conntrack: add some __slots__ attribute to reduce memory usage

pyroute2/conntrack.py

@@ -9,6 +9,9 @@ from pyroute2.netlink.nfnetlink.nfctsocket import NFCTSocket
 
 class NFCTATcpProtoInfo(object):
 
+    __slots__ = ('state', 'wscale_orig', 'wscale_reply', 'flags_orig',
+                 'flags_reply')
+
     def __init__(self, state, wscale_orig=None, wscale_reply=None,
                  flags_orig=None, flags_reply=None):
         self.state = state
@@ -49,6 +52,9 @@ class NFCTATcpProtoInfo(object):
 
 class ConntrackEntry(object):
 
+    __slots__ = ('tuple_orig', 'tuple_reply', 'status', 'timeout',
+                 'protoinfo', 'mark', 'id', 'use')
+
     def __init__(self, family, tuple_orig, tuple_reply, cta_status,
                  cta_timeout, cta_protoinfo, cta_mark, cta_id, cta_use):
         self.tuple_orig = NFCTAttrTuple.from_netlink(family, tuple_orig)

pyroute2/netlink/nfnetlink/nfctsocket.py

@@ -367,6 +367,11 @@ class NFCTAttr(object):
 
 
 class NFCTAttrTuple(NFCTAttr):
+
+    __slots__ = ('saddr', 'daddr', 'proto', 'sport', 'dport',
+                 'icmp_id', 'icmp_type', 'family', '_attr_ip',
+                 '_attr_icmp')
+
     def __init__(self, family=socket.AF_INET,
                  saddr=None, daddr=None, proto=None, sport=None, dport=None,
                  icmp_id=None, icmp_type=None, icmp_code=None):