tools/br_teardown.sh: add bridge network teardown helper

Performs the reverse of br_setup.sh.

Signed-off-by: David Disseldorp <ddiss@suse.de>

diff --git a/tools/br_teardown.sh b/tools/br_teardown.sh
new file mode 100755 (executable)
index 0000000..ea91feb
--- /dev/null
+++ b/tools/br_teardown.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+#
+# Copyright (C) SUSE LINUX GmbH 2017, all rights reserved.
+#
+# This library is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) version 3.
+#
+# This library is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+# License for more details.
+
+RAPIDO_DIR="`dirname $0`/.."
+. "${RAPIDO_DIR}/runtime.vars"
+
+set -x
+
+TUNCTL=$(which tunctl) || _fail "tunctl missing"
+
+if [ -n "$BR_DHCP_SRV_RANGE" ]; then
+       dnsmasq_pid=`ps -eo pid,args | grep -v grep | grep dnsmasq \
+                       | grep -- --interface=$BR_DEV \
+                       | grep -- --dhcp-range=$BR_DHCP_SRV_RANGE \
+                       | awk '{print $1}'`
+       if [ -z "$dnsmasq_pid" ]; then
+               echo "failed to find dnsmasq process"
+               exit 1
+       fi
+       kill "$dnsmasq_pid"
+fi
+
+ip link set dev $TAP_DEV1 down || exit 1
+ip link set dev $TAP_DEV0 down || exit 1
+ip link set dev $BR_DEV down || exit 1
+
+ip link set $TAP_DEV1 nomaster || exit 1
+$TUNCTL -d $TAP_DEV1 || exit 1
+
+ip link set $TAP_DEV0 nomaster || exit 1
+$TUNCTL -d $TAP_DEV0 || exit 1
+
+if [ -n "$BR_IF" ]; then
+       ip link set $BR_IF nomaster || exit 1
+fi
+
+if [ -n "$BR_ADDR" ]; then
+       ip addr del $BR_ADDR dev $BR_DEV || exit 1
+fi
+ip link delete $BR_DEV type bridge || exit 1