LWT_BPF_MAX_HEADROOM 425 net/core/lwt_bpf.c if (headroom > LWT_BPF_MAX_HEADROOM) { LWT_BPF_MAX_HEADROOM 598 net/core/lwt_bpf.c if (unlikely(len < sizeof(struct iphdr) || len > LWT_BPF_MAX_HEADROOM))