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# bridge (net-misc/bridge-utils) module for net-scripts
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# Version 1.0.2
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# Copyright (c) 2004 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License V2
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# Contributed by Roy Marples (uberlord@gentoo.org)
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# Fix any potential localisation problems
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# Note that LC_ALL trumps LC_anything_else according to locale(7)
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brctl() {
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LC_ALL=C /sbin/brctl "$@"
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}
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# char* bridge_provides(void)
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#
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# Returns a string to change module definition for starting up
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bridge_provides() {
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echo "bridge"
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}
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# void bridge_depend(void)
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#
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# Sets up the dependancies for the module
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bridge_depend() {
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after interface tuntap
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before dhcp
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}
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# bool bridge_check_installed(void)
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#
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# Returns 1 if bridge is installed, otherwise 0
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bridge_check_installed() {
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[[ -x /sbin/brctl ]] && return 0
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${1:-false} && eerror "For bridge support, emerge net-misc/bridge-utils"
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return 1
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}
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# bool bridge_check_depends(void)
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#
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# Checks to see if we have the needed functions
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bridge_check_depends() {
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local f
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for f in interface_variable interface_down interface_del_addresses interface_set_flag; do
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[[ $( type -t ${f} ) == function ]] && continue
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eerror "bridge: missing required function ${f}\n"
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return 1
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done
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return 0
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}
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# char* bridge_get_vars(char *interface)
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#
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# Returns a string spaced with possible user set
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# configuration variables
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bridge_get_vars() {
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echo "bridge_${1} brctl_${1}"
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}
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# char* bridge_get_ports(char *interface)
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#
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# Returns a string spaced with interfaces added to the given bridge
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# The awk statement kinda makes sense - would be much easier if the
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# brctl program exported the bridge name on each line :/
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bridge_get_ports() {
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brctl show | awk -v iface=${1} -v got=0 \
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'$1 == iface || got == 1 { \
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if ( got == 0 ) \
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{ print $4; got=1; } \
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else if ( NF == 1 ) \
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{ print $1; } \
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else \
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{ got = 0; } }' \
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| xargs
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}
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# bool bridge_start(char *iface)
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#
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# #set up bridge
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bridge_pre_start() {
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local iface=${1} ports i e x ifvar=$( interface_variable ${1} )
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local -a opts
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eval ports=\"\$\{bridge_${ifvar}\[@\]\}\"
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[[ -z ${ports} ]] && return 0
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# Destroy the bridge if it exists
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bridge_stop ${iface}
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ebegin "Creating bridge ${iface}"
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e=$( brctl addbr ${iface} 2>&1 )
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if [[ -n ${e} ]]; then
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if [[ ${e} == "br_add_bridge: Package not installed" ]]; then
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eend 1 "Bridging (802.1d) support is not present in this kernel"
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else
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eend 1 "${e}"
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fi
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return 1
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fi
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eval opts=( \"\$\{brctl_${ifvar}\[@\]\}\" )
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for (( i=0; i<${#opts[@]}; i++ )); do
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x=${opts[i]/ / ${iface} }
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[[ ${x} == ${opts[i]} ]] && x="${x} ${iface}"
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e=$( brctl ${x} 2>&1 1>/dev/null )
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[[ -n ${e} ]] && ewarn "${e}"
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done
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eend 0
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eindent
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for i in ${ports}; do
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# If the interface does not exist, it may be because another
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# module needs to create it
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net_start ${i} || continue
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if ! interface_exists ${i} ; then
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ewarn "interface ${i} does not exist"
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continue
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fi
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ebegin "Adding port ${i}"
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e=$( brctl addif ${iface} ${i} 2>&1 \
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&& interface_del_addresses ${i} \
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&& interface_set_flag ${i} promisc true \
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&& interface_up ${i} )
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if [[ -n ${e} ]]; then
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eend 1 "${e}"
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return 1
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fi
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done
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eoutdent
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return 0
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}
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# bool bridge_stop(char *iface)
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#
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# Removes the device
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# returns 0
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bridge_stop() {
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local iface=${1} is_bridge=$( brctl show | awk -v iface=${1} '$1 == iface {print $1}' )
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bridge_check_installed || return 1
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[[ -z ${is_bridge} ]] && return 1
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ebegin "Destroying bridge ${iface}"
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interface_down ${iface}
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local ports=$( bridge_get_ports ${1} ) i
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eindent
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for i in ${ports}; do
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ebegin "Removing port ${i}"
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interface_down ${i}
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interface_set_flag ${i} promisc false
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brctl delif ${iface} ${i} &>${devnull}
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eend $?
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done
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eoutdent
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brctl delbr ${iface} &>${devnull}
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eend 0
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return 0
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}
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