b04e98faa7
A motivation of this change is a better modularity. I.e. Make packet lib independent from ofproto. Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
87 lines
3.0 KiB
Python
87 lines
3.0 KiB
Python
# Copyright (C) 2012 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 . import ether_types as ether
|
|
from ryu.lib import addrconv
|
|
|
|
|
|
class ethernet(packet_base.PacketBase):
|
|
"""Ethernet header encoder/decoder class.
|
|
|
|
An instance has the following attributes at least.
|
|
MAC addresses are represented as a string like '08:60:6e:7f:74:e7'.
|
|
__init__ takes the corresponding args in this order.
|
|
|
|
============== ==================== =====================
|
|
Attribute Description Example
|
|
============== ==================== =====================
|
|
dst destination address 'ff:ff:ff:ff:ff:ff'
|
|
src source address '08:60:6e:7f:74:e7'
|
|
ethertype ether type 0x0800
|
|
============== ==================== =====================
|
|
"""
|
|
|
|
_PACK_STR = '!6s6sH'
|
|
_MIN_LEN = struct.calcsize(_PACK_STR)
|
|
_TYPE = {
|
|
'ascii': [
|
|
'src', 'dst'
|
|
]
|
|
}
|
|
|
|
def __init__(self, dst='ff:ff:ff:ff:ff:ff', src='00:00:00:00:00:00',
|
|
ethertype=ether.ETH_TYPE_IP):
|
|
super(ethernet, self).__init__()
|
|
self.dst = dst
|
|
self.src = src
|
|
self.ethertype = ethertype
|
|
|
|
@classmethod
|
|
def parser(cls, buf):
|
|
dst, src, ethertype = struct.unpack_from(cls._PACK_STR, buf)
|
|
return (cls(addrconv.mac.bin_to_text(dst),
|
|
addrconv.mac.bin_to_text(src), ethertype),
|
|
ethernet.get_packet_type(ethertype),
|
|
buf[ethernet._MIN_LEN:])
|
|
|
|
def serialize(self, payload, prev):
|
|
return struct.pack(ethernet._PACK_STR,
|
|
addrconv.mac.text_to_bin(self.dst),
|
|
addrconv.mac.text_to_bin(self.src),
|
|
self.ethertype)
|
|
|
|
@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
|
|
ethernet._TYPES = vlan.vlan._TYPES
|
|
ethernet.register_packet_type(vlan.vlan, ether.ETH_TYPE_8021Q)
|
|
ethernet.register_packet_type(vlan.svlan, ether.ETH_TYPE_8021AD)
|
|
ethernet.register_packet_type(mpls.mpls, ether.ETH_TYPE_MPLS)
|