netdev - Re: [net-next v2] tipc: add loopback device tracking

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Message-Id: <20190624.072918.1626161455453937687.davem@davemloft.net>
Date:   Mon, 24 Jun 2019 07:29:18 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     john.rutherford@...tech.com.au
Cc:     netdev@...r.kernel.org
Subject: Re: [net-next v2] tipc: add loopback device tracking

From: john.rutherford@...tech.com.au
Date: Mon, 24 Jun 2019 16:44:35 +1000

> Since node internal messages are passed directly to socket it is not
> possible to observe this message exchange via tcpdump or wireshark.
> 
> We now remedy this by making it possible to clone such messages and send
> the clones to the loopback interface.  The clones are dropped at reception
> and have no functional role except making the traffic visible.
> 
> The feature is turned on/off by enabling/disabling the loopback "bearer"
> "eth:lo".
> 
> Acked-by: Jon Maloy <jon.maloy@...csson.com>
> Signed-off-by: John Rutherford <john.rutherford@...tech.com.au>

What a waste, just clone the packet, attach loopback to it, and go:

	if (dev_nit_active(loopback_dev))
		dev_queue_xmit_nit(skb, loopback_dev);