vrf: T6189: render FRR L3VNI configuration when creating VRF instance

When adding and removing VRF instances on the fly it was noticed that the vni
statement under the VRF instance in FRR vanishes. This was caused by a race
condition which was previously designed to fix another bug.

The wierd design of a Python helper below the VRF tree to only generate the
VNI configuration nodes is now gone and all is rendered in the proper place.

1 files changed, 0 insertions, 103 deletions

diff --git a/src/conf_mode/vrf_vni.py b/src/conf_mode/vrf_vni.py
deleted file mode 100644
index 8dab164d7..000000000
--- a/src/conf_mode/vrf_vni.py
+++ /dev/null
@@ -1,103 +0,0 @@
-#!/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 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()
-
-def get_config(config=None):
-    if config:
-        conf = config
-    else:
-        conf = Config()
-
-    vrf_name = None
-    if len(argv) > 1:
-        vrf_name = argv[1]
-    else:
-        return None
-
-    # Using duplicate L3VNIs makes no sense - it's also forbidden in FRR,
-    # thus VyOS CLI must deny this, too. Instead of getting only the dict for
-    # the requested VRF and den comparing it with depenent VRfs to not have any
-    # duplicate we will just grad ALL VRFs by default but only render/apply
-    # the configuration for the requested VRF - that makes the code easier and
-    # hopefully less error prone
-    vrf = conf.get_config_dict(['vrf'], key_mangling=('-', '_'),
-                               no_tag_node_value_mangle=True,
-                               get_first_key=True)
-
-    # Store name of VRF we are interested in for FRR config rendering
-    vrf.update({'only_vrf' : vrf_name})
-
-    return vrf
-
-def verify(vrf):
-    if not vrf:
-        return
-
-    if len(argv) < 2:
-        raise ConfigError('VRF parameter not specified when valling vrf_vni.py')
-
-    if 'name' in vrf:
-        vni_ids = []
-        for name, vrf_config in vrf['name'].items():
-            # VRF VNI (Virtual Network Identifier) must be unique on the system
-            if 'vni' in vrf_config:
-                if vrf_config['vni'] in vni_ids:
-                    raise ConfigError(f'VRF "{name}" VNI is not unique!')
-                vni_ids.append(vrf_config['vni'])
-
-    return None
-
-def generate(vrf):
-    if not vrf:
-        return
-
-    vrf['new_frr_config'] = render_to_string('frr/zebra.vrf.route-map.frr.j2', vrf)
-    return None
-
-def apply(vrf):
-    frr_daemon = 'zebra'
-
-    # add configuration to FRR
-    frr_cfg = frr.FRRConfig()
-    frr_cfg.load_configuration(frr_daemon)
-    # There is only one VRF inside the dict as we read only one in get_config()
-    if vrf and 'only_vrf' in vrf:
-        vrf_name = vrf['only_vrf']
-        frr_cfg.modify_section(f'^vrf {vrf_name}', stop_pattern='^exit-vrf', remove_stop_mark=True)
-    if vrf and 'new_frr_config' in vrf:
-        frr_cfg.add_before(frr.default_add_before, vrf['new_frr_config'])
-    frr_cfg.commit_configuration(frr_daemon)
-
-    return None
-
-if __name__ == '__main__':
-    try:
-        c = get_config()
-        verify(c)
-        generate(c)
-        apply(c)
-    except ConfigError as e:
-        print(e)
-        exit(1)