use IPDB also to obtain metric and RPF interface

Kernel.py

@@ -355,7 +355,7 @@ class Kernel:
                 if ip_src not in self.routing:
                     self.routing[ip_src] = {}
 
-                iif = self.vif_dic.get(UnicastRouting.check_rpf(ip_src))
+                iif = UnicastRouting.check_rpf(ip_src)
                 self.set_flood_multicast_route(ip_src, ip_dst, iif)
                 self.routing[ip_src][ip_dst] = kernel_entry
                 return kernel_entry

UnicastRouting.py

 import socket
 import ipaddress
-from threading import RLock
 from pyroute2 import IPDB, IPRoute
+
 import Main
+from utils import if_indextoname
 
 
 def get_route(ip_dst: str):
@@ -17,10 +18,12 @@ def check_rpf(ip_dst):
     return UnicastRouting.check_rpf(ip_dst)
 
 
+def get_unicast_info(ip_dst):
+    return UnicastRouting.get_unicast_info(ip_dst)
+
+
 class UnicastRouting(object):
-    ipr = None
     ipdb = None
-    lock = RLock()
 
     def __init__(self):
         UnicastRouting.ipr = IPRoute()
@@ -28,13 +31,25 @@ class UnicastRouting(object):
         self._ipdb = UnicastRouting.ipdb
         self._ipdb.register_callback(UnicastRouting.unicast_changes, mode="post")
 
+
+    # get metrics (routing preference and cost) to IP ip_dst
     @staticmethod
-    def get_route(ip_dst: str):
+    def get_metric(ip_dst: str):
+        (metric_administrative_distance, metric_cost, _, _, mask) = UnicastRouting.get_unicast_info(ip_dst)
+        return (metric_administrative_distance, metric_cost, mask)
 
+    # get output interface IP, used to send data to IP ip_dst
+    # (root interface IP to ip_dst)
+    @staticmethod
+    def check_rpf(ip_dst):
+        # vif index of rpf interface
+        return UnicastRouting.get_unicast_info(ip_dst)[3]
+
+    @staticmethod
+    def get_route(ip_dst: str):
         ip_bytes = socket.inet_aton(ip_dst)
         ip_int = int.from_bytes(ip_bytes, byteorder='big')
         info = None
-        with UnicastRouting.lock:
         ipdb = UnicastRouting.ipdb  # type:IPDB
 
         for mask_len in range(32, 0, -1):
@@ -42,46 +57,59 @@ class UnicastRouting(object):
             ip_dst = socket.inet_ntoa(ip_bytes) + "/" + str(mask_len)
             print(ip_dst)
             if ip_dst in ipdb.routes:
+                print(info)
+                if ipdb.routes[ip_dst]['ipdb_scope'] != 'gc':
                     info = ipdb.routes[ip_dst]
                 break
             else:
                 continue
         if not info:
             print("0.0.0.0/0")
+            if "default" in ipdb.routes:
                 info = ipdb.routes["default"]
         print(info)
         return info
 
-    # get metrics (routing preference and cost) to IP ip_dst
     @staticmethod
-    def get_metric(ip_dst: str):
-        unicast_routing_entry = UnicastRouting.get_route(ip_dst)
-        entry_protocol = unicast_routing_entry["proto"]
-        entry_cost = unicast_routing_entry["priority"]
-        mask = unicast_routing_entry["dst_len"]
-        if entry_cost is None:
-            entry_cost = 0
-        return (entry_protocol, entry_cost, mask)
+    def get_unicast_info(ip_dst):
+        metric_administrative_distance = 0xFFFFFFFF
+        metric_cost = 0xFFFFFFFF
+        rpf_node = ip_dst
+        oif = None
+        mask = 0
+        unicast_route = UnicastRouting.get_route(ip_dst)
+        if unicast_route is not None:
+            oif = unicast_route.get("oif")
+            next_hop = unicast_route["gateway"]
+            multipaths = unicast_route["multipath"]
+            # prefsrc = unicast_route.get("prefsrc")
+
+            # rpf_node = ip_dst if (next_hop is None and prefsrc is not None) else next_hop
+            rpf_node = next_hop if next_hop is not None else ip_dst
+            highest_ip = ipaddress.ip_address("0.0.0.0")
+            for m in multipaths:
+                if m["gateway"] is None:
+                    oif = m.get('oif')
+                    rpf_node = ip_dst
+                    break
+                elif ipaddress.ip_address(m["gateway"]) > highest_ip:
+                    highest_ip = ipaddress.ip_address(m["gateway"])
+                    oif = m.get('oif')
+                    rpf_node = m["gateway"]
 
-    # get output interface IP, used to send data to IP ip_dst
-    # (root interface IP to ip_dst)
-    @staticmethod
-    def check_rpf(ip_dst):
-        # obter index da interface
-        # rpf_interface_index = ipr.get_routes(family=socket.AF_INET, dst=ip)[0]['attrs'][2][1]
-        # interface_name = if_indextoname(rpf_interface_index)
-        # return interface_name
+            metric_administrative_distance = unicast_route["proto"]
+            metric_cost = unicast_route["priority"]
+            metric_cost = metric_cost if metric_cost is not None else 0
+            mask = unicast_route["dst_len"]
 
-        # obter ip da interface de saida
-        rpf_interface_source = UnicastRouting.ipr.get_routes(family=socket.AF_INET, dst=ip_dst)[0]['attrs'][3][1]
-        return rpf_interface_source
+        interface_name = None if oif is None else if_indextoname(int(oif))
+        rpf_if = Main.kernel.vif_name_to_index_dic.get(interface_name)
+        return (metric_administrative_distance, metric_cost, rpf_node, rpf_if, mask)
 
     @staticmethod
     def unicast_changes(ipdb, msg, action):
         print("unicast change?")
         print(action)
-        UnicastRouting.lock.acquire()
-        UnicastRouting.ipdb = ipdb
         if action == "RTM_NEWROUTE" or action == "RTM_DELROUTE":
             print(ipdb.routes)
             mask_len = msg["dst_len"]
@@ -100,12 +128,9 @@ class UnicastRouting(object):
             print(network_address + "/" + str(mask_len))
             subnet = ipaddress.ip_network(network_address + "/" + str(mask_len))
             print(str(subnet))
-            UnicastRouting.lock.release()
             Main.kernel.notify_unicast_changes(subnet)
-        elif action == "RTM_NEWADDR" or action == "RTM_DELADDR":
-            UnicastRouting.lock.release()
-            # TODO ALTERACOES NA INTERFACE
             '''
+        elif action == "RTM_NEWADDR" or action == "RTM_DELADDR":
             print(action)
             print(msg)
             interface_name = None
@@ -115,15 +140,37 @@ class UnicastRouting(object):
                 if key == "IFA_LABEL":
                     interface_name = value
                     break
-
-            Main.kernel.notify_interface_change(interface_name)
-            '''
-        else:
             UnicastRouting.lock.release()
+            try:
+                Main.kernel.notify_interface_changes(interface_name)
+            except:
+                import traceback
+                traceback.print_exc()
+                pass
+        bnet = ipaddress.ip_network("0.0.0.0/0")
+            Main.kernel.notify_unicast_changes(subnet)
+        elif action == "RTM_NEWLINK" or action == "RTM_DELLINK":
+            attrs = msg["attrs"]
+            if_name = None
+            operation = None
+            for (key, value) in attrs:
+                print((key, value))
+                if key == "IFLA_IFNAME":
+                    if_name = value
+                elif key == "IFLA_OPERSTATE":
+                    operation = value
+                if if_name is not None and operation is not None:
+                    break
+            if if_name is not None:
+                print(if_name + ": " + operation)
+            UnicastRouting.lock.release()
+            if operation == 'DOWN':
+                Main.kernel.remove_interface(if_name, igmp=True, pim=True)
+            subnet = ipaddress.ip_network("0.0.0.0/0")
+            Main.kernel.notify_unicast_changes(subnet)
+            '''
 
     def stop(self):
-        if UnicastRouting.ipr:
-            UnicastRouting.ipr.close()
         if UnicastRouting.ipdb:
             UnicastRouting.ipdb = None
         if self._ipdb:

tree/KernelEntry.py

@@ -19,26 +19,12 @@ class KernelEntry:
         self.source_ip = source_ip
         self.group_ip = group_ip
 
-        # CHECK UNICAST ROUTING INFORMATION###################################################
-        # CHOSE RPC INTERFACE
-        # GET RPC TO SOURCE
-        unicast_route = UnicastRouting.get_route(source_ip)
-        next_hop = unicast_route["gateway"]
-        multipaths = unicast_route["multipath"]
-
-        self.rpf_node = next_hop if next_hop is not None else source_ip
-        import ipaddress
-        highest_ip = ipaddress.ip_address("0.0.0.0")
-        for m in multipaths:
-            if m["gateway"] is None:
-                self.rpf_node = source_ip
-                break
-            elif ipaddress.ip_address(m["gateway"]) > highest_ip:
-                highest_ip = ipaddress.ip_address(m["gateway"])
-                self.rpf_node = m["gateway"]
-
-        print("RPF_NODE:", UnicastRouting.get_route(source_ip))
-        print(self.rpf_node == source_ip)
+        # OBTAIN UNICAST ROUTING INFORMATION###################################################
+        (metric_administrative_distance, metric_cost, rpf_node, root_if, mask) = \
+            UnicastRouting.get_unicast_info(source_ip)
+        if root_if is None:
+            raise Exception
+        self.rpf_node = rpf_node
 
         # (S,G) starts IG state
         self._was_olist_null = False
@@ -49,7 +35,7 @@ class KernelEntry:
         self.CHANGE_STATE_LOCK = RLock()
 
         # decide inbound interface based on rpf check
-        self.inbound_interface_index = Main.kernel.vif_dic[self.check_rpf()]
+        self.inbound_interface_index = root_if
 
         self.interface_state = {}  # type: Dict[int, TreeInterface]
         with self.CHANGE_STATE_LOCK:
@@ -69,9 +55,6 @@ class KernelEntry:
         self.timestamp_of_last_state_refresh_message_received = 0
         print('Tree created')
 
-        #self._lock = threading.RLock()
-
-
     def get_inbound_interface_index(self):
         return self.inbound_interface_index
 
@@ -81,10 +64,6 @@ class KernelEntry:
             outbound_indexes[index] = state.is_forwarding()
         return outbound_indexes
 
-    def check_rpf(self):
-        return UnicastRouting.check_rpf(self.source_ip)
-
-
     ################################################
     # Receive (S,G) data packets or control packets
     ################################################
@@ -168,41 +147,10 @@ class KernelEntry:
     def network_update(self):
         # TODO TALVEZ OUTRO LOCK PARA BLOQUEAR ENTRADA DE PACOTES
         with self.CHANGE_STATE_LOCK:
-            '''
-            next_hop = UnicastRouting.get_route(self.source_ip)["gateway"]
-            multipaths = UnicastRouting.get_route(self.source_ip)["multipath"]
-
-            rpf_node = next_hop
-            print("MUL", multipaths)
-            # self.rpf_node = multipaths[0]["gateway"]
-            for m in multipaths:
-                if m["gateway"] is None:
-                    rpf_node = self.source_ip
-                    break
-                else:
-                    rpf_node = m["gateway"]
-            '''
-            unicast_route = UnicastRouting.get_route(self.source_ip)
-            next_hop = unicast_route["gateway"]
-            multipaths = unicast_route["multipath"]
-
-            rpf_node = next_hop if next_hop is not None else self.source_ip
-            import ipaddress
-            highest_ip = ipaddress.ip_address("0.0.0.0")
-            for m in multipaths:
-                if m["gateway"] is None:
-                    rpf_node = self.source_ip
-                    break
-                elif ipaddress.ip_address(m["gateway"]) > highest_ip:
-                    highest_ip = ipaddress.ip_address(m["gateway"])
-                    rpf_node = m["gateway"]
-
-            print("RPF_NODE:", UnicastRouting.get_route(self.source_ip))
 
+            (metric_administrative_distance, metric_cost, rpf_node, new_inbound_interface_index, _) = \
+                UnicastRouting.get_unicast_info(self.source_ip)
 
-            print(self.rpf_node == self.source_ip)
-
-            new_inbound_interface_index = Main.kernel.vif_dic.get(self.check_rpf(), None)
             if new_inbound_interface_index is None:
                 self.delete()
                 return
@@ -210,24 +158,30 @@ class KernelEntry:
                 self.rpf_node = rpf_node
 
                 # get old interfaces
-                old_upstream_interface = self.interface_state[self.inbound_interface_index]
-                old_downstream_interface = self.interface_state[new_inbound_interface_index]
+                old_upstream_interface = self.interface_state.get(self.inbound_interface_index, None)
+                old_downstream_interface = self.interface_state.get(new_inbound_interface_index, None)
 
                 # change type of interfaces
+                if self.inbound_interface_index is not None:
                     new_downstream_interface = TreeInterfaceDownstream(self, self.inbound_interface_index)
                     self.interface_state[self.inbound_interface_index] = new_downstream_interface
+                new_upstream_interface = None
+                if new_inbound_interface_index is not None:
                     new_upstream_interface = TreeInterfaceUpstream(self, new_inbound_interface_index)
                     self.interface_state[new_inbound_interface_index] = new_upstream_interface
                 self.inbound_interface_index = new_inbound_interface_index
 
                 # remove old interfaces
+                if old_upstream_interface is not None:
                     old_upstream_interface.delete(change_type_interface=True)
+                if old_downstream_interface is not None:
                     old_downstream_interface.delete(change_type_interface=True)
 
                 # atualizar tabela de encaminhamento multicast
                 #self._was_olist_null = False
                 self.change()
                 self.evaluate_olist_change()
+                if new_upstream_interface is not None:
                     new_upstream_interface.change_on_unicast_routing(interface_change=True)
             elif self.rpf_node != rpf_node:
                 self.rpf_node = rpf_node
@@ -294,7 +248,7 @@ class KernelEntry:
             #check if removed interface is root interface
             if self.inbound_interface_index == index:
                 self.delete()
-            else:
+            elif index in self.interface_state:
                 self.interface_state.pop(index).delete()
                 self.change()
                 self.evaluate_olist_change()