bf51bb2f8c
Introduce helper function for mac address,
and simplify set_dl_{src, dst}_mask()
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
|
|
# Copyright (C) 2011 Isaku Yamahata <yamahata at valinux co jp>
|
|
#
|
|
# 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 itertools
|
|
|
|
|
|
# Internal representation of mac address is string[6]
|
|
_HADDR_LEN = 6
|
|
|
|
DONTCARE = '\x00' * 6
|
|
BROADCAST = '\xff' * 6
|
|
MULTICAST = '\xfe' + '\xff' * 5
|
|
UNICAST = '\x01' + '\x00' * 5
|
|
|
|
|
|
def is_multicast(addr):
|
|
return bool(ord(addr[0]) & 0x01)
|
|
|
|
|
|
def haddr_to_str(addr):
|
|
"""Format mac address in internal representation into human readable
|
|
form"""
|
|
assert len(addr) == _HADDR_LEN
|
|
return ':'.join('%02x' % ord(char) for char in addr)
|
|
|
|
|
|
def haddr_to_bin(string):
|
|
"""Parse mac address string in human readable format into
|
|
internal representation"""
|
|
hexes = string.split(':')
|
|
if len(hexes) != _HADDR_LEN:
|
|
ValueError('Invalid format for mac address: %s' % string)
|
|
return ''.join(chr(int(h, 16)) for h in hexes)
|
|
|
|
|
|
def haddr_bitand(addr, mask):
|
|
return ''.join(chr(ord(a) & ord(m)) for (a, m)
|
|
in itertools.izip(addr, mask))
|