Hacky script to use an ifb interface to shape traffic both ways on another interface

shaper.sh

#!/bin/sh

# shaper.sh eth1 clear # removes traffic shaping
# shaper.sh eth1 1000  # shapes eth1 to 1Mbit/s in both directions

# Andy Smith <andy@bitfolk.com>

intf="$1"
bw="$2"
ifb="ifb0"
 
if ! grep -q ^ifb /proc/modules; then
    modprobe ifb numifbs=1
fi
 
if [ "$bw" = "clear" ] || [ "$bw" = "delete" ]; then
    tc qdisc del dev "$intf" handle ffff: ingress 2>/dev/null || true
    tc qdisc del dev "$intf" root 2>/dev/null || true
    tc qdisc del dev "$ifb"  root 2>/dev/null || true
    ip link set dev "$ifb" down >/dev/null 2>&1 || true
else
    ip link set dev "$ifb" up >/dev/null 2>&1 || true
    tc qdisc del dev "$intf" handle ffff: ingress 2>/dev/null || true
    tc qdisc del dev "$intf" root 2>/dev/null || true
    tc qdisc del dev "$ifb"  root 2>/dev/null || true
 
    tc qdisc  add dev "$intf" handle ffff: ingress
    tc filter add dev "$intf" parent ffff: protocol all prio 50 \
           u32 match u32 0 0 action mirred egress redirect dev "$ifb"
 
    tc qdisc add dev "$intf" root tbf \
           rate "$bw"kbit latency 25ms burst 10k 
    tc qdisc add dev "$ifb"  root tbf \
           rate "$bw"kbit latency 25ms burst 10k 
fi