Ensure that hashret() returns bytes (#3148)

Author: guedou

scapy/layers/lltd.py

@@ -111,8 +111,8 @@ def mysummary(self):
 
     def hashret(self):
         tos, function = self.tos, self.function
-        return "%c%c" % self.answer_hashret.get((tos, function),
-                                                (tos, function))
+        return b"%c%c" % self.answer_hashret.get((tos, function),
+                                                 (tos, function))
 
     def answers(self, other):
         if not isinstance(other, LLTD):

test/scapy/layers/lltd.uts

@@ -20,6 +20,7 @@ assert pkt.dst == pkt.real_dst
 assert pkt.src == pkt.real_src
 assert pkt.tos == 0
 assert pkt.function == 0
+assert pkt.hashret() == b'\xd9\x88\x00\x00'
 
 = Attribute build / dissection
 assert isinstance(LLTDAttribute(), LLTDAttribute)