#! /bin/sh
#_ETHER=`route -n get default 2>/dev/null |awk '/interface:/ {print $2}'`
#_ETHER=${_ETHER:=trunk0}
_ETHER=re0
_BRIDGE=bridge0
# Let the environment over-ride this
[ "$BRIDGE" ] || BRIDGE=${_BRIDGE}
[ "$ETHER" ] || ETHER=${_ETHER}
if test `id -u` -ne 0; then
SUDO=sudo
fi
echo -n " {$1 ($BRIDGE <-> $ETHER)"
# Set the tun device into layer2 mode
$SUDO ifconfig $1 link0 up
# Set up our bridge
$SUDO ifconfig $1 group tun > /dev/null 2>&1
$SUDO ifconfig $BRIDGE create > /dev/null 2>&1 && {
# Only add rules if the bridge creation succeeds; otherwise
# duplicate rules get loaded each time qemu starts
# The following two block carp packets from wasting cpu cycles inside the
# qemu sessions, remove if testing carp inside qemu
$SUDO ifconfig $BRIDGE rule block in on $ETHER dst 33:33:0:0:0:12
$SUDO ifconfig $BRIDGE rule block in on $ETHER dst 01:00:5e:00:00:12
}
# Since we can specify ETHER and BRIDGE above, its possible that
# this tun interface or this physical interface was setup as part of
# a different bridge earlier, and that is never cleaned up, so we have
# to cleanup here first before we set it up; a physcal interface cannot
# be member to more than one bridge, thankfully, or I never would have
# caught this
ifconfig bridge | sed -n '/^bridge[0-9]*/{s/:.*$//;p;}' | while read brif
do
$SUDO ifconfig $brif del $ETHER > /dev/null 2>&1
$SUDO ifconfig $brif del $1 > /dev/null 2>&1
done
$SUDO ifconfig $BRIDGE add $ETHER up
$SUDO ifconfig $BRIDGE add $1 up || true
echo "}"
