xtables-addons: fix build on 4.19 for xt_DNETMAP and xt_pknock

Backport 2 commits to fix build on 4.19:
3ea761a1ed
2b76b68c65

Signed-off-by: Deng Qingfang <dengqf6@mail2.sysu.edu.cn>

net/xtables-addons/patches/002-build-support-for-Linux-4.15.patch

@@ -0,0 +1,50 @@
+From 2b76b68c65c97fc11409088c3c30993324df8500 Mon Sep 17 00:00:00 2001
+From: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
+Date: Thu, 4 Jan 2018 18:50:50 +0100
+Subject: [PATCH] build: support for Linux 4.15
+
+Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
+---
+ extensions/pknock/xt_pknock.c | 16 +++++++++++++++-
+ 1 file changed, 15 insertions(+), 1 deletion(-)
+
+diff --git a/extensions/pknock/xt_pknock.c b/extensions/pknock/xt_pknock.c
+index 6fbdea4..31d4bc8 100644
+--- a/extensions/pknock/xt_pknock.c
++++ b/extensions/pknock/xt_pknock.c
+@@ -358,10 +358,20 @@ has_logged_during_this_minute(const struct peer *peer)
+  * @r: rule
+  */
+ static void
+-peer_gc(unsigned long r)
++peer_gc(
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
++	struct timer_list *tl
++#else
++	unsigned long r
++#endif
++)
+ {
+ 	unsigned int i;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
++	struct xt_pknock_rule *rule = from_timer(rule, tl, timer);
++#else
+ 	struct xt_pknock_rule *rule = (struct xt_pknock_rule *)r;
++#endif
+ 	struct peer *peer;
+ 	struct list_head *pos, *n;
+ 
+@@ -469,9 +479,13 @@ add_rule(struct xt_pknock_mtinfo *info)
+ 	if (rule->peer_head == NULL)
+ 		goto out;
+ 
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
++	timer_setup(&rule->timer, peer_gc, 0);
++#else
+ 	init_timer(&rule->timer);
+ 	rule->timer.function	= peer_gc;
+ 	rule->timer.data	= (unsigned long)rule;
++#endif
+ 
+ 	rule->status_proc = proc_create_data(info->rule_name, 0, pde,
+ 	                    &pknock_proc_ops, rule);

net/xtables-addons/patches/003-build-add-support-for-Linux-4.18.patch

@@ -0,0 +1,25 @@
+From 3ea761a1ed338241fbc79bef8e433307e108b6cd Mon Sep 17 00:00:00 2001
+From: Jan Engelhardt <jengelh@inai.de>
+Date: Tue, 14 Aug 2018 14:29:30 +0200
+Subject: [PATCH] build: add support for Linux 4.18
+
+---
+ extensions/xt_DNETMAP.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/extensions/xt_DNETMAP.c b/extensions/xt_DNETMAP.c
+index 1b415c3..de7d4ec 100644
+--- a/extensions/xt_DNETMAP.c
++++ b/extensions/xt_DNETMAP.c
+@@ -367,7 +367,11 @@ dnetmap_tg(struct sk_buff *skb, const struct xt_action_param *par)
+ 	__be32 prenat_ip, postnat_ip, prenat_ip_prev;
+ 	const struct xt_DNETMAP_tginfo *tginfo = par->targinfo;
+ 	const struct nf_nat_range *mr = &tginfo->prefix;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
++	struct nf_nat_range2 newrange;
++#else
+ 	struct nf_nat_range newrange;
++#endif
+ 	struct dnetmap_entry *e;
+ 	struct dnetmap_prefix *p;
+ 	__s32 jttl;