BPF filter support

Fix https://github.com/GNS3/gns3-gui/issues/765

gns3server/compute/base_node.py

@@ -605,13 +605,24 @@ class BaseNode:
         yield from self._ubridge_send('bridge reset_packet_filters ' + bridge_name)
         i = 0
         for (filter_type, values) in filters.items():
-            cmd = "bridge add_packet_filter {bridge_name} {filter_name} {filter_type} {filter_value}".format(
-                bridge_name=bridge_name,
-                filter_name="filter" + str(i),
-                filter_type=filter_type,
-                filter_value=" ".join([str(v) for v in values]))
-            yield from self._ubridge_send(cmd)
-            i += 1
+            if isinstance(values[0], str):
+                for line in values[0].split('\n'):
+                    line = line.strip()
+                    cmd = "bridge add_packet_filter {bridge_name} {filter_name} {filter_type} {filter_value}".format(
+                        bridge_name=bridge_name,
+                        filter_name="filter" + str(i),
+                        filter_type=filter_type,
+                        filter_value='"{}" {}'.format(line, " ".join([str(v) for v in values[1:]]))).strip()
+                    yield from self._ubridge_send(cmd)
+                    i += 1
+            else:
+                cmd = "bridge add_packet_filter {bridge_name} {filter_name} {filter_type} {filter_value}".format(
+                    bridge_name=bridge_name,
+                    filter_name="filter" + str(i),
+                    filter_type=filter_type,
+                    filter_value=" ".join([str(v) for v in values]))
+                yield from self._ubridge_send(cmd)
+                i += 1
 
     @asyncio.coroutine
     def _add_ubridge_ethernet_connection(self, bridge_name, ethernet_interface, block_host_traffic=True):