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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 - Current conntrack state isn't considered when evaluating multiple SNAT rules"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1227">1227</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Current conntrack state isn't considered when evaluating multiple SNAT rules
</td>
</tr>
<tr>
<th>Product</th>
<td>netfilter/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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P5
</td>
</tr>
<tr>
<th>Component</th>
<td>NAT
</td>
</tr>
<tr>
<th>Assignee</th>
<td>netfilter-buglog@lists.netfilter.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>richard@helix.net.nz
</td>
</tr></table>
<p>
<div>
<pre>If multiple SNAT rules exist with specific sport ranges, only the first
matching entry is evaluated even when the sport range is exhausted.
Example:
root@LEDE:~# iptables -nvL POSTROUTING -t nat
Chain POSTROUTING (policy ACCEPT 127 packets, 8757 bytes)
pkts bytes target prot opt in out source destination
3618 215K postrouting_rule all -- * * 0.0.0.0/0
0.0.0.0/0 /* !fw3: user chain for postrouting */
9 616 SNAT icmp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 0 */ to:2.127.254.0:1088-1151
2661 139K SNAT tcp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 1 */ to:2.127.254.0:1088-1151
821 66973 SNAT udp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 2 */ to:2.127.254.0:1088-1151
0 0 SNAT icmp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 3 */ to:2.127.254.0:2112-2175
0 0 SNAT tcp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 4 */ to:2.127.254.0:2112-2175
0 0 SNAT udp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 5 */ to:2.127.254.0:2112-2175
0 0 SNAT icmp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 6 */ to:2.127.254.0:3136-3199
0 0 SNAT tcp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 7 */ to:2.127.254.0:3136-3199
0 0 SNAT udp -- * map-mapt0 0.0.0.0/0
0.0.0.0/0 /* !fw3: ubus:mapt0[map] nat 8 */ to:2.127.254.0:3136-3199
For some additional context, when implementing RFC7597 or RFC7599, the
netfilter device may only have permission to use a subset of an IPv4 address'
65535 ports.
The ports that this particular device is allowed to use, may also be carved up
in to multiple non-contiguous blocks, as per the above example.</pre>
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</p>
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