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/*
* 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/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(__le16 *addr, char *str)
{
__u16 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;
__le16 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, (__le16 __user *)oldval))
return -EFAULT;
}
}
if (newval && newlen) {
if (newlen != sizeof(unsigned short))
return -EINVAL;
if (get_user(addr, (__le16 __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;
__le16 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
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