wireless: T6318: move country-code to a system wide configuration

Wireless devices are subject to regulations issued by authorities. For any
given AP or router, there will most likely be no case where one wireless NIC is
located in one country and another wireless NIC in the same device is located
in another country, resulting in different regulatory domains to apply to the
same box.

Currently, wireless regulatory domains in VyOS need to be configured per-NIC:
  set interfaces wireless wlan0 country-code us

This leads to several side-effects:
* When operating multiple WiFi NICs, they all can have different regulatory
  domains configured which might offend legislation.
* Some NICs need additional entries to /etc/modprobe.d/cfg80211.conf to apply
  regulatory domain settings, such as: "options cfg80211 ieee80211_regdom=US"
  This is true for the Compex WLE600VX. This setting cannot be done
  per-interface.

Migrate the first found wireless module country-code from the wireless
interface CLI to: "system wireless country-code"

2 files changed, 73 insertions, 2 deletions

diff --git a/src/conf_mode/interfaces_wireless.py b/src/conf_mode/interfaces_wireless.py
index c0a17c0bc..998ff9dba 100755
--- a/src/conf_mode/interfaces_wireless.py
+++ b/src/conf_mode/interfaces_wireless.py
@@ -44,6 +44,8 @@ hostapd_conf = '/run/hostapd/{ifname}.conf'
 hostapd_accept_station_conf = '/run/hostapd/{ifname}_station_accept.conf'
 hostapd_deny_station_conf = '/run/hostapd/{ifname}_station_deny.conf'
 
+country_code_path = ['system', 'wireless', 'country-code']
+
 def find_other_stations(conf, base, ifname):
     """
     Only one wireless interface per phy can be in station mode -
@@ -78,7 +80,11 @@ def get_config(config=None):
         conf = Config()
     base = ['interfaces', 'wireless']
 
-    ifname, wifi = get_interface_dict(conf, base)
+    _, wifi = get_interface_dict(conf, base)
+
+    # retrieve global Wireless regulatory domain setting
+    if conf.exists(country_code_path):
+        wifi['country_code'] = conf.return_value(country_code_path)
 
     if 'deleted' not in wifi:
         # then get_interface_dict provides default keys
@@ -131,7 +137,8 @@ def verify(wifi):
 
     if wifi['type'] == 'access-point':
         if 'country_code' not in wifi:
-            raise ConfigError('Wireless country-code is mandatory')
+            raise ConfigError(f'Wireless country-code is mandatory, use: '\
+                              f'"set {" ".join(country_code_path)}"!')
 
         if 'channel' not in wifi:
             raise ConfigError('Wireless channel must be configured!')
diff --git a/src/conf_mode/system_wireless.py b/src/conf_mode/system_wireless.py
new file mode 100644
index 000000000..e0ca0ab8e
--- /dev/null
+++ b/src/conf_mode/system_wireless.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2024 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 exit
+
+from vyos.config import Config
+from vyos.configdep import set_dependents
+from vyos.configdep import call_dependents
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['system', 'wireless']
+    interface_base = ['interfaces', 'wireless']
+
+    wireless = conf.get_config_dict(base, key_mangling=('-', '_'),
+                                    get_first_key=True)
+
+
+    if conf.exists(interface_base):
+        wireless['interfaces'] = conf.list_nodes(interface_base)
+        for interface in wireless['interfaces']:
+            set_dependents('wireless', conf, interface)
+
+    return wireless
+
+def verify(wireless):
+    pass
+
+def generate(wireless):
+    pass
+
+def apply(wireless):
+    if 'interfaces' in wireless:
+        call_dependents()
+    pass
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)