Add a CLI sample which can take in arbitrary request
in JSON format, convert it to Netlink and do the inverse
for output.

It's meant as a development tool primarily and perhaps
for selftests which need to tickle netlink in a special way.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 tools/net/ynl/samples/cli.py |  47 +++
 tools/net/ynl/samples/ynl.py | 534 +++++++++++++++++++++++++++++++++++
 2 files changed, 581 insertions(+)
 create mode 100755 tools/net/ynl/samples/cli.py
 create mode 100644 tools/net/ynl/samples/ynl.py

diff --git a/tools/net/ynl/samples/cli.py b/tools/net/ynl/samples/cli.py
new file mode 100755
index 000000000000..b27159c70710
--- /dev/null
+++ b/tools/net/ynl/samples/cli.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: BSD-3-Clause
+
+import argparse
+import json
+import pprint
+import time
+
+from ynl import YnlFamily
+
+
+def main():
+    parser = argparse.ArgumentParser(description='YNL CLI sample')
+    parser.add_argument('--spec', dest='spec', type=str, required=True)
+    parser.add_argument('--schema', dest='schema', type=str)
+    parser.add_argument('--json', dest='json_text', type=str)
+    parser.add_argument('--do', dest='do', type=str)
+    parser.add_argument('--dump', dest='dump', type=str)
+    parser.add_argument('--sleep', dest='sleep', type=int)
+    parser.add_argument('--subscribe', dest='ntf', type=str)
+    args = parser.parse_args()
+
+    attrs = {}
+    if args.json_text:
+        attrs = json.loads(args.json_text)
+
+    ynl = YnlFamily(args.spec, args.schema)
+
+    if args.ntf:
+        ynl.ntf_subscribe(args.ntf)
+
+    if args.sleep:
+        time.sleep(args.sleep)
+
+    if args.do or args.dump:
+        method = getattr(ynl, args.do if args.do else args.dump)
+
+        reply = method(attrs, dump=bool(args.dump))
+        pprint.PrettyPrinter().pprint(reply)
+
+    if args.ntf:
+        ynl.check_ntf()
+        pprint.PrettyPrinter().pprint(ynl.async_msg_queue)
+
+
+if __name__ == "__main__":
+    main()

diff --git a/tools/net/ynl/samples/ynl.py b/tools/net/ynl/samples/ynl.py
new file mode 100644
index 000000000000..b71523d71d46
--- /dev/null
+++ b/tools/net/ynl/samples/ynl.py

@@ -0,0 +1,534 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+import functools
+import jsonschema
+import os
+import random
+import socket
+import struct
+import yaml
+
+#
+# Generic Netlink code which should really be in some library, but I can't quickly find one.
+#
+