On Tue, May 8, 2012 at 9:37 AM, Chir0n <io.chir0n@xxxxxxxxx> wrote:
Also dont delete previous mail thread contents.I'm using this Makefile:
obj-m += hello.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
The hello.c is this:
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
static struct nf_hook_ops nfho; //struct holding set of hook function options
//function to be called by hook
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 *))
{
printk(KERN_INFO "packet dropped\n"); //log to var/log/messages
return NF_DROP; //drops the packet
}
//Called when module loaded using 'insmod'
int init_module()
{
nfho.hook = hook_func; //function to call when conditions below met
nfho.hooknum = NF_IP_PRE_ROUTING; //called right after packet recieved, first hook in Netfilter
nfho.pf = PF_INET; //IPV4 packets
nfho.priority = NF_IP_PRI_FIRST; //set to highest priority over all other hook functions
nf_register_hook(&nfho); //register hook
return 0; //return 0 for success
}
//Called when module unloaded using 'rmmod'
void cleanup_module()
{
nf_unregister_hook(&nfho); //cleanup – unregister hook
}
Here are the error message:
$ make
make -C /lib/modules/3.3.2-6.fc16.x86_64/build M=/home/fabio/Desktop/modules modules
make[1]: Entering directory `/usr/src/kernels/3.3.2-6.fc16.x86_64'
CC [M] /home/fabio/Desktop/modules/hello.o
/home/fabio/Desktop/modules/hello.c: In function ‘init_module’:
/home/fabio/Desktop/modules/hello.c:18:13: warning: assignment from incompatible pointer type [enabled by default]
you may have declared the header, thn check whether the path is correct or the symbol name spelling.
/home/fabio/Desktop/modules/hello.c:19:18: error: ‘NF_IP_PRE_ROUTING’ undeclared (first use in this function)
/home/fabio/Desktop/modules/hello.c:19:18: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [/home/fabio/Desktop/modules/hello.o] Error 1
make[1]: *** [_module_/home/fabio/Desktop/modules] Error 2
make[1]: Leaving directory `/usr/src/kernels/3.3.2-6.fc16.x86_64'
make: *** [all] Error 2
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- Rohan
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