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interfaces_wwan.py
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interfaces_wwan.py
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#!/usr/bin/env python3
#
# Copyright (C) 2020-2022 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from time import sleep
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.configdict import is_node_changed
from vyos.configverify import verify_authentication
from vyos.configverify import verify_interface_exists
from vyos.configverify import verify_mirror_redirect
from vyos.configverify import verify_vrf
from vyos.ifconfig import WWANIf
from vyos.utils.dict import dict_search
from vyos.utils.process import cmd
from vyos.utils.process import call
from vyos.utils.process import DEVNULL
from vyos.utils.process import is_systemd_service_active
from vyos.utils.file import write_file
from vyos import ConfigError
from vyos import airbag
airbag.enable()
service_name = 'ModemManager.service'
cron_script = '/etc/cron.d/vyos-wwan'
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'wwan']
ifname, wwan = get_interface_dict(conf, base)
# We should only terminate the WWAN session if critical parameters change.
# All parameters that can be changed on-the-fly (like interface description)
# should not lead to a reconnect!
tmp = is_node_changed(conf, base + [ifname, 'address'])
if tmp: wwan.update({'shutdown_required': {}})
tmp = is_node_changed(conf, base + [ifname, 'apn'])
if tmp: wwan.update({'shutdown_required': {}})
tmp = is_node_changed(conf, base + [ifname, 'disable'])
if tmp: wwan.update({'shutdown_required': {}})
tmp = is_node_changed(conf, base + [ifname, 'vrf'])
if tmp: wwan.update({'shutdown_required': {}})
tmp = is_node_changed(conf, base + [ifname, 'authentication'])
if tmp: wwan.update({'shutdown_required': {}})
tmp = is_node_changed(conf, base + [ifname, 'ipv6', 'address', 'autoconf'])
if tmp: wwan.update({'shutdown_required': {}})
# We need to know the amount of other WWAN interfaces as ModemManager needs
# to be started or stopped.
wwan['other_interfaces'] = conf.get_config_dict([], key_mangling=('-', '_'),
get_first_key=True,
no_tag_node_value_mangle=True)
# This if-clause is just to be sure - it will always evaluate to true
if ifname in wwan['other_interfaces']:
del wwan['other_interfaces'][ifname]
if len(wwan['other_interfaces']) == 0:
del wwan['other_interfaces']
return wwan
def verify(wwan):
if 'deleted' in wwan:
return None
ifname = wwan['ifname']
if not 'apn' in wwan:
raise ConfigError(f'No APN configured for "{ifname}"!')
verify_interface_exists(ifname)
verify_authentication(wwan)
verify_vrf(wwan)
verify_mirror_redirect(wwan)
return None
def generate(wwan):
if 'deleted' in wwan:
# We are the last WWAN interface - there are no other ones remaining
# thus the cronjob needs to go away, too
if 'other_interfaces' not in wwan:
if os.path.exists(cron_script):
os.unlink(cron_script)
return None
# Install cron triggered helper script to re-dial WWAN interfaces on
# disconnect - e.g. happens during RF signal loss. The script watches every
# WWAN interface - so there is only one instance.
if not os.path.exists(cron_script):
write_file(cron_script, '*/5 * * * * root /usr/libexec/vyos/vyos-check-wwan.py\n')
return None
def apply(wwan):
# ModemManager is required to dial WWAN connections - one instance is
# required to serve all modems. Activate ModemManager on first invocation
# of any WWAN interface.
if not is_systemd_service_active(service_name):
cmd(f'systemctl start {service_name}')
counter = 100
# Wait until a modem is detected and then we can continue
while counter > 0:
counter -= 1
tmp = cmd('mmcli -L')
if tmp != 'No modems were found':
break
sleep(0.250)
if 'shutdown_required' in wwan:
# we only need the modem number. wwan0 -> 0, wwan1 -> 1
modem = wwan['ifname'].lstrip('wwan')
base_cmd = f'mmcli --modem {modem}'
# Number of bearers is limited - always disconnect first
cmd(f'{base_cmd} --simple-disconnect')
w = WWANIf(wwan['ifname'])
if 'deleted' in wwan or 'disable' in wwan:
w.remove()
# We are the last WWAN interface - there are no other WWAN interfaces
# remaining, thus we can stop ModemManager and free resources.
if 'other_interfaces' not in wwan:
cmd(f'systemctl stop {service_name}')
# Clean CRON helper script which is used for to re-connect when
# RF signal is lost
if os.path.exists(cron_script):
os.unlink(cron_script)
return None
if 'shutdown_required' in wwan:
ip_type = 'ipv4'
slaac = dict_search('ipv6.address.autoconf', wwan) != None
if 'address' in wwan:
if 'dhcp' in wwan['address'] and ('dhcpv6' in wwan['address'] or slaac):
ip_type = 'ipv4v6'
elif 'dhcpv6' in wwan['address'] or slaac:
ip_type = 'ipv6'
elif 'dhcp' in wwan['address']:
ip_type = 'ipv4'
options = f'ip-type={ip_type},apn=' + wwan['apn']
if 'authentication' in wwan:
options += ',user={username},password={password}'.format(**wwan['authentication'])
command = f'{base_cmd} --simple-connect="{options}"'
call(command, stdout=DEVNULL)
w.update(wwan)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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