#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/net.h>
#include <net/sock.h>
#include <linux/in.h>
#include <linux/types.h>
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/skbuff.h>
#include <linux/string.h>
#include <asm-generic/unaligned.h>
#include <linux/sysctl.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <asm/checksum.h>
#include <linux/ip.h>
#include <linux/workqueue.h>
#define err(msg) printk(KERN_INFO "%s failed.\n", msg)
static int sysctl_sg_vs_amemthresh = 1024;
static int proc_do_defense_mode(ctl_table *table, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
{
int rc;
int *data = table->data;
printk(KERN_INFO "original value = %d\n", *data);
rc = proc_dointvec(table, write, filp, buffer, lenp, ppos);
if (write)
printk(KERN_INFO "this is write operation, current value = %d\n", *data);
return rc;
}
static struct ctl_table sg_vars[] = {
{
.procname = "amemthresh",
.data = &sysctl_sg_vs_amemthresh,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_do_defense_mode,
},
{
.ctl_name = 0,
},
};
static struct ctl_table_header *sysctl_header;
static int __init main_init(void)
{
sysctl_header = register_sysctl_table(sg_vars);
if (sysctl_header == NULL) {
err("register_sysctl_table");
goto out;
}
printk(KERN_INFO "sysctl register success.\n");
return 0;
out:
return -1;
}
static void __exit main_exit(void)
{
unregister_sysctl_table(sysctl_header);
printk(KERN_INFO "sysctl unregister success.\n");
}
module_init(main_init);
module_exit(main_exit);
MODULE_LICENSE("GPL");
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