1#!/usr/bin/python
2
3# Copyright (C) 2020 The Android Open Source Project
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#      http:#www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17import fcntl
18import struct
19import sys
20
21TUNSETIFF = 0x400454ca
22IFF_TAP = 0x0002
23IFF_NO_PI = 0x1000
24IFF_VNET_HDR = 0x4000
25
26tun_fd = int(sys.argv[1])
27tap_name = sys.argv[2]
28
29ifr = struct.pack('16sH', tap_name, IFF_TAP | IFF_NO_PI | IFF_VNET_HDR)
30fcntl.ioctl(tun_fd, TUNSETIFF, ifr)
31