netdev - Rtnelink and notifcations: a question.

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Message-ID: <CAF0Lin08QxdKRTXUJOuHeRBwfueUks0Scrx+c5FjZmA_4+FNSA@mail.gmail.com>
Date:	Wed, 22 May 2013 09:13:36 +0300
From:	Andy Johnson <johnsonzjo@...il.com>
To:	netdev@...r.kernel.org
Subject: Rtnelink and notifcations: a question.

Hello,

This is a theoretical question (sorry,-)). I was wondering why do we
need both rtnetlink
kernel sockets and the notification API ?
For example,
in net/core/dev.c,
we use notification to send NETDEV_REGISTER event notification in:
call_netdevice_notifiers(NETDEV_REGISTER, dev);
and we use the rtnetlink to send RTM_NEWLINK message:
rtmsg_ifinfo(RTM_NEWLINK,...);

Is it possible to use only the rtnetlink API and to send events like
NETDEV_REGISTER with rtnetlink methods ?

Or is there something inherent with rtnetlink/notification that
prevents implementing in
this way ?

I believe that the other way (solely using notification API) is not
possible because
we need to support getting messages
from userspace (for example, with the iproute package).

Regards,
Andy
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