Make sure extension.flags is up to date.

When we retrieve rules from iptables, reapply all parameters from the
entry, so that the (match|target).(m|t)flags get updated. This commit
fixes #22.

Author: ldx

iptc/ip4tc.py

@@ -339,6 +339,10 @@ def get_all_parameters(self):
 
         return params
 
+    def _update_parameters(self):
+        for k, v in self.get_all_parameters().iteritems():
+            self.__setattr__(k, v)
+
     def __setattr__(self, name, value):
         if not name.startswith('_') and name not in dir(self):
             self.parse(name.replace("_", "-"), value)
@@ -421,6 +425,7 @@ def __init__(self, rule, name=None, match=None, revision=None):
         if match:
             ct.memmove(ct.byref(self._match_buf), ct.byref(match), self.size)
             self._update_pointers()
+            self._update_parameters()
         else:
             self.reset()
 
@@ -545,6 +550,7 @@ def __init__(self, rule, name=None, target=None, revision=None):
         if target:
             ct.memmove(ct.byref(self._target_buf), ct.byref(target), self.size)
             self._update_pointers()
+            self._update_parameters()
         else:
             self.reset()