selftests: openvswitch: add an initial flow programming case

The openvswitch self-tests can test much of the control side of
the module (ie: what a vswitchd implementation would process),
but the actual packet forwarding cases aren't supported, making
the testing of limited value.

Add some flow parsing and an initial ARP based test case using
arping utility.  This lets us display flows, add some basic
output flows with simple matches, and test against a known good
forwarding case.
Signed-off-by: Aaron Conole <aconole@redhat.com>
Reviewed-by: Adrian Moreno <amorenoz@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

tools/testing/selftests/net/openvswitch/openvswitch.sh

@@ -11,6 +11,7 @@ VERBOSE=0
 TRACING=0
 
 tests="
+	arp_ping				eth-arp: Basic arp ping between two NS
 	netlink_checks				ovsnl: validate netlink attrs and settings
 	upcall_interfaces			ovs: test the upcall interfaces"
 
@@ -127,6 +128,16 @@ ovs_add_netns_and_veths () {
 	return 0
 }
 
+ovs_add_flow () {
+	info "Adding flow to DP: sbx:$1 br:$2 flow:$3 act:$4"
+	ovs_sbx "$1" python3 $ovs_base/ovs-dpctl.py add-flow "$2" "$3" "$4"
+	if [ $? -ne 0 ]; then
+		echo "Flow [ $3 : $4 ] failed" >> ${ovs_dir}/debug.log
+		return 1
+	fi
+	return 0
+}
+
 usage() {
 	echo
 	echo "$0 [OPTIONS] [TEST]..."
@@ -141,6 +152,46 @@ usage() {
 	exit 1
 }
 
+# arp_ping test
+# - client has 1500 byte MTU
+# - server has 1500 byte MTU
+# - send ARP ping between two ns
+test_arp_ping () {
+
+	which arping >/dev/null 2>&1 || return $ksft_skip
+
+	sbx_add "test_arp_ping" || return $?
+
+	ovs_add_dp "test_arp_ping" arpping || return 1
+
+	info "create namespaces"
+	for ns in client server; do
+		ovs_add_netns_and_veths "test_arp_ping" "arpping" "$ns" \
+		    "${ns:0:1}0" "${ns:0:1}1" || return 1
+	done
+
+	# Setup client namespace
+	ip netns exec client ip addr add 172.31.110.10/24 dev c1
+	ip netns exec client ip link set c1 up
+	HW_CLIENT=`ip netns exec client ip link show dev c1 | grep -E 'link/ether [0-9a-f:]+' | awk '{print $2;}'`
+	info "Client hwaddr: $HW_CLIENT"
+
+	# Setup server namespace
+	ip netns exec server ip addr add 172.31.110.20/24 dev s1
+	ip netns exec server ip link set s1 up
+	HW_SERVER=`ip netns exec server ip link show dev s1 | grep -E 'link/ether [0-9a-f:]+' | awk '{print $2;}'`
+	info "Server hwaddr: $HW_SERVER"
+
+	ovs_add_flow "test_arp_ping" arpping \
+		"in_port(1),eth(),eth_type(0x0806),arp(sip=172.31.110.10,tip=172.31.110.20,sha=$HW_CLIENT,tha=ff:ff:ff:ff:ff:ff)" '2' || return 1
+	ovs_add_flow "test_arp_ping" arpping \
+		"in_port(2),eth(),eth_type(0x0806),arp()" '1' || return 1
+
+	ovs_sbx "test_arp_ping" ip netns exec client arping -I c1 172.31.110.20 -c 1 || return 1
+
+	return 0
+}
+
 # netlink_validation
 # - Create a dp
 # - check no warning with "old version" simulation