BPF_LOAD_HDR_OPT_TCP_SYN
bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN;
if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN)
__u64 load_flags = check_syn ? BPF_LOAD_HDR_OPT_TCP_SYN : 0;
int ret, load_flags = from_syn ? BPF_LOAD_HDR_OPT_TCP_SYN : 0;