1 files changed, 104 insertions, 0 deletions
diff --git a/src/conf_mode/vrf_vni.py b/src/conf_mode/vrf_vni.py
new file mode 100644
index 000000000..9f33536e5
--- /dev/null
+++ b/src/conf_mode/vrf_vni.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 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.util import dict_search
+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)