bpf_append_bytes
bpf_append_bytes, &bt);
bpf_append_bytes(d, d->bd_sbuf, d->bd_slen, zeroes,
bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr32_old,
bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr_old,
bpf_append_bytes(d, d->bd_sbuf, curlen, &hdr, sizeof(hdr));