macsec: T2023: add initial XML and Python interfaces

1 files changed, 178 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces-macsec.py b/src/conf_mode/interfaces-macsec.py
new file mode 100755
index 000000000..db605295e
--- /dev/null
+++ b/src/conf_mode/interfaces-macsec.py
@@ -0,0 +1,178 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 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/>.
+
+import os
+
+from copy import deepcopy
+from sys import exit
+from netifaces import interfaces
+
+from vyos.ifconfig import MACsecIf
+from vyos.configdict import list_diff
+from vyos.config import Config
+from vyos.validate import is_member
+from vyos import ConfigError
+
+default_config_data = {
+    'address': [],
+    'address_remove': [],
+    'cipher': 'gcm-aes-128',
+    'deleted': False,
+    'description': '',
+    'disable': False,
+    'intf': '',
+    'source_interface': '',
+    'is_bridge_member': False,
+    'vrf': ''
+}
+
+def get_config():
+    macsec = deepcopy(default_config_data)
+    conf = Config()
+
+    # determine tagNode instance
+    if 'VYOS_TAGNODE_VALUE' not in os.environ:
+        raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified')
+
+    macsec['intf'] = os.environ['VYOS_TAGNODE_VALUE']
+
+    # check if we are a member of any bridge
+    macsec['is_bridge_member'] = is_member(conf, macsec['intf'], 'bridge')
+
+    # Check if interface has been removed
+    if not conf.exists('interfaces macsec ' + macsec['intf']):
+        macsec['deleted'] = True
+        return macsec
+
+    # set new configuration level
+    conf.set_level('interfaces macsec ' + macsec['intf'])
+
+    # retrieve configured interface addresses
+    if conf.exists('address'):
+        macsec['address'] = conf.return_values('address')
+
+    # retrieve interface cipher
+    if conf.exists('cipher'):
+        macsec['cipher'] = conf.return_value('cipher')
+
+    # retrieve interface description
+    if conf.exists('description'):
+        macsec['description'] = conf.return_value('description')
+
+    # Disable this interface
+    if conf.exists('disable'):
+        macsec['disable'] = True
+
+    # Physical interface
+    if conf.exists(['source-interface']):
+        macsec['source_interface'] = conf.return_value(['source-interface'])
+
+    # Determine interface addresses (currently effective) - to determine which
+    # address is no longer valid and needs to be removed from the interface
+    eff_addr = conf.return_effective_values('address')
+    act_addr = conf.return_values('address')
+    macsec['address_remove'] = list_diff(eff_addr, act_addr)
+
+    # retrieve VRF instance
+    if conf.exists('vrf'):
+        macsec['vrf'] = conf.return_value('vrf')
+
+    return macsec
+
+def verify(macsec):
+    if macsec['deleted']:
+        if macsec['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{macsec["intf"]}" cannot be deleted as it is a '
+                f'member of bridge "{macsec["is_bridge_member"]}"!'))
+
+        return None
+
+    if not macsec['source_interface']:
+        raise ConfigError((
+            f'Physical source interface must be set for MACsec "{macsec["intf"]}"'))
+
+    if macsec['vrf']:
+        if macsec['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{macsec["vrf"]}" does not exist')
+
+        if macsec['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{macsec["intf"]}" cannot be member of VRF '
+                f'"{macsec["vrf"]}" and bridge "{macsec["is_bridge_member"]}" '
+                f'at the same time!'))
+
+    if macsec['is_bridge_member'] and macsec['address']:
+        raise ConfigError((
+            f'Cannot assign address to interface "{macsec["intf"]}" '
+            f'as it is a member of bridge "{macsec["is_bridge_member"]}"!'))
+
+    return None
+
+def generate(macsec):
+    return None
+
+def apply(macsec):
+    # Remove macsec interface
+    if macsec['deleted']:
+        MACsecIf(macsec['intf']).remove()
+    else:
+        # MACsec interfaces require a configuration when they are added using
+        # iproute2. This static method will provide the configuration
+        # dictionary used by this class.
+        conf = deepcopy(MACsecIf.get_config())
+
+        # Assign MACsec instance configuration parameters to config dict
+        conf['source_interface'] = macsec['source_interface']
+        conf['cipher'] = macsec['cipher']
+
+        # It is safe to "re-create" the interface always, there is a sanity check
+        # that the interface will only be create if its non existent
+        i = MACsecIf(macsec['intf'], **conf)
+
+        # update interface description used e.g. within SNMP
+        i.set_alias(macsec['description'])
+
+        # Configure interface address(es)
+        # - not longer required addresses get removed first
+        # - newly addresses will be added second
+        for addr in macsec['address_remove']:
+            i.del_addr(addr)
+        for addr in macsec['address']:
+            i.add_addr(addr)
+
+        # assign/remove VRF (ONLY when not a member of a bridge,
+        # otherwise 'nomaster' removes it from it)
+        if not macsec['is_bridge_member']:
+            i.set_vrf(macsec['vrf'])
+
+        # disable interface on demand
+        if macsec['disable']:
+            i.set_admin_state('down')
+        else:
+            i.set_admin_state('up')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)