vrf: T3734: T3728: vni must be configured with a higher priority then bgpd

When removing bgp (vrf) instances the assigned VRF vni must be deleted from FRR
prior the removal of the bgp settings (T3734).

This is now done by moving the CLI command "set vrf name red vni 1000" to a
dedicated Python script with a priority higher then bgp.

1 files changed, 76 insertions, 0 deletions

diff --git a/src/conf_mode/vrf_vni.py b/src/conf_mode/vrf_vni.py
new file mode 100755
index 000000000..87ee8f2d1
--- /dev/null
+++ b/src/conf_mode/vrf_vni.py
@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020-2021 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 argv
+from sys import exit
+
+from vyos.config import Config
+from vyos.template import render_to_string
+from vyos import ConfigError
+from vyos import frr
+from vyos import airbag
+airbag.enable()
+
+frr_daemon = 'zebra'
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+
+    # This script only works with a passed VRF name
+    if len(argv) < 1:
+        raise NotImplementedError
+    vrf = argv[1]
+
+    # "assemble" dict - easier here then use a full blown get_config_dict()
+    # on a single leafNode
+    vni = { 'vrf' : vrf }
+    tmp = conf.return_value(['vrf', 'name', vrf, 'vni'])
+    if tmp: vni.update({ 'vni' : tmp })
+
+    return vni
+
+def verify(vni):
+    return None
+
+def generate(vni):
+    vni['new_frr_config'] = render_to_string('frr/vrf-vni.frr.tmpl', vni)
+    return None
+
+def apply(vni):
+    # add configuration to FRR
+    frr_cfg = frr.FRRConfig()
+    frr_cfg.load_configuration(frr_daemon)
+    frr_cfg.modify_section(f'^vrf [a-zA-Z-]*$', '')
+    frr_cfg.add_before(r'(interface .*|line vty)', vni['new_frr_config'])
+    frr_cfg.commit_configuration(frr_daemon)
+
+    # Save configuration to /run/frr/config/frr.conf
+    frr.save_configuration()
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)