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|
#!/bin/bash
#
# Small script scanning sysfs for physical network interfaces
# and creating additional network bridges 'br-nic-[0-9]'.
. /opt/openslx/config
# hack, should be sent by slx-admin (2022-05-09)
[ "$SLX_RUNMODE_MODULE" = "dnbd3" ] && SLX_DHCP_OTHER_NICS="yes"
# all features disabled
[ "$SLX_BRIDGE_OTHER_NICS" != "yes" ] \
&& [ "$SLX_DHCP_OTHER_NICS" != "yes" ] \
&& exit 0
declare -a slaves
readarray -s 1 -t slaves < <( brctl show | awk '{print $NF}' )
is_slave() {
for i in "${slaves[@]}"; do
[ "$i" == "$1" ] && return 0
done
return 1
}
declare -g id=1
for nic in /sys/class/net/*; do
ifname="${nic##*/}"
# The presence of this symlink pointing to the physical device
# seems to be a good way to detect real/physical intefaces.
if ! [ -h "${nic}/device" ]; then
echo "Skipping ${ifname}, not physical NIC"
continue
fi
# do not handle the primary interface
if [ "$SLX_PXE_NETIF" = "${ifname}" ]; then
echo "Skipping ${ifname}, is boot interface"
continue
fi
# already part of a bridge?
if is_slave "${ifname}"; then
echo "Skipping ${ifname}, already part of a bridge"
continue
fi
if [ "$SLX_BRIDGE_OTHER_NICS" = "yes" ]; then
# bridge
# create a bridge with the same MAC
bridge="br-nic-${id}"
echo "Bridging ${ifname} via ${bridge}..."
mac="$(cat "${nic}/address")"
if ! [[ $mac =~ ^([0-9a-f]{2}:){5}[0-9a-f]{2}$ ]]; then
echo "'$mac' does not seem like a valid MAC address." >&2
continue
fi
(
set -e
brctl addbr "$bridge"
brctl stp "$bridge" 0
ip link set addr "$mac" "$bridge"
ip link set dev "${ifname}" up
brctl addif "$bridge" "${ifname}"
ip link set dev "$bridge" up
)
ret=$?
if [ "$ret" != 0 ]; then
echo "Failed to setup additional bridge '$bridge' for '$ifname'." >&2
brctl delbr "$bridge"
continue
fi
# all fine, increase counter
(( id++ ))
# also, replace ifname with bridge name, in case we do DHCP below
ifname="$bridge"
fi
# DHCP?
if [ "$SLX_DHCP_OTHER_NICS" = "yes" ]; then
# DHCP.
echo "Starting DHCP service for ${ifname}..."
ip link set dev "${ifname}" up
systemctl --no-block start "dhcpc@${ifname}.service"
fi
done
exit 0
|
