[v2,net-next,4/5] selftests: openvswitch: add basic ct test case parsing

  Forwarding via ct() action is an important use case for openvswitch, but
generally would require using a full ovs-vswitchd to get working. Add a
ct action parser for basic ct test case.

Signed-off-by: Aaron Conole <aconole@redhat.com>
---
NOTE: 3 lines flag the line-length checkpatch warning, but there didnt
      seem to be a really good way of breaking the lines smaller.

 .../selftests/net/openvswitch/openvswitch.sh  | 68 +++++++++++++++++++
 .../selftests/net/openvswitch/ovs-dpctl.py    | 39 +++++++++++
 2 files changed, 107 insertions(+)
  

On 7/28/23 13:59, Aaron Conole wrote:
> Forwarding via ct() action is an important use case for openvswitch, but
> generally would require using a full ovs-vswitchd to get working. Add a
> ct action parser for basic ct test case.
> 
> Signed-off-by: Aaron Conole <aconole@redhat.com>

Reviewed-by: Adrian Moreno <amorenoz@redhat.com>

> ---
> NOTE: 3 lines flag the line-length checkpatch warning, but there didnt
>        seem to be a really good way of breaking the lines smaller.
> 
>   .../selftests/net/openvswitch/openvswitch.sh  | 68 +++++++++++++++++++
>   .../selftests/net/openvswitch/ovs-dpctl.py    | 39 +++++++++++
>   2 files changed, 107 insertions(+)
> 
> diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
> index 5d60a9466dab..40a66c72af0f 100755
> --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
> +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
> @@ -12,6 +12,7 @@ TRACING=0
>   
>   tests="
>   	arp_ping				eth-arp: Basic arp ping between two NS
> +	ct_connect_v4				ip4-ct-xon: Basic ipv4 tcp connection using ct
>   	connect_v4				ip4-xon: Basic ipv4 ping between two NS
>   	netlink_checks				ovsnl: validate netlink attrs and settings
>   	upcall_interfaces			ovs: test the upcall interfaces"
> @@ -193,6 +194,73 @@ test_arp_ping () {
>   	return 0
>   }
>   
> +# ct_connect_v4 test
> +#  - client has 1500 byte MTU
> +#  - server has 1500 byte MTU
> +#  - use ICMP to ping in each direction
> +#  - only allow CT state stuff to pass through new in c -> s
> +test_ct_connect_v4 () {
> +
> +	which nc >/dev/null 2>/dev/null || return $ksft_skip
> +
> +	sbx_add "test_ct_connect_v4" || return $?
> +
> +	ovs_add_dp "test_ct_connect_v4" ct4 || return 1
> +	info "create namespaces"
> +	for ns in client server; do
> +		ovs_add_netns_and_veths "test_ct_connect_v4" "ct4" "$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
> +
> +	# Add forwarding for ARP and ip packets - completely wildcarded
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		     'ct_state(-trk),eth(),eth_type(0x0800),ipv4()' \
> +		     'ct(commit),recirc(0x1)' || return 1
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		     'recirc_id(0x1),ct_state(+trk+new),in_port(1),eth(),eth_type(0x0800),ipv4(src=172.31.110.10)' \
> +		     '2' || return 1
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		     'recirc_id(0x1),ct_state(+trk+est),in_port(1),eth(),eth_type(0x0800),ipv4(src=172.31.110.10)' \
> +		     '2' || return 1
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		     'recirc_id(0x1),ct_state(+trk+est),in_port(2),eth(),eth_type(0x0800),ipv4(dst=172.31.110.10)' \
> +		     '1' || return 1
> +	ovs_add_flow "test_ct_connect_v4" ct4 \
> +		     'recirc_id(0x1),ct_state(+trk+inv),eth(),eth_type(0x0800),ipv4()' 'drop' || \
> +		     return 1
> +
> +	# do a ping
> +	ovs_sbx "test_ct_connect_v4" ip netns exec client ping 172.31.110.20 -c 3 || return 1
> +
> +	# create an echo server in 'server'
> +	echo "server" | \
> +		ovs_netns_spawn_daemon "test_ct_connect_v4" "server" \
> +				nc -lvnp 4443
> +	ovs_sbx "test_ct_connect_v4" ip netns exec client nc -i 1 -zv 172.31.110.20 4443 || return 1
> +
> +	# Now test in the other direction (should fail)
> +	echo "client" | \
> +		ovs_netns_spawn_daemon "test_ct_connect_v4" "client" \
> +				nc -lvnp 4443
> +	ovs_sbx "test_ct_connect_v4" ip netns exec client nc -i 1 -zv 172.31.110.10 4443
> +	if [ $? == 0 ]; then
> +	   info "ct connect to client was successful"
> +	   return 1
> +	fi
> +
> +	info "done..."
> +	return 0
> +}
> +
>   # connect_v4 test
>   #  - client has 1500 byte MTU
>   #  - server has 1500 byte MTU
> diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> index 2b869e89c51d..6e258ab9e635 100644
> --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> @@ -62,6 +62,15 @@ def macstr(mac):
>       return outstr
>   
>   
> +def strcspn(str1, str2):
> +    tot = 0
> +    for char in str1:
> +        if str2.find(char) != -1:
> +            return tot
> +        tot += 1
> +    return tot
> +
> +
>   def strspn(str1, str2):
>       tot = 0
>       for char in str1:
> @@ -496,6 +505,36 @@ class ovsactions(nla):
>                       actstr = actstr[strspn(actstr, ", ") :]
>                       parsed = True
>   
> +            if parse_starts_block(actstr, "ct(", False):
> +                actstr = actstr[len("ct(") :]
> +                ctact = ovsactions.ctact()
> +
> +                for scan in (
> +                    ("commit", "OVS_CT_ATTR_COMMIT", None),
> +                    ("force_commit", "OVS_CT_ATTR_FORCE_COMMIT", None),
> +                    ("zone", "OVS_CT_ATTR_ZONE", int),
> +                    ("mark", "OVS_CT_ATTR_MARK", int),
> +                    ("helper", "OVS_CT_ATTR_HELPER", lambda x, y: str(x)),
> +                    ("timeout", "OVS_CT_ATTR_TIMEOUT", lambda x, y: str(x)),
> +                ):
> +                    if actstr.startswith(scan[0]):
> +                        actstr = actstr[len(scan[0]) :]
> +                        if scan[2] is not None:
> +                            if actstr[0] != "=":
> +                                raise ValueError("Invalid ct attr")
> +                            actstr = actstr[1:]
> +                            pos = strcspn(actstr, ",)")
> +                            datum = scan[2](actstr[:pos], 0)
> +                            ctact["attrs"].append([scan[1], datum])
> +                            actstr = actstr[pos:]
> +                        else:
> +                            ctact["attrs"].append([scan[1], None])
> +                        actstr = actstr[strspn(actstr, ", ") :]
> +
> +                self["attrs"].append(["OVS_ACTION_ATTR_CT", ctact])
> +                parsed = True
> +
> +            actstr = actstr[strspn(actstr, "), ") :]
>               if not parsed:
>                   raise ValueError("Action str: '%s' not supported" % actstr)
>