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List: netfilter-devel
Subject: Is my program is correct to print packet data part at IP layer?
From: linux lover <linux_lover2004 () yahoo ! com>
Date: 2004-12-31 12:13:03
Message-ID: 20041231121303.59844.qmail () web52204 ! mail ! yahoo ! com
[Download RAW message or body]
Respected sir,
I request you to please check my program
and reply me whether it is the correct way of getting
packets data part at IP layer? I am using netfilter
and dumping its output to unsigned string. I just want
to know the results return by following program is
correct or wrong?
regards,
linux_lover.
#define MODULE
#define __KERNEL__
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/string.h>
static struct nf_hook_ops nfho1;
unsigned int hook_func1(unsigned int hooknum,struct
sk_buff **skb,
const struct
net_device *in,
const struct
net_device *out,
int (*okfn)(struct
sk_buff *))
{
struct sk_buff *sb = *skb;
printk(KERN_DEBUG "calling hook_func at
NF_IP_LOCAL_OUT\n");
unsigned char *packet;
unsigned int buflen;
int i=0;
buflen=sb->len;
packet=kmalloc(buflen,GFP_USER);
memset(packet,'\0',buflen);
printk(KERN_DEBUG "Length of skb->data in hook
function = %d\n", buflen);
strncpy(packet,sb->data,buflen);
printk(KERN_DEBUG "packet contents of sb->data
in hook function = %02x\n", packet);
return NF_ACCEPT;
}
static int __init init(void)
{
nfho1.hook = hook_func1;
nfho1.hooknum = NF_IP_LOCAL_OUT;
nfho1.pf = PF_INET;
nfho1.priority = NF_IP_PRI_FIRST;
nf_register_hook(&nfho1);
return 0;
}
static void __exit fini(void)
{
nf_unregister_hook(&nfho1);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
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