mac address

bb-setup-mac-address

#!/bin/bash

if ! id | grep -q root; then
	echo "must be run as root"
	exit
fi

log="bb-setup-mac-address:"

#mac address:
#cpsw_0_mac = eth0 - (from eeprom)
#cpsw_1_mac = usb0 - (BeagleBone Side: usb0_host_addr)
#cpsw_2_mac = usb0 - (USB host, pc side: usb0_dev_addr)
#cpsw_3_mac = usb1 - (BeagleBone Side: usb1_host_addr)
#cpsw_4_mac = usb1 - (USB host, pc side: usb1_dev_addr)

#wl18xx      - (internal wl18xx eeprom)
#wl18xx (AP) - (internal wl18xx eeprom + 1)

get_mac_addr () {
	unset mac_addr0
	mac_address="/proc/device-tree/ocp/ethernet@4a100000/slave@4a100200/mac-address"
	mac_address_v54="/proc/device-tree/ocp/interconnect@4a000000/segment@0/target-module@100000/ethernet@0/slave@200/mac-address"
	if [ -f ${mac_address} ] && [ -f /usr/bin/hexdump ] ; then
		echo "${log} ethernet@4a100000/slave@4a100200/mac-address"
		mac_addr0=$(hexdump -v -e '1/1 "%02X" ":"' ${mac_address} | sed 's/.$//')
		echo "${log} eth0: ${mac_addr0}"
	elif [ -f ${mac_address_v54} ] && [ -f /usr/bin/hexdump ] ; then
		echo "${log} ethernet@0/slave@200/mac-address"
		mac_addr0=$(hexdump -v -e '1/1 "%02X" ":"' ${mac_address_v54} | sed 's/.$//')
		echo "${log} eth0: ${mac_addr0}"
	else
		echo "${log} mac-address location changed again..."
		mac_addr0="1C:BA:8C:A2:ED:68"
		echo "${log} eth0: ${mac_addr0}"
	fi

	#Some devices are showing a blank mac_addr0 [00:00:00:00:00:00], let's fix that up...
	if [ "x${mac_addr0}" = "x00:00:00:00:00:00" ] ; then
		echo "${log} mac came up 00:00:00:00:00:00 fixing..."
		mac_addr0="1C:BA:8C:A2:ED:68"
		echo "${log} eth0: ${mac_addr0}"
	fi
}

process_base () {
	mac_addr0_octet_1_5=$(echo ${mac_addr0} | cut -c 1-14)
	mac_addr0_octet_6=$(echo ${mac_addr0} | awk -F ':' '{print $6}')
}

generate_usb0_host_addr () {
	#bc cuts off leading zero's, we need ten/ones value
	new_octet_6=$(echo "obase=16;ibase=16;$mac_addr0_octet_6 + 102" | bc)
	usb0_host_addr=${mac_addr0_octet_1_5}:$(echo ${new_octet_6} | cut -c 2-3)
	echo "${log} usb0_host_addr: ${usb0_host_addr}"
}

generate_usb0_dev_addr () {
	#bc cuts off leading zero's, we need ten/ones value
	new_octet_6=$(echo "obase=16;ibase=16;$mac_addr0_octet_6 + 103" | bc)
	usb0_dev_addr=${mac_addr0_octet_1_5}:$(echo ${new_octet_6} | cut -c 2-3)
	echo "${log} usb0_dev_addr: ${usb0_dev_addr}"
}

generate_usb1_host_addr () {
	#bc cuts off leading zero's, we need ten/ones value
	new_octet_6=$(echo "obase=16;ibase=16;$mac_addr0_octet_6 + 104" | bc)
	usb1_host_addr=${mac_addr0_octet_1_5}:$(echo ${new_octet_6} | cut -c 2-3)
	echo "${log} usb1_host_addr: ${usb1_host_addr}"
}

generate_usb1_dev_addr () {
	#bc cuts off leading zero's, we need ten/ones value
	new_octet_6=$(echo "obase=16;ibase=16;$mac_addr0_octet_6 + 105" | bc)
	usb1_dev_addr=${mac_addr0_octet_1_5}:$(echo ${new_octet_6} | cut -c 2-3)
	echo "${log} usb1_dev_addr: ${usb1_dev_addr}"
}

write_default_bb_mac_addr () {
	echo "# Default settings for bb-usb-gadgets. This file is sourced by /bin/sh from" > /etc/default/bb-mac-addr
	echo "# /usr/bin/bb-start-acm-ncm-rndis-old-gadget" >> /etc/default/bb-mac-addr
	echo "MAC_ADDR=${mac_addr0}" >> /etc/default/bb-mac-addr
	echo "USB0_HOST_ADDR=${usb0_host_addr}" >> /etc/default/bb-mac-addr
	echo "USB0_DEV_ADDR=${usb0_dev_addr}" >> /etc/default/bb-mac-addr
	echo "USB1_HOST_ADDR=${usb1_host_addr}" >> /etc/default/bb-mac-addr
	echo "USB1_DEV_ADDR=${usb1_dev_addr}" >> /etc/default/bb-mac-addr
}

get_mac_addr
process_base
generate_usb0_host_addr
generate_usb0_dev_addr
generate_usb1_host_addr
generate_usb1_dev_addr
write_default_bb_mac_addr