MACSEC_TCI_SC
sectag.tci_an |= MACSEC_TCI_SC;
if (hdr->tci_an & MACSEC_TCI_SC) {
macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
} else if ((!(hdr->tci_an & (MACSEC_TCI_ES | MACSEC_TCI_SC))) &&
h->tci_an |= MACSEC_TCI_SC;
int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
(h->tci_an & MACSEC_TCI_SC))