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|
#!/bin/sh
[ -x /sbin/ebtables ] || exit 1
EBTABLES_DUMPFILE_STEM=/etc/ebtables/dump
RETVAL=0
prog="ebtables"
desc="Ethernet bridge filtering"
umask 0077
#default configuration
EBTABLES_MODULES_UNLOAD="yes"
EBTABLES_LOAD_ON_START="no"
EBTABLES_SAVE_ON_STOP="no"
EBTABLES_SAVE_ON_RESTART="no"
EBTABLES_SAVE_COUNTER="no"
EBTABLES_BACKUP_SUFFIX="~"
config=/etc/default/$prog
[ -f "$config" ] && . "$config"
get_supported_tables() {
EBTABLES_SUPPORTED_TABLES=
/sbin/ebtables -t filter -L 2>&1 1>/dev/null | grep -q permission
if [ $? -eq 0 ]; then
echo "Error: insufficient privileges to access the ebtables rulesets."
exit 1
fi
for table in filter nat broute; do
/sbin/ebtables -t $table -L &> /dev/null
if [ $? -eq 0 ]; then
EBTABLES_SUPPORTED_TABLES="${EBTABLES_SUPPORTED_TABLES} $table"
fi
done
}
load() {
RETVAL=0
get_supported_tables
echo -n "Restoring ebtables rulesets: "
for table in $EBTABLES_SUPPORTED_TABLES; do
echo -n "$table "
if [ -s ${EBTABLES_DUMPFILE_STEM}.$table ]; then
/sbin/ebtables -t $table --atomic-file ${EBTABLES_DUMPFILE_STEM}.$table --atomic-commit
RET=$?
if [ $RET -ne 0 ]; then
echo -n "(failed) "
RETVAL=$RET
fi
else
echo -n "(no saved state) "
fi
done
if [ -z "$EBTABLES_SUPPORTED_TABLES" ]; then
echo -n "no kernel support. "
else
echo -n "done. "
fi
if [ $RETVAL -eq 0 ]; then
echo "ok"
else
echo "fail"
fi
}
clear_rules() {
RETVAL=0
get_supported_tables
echo -n "Clearing ebtables rulesets: "
for table in $EBTABLES_SUPPORTED_TABLES; do
echo -n "$table "
/sbin/ebtables -t $table --init-table
done
if [ "$EBTABLES_MODULES_UNLOAD" = "yes" ]; then
for mod in $(grep -E '^(ebt|ebtable)_' /proc/modules | cut -d' ' -f1) ebtables; do
rmmod $mod 2> /dev/null
done
fi
if [ -z "$EBTABLES_SUPPORTED_TABLES" ]; then
echo -n "no kernel support. "
else
echo -n "done. "
fi
if [ $RETVAL -eq 0 ]; then
echo "ok"
else
echo "fail"
fi
}
save() {
RETVAL=0
get_supported_tables
echo -n "Saving ebtables rulesets: "
for table in $EBTABLES_SUPPORTED_TABLES; do
echo -n "$table "
[ -n "$EBTABLES_BACKUP_SUFFIX" ] && [ -s ${EBTABLES_DUMPFILE_STEM}.$table ] && \
mv ${EBTABLES_DUMPFILE_STEM}.$table ${EBTABLES_DUMPFILE_STEM}.$table$EBTABLES_BACKUP_SUFFIX
/sbin/ebtables -t $table --atomic-file ${EBTABLES_DUMPFILE_STEM}.$table --atomic-save
RET=$?
if [ $RET -ne 0 ]; then
echo -n "(failed) "
RETVAL=$RET
else
if [ "$EBTABLES_SAVE_COUNTER" = "no" ]; then
/sbin/ebtables -t $table --atomic-file ${EBTABLES_DUMPFILE_STEM}.$table -Z
fi
fi
done
if [ -z "$EBTABLES_SUPPORTED_TABLES" ]; then
echo -n "no kernel support. "
else
echo -n "done. "
fi
if [ $RETVAL -eq 0 ]; then
echo "ok"
else
echo "fail"
fi
}
case "$1" in
start)
[ "$EBTABLES_LOAD_ON_START" = "yes" ] && load
;;
stop)
[ "$EBTABLES_SAVE_ON_STOP" = "yes" ] && save
clear_rules
;;
restart|reload|force-reload)
[ "$EBTABLES_SAVE_ON_RESTART" = "yes" ] && save
clear_rules
[ "$EBTABLES_LOAD_ON_START" = "yes" ] && load
;;
load)
load
;;
save)
save
;;
status)
get_supported_tables
if [ -z "$EBTABLES_SUPPORTED_TABLES" ]; then
echo "No kernel support for ebtables."
RETVAL=1
else
echo -n "Ebtables support available, number of installed rules: "
for table in $EBTABLES_SUPPORTED_TABLES; do
COUNT=$(( $(/sbin/ebtables -t $table -L | sed -e "/^Bridge chain/! d" -e "s/^.*entries: //" -e "s/,.*$/ +/") 0 ))
echo -n "$table($COUNT) "
done
echo ok
RETVAL=0
fi
;;
*)
echo "Usage: $0 {start|stop|restart|reload|force-reload|load|save|status}" >&2
RETVAL=1
esac
exit $RETVAL
|
