ihl              1634 src/dps8/fnpuv.c     uint ihl             =         (buffer [ip +  0]) & 0xf;
ihl              1635 src/dps8/fnpuv.c     uint payload_offset  =                  ip + ihl * 4;
ihl              1636 src/dps8/fnpuv.c     if (version != 4 || ihl < 5 || payload_offset > (size_t)nread)