1 files changed, 112 insertions, 0 deletions
diff --git a/src/conf_mode/vpp_interfaces_loopback.py b/src/conf_mode/vpp_interfaces_loopback.py
new file mode 100644
index 000000000..2f7b59354
--- /dev/null
+++ b/src/conf_mode/vpp_interfaces_loopback.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) VyOS Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# 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, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+from vyos import ConfigError
+
+from vyos.config import Config
+from vyos.configdict import get_interface_dict
+from vyos.configdep import set_dependents, call_dependents
+from vyos.utils.process import is_systemd_service_active
+
+from vyos.ifconfig.vpp import VPPLoopbackInterface
+
+
+def get_config(config=None) -> dict:
+    """Get Loopback interface configuration
+
+    Args:
+        config (vyos.config.Config, optional): The VyOS configuration dictionary
+    Returns:
+        dict: Loopback interface configuration
+    """
+    if config:
+        conf = config
+    else:
+        conf = Config()
+
+    base = ['interfaces', 'vpp', 'loopback']
+
+    ifname, config = get_interface_dict(conf, base)
+
+    if not conf.exists(['vpp']) and not conf.exists(base):
+        config['remove_vpp'] = True
+        return config
+
+    # Get 'vpp settings' config
+    config['vpp_settings'] = conf.get_config_dict(
+        ['vpp', 'settings'],
+        key_mangling=('-', '_'),
+        get_first_key=True,
+        no_tag_node_value_mangle=True,
+    )
+
+    # NAT dependency
+    if conf.exists(['vpp', 'nat', 'nat44']):
+        set_dependents('vpp_nat_nat44', conf)
+    if conf.exists(['vpp', 'nat', 'cgnat']):
+        set_dependents('vpp_nat_cgnat', conf)
+
+    # ACL dependency
+    if conf.exists(['vpp', 'acl']):
+        set_dependents('vpp_acl', conf)
+
+    return config
+
+
+def verify(config):
+    # No need to verify anything if vpp is removed
+    if 'remove_vpp' in config:
+        return None
+
+    if not is_systemd_service_active('vpp.service'):
+        raise ConfigError(
+            'Cannot configure VPP loopback interface: vpp.service is not running'
+        )
+
+
+def generate(config):
+    pass
+
+
+def apply(config):
+    if 'remove_vpp' in config:
+        return None
+
+    ifname = config.get('ifname')
+    loopback = VPPLoopbackInterface(ifname, config)
+    loopback.remove()
+
+    if 'deleted' in config:
+        return
+
+    loopback.update(config)
+
+    call_dependents()
+
+    return None
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)