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selftests: cmsg_ipv6: repeat the exact packet

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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: 9657ad09e1 ("selftests: net: test IPV6_TCLASS")
Fixes: 05ae83d5a4 ("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>
This commit is contained in:
Jakub Kicinski 2024-02-04 08:56:18 -08:00 committed by David S. Miller
parent 38cc3c6dcc
commit 4b00d0c513
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/net/cmsg_ipv6.sh
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@ -89,7 +89,7 @@ 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
@ -126,7 +126,7 @@ 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