selftests: mptcp: fix ipv6 routing setup

MPJ ipv6 selftests currently lack per link route to the server
net. Additionally, ipv6 subflows endpoints are created without any
interface specified. The end-result is that in ipv6 self-tests
subflows are created all on the same link, leading to expected delays
and sporadic self-tests failures.

Fix the issue by adding the missing setup bits.

Fixes: 523514ed0a99 ("selftests: mptcp: add ADD_ADDR IPv6 test cases")
Reported-and-tested-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 27d0eb9..b8bdbec 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -75,6 +75,7 @@ init()
 
                # let $ns2 reach any $ns1 address from any interface
                ip -net "$ns2" route add default via 10.0.$i.1 dev ns2eth$i metric 10$i
+               ip -net "$ns2" route add default via dead:beef:$i::1 dev ns2eth$i metric 10$i
        done
 }
 
@@ -1476,7 +1477,7 @@ ipv6_tests()
        reset
        ip netns exec $ns1 ./pm_nl_ctl limits 0 1
        ip netns exec $ns2 ./pm_nl_ctl limits 0 1
-       ip netns exec $ns2 ./pm_nl_ctl add dead:beef:3::2 flags subflow
+       ip netns exec $ns2 ./pm_nl_ctl add dead:beef:3::2 dev ns2eth3 flags subflow
        run_tests $ns1 $ns2 dead:beef:1::1 0 0 0 slow
        chk_join_nr "single subflow IPv6" 1 1 1
 
@@ -1511,7 +1512,7 @@ ipv6_tests()
        ip netns exec $ns1 ./pm_nl_ctl limits 0 2
        ip netns exec $ns1 ./pm_nl_ctl add dead:beef:2::1 flags signal
        ip netns exec $ns2 ./pm_nl_ctl limits 1 2
-       ip netns exec $ns2 ./pm_nl_ctl add dead:beef:3::2 flags subflow
+       ip netns exec $ns2 ./pm_nl_ctl add dead:beef:3::2 dev ns2eth3 flags subflow
        run_tests $ns1 $ns2 dead:beef:1::1 0 -1 -1 slow
        chk_join_nr "remove subflow and signal IPv6" 2 2 2
        chk_add_nr 1 1