From e6666353c41de8ad675d4157cdbe848a42ba6385 Mon Sep 17 00:00:00 2001 From: Christian Poessinger Date: Sat, 21 Aug 2021 20:57:17 +0200 Subject: vyos.ifconfig: provide generic get_mac_synthetic() method WireGuard, Tunnel and also PPPoE all need a ways to calculate a synthetic MAC address used for the EUI64 link-local addresses. Instead of copying the code from Tunnel to WireGuard to PPPoE, use a generic implementation. (cherry picked from commit b7d30137b17da49ed5099d4d96659b363fc7bcc9) --- python/vyos/ifconfig/interface.py | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'python/vyos/ifconfig/interface.py') diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py index 9c02af68f..e815c0129 100644 --- a/python/vyos/ifconfig/interface.py +++ b/python/vyos/ifconfig/interface.py @@ -52,6 +52,10 @@ from vyos.ifconfig.vrrp import VRRP from vyos.ifconfig.operational import Operational from vyos.ifconfig import Section +from netaddr import EUI +from netaddr import mac_unix_expanded +from random import getrandbits + class Interface(Control): # This is the class which will be used to create # self.operational, it allows subclasses, such as @@ -367,6 +371,31 @@ class Interface(Control): """ return self.get_interface('mac') + def get_mac_synthetic(self): + """ + Get a synthetic MAC address. This is a common method which can be called + from derived classes to overwrite the get_mac() call in a generic way. + + NOTE: Tunnel interfaces have no "MAC" address by default. The content + of the 'address' file in /sys/class/net/device contains the + local-ip thus we generate a random MAC address instead + + Example: + >>> from vyos.ifconfig import Interface + >>> Interface('eth0').get_mac() + '00:50:ab:cd:ef:00' + """ + # we choose 40 random bytes for the MAC address, this gives + # us e.g. EUI('00-EA-EE-D6-A3-C8') or EUI('00-41-B9-0D-F2-2A') + tmp = EUI(getrandbits(48)).value + # set locally administered bit in MAC address + tmp |= 0xf20000000000 + # convert integer to "real" MAC address representation + mac = EUI(hex(tmp).split('x')[-1]) + # change dialect to use : as delimiter instead of - + mac.dialect = mac_unix_expanded + return str(mac) + def set_mac(self, mac): """ Set interface MAC (Media Access Contrl) address to given value. -- cgit v1.2.3