1 files changed, 97 insertions, 0 deletions
diff --git a/src/conf_mode/interfaces-vti.py b/src/conf_mode/interfaces-vti.py
new file mode 100755
index 000000000..6ff23ae59
--- /dev/null
+++ b/src/conf_mode/interfaces-vti.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 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 netifaces import interfaces
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import get_interface_dict
+from vyos.ifconfig import VTIIf
+from vyos.util import dict_search
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+def get_config(config=None):
+    """
+    Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
+    interface name will be added or a deleted flag
+    """
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['interfaces', 'vti']
+    vti = get_interface_dict(conf, base)
+
+    # VTI is more then an interface - we retrieve the "real" configuration from
+    # the IPsec peer configuration which binds this VTI
+    conf.set_level([])
+    vti['ipsec'] = conf.get_config_dict(['vpn', 'ipsec', 'site-to-site', 'peer'],
+                               key_mangling=('-', '_'), get_first_key=True,
+                               no_tag_node_value_mangle=True)
+
+    for peer, peer_config in vti['ipsec'].items():
+        if dict_search('vti.bind', peer_config) == vti['ifname']:
+            vti['remote'] = peer
+            if 'local_address' in peer_config:
+                vti['source_address'] = peer_config['local_address']
+            # we also need to "calculate" a per vti individual key
+            base = 0x900000
+            vti['key'] = base + int(vti['ifname'].lstrip('vti'))
+
+    return vti
+
+def verify(vti):
+    if 'deleted' in vti:
+        return None
+
+    ifname = vti['ifname']
+    found = False
+    for peer, peer_config in vti['ipsec'].items():
+        if dict_search('vti.bind', peer_config) == ifname:
+            found = True
+            # we can now stop processing the for loop
+            break
+    if not found:
+        tmp = vti['ifname']
+        raise ConfigError(f'Interface "{ifname}" not referenced in any VPN configuration!')
+
+    return None
+
+def generate(vti):
+    return None
+
+def apply(vti):
+    if vti['ifname'] in interfaces():
+        # Always delete the VTI interface in advance
+        VTIIf(**vti).remove()
+
+    if 'deleted' not in vti:
+        tmp = VTIIf(**vti)
+        tmp.update(vti)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)