Tests may wish to add other interfaces to listen on. Notably locally generated traffic uses dummy interfaces. The multicast daemon needs to know about these so that it allows forming rules that involve these interfaces, and so that net.ipv4.conf.X.mc_forwarding is set for the interfaces.

To that end, allow passing in a list of interfaces to configure in addition to all the physical ones.

Signed-off-by: Petr Machata petrm@nvidia.com Reviewed-by: Nikolay Aleksandrov razor@blackwall.org ---

Notes: v2: - Adjust as per shellcheck citations - Retain Nik's R-b, the changes were very minor.

--- CC: Shuah Khan shuah@kernel.org CC: linux-kselftest@vger.kernel.org

tools/testing/selftests/net/forwarding/lib.sh | 13 +++++++++++++ 1 file changed, 13 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh index 253847372062..83ee6a07e072 100644 --- a/tools/testing/selftests/net/forwarding/lib.sh +++ b/tools/testing/selftests/net/forwarding/lib.sh @@ -1760,9 +1760,12 @@ mc_send()

adf_mcd_start() { + local ifs=("$@") + local table_name="$MCD_TABLE_NAME" local smcroutedir local pid + local if local i

check_command "$MCD" || return 1 @@ -1776,6 +1779,16 @@ adf_mcd_start() "$smcroutedir/$table_name.conf" done

+ for if in "${ifs[@]}"; do + if ! ip_link_has_flag "$if" MULTICAST; then + ip link set dev "$if" multicast on + defer ip link set dev "$if" multicast off + fi + + echo "phyint $if enable" >> \ + "$smcroutedir/$table_name.conf" + done + "$MCD" -N -I "$table_name" -f "$smcroutedir/$table_name.conf" \ -P "$smcroutedir/$table_name.pid" busywait "$BUSYWAIT_TIMEOUT" test -e "$smcroutedir/$table_name.pid"