[PATCH net-next v3] selftests/net/openvswitch: add SCTP flow key test
From: Minxi Hou <hidden>
Date: 2026-07-15 01:54:56
Also in:
linux-kselftest, lkml
Subsystem:
kernel selftest framework, networking [general], openvswitch, the rest · Maintainers:
Shuah Khan, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Aaron Conole, Eelco Chaudron, Ilya Maximets, Linus Torvalds
Add test_sctp_connect_v4() to verify OVS can match on SCTP flow keys
(sctp src/dst port).
The test sets up client and server namespaces connected through an
OVS bridge, installs port-keyed flows, and verifies:
- sctp(dst=4443) matches client-to-server INIT
- sctp(src=4443) matches server-to-client INIT-ACK
- removing flows drops the connection
- reinstalling flows restores connectivity
Signed-off-by: Minxi Hou <redacted>
---
.../selftests/net/openvswitch/openvswitch.sh | 105 ++++++++++++++++++
.../selftests/net/openvswitch/ovs-dpctl.py | 5 +
2 files changed, 110 insertions(+)
v2 -> v3:
- replace ncat with nc for consistency with other tests in the same
file (per Ilya Maximets' review)
- add wait for killed daemon processes (per sashiko review)
- replace 'Ncat: Listening' stderr grep with ss port-based readiness
check
diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index 2954245129a2..0ec9c969cd0a 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh@@ -32,6 +32,7 @@ tests=" dec_ttl ttl: dec_ttl decrements IP TTL flow_set flow-set: Flow modify action_set set: SET action rewrites fields + sctp_connect_v4 sctp: SCTP flow key matching psample psample: Sampling packets with psample" info() {
@@ -443,6 +444,110 @@ test_action_set() { return 0 } +# sctp_connect_v4 test +# - sctp(dst=4443) matches client-to-server INIT +# - sctp(src=4443) matches server-to-client INIT-ACK +# - remove flows and verify connection fails, reinstall and recover +test_sctp_connect_v4() { + local t="test_sctp_connect_v4" + + which nc >/dev/null 2>&1 || return $ksft_skip + nc --sctp -z 127.0.0.1 1 </dev/null 2>/dev/null || return $ksft_skip + modprobe -q sctp 2>/dev/null || return $ksft_skip + + sbx_add "$t" || return $? + ovs_add_dp "$t" sctp4 || return 1 + + info "create namespaces" + for ns in client server; do + ovs_add_netns_and_veths "$t" "sctp4" "$ns" \ + "${ns:0:1}0" "${ns:0:1}1" || return 1 + done + + ip netns exec client ip addr add 172.31.110.10/24 dev c1 + ip netns exec client ip link set c1 up + ip netns exec server ip addr add 172.31.110.20/24 dev s1 + ip netns exec server ip link set s1 up + + # ARP forwarding + ovs_add_flow "$t" sctp4 \ + 'in_port(1),eth(),eth_type(0x0806),arp()' \ + '2' || return 1 + ovs_add_flow "$t" sctp4 \ + 'in_port(2),eth(),eth_type(0x0806),arp()' \ + '1' || return 1 + + # SCTP port matching: dst for request, src for reply + ovs_add_flow "$t" sctp4 \ + 'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \ + '2' || return 1 + ovs_add_flow "$t" sctp4 \ + 'in_port(2),eth(),eth_type(0x0800),ipv4(proto=132),sctp(src=4443)' \ + '1' || return 1 + + echo "server" | \ + ovs_netns_spawn_daemon "$t" "server" \ + nc --sctp -l 172.31.110.20 -vn 4443 + local server_pid=$pid + ovs_wait ip netns exec server \ + ss -lnH sport = :4443 \| grep -q . \ + || return 1 + + info "verify SCTP association with port-keyed flows" + ovs_sbx "$t" ip netns exec client \ + nc --sctp -i 1 -zv 172.31.110.20 4443 \ + || return 1 + + ovs_del_flows "$t" sctp4 + + info "verify connection fails without flows" + ovs_add_flow "$t" sctp4 \ + 'in_port(1),eth(),eth_type(0x0806),arp()' \ + '2' || return 1 + ovs_add_flow "$t" sctp4 \ + 'in_port(2),eth(),eth_type(0x0806),arp()' \ + '1' || return 1 + + kill -TERM $server_pid 2>/dev/null + wait $server_pid 2>/dev/null + echo "server2" | \ + ovs_netns_spawn_daemon "$t" "server" \ + nc --sctp -l 172.31.110.20 -vn 4443 + server_pid=$pid + ovs_wait ip netns exec server \ + ss -lnH sport = :4443 \| grep -q . \ + || return 1 + + ovs_sbx "$t" ip netns exec client \ + nc --sctp -w 2 -zv 172.31.110.20 4443 \ + >/dev/null 2>&1 \ + && { info "FAIL: connection should fail without flows" + return 1; } + + info "reinstall flows and verify recovery" + ovs_add_flow "$t" sctp4 \ + 'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \ + '2' || return 1 + ovs_add_flow "$t" sctp4 \ + 'in_port(2),eth(),eth_type(0x0800),ipv4(proto=132),sctp(src=4443)' \ + '1' || return 1 + + kill -TERM $server_pid 2>/dev/null + wait $server_pid 2>/dev/null + echo "server3" | \ + ovs_netns_spawn_daemon "$t" "server" \ + nc --sctp -l 172.31.110.20 -vn 4443 + ovs_wait ip netns exec server \ + ss -lnH sport = :4443 \| grep -q . \ + || return 1 + + ovs_sbx "$t" ip netns exec client \ + nc --sctp -i 1 -zv 172.31.110.20 4443 \ + || return 1 + + return 0 +} + # psample test # - use psample to observe packets test_psample() {
diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
index e1ecfad2c03e..7cfc29ec7e59 100644
--- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
+++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py@@ -1982,6 +1982,11 @@ class ovskey(nla): "icmp", ovskey.ovs_key_icmp, ), + ( + "OVS_KEY_ATTR_SCTP", + "sctp", + ovskey.ovs_key_sctp, + ), ( "OVS_KEY_ATTR_TCP_FLAGS", "tcp_flags",
--
2.55.0