vyos.util: add common helper to load kernel modules

l2tpv3, wireguard, wirelessmodem, nat all require additional Kernel modules
to be present on the system. Each and every interface implemented their own
way of loading a module - by copying code.

Use a generic function, vyos.util.check_kmod() to load any arbitrary kernel
module passed as string or list.

1 files changed, 3 insertions, 9 deletions

diff --git a/src/conf_mode/interfaces-wireguard.py b/src/conf_mode/interfaces-wireguard.py
index c24c9a7ce..982aefa5f 100755
--- a/src/conf_mode/interfaces-wireguard.py
+++ b/src/conf_mode/interfaces-wireguard.py
@@ -25,6 +25,7 @@ from vyos.config import Config
 from vyos.configdict import list_diff
 from vyos.ifconfig import WireGuardIf
 from vyos.util import chown, chmod_750, call
+from vyos.util import check_kmod
 from vyos.validate import is_member, is_ipv6
 from vyos import ConfigError
 
@@ -32,6 +33,7 @@ from vyos import airbag
 airbag.enable()
 
 kdir = r'/config/auth/wireguard'
+k_mod = 'wireguard'
 
 default_config_data = {
     'intfc': '',
@@ -50,14 +52,6 @@ default_config_data = {
     'vrf': ''
 }
 
-def _check_kmod():
-    modules = ['wireguard']
-    for module in modules:
-        if not os.path.exists(f'/sys/module/{module}'):
-            if call(f'modprobe {module}') != 0:
-                raise ConfigError(f'Loading Kernel module {module} failed')
-
-
 def _migrate_default_keys():
     if os.path.exists(f'{kdir}/private.key') and not os.path.exists(f'{kdir}/default/private.key'):
         location = f'{kdir}/default'
@@ -315,7 +309,7 @@ def apply(wg):
 
 if __name__ == '__main__':
     try:
-        _check_kmod()
+        check_kmod(k_mod)
         _migrate_default_keys()
         c = get_config()
         verify(c)