@@ -11,16 +11,18 @@ ret=0
sfx=$(mktemp -u "XXXXXXXX")
ns1="ns1-$sfx"
ns2="ns2-$sfx"
+socatpid=0
cleanup()
{
+ [ $socatpid -gt 0 ] && kill $socatpid
ip netns del $ns1
ip netns del $ns2
}
-iperf3 -v > /dev/null 2>&1
+socat -h > /dev/null 2>&1
if [ $? -ne 0 ];then
- echo "SKIP: Could not run test without iperf3"
+ echo "SKIP: Could not run test without socat"
exit $ksft_skip
fi
@@ -60,8 +62,8 @@ ip netns exec $ns2 ip link set up dev veth2
ip netns exec $ns2 ip addr add 192.168.1.2/24 dev veth2
# Create a server in one namespace
-ip netns exec $ns1 iperf3 -s > /dev/null 2>&1 &
-iperfs=$!
+ip netns exec $ns1 socat -u TCP-LISTEN:5201,fork OPEN:/dev/null,wronly=1 &
+socatpid=$!
# Restrict source port to just one so we don't have to exhaust
# all others.
@@ -83,17 +85,43 @@ sleep 1
# ip daddr:dport will be rewritten to 192.168.1.1 5201
# NAT must reallocate source port 10000 because
# 192.168.1.2:10000 -> 192.168.1.1:5201 is already in use
-echo test | ip netns exec $ns2 socat -t 3 -u STDIN TCP:10.96.0.1:443 >/dev/null
+echo test | ip netns exec $ns2 socat -t 3 -u STDIN TCP:10.96.0.1:443,connect-timeout=3 >/dev/null
ret=$?
-kill $iperfs
-
# Check socat can connect to 10.96.0.1:443 (aka 192.168.1.1:5201).
if [ $ret -eq 0 ]; then
echo "PASS: socat can connect via NAT'd address"
else
echo "FAIL: socat cannot connect via NAT'd address"
- exit 1
fi
-exit 0
+# check sport clashres.
+ip netns exec $ns1 iptables -t nat -A PREROUTING -p tcp --dport 5202 -j REDIRECT --to-ports 5201
+ip netns exec $ns1 iptables -t nat -A PREROUTING -p tcp --dport 5203 -j REDIRECT --to-ports 5201
+
+sleep 5 | ip netns exec $ns2 socat -t 5 -u STDIN TCP:192.168.1.1:5202,connect-timeout=5 >/dev/null &
+cpid1=$!
+sleep 1
+
+# if connect succeeds, client closes instantly due to EOF on stdin.
+# if connect hangs, it will time out after 5s.
+echo | ip netns exec $ns2 socat -t 3 -u STDIN TCP:192.168.1.1:5203,connect-timeout=5 >/dev/null &
+cpid2=$!
+
+time_then=$(date +%s)
+wait $cpid2
+rv=$?
+time_now=$(date +%s)
+
+# Check how much time has elapsed, expectation is for
+# 'cpid2' to connect and then exit (and no connect delay).
+delta=$((time_now - time_then))
+
+if [ $delta -lt 2 -a $rv -eq 0 ]; then
+ echo "PASS: could connect to service via redirected ports"
+else
+ echo "FAIL: socat cannot connect to service via redirect ($delta seconds elapsed, returned $rv)"
+ ret=1
+fi
+
+exit $ret
Test that nat engine resolves the source port clash and tcp packet is passed to the correct socket. While at it, get rid of the iperf3 dependency, just use socat for listener side too. Signed-off-by: Florian Westphal <fw@strlen.de> --- .../selftests/netfilter/nf_nat_edemux.sh | 46 +++++++++++++++---- 1 file changed, 37 insertions(+), 9 deletions(-)