From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 24 Nov 2009 10:51:19 +0100
From: Patrick McHardy <kaber@trash.net>
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Subject: Re: [Bridge] [PATCH 1/4] veth: move loopback logic to common
	location
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>, Eric Dumazet <eric.dumazet@gmail.com>, Anna Fischer <anna.fischer@hp.com>, netdev@vger.kernel.org, bridge@lists.linux-foundation.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Mark Smith <lk-netdev@lk-netdev.nosense.org>, Gerhard Stenzel <gerhard.stenzel@de.ibm.com>, "Eric W. Biederman" <ebiederm@xmission.com>, Jens Osterkamp <jens@linux.vnet.ibm.com>, Patrick Mullaney <pmullaney@novell.com>, Stephen Hemminger <shemminger@vyatta.com>, Edge Virtual Bridging <evb@yahoogroups.com>, David Miller <davem@davemloft.net>

Arnd Bergmann wrote:
> +int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
> +{
> +	skb_orphan(skb);
> +
> +	if (!(dev->flags & IFF_UP))
> +		return NET_RX_DROP;
> +
> +	if (skb->len > (dev->mtu + dev->hard_header_len))
> +		return NET_RX_DROP;
> +
> +	skb_dst_drop(skb);
> +	skb->tstamp.tv64 = 0;
> +	skb->pkt_type = PACKET_HOST;
> +	skb->protocol = eth_type_trans(skb, dev);
> +	skb->mark = 0;

skb->mark clearing should stay private to veth since its usually
supposed to stay intact. The only exception is packets crossing
namespaces, where they should appear like a freshly received skbs.

> +	secpath_reset(skb);
> +	nf_reset(skb);
> +	return netif_rx(skb);
> +}
> +EXPORT_SYMBOL_GPL(dev_forward_skb);