BPF_F_HDR_FIELD_MASK 2886 include/uapi/linux/bpf.h #define BPF_F_HDR_FIELD_MASK 0xfULL BPF_F_HDR_FIELD_MASK 2886 tools/include/uapi/linux/bpf.h #define BPF_F_HDR_FIELD_MASK 0xfULL