[PATCH v3 0/2] selftests: openvswitch: add SCTP flow key and NAT tests

[PATCH v3 0/2] selftests: openvswitch: add SCTP flow key and NAT tests

[Minxi Hou]

Two new OVS selftests for SCTP:

- patch 1 adds an SCTP flow-key test over IPv6: a client/server
  association is driven through three pipeline phases and the payload
  is checked on the receiver, so a broken SCTP key extract breaks the
  match and the delivery both.
- patch 2 adds SCTP conntrack NAT coverage with port translation:
  DNAT rewrites the destination to 172.31.110.20:5555, the reply comes
  back through the CT inverse tuple, and both post-recirc directions
  are matched on the translated ports. This exercises the SCTP branch
  of ovs_nat_update_key(), which a plain address-only NAT rule never
  reaches.

Both tests probe for the kernel features they need and skip with
$ksft_skip when conntrack/NAT support is missing.

Changes in v3 (review findings from the Sashiko pass on v2):
- restore the tab alignment of the new usage() entries
- wait for the receiver payload with ovs_wait in both tests; a bare
  grep can race the background socat writing the file
- add CONFIG_NF_CT_PROTO_SCTP to the selftest config fragment; without
  it the conntrack table never sees the SCTP association
- probe with ct(commit,nat) so a kernel without NAT support skips the
  test instead of failing when the real flows are added
- translate the destination port in the NAT test (4443 to 5555) so the
  SCTP port-rewrite path in ovs_nat_update_key() is actually covered
- correct the commit logs: drop the INIT/DATA chunk claim (the flow
  key only carries the ports), drop the parse_ipv6hdr coverage claim,
  and point patch 2 at ovs_nat_update_key() instead of
  ovs_flow_key_update_l3l4() which only runs on the defrag path


Minxi Hou (2):
  selftests/net/openvswitch: add SCTP flow key test over IPv6
  selftests/net/openvswitch: add SCTP NAT test with port translation

 .../testing/selftests/net/openvswitch/config  |   1 +
 .../selftests/net/openvswitch/openvswitch.sh  | 182 ++++++++++++++++++
 2 files changed, 183 insertions(+)


base-commit: d0ec95a8a4e79f2fd6063fc8932415db8c227689
-- 
2.55.0

[PATCH v3 1/2] selftests/net/openvswitch: add SCTP flow key test over IPv6

[Minxi Hou]

The merged SCTP test covers only IPv4. The SCTP branch of the IPv6
extractor (the proto=132 walk after parse_ipv6hdr) and the v6 side of
the SCTP netlink validation (match_validate() requires the sctp() key
whenever ipv6(proto=132) is matched) have no selftest coverage.

Add test_sctp_connect_v6 mirroring the v4 test: bare icmpv6() flows
forward NS/NA, and ipv6(proto=132),sctp(dst=4443)/sctp(src=4443)
flows gate the association in the same three phases (flows installed,
removed, reinstalled). After the association succeeds the test also
pushes a known payload across and waits for the listener to log it,
proving the datapath carries the association's traffic end to end,
not only its handshake. Skips when the sctp module is missing, socat
lacks SCTP support, or IPv6 is unavailable; an association or payload
failure with the flows installed fails the test.

Signed-off-by: Minxi Hou <houminxi@gmail.com>
---
 .../selftests/net/openvswitch/openvswitch.sh  | 95 +++++++++++++++++++
 1 file changed, 95 insertions(+)

diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index a31f7fb6882d..0926e304ed88 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
@@ -34,6 +34,7 @@ tests="
 	trunc					trunc: output truncation
 	icmpv6					icmpv6: ICMPv6 echo type match
 	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" \
+	    <<< "$payload" || return 1
+	ovs_wait grep -q "$payload" "$rxfile" \
+	    || { info "server did not receive SCTP DATA payload"
+	         return 1; }
+
+	ovs_del_flows "$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() {
-- 
2.55.0

Re: [PATCH v3 1/2] selftests/net/openvswitch: add SCTP flow key test over IPv6

[Aaron Conole]

Minxi Hou <houminxi@gmail.com> writes:

> The merged SCTP test covers only IPv4. The SCTP branch of the IPv6
> extractor (the proto=132 walk after parse_ipv6hdr) and the v6 side of
> the SCTP netlink validation (match_validate() requires the sctp() key
> whenever ipv6(proto=132) is matched) have no selftest coverage.
>
> Add test_sctp_connect_v6 mirroring the v4 test: bare icmpv6() flows
> forward NS/NA, and ipv6(proto=132),sctp(dst=4443)/sctp(src=4443)
> flows gate the association in the same three phases (flows installed,
> removed, reinstalled). After the association succeeds the test also
> pushes a known payload across and waits for the listener to log it,
> proving the datapath carries the association's traffic end to end,
> not only its handshake. Skips when the sctp module is missing, socat
> lacks SCTP support, or IPv6 is unavailable; an association or payload
> failure with the flows installed fails the test.
>
> Signed-off-by: Minxi Hou <houminxi@gmail.com>
> ---
>  .../selftests/net/openvswitch/openvswitch.sh  | 95 +++++++++++++++++++
>  1 file changed, 95 insertions(+)
>
> diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
> index a31f7fb6882d..0926e304ed88 100755
> --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
> +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
> @@ -34,6 +34,7 @@ tests="
>  	trunc					trunc: output truncation
>  	icmpv6					icmpv6: ICMPv6 echo type match
>  	sctp_connect_v4				sctp: SCTP flow key matching
> +	sctp_connect_v6			sctp6: SCTP flow key matching over IPv6

This series has a spacing alignment issue in the test list (line 37
doesn't align with the others).  This is the third version where basic
formatting issues appear in this same block, and it is indicative of a
larger problem.  I do understand you're trying to address feedback in a
timely fashion.

I need to be direct: submitting patches with preventable formatting
issues suggests they're not getting a careful final review before
firing off 'git send-email'.  These kinds of errors create unnecessary
review cycles and CI burden.

Before submitting, please review your own patches with the same care a
maintainer would.  You should be checking the functionality, and the
architecture, yes.  You should make sure all of the feedback is
addressed, yes.  BUT you also need to care for formatting, alignment,
and style consistency.  A pre-submission checklist might help catch
these.

I'm setting this series aside for now.  Please resubmit when you've had a
chance to do a thorough self-review.  That may take more than 24 hours.
Please don't rush this important pre-submission step.

>  	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" \
> +	    <<< "$payload" || return 1
> +	ovs_wait grep -q "$payload" "$rxfile" \
> +	    || { info "server did not receive SCTP DATA payload"
> +	         return 1; }
> +
> +	ovs_del_flows "$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() {

[PATCH v3 2/2] selftests/net/openvswitch: add SCTP NAT test with port translation

[Minxi Hou]

After conntrack NAT rewrites a packet, OVS refreshes the cached flow
key in ovs_nat_update_key(), which has a per-protocol branch for the
L4 ports (UDP/TCP/SCTP, conntrack.c). Address-only NAT cannot tell a
working SCTP branch from a missing one: the ports survive unchanged
either way, so a post-recirc match on the original port stays green
even with the branch deleted. The suite's NAT coverage drives TCP
over nc, and the merged SCTP test has no conntrack in the path, so
the SCTP branch goes unexercised.

Add test_sctp_nat_connect_v4: untracked client traffic to
192.168.0.20:4443 hits ct(commit,nat(dst=172.31.110.20:5555)),recirc,
and the post-recirc flows match the translated tuple,
ipv4(dst=172.31.110.20),sctp(dst=5555). Reply traffic is matched on
the restored original tuple, sctp(src=4443). With the SCTP branch
broken the translated port never reaches the key, no post-recirc
flow matches, and the association fails. The probe flow uses the
same ct+nat action as the real flows, so a kernel without
CONFIG_NF_NAT rejects it at flow-add time and the test skips instead
of failing; CONFIG_NF_CT_PROTO_SCTP=y is added to the config fragment
for the same reason (the symbol is user-visible only with
NETFILTER_ADVANCED=y). After the association succeeds the test pushes
a known payload across and waits for the listener to log it.

Signed-off-by: Minxi Hou <houminxi@gmail.com>
---
 .../testing/selftests/net/openvswitch/config  |  1 +
 .../selftests/net/openvswitch/openvswitch.sh  | 87 +++++++++++++++++++
 2 files changed, 88 insertions(+)

diff --git a/tools/testing/selftests/net/openvswitch/config b/tools/testing/selftests/net/openvswitch/config
index a825e0b5c88e..fa90475dc388 100644
--- a/tools/testing/selftests/net/openvswitch/config
+++ b/tools/testing/selftests/net/openvswitch/config
@@ -7,6 +7,7 @@ CONFIG_NET_IPGRE=m
 CONFIG_NET_IPGRE_DEMUX=m
 CONFIG_NF_CONNTRACK=m
 CONFIG_NF_CONNTRACK_OVS=y
+CONFIG_NF_CT_PROTO_SCTP=y
 CONFIG_OPENVSWITCH=m
 CONFIG_PSAMPLE=m
 CONFIG_VETH=y
diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index 0926e304ed88..fb37b6ab2ec1 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
@@ -35,6 +35,7 @@ tests="
 	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"
 
 info() {
@@ -1186,6 +1187,92 @@ test_nat_connect_v4 () {
 	return 0
 }
 
+# sctp_nat_connect_v4 test
+#  - SCTP association crosses a ct(commit,nat(dst=ip:port)) DNAT
+#  - post-recirc flows match the translated address and port, so the
+#    SCTP branch of the post-NAT flow key update is load-bearing
+test_sctp_nat_connect_v4 () {
+	local t="test_sctp_nat_connect_v4"
+	local payload="SCTP_NAT_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"
+	# 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 and nat actions can be configured.
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		'in_port(1),eth(),eth_type(0x0800),ipv4()' \
+		'ct(commit,nat(dst=172.31.110.20:5555)),recirc(0x1)' &> /dev/null
+	if [ $? == 1 ]; then
+		info "no support for ct/nat actions - skipping"
+		ovs_exit_sig
+		return $ksft_skip
+	fi
+
+	ovs_del_flows "test_sctp_nat_connect_v4" sctpnat4
+
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		"ct_state(-trk),in_port(1),eth(),eth_type(0x0800),ipv4(dst=192.168.0.20)" \
+		"ct(commit,nat(dst=172.31.110.20:5555)),recirc(0x1)" || return 1
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		"ct_state(-trk),in_port(2),eth(),eth_type(0x0800),ipv4()" \
+		"ct(commit,nat),recirc(0x2)" || return 1
+
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		"recirc_id(0x1),ct_state(+trk-inv),in_port(1),eth(),eth_type(0x0800),ipv4(dst=172.31.110.20,proto=132),sctp(dst=5555)" \
+		"2" || return 1
+	ovs_add_flow "test_sctp_nat_connect_v4" sctpnat4 \
+		"recirc_id(0x2),ct_state(+trk-inv),in_port(2),eth(),eth_type(0x0800),ipv4(src=192.168.0.20,proto=132),sctp(src=4443)" \
+		"1" || return 1
+
+	ovs_netns_spawn_daemon "test_sctp_nat_connect_v4" "server" \
+		socat -u -t 1 SCTP4-LISTEN:5555,fork \
+		OPEN:"$rxfile",creat,append
+	ovs_wait sctp_eps_has server 5555 || 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 || return 1
+
+	info "verify SCTP DATA chunk crosses NAT"
+	ovs_sbx "test_sctp_nat_connect_v4" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP4-CONNECT:192.168.0.20:4443" \
+	    <<< "$payload" || return 1
+	ovs_wait grep -q "$payload" "$rxfile" \
+	    || { 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
-- 
2.55.0