def test_simulates_forwards2(self):
o = (Header({'switch': 2, 'port': 1}) |then| forward(2, 2))+\
(Header({'switch': 3, 'port': 1}) |then| forward(3, 2))
r = (Header({'switch': 2, 'port': 1, 'vlan': 2}) |then| forward(2, 2))+\
(Header({'switch': 3, 'port': 1, 'vlan': 2}) |then| forward(3, 2))
self.assertIsNone(sat.simulates_forwards2(topo, o, r))
self.assertIsNotNone(sat.simulates_forwards2(topo, o, r, field='srcmac'))
o = (Header({'switch': 2, 'port': 1, 'vlan': 1}) |then| forward(2, 2))+\
(Header({'switch': 3, 'port': 1, 'vlan': 1}) |then| forward(3, 2))
r = (Header({'switch': 2, 'port': 1, 'vlan': 2}) |then| forward(2, 2))+\
(Header({'switch': 3, 'port': 1, 'vlan': 2}) |then| forward(3, 2))
self.assertIsNone(sat.simulates_forwards2(topo, o, r))
self.assertIsNotNone(sat.simulates_forwards2(topo, o, r, field='srcmac'))
# This is the corner case that demonstrates that we need to restrict
# compiled policies to only one vlan per slice.
o = (Header({'switch': 2, 'port': 1}) |then| forward(2, 2))+\
(Header({'switch': 3, 'port': 1}) |then| forward(3, 2))+\
(Header({'switch': 4, 'port': 1}) |then| forward(4, 2))
r = (Header({'switch': 2, 'port': 1, 'vlan': 1}) |then| forward(2, 2))+\
(Header({'switch': 3, 'port': 1, 'vlan': 1}) |then| forward(3, 2))+\
(Header({'switch': 3, 'port': 1, 'vlan': 2}) |then| forward(3, 2))+\
(Header({'switch': 4, 'port': 1, 'vlan': 2}) |then| forward(4, 2))
self.assertIsNone(sat.simulates_forwards(topo, o, r))
# NOTE: We would really like this to be a failure, but it isn't.
# Therefore, for compiler correctness, we also need one vlan per edge.
self.assertIsNone(sat.simulates_forwards2(topo, o, r))
self.assertIsNotNone(sat.simulates_forwards2(topo, o, r, field='srcmac'))
# And verify that the compilation test finds this failure
self.assertFalse(sat.compiled_correctly(topo, o, r))
def test_forwards(self):
o = Header({'switch': 2}) |then| Action(2, [1])
r = Header({'switch': 2}) |then| Action(2, [1])
self.assertIsNone(sat.simulates_forwards(topo, o, r))
self.assertIsNone(sat.simulates_forwards(topo, r, o))
o = Header({'switch': 2, 'port': 2}) |then| Action(2, [1])
r = Header({'switch': 2, 'port': 2}) |then| Action(2, [1])
self.assertIsNone(sat.simulates_forwards(topo, o, r))
self.assertIsNone(sat.simulates_forwards(topo, r, o))
o = Header({'switch': 2, 'port': 2}) |then| Action(2, [1])
r = Header({'switch': 2, 'port': 2, 'vlan': 2}) |then| Action(2, [1])
self.assertIsNone(sat.simulates_forwards(topo, o, r))
self.assertIsNone(sat.simulates_forwards(topo, r, o))
o = Header({'switch': 2, 'port': 2}) |then| forward(2, 1)
r = Header({'switch': 2, 'port': 2, 'vlan': 2}) |then| Action(2, [1], {'vlan': 2})
self.assertIsNone(sat.simulates_forwards(topo, o, r))
self.assertIsNone(sat.simulates_forwards(topo, r, o))
o = Header({'switch': 0, 'port': 1}) |then| Action(0, [1])
r = Header({'switch': 0, 'port': 1, 'vlan': 1}) |then| Action(0, [1], {'vlan': 1})
self.assertIsNone(sat.simulates_forwards(topo, o, r))
self.assertIsNone(sat.simulates_forwards(topo, r, o))
o = Header({'switch': 0, 'port': 1, 'srcmac': 32432, 'dstmac': 324322}) |then| Action(0, [1])
r = Header({'switch': 0, 'port': 1, 'srcmac': 32432, 'dstmac': 324322, 'vlan': 1}) |then| Action(0, [1], {'vlan': 1})
self.assertIsNone(sat.simulates_forwards(topo, o, r))
self.assertIsNone(sat.simulates_forwards(topo, r, o))