1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * BlueZ - Bluetooth protocol stack for Linux
4 *
5 * Copyright (C) 2021 Intel Corporation
6 */
7
8 void eir_create(struct hci_dev *hdev, u8 *data);
9
10 u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);
11 u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr);
12
13 u8 eir_append_local_name(struct hci_dev *hdev, u8 *eir, u8 ad_len);
14 u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len);
15
eir_append_data(u8 * eir,u16 eir_len,u8 type,u8 * data,u8 data_len)16 static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type,
17 u8 *data, u8 data_len)
18 {
19 eir[eir_len++] = sizeof(type) + data_len;
20 eir[eir_len++] = type;
21 memcpy(&eir[eir_len], data, data_len);
22 eir_len += data_len;
23
24 return eir_len;
25 }
26
eir_append_le16(u8 * eir,u16 eir_len,u8 type,u16 data)27 static inline u16 eir_append_le16(u8 *eir, u16 eir_len, u8 type, u16 data)
28 {
29 eir[eir_len++] = sizeof(type) + sizeof(data);
30 eir[eir_len++] = type;
31 put_unaligned_le16(data, &eir[eir_len]);
32 eir_len += sizeof(data);
33
34 return eir_len;
35 }
36
eir_get_data(u8 * eir,size_t eir_len,u8 type,size_t * data_len)37 static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type,
38 size_t *data_len)
39 {
40 size_t parsed = 0;
41
42 if (eir_len < 2)
43 return NULL;
44
45 while (parsed < eir_len - 1) {
46 u8 field_len = eir[0];
47
48 if (field_len == 0)
49 break;
50
51 parsed += field_len + 1;
52
53 if (parsed > eir_len)
54 break;
55
56 if (eir[1] != type) {
57 eir += field_len + 1;
58 continue;
59 }
60
61 /* Zero length data */
62 if (field_len == 1)
63 return NULL;
64
65 if (data_len)
66 *data_len = field_len - 1;
67
68 return &eir[2];
69 }
70
71 return NULL;
72 }
73