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/* nf_sysctl.c netfilter sysctl registration/unregistation
*
* Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
*/
#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/string.h>
#include <linux/slab.h>
static void
path_free(struct ctl_table *path, struct ctl_table *table)
{
struct ctl_table *t, *next;
for (t = path; t != NULL && t != table; t = next) {
next = t->child;
kfree(t);
}
}
static struct ctl_table *
path_dup(struct ctl_table *path, struct ctl_table *table)
{
struct ctl_table *t, *last = NULL, *tmp;
for (t = path; t != NULL; t = t->child) {
/* twice the size since path elements are terminated by an
* empty element */
tmp = kmemdup(t, 2 * sizeof(*t), GFP_KERNEL);
if (tmp == NULL) {
if (last != NULL)
path_free(path, table);
return NULL;
}
if (last != NULL)
last->child = tmp;
else
path = tmp;
last = tmp;
}
if (last != NULL)
last->child = table;
else
path = table;
return path;
}
struct ctl_table_header *
nf_register_sysctl_table(struct ctl_table *path, struct ctl_table *table)
{
struct ctl_table_header *header;
path = path_dup(path, table);
if (path == NULL)
return NULL;
header = register_sysctl_table(path);
if (header == NULL)
path_free(path, table);
return header;
}
EXPORT_SYMBOL_GPL(nf_register_sysctl_table);
void
nf_unregister_sysctl_table(struct ctl_table_header *header,
struct ctl_table *table)
{
struct ctl_table *path = header->ctl_table;
unregister_sysctl_table(header);
path_free(path, table);
}
EXPORT_SYMBOL_GPL(nf_unregister_sysctl_table);
/* net/netfilter */
static struct ctl_table nf_net_netfilter_table[] = {
{
.ctl_name = NET_NETFILTER,
.procname = "netfilter",
.mode = 0555,
},
{
.ctl_name = 0
}
};
struct ctl_table nf_net_netfilter_sysctl_path[] = {
{
.ctl_name = CTL_NET,
.procname = "net",
.mode = 0555,
.child = nf_net_netfilter_table,
},
{
.ctl_name = 0
}
};
EXPORT_SYMBOL_GPL(nf_net_netfilter_sysctl_path);
/* net/ipv4/netfilter */
static struct ctl_table nf_net_ipv4_netfilter_table[] = {
{
.ctl_name = NET_IPV4_NETFILTER,
.procname = "netfilter",
.mode = 0555,
},
{
.ctl_name = 0
}
};
static struct ctl_table nf_net_ipv4_table[] = {
{
.ctl_name = NET_IPV4,
.procname = "ipv4",
.mode = 0555,
.child = nf_net_ipv4_netfilter_table,
},
{
.ctl_name = 0
}
};
struct ctl_table nf_net_ipv4_netfilter_sysctl_path[] = {
{
.ctl_name = CTL_NET,
.procname = "net",
.mode = 0555,
.child = nf_net_ipv4_table,
},
{
.ctl_name = 0
}
};
EXPORT_SYMBOL_GPL(nf_net_ipv4_netfilter_sysctl_path);
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