commit f3335031b9452baebfe49b8b5e55d3fe0c4677d1
author Eric Dumazet <edumazet@google.com> Sat Oct 27 02:26:17 2012 +0000
committer David S. Miller <davem@davemloft.net> Wed Oct 31 14:00:15 2012 -0400
tree c73f4d2827d3b58b4866488a35b4b462e52713ba
parent 0f6ae8f14e7a6a068e9a98a0d3484ffa6bf2c6bb

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>