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Message-Id: <20230803-upstream-net-20230803-misc-fixes-6-5-v1-1-6671b1ab11cc@tessares.net>
Date:   Thu, 03 Aug 2023 18:27:27 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Geliang Tang <geliang.tang@...e.com>
Cc:     Andrea Claudi <aclaudi@...hat.com>, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        stable@...r.kernel.org
Subject: [PATCH net 1/4] selftests: mptcp: join: fix 'delete and re-add'
 test

From: Andrea Claudi <aclaudi@...hat.com>

mptcp_join 'delete and re-add' test fails when using ip mptcp:

  $ ./mptcp_join.sh -iI
  <snip>
  002 delete and re-add                    before delete[ ok ]
                                           mptcp_info subflows=1         [ ok ]
  Error: argument "ADDRESS" is wrong: invalid for non-zero id address
                                           after delete[fail] got 2:2 subflows expected 1

This happens because endpoint delete includes an ip address while id is
not 0, contrary to what is indicated in the ip mptcp man page:

"When used with the delete id operation, an IFADDR is only included when
the ID is 0."

This fixes the issue using the $addr variable in pm_nl_del_endpoint()
only when id is 0.

Fixes: 34aa6e3bccd8 ("selftests: mptcp: add ip mptcp wrappers")
Cc: stable@...r.kernel.org
Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 3c2096ac97ef..067fabc401f1 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -705,6 +705,7 @@ pm_nl_del_endpoint()
 	local addr=$3
 
 	if [ $ip_mptcp -eq 1 ]; then
+		[ $id -ne 0 ] && addr=''
 		ip -n $ns mptcp endpoint delete id $id $addr
 	else
 		ip netns exec $ns ./pm_nl_ctl del $id $addr

-- 
2.40.1

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