source: freewrt/package/fwifupdown/lib/bridge@ 655dec8

#!/bin/sh
#
# This file is part of the FreeWRT project. FreeWRT is copyrighted
# material, please see the LICENCE file in the top-level directory
# or at http://www.freewrt.org/licence for details.
#
# Christian Fischer <spaetzle@freewrt.org>
#


CFG_PREUP_IFUP_CHECK_OFF=1
CFG_DOWN_IFUP_CHECK_OFF=1

iface_type() {
        if [ "$MODE" = "start" ]
        then
                [ "${IF_BRIDGE_IFACES:-""}" != "" ]
        else
                [ "$(brctl show 2>&- | sed -n -e "/^${IFACE}/ { s/[[:space:]].*//gp }")" = $IFACE ]
        fi
}

bridge_ifaces() {
        brctl show 2>&- | sed -n -e "/^${IFACE}[[:space:]]/,/^\S/{ /^\(${IFACE}[[:space:]]\|[[:space:]]\)/s/^.*[[:space:]]//p }"
}

bridge_exists() {
        [ "$(brctl show 2>&- | sed -n -e "/^${IFACE}/ { s/[[:space:]].*//gp }")" = "$IFACE" ]
}

bridge_depup() {
        for IF in $IF_BRIDGE_IFACES
        do
                is_up $IF || ifup $IF || return 1
        done
}

bridge_addif() {
        local err
        for IF in $IF_BRIDGE_IFACES
        do
                madd $IF
                if ! err=$(brctl addif $IFACE $IF 2>&1 1>&-)
                then
                        mstate 1
                        merr $err
                        return 1
                fi
                mstate 0
        done
}

bridge_delif() {
        local err retval=0
        for IF in $(bridge_ifaces)
        do
                mremove $IF
                if ! err=$(brctl delif $IFACE $IF 2>&1 1>&-)
                then
                        mstate 1
                        merr $err
                        retval=1
                else
                        mstate 0
                fi
        done
        return $retval
}

bridge_create() {
        local err
        if ! err=$(brctl addbr $IFACE 2>&1 1>&-)
        then
                mstate 1
                merr $err
                return 1
        fi
        mstate 0
}

bridge_destroy() {
        local err
        mdestroy
        if ! err=$(brctl delbr $IFACE 2>&1 1>&-)
        then
                mstate 1
                merr $err
                return 1
        fi
        mstate 0
}


if_preup() {
        mcreate
        if ! [ -x "$(which brctl)" ]
        then
                mstate 1
                merr "brctl executable not found"
        fi

        if iface_exists 
        then
                mstate 1
                if ! bridge_exists
                then
                        merr "Interface of this name already exists, cannot create bridge ${IFACE}"
                        return 1
                fi
                merr "Bridge already created, run ifdown ${IFACE} first"
                return 1
        fi

        bridge_create || return 1

        if ! bridge_depup
        then
                bridge_delif
                bridge_destroy
                return 1
        fi

        if ! bridge_addif
        then
                bridge_delif
                bridge_destroy
                return 1
        fi
}

if_up() {
:
}

if_down() {
        mdestroy
        if ! bridge_exists
        then
                mstate 1
                merr "Bridge doesn't exist, run ifup ${IFACE} first"
                return 1
        fi
}

if_postdown() {
        bridge_delif
        bridge_destroy
}

# vim:ts=4