netdev - [PATCH net-next 5/8] selftests: forwarding: add helper for retrieving IPv6 link-local address of interface

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Date:   Fri, 22 Apr 2022 13:15:01 +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 5/8] selftests: forwarding: add helper for retrieving IPv6 link-local address of interface

Pinging an IPv6 link-local multicast address selects the link-local
unicast address of the interface as source, and we'd like to monitor for
that in tcpdump.

Add a helper to the forwarding library which retrieves the link-local
IPv6 address of an interface, to make that task easier.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 15fb46b39fe8..5386c826e46a 100755
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -868,6 +868,15 @@ mac_get()
 	ip -j link show dev $if_name | jq -r '.[]["address"]'
 }
 
+ipv6_lladdr_get()
+{
+	local if_name=$1
+
+	ip -j addr show dev $if_name | \
+		jq -r '.[]["addr_info"][] | select(.scope == "link").local' | \
+		head -1
+}
+
 bridge_ageing_time_get()
 {
 	local bridge=$1
-- 
2.25.1