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):

gns3server/controller/link.py

@@ -36,6 +36,7 @@ FILTERS = [
                 "name": "Frequency",
                 "minimum": -1,
                 "maximum": 32767,
+                "type": "int",
                 "unit": "th packet"
             }
         ]
@@ -49,6 +50,7 @@ FILTERS = [
                 "name": "Chance",
                 "minimum": 0,
                 "maximum": 100,
+                "type": "int",
                 "unit": "%"
             }
         ]
@@ -62,13 +64,15 @@ FILTERS = [
                 "name": "Latency",
                 "minimum": 0,
                 "maximum": 32767,
-                "unit": "ms"
+                "unit": "ms",
+                "type": "int"
             },
             {
                 "name": "Jitter (-/+)",
                 "minimum": 0,
                 "maximum": 32767,
-                "unit": "ms"
+                "unit": "ms",
+                "type": "int"
             }
         ]
     },
@@ -81,7 +85,19 @@ FILTERS = [
                 "name": "Chance",
                 "minimum": 0,
                 "maximum": 100,
-                "unit": "%"
+                "unit": "%",
+                "type": "int"
+            }
+        ]
+    },
+    {
+        "type": "bpf",
+        "name": "BPF",
+        "description": "Berkeley Packet Filter (BPF) syntax. This filter will drop any packet matching the expression. Put one filter by line",
+        "parameters": [
+            {
+                "name": "BPF filters",
+                "type": "text"
             }
         ]
     }
@@ -124,8 +140,14 @@ class Link:
         """
         new_filters = {}
         for (filter, values) in filters.items():
-            values = [int(v) for v in values]
-            if len(values) != 0 and values[0] != 0:
+            new_values = []
+            for value in values:
+                if isinstance(value, str):
+                    new_values.append(value.strip("\n "))
+                else:
+                    new_values.append(int(value))
+            values = new_values
+            if len(values) != 0 and values[0] != 0 and values[0] != '':
                 new_filters[filter] = values
 
         if new_filters != self.filters:

tests/compute/test_base_node.py

@@ -139,9 +139,21 @@ def test_update_ubridge_udp_connection(node, async_run):
 
 def test_ubridge_apply_filters(node, async_run):
     filters = {
-        "latency": [10]
+        "latency": [10],
+        "bpf": ["icmp[icmptype] == 8\ntcp src port 53"]
     }
     node._ubridge_send = AsyncioMagicMock()
     async_run(node._ubridge_apply_filters("VPCS-10", filters))
     node._ubridge_send.assert_any_call("bridge reset_packet_filters VPCS-10")
     node._ubridge_send.assert_any_call("bridge add_packet_filter VPCS-10 filter0 latency 10")
+
+
+def test_ubridge_apply_bpf_filters(node, async_run):
+    filters = {
+        "bpf": ["icmp[icmptype] == 8\ntcp src port 53"]
+    }
+    node._ubridge_send = AsyncioMagicMock()
+    async_run(node._ubridge_apply_filters("VPCS-10", filters))
+    node._ubridge_send.assert_any_call("bridge reset_packet_filters VPCS-10")
+    node._ubridge_send.assert_any_call("bridge add_packet_filter VPCS-10 filter0 bpf \"icmp[icmptype] == 8\"")
+    node._ubridge_send.assert_any_call("bridge add_packet_filter VPCS-10 filter1 bpf \"tcp src port 53\"")

tests/controller/test_link.py

@@ -369,9 +369,10 @@ def test_update_filters(async_run, project, compute):
     link.update = AsyncioMagicMock()
     assert link._created
     async_run(link.update_filters({
-        "packet_loss": ["10"],
-        "delay": ["50", "10"],
-        "frequency_drop": ["0"]
+        "packet_loss": [10],
+        "delay": [50, 10],
+        "frequency_drop": [0],
+        "bpf": [" \n  "]
     }))
     assert link.filters == {
         "packet_loss": [10],

tests/controller/test_udp_link.py

@@ -373,11 +373,14 @@ def test_update(async_run, project):
     }, timeout=120)
 
     assert link.created
-    async_run(link.update_filters({"drop": [5]}))
+    async_run(link.update_filters({"drop": [5], "bpf": ["icmp[icmptype] == 8"]}))
     compute1.put.assert_any_call("/projects/{}/vpcs/nodes/{}/adapters/0/ports/4/nio".format(project.id, node1.id), data={
         "lport": 1024,
         "rhost": "192.168.1.2",
         "rport": 2048,
         "type": "nio_udp",
-        "filters": {"drop": [5]}
+        "filters": {
+            "drop": [5],
+            "bpf": ["icmp[icmptype] == 8"]
+        }
     }, timeout=120)