40 lines
1.3 KiB
Bash
Executable File
40 lines
1.3 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2022 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Set up networking on the host using a TAP device. This probably works on
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# many ubuntu or debian machines, but highly depends on the existing network
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# configuration.
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setup_network() {
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# ANCHOR: setup_tap
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sudo ip tuntap add mode tap user "$USER" vnet_hdr crosvm_tap
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sudo ip addr add 192.168.10.1/24 dev crosvm_tap
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sudo ip link set crosvm_tap up
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# ANCHOR_END: setup_tap
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# ANCHOR: setup_routing
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sudo sysctl net.ipv4.ip_forward=1
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# Network interface used to connect to the internet.
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HOST_DEV=$(ip route get 8.8.8.8 | awk -- '{printf $5}')
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sudo iptables -t nat -A POSTROUTING -o "${HOST_DEV}" -j MASQUERADE
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sudo iptables -A FORWARD -i "${HOST_DEV}" -o crosvm_tap -m state --state RELATED,ESTABLISHED -j ACCEPT
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sudo iptables -A FORWARD -i crosvm_tap -o "${HOST_DEV}" -j ACCEPT
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# ANCHOR_END: setup_routing
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}
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echo "This will set up a tap device 'crosvm_tap'."
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echo
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echo "It will run the following commands:"
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echo
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type setup_network | sed '1,3d;$d'
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echo
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read -p "Continue [y/N]? " -r
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if [[ ! $REPLY =~ ^[Yy]$ ]]; then
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exit 0
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fi
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set -ex
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setup_network
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