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#!/bin/sh
set -eu
# guessing parameters
case "$IFACE" in
*#*) exit 0 ;;
*:*) exit 0 ;;
vlan*.*) exit 0 ;;
vlan*) GUESSED_VLAN_ID="${IFACE#vlan}" ;;
*.*)
GUESSED_RAW_DEVICE="${IFACE%.*}"
GUESSED_VLAN_ID="${IFACE##*.}"
;;
*) [ -n "${IF_VLAN_ID:-}" -o -n "${IF_VLAN_RAW_DEVICE:-}" ] || exit 0 ;;
esac
RAW_DEVICE="${IF_VLAN_RAW_DEVICE:-${GUESSED_RAW_DEVICE:-}}"
VLAN_ID="$(expr ${IF_VLAN_ID:-${GUESSED_VLAN_ID:-0}} + 0 || :)"
if ! [ "$VLAN_ID" -gt 0 ]; then
echo "VLAN_ID for $IFACE is not set"
exit 1
fi
if [ -z "$RAW_DEVICE" ]; then
echo "RAW_DEVICE for $IFACE is not set"
exit 1
fi
if ! ip link show "$RAW_DEVICE" >/dev/null; then
echo "Device $RAW_DEVICE for $IFACE does not exist"
exit 1
fi
if ! [ -d /proc/net/vlan ]; then
modprobe 8021q
fi
ip link set dev "$RAW_DEVICE" up
ip link add link "$RAW_DEVICE" name "$IFACE" type vlan id "$VLAN_ID"
if ! ip link show "$IFACE" >/dev/null; then
echo "Failed to create vlan device $IFACE on device $RAW_DEVICE with tag $VLAN_ID"
exit 1
fi
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