selftests: cmsg_ipv6: repeat the exact packet

[ Upstream commit 4b00d0c513da58b68df015968721b11396fe4ab3 ]

cmsg_ipv6 test requests tcpdump to capture 4 packets,
and sends until tcpdump quits. Only the first packet
is "real", however, and the rest are basic UDP packets.
So if tcpdump doesn't start in time it will miss
the real packet and only capture the UDP ones.

This makes the test fail on slow machine (no KVM or with
debug enabled) 100% of the time, while it passes in fast
environments.

Repeat the "real" / expected packet.

Fixes: 9657ad09e1fa ("selftests: net: test IPV6_TCLASS")
Fixes: 05ae83d5a4a2 ("selftests: net: test IPV6_HOPLIMIT")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/testing/selftests/net/cmsg_ipv6.sh b/tools/testing/selftests/net/cmsg_ipv6.sh
index 330d0b1..c921750 100755 (executable)
--- a/tools/testing/selftests/net/cmsg_ipv6.sh
+++ b/tools/testing/selftests/net/cmsg_ipv6.sh
@@ -91,7 +91,7 @@ for ovr in setsock cmsg both diff; do
        check_result $? 0 "TCLASS $prot $ovr - pass"
 
        while [ -d /proc/$BG ]; do
-           $NSEXE ./cmsg_sender -6 -p u $TGT6 1234
+           $NSEXE ./cmsg_sender -6 -p $p $m $((TOS2)) $TGT6 1234
        done
 
        tcpdump -r $TMPF -v 2>&1 | grep "class $TOS2" >> /dev/null
@@ -128,7 +128,7 @@ for ovr in setsock cmsg both diff; do
        check_result $? 0 "HOPLIMIT $prot $ovr - pass"
 
        while [ -d /proc/$BG ]; do
-           $NSEXE ./cmsg_sender -6 -p u $TGT6 1234
+           $NSEXE ./cmsg_sender -6 -p $p $m $LIM $TGT6 1234
        done
 
        tcpdump -r $TMPF -v 2>&1 | grep "hlim $LIM[^0-9]" >> /dev/null