netdev - [PATCH net-next 4/8] selftests: forwarding: add helpers for IP multicast group joins/leaves

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Date:   Fri, 22 Apr 2022 13:15:00 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Mattias Forsblad <mattias.forsblad@...il.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        Joachim Wiberg <troglobit@...il.com>,
        Marek Behún <kabel@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>
Subject: [PATCH net-next 4/8] selftests: forwarding: add helpers for IP multicast group joins/leaves

Extend the forwarding library with calls to some small C programs which
join an IP multicast group and send some packets to it. Both IPv4 and
IPv6 groups are supported. Use cases range from testing IGMP/MLD
snooping, to RX filtering, to multicast routing.

Testing multicast traffic using msend/mreceive is intended to be done
using tcpdump.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 7eff5ecf7565..15fb46b39fe8 100755
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -27,6 +27,7 @@ INTERFACE_TIMEOUT=${INTERFACE_TIMEOUT:=600}
 LOW_AGEING_TIME=${LOW_AGEING_TIME:=1000}
 REQUIRE_JQ=${REQUIRE_JQ:=yes}
 REQUIRE_MZ=${REQUIRE_MZ:=yes}
+REQUIRE_MTOOLS=${REQUIRE_MTOOLS:=no}
 STABLE_MAC_ADDRS=${STABLE_MAC_ADDRS:=no}
 TCPDUMP_EXTRA_FLAGS=${TCPDUMP_EXTRA_FLAGS:=}
 
@@ -161,6 +162,12 @@ fi
 if [[ "$REQUIRE_MZ" = "yes" ]]; then
 	require_command $MZ
 fi
+if [[ "$REQUIRE_MTOOLS" = "yes" ]]; then
+	# https://github.com/vladimiroltean/mtools/
+	# patched for IPv6 support
+	require_command msend
+	require_command mreceive
+fi
 
 if [[ ! -v NUM_NETIFS ]]; then
 	echo "SKIP: importer does not define \"NUM_NETIFS\""
@@ -1548,6 +1555,37 @@ brmcast_check_sg_state()
 	done
 }
 
+mc_join()
+{
+	local if_name=$1
+	local group=$2
+	local vrf_name=$(master_name_get $if_name)
+
+	# We don't care about actual reception, just about joining the
+	# IP multicast group and adding the L2 address to the device's
+	# MAC filtering table
+	ip vrf exec $vrf_name \
+		mreceive -g $group -I $if_name > /dev/null 2>&1 &
+	mreceive_pid=$!
+
+	sleep 1
+}
+
+mc_leave()
+{
+	kill "$mreceive_pid" && wait "$mreceive_pid"
+}
+
+mc_send()
+{
+	local if_name=$1
+	local groups=$2
+	local vrf_name=$(master_name_get $if_name)
+
+	ip vrf exec $vrf_name \
+		msend -g $groups -I $if_name -c 1 > /dev/null 2>&1
+}
+
 start_ip_monitor()
 {
 	local mtype=$1; shift
-- 
2.25.1