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