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<base href="https://bugzilla.netfilter.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - nftables.py cmd doesn't read updated counter values after first read"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1386">1386</a>
</td>
</tr>
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<th>Summary</th>
<td>nftables.py cmd doesn't read updated counter values after first read
</td>
</tr>
<tr>
<th>Product</th>
<td>nftables
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>x86_64
</td>
</tr>
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<th>OS</th>
<td>Gentoo
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
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<th>Priority</th>
<td>P5
</td>
</tr>
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<th>Component</th>
<td>nft
</td>
</tr>
<tr>
<th>Assignee</th>
<td>pablo@netfilter.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>karel@unitednetworks.cz
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=577" name="attach_577" title="example of nftables.py not reading updated counter state">attachment 577</a> <a href="attachment.cgi?id=577&action=edit" title="example of nftables.py not reading updated counter state">[details]</a></span>
example of nftables.py not reading updated counter state
System:
Gentoo 5.4.1 x86_64
nft up to date from GIT as of 4.12.2019
CPython 3.6.9
Overview:
nft commands which read named counters actually read counter values only first
time, subsequent reads returns values from first read.
Detailed info:
Consider this ruleset:
add table ip table1
add counter ip table1 counter1
add chain ip table1 chain1 { type filter hook input priority 0; }
add rule ip table1 chain1 counter name counter1
Then ping several times localhost, after that call nftables.py cmd:
list counter table1 counter1
and you will see some packets added to this counter. Ping localhost several
times again and call nftables.py cmd again:
list counter table1 counter1
and you will see same counter values as in first call without adding some
packets from second pinging. But when running nft from shell:
nft list counter table1 counter1
the values returned will be different from second call through nftables.py cmd
and will account packets from second pinging.
See attached example.</pre>
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