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# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
from vyos.configtree import ConfigTree
def replace_nat_interfaces(config, old, new):
if not config.exists(['nat']):
return
for direction in ['destination', 'source']:
conf_direction = ['nat', direction, 'rule']
if not config.exists(conf_direction):
return
for rule in config.list_nodes(conf_direction):
conf_rule = conf_direction + [rule]
if config.exists(conf_rule + ['inbound-interface']):
tmp = config.return_value(conf_rule + ['inbound-interface'])
if tmp == old:
config.set(conf_rule + ['inbound-interface'], value=new)
if config.exists(conf_rule + ['outbound-interface']):
tmp = config.return_value(conf_rule + ['outbound-interface'])
if tmp == old:
config.set(conf_rule + ['outbound-interface'], value=new)
def migrate(config: ConfigTree) -> None:
base = ['interfaces', 'wirelessmodem']
if not config.exists(base):
# Nothing to do
return
new_base = ['interfaces', 'wwan']
config.set(new_base)
config.set_tag(new_base)
for old_interface in config.list_nodes(base):
# convert usb0b1.3p1.2 device identifier and extract 1.3 usb bus id
usb = config.return_value(base + [old_interface, 'device'])
device = usb.split('b')[-1]
busid = device.split('p')[0]
for new_interface in os.listdir('/sys/class/net'):
# we are only interested in interfaces starting with wwan
if not new_interface.startswith('wwan'):
continue
device = os.readlink(f'/sys/class/net/{new_interface}/device')
device = device.split(':')[0]
if busid in device:
config.copy(base + [old_interface], new_base + [new_interface])
replace_nat_interfaces(config, old_interface, new_interface)
config.delete(base)
# Now that we have copied the old wirelessmodem interfaces to wwan
# we can start to migrate also individual config items.
for interface in config.list_nodes(new_base):
# we do no longer need the USB device name
config.delete(new_base + [interface, 'device'])
# set/unset DNS configuration
dns = new_base + [interface, 'no-peer-dns']
if config.exists(dns):
config.delete(dns)
else:
config.set(['system', 'name-servers-dhcp'], value=interface, replace=False)
# Backup distance is now handled by DHCP option "default-route-distance"
distance = dns = new_base + [interface, 'backup', 'distance']
old_default_distance = '10'
if config.exists(distance):
old_default_distance = config.return_value(distance)
config.delete(distance)
config.set(new_base + [interface, 'dhcp-options', 'default-route-distance'], value=old_default_distance)
# the new wwan interface use regular IP addressing
config.set(new_base + [interface, 'address'], value='dhcp')
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