forked from Minki/linux
c2b2a1a77f
This patch introduce eir_skb_put_data() that can be used to simplify operations on eir in goal of eliminating the necessity of intermediary buffers. eir_skb_put_data() is in pair to what eir_append_data() does with help of eir_len, but without awkwardness when passing return value to skb_put() (as it returns updated offset not size). Signed-off-by: Radoslaw Biernacki <rad@semihalf.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* BlueZ - Bluetooth protocol stack for Linux
|
|
*
|
|
* Copyright (C) 2021 Intel Corporation
|
|
*/
|
|
|
|
#include <asm/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_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);
|
|
|
|
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;
|
|
}
|