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<base href="https://bugzilla.netfilter.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Using certain simple set combinations with TCP flags causes error in mergesort.c from nft list ruleset"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1450">1450</a>
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<th>Summary</th>
<td>Using certain simple set combinations with TCP flags causes error in mergesort.c from nft list ruleset
</td>
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<th>Product</th>
<td>nftables
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>arm
</td>
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<th>OS</th>
<td>Ubuntu
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P5
</td>
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<th>Component</th>
<td>nft
</td>
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<th>Assignee</th>
<td>pablo@netfilter.org
</td>
</tr>
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<th>Reporter</th>
<td>phillc@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>When setting up some TCP flag rules I attempted to combine multiple flag
combinations into one rule with a simple set.
The following works perfectly
tcp flags == {syn, syn|ack} accept
tcp flags & (fin|syn|rst|psh|ack|urg) == {ack, psh|ack, fin} accept
tcp flags & (fin|syn|rst|psh|ack|urg) == psh|ack|fin accept
It can be applied with nft -f and displays with "nft list ruleset"
However, when trying to do this:
tcp flags == {syn, syn|ack} accept
tcp flags & (fin|syn|rst|psh|ack|urg) == {ack, psh|ack, fin, fin|psh|ack}
accept
nft -f applies without any error, but running "nft list ruleset" returns:
BUG: Unknown expression binop
nft: mergesort.c:47: expr_msort_cmp: Assertion `0' failed.
Aborted (core dumped)
OS: Ubuntu 20.04
Kernel: Ubuntu 5.4.0-1015.15-raspi 5.4.44
nftables/focal,now 0.9.3-2 arm64</pre>
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