test_oxm: dedicated UTs for oxm_fields module

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/tests/unit/ofproto/test_oxm.py

@@ -0,0 +1,131 @@
+# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
+# Copyright (C) 2015 YAMAMOTO Takashi <yamamoto at valinux co jp>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+import ryu.ofproto.ofproto_v1_3 as ofp
+
+
+class Test_OXM(unittest.TestCase):
+    def _test_encode(self, user, on_wire):
+        (f, uv) = user
+        (n, v, m) = ofp.oxm_from_user(f, uv)
+        buf = bytearray()
+        ofp.oxm_serialize(n, v, m, buf, 0)
+        self.assertEqual(on_wire, buf)
+
+    def _test_decode(self, user, on_wire):
+        (n, v, m, l) = ofp.oxm_parse(on_wire, 0)
+        self.assertEqual(len(on_wire), l)
+        (f, uv) = ofp.oxm_to_user(n, v, m)
+        self.assertEqual(user, (f, uv))
+
+    def _test_encode_header(self, user, on_wire):
+        f = user
+        n = ofp.oxm_from_user_header(f)
+        buf = bytearray()
+        ofp.oxm_serialize_header(n, buf, 0)
+        self.assertEqual(on_wire, buf)
+
+    def _test_decode_header(self, user, on_wire):
+        (n, l) = ofp.oxm_parse_header(on_wire, 0)
+        self.assertEqual(len(on_wire), l)
+        f = ofp.oxm_to_user_header(n)
+        self.assertEqual(user, f)
+
+    def _test(self, user, on_wire, header_bytes):
+        self._test_encode(user, on_wire)
+        self._test_decode(user, on_wire)
+        if isinstance(user[1], tuple):  # has mask?
+            return
+        user_header = user[0]
+        on_wire_header = on_wire[:header_bytes]
+        self._test_decode_header(user_header, on_wire_header)
+        if user_header.startswith('field_'):
+            return  # not supported
+        self._test_encode_header(user_header, on_wire_header)
+
+    def test_basic_nomask(self):
+        user = ('ipv4_src', '192.0.2.1')
+        on_wire = (
+            b'\x80\x00\x16\x04'
+            b'\xc0\x00\x02\x01'
+        )
+        self._test(user, on_wire, 4)
+
+    def test_basic_mask(self):
+        user = ('ipv4_src', ('192.0.2.1', '255.255.0.0'))
+        on_wire = (
+            b'\x80\x00\x17\x08'
+            b'\xc0\x00\x02\x01'
+            b'\xff\xff\x00\x00'
+        )
+        self._test(user, on_wire, 4)
+
+    def test_nxm_1_nomask(self):
+        user = ('tun_ipv4_src', '192.0.2.1')
+        on_wire = (
+            b'\x00\x01\x3e\x04'
+            b'\xc0\x00\x02\x01'
+        )
+        self._test(user, on_wire, 4)
+
+    def test_nxm_1_mask(self):
+        user = ('tun_ipv4_src', ('192.0.2.1', '255.255.0.0'))
+        on_wire = (
+            b'\x00\x01\x3f\x08'
+            b'\xc0\x00\x02\x01'
+            b'\xff\xff\x00\x00'
+        )
+        self._test(user, on_wire, 4)
+
+    def test_ext_256_nomask(self):
+        user = ('pbb_uca', 50)
+        on_wire = (
+            b'\xff\xff\x00\x07'
+            b'\x4f\x4e\x46\x00'  # ONF
+            b'\x0a\x00'
+            b'\x32'
+        )
+        self._test(user, on_wire, 10)
+
+    def test_ext_256_mask(self):
+        user = ('pbb_uca', (50, 51))
+        on_wire = (
+            b'\xff\xff\x01\x08'
+            b'\x4f\x4e\x46\x00'  # ONF
+            b'\x0a\x00'
+            b'\x32'
+            b'\x33'
+        )
+        self._test(user, on_wire, 10)
+
+    def test_basic_unknown_nomask(self):
+        user = ('field_100', 'aG9nZWhvZ2U=')
+        on_wire = (
+            b'\x00\x00\xc8\x08'
+            b'hogehoge'
+        )
+        self._test(user, on_wire, 4)
+
+    def test_basic_unknown_mask(self):
+        user = ('field_100', ('aG9nZWhvZ2U=', 'ZnVnYWZ1Z2E='))
+        on_wire = (
+            b'\x00\x00\xc9\x10'
+            b'hogehoge'
+            b'fugafuga'
+        )
+        self._test(user, on_wire, 4)