BIOCSFILDROP
if (ioctl(bpffd, BIOCSFILDROP, &fildrop) == -1)
case BIOCSFILDROP: { /* set "filter-drop" flag */
if (ioctl(info->rfdesc, BIOCSFILDROP, &fildrop) == -1)
if (ioctl(info->rfdesc, BIOCSFILDROP, &flag) == -1)
if (ioctl(fd, BIOCSFILDROP, &fildrop) == -1)