Re: Problem setting up nftables dnat : dport set to 0 instead of requested value (22)

[leroy christophe <christophe.leroy@c-s.fr>]

Le 11/12/2014 14:12, leroy christophe a écrit :
>
> Le 10/12/2014 19:22, Pablo Neira Ayuso a écrit :
>> On Wed, Dec 10, 2014 at 03:39:04PM +0100, leroy christophe wrote:
>>> Hi,
>>>
>>> I'm trying to redirect incoming tcp connections for port 222 to
>>> local port 22 (because I will dnat incoming connections for port 22
>>> to another destination).
>> Then you have to use "redirect" instead of "dnat". "redirect" will be
>> available since the upcoming 3.19-rc.
>>
>> Cc'ing Arturo, he has worked on the redirect support.
>>
>> @Arturo: Could you add documentation for your 'redirect' support to ?
>>
>> http://wiki.nftables.org/wiki-nftables/index.php/Performing_Network_Address_Translation_%28NAT%29 
>>
>>
>> Thanks.
>>
> Thanks for the information.
>
> I have now applied patches 8d13edd, 9de920e and e9105f1 on my 3.18 
> kernel, so now the redirect rule is accepted, but I still get the same 
> issue: dport gets value 0 instead of 22 after the redirect, see below
>
> Is there any other patch to apply ?
>
> Christophe
>
Issue identified. I'll write another mail to explain it.

Christophe
>
> [  932.304106] redir IN=eth0 OUT= 
> MAC=08:00:51:20:44:5b:08:00:27:fe:42:1e:08:00 SRC=172.25.231.37 
> DST=172.25.231.5 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=22863 DF 
> PROTO=TCP SPT=55116 DPT=222 WINDOW=14600 RES=0x00 SYN URGP=0
> [  932.304523] rejected IN=eth0 OUT= 
> MAC=08:00:51:20:44:5b:08:00:27:fe:42:1e:08:00 SRC=172.25.231.37 
> DST=172.25.231.5 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=22863 DF 
> PROTO=TCP SPT=55116 DPT=0 WINDOW=14600 RES=0x00 SYN URGP=0
>