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vpp_interfaces_loopback.py
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vpp_interfaces_loopback.py
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#!/usr/bin/env python3
#
# Copyright (C) VyOS Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import os
from vyos import ConfigError
from vyos.config import Config
from vyos.configdict import leaf_node_changed
from vyos.configdep import set_dependents, call_dependents
from vyos.template import is_interface
from vyos.vpp.interface import LoopbackInterface
from vyos.vpp.config_verify import (
verify_vpp_remove_kernel_interface,
verify_vpp_change_kernel_interface,
verify_vpp_exists_kernel_interface,
)
from vyos.vpp.utils import cli_ifaces_lcp_kernel_list
def get_config(config=None) -> dict:
"""Get Loopback interface configuration
Args:
config (vyos.config.Config, optional): The VyOS configuration dictionary
Returns:
dict: Loopback interface configuration
"""
if config:
conf = config
else:
conf = Config()
base = ['vpp', 'interfaces', 'loopback']
base_kernel_interfaces = ['vpp', 'kernel-interfaces']
ifname = os.environ['VYOS_TAGNODE_VALUE']
# Get config_dict with default values
config = conf.get_config_dict(
base + [ifname],
key_mangling=('-', '_'),
get_first_key=True,
no_tag_node_value_mangle=True,
with_defaults=True,
with_recursive_defaults=True,
)
if not conf.exists(['vpp']):
config['remove_vpp'] = True
return config
# Get effective config as we need full dicitonary per interface delete
effective_config = conf.get_config_dict(
base + [ifname],
key_mangling=('-', '_'),
effective=True,
get_first_key=True,
no_tag_node_value_mangle=True,
)
if effective_config:
config.update({'effective': effective_config})
if not conf.exists(base + [ifname]):
config['remove'] = True
# Get global 'vpp kernel-interfaces' for verify
config['vpp_kernel_interfaces'] = conf.get_config_dict(
base_kernel_interfaces,
key_mangling=('-', '_'),
get_first_key=True,
no_tag_node_value_mangle=True,
)
tmp = leaf_node_changed(conf, base + [ifname, 'kernel-interface'])
if tmp:
config['kernel_interface_removed'] = tmp
# list of all kernel interfaces `vpp interface xxx kernel-interface xxx`
config['candidate_kernel_interfaces'] = cli_ifaces_lcp_kernel_list(conf)
# Dependency
if effective_config.get('kernel_interface'):
if conf.exists(base + [ifname, 'kernel-interface']):
iface = config.get('kernel_interface')
if conf.exists(['vpp', 'kernel-interfaces', iface]):
set_dependents('vpp_kernel_interface', conf, iface)
# NAT dependency
if conf.exists(['vpp', 'nat44']):
set_dependents('vpp_nat', conf)
if conf.exists(['vpp', 'nat', 'cgnat']):
set_dependents('vpp_nat_cgnat', conf)
# ACL dependency
if conf.exists(['vpp', 'acl']):
set_dependents('vpp_acl', conf)
config['ifname'] = ifname
return config
def verify(config):
# No need to verify anything if vpp is removed
if 'remove_vpp' in config:
return None
verify_vpp_remove_kernel_interface(config)
if 'remove' in config:
return None
verify_vpp_change_kernel_interface(config)
verify_vpp_exists_kernel_interface(config)
def generate(config):
pass
def apply(config):
if 'remove_vpp' in config:
return None
ifname = config.get('ifname')
# Delete interface
if 'effective' in config:
i = LoopbackInterface(ifname)
i.delete()
if 'remove' in config:
return None
# Add interface
kernel_interface = config.get('kernel_interface', '')
state = 'up' if 'disable' not in config else 'down'
i = LoopbackInterface(ifname, kernel_interface, state)
i.add()
# Add kernel-interface (LCP) if interface is not exist
if 'kernel_interface' in config and not is_interface(kernel_interface):
i.kernel_add()
call_dependents()
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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