diff options
| -rw-r--r-- | interface-definitions/system-ipv6.xml.in | 70 | ||||
| -rwxr-xr-x | src/conf_mode/system-ipv6.py | 124 |
2 files changed, 194 insertions, 0 deletions
diff --git a/interface-definitions/system-ipv6.xml.in b/interface-definitions/system-ipv6.xml.in new file mode 100644 index 000000000..623418100 --- /dev/null +++ b/interface-definitions/system-ipv6.xml.in @@ -0,0 +1,70 @@ +<?xml version="1.0"?> +<interfaceDefinition> + <node name="system"> + <children> + <node name="ipv6" owner="${vyos_conf_scripts_dir}/system-ipv6.py"> + <properties> + <help>IPv6 Settings</help> + <priority>290</priority> + </properties> + <children> + <leafNode name="blacklist"> + <properties> + <help>Prevent IPv6 Kernel Module from being loaded</help> + <valueless/> + </properties> + </leafNode> + <leafNode name="disable-forwarding"> + <properties> + <help>Disable IPv6 forwarding on all interfaces</help> + <valueless/> + </properties> + </leafNode> + <leafNode name="disable"> + <properties> + <help>Disable assignment of IPv6 addresses on all interfaces</help> + <valueless/> + </properties> + </leafNode> + <node name="multipath"> + <properties> + <help>IPv4 multipath settings</help> + </properties> + <children> + <leafNode name="layer4-hashing"> + <properties> + <help>Use layer 4 information for ECMP hashing</help> + <valueless/> + </properties> + </leafNode> + </children> + </node> + <node name="neighbor"> + <properties> + <help>Parameters for Neighbor cache</help> + </properties> + <children> + <leafNode name="table-size"> + <properties> + <help>Maximum number of entries to keep in the Neighbor cache</help> + <completionHelp> + <list>1024 2048 4096 8192 16384 32768</list> + </completionHelp> + <constraint> + <regex>(1024|2048|4096|8192|16384|32768)</regex> + </constraint> + </properties> + </leafNode> + </children> + </node> + <leafNode name="strict-dad"> + <properties> + <help>Disable IPv6 operation on interface when DAD fails on LL addr</help> + <valueless/> + </properties> + </leafNode> + </children> + </node> + </children> + </node> +</interfaceDefinition> diff --git a/src/conf_mode/system-ipv6.py b/src/conf_mode/system-ipv6.py new file mode 100755 index 000000000..a39d00f9f --- /dev/null +++ b/src/conf_mode/system-ipv6.py @@ -0,0 +1,124 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2019 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 +import sys + +from sys import exit +from copy import deepcopy +from vyos.config import Config +from vyos import ConfigError + +ipv6_blacklist_file = '/etc/modprobe.d/vyos_blacklist_ipv6.conf' +ipv6_disable_file = '/etc/modprobe.d/vyos_disable_ipv6.conf' + +default_config_data = { + 'blacklist': False, + 'reboot_message': False, + 'ipv6_forward': '1', + 'disable_addr_assignment': False, + 'mp_layer4_hashing': '0', + 'neighbor_cache': 8192, + 'strict_dad': '1' + +} + +def sysctl(name, value): + os.system('sysctl -wq {}={}'.format(name, value)) + +def get_config(): + ip_opt = deepcopy(default_config_data) + conf = Config() + conf.set_level('system ipv6') + if conf.exists(''): + ip_opt['blacklist'] = conf.exists('blacklist') + if conf.exists_effective('blacklist') != conf.exists('blacklist'): + ip_opt['reboot_message'] = True + + ip_opt['disable_addr_assignment'] = conf.exists('disable') + if conf.exists_effective('disable') != conf.exists('disable'): + ip_opt['reboot_message'] = True + + if conf.exists('disable-forwarding'): + ip_opt['ipv6_forward'] = '0' + + if conf.exists('multipath layer4-hashing'): + ip_opt['mp_layer4_hashing'] = '1' + + if conf.exists('neighbor table-size'): + ip_opt['neighbor_cache'] = int(conf.return_value('neighbor table-size')) + + if conf.exists('strict-dad'): + ip_opt['strict_dad'] = 2 + + return ip_opt + +def verify(ip_opt): + pass + +def generate(ip_opt): + pass + +def apply(ip_opt): + # disable IPv6 kernel module + if ip_opt['blacklist']: + with open(ipv6_blacklist_file, 'w') as f: + f.write('blacklist ipv6') + else: + if os.path.exists(ipv6_blacklist_file): + os.unlink(ipv6_blacklist_file) + + # disable IPv6 address assignment + if ip_opt['disable_addr_assignment']: + with open(ipv6_disable_file, 'w') as f: + f.write('options ipv6 disable_ipv6=1') + else: + if os.path.exists(ipv6_disable_file): + os.unlink(ipv6_disable_file) + + if ip_opt['reboot_message']: + print('Changing IPv6 blacklist/disable parameter will only take affect\n' \ + 'when the system is rebooted.') + + # configure multipath + sysctl('net.ipv6.fib_multipath_hash_policy', ip_opt['mp_layer4_hashing']) + + # apply neighbor table threshold values + sysctl('net.ipv6.neigh.default.gc_thresh3', ip_opt['neighbor_cache']) + sysctl('net.ipv6.neigh.default.gc_thresh2', ip_opt['neighbor_cache'] // 2) + sysctl('net.ipv6.neigh.default.gc_thresh1', ip_opt['neighbor_cache'] // 8) + + # enable/disable IPv6 forwarding + with open('/proc/sys/net/ipv6/conf/all/forwarding', 'w') as f: + f.write(ip_opt['ipv6_forward']) + + # configure IPv6 strict-dad + for root, dirs, files in os.walk('/proc/sys/net/ipv6/conf'): + for name in files: + if name == "accept_dad": + print(os.path.join(root, name)) + with open(os.path.join(root, name), 'w') as f: + f.write(str(ip_opt['strict_dad'])) + +if __name__ == '__main__': + try: + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) |