netdev - [PATCH RFC net-next 05/13] selftests: forwarding: add TCPDUMP_EXTRA

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Date:   Mon, 11 Apr 2022 15:38:29 +0200
From:   Joachim Wiberg <troglobit@...il.com>
To:     Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>
Cc:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Joachim Wiberg <troglobit@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH RFC net-next 05/13] selftests: forwarding: add TCPDUMP_EXTRA_FLAGS to lib.sh

For some use-cases we may want to change the tcpdump flags used in
tcpdump_start().  For instance, observing interfaces without the PROMISC
flag, e.g. to see what's really being forwarded to the bridge interface.

Signed-off-by: Joachim Wiberg <troglobit@...il.com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 tools/testing/selftests/net/forwarding/lib.sh

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
old mode 100644
new mode 100755
index 664b9ecaf228..00cdcab7accf
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -1369,7 +1369,13 @@ tcpdump_start()
 		capuser="-Z $SUDO_USER"
 	fi
 
-	$ns_cmd tcpdump -e -n -Q in -i $if_name \
+	if [ -z $TCPDUMP_EXTRA_FLAGS ]; then
+		extra_flags=""
+	else
+		extra_flags="$TCPDUMP_EXTRA_FLAGS"
+	fi
+
+	$ns_cmd tcpdump $extra_flags -e -n -Q in -i $if_name \
 		-s 65535 -B 32768 $capuser -w $capfile > "$capout" 2>&1 &
 	cappid=$!
 
-- 
2.25.1