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Date:      Fri, 16 Oct 2009 16:12:16 -0700
From:      Chris St Denis <chris@smartt.com>
To:        Jason Lewis <me@sharktooth.org>
Cc:        freebsd-ipfw@freebsd.org, Freddie Cash <fjwcash@gmail.com>
Subject:   Re: ipfw: install_state: entry already present, done
Message-ID:  <4AD8FDD0.30008@smartt.com>
In-Reply-To: <4ACF9341.2040406@smartt.com>
References:  <4AC51F18.5050703@smartt.com>	<b269bc570910011455i7fd46379p720a38a7ff50260e@mail.gmail.com>	<4AC52918.2020705@smartt.com>	<8d923f617db88c873c63bb2038752147.squirrel@users.sharktooth.org> <4ACF9341.2040406@smartt.com>

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This is definitely a regression in 7.2.

Downgrades to 6.4, 7.0, 7.1 did not show this symptom. Upgrade the test 
server back to 7.2 and the messages come back.


Chris St Denis wrote:
> check_state doesn't help. The error is also generated from the rc.conf 
> firewall_type="workstation" rule set which includes check_state among 
> several other rules.
>
> I made a copy of this server (it's a virtual server under WMware) and 
> downgraded it to 6.4-RELEASE-p7 and I no longer get the error.
>
> I downgraded another copy to 7.2-RELEASE (no patches) by copying the 
> generic kernel off the CD. Still gets errors.
>
> Downgraded it to 7.0-RELEASE and the message stopped.
>
> I'm going to try going to 7.1 and see which behavior it has.
>
> Looks like there may have been a regression in 7.2 (or maybe 7.1 
> pending the results of my further testing)
>
>
> Jason Lewis wrote:
>> Did you try a check_state?  I am using this same rule structure on BSD6
>> without a problem.
>>
>> Thanks,
>> Jason
>> http://jasonlewis.yaritz.net
>>
>>  
>>> Freddie Cash wrote:
>>>    
>>>> On Thu, Oct 1, 2009 at 2:28 PM, Chris St Denis <chris@smartt.com> 
>>>> wrote:
>>>>
>>>>
>>>>      
>>>>> Haven't gotten any response on -questions so trying here. I've also
>>>>> opened
>>>>> a PR (kern/139226) but it's gotten no replies so I figured I 
>>>>> should try
>>>>> here
>>>>> since I'm not certain if it's a bug or not. Regardless I am hoping 
>>>>> for
>>>>> at
>>>>> least a work-around -- a few extra rules or settings to keep my 
>>>>> console
>>>>> from
>>>>> being flooded by errors. So far only option I found is commenting out
>>>>> the
>>>>> error display line in the kernel source which is far from optimal.
>>>>>
>>>>> I'm trying to setup a stateful firewall for my server such that any
>>>>> traffic
>>>>> can go out, and it's reply come back -- a fairly typical workstation
>>>>> setup.
>>>>> However I'm getting the error message "ipfw: install_state: entry
>>>>> already
>>>>> present, done" repeated many times in my logs (tho the rules 
>>>>> seemed to
>>>>> work
>>>>> fine otherwise).
>>>>>
>>>>> I stripped down the rules to the minimum I could and discovered the
>>>>> line
>>>>> causing it is "allow udp from me to any keep-state".
>>>>>
>>>>> Only seems to happen when I have bind running as a slave dns server
>>>>> (not
>>>>> publicly listed, just the zone replication traffic causes the error)
>>>>> but I
>>>>> assume any other large source of UDP traffic would also do it.
>>>>>
>>>>> Full firewall rules:
>>>>>
>>>>>   dns2# ipfw list
>>>>>   00100 allow ip from any to any via lo0
>>>>>   00200 deny ip from any to 127.0.0.0/8
>>>>>   00300 deny ip from 127.0.0.0/8 to any
>>>>>   00400 allow udp from me to any keep-state
>>>>>   65535 deny ip from any to any
>>>>>
>>>>>
>>>>>
>>>>>         
>>>> If you add "out xmit em0" to the udp rule, do the errors stop
>>>>       
>>> I added that and restarted bind (thus generating a bunch of UDP 
>>> traffic)
>>> and the error still floods the console.
>>>
>>> Current rule set:
>>> 00100 allow ip from any to any via lo0
>>> 00200 deny ip from any to 127.0.0.0/8
>>> 00300 deny ip from 127.0.0.0/8 to any
>>> 00400 allow udp from me to any out xmit em0 keep-state
>>> 00500 allow ip from any to any
>>> 65535 deny ip from any to any
>>>
>>> _______________________________________________
>>> freebsd-ipfw@freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw
>>> To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org"
>>>
>>>     
>>
>>
>> _______________________________________________
>> freebsd-ipfw@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw
>> To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org"
>>   
>
>


-- 
Chris St Denis
Programmer
SmarttNet (www.smartt.com)
Ph: 604-473-9700 Ext. 200
-------------------------------------------
"Smart Internet Solutions For Businesses" 




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