From: Eric Dumazet <edumazet@google.com>
Date: Sat, 27 Oct 2012 02:26:17 +0000 (+0000)
Subject: net: filter: add vlan tag access
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~45^2~529
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3335031b9452baebfe49b8b5e55d3fe0c4677d1;p=pandora-kernel.git

net: filter: add vlan tag access

BPF filters lack ability to access skb->vlan_tci

This patch adds two new ancillary accessors :

SKF_AD_VLAN_TAG         (44) mapped to vlan_tx_tag_get(skb)

SKF_AD_VLAN_TAG_PRESENT (48) mapped to vlan_tx_tag_present(skb)

This allows libpcap/tcpdump to use a kernel filter instead of
having to fallback to accept all packets, then filter them in
user space.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Ani Sinha <ani@aristanetworks.com>
Suggested-by: Daniel Borkmann <danborkmann@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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