Commits
Willem de Bruijn committed 14aa31929b7
bpf: add bpf_skb_adjust_room mode BPF_ADJ_ROOM_MAC 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>