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/* SPDX-License-Identifier: GPL-2.0 */
/*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2021 Intel Corporation
*/
#include <linux/unaligned.h>
void eir_create(struct hci_dev *hdev, u8 *data);
u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);
u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr);
u8 eir_create_per_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);
u8 eir_append_local_name(struct hci_dev *hdev, u8 *eir, u8 ad_len);
u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len);
u8 eir_append_service_data(u8 *eir, u16 eir_len, u16 uuid, u8 *data,
u8 data_len);
static inline u16 eir_precalc_len(u8 data_len)
{
return sizeof(u8) * 2 + data_len;
}
static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type,
u8 *data, u8 data_len)
{
eir[eir_len++] = sizeof(type) + data_len;
eir[eir_len++] = type;
memcpy(&eir[eir_len], data, data_len);
eir_len += data_len;
return eir_len;
}
static inline u16 eir_append_le16(u8 *eir, u16 eir_len, u8 type, u16 data)
{
eir[eir_len++] = sizeof(type) + sizeof(data);
eir[eir_len++] = type;
put_unaligned_le16(data, &eir[eir_len]);
eir_len += sizeof(data);
return eir_len;
}
static inline u16 eir_skb_put_data(struct sk_buff *skb, u8 type, u8 *data, u8 data_len)
{
u8 *eir;
u16 eir_len;
eir_len = eir_precalc_len(data_len);
eir = skb_put(skb, eir_len);
WARN_ON(sizeof(type) + data_len > U8_MAX);
eir[0] = sizeof(type) + data_len;
eir[1] = type;
memcpy(&eir[2], data, data_len);
return eir_len;
}
static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type,
size_t *data_len)
{
size_t parsed = 0;
if (eir_len < 2)
return NULL;
while (parsed < eir_len - 1) {
u8 field_len = eir[0];
if (field_len == 0)
break;
parsed += field_len + 1;
if (parsed > eir_len)
break;
if (eir[1] != type) {
eir += field_len + 1;
continue;
}
/* Zero length data */
if (field_len == 1)
return NULL;
if (data_len)
*data_len = field_len - 1;
return &eir[2];
}
return NULL;
}
void *eir_get_service_data(u8 *eir, size_t eir_len, u16 uuid, size_t *len);
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