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

Ido Schimmel
2022-03-20T07:52:45Z

On Fri, Mar 18, 2022 at 04:45:24PM +0100, Hans Schultz wrote:
> On tor, mar 17, 2022 at 16:57, Ido Schimmel <idosch@idosch.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@gmail.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
> >>