BPF_ADJ_ROOM_MAC
case BPF_ADJ_ROOM_MAC:
if (bpf_skb_adjust_room(skb, -encap_overhead, BPF_ADJ_ROOM_MAC,
if (bpf_skb_adjust_room(skb, -encap_overhead, BPF_ADJ_ROOM_MAC,
if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
if (bpf_skb_adjust_room(skb, olen, BPF_ADJ_ROOM_MAC, flags))
if (bpf_skb_adjust_room(skb, -olen, BPF_ADJ_ROOM_MAC, flags))
err = bpf_skb_adjust_room(ctx, 1, BPF_ADJ_ROOM_MAC, 0);
err = bpf_skb_adjust_room(ctx, -1, BPF_ADJ_ROOM_MAC, 0);
err = bpf_skb_adjust_room(ctx, 256, BPF_ADJ_ROOM_MAC, 0);