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# Copyright (C) 2013 Stratosphere Inc.
#
# 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 abc
import logging
from os_ken.lib.packet import packet
LOG = logging.getLogger(__name__)
def packet_in_filter(cls, args=None, logging=False):
def _packet_in_filter(packet_in_handler):
def __packet_in_filter(self, ev):
pkt = packet.Packet(ev.msg.data)
if not packet_in_handler.pkt_in_filter.filter(pkt):
if logging:
LOG.debug('The packet is discarded by %s: %s', cls, pkt)
return
return packet_in_handler(self, ev)
pkt_in_filter = cls(args)
packet_in_handler.pkt_in_filter = pkt_in_filter
return __packet_in_filter
return _packet_in_filter
class PacketInFilterBase(object, metaclass=abc.ABCMeta):
def __init__(self, args):
self.args = args
@abc.abstractmethod
def filter(self, pkt):
pass
class RequiredTypeFilter(PacketInFilterBase):
def filter(self, pkt):
required_types = self.args.get('types') or []
for required_type in required_types:
if not pkt.get_protocol(required_type):
return False
return True
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