From 7305859e0ce1c71419870ce3eb555f15ffd42ec5 Mon Sep 17 00:00:00 2001
From: Brian Stanback <stanback@gmail.com>
Date: Fri, 20 Sep 2019 14:34:17 -0700
Subject: [PATCH] Add support for Linux kernel 5.0.0

---
 xt_NAT.c | 41 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/xt_NAT.c b/xt_NAT.c
index a786f1f..a42d3e1 100644
--- a/xt_NAT.c
+++ b/xt_NAT.c
@@ -545,8 +545,12 @@ static void netflow_sendmsg(void *buffer, const int len)
 
 static void netflow_export_pdu_v5(void)
 {
-    struct timeval tv;
     int pdusize;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+    struct timespec64 ts;
+#else
+    struct timeval tv;
+#endif
 
     //printk(KERN_DEBUG "xt_NAT NEL: Forming PDU seq %d, %d records\n", pdu_seq, pdu_data_records);
 
@@ -556,9 +560,15 @@ static void netflow_export_pdu_v5(void)
     pdu.version		= htons(5);
     pdu.nr_records	= htons(pdu_data_records);
     pdu.ts_uptime	= htonl(jiffies_to_msecs(jiffies));
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+    ktime_get_real_ts64(&ts);
+    pdu.ts_usecs = htonl(ts.tv_sec);
+    pdu.ts_unsecs = htonl(ts.tv_nsec/1000);
+#else
     do_gettimeofday(&tv);
-    pdu.ts_usecs		= htonl(tv.tv_sec);
-    pdu.ts_unsecs	= htonl(tv.tv_usec);
+    pdu.ts_usecs = htonl(tv.tv_sec);
+    pdu.ts_unsecs = htonl(tv.tv_usec);
+#endif
     pdu.seq		= htonl(pdu_seq);
     //pdu.v5.eng_type	= 0;
     pdu.eng_id		= (__u8)engine_id;
@@ -1322,7 +1332,11 @@ nat_tg(struct sk_buff *skb, const struct xt_action_param *par)
     return NF_ACCEPT;
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+void users_cleanup_timer_callback( struct timer_list *timer )
+#else
 void users_cleanup_timer_callback( unsigned long data )
+#endif
 {
     struct user_htable_ent *user;
     struct hlist_head *head;
@@ -1372,7 +1386,11 @@ void users_cleanup_timer_callback( unsigned long data )
     spin_unlock_bh(&users_timer_lock);
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+void sessions_cleanup_timer_callback( struct timer_list *timer )
+#else
 void sessions_cleanup_timer_callback( unsigned long data )
+#endif
 {
     struct nat_htable_ent *session;
     struct hlist_head *head;
@@ -1441,7 +1459,11 @@ void sessions_cleanup_timer_callback( unsigned long data )
     spin_unlock_bh(&sessions_timer_lock);
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+void nf_send_timer_callback( struct timer_list *timer )
+#else
 void nf_send_timer_callback( unsigned long data )
+#endif
 {
     spin_lock_bh(&nfsend_lock);
     //printk(KERN_DEBUG "xt_NAT TIMER: Exporting netflow by timer\n");
@@ -1661,17 +1683,30 @@ static int __init nat_tg_init(void)
     proc_create("statistics", 0644, proc_net_nat, &stat_seq_fops);
 
     spin_lock_bh(&sessions_timer_lock);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+    timer_setup( &sessions_cleanup_timer, sessions_cleanup_timer_callback, 0 );
+#else
     setup_timer( &sessions_cleanup_timer, sessions_cleanup_timer_callback, 0 );
+#endif
     mod_timer( &sessions_cleanup_timer, jiffies + msecs_to_jiffies(10 * 1000) );
     spin_unlock_bh(&sessions_timer_lock);
 
     spin_lock_bh(&users_timer_lock);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+    timer_setup( &users_cleanup_timer, users_cleanup_timer_callback, 0 );
+#else
     setup_timer( &users_cleanup_timer, users_cleanup_timer_callback, 0 );
+#endif
     mod_timer( &users_cleanup_timer, jiffies + msecs_to_jiffies(60 * 1000) );
     spin_unlock_bh(&users_timer_lock);
 
     spin_lock_bh(&nfsend_lock);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+    timer_setup( &nf_send_timer, nf_send_timer_callback, 0 );
+#else
     setup_timer( &nf_send_timer, nf_send_timer_callback, 0 );
+#endif
     mod_timer( &nf_send_timer, jiffies + msecs_to_jiffies(1000) );
     spin_unlock_bh(&nfsend_lock);