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DEFINITIONS
This source file includes following definitions.
- strip_it
- parse_addr
- dn_node_address_strategy
- dn_node_address_handler
- dn_def_dev_strategy
- dn_def_dev_handler
- dn_register_sysctl
- dn_unregister_sysctl
- dn_unregister_sysctl
- dn_register_sysctl
/*
* 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)
{
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)
{
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(&init_net, 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(&init_net, 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 struct ctl_path dn_path[] = {
{ .procname = "net", .ctl_name = CTL_NET, },
{ .procname = "decnet", .ctl_name = NET_DECNET, },
{ }
};
void dn_register_sysctl(void)
{
dn_table_header = register_sysctl_paths(dn_path, dn_table);
}
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