netdev - Parse ethernet headers in af

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Date:	Wed, 31 Jul 2013 19:27:44 +0200
From:	Phil Sutter <phil@....cc>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Parse ethernet headers in af_packet.c

Hi,

This is an AF_PACKET specific solution to the problems discussed in [1]
and [2].

Basically this incorporates calling eth_type_trans() for packets to send
when the outgoing device's type is ARPHRD_ETHER.

In order to having a more generic solution which could be used in other
places (like e.g. tun.c), I second Michael's approach in [2], but would
extend it to a generic equivalent to eth_type_trans(). A device-type
specific layer-2 header parser if you will. Note that eth_type_trans()
also sets skbuff's dev, pkt_type and mac_header fields. A
dev->header_ops->type_trans() could do just that plus set skb->protocol
(maybe only if it's ETH_P_ALL).

[1] http://patchwork.ozlabs.org/patch/67422/
[2] http://lists.openwall.net/netdev/2010/01/06/38

Best wishes, Phil

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