bpf: add bpf_skb_adjust_room mode BPF_ADJ_ROOM_MAC

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bpf_skb_adjust_room net allows inserting room in an skb.

Existing mode BPF_ADJ_ROOM_NET inserts room after the network header
by pulling the skb, moving the network header forward and zeroing the
new space.

Add new mode BPF_ADJUST_ROOM_MAC that inserts room after the mac
header. This allows inserting tunnel headers in front of the network
header without having to recreate the network header in the original
space, avoiding two copies.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Willem de Bruijn 2019-03-22 14:32:54 -04:00 • committed by Alexei Starovoitov

parent 8142958954

commit 14aa31929b

2 changed files with 25 additions and 19 deletions

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6

include/uapi/linux/bpf.h

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38

net/core/filter.c

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