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# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.
bridge_depend()
{
before interface macnet
program /sbin/brctl
}
_config_vars="$_config_vars bridge bridge_add brctl"
_is_bridge()
{
[ -d /sys/class/net/"${1:-${IFACE}}"/bridge ]
return $?
}
_is_bridge_port()
{
[ -d /sys/class/net/"${1:-${IFACE}}"/brport ]
return $?
}
_bridge_ports()
{
for x in /sys/class/net/"${1:-${IFACE}}"/brif/*; do
n=${x##*/}
echo $n
done
}
bridge_pre_start()
{
local brif= oiface="${IFACE}" e= x=
# ports is for static add
local ports="$(_get_array "bridge_${IFVAR}")"
# old config options
local opts="$(_get_array "brctl_${IFVAR}")"
# brif is used for dynamic add
eval brif=\$bridge_add_${IFVAR}
# we need a way to if the bridge exists in a variable name, not just the
# contents of a variable. Eg if somebody has only bridge_add_eth0='br0',
# with no other lines mentioning br0.
eval bridge_unset=\${bridge_${IFVAR}-y\}
eval brctl_unset=\${brctl_${IFVAR}-y\}
if [ -z "${brif}" -a "${brctl_unset}" = 'y' ]; then
if [ -z "${ports}" -a "${bridge_unset}" = "y" ]; then
#eerror "Misconfigured static bridge detected (see net.example)"
return 0
fi
fi
# If the bridge was already up, we should clear it
[ "${bridge_unset}" != "y" ] && bridge_post_stop
(
# Normalize order of variables
if [ -z "${ports}" -a -n "${brif}" ]; then
# Dynamic mode detected
ports="${IFACE}"
IFACE="${brif}"
IFVAR=$(shell_var "${IFACE}")
else
# Static mode detected
ports="${ports}"
metric=1000
fi
if ! _is_bridge ; then
ebegin "Creating bridge ${IFACE}"
if ! brctl addbr "${IFACE}"; then
eend 1
return 1
fi
fi
# TODO: does this reset the bridge every time we add a interface to the
# bridge? We should probably NOT do that.
# Old configuration set mechanism
# Only a very limited subset of the options are available in the old
# configuration method. The sysfs interface is in the next block instead.
local IFS="$__IFS"
for x in ${opts}; do
unset IFS
set -- ${x}
x=$1
shift
set -- "${x}" "${IFACE}" "$@"
brctl "$@"
done
unset IFS
# New configuration set mechanism, matches bonding
for x in /sys/class/net/"${IFACE}"/bridge/*; do
[ -f "${x}" ] || continue
n=${x##*/}
eval s=\$${n}_${IFVAR}
if [ -n "${s}" ]; then
einfo "Setting ${n}: ${s}"
echo "${s}" >"${x}" || \
eerror "Failed to configure $n (${n}_${IFVAR})"
fi
done
if [ -n "${ports}" ]; then
einfo "Adding ports to ${IFACE}"
eindent
local BR_IFACE="${IFACE}"
for x in ${ports}; do
ebegin "${x}"
local IFACE="${x}"
local IFVAR=$(shell_var "${IFACE}")
if ! _exists "${IFACE}" ; then
eerror "Cannot add non-existent interface ${IFACE} to ${BR_IFACE}"
return 1
fi
# The interface is known to exist now
_set_flag promisc
_up
if ! brctl addif "${BR_IFACE}" "${x}"; then
_set_flag -promisc
eend 1
return 1
fi
# Per-interface bridge settings
for x in /sys/class/net/"${IFACE}"/brport/*; do
[ -f "${x}" ] || continue
n=${x##*/}
eval s=\$${n}_${IFVAR}
if [ -n "${s}" ]; then
einfo "Setting ${n}@${IFACE}: ${s}"
echo "${s}" >"${x}" || \
eerror "Failed to configure $n (${n}_${IFVAR})"
fi
done
eend 0
done
eoutdent
fi
) || return 1
# Bring up the bridge
_up
}
bridge_post_stop()
{
local port= ports= delete=false extra=
if _is_bridge "${IFACE}"; then
ebegin "Destroying bridge ${IFACE}"
_down
for x in /sys/class/net/"${IFACE}"/brif/*; do
[ -s $x ] || continue
n=${x##*/}
ports="${ports} ${n}"
done
delete=true
iface=${IFACE}
eindent
else
# We are taking down an interface that is part of a bridge maybe
ports="${IFACE}"
local brport_dir="/sys/class/net/${IFACE}/brport"
[ -d ${brport_dir} ] || return 0
iface=$(readlink ${brport_dir}/bridge)
iface=${iface##*/}
[ -z "${iface}" ] && return 0
extra=" from ${iface}"
fi
for port in ${ports}; do
ebegin "Removing port ${port}${extra}"
local IFACE="${port}"
_set_flag -promisc
brctl delif "${iface}" "${port}"
eend $?
done
if ${delete}; then
eoutdent
brctl delbr "${iface}"
eend $?
fi
return 0
}
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