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Wed, 02 Sep 2026 05:51:48 -0700 (PDT) From: Minxi Hou To: netdev@vger.kernel.org Cc: aconole@redhat.com, davem@davemloft.net, dev@openvswitch.org, echaudro@redhat.com, edumazet@google.com, i.maximets@ovn.org, i.maximets@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, pabeni@redhat.com, shuah@kernel.org, horms@kernel.org, Minxi Hou Subject: [PATCH net-next v2 1/2] selftests/net/openvswitch: add SCTP flow key test over IPv6 Date: Wed, 2 Sep 2026 08:51:32 -0400 Message-ID: <20260902125133.1828572-2-houminxi@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260902125133.1828572-1-houminxi@gmail.com> References: <20260902125133.1828572-1-houminxi@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The merged SCTP test covers only IPv4. The IPv6 extraction path (parse_ipv6hdr walking extension headers, then the proto=3D132 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=3D132),sctp(dst=3D4443)/sctp(src=3D4443) 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 --- 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=3D" 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" =20 info() { @@ -700,6 +701,100 @@ test_sctp_connect_v4() { return 0 } =20 +# sctp_connect_v6 test +# - sctp(dst=3D4443) matches client-to-server INIT +# - sctp(src=3D4443) 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=3D"test_sctp_connect_v6" + local v6=3D"eth_type(0x86dd),ipv6(proto=3D132)" + local payload=3D"SCTP6_DATA_OK" + local rxfile=3D"${ovs_base}/${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 "$t" sctp6 \ + 'in_port(1),eth(),eth_type(0x86dd),ipv6(proto=3D58),icmpv6()' \ + '2' || return 1 + ovs_add_flow "$t" sctp6 \ + 'in_port(2),eth(),eth_type(0x86dd),ipv6(proto=3D58),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=3D4443)" \ + '2' || return 1 + ovs_add_flow "$t" sctp6 \ + "in_port(2),eth(),$v6,sctp(src=3D4443)" \ + '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 \ + || { info "server did not receive SCTP DATA payload" + return 1; 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Wed, 02 Sep 2026 05:51:54 -0700 (PDT) Received: from houminxi ([61.170.217.176]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9395f35d823sm198612785a.25.2026.09.02.05.51.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Sep 2026 05:51:53 -0700 (PDT) From: Minxi Hou To: netdev@vger.kernel.org Cc: aconole@redhat.com, davem@davemloft.net, dev@openvswitch.org, echaudro@redhat.com, edumazet@google.com, i.maximets@ovn.org, i.maximets@redhat.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, pabeni@redhat.com, shuah@kernel.org, horms@kernel.org, Minxi Hou Subject: [PATCH net-next v2 2/2] selftests/net/openvswitch: add SCTP flow key test across conntrack NAT Date: Wed, 2 Sep 2026 08:51:33 -0400 Message-ID: <20260902125133.1828572-3-houminxi@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260902125133.1828572-1-houminxi@gmail.com> References: <20260902125133.1828572-1-houminxi@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Conntrack NAT rewrites the packet between the first-pass and recirc passes, and OVS re-extracts L3/L4 on the recirculated skb via ovs_flow_key_update_l3l4(). Nothing in the suite exercises SCTP key extraction on that post-NAT path: the existing nat test drives TCP over nc, and the merged SCTP test has no conntrack in the path. Add test_sctp_nat_connect_v4, reusing the nat4 fixture with the SCTP socket pair from the v4 SCTP test: untracked ipv4 traffic hits ct(commit,nat(...)),recirc, and the post-recirc flows match ct_state(+trk) with the extracted sctp(dst=3D4443)/sctp(src=3D4443) ports. A probe for the SCTP conntrack sysctl turns a kernel without working SCTP conntrack into a skip instead of an opaque timeout. After the association succeeds the test 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. If ct+nat is accepted but the association or DATA fails, the test fails. Signed-off-by: Minxi Hou --- v2: rebased onto current net-next, no code changes .../selftests/net/openvswitch/openvswitch.sh | 86 +++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools= /testing/selftests/net/openvswitch/openvswitch.sh index 06bd98d80a084..d5acdca0a0ac1 100755 --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh @@ -35,6 +35,7 @@ tests=3D" icmpv6 icmpv6: ICMPv6 echo type match sctp_connect_v4 sctp: SCTP flow key matching sctp_connect_v6 sctp6: SCTP flow key matching over IPv6 + sctp_nat_connect_v4 sctpnat4: SCTP flow key across conntrack NAT psample psample: Sampling packets with psample" =20 info() { @@ -1186,6 +1187,91 @@ test_nat_connect_v4 () { return 0 } =20 +# sctp_nat_connect_v4 test +# - SCTP association crosses a ct(commit,nat(dst=3D...)) translation +# - post-recirc flows match ct_state(+trk) plus the extracted SCTP ports +test_sctp_nat_connect_v4 () { + local t=3D"test_sctp_nat_connect_v4" + local payload=3D"SCTP_NAT_DATA_OK" + local rxfile=3D"${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 "$ksft_skip" + # SCTP conntrack is compiled into nf_conntrack.ko, so check that + # loading it actually exposed the SCTP conntrack sysctls. + modprobe -q nf_conntrack 2>/dev/null || return "$ksft_skip" + [ -e /proc/sys/net/netfilter/nf_conntrack_sctp_timeout_established ] \ + || { info "no SCTP conntrack support - skipping" + return "$ksft_skip"; } + + sbx_add "test_sctp_nat_connect_v4" || return $? + + ovs_add_dp "test_sctp_nat_connect_v4" sctpnat4 || return 1 + info "create namespaces" + for ns in client server; do + ovs_add_netns_and_veths "test_sctp_nat_connect_v4" "sctpnat4" \ + "$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 + + ip netns exec client ip route add default via 172.31.110.20 + + # Check if the ct action can be configured. + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + 'in_port(1),eth(),eth_type(0x0800),ipv4()' \ + 'ct(commit),recirc(0x1)' &> /dev/null + if [ $? =3D=3D 1 ]; then + info "no support for ct action - skipping" + ovs_exit_sig + return $ksft_skip + fi + + ovs_del_flows "test_sctp_nat_connect_v4" sctpnat4 + + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + 'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1 + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + 'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1 + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + "ct_state(-trk),in_port(1),eth(),eth_type(0x0800),ipv4(dst=3D192.168.0.2= 0)" \ + "ct(commit,nat(dst=3D172.31.110.20)),recirc(0x1)" || return 1 + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + "ct_state(-trk),in_port(2),eth(),eth_type(0x0800),ipv4()" \ + "ct(commit,nat),recirc(0x2)" || return 1 + + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + "recirc_id(0x1),ct_state(+trk-inv),in_port(1),eth(),eth_type(0x0800),ipv= 4(proto=3D132),sctp(dst=3D4443)" \ + "2" || return 1 + ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \ + "recirc_id(0x2),ct_state(+trk-inv),in_port(2),eth(),eth_type(0x0800),ipv= 4(proto=3D132),sctp(src=3D4443)" \ + "1" || return 1 + + ovs_netns_spawn_daemon "test_sctp_nat_connect_v4" "server" \ + socat -u -t 1 SCTP4-LISTEN:4443,fork \ + OPEN:"$rxfile",creat,append + ovs_wait sctp_eps_has server 4443 || return 1 + + info "verify SCTP association across NAT" + ovs_sbx "test_sctp_nat_connect_v4" ip netns exec client \ + timeout 3 socat -u STDIN "SCTP4-CONNECT:192.168.0.20:4443" \ + /dev/null \ + || { info "server did not receive SCTP DATA payload" + return 1; } + + info "done..." + return 0 +} + # nat_related_v4 test # - client->server ip packets go via SNAT # - client solicits ICMP destination unreachable packet from server base-commit: d0ec95a8a4e79f2fd6063fc8932415db8c227689 prerequisite-patch-id: a3848bf8ef3803b528f964b8e866dd3622e5b154 --=20 2.55.0