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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