Subject: Re: [PATCH V3 net-next 4/4] selftests: forwarding: add test of MAC-Auth Bypass to locked port tests

From: Hans Schultz <[email-masked]>
Date: Fri, 27 May 2022 11:07:50 +0200

On tor, maj 26, 2022 at 17:27, Ido Schimmel <[email-masked]> wrote:
> On Tue, May 24, 2022 at 05:21:44PM +0200, 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 <[email-masked]>
>> ---
>>  .../net/forwarding/bridge_locked_port.sh      | 42 ++++++++++++++++---
>>  1 file changed, 36 insertions(+), 6 deletions(-)
>> 
>> diff --git a/tools/testing/selftests/net/forwarding/bridge_locked_port.sh b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh
>> index 5b02b6b60ce7..50b9048d044a 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
>> @@ -94,13 +94,13 @@ locked_port_ipv4()
>>  	ping_do $h1 192.0.2.2
>>  	check_fail $? "Ping worked after locking port, but before adding FDB entry"
>>  
>> -	bridge fdb add `mac_get $h1` dev $swp1 master static
>> +	bridge fdb replace `mac_get $h1` dev $swp1 master static
>>  
>>  	ping_do $h1 192.0.2.2
>>  	check_err $? "Ping did not work after locking port and adding FDB entry"
>>  
>>  	bridge link set dev $swp1 locked off
>> -	bridge fdb del `mac_get $h1` dev $swp1 master static
>> +	bridge fdb del `mac_get $h1` dev $swp1 master
>>  
>>  	ping_do $h1 192.0.2.2
>>  	check_err $? "Ping did not work after unlocking port and removing FDB entry."
>> @@ -124,13 +124,13 @@ locked_port_vlan()
>>  	ping_do $h1.100 198.51.100.2
>>  	check_fail $? "Ping through vlan worked after locking port, but before adding FDB entry"
>>  
>> -	bridge fdb add `mac_get $h1` dev $swp1 vlan 100 master static
>> +	bridge fdb replace `mac_get $h1` dev $swp1 master static
>>  
>>  	ping_do $h1.100 198.51.100.2
>>  	check_err $? "Ping through vlan did not work after locking port and adding FDB entry"
>>  
>>  	bridge link set dev $swp1 locked off
>> -	bridge fdb del `mac_get $h1` dev $swp1 vlan 100 master static
>> +	bridge fdb del `mac_get $h1` dev $swp1 vlan 100 master
>>  
>>  	ping_do $h1.100 198.51.100.2
>>  	check_err $? "Ping through vlan did not work after unlocking port and removing FDB entry"
>> @@ -153,7 +153,8 @@ locked_port_ipv6()
>>  	ping6_do $h1 2001:db8:1::2
>>  	check_fail $? "Ping6 worked after locking port, but before adding FDB entry"
>>  
>> -	bridge fdb add `mac_get $h1` dev $swp1 master static
>> +	bridge fdb replace `mac_get $h1` dev $swp1 master static
>> +
>>  	ping6_do $h1 2001:db8:1::2
>>  	check_err $? "Ping6 did not work after locking port and adding FDB entry"
>>  
>> @@ -166,6 +167,35 @@ locked_port_ipv6()
>>  	log_test "Locked port ipv6"
>>  }
>
> Why did you change s/add/replace/? Also, from the subject and commit
> message I understand the patch is about adding a new test, not changing
> existing ones.
>

Sorry, I might have lost a bit track of the kernel selftests, as for
internal reasons there has been a pause in the work. I will remove the
changes to the previous tests, and I hope it will be fine.

>>  
>> +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
>> +
>> +	bridge fdb del `mac_get $h1` dev $swp1 master
>
> Why the delete is needed? Aren't you getting errors on trying to delete
> a non-existing entry? In previous test cases learning is disabled and it
> seems the FDB entry is cleaned up.
>

I guess you are right.

>> +
>> +	ping_do $h1 192.0.2.2
>> +	check_fail $? "MAB: Ping worked on locked port without FDB entry"
>> +
>> +	bridge fdb show | grep `mac_get $h1` | grep -q "locked"
>> +	check_err $? "MAB: No locked fdb entry after ping on locked port"
>> +
>> +	bridge fdb replace `mac_get $h1` dev $swp1 master static
>> +
>> +	ping_do $h1 192.0.2.2
>> +	check_err $? "MAB: Ping did not work with fdb entry without locked flag"
>> +
>> +	bridge fdb del `mac_get $h1` dev $swp1 master
>
> bridge link set dev $swp1 learning off
>

noted.

>> +	bridge link set dev $swp1 locked off
>> +
>> +	log_test "Locked port MAB"
>> +}
>>  trap cleanup EXIT
>>  
>>  setup_prepare
>> -- 
>> 2.30.2
>>