RPi | USB | g_ether

usb_g_ether.sh

#!/bin/sh
[ $(id -u) = 0 ] || { echo "must be root" ; exit 1; }
set -o errexit
set -o nounset
set -o pipefail
set -o xtrace

[ "$(find /sys/class/net/ -type l -name usb0 2>&-)z" != "z" ] && exit 1

# dwc2 g_ether
micro /etc/modules

# dtoverlay=dwc2
micro /boot/config.txt

# ...rootwait modules-load=dwc2,g_ether
micro /boot/cmdline.txt

cat << EOF | tee /etc/modprobe.d/g_ether.conf > /dev/null
options g_ether use_eem=0
EOF
#micro /etc/modprobe.d/g_ether.conf

/usr/bin/dtoverlay dwc2
/sbin/modprobe dwc2
/sbin/modprobe g_ether

#cat << EOF | tee /etc/dnsmasq_usb0_gether.conf > /dev/null
cat << EOF | tee /etc/dnsmasq.d/usb0_gether.conf > /dev/null
# sudo apt-get install dnsmasq 
dhcp-rapid-commit
dhcp-authoritative
no-ping
interface=usb0
except-interface=wlan0
dhcp-range=usb0,10.10.0.2,10.10.0.2,255.255.255.252,1h
domain=gether.usb0
dhcp-option=net:usb0,option:netmask,255.255.255.252
dhcp-option=net:usb0,option:router,10.10.0.1
dhcp-option=usb0,6
#dhcp-option=net:usb0,option:dns-server,8.8.8.8,1.1.1.1
leasefile-ro
addn-hosts=/etc/hosts.usb0
local=/rpi.usb0/
#address=/doubleclick.net/127.0.0.1
EOF
#micro /etc/dnsmasq_usb0_gether.conf
#micro /etc/dnsmasq.d/usb0_gether.conf
cat << EOF | tee /etc/hosts.usb0  > /dev/null
10.10.0.1 	rpi.usb0
EOF
cat << EOF | tee /etc/network/interfaces.d/usb0_gether.conf > /dev/null
auto usb0
allow-hotplug usb0
iface usb0 inet static
	address 10.10.0.1
	netmask 255.255.255.252
EOF
#micro /etc/network/interfaces.d/usb0_gether.conf

# denyinterfaces usb0
micro /etc/dhcpcd.conf

ip link set dev usb0 up

#pgrep dnsmasq || dnsmasq -C /etc/dnsmasq_usb0_gether.conf &
#service dnsmasq enable
service dnsmasq restart

dmesg | grep -iE "g_ether|dwc2|usb0"

exit 0
exit 0

# /29, 255.255.255.248, 0.0.0.7
# /30, 255.255.255.252, 0.0.0.3


## https://www.catalog.update.microsoft.com/Search.aspx?q=USB%20RNDIS%20Gadget


#ip addr add 10.10.0.1/30 broadcast 10.10.0.3 dev usb0
#ip link set dev usb0 up
#ip route add default via 10.10.0.2 dev usb0

cat << EOF | tee /etc/sysctl.d/90-usb0_gether.conf > /dev/null
net.ipv4.ip_forward=1
EOF
cat << EOF | tee /etc/sysctl.d/90-usb0_gether.conf > /dev/null
# sudo apt-get install iptables-persistent
iptables --flush
iptables -t nat --flush

iptables --table nat --append POSTROUTING --out-interface wlan0 -j MASQUERADE
iptables --append FORWARD --in-interface wlan0 --out-interface usb0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables --append FORWARD --in-interface usb0 --out-interface wlan0 -j ACCEPT
iptables --append FORWARD --in-interface usb0 -j ACCEPT
iptables -t nat -A POSTROUTING -j MASQUERADE
# /etc/iptables/rules.v4
EOF