Subject: Re: [PATCH net-next v3 5/5] selftests: forwarding: tests of locked port feature

From: Ido Schimmel <[email-masked]>
Date: Sun, 20 Feb 2022 11:12:50 +0200

On Fri, Feb 18, 2022 at 04:51:48PM +0100, Hans Schultz wrote:
> These tests check that the basic locked port feature works, so that no 'host'
> can communicate (ping) through a locked port unless the MAC address of the
> 'host' interface is in the forwarding database of the bridge.

Thanks for adding the test. I assume this was tested with both mv88e6xxx
and veth?

> 
> Signed-off-by: Hans Schultz <[email-masked]>
> ---
>  .../testing/selftests/net/forwarding/Makefile |   1 +
>  .../net/forwarding/bridge_locked_port.sh      | 174 ++++++++++++++++++
>  tools/testing/selftests/net/forwarding/lib.sh |  16 ++
>  3 files changed, 191 insertions(+)
>  create mode 100755 tools/testing/selftests/net/forwarding/bridge_locked_port.sh
> 
> diff --git a/tools/testing/selftests/net/forwarding/Makefile b/tools/testing/selftests/net/forwarding/Makefile
> index 72ee644d47bf..8fa97ae9af9e 100644
> --- a/tools/testing/selftests/net/forwarding/Makefile
> +++ b/tools/testing/selftests/net/forwarding/Makefile
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0+ OR MIT
>  
>  TEST_PROGS = bridge_igmp.sh \
> +	bridge_locked_port.sh \
>  	bridge_port_isolation.sh \
>  	bridge_sticky_fdb.sh \
>  	bridge_vlan_aware.sh \
> diff --git a/tools/testing/selftests/net/forwarding/bridge_locked_port.sh b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh
> new file mode 100755
> index 000000000000..d2805441b325
> --- /dev/null
> +++ b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh
> @@ -0,0 +1,174 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +
> +ALL_TESTS="locked_port_ipv4 locked_port_ipv6 locked_port_vlan"
> +NUM_NETIFS=4
> +CHECK_TC="no"
> +source lib.sh
> +
> +h1_create()
> +{
> +	simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64
> +	vrf_create "vrf-vlan-h1"
> +        ip link set dev vrf-vlan-h1 up
> +        vlan_create $h1 100 vrf-vlan-h1 192.0.3.1/24 2001:db8:3::1/64

In the tests we try to use only addresses specified in RFC 5737. Instead
of 192.0.3.0/24 I suggest 198.51.100.0/24

> +}
> +
> +h1_destroy()
> +{
> +	vlan_destroy $h1 100
> +	simple_if_fini $h1 192.0.2.1/24 2001:db8:1::1/64
> +}
> +
> +h2_create()
> +{
> +	simple_if_init $h2 192.0.2.2/24 2001:db8:1::2/64
> +	vrf_create "vrf-vlan-h2"
> +	ip link set dev vrf-vlan-h2 up
> +	vlan_create $h2 100 vrf-vlan-h2 192.0.3.2/24 2001:db8:3::2/64
> +}
> +
> +h2_destroy()
> +{
> +	vlan_destroy $h2 100
> +	simple_if_fini $h2 192.0.2.2/24 2001:db8:1::2/64
> +}
> +
> +switch_create()
> +{
> +	ip link add dev br0 type bridge vlan_filtering 1
> +
> +	ip link set dev $swp1 master br0
> +	ip link set dev $swp2 master br0
> +
> +	ip link set dev br0 up
> +	ip link set dev $swp1 up
> +	ip link set dev $swp2 up
> +
> +	bridge link set dev $swp1 learning off
> +}
> +
> +switch_destroy()
> +{
> +	ip link set dev $swp2 down
> +	ip link set dev $swp1 down
> +
> +	ip link del dev br0
> +}
> +
> +setup_prepare()
> +{
> +	h1=${NETIFS[p1]}
> +	swp1=${NETIFS[p2]}
> +
> +	swp2=${NETIFS[p3]}
> +	h2=${NETIFS[p4]}
> +
> +	vrf_prepare
> +
> +	h1_create
> +	h2_create
> +
> +	switch_create
> +}
> +
> +cleanup()
> +{
> +	pre_cleanup
> +
> +	switch_destroy
> +
> +	h2_destroy
> +	h1_destroy
> +
> +	vrf_cleanup
> +}
> +
> +ifaddr()

We already have mac_get()

> +{
> +	ip -br link show dev "$1" | awk '{ print($3); }'
> +}
> +
> +locked_port_ipv4()
> +{
> +	RET=0
> +
> +	check_locked_port_support || return 0
> +
> +	ping_do $h1 192.0.2.2
> +	check_err $? "Ping didn't work when it should have"

Better to use unique error messages that pinpoint the problem:

"Ping did not work before locking port"

> +
> +	bridge link set dev $swp1 locked on
> +
> +	ping_do $h1 192.0.2.2
> +	check_fail $? "Ping worked when it should not have"

"Ping worked after locking port, but before adding a FDB entry"

> +
> +	bridge fdb add `ifaddr $h1` dev $swp1 master static

bridge fdb add $(mac_get $h1) dev $swp1 master static

> +
> +	ping_do $h1 192.0.2.2
> +	check_err $? "Ping didn't work when it should have"

"Ping did not work after locking port and adding a FDB entry"

> +
> +	bridge link set dev $swp1 locked off
> +	bridge fdb del `ifaddr $h1` dev $swp1 master static

I suggest to add another test case here to see that ping works after
unlocking the port and removing the FDB entry

Same comments on the other test cases

> +	log_test "Locked port ipv4"
> +}
> +
> +locked_port_vlan()
> +{
> +	RET=0
> +
> +	check_locked_port_support || return 0
> +	check_vlan_filtering_support || return 0

Why this check is needed? The bridge was already created with
"vlan_filtering 1"

> +
> +	bridge vlan add vid 100 dev $swp1 tagged

Not familiar with "tagged" keyword. I believe iproute2 ignores it.
Please drop it

> +	bridge vlan add vid 100 dev $swp2 tagged
> +
> +	ping_do $h1.100 192.0.3.2
> +	check_err $? "Ping didn't work when it should have"
> +
> +	bridge link set dev $swp1 locked on
> +	ping_do $h1.100 192.0.3.2
> +	check_fail $? "Ping worked when it should not have"
> +
> +	bridge fdb add `ifaddr $h1` dev $swp1 vlan 100 master static
> +
> +	ping_do $h1.100 192.0.3.2
> +	check_err $? "Ping didn't work when it should have"
> +
> +	bridge link set dev $swp1 locked off
> +	bridge vlan del vid 100 dev $swp1
> +	bridge vlan del vid 100 dev $swp2
> +	bridge fdb del `ifaddr $h1` dev $swp1 vlan 100 master static
> +	log_test "Locked port vlan"
> +}
> +
> +locked_port_ipv6()
> +{
> +	RET=0
> +	check_locked_port_support || return 0
> +
> +	ping6_do $h1 2001:db8:1::2
> +	check_err $? "Ping6 didn't work when it should have"
> +
> +	bridge link set dev $swp1 locked on
> +
> +	ping6_do $h1 2001:db8:1::2
> +	check_fail $? "Ping worked when it should not have"
> +
> +	bridge fdb add `ifaddr $h1` dev $swp1 master static
> +	ping6_do $h1 2001:db8:1::2
> +	check_err $? "Ping didn't work when it should have"
> +
> +	bridge link set dev $swp1 locked off
> +	bridge fdb del `ifaddr $h1` dev $swp1 master static
> +	log_test "Locked port ipv6"
> +}
> +
> +trap cleanup EXIT
> +
> +setup_prepare
> +setup_wait
> +
> +tests_run
> +
> +exit $EXIT_STATUS
> diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
> index 7da783d6f453..9ded90f17ead 100644
> --- a/tools/testing/selftests/net/forwarding/lib.sh
> +++ b/tools/testing/selftests/net/forwarding/lib.sh
> @@ -125,6 +125,22 @@ check_ethtool_lanes_support()
>  	fi
>  }
>  
> +check_locked_port_support()
> +{
> +        if ! bridge -d link show | grep -q " locked"; then
> +                echo "SKIP: iproute2 too old; Locked port feature not supported."
> +                return $ksft_skip
> +        fi
> +}
> +
> +check_vlan_filtering_support()
> +{
> +	if ! bridge -d vlan show | grep -q "state forwarding"; then
> +		echo "SKIP: vlan filtering not supported."
> +		return $ksft_skip
> +	fi
> +}
> +
>  if [[ "$(id -u)" -ne 0 ]]; then
>  	echo "SKIP: need root privileges"
>  	exit $ksft_skip
> -- 
> 2.30.2
>