[oe-commits] Chen Qi : runqemu-ifdown: clean up the remaining iptables rules

[git at git.openembedded.org]

Module: openembedded-core.git
Branch: master
Commit: ef38a0aed35357d035ca587162158cd2f55b958f
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=ef38a0aed35357d035ca587162158cd2f55b958f

Author: Chen Qi <Qi.Chen at windriver.com>
Date:   Wed Aug 28 10:52:03 2013 +0800

runqemu-ifdown: clean up the remaining iptables rules

The iptables rules for the tap interface are added by runqemu-ifup
everytime we use runqemu to start a qemu target. But it's not cleaned
up when runqemu exits.

This patch cleans up the remaining iptables rules for the tap interface
in runqemu-ifdown.

[YOCTO #5047]

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

---

 scripts/runqemu-ifdown |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/scripts/runqemu-ifdown b/scripts/runqemu-ifdown
index 8b8c5a4..8f66cfa 100755
--- a/scripts/runqemu-ifdown
+++ b/scripts/runqemu-ifdown
@@ -50,3 +50,17 @@ if [ ! -e "$TUNCTL" ]; then
 fi
 
 $TUNCTL -d $TAP
+
+# cleanup the remaining iptables rules
+IPTABLES=`which iptables 2> /dev/null`
+if [ "x$IPTABLES" = "x" ]; then
+	IPTABLES=/sbin/iptables
+fi
+if [ ! -x "$IPTABLES" ]; then
+	echo "$IPTABLES cannot be executed"
+	exit 1
+fi
+n=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
+dest=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]
+$IPTABLES -D POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32
+$IPTABLES -D POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32