[PATCH tck] 220-no-ip-spoofing.t: Don't use a static netmask

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For environments not using a /24 netmask, this test can end up in a hung
state. This patch reads the netmask from the nic and uses it later when
ip addresses are changed and restored.

---
 scripts/nwfilter/220-no-ip-spoofing.t | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/scripts/nwfilter/220-no-ip-spoofing.t b/scripts/nwfilter/220-no-ip-spoofing.t
index 5e8e0d7..3a0213d 100644
--- a/scripts/nwfilter/220-no-ip-spoofing.t
+++ b/scripts/nwfilter/220-no-ip-spoofing.t
@@ -79,19 +79,20 @@ $ssh->login("root", $tck->root_password());
 diag "preparing ip spoof";
 my $cmdfile = <<EOF;
 echo "DEV=`ip link | head -3 | tail -1 | awk '{print \\\$2}' | sed -e 's/://'`
+MASK=`ip addr show \\\$DEV | grep 'inet ' | awk '{print \\\$2}' | sed -e 's/.*\\///;q'`
 /sbin/ip addr show \\\$DEV
 /sbin/ip link set \\\$DEV down
 /sbin/ip addr flush dev \\\$DEV
-/sbin/ip addr add 192.168.122.183/24 dev \\\$DEV
+/sbin/ip addr add 192.168.122.183/\\\$MASK dev \\\$DEV
 /sbin/ip link set \\\$DEV up
 /sbin/ip addr show \\\$DEV
 /bin/sleep 1
 /bin/ping -c 1 192.168.122.1
 /sbin/ip link set \\\$DEV down
 /sbin/ip addr flush dev \\\$DEV
-/sbin/ip addr add ${guestip}/24 dev \\\$DEV
+/sbin/ip addr add ${guestip}/\\\$MASK dev \\\$DEV
 /sbin/ip link set \\\$DEV up
-/sbin/ip link \\\$DEV" > /test.sh
+/sbin/ip addr show \\\$DEV" > /test.sh
 EOF
 diag $cmdfile;
 my ($stdout, $stderr, $exit)  = $ssh->cmd($cmdfile);
-- 
1.8.4.5

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