extensions: add copyright statements

Add copyright statements to all extensions authored by myself.

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/extensions/libip6t_DNPT.c b/extensions/libip6t_DNPT.c
index 703adf6..a442de6 100644
--- a/extensions/libip6t_DNPT.c
+++ b/extensions/libip6t_DNPT.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdio.h>
 #include <string.h>
 #include <xtables.h>
diff --git a/extensions/libip6t_SNPT.c b/extensions/libip6t_SNPT.c
index 7ed80b2..4f10de0 100644
--- a/extensions/libip6t_SNPT.c
+++ b/extensions/libip6t_SNPT.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdio.h>
 #include <string.h>
 #include <xtables.h>
diff --git a/extensions/libxt_CLASSIFY.c b/extensions/libxt_CLASSIFY.c
index ee0f9e1..e04657a 100644
--- a/extensions/libxt_CLASSIFY.c
+++ b/extensions/libxt_CLASSIFY.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2003-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdio.h>
 #include <xtables.h>
 #include <linux/netfilter/xt_CLASSIFY.h>
diff --git a/extensions/libxt_CT.c b/extensions/libxt_CT.c
index a576a95..c8437b6 100644
--- a/extensions/libxt_CT.c
+++ b/extensions/libxt_CT.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2010-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdio.h>
 #include <string.h>
 #include <xtables.h>
diff --git a/extensions/libxt_RATEEST.c b/extensions/libxt_RATEEST.c
index acdefb9..449ceab 100644
--- a/extensions/libxt_RATEEST.c
+++ b/extensions/libxt_RATEEST.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2008-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
diff --git a/extensions/libxt_addrtype.c b/extensions/libxt_addrtype.c
index e8a8545..e5d3033 100644
--- a/extensions/libxt_addrtype.c
+++ b/extensions/libxt_addrtype.c
@@ -1,4 +1,6 @@
 /* Shared library add-on to iptables to add addrtype matching support 
+ *
+ * Copyright (c) 2003-2013 Patrick McHardy <kaber@trash.net>
  * 
  * This program is released under the terms of GNU GPL */
 #include <stdio.h>
diff --git a/extensions/libxt_policy.c b/extensions/libxt_policy.c
index 54ec229..0a64a80 100644
--- a/extensions/libxt_policy.c
+++ b/extensions/libxt_policy.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2005-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
diff --git a/extensions/libxt_rateest.c b/extensions/libxt_rateest.c
index 185a813..fb24412 100644
--- a/extensions/libxt_rateest.c
+++ b/extensions/libxt_rateest.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2008-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/extensions/libxt_statistic.c b/extensions/libxt_statistic.c
index c23805f..b6ae5f5 100644
--- a/extensions/libxt_statistic.c
+++ b/extensions/libxt_statistic.c
@@ -1,3 +1,7 @@
+/*
+ * Copyright (c) 2006-2013 Patrick McHardy <kaber@trash.net>
+ */
+
 #include <math.h>
 #include <stdio.h>
 #include <string.h>