Signed-off-by: Isaku Yamahata <yamah...@valinux.co.jp>
---
ryu/lib/packet/packet_base.py | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/ryu/lib/packet/packet_base.py b/ryu/lib/packet/packet_base.py
index 847e5ce..c3f76e3 100644
--- a/ryu/lib/packet/packet_base.py
+++ b/ryu/lib/packet/packet_base.py
@@ -13,9 +13,12 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+import abc
+
class PacketBase(object):
"""A base class for a protocol (ethernet, ipv4, ...) header."""
+ __metaclass__ = abc.ABCMeta
_TYPES = {}
@classmethod
@@ -43,6 +46,7 @@ class PacketBase(object):
return self.__class__.__name__
@classmethod
+ @abc.abstractmethod
def parser(cls, buf):
"""Decode a protocol header.
--
1.7.10.4
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