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Adapt pfwall_module.c to the Linux 4.13.0 netfilter changes #1

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Adapt pfwall_module.c to the Linux 4.13.0 netfilter changes #1

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36 changes: 27 additions & 9 deletions pfwall_module.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ Main kernel module core working is defined here
#define PF_KERNELSPACE

#include "pfwall_module.h"
#include <linux/version.h>

// Rules linked list
static LIST_HEAD(rules_list);
Expand All @@ -16,19 +17,17 @@ static struct nf_hook_ops nfhi;
static struct nf_hook_ops nfho;

// Incoming traffic hook.
unsigned int pfwall_hook_in(unsigned int hooknum, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff*))
unsigned int pfwall_hook_in(void *priv_unused,
struct sk_buff *skb,
const struct nf_hook_state *state_unused)
{
return packet_handle(skb, DIRECTION_IN);
}

// Outgoing traffic hook.
unsigned int pfwall_hook_out(unsigned int hooknum, struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff*))
unsigned int pfwall_hook_out(void *priv_unused,
struct sk_buff *skb,
const struct nf_hook_state *state_unused)
{
return packet_handle(skb, DIRECTION_OUT);
}
Expand Down Expand Up @@ -374,6 +373,9 @@ int sysfs_init(void)
// Initialize module
int pfwall_init(void)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,13,0)
struct net *n;
#endif
printk("Pfwall: module inserted.\n");

//Register Netfilter hooks.
Expand All @@ -382,14 +384,22 @@ int pfwall_init(void)
nfhi.hooknum = NF_INET_PRE_ROUTING;
nfhi.pf = PF_INET;
nfhi.priority = NF_IP_PRI_FIRST;
nf_register_hook(&nfhi);

// Outgoing
nfho.hook = pfwall_hook_out;
nfho.hooknum = NF_INET_POST_ROUTING;
nfho.pf = PF_INET;
nfho.priority = NF_IP_PRI_FIRST;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,13,0)
for_each_net(n)
nf_register_net_hook(n, &nfhi);
for_each_net(n)
nf_register_net_hook(n, &nfho);
#else
nf_register_hook(&nfhi);
nf_register_hook(&nfho);
#endif

// Create sysfs class
return sysfs_init();
Expand All @@ -399,8 +409,16 @@ int pfwall_init(void)
void pfwall_exit(void)
{
// Unregister Netfilter hooks.
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,13,0)
struct net *n;
for_each_net(n)
nf_unregister_net_hook(n, &nfhi);
for_each_net(n)
nf_unregister_net_hook(n, &nfho);
#else
nf_unregister_hook(&nfhi);
nf_unregister_hook(&nfho);
#endif

// Destroy sysfs class
class_destroy(PF_class);
Expand Down