From: ddvlad@herebedragons.ro (Vlad Dogaru)
To: kernelnewbies@lists.kernelnewbies.org
Subject: How do we determine IP Address of interface the packet arrived on
Date: Wed, 24 Sep 2014 10:41:54 +0300 [thread overview]
Message-ID: <20140924074154.GB6880@vdogaru> (raw)
In-Reply-To: <CAHzLHWrsqOeCPaj_EZGOJLhrU=3K+tbQdmaeEdX8wrq1T=0Uzw@mail.gmail.com>
On Wed, Sep 24, 2014 at 10:19:34AM +0530, Maninder Singh wrote:
> Hi,
>
> Each time a packet arrives at a router in a subnet during transit, I
> need to determine the IP address of the incoming interface of the
> router for that packet. I have a netfilter kernel module running at
> each router but I dont understand which data structure will give me
> thw IP address. Can someone please suggest how shall I get that?
An interface can have more than one IP address, so your question is a
little strange.
However, you can find out all the IPv4 addresses a particular device has
by iterating through dev->ip_ptr->ifa_list.
Hope this helps,
Vlad
next prev parent reply other threads:[~2014-09-24 7:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-24 4:49 How do we determine IP Address of interface the packet arrived on Maninder Singh
2014-09-24 7:41 ` Vlad Dogaru [this message]
2014-09-24 12:03 ` 정현
2014-09-24 12:24 ` Valdis.Kletnieks at vt.edu
2014-09-24 14:08 ` John de la Garza
2014-09-24 16:22 ` Valdis.Kletnieks at vt.edu
2014-09-24 16:34 ` Jeff Haran
2014-09-25 3:14 ` maninder.tiet at gmail.com
2014-09-24 12:25 ` Valdis.Kletnieks at vt.edu
2014-09-25 3:20 ` Maninder Singh
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