linux-kernel - Re: [PATCH v2 net-next 4/4] selftests: forwarding: add test of MAC-Auth Bypass to locked port tests

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Message-ID: <86mthnw9gr.fsf@gmail.com>
Date:   Fri, 18 Mar 2022 16:45:24 +0100
From:   Hans Schultz <schultz.hans@...il.com>
To:     Ido Schimmel <idosch@...sch.org>,
        Hans Schultz <schultz.hans@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ido Schimmel <idosch@...dia.com>, linux-kernel@...r.kernel.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 net-next 4/4] selftests: forwarding: add test of
 MAC-Auth Bypass to locked port tests

On tor, mar 17, 2022 at 16:57, Ido Schimmel <idosch@...sch.org> wrote:
> On Thu, Mar 17, 2022 at 10:39:02AM +0100, Hans Schultz wrote:
>> Verify that the MAC-Auth mechanism works by adding a FDB entry with the
>> locked flag set. denying access until the FDB entry is replaced with a
>> FDB entry without the locked flag set.
>> 
>> Signed-off-by: Hans Schultz <schultz.hans+netdev@...il.com>
>> ---
>>  .../net/forwarding/bridge_locked_port.sh      | 29 ++++++++++++++++++-
>>  1 file changed, 28 insertions(+), 1 deletion(-)
>> 
>> diff --git a/tools/testing/selftests/net/forwarding/bridge_locked_port.sh b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh
>> index 6e98efa6d371..2f9519e814b6 100755
>> --- a/tools/testing/selftests/net/forwarding/bridge_locked_port.sh
>> +++ b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh
>> @@ -1,7 +1,7 @@
>>  #!/bin/bash
>>  # SPDX-License-Identifier: GPL-2.0
>>  
>> -ALL_TESTS="locked_port_ipv4 locked_port_ipv6 locked_port_vlan"
>> +ALL_TESTS="locked_port_ipv4 locked_port_ipv6 locked_port_vlan locked_port_mab"
>>  NUM_NETIFS=4
>>  CHECK_TC="no"
>>  source lib.sh
>> @@ -170,6 +170,33 @@ locked_port_ipv6()
>>  	log_test "Locked port ipv6"
>>  }
>>  
>> +locked_port_mab()
>> +{
>> +	RET=0
>> +	check_locked_port_support || return 0
>> +
>> +	ping_do $h1 192.0.2.2
>> +	check_err $? "MAB: Ping did not work before locking port"
>> +
>> +	bridge link set dev $swp1 locked on
>> +	bridge link set dev $swp1 learning on
>> +
>> +	ping_do $h1 192.0.2.2
>> +	check_fail $? "MAB: Ping worked on port just locked"
>> +
>> +	if ! bridge fdb show | grep `mac_get $h1` | grep -q "locked"; then
>> +		RET=1
>> +		retmsg="MAB: No locked fdb entry after ping on locked port"
>> +	fi
>
> bridge fdb show | grep `mac_get $h1 | grep -q "locked"
> check_err $? "MAB: No locked fdb entry after ping on locked port"
>
>> +
>> +	bridge fdb del `mac_get $h1` dev $swp1 master
>> +	bridge fdb add `mac_get $h1` dev $swp1 master static
>
> bridge fdb replace `mac_get $h1` dev $swp1 master static
>
Unfortunately for some reason 'replace' does not work in several of the
tests, while when replaced with 'del+add', they work.

>> +
>> +	ping_do $h1 192.0.2.2
>> +	check_err $? "MAB: Ping did not work with fdb entry without locked flag"
>> +
>> +	log_test "Locked port MAB"
>
> Clean up after the test to revert to initial state:
>
> bridge fdb del `mac_get $h1` dev $swp1 master
> bridge link set dev $swp1 locked off
>
>
>> +}
>>  trap cleanup EXIT
>>  
>>  setup_prepare
>> -- 
>> 2.30.2
>>