[PATCH net-next v6 2/2] selftests/net/openvswitch: add SCTP flow key test
From: Minxi Hou <hidden>
Date: 2026-07-24 15:06:42
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 The listener readiness probe reads /proc/net/sctp/eps instead of ss: ss requires the sctp_diag interface, which is not enabled on all kernels, while /proc/net/sctp/eps exists whenever SCTP is loaded. Signed-off-by: Minxi Hou <redacted> --- .../selftests/net/openvswitch/openvswitch.sh | 121 ++++++++++++++++++ 1 file changed, 121 insertions(+)
diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index 853dbc1b00d7..b448324527d8 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh@@ -34,6 +34,7 @@ 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 psample psample: Sampling packets with psample" info() {
@@ -611,6 +612,126 @@ test_icmpv6() { return 0 } +# Check for an SCTP endpoint via /proc, which works without sctp_diag. +sctp_eps_has() { + ip netns exec "$1" awk -v p="$2" '$6==p' /proc/net/sctp/eps | grep -q . +} + +# sctp_connect_v4 test +# - sctp(dst=4443) matches client-to-server INIT +# - sctp(src=4443) matches server-to-client INIT-ACK +# - remove flows and verify connection fails, reinstall and recover +test_sctp_connect_v4() { + local t="test_sctp_connect_v4" + local srv_ip=172.31.110.20 + + modprobe -q sctp 2>/dev/null || return "$ksft_skip" + socat -V 2>&1 | grep -q "define WITH_SCTP" || 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 "${srv_ip}/24" dev s1 + ip netns exec server ip link set s1 up + + # Probe: check if kernel supports sctp flow key. + ovs_add_flow "$t" sctp4 \ + 'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \ + '2' &>/dev/null + if [ $? -ne 0 ]; then + info "no support for sctp key - skipping" + ovs_exit_sig + return $ksft_skip + fi + ovs_del_flows "$t" sctp4 + + # 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 + + ovs_netns_spawn_daemon "$t" "server" \ + socat -u SCTP4-LISTEN:4443 STDOUT + local server_pid="$pid" + ovs_wait sctp_eps_has server 4443 || return 1 + + info "verify SCTP association with port-keyed flows" + ovs_sbx "$t" ip netns exec client \ + timeout 3 socat -u STDIN "SCTP4-CONNECT:${srv_ip}:4443" </dev/null \ + || 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 + local i=0 + while kill -0 "$server_pid" 2>/dev/null && [ "$i" -lt 5 ]; do + sleep 0.2 + i=$((i + 1)) + done + ovs_netns_spawn_daemon "$t" "server" \ + socat -u SCTP4-LISTEN:4443 STDOUT + server_pid="$pid" + ovs_wait sctp_eps_has server 4443 || return 1 + + ovs_sbx "$t" ip netns exec client \ + timeout 3 socat -u STDIN "SCTP4-CONNECT:${srv_ip}:4443" </dev/null \ + >/dev/null 2>&1 \ + && { info "connection should fail without flows" + return 1; } + + info "reinstall flows and verify recovery" + ovs_add_flow "$t" 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 + i=0 + while kill -0 "$server_pid" 2>/dev/null && [ "$i" -lt 5 ]; do + sleep 0.2 + i=$((i + 1)) + done + ovs_netns_spawn_daemon "$t" "server" \ + socat -u SCTP4-LISTEN:4443 STDOUT + server_pid="$pid" + ovs_wait sctp_eps_has server 4443 || return 1 + + ovs_sbx "$t" ip netns exec client \ + timeout 3 socat -u STDIN "SCTP4-CONNECT:${srv_ip}:4443" </dev/null \ + || return 1 + + return 0 +} + # psample test # - use psample to observe packets test_psample() {
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2.55.0