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

1 files changed, 77 insertions, 0 deletions

diff --git a/python/vyos/configinterface.py b/python/vyos/configinterface.py
new file mode 100644
index 000000000..b0d766b9c
--- /dev/null
+++ b/python/vyos/configinterface.py
@@ -0,0 +1,77 @@
+# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+def set_description(intf, desc):
+    """
+    Sets the interface secription reported usually by SNMP
+    """
+    with open('/sys/class/net/' + intf + '/ifalias', 'w') as f:
+      f.write(desc)
+
+
+def set_arp_cache_timeout(intf, tmoMS):
+    """
+    Configure the ARP cache entry timeout in milliseconds
+    """
+    with open('/proc/sys/net/ipv4/neigh/' + intf + '/base_reachable_time_ms', 'w') as f:
+      f.write(tmoMS)
+
+def set_multicast_querier(intf, enable):
+    """
+    Sets whether the bridge actively runs a multicast querier or not. When a
+    bridge receives a 'multicast host membership' query from another network host,
+    that host is tracked based on the time that the query was received plus the
+    multicast query interval time.
+
+    use enable=1 to enable or enable=0 to disable
+    """
+
+    if int(enable) >= 0 and int(enable) <= 1:
+      with open('/sys/devices/virtual/net/' + intf + '/bridge/multicast_querier', 'w') as f:
+        f.write(str(enable))
+    else:
+      raise ValueError("malformed configuration string on interface {}: enable={}".format(intf, enable))
+
+def set_link_detect(intf, enable):
+    """
+    0 - Allow packets to be received for the address on this interface
+    even if interface is disabled or no carrier.
+
+    1 - Ignore packets received if interface associated with the incoming
+    address is down.
+
+    2 - Ignore packets received if interface associated with the incoming
+    address is down or has no carrier.
+
+    Kernel Source: Documentation/networking/ip-sysctl.txt
+    """
+
+    # Note can't use sysctl it is broken for vif name because of dots
+    # link_filter values:
+    #   0 - always receive
+    #   1 - ignore receive if admin_down
+    #   2 - ignore receive if admin_down or link down
+
+    with open('/proc/sys/net/ipv4/conf/' + intf + '/link_filter', 'w') as f:
+      if enable == True or enable == 1:
+        f.write('2')
+        if os.path.isfile('/usr/bin/vtysh'):
+          os.system('/usr/bin/vtysh -c "configure terminal" -c "interface {}" -c "link-detect"'.format(intf))
+      else:
+        f.write('1')
+        if os.path.isfile('/usr/bin/vtysh'):
+          os.system('/usr/bin/vtysh -c "configure terminal" -c "interface {}" -c "no link-detect"'.format(intf))