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db08722fc7
There a few instances still using HCI_MAX_AD_LENGTH instead of using
max_adv_len which takes care of detecting what is the actual maximum
length depending on if the controller supports EA or not.
Fixes: 112b5090c2
("Bluetooth: MGMT: Fix always using HCI_MAX_AD_LENGTH")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
399 lines
8.8 KiB
C
399 lines
8.8 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 <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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static u8 eir_append_name(u8 *eir, u16 eir_len, u8 type, u8 *data, u8 data_len)
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{
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u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1];
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/* If data is already NULL terminated just pass it directly */
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if (data[data_len - 1] == '\0')
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return eir_append_data(eir, eir_len, type, data, data_len);
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memcpy(name, data, HCI_MAX_SHORT_NAME_LENGTH);
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name[HCI_MAX_SHORT_NAME_LENGTH] = '\0';
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return eir_append_data(eir, eir_len, type, name, sizeof(name));
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}
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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 ((max_adv_len(hdev) - 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 = strnlen(hdev->dev_name, sizeof(hdev->dev_name));
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if (complete_len && complete_len <= HCI_MAX_SHORT_NAME_LENGTH)
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return eir_append_name(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 = strnlen(hdev->short_name, sizeof(hdev->short_name));
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if (short_len)
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return eir_append_name(ptr, ad_len, EIR_NAME_SHORT,
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hdev->short_name,
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short_len == HCI_MAX_SHORT_NAME_LENGTH ?
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short_len : 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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return eir_append_name(ptr, ad_len, EIR_NAME_SHORT,
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hdev->dev_name,
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HCI_MAX_SHORT_NAME_LENGTH);
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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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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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{
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eir[eir_len++] = sizeof(u8) + sizeof(uuid) + data_len;
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eir[eir_len++] = EIR_SERVICE_DATA;
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put_unaligned_le16(uuid, &eir[eir_len]);
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eir_len += sizeof(uuid);
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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 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 = strnlen(hdev->dev_name, sizeof(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_per_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;
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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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if (adv) {
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memcpy(ptr, adv->per_adv_data, adv->per_adv_data_len);
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ad_len += adv->per_adv_data_len;
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ptr += adv->per_adv_data_len;
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}
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return ad_len;
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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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void *eir_get_service_data(u8 *eir, size_t eir_len, u16 uuid, size_t *len)
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{
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while ((eir = eir_get_data(eir, eir_len, EIR_SERVICE_DATA, len))) {
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u16 value = get_unaligned_le16(eir);
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if (uuid == value) {
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if (len)
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*len -= 2;
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return &eir[2];
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}
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eir += *len;
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eir_len -= *len;
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}
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return NULL;
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}
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