[Oisf-users] nfq_set_mark question

kay kay.diam at gmail.com
Wed Jul 11 14:29:36 UTC 2012

Dear Eric,

Here is the part of source-nfq.c:

... ... ...
    do {
        switch (nfq_config.mode) {
            case NFQ_ACCEPT_MODE:
            case NFQ_ROUTE_MODE:
                if (p->flags & PKT_MARK_MODIFIED) {
... ... ...

You can see that NFQ_ACCEPT_MODE doesn't do anything, that is why I am
confused. Maybe I'm a dummy but I could not find the code where packet
is being marked by rule in accept mode.

2) Finally I figured out my mistake. My iptables counter rule was:

-A INPUT -m mark --mark 0x80/0x80 -j ACCEPT

but should be:

-A INPUT -m mark --mark 0x80/0x80

3) My dreams come false. But to be sure I'll ask you once again, is
there any possibility to redirect marked traffic to honeypot in

2012/7/11 Eric Leblond <eric at regit.org>:
> Hello,
> Le mercredi 11 juillet 2012 à 17:21 +0400, kay a écrit :
>> Dear Eric,
>> Don't apologize for the late answer, its ok. I have broken my mind
>> several times, but got new skills =)
>> Thank you very much, it works now. But I have questions:
>> 1) I can not understand why you commented out the following strings:
>> > #  mode: accept
>> > #  repeat_mark: 1
>> > #  repeat_mask: 1
>> > #  route_queue: 2
>> I reviewed suricata sources and noticed that "nfq_set_verdict2" is
>> being used only with NFQ_ROUTE_MODE or NFQ_REPEAT_MODE cases
>> (source-nfq.c). How does it work in ACCEPT mode?
> nfq_set_verdict2 is only used if we need to do advanced stuff on the
> packet. The idea behind not using it in all case was to avoid adding
> backward compatiblity code for people not having the v2.
>> 2) What is the sense and reason to use "repeat" mode and
>> repeat_mark/repeat_mask options if the marking functions in the
>> "accept mode" only and the marking can be implemented via rules?
> As said in my previous mail, I gave you AN answer to your question.
> Marking work for repeat mode:
> -A INPUT -p tcp -m tcp --dport 80 -m mark ! --mark 0x1/0x1 -j NFQUEUE --queue-num 0 --queue-bypass
> -A INPUT -m mark --mark 0x80/0x80
> -A INPUT -m mark --mark 0x1/0x1
> with a suricata.yaml modified:
> nfq:
>   mode: repeat
>   repeat_mark: 1
>   repeat_mask: 1
>> 3) Why I can't catch marked packed in "nat" table but can catch in
>> "mangle" table?
> Please reread my initial mail:
> http://lists.openinfosecfoundation.org/pipermail/oisf-users/2012-July/001799.html
> It explains that nat table is only used for the packet which do not
> belong to an established connection. Thus you can't see the packet with
> content.
> BR,

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