Support packet filtering for VPCS

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

gns3server/controller/link.py

@@ -26,6 +26,68 @@ import logging
 log = logging.getLogger(__name__)
 
 
+FILTERS = [
+    {
+        "type": "frequency_drop",
+        "name": "Frequency drop",
+        "description": "It will drop everything with a -1 frequency, drop every Nth packet with a positive frequency, or drop nothing",
+        "parameters": [
+            {
+                "name": "Frequency",
+                "minimum": -1,
+                "maximum": 32767,
+                "unit": "th packet"
+            }
+        ]
+    },
+    {
+        "type": "packet_loss",
+        "name": "Packet loss",
+        "description": "The percentage represents the chance for a packet to be lost",
+        "parameters": [
+            {
+                "name": "Frequency",
+                "minimum": 0,
+                "maximum": 100,
+                "unit": "%"
+            }
+        ]
+    },
+    {
+        "type": "delay",
+        "name": "Delay",
+        "description": "Delay packets in milliseconds. You can add jitter in milliseconds (+/-) of the delay",
+        "parameters": [
+            {
+                "name": "Delay",
+                "minimum": 0,
+                "maximum": 32767,
+                "unit": "ms"
+            },
+            {
+                "name": "Jitter",
+                "minimum": 0,
+                "maximum": 32767,
+                "unit": "ms"
+            }
+        ]
+    },
+    {
+        "type": "corrupt",
+        "name": "Corrupt",
+        "description": "The percentage represents the chance for a packet to be corrupt",
+        "parameters": [
+            {
+                "name": "Frequency",
+                "minimum": 0,
+                "maximum": 100,
+                "unit": "%"
+            }
+        ]
+    }
+]
+
+
 class Link:
     """
     Base class for links.
@@ -44,6 +106,32 @@ class Link:
         self._streaming_pcap = None
         self._created = False
         self._link_type = "ethernet"
+        self._filters = {}
+
+    @property
+    def filters(self):
+        """
+        Get an array of filters
+        """
+        return self._filters
+
+    @asyncio.coroutine
+    def update_filters(self, filters):
+        """
+        Modify the filters list.
+
+        Filter with value 0 will be dropped because not active
+        """
+        new_filters = {}
+        for (filter, values) in filters.items():
+            values = [int(v) for v in values]
+            if len(values) != 0 and values[0] != 0:
+                new_filters[filter] = values
+
+        if new_filters != self.filters:
+            self._filters = new_filters
+            if self._created:
+                yield from self.update()
 
     @property
     def created(self):
@@ -127,6 +215,13 @@ class Link:
 
         raise NotImplementedError
 
+    @asyncio.coroutine
+    def update(self):
+        """
+        Update a link
+        """
+        raise NotImplementedError
+
     @asyncio.coroutine
     def delete(self):
         """
@@ -230,6 +325,28 @@ class Link:
         else:
             return None
 
+    def available_filters(self):
+        """
+        Return the list of filters compatible with this link
+
+        :returns: Array of filters
+        """
+        filter_node = self._get_filter_node()
+        if filter_node:
+            return FILTERS
+        return []
+
+    def _get_filter_node(self):
+        """
+        Return the node where the filter will run
+
+        :returns: None if no node support filtering else the node
+        """
+        for node in self._nodes:
+            if node["node"].node_type in ('vpcs', ):
+                return node["node"]
+        return None
+
     def __eq__(self, other):
         if not isinstance(other, Link):
             return False
@@ -253,7 +370,8 @@ class Link:
         if topology_dump:
             return {
                 "nodes": res,
-                "link_id": self._id
+                "link_id": self._id,
+                "filters": self._filters
             }
         return {
             "nodes": res,
@@ -262,5 +380,6 @@ class Link:
             "capturing": self._capturing,
             "capture_file_name": self._capture_file_name,
             "capture_file_path": self.capture_file_path,
-            "link_type": self._link_type
+            "link_type": self._link_type,
+            "filters": self._filters
         }

gns3server/controller/project.py

@@ -665,6 +665,8 @@ class Project:
                 for node_link in link_data["nodes"]:
                     node = self.get_node(node_link["node_id"])
                     yield from link.add_node(node, node_link["adapter_number"], node_link["port_number"], label=node_link.get("label"), dump=False)
+                if "filters" in link_data:
+                    yield from link.update_filters(link_data["filters"])
             for drawing_data in topology.get("drawings", []):
                 yield from self.add_drawing(dump=False, **drawing_data)
 

gns3server/controller/udp_link.py

@@ -62,12 +62,21 @@ class UDPLink(Link):
         response = yield from node2.compute.post("/projects/{}/ports/udp".format(self._project.id))
         self._node2_port = response.json["udp_port"]
 
+        node1_filters = {}
+        node2_filters = {}
+        filter_node = self._get_filter_node()
+        if filter_node == node1:
+            node1_filters = self._filters
+        elif filter_node == node2:
+            node2_filters = self._filters
+
         # Create the tunnel on both side
         self._link_data.append({
             "lport": self._node1_port,
             "rhost": node2_host,
             "rport": self._node2_port,
-            "type": "nio_udp"
+            "type": "nio_udp",
+            "filters": node1_filters
         })
         yield from node1.post("/adapters/{adapter_number}/ports/{port_number}/nio".format(adapter_number=adapter_number1, port_number=port_number1), data=self._link_data[0], timeout=120)
 
@@ -75,7 +84,8 @@ class UDPLink(Link):
             "lport": self._node2_port,
             "rhost": node1_host,
             "rport": self._node1_port,
-            "type": "nio_udp"
+            "type": "nio_udp",
+            "filters": node2_filters
         })
         try:
             yield from node2.post("/adapters/{adapter_number}/ports/{port_number}/nio".format(adapter_number=adapter_number2, port_number=port_number2), data=self._link_data[1], timeout=120)
@@ -85,6 +95,25 @@ class UDPLink(Link):
             raise e
         self._created = True
 
+    @asyncio.coroutine
+    def update(self):
+        if len(self._link_data) == 0:
+            return
+        node1 = self._nodes[0]["node"]
+        node2 = self._nodes[1]["node"]
+        filter_node = self._get_filter_node()
+
+        if node1 == filter_node:
+            adapter_number1 = self._nodes[0]["adapter_number"]
+            port_number1 = self._nodes[0]["port_number"]
+            self._link_data[0]["filters"] = self._filters
+            yield from node1.put("/adapters/{adapter_number}/ports/{port_number}/nio".format(adapter_number=adapter_number1, port_number=port_number1), data=self._link_data[0], timeout=120)
+        elif node2 == filter_node:
+            adapter_number2 = self._nodes[1]["adapter_number"]
+            port_number2 = self._nodes[1]["port_number"]
+            self._link_data[1]["filters"] = self._filters
+            yield from node2.put("/adapters/{adapter_number}/ports/{port_number}/nio".format(adapter_number=adapter_number2, port_number=port_number2), data=self._link_data[1], timeout=221)
+
     @asyncio.coroutine
     def delete(self):
         """