1 files changed, 53 insertions, 0 deletions
diff --git a/python/vyos/qos/netem.py b/python/vyos/qos/netem.py
new file mode 100644
index 000000000..8bdef300b
--- /dev/null
+++ b/python/vyos/qos/netem.py
@@ -0,0 +1,53 @@
+# Copyright 2022 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+from vyos.qos.base import QoSBase
+
+class NetEm(QoSBase):
+    # https://man7.org/linux/man-pages/man8/tc-netem.8.html
+    def update(self, config, direction):
+        tmp = f'tc qdisc add dev {self._interface} root netem'
+        if 'bandwidth' in config:
+            rate = self._rate_convert(config["bandwidth"])
+            tmp += f' rate {rate}'
+
+        if 'queue_limit' in config:
+            limit = config["queue_limit"]
+            tmp += f' limit {limit}'
+
+        if 'delay' in config:
+            delay = config["delay"]
+            tmp += f' delay {delay}ms'
+
+        if 'loss' in config:
+            drop  = config["loss"]
+            tmp += f' drop {drop}%'
+
+        if 'corruption' in config:
+            corrupt = config["corruption"]
+            tmp += f' corrupt {corrupt}%'
+
+        if 'reordering' in config:
+            reorder = config["reordering"]
+            tmp += f' reorder {reorder}%'
+
+        if 'duplicate' in config:
+            duplicate = config["duplicate"]
+            tmp += f' duplicate {duplicate}%'
+
+        self._cmd(tmp)
+
+        # call base class
+        super().update(config, direction)