Hello .
I am trying to compile the below code to make a lkm. but when i do an insmod
i get a bunch of errors
appreciate all help.
truely
dheeraj
=====
/*
$Id: hellomod.c,v 1.2 2002/11/18 18:41:46 dheeraj Exp dheeraj $
*/
#define __KERNEL__ /* We're part of the kernel */
#define MODULE /* Not a permanent part, though. */
/* #define _LOOSE_KERNEL_NAMES */
/* Standard headers for LKMs */
#include <linux/modversions.h>
#include <linux/module.h>
#include <linux/byteorder/generic.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/netfilter_ipv4.h>
#include <linux/tty.h> /* console_print() interface */
enum {
IPPROTO_IP = 0,
IPPROTO_TCP = 6
};
/*
NF_IP_PRI_FILTER specifies relative priority
-1 is before netfiltering
+1 is aimmediately after netfiltering
*/
static unsigned int dhee_hook (unsigned int hook,
struct sk_buff **skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *)
)
{
/* unsigned char* ipv4_data = */
/* (void*) (*skb)->nh.iph + (*skb)->nh.iph->ihl*4; */
const struct iphdr *ip = (*skb)->nh.iph;
struct tcphdr *mytcphdr;
/* if the protocol is tcp */
if(ip->protocol == IPPROTO_TCP)
{
printk("TCP::"
"%d.%d.%d%d:%hu --> %d.%d.%d%d:%hu \n",
(ntohl(ip->saddr)>>24) & 0xff,
(ntohl(ip->saddr)>>16) & 0xff,
(ntohl(ip->saddr)>>8) & 0xff,
(ntohl(ip->saddr)>>0) & 0xff,
ntohs(mytcphdr->source),
(ntohl(ip->daddr)>>24) & 0xff,
(ntohl(ip->daddr)>>16) & 0xff,
(ntohl(ip->daddr)>>8) & 0xff,
(ntohl(ip->daddr)>>0) & 0xff,
ntohs(mytcphdr->dest)
);
}
return NF_ACCEPT;
}
static struct nf_hook_ops dhee_hook_ops =
{
{NULL, NULL},
dhee_hook,
PF_INET,
NF_IP_LOCAL_IN,
NF_IP_PRI_FILTER+1
};
void dhee_ksym()
{
return;
}
/* Initialize */
int init_module()
{
dhee_ksym();
printk("Hello, world - this is the kernel speaking\n");
return nf_register_hook(&dhee_hook_ops);
}
/* Cleanup */
void cleanup_module ()
{
nf_unregister_hook(&dhee_hook_ops);
printk("Short is the life of an LKM\n");
}
============
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