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Date: Mon, 10 Jul 2023 12:21:42 -0400
From: Aaron Conole <aconole@...hat.com>
To: Adrian Moreno <amorenoz@...hat.com>
Cc: netdev@...r.kernel.org, dev@...nvswitch.org, Ilya Maximets
<i.maximets@....org>, Eric Dumazet <edumazet@...gle.com>,
linux-kselftest@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, shuah@...nel.org, "David S. Miller"
<davem@...emloft.net>
Subject: Re: [ovs-dev] [PATCH net-next 3/4] selftests: openvswitch: add
basic ct test case parsing
Adrian Moreno <amorenoz@...hat.com> writes:
> On 6/28/23 18:27, 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@...hat.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 5d60a9466dab3..40a66c72af0f0 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 799bfb3064b90..704cb4adf79a9 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:
>> @@ -477,6 +486,36 @@ 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)
>
> It seems the scan function is only called with "0" as second
> argument. Wouldn't it be easier to omit that extra argument (which is
> the default value for "int" anyway) and simplify the lambda for
> "helper" and "timeout"?
>
> Alternatively, we could have a function that tries both base-16 and base-10.
I think '10' is the default argument for int() -
>>> print("%d" % int("0x12"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '0x12'
>>> print("%d" % int("0x12", 0))
18
So, I will keep it as-is.
>> + ctact["attrs"].append([scan[1], datum])
>> + actstr = actstr[len(datum) :]
>
> "datum" can be of type int and ints don't have len(). Maybe just use "pos" directly?
Good catch! I'll correct it.
>> + else:
>> + ctact["attrs"].append([scan[1], None])
>> + actstr = actstr[strspn(actstr, ", ") :]
>> +
>> + self["attrs"].append(["OVS_ACTION_ATTR_CT", ctact])
>> + actstr = actstr[strspn(actstr, "), ") :]
>> + parsed = True
>> +
>> if not parsed:
>> raise ValueError("Action str: '%s' not supported" % actstr)
>>
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