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net-persistent-mac: allow for network device MAC persistency

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Some network devices do not have a fixed MAC address however this is
important to allow auto-configuration in a DHCP network.

To accomplish it, in a more generic way, we store the MAC and restore
it *before* the network services are started thus compatible with
netbase and connman configurations.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Adrian Alonso <aalonso00@gmail.com>
This commit is contained in:
Adrian Alonso 2012-07-03 21:26:06 -05:00
parent a5998b4832
commit 99670d8956
3 changed files with 66 additions and 0 deletions
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recipes-core/net-persistent-mac/net-persistent-mac.bb Normal file
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SUMMARY = "Network device MAC persistency"
DESCRIPTION = "Provides support to store/restore the MAC of a specific network device"
SECTION = "base"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58"
inherit update-rc.d
INITSCRIPT_NAME = "net-persistent-mac"
INITSCRIPT_PARAMS = "start 39 S ."
SRC_URI = "file://init \
file://default"
do_install () {
install -d ${D}${sysconfdir}/init.d
install -m 0755 ${WORKDIR}/init ${D}${sysconfdir}/init.d/${PN}
install -d ${D}${sysconfdir}/default
install -m 0644 ${WORKDIR}/default ${D}${sysconfdir}/default/${PN}
}
PACKAGE_ARCH = "${MACHINE_ARCH}"

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recipes-core/net-persistent-mac/net-persistent-mac/default Normal file
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INTERFACES=""

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recipes-core/net-persistent-mac/net-persistent-mac/init Normal file
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#!/bin/sh
### BEGIN INIT INFO
# Provides: net-persistent-mac
# Required-Start: $local_fs
# Required-Stop:
# Default-Start: S
# Default-Stop:
# X-Start-Before: networking
# Short-Description: restore MAC during boot process
### END INIT INFO
set -e
[ -f /etc/default/net-persistent-mac ] && . /etc/default/net-persistent-mac
MAC_DIR="/var/lib/net-persistent-mac"
for if in $INTERFACES; do
mkdir -p "$MAC_DIR"
IF_FILE="$MAC_DIR/$if.mac"
IF_MAC="/sys/class/net/$if/address"
# Store MAC for reuse
if [ ! -r "$IF_FILE" ]; then
if [ -e "$IF_MAC" ]; then
echo "Storing MAC for $if for future use." > /dev/stderr
cat "$IF_MAC" > "$IF_FILE"
else
echo "Failed to read MAC for $if; skiping device."
fi
fi
if [ -r "$IF_FILE" ]; then
# Restore MAC setting
WANTED_MAC=`cat $IF_FILE`
if [ "$WANTED_MAC" != "`cat $IF_MAC`" ]; then
echo "Setting MAC of $if to $WANTED_MAC."
ifconfig $if hw ether "$WANTED_MAC"
fi
fi
done