netdev - Re: [Patch net] net: allow setting mac address of loopback device

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Message-ID: <20140130144248.GE25336@order.stressinduktion.org>
Date:	Thu, 30 Jan 2014 15:42:48 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net] net: allow setting mac address of loopback device

On Wed, Jan 29, 2014 at 03:38:51PM -0800, Cong Wang wrote:
> We are trying to mirror the local traffic from lo to eth0,
> allowing setting mac address of lo to eth0 would make
> the ether addresses in these packets correct, so that
> we don't have to modify the ether header again.
> 
> Since usually no one cares about its mac address (all-zero),
> it is safe to allow those who care to set its mac address.
> 
> Cc: Stephen Hemminger <stephen@...workplumber.org>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: David S. Miller <davem@...emloft.net>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> 
> ---
> diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
> index c5011e0..a0ee030 100644
> --- a/drivers/net/loopback.c
> +++ b/drivers/net/loopback.c
> @@ -160,6 +160,7 @@ static const struct net_device_ops loopback_ops = {
>  	.ndo_init      = loopback_dev_init,
>  	.ndo_start_xmit= loopback_xmit,
>  	.ndo_get_stats64 = loopback_get_stats64,
> +	.ndo_set_mac_address = eth_mac_addr,
>  };

IFF_LIVE_ADDR_CHANGE would also be helpful to change mac address if loopback
is already up.

Also I doubt this is a change for net but for net-next.

Greetings,

  Hannes

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