[PATCH 6.4 016/206] selftests: mptcp: join: fix delete and re-add test

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From: Andrea Claudi <aclaudi@xxxxxxxxxx>

commit aaf2123a5cf46dbd97f84b6eee80269758064d93 upstream.

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@xxxxxxxxxxxxxxx
Signed-off-by: Andrea Claudi <aclaudi@xxxxxxxxxx>
Reviewed-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Signed-off-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230803-upstream-net-20230803-misc-fixes-6-5-v1-1-6671b1ab11cc@xxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh |    1 +
 1 file changed, 1 insertion(+)

--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -676,6 +676,7 @@ 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





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