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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Date:   Sun, 20 Mar 2022 09:52:33 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     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 Fri, Mar 18, 2022 at 04:45:24PM +0100, Hans Schultz wrote:
> 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.

Is it because the 'locked' flag is not removed following the replace? At
least I don't see where it's handled in fdb_add_entry(). If so, please
fix it and use "bridge fdb replace" in the test.

> 
> >> +
> >> +	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
> >>