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hook5_2.6_32_v6.c
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hook5_2.6_32_v6.c
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//#define _IPV4_
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
MODULE_LICENSE("GPL");
#ifdef _IPV4_
inline void dumpIpHdr(const char *fn, const struct sk_buff *skb)
{
const struct iphdr *ip = ip_hdr(skb);
const struct tcphdr *tcp = tcp_hdr(skb);
// unsigned char *target_port = "\x00\x50"; // port：80
// if( (tcp->source == *(unsigned short *)target_port)||(tcp->dest == *(unsigned short *)target_port) )
// {
printk(KERN_ALERT "%s, saddr:%pI4:%hu, daddr:%pI4:%hu\n", fn, &ip->saddr, ntohs(tcp->source), &ip->daddr, ntohs(tcp->dest));
if(!strcmp(fn, "postrouting"))
printk(KERN_ALERT "---------------------------------\n");
// }
// ref: sort by ICMP
//if(iph->protocol == IPPROTO_ICMP)
//{
// printk(KERN_INFO"hook_icmp::icmp_srv: receive ICMP packet\n");
// printk(KERN_INFO"src: ");
//}
}
static unsigned int
prerouting(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIpHdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
localin(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIpHdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
localout(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIpHdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
postrouting(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIpHdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
fwding(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIpHdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
#endif
inline void dumpIp6Hdr(const char *fn, const struct sk_buff *skb)
{
const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
const struct tcphdr *tcp = tcp_hdr(skb);
printk(KERN_ALERT "%s, saddr:%pI6:%hu, daddr:%pI6:%hu\n", fn, &ipv6->saddr, ntohs(tcp->source), &ipv6->daddr, ntohs(tcp->dest));
//printk(KERN_ALERT "%s, saddr:%pI6:%d, daddr:%pI6:%d\n", fn, &ipv6->saddr, ntohs(tcp->source), &ipv6->daddr, ntohs(tcp->dest));
//printk(KERN_ALERT "%s, saddr:%pI6:, daddr:%pI6:\n", fn, &ipv6->saddr, &ipv6->daddr );
if(!strcmp(fn, "postrouting6"))
printk(KERN_ALERT "---------------------------------\n");
}
static unsigned int
prerouting6(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIp6Hdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
localin6(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIp6Hdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
localout6(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIp6Hdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
postrouting6(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIp6Hdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static unsigned int
fwding6(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff*))
{
dumpIp6Hdr(__FUNCTION__, skb);
return NF_ACCEPT;
}
static struct nf_hook_ops brook_ops[] __read_mostly = {
#ifdef _IPV4_
{
.hook = prerouting,
.pf = PF_INET,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
}, {
.hook = localin,
.pf = PF_INET,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
}, {
.hook = fwding,
.pf = PF_INET,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
}, {
.hook = localout,
.pf = PF_INET,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
}, {
.hook = postrouting,
.pf = PF_INET,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_RAW,
.owner = THIS_MODULE,
},
#endif
{
.hook = prerouting6,
.pf = PF_INET6,
.hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
}, {
.hook = localin6,
.pf = PF_INET6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
}, {
.hook = fwding6,
.pf = PF_INET6,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
}, {
.hook = localout6,
.pf = PF_INET6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
}, {
.hook = postrouting6,
.pf = PF_INET6,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP6_PRI_FIRST,
.owner = THIS_MODULE,
},
};
static int __init init_modules(void)
{
if (nf_register_hooks(brook_ops, ARRAY_SIZE(brook_ops)) < 0) {
printk("nf_register_hook failed\n");
}
return 0;
}
static void __exit exit_modules(void)
{
nf_unregister_hooks(brook_ops, ARRAY_SIZE(brook_ops));
}
module_init(init_modules);
module_exit(exit_modules);