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    Subject[PATCH net 05/17] selftests: mptcp: join: skip test if iptables/tc cmds fail
    Selftests are supposed to run on any kernels, including the old ones not
    supporting all MPTCP features.

    Some tests are using IPTables and/or TC commands to force some
    behaviours. If one of these commands fails -- likely because some
    features are not available due to missing kernel config -- we should
    intercept the error and skip the tests requiring these features.

    Note that if we expect to have these features available and if
    SELFTESTS_MPTCP_LIB_EXPECT_ALL_FEATURES env var is set to 1, the tests
    will be marked as failed instead of skipped.

    This patch also replaces the 'exit 1' by 'return 1' not to stop the
    selftest in the middle without the conclusion if there is an issue with
    NF or TC.

    Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
    Fixes: 8d014eaa9254 ("selftests: mptcp: add ADD_ADDR timeout test case")
    Cc: stable@vger.kernel.org
    Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
    ---
    tools/testing/selftests/net/mptcp/mptcp_join.sh | 88 ++++++++++++++++---------
    1 file changed, 57 insertions(+), 31 deletions(-)

    diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
    index 276396cbe60c..c471934ad5e0 100755
    --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
    +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
    @@ -286,11 +286,15 @@ reset_with_add_addr_timeout()
    fi

    ip netns exec $ns1 sysctl -q net.mptcp.add_addr_timeout=1
    - ip netns exec $ns2 $tables -A OUTPUT -p tcp \
    - -m tcp --tcp-option 30 \
    - -m bpf --bytecode \
    - "$CBPF_MPTCP_SUBOPTION_ADD_ADDR" \
    - -j DROP
    +
    + if ! ip netns exec $ns2 $tables -A OUTPUT -p tcp \
    + -m tcp --tcp-option 30 \
    + -m bpf --bytecode \
    + "$CBPF_MPTCP_SUBOPTION_ADD_ADDR" \
    + -j DROP; then
    + mark_as_skipped "unable to set the 'add addr' rule"
    + return 1
    + fi
    }

    # $1: test name
    @@ -334,17 +338,12 @@ reset_with_allow_join_id0()
    # tc action pedit offset 162 out of bounds
    #
    # Netfilter is used to mark packets with enough data.
    -reset_with_fail()
    +setup_fail_rules()
    {
    - reset "${1}" || return 1
    -
    - ip netns exec $ns1 sysctl -q net.mptcp.checksum_enabled=1
    - ip netns exec $ns2 sysctl -q net.mptcp.checksum_enabled=1
    -
    check_invert=1
    validate_checksum=1
    - local i="$2"
    - local ip="${3:-4}"
    + local i="$1"
    + local ip="${2:-4}"
    local tables

    tables="${iptables}"
    @@ -359,15 +358,32 @@ reset_with_fail()
    -p tcp \
    -m length --length 150:9999 \
    -m statistic --mode nth --packet 1 --every 99999 \
    - -j MARK --set-mark 42 || exit 1
    + -j MARK --set-mark 42 || return ${ksft_skip}

    - tc -n $ns2 qdisc add dev ns2eth$i clsact || exit 1
    + tc -n $ns2 qdisc add dev ns2eth$i clsact || return ${ksft_skip}
    tc -n $ns2 filter add dev ns2eth$i egress \
    protocol ip prio 1000 \
    handle 42 fw \
    action pedit munge offset 148 u8 invert \
    pipe csum tcp \
    - index 100 || exit 1
    + index 100 || return ${ksft_skip}
    +}
    +
    +reset_with_fail()
    +{
    + reset "${1}" || return 1
    + shift
    +
    + ip netns exec $ns1 sysctl -q net.mptcp.checksum_enabled=1
    + ip netns exec $ns2 sysctl -q net.mptcp.checksum_enabled=1
    +
    + local rc=0
    + setup_fail_rules "${@}" || rc=$?
    +
    + if [ ${rc} -eq ${ksft_skip} ]; then
    + mark_as_skipped "unable to set the 'fail' rules"
    + return 1
    + fi
    }

    reset_with_events()
    @@ -382,6 +398,25 @@ reset_with_events()
    evts_ns2_pid=$!
    }

    +reset_with_tcp_filter()
    +{
    + reset "${1}" || return 1
    + shift
    +
    + local ns="${!1}"
    + local src="${2}"
    + local target="${3}"
    +
    + if ! ip netns exec "${ns}" ${iptables} \
    + -A INPUT \
    + -s "${src}" \
    + -p tcp \
    + -j "${target}"; then
    + mark_as_skipped "unable to set the filter rules"
    + return 1
    + fi
    +}
    +
    fail_test()
    {
    ret=1
    @@ -745,15 +780,6 @@ pm_nl_check_endpoint()
    fi
    }

    -filter_tcp_from()
    -{
    - local ns="${1}"
    - local src="${2}"
    - local target="${3}"
    -
    - ip netns exec "${ns}" ${iptables} -A INPUT -s "${src}" -p tcp -j "${target}"
    -}
    -
    do_transfer()
    {
    local listener_ns="$1"
    @@ -1975,23 +2001,23 @@ subflows_error_tests()
    fi

    # multiple subflows, with subflow creation error
    - if reset "multi subflows, with failing subflow"; then
    + if reset_with_tcp_filter "multi subflows, with failing subflow" ns1 10.0.3.2 REJECT &&
    + continue_if mptcp_lib_kallsyms_has "mptcp_pm_subflow_check_next$"; then
    pm_nl_set_limits $ns1 0 2
    pm_nl_set_limits $ns2 0 2
    pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
    pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
    - filter_tcp_from $ns1 10.0.3.2 REJECT
    run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
    chk_join_nr 1 1 1
    fi

    # multiple subflows, with subflow timeout on MPJ
    - if reset "multi subflows, with subflow timeout"; then
    + if reset_with_tcp_filter "multi subflows, with subflow timeout" ns1 10.0.3.2 DROP &&
    + continue_if mptcp_lib_kallsyms_has "mptcp_pm_subflow_check_next$"; then
    pm_nl_set_limits $ns1 0 2
    pm_nl_set_limits $ns2 0 2
    pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
    pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
    - filter_tcp_from $ns1 10.0.3.2 DROP
    run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
    chk_join_nr 1 1 1
    fi
    @@ -1999,11 +2025,11 @@ subflows_error_tests()
    # multiple subflows, check that the endpoint corresponding to
    # closed subflow (due to reset) is not reused if additional
    # subflows are added later
    - if reset "multi subflows, fair usage on close"; then
    + if reset_with_tcp_filter "multi subflows, fair usage on close" ns1 10.0.3.2 REJECT &&
    + continue_if mptcp_lib_kallsyms_has "mptcp_pm_subflow_check_next$"; then
    pm_nl_set_limits $ns1 0 1
    pm_nl_set_limits $ns2 0 1
    pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
    - filter_tcp_from $ns1 10.0.3.2 REJECT
    run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow &

    # mpj subflow will be in TW after the reset
    --
    2.40.1

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