULL) {
	dev_put(dev);
	return -ENODEV;
	}

	if (dn_dev_set_default(dev, 1)) {
	dev_put(dev);
	return -ENODEV;
	}
	ppos += lenp;

	return 0;
	}

	dev = dn_dev_get_default();
	if (dev == NULL) {
	*lenp = 0;
	return 0;
	}

	strcpy(devname, dev->name);
	dev_put(dev);
	len = strlen(devname);
	devname[len++] = '\n';

	if (len > lenp) len = lenp;

	if (copy_to_user(buffer, devname, len))
	return -EFAULT;

	*lenp = len;
	*ppos += len;

	return 0;
	}

	static ctl_table dn_table[] = {
	{
	.ctl_name = NET_DECNET_NODE_ADDRESS,
	.procname = "node_address",
	.maxlen = 7,
	.mode = 0644,
	.proc_handler = dn_node_address_handler,
	.strategy = dn_node_address_strategy,
	},
	{
	.ctl_name = NET_DECNET_NODE_NAME,
	.procname = "node_name",
	.data = node_name,
	.maxlen = 7,
	.mode = 0644,
	.proc_handler = &proc_dostring,
	.strategy = &sysctl_string,
	},
	{
	.ctl_name = NET_DECNET_DEFAULT_DEVICE,
	.procname = "default_device",
	.maxlen = 16,
	.mode = 0644,
	.proc_handler = dn_def_dev_handler,
	.strategy = dn_def_dev_strategy,
	},
	{
	.ctl_name = NET_DECNET_TIME_WAIT,
	.procname = "time_wait",
	.data = &decnet_time_wait,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec_minmax,
	.strategy = &sysctl_intvec,
	.extra1 = &min_decnet_time_wait,
	.extra2 = &max_decnet_time_wait
	},
	{
	.ctl_name = NET_DECNET_DN_COUNT,
	.procname = "dn_count",
	.data = &decnet_dn_count,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec_minmax,
	.strategy = &sysctl_intvec,
	.extra1 = &min_state_count,
	.extra2 = &max_state_count
	},
	{
	.ctl_name = NET_DECNET_DI_COUNT,
	.procname = "di_count",
	.data = &decnet_di_count,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec_minmax,
	.strategy = &sysctl_intvec,
	.extra1 = &min_state_count,
	.extra2 = &max_state_count
	},
	{
	.ctl_name = NET_DECNET_DR_COUNT,
	.procname = "dr_count",
	.data = &decnet_dr_count,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec_minmax,
	.strategy = &sysctl_intvec,
	.extra1 = &min_state_count,
	.extra2 = &max_state_count
	},
	{
	.ctl_name = NET_DECNET_DST_GC_INTERVAL,
	.procname = "dst_gc_interval",
	.data = &decnet_dst_gc_interval,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec_minmax,
	.strategy = &sysctl_intvec,
	.extra1 = &min_decnet_dst_gc_interval,
	.extra2 = &max_decnet_dst_gc_interval
	},
	{
	.ctl_name = NET_DECNET_NO_FC_MAX_CWND,
	.procname = "no_fc_max_cwnd",
	.data = &decnet_no_fc_max_cwnd,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec_minmax,
	.strategy = &sysctl_intvec,
	.extra1 = &min_decnet_no_fc_max_cwnd,
	.extra2 = &max_decnet_no_fc_max_cwnd
	},
	{
	.ctl_name = NET_DECNET_MEM,
	.procname = "decnet_mem",
	.data = &sysctl_decnet_mem,
	.maxlen = sizeof(sysctl_decnet_mem),
	.mode = 0644,
	.proc_handler = &proc_dointvec,
	.strategy = &sysctl_intvec,
	},
	{
	.ctl_name = NET_DECNET_RMEM,
	.procname = "decnet_rmem",
	.data = &sysctl_decnet_rmem,
	.maxlen = sizeof(sysctl_decnet_rmem),
	.mode = 0644,
	.proc_handler = &proc_dointvec,
	.strategy = &sysctl_intvec,
	},
	{
	.ctl_name = NET_DECNET_WMEM,
	.procname = "decnet_wmem",
	.data = &sysctl_decnet_wmem,
	.maxlen = sizeof(sysctl_decnet_wmem),
	.mode = 0644,
	.proc_handler = &proc_dointvec,
	.strategy = &sysctl_intvec,
	},
	{
	.ctl_name = NET_DECNET_DEBUG_LEVEL,
	.procname = "debug",
	.data = &decnet_debug_level,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = &proc_dointvec,
	.strategy = &sysctl_intvec,
	},
	{0}
	};

	static ctl_table dn_dir_table[] = {
	{
	.ctl_name = NET_DECNET,
	.procname = "decnet",
	.mode = 0555,
	.child = dn_table},
	{0}
	};

	static ctl_table dn_root_table[] = {
	{
	.ctl_name = CTL_NET,
	.procname = "net",
	.mode = 0555,
	.child = dn_dir_table
	},
	{0}
	};

	void dn_register_sysctl(void)
	{
	dn_table_header = register_sysctl_table(dn_root_table, 1);
	}

	void dn_unregister_sysctl(void)
	{
	unregister_sysctl_table(dn_table_header);
	}

	#else /* CONFIG_SYSCTL */
	void dn_unregister_sysctl(void)
	{
	}
	void dn_register_sysctl(void)
	{
	}

	#endif