[PATCH net-next v2 1/2] selftests/net/openvswitch: add SCTP flow key test over IPv6

[Minxi Hou <houminxi@gmail.com>]

The merged SCTP test covers only IPv4. The IPv6 extraction path
(parse_ipv6hdr walking extension headers, then the proto=132 branch in
key_extract) and the v6 side of the SCTP netlink validation have no
selftest coverage at all, so a regression there would ship silently.

Add test_sctp_connect_v6 mirroring the v4 test: NS/NA forwarding flows
stand in for ARP, and ipv6(proto=132),sctp(dst=4443)/sctp(src=4443)
flows gate the association in the same three phases (flows installed,
flows removed, flows reinstalled). After the association succeeds the
test also pushes a known payload across and verifies the listener
received it, so a flow-key bug that matches handshake packets but
breaks DATA chunks is caught too. Skips when the sctp module is
missing, socat lacks SCTP support, or IPv6 is unavailable; an
association or DATA failure with the flows installed fails the test.

Signed-off-by: Minxi Hou <houminxi@gmail.com>
---
v2: rebased onto current net-next, no code changes
 .../selftests/net/openvswitch/openvswitch.sh  | 97 ++++++++++++++++++-
 1 file changed, 96 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index a31f7fb6882dc..06bd98d80a084 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
@@ -33,7 +33,8 @@ tests="
 	action_set				set: SET action rewrites fields
 	trunc					trunc: output truncation
 	icmpv6					icmpv6: ICMPv6 echo type match
-	sctp_connect_v4				sctp: SCTP flow key matching
+	sctp_connect_v4			sctp: SCTP flow key matching
+	sctp_connect_v6			sctp6: SCTP flow key matching over IPv6
 	psample					psample: Sampling packets with psample"
 
 info() {
@@ -700,6 +701,100 @@ test_sctp_connect_v4() {
 	return 0
 }
 
+# sctp_connect_v6 test
+# - sctp(dst=4443) matches client-to-server INIT
+# - sctp(src=4443) matches server-to-client INIT-ACK
+# - icmpv6 NS/NA flows forward neighbour discovery
+# - remove flows and verify connection fails, reinstall and recover
+test_sctp_connect_v6() {
+	local t="test_sctp_connect_v6"
+	local v6="eth_type(0x86dd),ipv6(proto=132)"
+	local payload="SCTP6_DATA_OK"
+	local rxfile="${ovs_base}/${t}/sctp-rx.txt"
+
+	modprobe -q sctp 2>/dev/null || return "$ksft_skip"
+	socat -V 2>&1 | grep -q "define WITH_SCTP" || return "$ksft_skip"
+	[ -e /proc/sys/net/ipv6 ] || return "$ksft_skip"
+
+	sbx_add "$t" || return $?
+	ovs_add_dp "$t" sctp6 || return 1
+
+	info "create namespaces"
+	for ns in client server; do
+		ovs_add_netns_and_veths "$t" "sctp6" "$ns" \
+		    "${ns:0:1}0" "${ns:0:1}1" || return 1
+	done
+
+	ip netns exec client ip addr add fd00::1/64 dev c1 nodad
+	ip netns exec client ip link set c1 up
+	ip netns exec server ip addr add fd00::2/64 dev s1 nodad
+	ip netns exec server ip link set s1 up
+
+	# NS/NA forwarding
+	ovs_add_flow "$t" sctp6 \
+	    'in_port(1),eth(),eth_type(0x86dd),ipv6(proto=58),icmpv6()' \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp6 \
+	    'in_port(2),eth(),eth_type(0x86dd),ipv6(proto=58),icmpv6()' \
+	    '1' || return 1
+
+	# SCTP port matching: dst for request, src for reply
+	ovs_add_flow "$t" sctp6 \
+	    "in_port(1),eth(),$v6,sctp(dst=4443)" \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp6 \
+	    "in_port(2),eth(),$v6,sctp(src=4443)" \
+	    '1' || return 1
+
+	ovs_netns_spawn_daemon "$t" "server" \
+	    socat -u -t 1 SCTP6-LISTEN:4443,fork \
+	    OPEN:"$rxfile",creat,append
+	ovs_wait sctp_eps_has server 4443 || return 1
+
+	info "verify SCTP association with port-keyed flows"
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP6-CONNECT:[fd00::2]:4443" </dev/null \
+	    || return 1
+
+	info "verify SCTP DATA chunk crosses the datapath"
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP6-CONNECT:[fd00::2]:4443" \
+	    <<< "$payload" || return 1
+	grep -q "$payload" "$rxfile" 2>/dev/null \
+	    || { info "server did not receive SCTP DATA payload"
+	         return 1; }
+
+	ovs_del_flows "$t" sctp6
+
+	info "verify connection fails without flows"
+	ovs_add_flow "$t" sctp6 \
+	    'in_port(1),eth(),eth_type(0x86dd),ipv6(proto=58),icmpv6()' \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp6 \
+	    'in_port(2),eth(),eth_type(0x86dd),ipv6(proto=58),icmpv6()' \
+	    '1' || return 1
+
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP6-CONNECT:[fd00::2]:4443" </dev/null \
+	    >/dev/null 2>&1 \
+	    && { info "connection should fail without flows"
+	         return 1; }
+
+	info "reinstall flows and verify recovery"
+	ovs_add_flow "$t" sctp6 \
+	    "in_port(1),eth(),$v6,sctp(dst=4443)" \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp6 \
+	    "in_port(2),eth(),$v6,sctp(src=4443)" \
+	    '1' || return 1
+
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP6-CONNECT:[fd00::2]:4443" </dev/null \
+	    || return 1
+
+	return 0
+}
+
 # psample test
 # - use psample to observe packets
 test_psample() {

base-commit: d0ec95a8a4e79f2fd6063fc8932415db8c227689
-- 
2.55.0