[Bug 606] New: Iptables-restore removing the wrong rules

[bugzilla-daemon at bugzilla.netfilter.org]

http://bugzilla.netfilter.org/show_bug.cgi?id=606

           Summary: Iptables-restore removing the wrong rules
           Product: iptables
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: iptables-restore
        AssignedTo: laforge at netfilter.org
        ReportedBy: me at jacobsvensson.se


I'm having some troubles with a set of iptable rules. When setting the
sequence with iptables everything is fine, but if I'm using
iptables-restore, the wrong rules get removed at a certain point.
This is the smallest subset of rules that i have been able to find
that reproduce the problem.
As you can see, when trying to remove the rules ending with 60007, the
60009 are removed.

Looks like a bug, but perhaps I am just misunderstanding something?
I've been able to reproduce it on both 1.3.8 and 1.4.4 and on both mips and
x86.

-------------------------

user at user-laptop:~$ sudo iptables -t nat -L -n
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
test_POSTROUTING  all  --  0.0.0.0/0            0.0.0.0/0

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
test_OUTPUT  all  --  0.0.0.0/0            0.0.0.0/0

Chain test_OUTPUT (1 references)
target     prot opt source               destination

Chain test_POSTROUTING (1 references)
target     prot opt source               destination
user at user-laptop:~$ sudo iptables-restore -n
*nat
-F
COMMIT
*mangle
-F
COMMIT
*nat
-X
COMMIT
*mangle
-X
COMMIT
*nat
-N test_POSTROUTING
-I POSTROUTING -j test_POSTROUTING
-N test_OUTPUT
-I OUTPUT -j test_OUTPUT
COMMIT
*mangle
-N test_POSTROUTING
-I POSTROUTING -j test_POSTROUTING
COMMIT
*nat
-I test_POSTROUTING -p udp -s 192.168.1.5 --sport 50001 -d 192.168.1.5
--dport 40001 -j SNAT --to 192.168.1.1:60007
-I test_POSTROUTING -p udp -s 192.168.1.5 --sport 40001 -d 192.168.1.5
--dport 50001 -j SNAT --to 10.76.50.70:60007
COMMIT
*mangle
-I test_POSTROUTING -p udp -s 192.168.1.5 --sport 40000 -d 192.168.1.5
--dport 50000 -j DSCP --set-dscp 46
COMMIT
*nat
-I test_POSTROUTING -p udp -s 192.168.1.5 --sport 50001 -d 192.168.1.5
--dport 40001 -j SNAT --to 192.168.1.1:60009
-I test_POSTROUTING -p udp -s 192.168.1.5 --sport 40001 -d 192.168.1.5
--dport 50001 -j SNAT --to 10.76.50.70:60009
COMMIT
*nat
-D test_POSTROUTING -p udp -s 192.168.1.5 --sport 50001 -d 192.168.1.5
--dport 40001 -j SNAT --to 192.168.1.1:60007
-D test_POSTROUTING -p udp -s 192.168.1.5 --sport 40001 -d 192.168.1.5
--dport 50001 -j SNAT --to 10.76.50.70:60007
COMMIT
user at user-laptop:~$ sudo iptables -t nat -L -n
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
test_POSTROUTING  all  --  0.0.0.0/0            0.0.0.0/0

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
test_OUTPUT  all  --  0.0.0.0/0            0.0.0.0/0

Chain test_OUTPUT (1 references)
target     prot opt source               destination

Chain test_POSTROUTING (1 references)
target     prot opt source               destination
SNAT       udp  --  192.168.1.5          192.168.1.5         udp
spt:40001 dpt:50001 to:10.76.50.70:60007
SNAT       udp  --  192.168.1.5          192.168.1.5         udp
spt:50001 dpt:40001 to:192.168.1.1:60007

----------------------------------

Best Regards
Jacob Svensson


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