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+# Copyright 2019 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.ifconfig.interface import Interface
+
+
+class VXLANIf(Interface):
+ """
+ The VXLAN protocol is a tunnelling protocol designed to solve the
+ problem of limited VLAN IDs (4096) in IEEE 802.1q. With VXLAN the
+ size of the identifier is expanded to 24 bits (16777216).
+
+ VXLAN is described by IETF RFC 7348, and has been implemented by a
+ number of vendors. The protocol runs over UDP using a single
+ destination port. This document describes the Linux kernel tunnel
+ device, there is also a separate implementation of VXLAN for
+ Openvswitch.
+
+ Unlike most tunnels, a VXLAN is a 1 to N network, not just point to
+ point. A VXLAN device can learn the IP address of the other endpoint
+ either dynamically in a manner similar to a learning bridge, or make
+ use of statically-configured forwarding entries.
+
+ For more information please refer to:
+ https://www.kernel.org/doc/Documentation/networking/vxlan.txt
+ """
+
+ options = ['group', 'remote', 'dev', 'port', 'vni']
+
+ default = {
+ 'type': 'vxlan',
+ 'vni': 0,
+ 'dev': '',
+ 'group': '',
+ 'remote': '',
+ 'port': 8472, # The Linux implementation of VXLAN pre-dates
+ # the IANA's selection of a standard destination port
+ }
+
+ def __init__(self, ifname, **kargs):
+ super().__init__(ifname, **kargs)
+
+ def _create(self):
+ # we assume that by default a multicast interface is created
+ group = 'group {}'.format(self.config['group'])
+
+ # if remote host is specified we ignore the multicast address
+ if self.config['remote']:
+ group = 'remote {}'.format(self.config['remote'])
+
+ # an underlay device is not always specified
+ dev = ''
+ if self.config['dev']:
+ dev = 'dev {}'.format(self.config['dev'])
+
+ cmd = 'ip link add {ifname} type vxlan id {vni} {group} {dev} dstport {port}'.format(
+ **config)
+ self._cmd(cmd)
+
+ @staticmethod
+ def get_config():
+ """
+ VXLAN interfaces require a configuration when they are added using
+ iproute2. This static method will provide the configuration dictionary
+ used by this class.
+
+ Example:
+ >> dict = VXLANIf().get_config()
+ """
+ config = {
+ 'vni': 0,
+ 'dev': '',
+ 'group': '',
+ 'port': 8472, # The Linux implementation of VXLAN pre-dates
+ # the IANA's selection of a standard destination port
+ 'remote': ''
+ }
+ return config