63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
# Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import struct
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from . import packet_base
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from . import vlan
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from . import mpls
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from . import ether_types as ether
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from os_ken.lib import addrconv
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class linuxcooked(packet_base.PacketBase):
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_PACK_STR = '!HHH8sH'
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_MIN_LEN = struct.calcsize(_PACK_STR)
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def __init__(self, pkt_type, arphrd_type, address_length, address,
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proto_type):
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super(linuxcooked, self).__init__()
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self.pkt_type = pkt_type
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self.arphrd_type = arphrd_type
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self.address_length = address_length
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self.address = address
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self.proto_type = proto_type
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@classmethod
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def parser(cls, buf):
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(pkt_type, arphrd_type, address_length, addres,
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proto_type) = struct.unpack_from(cls._PACK_STR, buf)
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l = cls(pkt_type, arphrd_type, address_length, addres, proto_type)
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return (l, linuxcooked.get_packet_type(proto_type),
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buf[linuxcooked._MIN_LEN:])
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@classmethod
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def get_packet_type(cls, type_):
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"""Override method for the ethernet IEEE802.3 Length/Type
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field (self.ethertype).
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If the value of Length/Type field is less than or equal to
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1500 decimal(05DC hexadecimal), it means Length interpretation
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and be passed to the LLC sublayer."""
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if type_ <= ether.ETH_TYPE_IEEE802_3:
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type_ = ether.ETH_TYPE_IEEE802_3
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return cls._TYPES.get(type_)
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# copy vlan _TYPES
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linuxcooked._TYPES = vlan.vlan._TYPES
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linuxcooked.register_packet_type(vlan.vlan, ether.ETH_TYPE_8021Q)
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linuxcooked.register_packet_type(vlan.svlan, ether.ETH_TYPE_8021AD)
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linuxcooked.register_packet_type(mpls.mpls, ether.ETH_TYPE_MPLS)
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