netdev - Re: [net-next v3] tipc: add loopback device tracking

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Message-Id: <20190808.221150.639978383290842870.davem@davemloft.net>
Date:   Thu, 08 Aug 2019 22:11:50 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     john.rutherford@...tech.com.au
Cc:     netdev@...r.kernel.org, tipc-discussion@...ts.sourceforge.net
Subject: Re: [net-next v3] tipc: add loopback device tracking

From: john.rutherford@...tech.com.au
Date: Wed,  7 Aug 2019 12:52:29 +1000

> From: John Rutherford <john.rutherford@...tech.com.au>
> 
> Since node internal messages are passed directly to the socket, it is not
> possible to observe those messages 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 enabled if network taps are active for the loopback device.
> pcap filtering restrictions require the messages to be presented to the
> receiving side of the loopback device.
> 
> v3 - Function dev_nit_active used to check for network taps.
>    - Procedure netif_rx_ni used to send cloned messages to loopback device.
> 
> Signed-off-by: John Rutherford <john.rutherford@...tech.com.au>
> Acked-by: Jon Maloy <jon.maloy@...csson.com>
> Acked-by: Ying Xue <ying.xue@...driver.com>

Applied, thank you.