hai,
i am a new bie. when i am trying to compile the
following program
#define __KERNEL__
#define MODULE
#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/netfilter.h>
#include<linux/netfilter_ipv4.h>
static struct nf_hook_ops nfho;
unsigned int hook_func(unsigned int hooknum,
struct sk_buff **skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
return NF_DROP;
}
int init_module()
{
nfho.hook=hook_func;
nfho.hooknum=NF_IP_PRE_ROUTING;
nfho.pf=PF_INET;
nfho.priority=NF_IP_PRI_FIRST;
nf_register_hook(&nfho);
return 0;
}
void cleanup_module()
{
nf_unregister_hook(&nfho);
}
i got the following errors .
[root@localhost vamsi]# gcc -c p1.c
In file included from p1.c:7:
/usr/include/linux/netfilter_ipv4.h:53: `INT_MIN'
undeclared here (not in a function)
/usr/include/linux/netfilter_ipv4.h:53: enumerator
value for `NF_IP_PRI_FIRST' not integer constant
/usr/include/linux/netfilter_ipv4.h:59: `INT_MAX'
undeclared here (not in a function)
/usr/include/linux/netfilter_ipv4.h:59: enumerator
value for `NF_IP_PRI_LAST' not integer constant
p1.c:15: warning: `struct net_device' declared inside
parameter list
p1.c:15: warning: its scope is only this definition or
declaration, which is probably not what you want
p1.c:15: warning: `struct sk_buff' declared inside
parameter list
p1.c: In function `init_module':
p1.c:22: invalid use of undefined type `struct
nf_hook_ops'
p1.c:23: invalid use of undefined type `struct
nf_hook_ops'
p1.c:24: invalid use of undefined type `struct
nf_hook_ops'
p1.c:24: `PF_INET' undeclared (first use in this
function)
p1.c:24: (Each undeclared identifier is reported only
once
p1.c:24: for each function it appears in.)
p1.c:25: invalid use of undefined type `struct
nf_hook_ops'
p1.c: At top level:
p1.c:9: storage size of `nfho' isn't known
please help me,
thanks,
vamsi
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