T6874: [QoS] Add class filter by ether

Implement a command to configure QoS policy filters by ether properties.
The supported match types include:
- Destination: Specify the Ethernet destination address.
- Protocol: Define the Ethernet protocol.
- Source: Set the Ethernet source address.

`set qos policy <type> <name> class <id> match <match-id> ether <destination|protocol|source> <val>`

1 files changed, 37 insertions, 0 deletions

diff --git a/src/validators/ether-type b/src/validators/ether-type
new file mode 100644
index 000000000..926db26d3
--- /dev/null
+++ b/src/validators/ether-type
@@ -0,0 +1,37 @@
+#!/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/>.
+
+import re
+from sys import argv,exit
+
+if __name__ == '__main__':
+    if len(argv) != 2:
+        exit(1)
+
+    input = argv[1]
+    try:
+        # ethertype can be in the range 1 - 65535
+        if int(input) in range(1, 65536):
+            exit(0)
+    except ValueError:
+        pass
+
+    pattern = "!?\\b(all|ip|ipv6|ipx|802.1Q|802_2|802_3|aarp|aoe|arp|atalk|dec|lat|localtalk|rarp|snap|x25)\\b"
+    if re.match(pattern, input):
+        exit(0)
+
+    print(f'Error: {input} is not a valid ether type or protocol.')
+    exit(1)