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#!/usr/bin/env python3
#
# Copyright (C) 2023-2024 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/>.
from sys import exit
from vyos.config import Config
from vyos.configdict import get_frrender_dict
from vyos.configdict import list_diff
from vyos.configverify import has_frr_protocol_in_dict
from vyos.frrender import FRRender
from vyos.ifconfig import Section
from vyos.utils.dict import dict_search
from vyos.utils.system import sysctl_write
from vyos import ConfigError
from vyos import airbag
airbag.enable()
frrender = FRRender()
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
return get_frrender_dict(conf)
def verify(config_dict):
if not has_frr_protocol_in_dict(config_dict, 'segment_routing'):
return None
sr = config_dict['segment_routing']
if 'srv6' in sr:
srv6_enable = False
if 'interface' in sr:
for interface, interface_config in sr['interface'].items():
if 'srv6' in interface_config:
srv6_enable = True
break
if not srv6_enable:
raise ConfigError('SRv6 should be enabled on at least one interface!')
return None
def generate(config_dict):
frrender.generate(config_dict)
return None
def apply(config_dict):
if not has_frr_protocol_in_dict(config_dict, 'segment_routing'):
return None
sr = config_dict['segment_routing']
current_interfaces = Section.interfaces()
sr_interfaces = list(sr.get('interface', {}).keys())
for interface in list_diff(current_interfaces, sr_interfaces):
# Disable processing of IPv6-SR packets
sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '0')
for interface, interface_config in sr.get('interface', {}).items():
# Accept or drop SR-enabled IPv6 packets on this interface
if 'srv6' in interface_config:
sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '1')
# Define HMAC policy for ingress SR-enabled packets on this interface
# It's a redundant check as HMAC has a default value - but better safe
# then sorry
tmp = dict_search('srv6.hmac', interface_config)
if tmp == 'accept':
sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '0')
elif tmp == 'drop':
sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '1')
elif tmp == 'ignore':
sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '-1')
else:
sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '0')
frrender.apply()
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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