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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 - noflush actually flushes in case of custom chain"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1242">1242</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>noflush actually flushes in case of custom chain
</td>
</tr>
<tr>
<th>Product</th>
<td>iptables
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P5
</td>
</tr>
<tr>
<th>Component</th>
<td>iptables-restore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>netfilter-buglog@lists.netfilter.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>assafcw@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Caught while trying to restore iptables with docker chains using:
iptables-restore -n -c MYFILE
The file might look like
*nat
:DOCKER
COMMIT
where the DOCKER chain already has rules in it, when restored - will be
flushed.
while in case of builtin chains - will not flush and duplicate the entry.
For instance:
*nat
-I PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
COMMIT
I believe the bug is in
iptables-restore.c
line 369
if (noflush && ops->is_chain(chain, handle)) {
DEBUGP("Flushing existing user defined chain '%s'\n",
chain);
if (!ops->flush_entries(chain, handle))
xtables_error(PARAMETER_PROBLEM,
"error flushing chain "
"'%s':%s\n", chain,
strerror(errno));
where it should be if(!noflush %% ops->...</pre>
</div>
</p>
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