selftests: rtnetlink: use a local IP address for IPsec tests

Shannon Nelson · davem330 · commit 7000d53b865a · 2018-06-22T13:47:55.000+09:00
Find an IP address on this machine to use as a source IP, and make up a destination IP address based on the source IP. No actual messages will be sent, just a couple of IPsec rules are created and deleted. Fixes: 5e596ee ("selftests: add xfrm state-policy-monitor to rtnetlink.sh") Reported-by: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
@@ -525,8 +525,12 @@ kci_test_macsec()
 #-------------------------------------------------------------------
 kci_test_ipsec()
 {
-	srcip="14.0.0.52"
-	dstip="14.0.0.70"
+	# find an ip address on this machine and make up a destination
+	srcip=`ip -o addr | awk '/inet / { print $4; }' | grep -v "^127" | head -1 | cut -f1 -d/`
+	net=`echo $srcip | cut -f1-3 -d.`
+	base=`echo $srcip | cut -f4 -d.`
+	dstip="$net."`expr $base + 1`
+
 	algo="aead rfc4106(gcm(aes)) 0x3132333435363738393031323334353664636261 128"
 
 	# flush to be sure there's nothing configured
