- version = EXTRACT_U_1(bp) >> 4;
- next_hdr = EXTRACT_U_1(bp) & 0x0f;
- hdr_type = EXTRACT_U_1(bp + 1) >> 4;
- hdr_subtype = EXTRACT_U_1(bp + 1) & 0x0f;
- payload_length = EXTRACT_BE_U_2(bp + 4);
- hop_limit = EXTRACT_U_1(bp + 7);
+ version = GET_U_1(bp) >> 4;
+ next_hdr = GET_U_1(bp) & 0x0f;
+ hdr_type = GET_U_1(bp + 1) >> 4;
+ hdr_subtype = GET_U_1(bp + 1) & 0x0f;
+ payload_length = GET_BE_U_2(bp + 4);
+ hop_limit = GET_U_1(bp + 7);