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