[PATCH] Devices: add SitDevice

[Jan Tluka]

This patch adds new device SitDevice to setup a sit tunnel device.

Signed-off-by: Jan Tluka 
---
 lnst/Devices/SitDevice.py | 68 +++++++++++++++++++++++++++++++++++++++
 lnst/Devices/__init__.py  |  2 ++
 2 files changed, 70 insertions(+)
 create mode 100644 lnst/Devices/SitDevice.py

diff --git a/lnst/Devices/SitDevice.py b/lnst/Devices/SitDevice.py
new file mode 100644
index 00000000..a509e110
--- /dev/null
+++ b/lnst/Devices/SitDevice.py
@@ -0,0 +1,68 @@
+"""
+Defines the SitDevice class.
+
+Copyright 2021 Red Hat, Inc.
+Licensed under the GNU General Public License, version 2 as
+published by the Free Software Foundation; see COPYING for details.
+"""
+
+__author__ = """
[e-mail] (Jan Tluka)
+"""
+
+from lnst.Common.IpAddress import ipaddress
+from lnst.Devices.SoftDevice import SoftDevice
+from lnst.Common.DeviceError import DeviceError
+
+class SitDevice(SoftDevice):
+    _name_template = "t_sit"
+    _link_type = "sit"
+    _mandatory_opts = ["local", "remote"]
+    _mode_mapping = {
+        'any': 0,
+        'ipv6/ipv4': 41,
+        'ip6ip': 41,
+        'ipip': 4,
+        'ip4ip4': 4,
+        'mpls/ipv4': 137,
+        'mplsip': 137
+    }
+
+    def __init__(self, ifmanager, *args, **kwargs):
+        if kwargs.get("mode", False) and not kwargs['mode'] in self._mode_mapping:
+            raise DeviceError("Invalid mode specified for the sit device")
+
+        super(SitDevice, self).__init__(ifmanager, *args, **kwargs)
+
+    @property
+    def local(self):
+        try:
+            return ipaddress(self._get_linkinfo_data_attr("IFLA_SIT_LOCAL"))
+        except:
+            return None
+
+    @local.setter
+    def local(self, val):
+        self._set_linkinfo_data_attr("IFLA_SIT_LOCAL", str(ipaddress(val)))
+        self._nl_link_sync("set")
+
+    @property
+    def remote(self):
+        try:
+            return ipaddress(self._get_linkinfo_data_attr("IFLA_SIT_REMOTE"))
+        except:
+            return None
+
+    @remote.setter
+    def remote(self, val):
+        self._set_linkinfo_data_attr("IFLA_SIT_REMOTE", str(ipaddress(val)))
+        self._nl_link_sync("set")
+
+    @property
+    def mode(self):
+        return self._get_linkinfo_data_attr("IFLA_SIT_PROTO")
+
+    @mode.setter
+    def mode(self, val):
+        self._set_linkinfo_data_attr("IFLA_SIT_PROTO", self._mode_mapping[val])
+        self._nl_link_sync("set")
diff --git a/lnst/Devices/__init__.py b/lnst/Devices/__init__.py
index 2a604de8..4f68cb50 100644
--- a/lnst/Devices/__init__.py
+++ b/lnst/Devices/__init__.py
@@ -9,6 +9,7 @@ from lnst.Devices.VlanDevice import VlanDevice
 from lnst.Devices.VxlanDevice import VxlanDevice
 from lnst.Devices.GreDevice import GreDevice
 from lnst.Devices.Ip6GreDevice import Ip6GreDevice
+from lnst.Devices.SitDevice import SitDevice
 from lnst.Devices.VtiDevice import VtiDevice, Vti6Device
 from lnst.Devices.VethDevice import VethDevice, PairedVethDevice
 from lnst.Devices.VethPair import VethPair
@@ -24,6 +25,7 @@ device_classes = [
         ("VxlanDevice", VxlanDevice),
         ("GreDevice", GreDevice),
         ("Ip6GreDevice", Ip6GreDevice),
+        ("SitDevice", SitDevice),
         ("VethDevice", VethDevice),
         ("PairedVethDevice", PairedVethDevice),
         ("VtiDevice", VtiDevice),