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 #include <asm/unaligned.h>
9
10 void eir_create(struct hci_dev *hdev, u8 *data);
11
12 u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);
13 u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr);
14 u8 eir_create_per_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);
15
16 u8 eir_append_local_name(struct hci_dev *hdev, u8 *eir, u8 ad_len);
17 u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len);
18 u8 eir_append_service_data(u8 *eir, u16 eir_len, u16 uuid, u8 *data,
19 u8 data_len);
20
21 static inline u16 eir_precalc_len(u8 data_len)
22 {
23 return sizeof(u8) * 2 + data_len;
24 }
25
26 static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type,
27 u8 *data, u8 data_len)
28 {
29 eir[eir_len++] = sizeof(type) + data_len;
30 eir[eir_len++] = type;
31 memcpy(&eir[eir_len], data, data_len);
32 eir_len += data_len;
33
34 return eir_len;
35 }
36
37 static inline u16 eir_append_le16(u8 *eir, u16 eir_len, u8 type, u16 data)
38 {
39 eir[eir_len++] = sizeof(type) + sizeof(data);
40 eir[eir_len++] = type;
41 put_unaligned_le16(data, &eir[eir_len]);
42 eir_len += sizeof(data);
43
44 return eir_len;
45 }
46
47 static inline u16 eir_skb_put_data(struct sk_buff *skb, u8 type, u8 *data, u8 data_len)
48 {
49 u8 *eir;
50 u16 eir_len;
51
52 eir_len = eir_precalc_len(data_len);
53 eir = skb_put(skb, eir_len);
54 WARN_ON(sizeof(type) + data_len > U8_MAX);
55 eir[0] = sizeof(type) + data_len;
56 eir[1] = type;
57 memcpy(&eir[2], data, data_len);
58
59 return eir_len;
60 }
61
62 static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type,
63 size_t *data_len)
64 {
65 size_t parsed = 0;
66
67 if (eir_len < 2)
68 return NULL;
69
70 while (parsed < eir_len - 1) {
71 u8 field_len = eir[0];
72
73 if (field_len == 0)
74 break;
75
76 parsed += field_len + 1;
77
78 if (parsed > eir_len)
79 break;
80
81 if (eir[1] != type) {
82 eir += field_len + 1;
83 continue;
84 }
85
86 /* Zero length data */
87 if (field_len == 1)
88 return NULL;
89
90 if (data_len)
91 *data_len = field_len - 1;
92
93 return &eir[2];
94 }
95
96 return NULL;
97 }
98
99 void *eir_get_service_data(u8 *eir, size_t eir_len, u16 uuid, size_t *len);
100
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