Hello,
I wrote a simple, short (35 lines) netfilter module (XTable target)
The code is below.
I build it and insmoded it.
When I try to add this iptables rule:
iptables -A OUTPUT -p UDP --dport 9998 -j ECHO
I get this error:
iptables v1.4.5: Couldn't load target `ECHO':/lib64/xtables/libipt_ECHO.so:
cannot open shared object file: No such file or directory
My question is: for a simple netfilter module like this ("ECHO"), must
I create a
corresponding shared library (libipt_ECHO.so)?
Is there a way to avoid this when adding such a rule,
using some default mechansim ?
here is the code for the kernel module I wrote:
// echoTarget.c
#include "linux/netfilter/x_tables.h"
static unsigned int echo_tg4(struct sk_buff *skb,
const struct xt_target_param *par)
{
printk("in %s %s\n",__FUNCTION__,__FILE__);
return NF_DROP;
}
static struct xt_target echo_tg_reg = {
.name = "ECHO",
.revision = 0,
.family = NFPROTO_IPV4,
.proto = IPPROTO_UDP,
.target = echo_tg4,
.me = THIS_MODULE,
};
static int __init echo_tg_init(void)
{
return xt_register_target(&echo_tg_reg);
}
static void __exit echo_tg_exit(void)
{
xt_unregister_target(&echo_tg_reg);
}
module_init(echo_tg_init);
module_exit(echo_tg_exit);
MODULE_AUTHOR ("test");
MODULE_DESCRIPTION ("tartet");
MODULE_LICENSE("GPL");
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