[bridge] T1156: first working implementation using Python and XML

1 files changed, 227 insertions, 0 deletions

diff --git a/src/conf_mode/interface-bridge.py b/src/conf_mode/interface-bridge.py
new file mode 100755
index 000000000..f7f70b15d
--- /dev/null
+++ b/src/conf_mode/interface-bridge.py
@@ -0,0 +1,227 @@
+#!/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
+import copy
+import subprocess
+
+import vyos.configinterface as VyIfconfig
+
+from vyos.config import Config
+from vyos import ConfigError
+
+default_config_data = {
+    'address': [],
+    'aging': '300',
+    'br_name': '',
+    'description': '',
+    'deleted': False,
+    'dhcp_client_id': '',
+    'dhcp_hostname': '',
+    'dhcpv6_parameters_only': False,
+    'dhcpv6_temporary': False,
+    'disable': False,
+    'disable_link_detect': False,
+    'forwarding_delay': '15',
+    'hello_time': '2',
+    'igmp_querier': 0,
+    'arp_cache_timeout_ms': '30000',
+    'mac' : '',
+    'max_age': '20',
+    'priority': '32768',
+    'stp': 'off'
+}
+
+def subprocess_cmd(command):
+    process = subprocess.Popen(command,stdout=subprocess.PIPE, shell=True)
+    proc_stdout = process.communicate()[0].strip()
+    print(proc_stdout)
+
+def get_config():
+    bridge = copy.deepcopy(default_config_data)
+    conf = Config()
+
+    # determine tagNode instance
+    try:
+        bridge['br_name'] = os.environ['VYOS_TAGNODE_VALUE']
+        print("Executing script for interface: " + bridge['br_name'])
+    except KeyError as E:
+        print("Interface not specified")
+
+    # Check if bridge has been removed
+    if not conf.exists('interfaces bridge ' + bridge['br_name']):
+        bridge['deleted'] = True
+        return bridge
+
+    # set new configuration level
+    conf.set_level('interfaces bridge ' + bridge['br_name'])
+
+    # retrieve configured interface addresses
+    if conf.exists('address'):
+        bridge['address'] = conf.return_values('address')
+
+    # retrieve aging - how long addresses are retained
+    if conf.exists('aging'):
+        bridge['aging'] = conf.return_value('aging')
+
+    # retrieve interface description
+    if conf.exists('description'):
+        bridge['description'] = conf.return_value('description')
+
+    # DHCP client identifier
+    if conf.exists('dhcp-options client-id'):
+        bridge['dhcp_client_id'] = conf.return_value('dhcp-options client-id')
+
+    # DHCP client hostname
+    if conf.exists('dhcp-options host-name'):
+        bridge['dhcp_hostname'] = conf.return_value('dhcp-options host-name')
+
+    # DHCPv6 acquire only config parameters, no address
+    if conf.exists('dhcpv6-options parameters-only'):
+        bridge['dhcpv6_parameters_only'] = True
+
+    # DHCPv6 IPv6 "temporary" address
+    if conf.exists('dhcpv6-options temporary'):
+        bridge['dhcpv6_temporary'] = True
+
+    # Disable this bridge interface
+    if conf.exists('disable'):
+        bridge['disable'] = True
+
+    # Ignore link state changes
+    if conf.exists('disable-link-detect'):
+        bridge['disable_link_detect'] = True
+
+    # Forwarding delay
+    if conf.exists('forwarding-delay'):
+        bridge['forwarding_delay'] = conf.return_value('forwarding-delay')
+
+    # Hello packet advertisment interval
+    if conf.exists('hello-time'):
+        bridge['hello_time'] = conf.return_value('hello-time')
+
+    # Enable or disable IGMP querier
+    if conf.exists('igmp-snooping querier'):
+        tmp = conf.return_value('igmp-snooping querier')
+        if tmp == "enable":
+            bridge['igmp_querier'] = 1
+
+    # ARP cache entry timeout in seconds
+    if conf.exists('ip arp-cache-timeout'):
+        tmp = 1000 * int(conf.return_value('ip arp-cache-timeout'))
+        bridge['arp_cache_timeout_ms'] = str(tmp)
+
+    # Media Access Control (MAC) address
+    if conf.exists('mac'):
+        bridge['mac'] = conf.return_value('mac')
+
+    # Interval at which neighbor bridges are removed
+    if conf.exists('max-age'):
+        bridge['max_age'] = conf.return_value('max-age')
+
+    # Priority for this bridge
+    if conf.exists('priority'):
+        bridge['priority'] = conf.return_value('priority')
+
+    # Enable spanning tree protocol
+    if conf.exists('stp'):
+        tmp = conf.return_value('stp')
+        if tmp == "true":
+            bridge['stp'] = 'on'
+
+    return bridge
+
+def verify(bridge):
+    if bridge is None:
+        return None
+
+    return None
+
+def generate(bridge):
+    if bridge is None:
+        return None
+
+    return None
+
+def apply(bridge):
+    if bridge is None:
+        return None
+
+    if bridge['deleted']:
+        # bridges need to be shutdown first
+        os.system("ip link set dev {0} down".format(bridge['br_name']))
+        # delete bridge
+        os.system("brctl delbr {0}".format(bridge['br_name']))
+    else:
+        # create bridge if it does not exist
+        if not os.path.exists("/sys/class/net/" + bridge['br_name']):
+            os.system("brctl addbr {0}".format(bridge['br_name']))
+
+        # assemble bridge configuration
+        # configuration is passed via subprocess to brctl
+        cmd = ''
+
+        # set ageing time
+        cmd += 'brctl setageing {0} {1}'.format(bridge['br_name'], bridge['aging'])
+        cmd += ' && '
+
+        # set bridge forward delay
+        cmd += 'brctl setfd {0} {1}'.format(bridge['br_name'], bridge['forwarding_delay'])
+        cmd += ' && '
+
+        # set hello time
+        cmd += 'brctl sethello {0} {1}'.format(bridge['br_name'], bridge['hello_time'])
+        cmd += ' && '
+
+        # set max message age
+        cmd += 'brctl setmaxage {0} {1}'.format(bridge['br_name'], bridge['max_age'])
+        cmd += ' && '
+
+        # set bridge priority
+        cmd += 'brctl setbridgeprio {0} {1}'.format(bridge['br_name'], bridge['priority'])
+        cmd += ' && '
+
+        # turn stp on/off
+        cmd += 'brctl stp {0} {1}'.format(bridge['br_name'], bridge['stp'])
+
+        subprocess_cmd(cmd)
+
+        # update interface description used e.g. within SNMP
+        VyIfconfig.set_description(bridge['br_name'], bridge['description'])
+
+        # Ignore link state changes?
+        VyIfconfig.set_link_detect(bridge['br_name'], bridge['disable_link_detect'])
+
+        # enable or disable IGMP querier
+        VyIfconfig.set_multicast_querier(bridge['br_name'], bridge['igmp_querier'])
+
+        # ARP cache entry timeout in seconds
+        VyIfconfig.set_arp_cache_timeout(bridge['br_name'], bridge['arp_cache_timeout_ms'])
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        sys.exit(1)