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filter: introduce SKF_AD_VLAN_TPID BPF extension

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If vlan offloading takes place then vlan header is removed from frame
and its contents, both vlan_tci and vlan_proto, is available to user
space via TPACKET interface. However, only vlan_tci can be used in BPF
filters.

This commit introduces a new BPF extension. It makes possible to load
the value of vlan_proto (vlan TPID) to register A. Support for classic
BPF and eBPF is being added, analogous to skb->protocol.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Jiri Pirko <jpirko@redhat.com>

Signed-off-by: Michal Sekletar <msekleta@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Reviewed-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Sekletar
2015-03-24 14:48:41 +01:00
committed by David S. Miller
parent f6bb76cd4d
commit 27cd545247
7 changed files with 35 additions and 3 deletions
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3
Documentation/networking/filter.txt
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@@ -280,7 +280,8 @@ Possible BPF extensions are shown in the following table:
rxhash skb->hash
cpu raw_smp_processor_id()
vlan_tci skb_vlan_tag_get(skb)
vlan_pr skb_vlan_tag_present(skb)
vlan_avail skb_vlan_tag_present(skb)
vlan_tpid skb->vlan_proto
rand prandom_u32()
These extensions can also be prefixed with '#'.