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#!/bin/sh
# Copyright (C) 2012 Natanael Copa <ncopa@alpinelinux.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published
# by the Free Software Foundation. See http://www.gnu.org/ for details.
all_ports_exist() {
local i=
for i in "$@"; do
[ -d /sys/class/net/$i ] || return 1
done
return 0
}
wait_ports() {
local timeout= waitports=
[ -z "$IF_BRIDGE_WAITPORT" ] && return 0
set -- $IF_BRIDGE_WAITPORT
timeout="$1"
shift
waitports="$@"
[ -z "$waitports" ] && waitports="$PORTS"
while ! all_ports_exist $waitports; do
[ "$timeout" -eq 0 ] && return 0
timeout=$(($timeout - 1))
sleep 1
done
}
all_ports() {
local i=
for i in /sys/class/net/*/ifindex; do
i=${i%/*}
i=${i##*/}
case "$i" in
lo|$IFACE) continue;;
*) echo $i;;
esac
done
}
add_ports() {
local port=
for port in $PORTS; do
if [ -x /etc/network/if-pre-up.d/vlan ]; then
env IFACE=$port /etc/network/if-pre-up.d/vlan
fi
if [ -n "$IF_BRIDGE_HW" ]; then
ip link set dev $port addr $IF_BRIDGE_HW
fi
brctl addif $IFACE $port && ip link set dev $port up
done
}
del_ports() {
local port=
for port in $PORTS; do
ip link set dev $port down
brctl delif $IFACE $port
if [ -x /etc/network/ip-post-down.d/vlan ]; then
env IFACE=$port /etc/network/if-post-down.d/vlan
fi
done
}
set_bridge_opts() {
[ -n "$IF_BRIDGE_AGEING" ] \
&& brctl setageing $IFACE $IF_BRIDGE_AGEING
[ -n "$IF_BRIDGE_BRIDGEPRIO" ] \
&& brctl setbridgeprio $IFACE $IF_BRIDGE_BRIDGEPRIO
[ -n "$IF_BRIDGE_FD" ] \
&& brctl setfd $IFACE $IF_BRIDGE_FD
[ -n "$IF_BRIDGE_GCINT" ] \
&& brctl setgcint $IFACE $IF_BRIDGE_GCINT
[ -n "$IF_BRIDGE_HELLO" ] \
&& brctl sethello $IFACE $IF_BRIDGE_HELLO
[ -n "$IF_BRIDGE_MAXAGE" ] \
&& brctl setmaxage $IFACE $IF_BRIDGE_MAXAGE
[ -n "$IF_BRIDGE_PATHCOST" ] \
&& brctl setpathcost $IFACE $IF_BRIDGE_PATHCOST
[ -n "$IF_BRIDGE_PORTPRIO" ] \
&& brctl setportprio $IFACE $IF_BRIDGE_PORTPRIO
[ -n "$IF_BRIDGE_STP" ] \
&& brctl stp $IFACE $IF_BRIDGE_STP
}
all_ports_ready() {
local port=
for port in $PORTS; do
case $(cat /sys/class/net/$IFACE/brif/$port/state) in
""|0|3) ;; # 0 = disabled, 3 = forwarding
[12]) return 1;;
esac
done
return 0
}
find_maxwait() {
awk '{printf("%.f\n", 2 * $0 / 100); }' \
/sys/class/net/$IFACE/bridge/forward_delay
}
wait_bridge() {
local timeout=$IF_BRIDGE_MAXWAIT
if [ -z "$timeout" ]; then
timeout=$(find_maxwait)
fi
ip link set dev $IFACE up
while ! all_ports_ready; do
[ $timeout -eq 0 ] && break
timeout=$(($timeout - 1))
sleep 1
done
}
case "$IF_BRIDGE_PORTS" in
"") ;;
none) PORTS="";;
all) PORTS=$(all_ports);;
*) PORTS="$IF_BRIDGE_PORTS";;
esac
[ -z "$PORTS" ] && ! env | grep -q "^IF_BRIDGE" && exit
case "$MODE" in
start)
brctl addbr $IFACE || exit 1
wait_ports
set_bridge_opts
add_ports
wait_bridge
;;
stop) del_ports
ip link set dev $IFACE down
brctl delbr $IFACE || exit 1
;;
esac
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