netdev - Re: problem with flowi structure

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Message-ID: <AANLkTi=hXc_ijNgxW+Q6jkRP_T1zjyy2mvKAdTSgeh7w@mail.gmail.com>
Date:	Fri, 17 Sep 2010 20:25:23 +0200
From:	Nicola Padovano <nicola.padovano@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	AIJAZ BAIG <aijazbaig1@...il.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: problem with flowi structure

On Fri, Sep 17, 2010 at 8:07 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le vendredi 17 septembre 2010 à 20:01 +0200, Nicola Padovano a écrit :
>> > if you say now :
>> >
>> > Send a packet to google, please, I dont care of what source address you
>> > chose, but I am interested to receive an answer, of course. (application
>> > does not use bind() system call, only a send())
>>
>> why an application that wants to send a packet to google would send it
>> with a different source ip of the host in which it resides?
>> ie. an application is on a machine which ip is: 192.168.0.2 and the
>> machine has only one ip address...
>>
>
> I dont understand the question or the problem.
>
> If you look closer, you can see your machine has at least two addresses.

ok, let's try in this way.

the code is this:

[CODE]
if (hooknumber == NF_INET_LOCAL_IN) fl.nl_u.ip4_u.saddr = niph->saddr;
  //niph is the pointer to ip header of the packet to send
if (hooknumber == NF_INET_FORWARD) fl.nl_u.ip4_u.saddr = 0;
[/CODE]

so, i don't understand why saddr = 0 when the hooknumber is NF_INET_FORWARD....

this is the real problem.

-- 
Nicola Padovano
e-mail: nicola.padovano@...il.com
web: http://npadovano.altervista.org
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