From 86550bf89869ca1ee834f514cb90ab7f0acaf9a8 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Fri, 29 Aug 2014 22:05:20 +0900 Subject: packet lib: add linux cooked header support Signed-off-by: FUJITA Tomonori --- ryu/lib/packet/linux.py | 62 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 ryu/lib/packet/linux.py diff --git a/ryu/lib/packet/linux.py b/ryu/lib/packet/linux.py new file mode 100644 index 00000000..0b7d10f2 --- /dev/null +++ b/ryu/lib/packet/linux.py @@ -0,0 +1,62 @@ +# Copyright (C) 2014 Nippon Telegraph and Telephone Corporation. +# +# 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 struct +from . import packet_base +from . import vlan +from . import mpls +from ryu.ofproto import ether +from ryu.lib import addrconv + + +class linuxcooked(packet_base.PacketBase): + _PACK_STR = '!HHH8sH' + _MIN_LEN = struct.calcsize(_PACK_STR) + + def __init__(self, pkt_type, arphrd_type, address_length, address, + proto_type): + super(linuxcooked, self).__init__() + self.pkt_type = pkt_type + self.arphrd_type = arphrd_type + self.address_length = address_length + self.address = address + self.proto_type = proto_type + + @classmethod + def parser(cls, buf): + (pkt_type, arphrd_type, address_length, addres, + proto_type) = struct.unpack_from(cls._PACK_STR, buf) + l = cls(pkt_type, arphrd_type, address_length, addres, proto_type) + return (l, linuxcooked.get_packet_type(proto_type), + buf[linuxcooked._MIN_LEN:]) + + @classmethod + def get_packet_type(cls, type_): + """Override method for the ethernet IEEE802.3 Length/Type + field (self.ethertype). + + If the value of Length/Type field is less than or equal to + 1500 decimal(05DC hexadecimal), it means Length interpretation + and be passed to the LLC sublayer.""" + if type_ <= ether.ETH_TYPE_IEEE802_3: + type_ = ether.ETH_TYPE_IEEE802_3 + return cls._TYPES.get(type_) + + +# copy vlan _TYPES +linuxcooked._TYPES = vlan.vlan._TYPES +linuxcooked.register_packet_type(vlan.vlan, ether.ETH_TYPE_8021Q) +linuxcooked.register_packet_type(vlan.svlan, ether.ETH_TYPE_8021AD) +linuxcooked.register_packet_type(mpls.mpls, ether.ETH_TYPE_MPLS) -- cgit v1.2.3