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335 lines
7.3 KiB
335 lines
7.3 KiB
// 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 <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#include <net/bluetooth/mgmt.h> |
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#include "eir.h" |
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#define PNP_INFO_SVCLASS_ID 0x1200 |
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u8 eir_append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len) |
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{ |
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size_t short_len; |
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size_t complete_len; |
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/* no space left for name (+ NULL + type + len) */ |
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if ((HCI_MAX_AD_LENGTH - ad_len) < HCI_MAX_SHORT_NAME_LENGTH + 3) |
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return ad_len; |
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/* use complete name if present and fits */ |
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complete_len = strlen(hdev->dev_name); |
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if (complete_len && complete_len <= HCI_MAX_SHORT_NAME_LENGTH) |
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return eir_append_data(ptr, ad_len, EIR_NAME_COMPLETE, |
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hdev->dev_name, complete_len + 1); |
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/* use short name if present */ |
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short_len = strlen(hdev->short_name); |
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if (short_len) |
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return eir_append_data(ptr, ad_len, EIR_NAME_SHORT, |
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hdev->short_name, short_len + 1); |
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/* use shortened full name if present, we already know that name |
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* is longer then HCI_MAX_SHORT_NAME_LENGTH |
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*/ |
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if (complete_len) { |
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u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1]; |
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memcpy(name, hdev->dev_name, HCI_MAX_SHORT_NAME_LENGTH); |
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name[HCI_MAX_SHORT_NAME_LENGTH] = '\0'; |
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return eir_append_data(ptr, ad_len, EIR_NAME_SHORT, name, |
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sizeof(name)); |
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} |
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return ad_len; |
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} |
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u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len) |
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{ |
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return eir_append_le16(ptr, ad_len, EIR_APPEARANCE, hdev->appearance); |
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} |
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static u8 *create_uuid16_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len) |
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{ |
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u8 *ptr = data, *uuids_start = NULL; |
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struct bt_uuid *uuid; |
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if (len < 4) |
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return ptr; |
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list_for_each_entry(uuid, &hdev->uuids, list) { |
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u16 uuid16; |
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if (uuid->size != 16) |
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continue; |
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uuid16 = get_unaligned_le16(&uuid->uuid[12]); |
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if (uuid16 < 0x1100) |
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continue; |
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if (uuid16 == PNP_INFO_SVCLASS_ID) |
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continue; |
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if (!uuids_start) { |
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uuids_start = ptr; |
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uuids_start[0] = 1; |
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uuids_start[1] = EIR_UUID16_ALL; |
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ptr += 2; |
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} |
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/* Stop if not enough space to put next UUID */ |
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if ((ptr - data) + sizeof(u16) > len) { |
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uuids_start[1] = EIR_UUID16_SOME; |
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break; |
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} |
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*ptr++ = (uuid16 & 0x00ff); |
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*ptr++ = (uuid16 & 0xff00) >> 8; |
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uuids_start[0] += sizeof(uuid16); |
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} |
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return ptr; |
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} |
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static u8 *create_uuid32_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len) |
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{ |
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u8 *ptr = data, *uuids_start = NULL; |
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struct bt_uuid *uuid; |
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if (len < 6) |
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return ptr; |
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list_for_each_entry(uuid, &hdev->uuids, list) { |
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if (uuid->size != 32) |
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continue; |
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if (!uuids_start) { |
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uuids_start = ptr; |
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uuids_start[0] = 1; |
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uuids_start[1] = EIR_UUID32_ALL; |
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ptr += 2; |
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} |
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/* Stop if not enough space to put next UUID */ |
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if ((ptr - data) + sizeof(u32) > len) { |
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uuids_start[1] = EIR_UUID32_SOME; |
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break; |
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} |
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memcpy(ptr, &uuid->uuid[12], sizeof(u32)); |
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ptr += sizeof(u32); |
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uuids_start[0] += sizeof(u32); |
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} |
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return ptr; |
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} |
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static u8 *create_uuid128_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len) |
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{ |
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u8 *ptr = data, *uuids_start = NULL; |
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struct bt_uuid *uuid; |
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if (len < 18) |
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return ptr; |
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list_for_each_entry(uuid, &hdev->uuids, list) { |
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if (uuid->size != 128) |
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continue; |
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if (!uuids_start) { |
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uuids_start = ptr; |
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uuids_start[0] = 1; |
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uuids_start[1] = EIR_UUID128_ALL; |
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ptr += 2; |
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} |
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/* Stop if not enough space to put next UUID */ |
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if ((ptr - data) + 16 > len) { |
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uuids_start[1] = EIR_UUID128_SOME; |
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break; |
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} |
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memcpy(ptr, uuid->uuid, 16); |
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ptr += 16; |
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uuids_start[0] += 16; |
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} |
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return ptr; |
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} |
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void eir_create(struct hci_dev *hdev, u8 *data) |
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{ |
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u8 *ptr = data; |
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size_t name_len; |
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name_len = strlen(hdev->dev_name); |
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if (name_len > 0) { |
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/* EIR Data type */ |
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if (name_len > 48) { |
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name_len = 48; |
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ptr[1] = EIR_NAME_SHORT; |
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} else { |
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ptr[1] = EIR_NAME_COMPLETE; |
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} |
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/* EIR Data length */ |
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ptr[0] = name_len + 1; |
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memcpy(ptr + 2, hdev->dev_name, name_len); |
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ptr += (name_len + 2); |
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} |
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if (hdev->inq_tx_power != HCI_TX_POWER_INVALID) { |
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ptr[0] = 2; |
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ptr[1] = EIR_TX_POWER; |
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ptr[2] = (u8)hdev->inq_tx_power; |
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ptr += 3; |
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} |
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if (hdev->devid_source > 0) { |
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ptr[0] = 9; |
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ptr[1] = EIR_DEVICE_ID; |
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put_unaligned_le16(hdev->devid_source, ptr + 2); |
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put_unaligned_le16(hdev->devid_vendor, ptr + 4); |
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put_unaligned_le16(hdev->devid_product, ptr + 6); |
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put_unaligned_le16(hdev->devid_version, ptr + 8); |
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ptr += 10; |
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} |
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ptr = create_uuid16_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data)); |
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ptr = create_uuid32_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data)); |
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ptr = create_uuid128_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data)); |
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} |
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u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr) |
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{ |
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struct adv_info *adv = NULL; |
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u8 ad_len = 0, flags = 0; |
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u32 instance_flags; |
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/* Return 0 when the current instance identifier is invalid. */ |
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if (instance) { |
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adv = hci_find_adv_instance(hdev, instance); |
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if (!adv) |
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return 0; |
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} |
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instance_flags = hci_adv_instance_flags(hdev, instance); |
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/* If instance already has the flags set skip adding it once |
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* again. |
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*/ |
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if (adv && eir_get_data(adv->adv_data, adv->adv_data_len, EIR_FLAGS, |
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NULL)) |
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goto skip_flags; |
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/* The Add Advertising command allows userspace to set both the general |
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* and limited discoverable flags. |
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*/ |
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if (instance_flags & MGMT_ADV_FLAG_DISCOV) |
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flags |= LE_AD_GENERAL; |
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if (instance_flags & MGMT_ADV_FLAG_LIMITED_DISCOV) |
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flags |= LE_AD_LIMITED; |
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if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) |
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flags |= LE_AD_NO_BREDR; |
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if (flags || (instance_flags & MGMT_ADV_FLAG_MANAGED_FLAGS)) { |
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/* If a discovery flag wasn't provided, simply use the global |
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* settings. |
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*/ |
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if (!flags) |
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flags |= mgmt_get_adv_discov_flags(hdev); |
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/* If flags would still be empty, then there is no need to |
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* include the "Flags" AD field". |
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*/ |
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if (flags) { |
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ptr[0] = 0x02; |
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ptr[1] = EIR_FLAGS; |
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ptr[2] = flags; |
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ad_len += 3; |
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ptr += 3; |
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} |
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} |
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skip_flags: |
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if (adv) { |
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memcpy(ptr, adv->adv_data, adv->adv_data_len); |
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ad_len += adv->adv_data_len; |
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ptr += adv->adv_data_len; |
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} |
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if (instance_flags & MGMT_ADV_FLAG_TX_POWER) { |
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s8 adv_tx_power; |
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if (ext_adv_capable(hdev)) { |
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if (adv) |
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adv_tx_power = adv->tx_power; |
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else |
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adv_tx_power = hdev->adv_tx_power; |
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} else { |
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adv_tx_power = hdev->adv_tx_power; |
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} |
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/* Provide Tx Power only if we can provide a valid value for it */ |
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if (adv_tx_power != HCI_TX_POWER_INVALID) { |
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ptr[0] = 0x02; |
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ptr[1] = EIR_TX_POWER; |
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ptr[2] = (u8)adv_tx_power; |
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ad_len += 3; |
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ptr += 3; |
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} |
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} |
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return ad_len; |
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} |
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static u8 create_default_scan_rsp(struct hci_dev *hdev, u8 *ptr) |
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{ |
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u8 scan_rsp_len = 0; |
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if (hdev->appearance) |
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scan_rsp_len = eir_append_appearance(hdev, ptr, scan_rsp_len); |
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return eir_append_local_name(hdev, ptr, scan_rsp_len); |
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} |
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u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr) |
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{ |
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struct adv_info *adv; |
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u8 scan_rsp_len = 0; |
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if (!instance) |
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return create_default_scan_rsp(hdev, ptr); |
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adv = hci_find_adv_instance(hdev, instance); |
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if (!adv) |
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return 0; |
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if ((adv->flags & MGMT_ADV_FLAG_APPEARANCE) && hdev->appearance) |
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scan_rsp_len = eir_append_appearance(hdev, ptr, scan_rsp_len); |
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memcpy(&ptr[scan_rsp_len], adv->scan_rsp_data, adv->scan_rsp_len); |
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scan_rsp_len += adv->scan_rsp_len; |
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if (adv->flags & MGMT_ADV_FLAG_LOCAL_NAME) |
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scan_rsp_len = eir_append_local_name(hdev, ptr, scan_rsp_len); |
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return scan_rsp_len; |
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}
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