hci_scodata_hdr_t
#define HCI_SCO_PKT_SIZE (sizeof(hci_scodata_hdr_t) + 0xff)
hci_scodata_hdr_t hdr;
hci_scodata_hdr_t *hdr;
M_PREPEND(m, sizeof(hci_scodata_hdr_t), M_NOWAIT);
hdr = mtod(m, hci_scodata_hdr_t *);