NONCE_LEN
__u8 nonce[NONCE_LEN];
if (olen < 2 * KEY_LEN + NONCE_LEN) {
olen, 2 * KEY_LEN + NONCE_LEN);
memcpy(ctx->nonce, bkey + 2 * KEY_LEN, NONCE_LEN);
NLA_PUT(ctx->nl_msg, OVPN_A_KEYDIR_NONCE_TAIL, NONCE_LEN, ovpn->nonce);
NLA_PUT(ctx->nl_msg, OVPN_A_KEYDIR_NONCE_TAIL, NONCE_LEN, ovpn->nonce);