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#!/bin/bash
have_socat="no"
socat -h > /dev/null && have_socat="yes"
ip link set lo up
$NFT -f /dev/stdin <<EOF
table inet t {
counter nomatchc {}
counter sackpermc {}
counter maxsegc {}
counter nopc {}
chain c {
type filter hook output priority 0;
tcp dport != 22345 accept
tcp flags & (fin | syn | rst | ack ) == syn tcp option 254 length ge 4 counter name nomatchc drop
tcp flags & (fin | syn | rst | ack ) == syn tcp option fastopen length ge 2 reset tcp option fastopen counter name nomatchc
tcp flags & (fin | syn | rst | ack ) == syn tcp option sack-perm missing counter name nomatchc
tcp flags & (fin | syn | rst | ack) == syn tcp option sack-perm exists counter name sackpermc
tcp flags & (fin | syn | rst | ack) == syn tcp option maxseg size gt 1400 counter name maxsegc
tcp flags & (fin | syn | rst | ack) == syn tcp option nop missing counter name nomatchc
tcp flags & (fin | syn | rst | ack) == syn tcp option nop exists counter name nopc
tcp flags & (fin | syn | rst | ack) == syn drop
}
}
EOF
if [ $? -ne 0 ]; then
exit 1
fi
if [ $have_socat != "yes" ]; then
echo "Ran partial test, socat not available (skipped)"
exit 77
fi
# This will fail (drop in output -> connect fails with eperm)
socat -u STDIN TCP:127.0.0.1:22345,connect-timeout=1 < /dev/null > /dev/null
# can't validate via dump file, syn rexmit can cause counters to be > 1 in rare cases.
$NFT list counter inet t nomatchc
# nomatchc must be 0.
$NFT list counter inet t nomatchc | grep -q "packets 0" || exit 1
# these counters must not be 0.
for nz in sackpermc maxsegc nopc; do
$NFT list counter inet t $nz
$NFT list counter inet t $nz | grep -q "packets 0" && exit 1
done
exit 0
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