Commit 25f929fb authored Feb 11, 2014 by WANG Cong Committed by David S. Miller Feb 13, 2014

net: allow setting mac address of loopback device



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: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 0e42aa4f

drivers/net/loopback.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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,
		};

		/*
		@@ -174,6 +175,7 @@ static void loopback_setup(struct net_device *dev)
		dev->tx_queue_len = 0;
		dev->type = ARPHRD_LOOPBACK; /* 0x0001*/
		dev->flags = IFF_LOOPBACK;
		dev->priv_flags \|= IFF_LIVE_ADDR_CHANGE;
		dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
		dev->hw_features = NETIF_F_ALL_TSO \| NETIF_F_UFO;
		dev->features = NETIF_F_SG \| NETIF_F_FRAGLIST

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