xref: /aosp_15_r20/packages/modules/Bluetooth/system/stack/gatt/gatt_utils.cc

/******************************************************************************
 *
 *  Copyright 2009-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  this file contains GATT utility functions
 *
 ******************************************************************************/
#define LOG_TAG "gatt_utils"

#include <base/strings/stringprintf.h>
#include <bluetooth/log.h>
#include <com_android_bluetooth_flags.h>

#include <cstdint>
#include <deque>

#include "hardware/bt_gatt_types.h"
#include "internal_include/bt_target.h"
#include "main/shim/acl_api.h"
#include "main/shim/dumpsys.h"
#include "osi/include/allocator.h"
#include "osi/include/properties.h"
#include "stack/btm/btm_dev.h"
#include "stack/btm/btm_sec.h"
#include "stack/connection_manager/connection_manager.h"
#include "stack/eatt/eatt.h"
#include "stack/gatt/gatt_int.h"
#include "stack/include/bt_hdr.h"
#include "stack/include/bt_psm_types.h"
#include "stack/include/bt_types.h"
#include "stack/include/bt_uuid16.h"
#include "stack/include/btm_sec_api.h"
#include "stack/include/l2cdefs.h"
#include "stack/include/sdp_api.h"
#include "types/bluetooth/uuid.h"
#include "types/raw_address.h"

using namespace bluetooth::legacy::stack::sdp;
using namespace bluetooth;

using bluetooth::Uuid;
using bluetooth::eatt::EattChannel;
using bluetooth::eatt::EattExtension;

/* check if [x, y] and [a, b] have overlapping range */
#define GATT_VALIDATE_HANDLE_RANGE(x, y, a, b) ((y) >= (a) && (x) <= (b))

#define GATT_GET_NEXT_VALID_HANDLE(x) (((x) / 10 + 1) * 10)

const char* const op_code_name[] = {"UNKNOWN",
                                    "ATT_RSP_ERROR",
                                    "ATT_REQ_MTU",
                                    "ATT_RSP_MTU",
                                    "ATT_REQ_READ_INFO",
                                    "ATT_RSP_READ_INFO",
                                    "ATT_REQ_FIND_TYPE_VALUE",
                                    "ATT_RSP_FIND_TYPE_VALUE",
                                    "ATT_REQ_READ_BY_TYPE",
                                    "ATT_RSP_READ_BY_TYPE",
                                    "ATT_REQ_READ",
                                    "ATT_RSP_READ",
                                    "ATT_REQ_READ_BLOB",
                                    "ATT_RSP_READ_BLOB",
                                    "GATT_REQ_READ_MULTI",
                                    "GATT_RSP_READ_MULTI",
                                    "GATT_REQ_READ_BY_GRP_TYPE",
                                    "GATT_RSP_READ_BY_GRP_TYPE",
                                    "ATT_REQ_WRITE",
                                    "ATT_RSP_WRITE",
                                    "ATT_CMD_WRITE",
                                    "ATT_SIGN_CMD_WRITE",
                                    "ATT_REQ_PREPARE_WRITE",
                                    "ATT_RSP_PREPARE_WRITE",
                                    "ATT_REQ_EXEC_WRITE",
                                    "ATT_RSP_EXEC_WRITE",
                                    "Reserved",
                                    "ATT_HANDLE_VALUE_NOTIF",
                                    "Reserved",
                                    "ATT_HANDLE_VALUE_IND",
                                    "ATT_HANDLE_VALUE_CONF",
                                    "ATT_OP_CODE_MAX"};

uint16_t gatt_get_local_mtu(void) {
  /* Default ATT MTU must not be greater than GATT_MAX_MTU_SIZE, nor smaller
   * than GATT_DEF_BLE_MTU_SIZE */
  static const uint16_t ATT_MTU_DEFAULT =
          std::max(std::min(517, GATT_MAX_MTU_SIZE), GATT_DEF_BLE_MTU_SIZE);
  return ATT_MTU_DEFAULT;
}

static uint16_t gatt_get_max_phy_channel() {
  static const uint16_t MAX_PHY_CHANNEL =
          std::min(std::max(osi_property_get_int32(
                                    "bluetooth.core.le.max_number_of_concurrent_connections", 0),
                            GATT_MAX_PHY_CHANNEL_FLOOR),
                   GATT_MAX_PHY_CHANNEL);
  return MAX_PHY_CHANNEL;
}

/*******************************************************************************
 *
 * Function         gatt_free_pending_ind
 *
 * Description    Free all pending indications
 *
 * Returns       None
 *
 ******************************************************************************/
static void gatt_free_pending_ind(tGATT_TCB* p_tcb) {
  log::verbose("");

  if (p_tcb->pending_ind_q == NULL) {
    return;
  }

  /* release all queued indications */
  while (!fixed_queue_is_empty(p_tcb->pending_ind_q)) {
    osi_free(fixed_queue_try_dequeue(p_tcb->pending_ind_q));
  }
  fixed_queue_free(p_tcb->pending_ind_q, NULL);
  p_tcb->pending_ind_q = NULL;
}

/*******************************************************************************
 *
 * Function         gatt_delete_dev_from_srv_chg_clt_list
 *
 * Description    Delete a device from the service changed client lit
 *
 * Returns       None
 *
 ******************************************************************************/
void gatt_delete_dev_from_srv_chg_clt_list(const RawAddress& bd_addr) {
  log::verbose("");

  tGATTS_SRV_CHG* p_buf = gatt_is_bda_in_the_srv_chg_clt_list(bd_addr);
  if (p_buf != NULL) {
    if (gatt_cb.cb_info.p_srv_chg_callback) {
      /* delete from NV */
      tGATTS_SRV_CHG_REQ req;
      req.srv_chg.bda = bd_addr;
      (*gatt_cb.cb_info.p_srv_chg_callback)(GATTS_SRV_CHG_CMD_REMOVE_CLIENT, &req, NULL);
    }
    osi_free(fixed_queue_try_remove_from_queue(gatt_cb.srv_chg_clt_q, p_buf));
  }
}

/*******************************************************************************
 *
 * Function         gatt_set_srv_chg
 *
 * Description      Set the service changed flag to true
 *
 * Returns        None
 *
 ******************************************************************************/
void gatt_set_srv_chg(void) {
  log::verbose("");

  if (fixed_queue_is_empty(gatt_cb.srv_chg_clt_q)) {
    return;
  }

  list_t* list = fixed_queue_get_list(gatt_cb.srv_chg_clt_q);
  for (const list_node_t* node = list_begin(list); node != list_end(list); node = list_next(node)) {
    log::verbose("found a srv_chg clt");

    tGATTS_SRV_CHG* p_buf = (tGATTS_SRV_CHG*)list_node(node);
    if (!p_buf->srv_changed) {
      log::verbose("set srv_changed to true");
      p_buf->srv_changed = true;
      tGATTS_SRV_CHG_REQ req;
      memcpy(&req.srv_chg, p_buf, sizeof(tGATTS_SRV_CHG));
      if (gatt_cb.cb_info.p_srv_chg_callback) {
        (*gatt_cb.cb_info.p_srv_chg_callback)(GATTS_SRV_CHG_CMD_UPDATE_CLIENT, &req, NULL);
      }
    }
  }
}

/** Add a pending indication */
void gatt_add_pending_ind(tGATT_TCB* p_tcb, tGATT_VALUE* p_ind) {
  log::verbose("enqueue a pending indication");

  tGATT_VALUE* p_buf = (tGATT_VALUE*)osi_malloc(sizeof(tGATT_VALUE));
  memcpy(p_buf, p_ind, sizeof(tGATT_VALUE));
  fixed_queue_enqueue(p_tcb->pending_ind_q, p_buf);
}

/*******************************************************************************
 *
 * Function     gatt_add_srv_chg_clt
 *
 * Description  Add a service chnage client to the service change client queue
 *
 * Returns    Pointer to the service change client buffer; Null no buffer
 *            available
 *
 ******************************************************************************/
tGATTS_SRV_CHG* gatt_add_srv_chg_clt(tGATTS_SRV_CHG* p_srv_chg) {
  tGATTS_SRV_CHG* p_buf = (tGATTS_SRV_CHG*)osi_malloc(sizeof(tGATTS_SRV_CHG));
  log::verbose("enqueue a srv chg client");

  memcpy(p_buf, p_srv_chg, sizeof(tGATTS_SRV_CHG));
  fixed_queue_enqueue(gatt_cb.srv_chg_clt_q, p_buf);

  return p_buf;
}

/**
 * Returns pointer to the handle range buffer starting at handle |handle|,
 * nullptr
 * if no buffer available
 */
tGATT_HDL_LIST_ELEM* gatt_find_hdl_buffer_by_handle(uint16_t handle) {
  for (auto& elem : *gatt_cb.hdl_list_info) {
    if (elem.asgn_range.s_handle == handle) {
      return &elem;
    }
  }

  return nullptr;
}
/*******************************************************************************
 *
 * Description  Find handle range buffer by app ID, service and service instance
 *              ID.
 *
 * Returns    Pointer to the buffer, NULL no buffer available
 *
 ******************************************************************************/
std::list<tGATT_HDL_LIST_ELEM>::iterator gatt_find_hdl_buffer_by_app_id(const Uuid& app_uuid128,
                                                                        Uuid* p_svc_uuid,
                                                                        uint16_t start_handle) {
  auto end_it = gatt_cb.hdl_list_info->end();
  auto it = gatt_cb.hdl_list_info->begin();
  for (; it != end_it; it++) {
    if (app_uuid128 == it->asgn_range.app_uuid128 && *p_svc_uuid == it->asgn_range.svc_uuid &&
        (start_handle == it->asgn_range.s_handle)) {
      return it;
    }
  }

  return it;
}

/**
 * free the service attribute database buffers by the owner of the service app
 * ID.
 */
void gatt_free_srvc_db_buffer_app_id(const Uuid& app_id) {
  auto it = gatt_cb.hdl_list_info->begin();
  auto end = gatt_cb.hdl_list_info->end();
  while (it != end) {
    if (app_id == it->asgn_range.app_uuid128) {
      it = gatt_cb.hdl_list_info->erase(it);
    } else {
      it++;
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_find_the_connected_bda
 *
 * Description      This function find the connected bda
 *
 * Returns           true if found
 *
 ******************************************************************************/
bool gatt_find_the_connected_bda(uint8_t start_idx, RawAddress& bda, uint8_t* p_found_idx,
                                 tBT_TRANSPORT* p_transport) {
  uint8_t i;
  bool found = false;
  log::debug("start_idx={}", start_idx);

  for (i = start_idx; i < gatt_get_max_phy_channel(); i++) {
    if (gatt_cb.tcb[i].in_use && gatt_cb.tcb[i].ch_state == GATT_CH_OPEN) {
      bda = gatt_cb.tcb[i].peer_bda;
      *p_found_idx = i;
      *p_transport = gatt_cb.tcb[i].transport;
      found = true;
      log::debug("bda: {}", bda);
      break;
    }
  }
  log::debug("found={} found_idx={}", found, i);
  return found;
}

/*******************************************************************************
 *
 * Function         gatt_is_srv_chg_ind_pending
 *
 * Description      Check whether a service chnaged is in the indication pending
 *                  queue or waiting for an Ack already
 *
 * Returns         bool
 *
 ******************************************************************************/
bool gatt_is_srv_chg_ind_pending(tGATT_TCB* p_tcb) {
  log::verbose("is_queue_empty={}", fixed_queue_is_empty(p_tcb->pending_ind_q));

  if (p_tcb->indicate_handle == gatt_cb.handle_of_h_r) {
    return true;
  }

  if (p_tcb->eatt &&
      EattExtension::GetInstance()->IsIndicationPending(p_tcb->peer_bda, gatt_cb.handle_of_h_r)) {
    return true;
  }

  if (fixed_queue_is_empty(p_tcb->pending_ind_q)) {
    return false;
  }

  list_t* list = fixed_queue_get_list(p_tcb->pending_ind_q);
  for (const list_node_t* node = list_begin(list); node != list_end(list); node = list_next(node)) {
    tGATT_VALUE* p_buf = (tGATT_VALUE*)list_node(node);
    if (p_buf->handle == gatt_cb.handle_of_h_r) {
      return true;
    }
  }

  return false;
}

/*******************************************************************************
 *
 * Function         gatt_is_bda_in_the_srv_chg_clt_list
 *
 * Description      This function check the specified bda is in the srv chg
 *                  client list or not
 *
 * Returns         pointer to the found elemenet otherwise NULL
 *
 ******************************************************************************/
tGATTS_SRV_CHG* gatt_is_bda_in_the_srv_chg_clt_list(const RawAddress& bda) {
  log::verbose("{}", bda);

  if (fixed_queue_is_empty(gatt_cb.srv_chg_clt_q)) {
    return NULL;
  }

  list_t* list = fixed_queue_get_list(gatt_cb.srv_chg_clt_q);
  for (const list_node_t* node = list_begin(list); node != list_end(list); node = list_next(node)) {
    tGATTS_SRV_CHG* p_buf = (tGATTS_SRV_CHG*)list_node(node);
    if (bda == p_buf->bda) {
      log::verbose("bda is in the srv chg clt list");
      return p_buf;
    }
  }

  return NULL;
}

/*******************************************************************************
 *
 * Function         gatt_find_i_tcb_by_addr
 *
 * Description      Search for an empty tcb entry, and return the index.
 *
 * Returns          GATT_INDEX_INVALID if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
static uint8_t gatt_find_i_tcb_by_addr(const RawAddress& bda, tBT_TRANSPORT transport) {
  uint8_t i = 0;

  for (; i < gatt_get_max_phy_channel(); i++) {
    if (gatt_cb.tcb[i].peer_bda == bda && gatt_cb.tcb[i].transport == transport) {
      return i;
    }
  }
  return GATT_INDEX_INVALID;
}

/*******************************************************************************
 *
 * Function         gatt_get_tcb_by_idx
 *
 * Description      The function get TCB using the TCB index
 *
 * Returns           NULL if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_get_tcb_by_idx(tTCB_IDX tcb_idx) {
  tGATT_TCB* p_tcb = NULL;

  if ((tcb_idx < gatt_get_max_phy_channel()) && gatt_cb.tcb[tcb_idx].in_use) {
    p_tcb = &gatt_cb.tcb[tcb_idx];
  }

  return p_tcb;
}

/*******************************************************************************
 *
 * Function         gatt_find_tcb_by_addr
 *
 * Description      Search for an empty tcb entry, and return pointer.
 *
 * Returns          NULL if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_find_tcb_by_addr(const RawAddress& bda, tBT_TRANSPORT transport) {
  tGATT_TCB* p_tcb = nullptr;
  uint8_t i = 0;

  i = gatt_find_i_tcb_by_addr(bda, transport);
  if (i != GATT_INDEX_INVALID) {
    p_tcb = &gatt_cb.tcb[i];
  }

  return p_tcb;
}

std::string gatt_tcb_get_holders_info_string(const tGATT_TCB* p_tcb) {
  std::stringstream stream;

  if (p_tcb->app_hold_link.size() == 0) {
    stream << "No ACL holders";
  } else {
    stream << "ACL holders gatt_if:";

    for (auto gatt_if : p_tcb->app_hold_link) {
      stream << static_cast<int>(gatt_if) << ",";
    }
  }
  return stream.str();
}

/*******************************************************************************
 *
 * Function     gatt_tcb_dump
 *
 * Description  Print gatt_cb.tcb[] into dumpsys
 *
 * Returns      void
 *
 ******************************************************************************/
#define DUMPSYS_TAG "stack::gatt"
void gatt_tcb_dump(int fd) {
  std::stringstream stream;
  int in_use_cnt = 0;

  auto copy = tcb_state_history_.Pull();
  LOG_DUMPSYS(fd, "   last %zu tcb state transitions:", copy.size());
  for (const auto& it : copy) {
    LOG_DUMPSYS(fd, "   %s %s", EpochMillisToString(it.timestamp).c_str(),
                it.entry.ToString().c_str());
  }

  for (int i = 0; i < gatt_get_max_phy_channel(); i++) {
    tGATT_TCB* p_tcb = &gatt_cb.tcb[i];

    if (p_tcb->in_use) {
      in_use_cnt++;
      stream << "  id: " << +p_tcb->tcb_idx
             << "  address: " << ADDRESS_TO_LOGGABLE_STR(p_tcb->peer_bda)
             << "  transport: " << bt_transport_text(p_tcb->transport)
             << "  ch_state: " << gatt_channel_state_text(p_tcb->ch_state) << ", "
             << gatt_tcb_get_holders_info_string(p_tcb) << "\n";
    }
  }

  dprintf(fd, "TCB (GATT_MAX_PHY_CHANNEL: %d) in_use: %d\n%s\n", gatt_get_max_phy_channel(),
          in_use_cnt, stream.str().c_str());
}
#undef DUMPSYS_TAG

/*******************************************************************************
 *
 * Function         gatt_allocate_tcb_by_bdaddr
 *
 * Description      Locate or allocate a new tcb entry for matching bda.
 *
 * Returns          GATT_INDEX_INVALID if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_allocate_tcb_by_bdaddr(const RawAddress& bda, tBT_TRANSPORT transport) {
  /* search for existing tcb with matching bda    */
  uint8_t j = gatt_find_i_tcb_by_addr(bda, transport);
  if (j != GATT_INDEX_INVALID) {
    return &gatt_cb.tcb[j];
  }

  /* find free tcb */
  for (int i = 0; i < gatt_get_max_phy_channel(); i++) {
    tGATT_TCB* p_tcb = &gatt_cb.tcb[i];
    if (p_tcb->in_use) {
      continue;
    }

    *p_tcb = tGATT_TCB();

    p_tcb->pending_ind_q = fixed_queue_new(SIZE_MAX);
    p_tcb->conf_timer = alarm_new("gatt.conf_timer");
    p_tcb->ind_ack_timer = alarm_new("gatt.ind_ack_timer");
    p_tcb->in_use = true;
    p_tcb->tcb_idx = i;
    p_tcb->transport = transport;
    p_tcb->peer_bda = bda;
    p_tcb->eatt = 0;
    p_tcb->pending_user_mtu_exchange_value = 0;
    p_tcb->conn_ids_waiting_for_mtu_exchange = std::list<tCONN_ID>();
    p_tcb->max_user_mtu = 0;
    gatt_sr_init_cl_status(*p_tcb);
    gatt_cl_init_sr_status(*p_tcb);

    return p_tcb;
  }

  return NULL;
}

uint16_t gatt_get_mtu(const RawAddress& bda, tBT_TRANSPORT transport) {
  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bda, transport);
  if (!p_tcb) {
    return 0;
  }

  return p_tcb->payload_size;
}

bool gatt_is_pending_mtu_exchange(tGATT_TCB* p_tcb) {
  return p_tcb->pending_user_mtu_exchange_value != 0;
}

void gatt_set_conn_id_waiting_for_mtu_exchange(tGATT_TCB* p_tcb, tCONN_ID conn_id) {
  auto it = std::find(p_tcb->conn_ids_waiting_for_mtu_exchange.begin(),
                      p_tcb->conn_ids_waiting_for_mtu_exchange.end(), conn_id);
  if (it == p_tcb->conn_ids_waiting_for_mtu_exchange.end()) {
    p_tcb->conn_ids_waiting_for_mtu_exchange.push_back(conn_id);
    log::info("Put conn_id=0x{:04x} on wait list", conn_id);
  } else {
    log::info("Conn_id=0x{:04x} already on wait list", conn_id);
  }
}

/** gatt_build_uuid_to_stream will convert 32bit UUIDs to 128bit. This function
 * will return lenght required to build uuid, either |UUID:kNumBytes16| or
 * |UUID::kNumBytes128| */
uint8_t gatt_build_uuid_to_stream_len(const Uuid& uuid) {
  size_t len = uuid.GetShortestRepresentationSize();
  return len == Uuid::kNumBytes32 ? Uuid::kNumBytes128 : len;
}

/** Add UUID into stream. Returns UUID length. */
uint8_t gatt_build_uuid_to_stream(uint8_t** p_dst, const Uuid& uuid) {
  uint8_t* p = *p_dst;
  size_t len = uuid.GetShortestRepresentationSize();

  if (uuid.IsEmpty()) {
    return 0;
  }

  if (len == Uuid::kNumBytes16) {
    UINT16_TO_STREAM(p, uuid.As16Bit());
  } else if (len == Uuid::kNumBytes32) {
    /* always convert 32 bits into 128 bits */
    ARRAY_TO_STREAM(p, uuid.To128BitLE(), (int)Uuid::kNumBytes128);
    len = Uuid::kNumBytes128;
  } else if (len == Uuid::kNumBytes128) {
    ARRAY_TO_STREAM(p, uuid.To128BitLE(), (int)Uuid::kNumBytes128);
  }

  *p_dst = p;
  return len;
}

bool gatt_parse_uuid_from_cmd(Uuid* p_uuid_rec, uint16_t uuid_size, uint8_t** p_data) {
  bool ret = true;
  uint8_t* p_uuid = *p_data;

  switch (uuid_size) {
    case Uuid::kNumBytes16: {
      uint16_t val;
      STREAM_TO_UINT16(val, p_uuid);
      *p_uuid_rec = Uuid::From16Bit(val);
      *p_data += Uuid::kNumBytes16;
      return true;
    }

    case Uuid::kNumBytes128: {
      *p_uuid_rec = Uuid::From128BitLE(p_uuid);
      *p_data += Uuid::kNumBytes128;
      return true;
    }

    /* do not allow 32 bits UUID in ATT PDU now */
    case Uuid::kNumBytes32:
      log::error("DO NOT ALLOW 32 BITS UUID IN ATT PDU");
      return false;
    case 0:
    default:
      if (uuid_size != 0) {
        ret = false;
      }
      log::warn("invalid uuid size");
      break;
  }

  return ret;
}

/*******************************************************************************
 *
 * Function         gatt_start_rsp_timer
 *
 * Description      Start a wait_for_response timer.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_start_rsp_timer(tGATT_CLCB* p_clcb) {
  uint64_t timeout_ms = GATT_WAIT_FOR_RSP_TIMEOUT_MS;

  if (p_clcb->operation == GATTC_OPTYPE_DISCOVERY && p_clcb->op_subtype == GATT_DISC_SRVC_ALL) {
    timeout_ms = GATT_WAIT_FOR_DISC_RSP_TIMEOUT_MS;
  }

  // TODO: The tGATT_CLCB memory and state management needs cleanup,
  // and then the timers can be allocated elsewhere.
  if (p_clcb->gatt_rsp_timer_ent == NULL) {
    p_clcb->gatt_rsp_timer_ent = alarm_new("gatt.gatt_rsp_timer_ent");
  }
  alarm_set_on_mloop(p_clcb->gatt_rsp_timer_ent, timeout_ms, gatt_rsp_timeout, p_clcb);
}

/*******************************************************************************
 *
 * Function         gatt_stop_rsp_timer
 *
 * Description      Stops a GATT response timer.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_stop_rsp_timer(tGATT_CLCB* p_clcb) { alarm_cancel(p_clcb->gatt_rsp_timer_ent); }

/*******************************************************************************
 *
 * Function         gatt_start_conf_timer
 *
 * Description      Start a wait_for_confirmation timer.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_start_conf_timer(tGATT_TCB* p_tcb, uint16_t cid) {
  /* start notification cache timer */
  if (p_tcb->eatt && cid != L2CAP_ATT_CID) {
    EattExtension::GetInstance()->StartIndicationConfirmationTimer(p_tcb->peer_bda, cid);
  } else {
    alarm_set_on_mloop(p_tcb->conf_timer, GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                       gatt_indication_confirmation_timeout, p_tcb);
  }
}

/*******************************************************************************
 *
 * Function         gatt_stop_conf_timer
 *
 * Description      Start a wait_for_confirmation timer.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_stop_conf_timer(tGATT_TCB& tcb, uint16_t cid) {
  /* start notification cache timer */
  if (tcb.eatt && cid != L2CAP_ATT_CID) {
    EattExtension::GetInstance()->StopIndicationConfirmationTimer(tcb.peer_bda, cid);
  } else {
    alarm_cancel(tcb.conf_timer);
  }
}

/*******************************************************************************
 *
 * Function         gatt_start_ind_ack_timer
 *
 * Description      start the application ack timer
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_start_ind_ack_timer(tGATT_TCB& tcb, uint16_t cid) {
  /* start notification cache timer */
  if (tcb.eatt && cid != L2CAP_ATT_CID) {
    EattExtension::GetInstance()->StartAppIndicationTimer(tcb.peer_bda, cid);
  } else {
    alarm_set_on_mloop(tcb.ind_ack_timer, GATT_WAIT_FOR_RSP_TIMEOUT_MS, gatt_ind_ack_timeout, &tcb);
  }
}

/*******************************************************************************
 *
 * Function         gatt_stop_ind_ack_timer
 *
 * Description      stop the application ack timer
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_stop_ind_ack_timer(tGATT_TCB* p_tcb, uint16_t cid) {
  /* start notification cache timer */
  if (p_tcb->eatt && cid != L2CAP_ATT_CID) {
    EattExtension::GetInstance()->StopAppIndicationTimer(p_tcb->peer_bda, cid);
  } else {
    alarm_cancel(p_tcb->ind_ack_timer);
    p_tcb->ind_count = 0;
  }
}
/*******************************************************************************
 *
 * Function         gatt_rsp_timeout
 *
 * Description      Called when GATT wait for ATT command response timer expires
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_rsp_timeout(void* data) {
  tGATT_CLCB* p_clcb = (tGATT_CLCB*)data;

  if (p_clcb == NULL || p_clcb->p_tcb == NULL) {
    log::warn("clcb is already deleted");
    return;
  }
  if (p_clcb->operation == GATTC_OPTYPE_DISCOVERY && p_clcb->op_subtype == GATT_DISC_SRVC_ALL &&
      p_clcb->retry_count < GATT_REQ_RETRY_LIMIT) {
    uint8_t rsp_code;
    log::warn("retry discovery primary service");
    if (p_clcb != gatt_cmd_dequeue(*p_clcb->p_tcb, p_clcb->cid, &rsp_code)) {
      log::error("command queue out of sync, disconnect");
    } else {
      p_clcb->retry_count++;
      gatt_act_discovery(p_clcb);
      return;
    }
  }

  auto eatt_channel =
          EattExtension::GetInstance()->FindEattChannelByCid(p_clcb->p_tcb->peer_bda, p_clcb->cid);
  if (eatt_channel) {
    log::warn("conn_id: 0x{:04x} disconnecting EATT cid: {}", p_clcb->conn_id, p_clcb->cid);
    EattExtension::GetInstance()->Disconnect(p_clcb->p_tcb->peer_bda, p_clcb->cid);
  } else {
    log::warn("conn_id: 0x{:04x} disconnecting GATT...", p_clcb->conn_id);
    gatt_disconnect(p_clcb->p_tcb);
  }
}

/*******************************************************************************
 *
 * Function         gatt_indication_confirmation_timeout
 *
 * Description      Called when the indication confirmation timer expires
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_indication_confirmation_timeout(void* data) {
  tGATT_TCB* p_tcb = (tGATT_TCB*)data;

  if (p_tcb->indicate_handle == gatt_cb.handle_of_h_r) {
    /* There are some GATT Server only devices, that don't implement GATT client
     * functionalities, and ignore "Service Changed" indication. Android does
     * not have CCC in "Service Changed" characteristic, and sends it to all
     * bonded devices. This leads to situation where remote can ignore the
     * indication, and trigger 30s timeout, then reconnection in a loop.
     *
     * Since chances of healthy Client device keeping connection for 30 seconds
     * and not responding to "Service Changed" indication are very low, assume
     * we are dealing with Server only device, and don't trigger disconnection.
     *
     * TODO: In future, we should properly expose CCC, and send indication only
     * to devices that register for it.
     */
    log::warn(
            "Service Changed notification timed out in 30 seconds, assuming "
            "server-only remote, not disconnecting");
    gatts_proc_srv_chg_ind_ack(*p_tcb);
    return;
  }

  log::warn("disconnecting... bda:{} transport:{}", p_tcb->peer_bda, p_tcb->transport);
  gatt_disconnect(p_tcb);
}

/*******************************************************************************
 *
 * Function         gatt_ind_ack_timeout
 *
 * Description      Called when GATT wait for ATT handle confirmation timeout
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_ind_ack_timeout(void* data) {
  tGATT_TCB* p_tcb = (tGATT_TCB*)data;
  log::assert_that(p_tcb != nullptr, "assert failed: p_tcb != nullptr");

  log::warn("send ack now");
  p_tcb->ind_count = 0;
  /*TODO: For now ATT used only, but we need to have timeout per CID
   * and use it here corretly.
   */
  attp_send_cl_confirmation_msg(*p_tcb, L2CAP_ATT_CID);
}
/*******************************************************************************
 *
 * Description      Search for a service that owns a specific handle.
 *
 * Returns          GATT_MAX_SR_PROFILES if not found. Otherwise the index of
 *                  the service.
 *
 ******************************************************************************/
std::list<tGATT_SRV_LIST_ELEM>::iterator gatt_sr_find_i_rcb_by_handle(uint16_t handle) {
  auto it = gatt_cb.srv_list_info->begin();

  for (; it != gatt_cb.srv_list_info->end(); it++) {
    if (it->s_hdl <= handle && it->e_hdl >= handle) {
      return it;
    }
  }

  return it;
}

/*******************************************************************************
 *
 * Function         gatt_sr_get_sec_info
 *
 * Description      Get the security flag and key size information for the peer
 *                  device.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_sr_get_sec_info(const RawAddress& rem_bda, tBT_TRANSPORT transport,
                          tGATT_SEC_FLAG* p_sec_flag, uint8_t* p_key_size) {
  tGATT_SEC_FLAG flags = {};
  flags.is_link_key_known = BTM_IsLinkKeyKnown(rem_bda, transport);
  flags.is_link_key_authed = BTM_IsLinkKeyAuthed(rem_bda, transport);
  flags.is_encrypted = BTM_IsEncrypted(rem_bda, transport);
  flags.can_read_discoverable_characteristics = BTM_CanReadDiscoverableCharacteristics(rem_bda);

  *p_key_size = btm_ble_read_sec_key_size(rem_bda);
  *p_sec_flag = flags;
}
/*******************************************************************************
 *
 * Function         gatt_sr_send_req_callback
 *
 * Description
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_sr_send_req_callback(tCONN_ID conn_id, uint32_t trans_id, tGATTS_REQ_TYPE type,
                               tGATTS_DATA* p_data) {
  tGATT_IF gatt_if = gatt_get_gatt_if(conn_id);
  tGATT_REG* p_reg = gatt_get_regcb(gatt_if);

  if (!p_reg) {
    log::error("p_reg not found discard request");
    return;
  }

  if (p_reg->in_use && p_reg->app_cb.p_req_cb) {
    (*p_reg->app_cb.p_req_cb)(conn_id, trans_id, type, p_data);
  } else {
    log::warn("Call back not found for application conn_id={}", conn_id);
  }
}

/*******************************************************************************
 *
 * Function         gatt_send_error_rsp
 *
 * Description      This function sends an error response.
 *
 * Returns          void
 *
 ******************************************************************************/
tGATT_STATUS gatt_send_error_rsp(tGATT_TCB& tcb, uint16_t cid, uint8_t err_code, uint8_t op_code,
                                 uint16_t handle, bool deq) {
  tGATT_STATUS status;
  BT_HDR* p_buf;

  tGATT_SR_MSG msg;
  msg.error.cmd_code = op_code;
  msg.error.reason = err_code;
  msg.error.handle = handle;

  uint16_t payload_size = gatt_tcb_get_payload_size(tcb, cid);
  p_buf = attp_build_sr_msg(tcb, GATT_RSP_ERROR, &msg, payload_size);
  if (p_buf != NULL) {
    status = attp_send_sr_msg(tcb, cid, p_buf);
  } else {
    status = GATT_INSUF_RESOURCE;
  }

  if (deq) {
    gatt_dequeue_sr_cmd(tcb, cid);
  }

  return status;
}

/*******************************************************************************
 *
 * Function         gatt_add_sdp_record
 *
 * Description      This function add a SDP record for a GATT primary service
 *
 * Returns          0 if error else sdp handle for the record.
 *
 ******************************************************************************/
uint32_t gatt_add_sdp_record(const Uuid& uuid, uint16_t start_hdl, uint16_t end_hdl) {
  uint8_t buff[60];
  uint8_t* p = buff;

  log::verbose("s_hdl=0x{:x}  s_hdl=0x{:x}", start_hdl, end_hdl);

  uint32_t sdp_handle = get_legacy_stack_sdp_api()->handle.SDP_CreateRecord();
  if (sdp_handle == 0) {
    return 0;
  }

  switch (uuid.GetShortestRepresentationSize()) {
    case Uuid::kNumBytes16: {
      uint16_t tmp = uuid.As16Bit();
      if (!get_legacy_stack_sdp_api()->handle.SDP_AddServiceClassIdList(sdp_handle, 1, &tmp)) {
        log::warn("Unable to add SDP attribute for 16 bit uuid");
      }
      break;
    }

    case Uuid::kNumBytes32: {
      UINT8_TO_BE_STREAM(p, (UUID_DESC_TYPE << 3) | SIZE_FOUR_BYTES);
      uint32_t tmp = uuid.As32Bit();
      UINT32_TO_BE_STREAM(p, tmp);
      if (!get_legacy_stack_sdp_api()->handle.SDP_AddAttribute(
                  sdp_handle, ATTR_ID_SERVICE_CLASS_ID_LIST, DATA_ELE_SEQ_DESC_TYPE,
                  (uint32_t)(p - buff), buff)) {
        log::warn("Unable to add SDP attribute for 32 bit uuid handle:{}", sdp_handle);
      }
      break;
    }

    case Uuid::kNumBytes128:
      UINT8_TO_BE_STREAM(p, (UUID_DESC_TYPE << 3) | SIZE_SIXTEEN_BYTES);
      ARRAY_TO_BE_STREAM(p, uuid.To128BitBE().data(), (int)Uuid::kNumBytes128);
      if (!get_legacy_stack_sdp_api()->handle.SDP_AddAttribute(
                  sdp_handle, ATTR_ID_SERVICE_CLASS_ID_LIST, DATA_ELE_SEQ_DESC_TYPE,
                  (uint32_t)(p - buff), buff)) {
        log::warn("Unable to add SDP attribute for 128 bit uuid handle:{}", sdp_handle);
      }
      break;
  }

  /*** Fill out the protocol element sequence for SDP ***/
  tSDP_PROTOCOL_ELEM proto_elem_list[2];
  proto_elem_list[0].protocol_uuid = UUID_PROTOCOL_L2CAP;
  proto_elem_list[0].num_params = 1;
  proto_elem_list[0].params[0] = BT_PSM_ATT;
  proto_elem_list[1].protocol_uuid = UUID_PROTOCOL_ATT;
  proto_elem_list[1].num_params = 2;
  proto_elem_list[1].params[0] = start_hdl;
  proto_elem_list[1].params[1] = end_hdl;

  if (!get_legacy_stack_sdp_api()->handle.SDP_AddProtocolList(sdp_handle, 2, proto_elem_list)) {
    log::warn("Unable to add SDP protocol list for l2cap and att");
  }

  /* Make the service browseable */
  uint16_t list = UUID_SERVCLASS_PUBLIC_BROWSE_GROUP;
  if (!get_legacy_stack_sdp_api()->handle.SDP_AddUuidSequence(sdp_handle, ATTR_ID_BROWSE_GROUP_LIST,
                                                              1, &list)) {
    log::warn("Unable to add SDP uuid sequence public browse group");
  }

  return sdp_handle;
}

#if GATT_CONFORMANCE_TESTING == TRUE
/*******************************************************************************
 *
 * Function         gatt_set_err_rsp
 *
 * Description      This function is called to set the test confirm value
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_set_err_rsp(bool enable, uint8_t req_op_code, uint8_t err_status) {
  log::verbose("enable={} op_code={}, err_status={}", enable, req_op_code, err_status);
  gatt_cb.enable_err_rsp = enable;
  gatt_cb.req_op_code = req_op_code;
  gatt_cb.err_status = err_status;
}
#endif

/*******************************************************************************
 *
 * Function         gatt_get_regcb
 *
 * Description      The function returns the registration control block.
 *
 * Returns          pointer to the registration control block or NULL
 *
 ******************************************************************************/
tGATT_REG* gatt_get_regcb(tGATT_IF gatt_if) {
  uint8_t ii = (uint8_t)gatt_if;
  tGATT_REG* p_reg = NULL;

  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    auto it = gatt_cb.cl_rcb_map.find(gatt_if);
    if (it == gatt_cb.cl_rcb_map.end()) {
      log::warn("unknown gatt_if = {}", ii);
      return NULL;
    }
    p_reg = it->second.get();
  } else {
    // Index for cl_rcb is always 1 less than gatt_if.
    if (ii < 1 || ii > GATT_MAX_APPS) {
      log::warn("gatt_if out of range = {}", ii);
      return NULL;
    }
    p_reg = &gatt_cb.cl_rcb[ii - 1];
  }

  if (!p_reg->in_use) {
    log::warn("gatt_if found but not in use.");
    return NULL;
  }

  return p_reg;
}

/*******************************************************************************
 *
 * Function         gatt_tcb_is_cid_busy
 *
 * Description      The function check if channel with given cid is busy
 *
 * Returns          True when busy
 *
 ******************************************************************************/

bool gatt_tcb_is_cid_busy(tGATT_TCB& tcb, uint16_t cid) {
  if (cid == tcb.att_lcid) {
    return !tcb.cl_cmd_q.empty();
  }

  EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
  if (channel == nullptr) {
    log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
    return false;
  }

  return !channel->cl_cmd_q_.empty();
}
/*******************************************************************************
 *
 * Function         gatt_clcb_alloc
 *
 * Description      The function allocates a GATT  connection link control block
 *
 * Returns          NULL if not found. Otherwise pointer to the connection link
 *                  block.
 *
 ******************************************************************************/
tGATT_CLCB* gatt_clcb_alloc(tCONN_ID conn_id) {
  tGATT_CLCB clcb = {};
  tGATT_IF gatt_if = gatt_get_gatt_if(conn_id);
  tTCB_IDX tcb_idx = gatt_get_tcb_idx(conn_id);
  tGATT_TCB* p_tcb = gatt_get_tcb_by_idx(tcb_idx);
  tGATT_REG* p_reg = gatt_get_regcb(gatt_if);

  clcb.conn_id = conn_id;
  clcb.p_reg = p_reg;
  clcb.p_tcb = p_tcb;
  /* Use eatt only when clients wants that */
  clcb.cid = gatt_tcb_get_att_cid(*p_tcb, p_reg->eatt_support);

  gatt_cb.clcb_queue.emplace_back(clcb);
  auto p_clcb = &(gatt_cb.clcb_queue.back());

  return p_clcb;
}

/*******************************************************************************
 *
 * Function         gatt_tcb_get_cid_available_for_indication
 *
 * Description      This function checks if indication can be send
 *
 * Returns         true when stack is busy with waiting on indication
 *                 confirmation, false otherwise
 *
 ******************************************************************************/
bool gatt_tcb_get_cid_available_for_indication(tGATT_TCB* p_tcb, bool eatt_support,
                                               uint16_t** indicated_handle_p, uint16_t* cid_p) {
  if (p_tcb->eatt && eatt_support) {
    EattChannel* channel =
            EattExtension::GetInstance()->GetChannelAvailableForIndication(p_tcb->peer_bda);
    if (channel) {
      *indicated_handle_p = &channel->indicate_handle_;
      *cid_p = channel->cid_;
      return true;
    }
  }

  if (!GATT_HANDLE_IS_VALID(p_tcb->indicate_handle)) {
    *indicated_handle_p = &p_tcb->indicate_handle;
    *cid_p = p_tcb->att_lcid;
    return true;
  }

  return false;
}

/*******************************************************************************
 *
 * Function         gatt_tcb_find_indicate_handle
 *
 * Description      This function checks if indication can be send
 *
 * Returns          true when indication handle found, false otherwise
 *
 ******************************************************************************/
bool gatt_tcb_find_indicate_handle(tGATT_TCB& tcb, uint16_t cid, uint16_t* indicated_handle_p) {
  if (cid == tcb.att_lcid) {
    *indicated_handle_p = tcb.indicate_handle;
    tcb.indicate_handle = 0;
    return true;
  }

  if (tcb.eatt) {
    EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
    if (channel) {
      *indicated_handle_p = channel->indicate_handle_;
      channel->indicate_handle_ = 0;
      return true;
    }
  }

  return false;
}

/*******************************************************************************
 *
 * Function         gatt_tcb_get_att_cid
 *
 * Description      This function gets cid for the GATT operation
 *
 * Returns          Available CID
 *
 ******************************************************************************/

uint16_t gatt_tcb_get_att_cid(tGATT_TCB& tcb, bool eatt_support) {
  if (eatt_support && tcb.eatt) {
    EattChannel* channel =
            EattExtension::GetInstance()->GetChannelAvailableForClientRequest(tcb.peer_bda);
    if (channel) {
      return channel->cid_;
    }
  }
  return tcb.att_lcid;
}

/*******************************************************************************
 *
 * Function         gatt_tcb_get_payload_size
 *
 * Description      This function gets payload size for the GATT operation
 *
 * Returns          Payload size for sending/receiving data
 *
 ******************************************************************************/
uint16_t gatt_tcb_get_payload_size(tGATT_TCB& tcb, uint16_t cid) {
  if (!tcb.eatt || (cid == tcb.att_lcid)) {
    return tcb.payload_size;
  }

  EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
  if (channel == nullptr) {
    log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
    return 0;
  }

  /* ATT MTU for EATT is min from tx and rx mtu*/
  return std::min<uint16_t>(channel->tx_mtu_, channel->rx_mtu_);
}

/*******************************************************************************
 *
 * Function         gatt_clcb_dealloc
 *
 * Description      The function de-allocates a GATT connection link control
 *                  block
 *
 * Returns         None
 *
 ******************************************************************************/
static void gatt_clcb_dealloc(tGATT_CLCB* p_clcb) {
  if (p_clcb) {
    alarm_free(p_clcb->gatt_rsp_timer_ent);
    gatt_clcb_invalidate(p_clcb->p_tcb, p_clcb);
    for (auto clcb_it = gatt_cb.clcb_queue.begin(); clcb_it != gatt_cb.clcb_queue.end();
         clcb_it++) {
      if (&(*clcb_it) == p_clcb) {
        gatt_cb.clcb_queue.erase(clcb_it);
        return;
      }
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_clcb_invalidate
 *
 * Description      The function invalidates already scheduled p_clcb.
 *
 * Returns         None
 *
 ******************************************************************************/
void gatt_clcb_invalidate(tGATT_TCB* p_tcb, const tGATT_CLCB* p_clcb) {
  std::deque<tGATT_CMD_Q>* cl_cmd_q_p;
  uint16_t cid = p_clcb->cid;

  if (!p_tcb->pending_enc_clcb.empty()) {
    for (size_t i = 0; i < p_tcb->pending_enc_clcb.size(); i++) {
      if (p_tcb->pending_enc_clcb.at(i) == p_clcb) {
        log::warn("Removing clcb ({}) for conn id=0x{:04x} from pending_enc_clcb",
                  std::format_ptr(p_clcb), p_clcb->conn_id);
        p_tcb->pending_enc_clcb.at(i) = NULL;
        break;
      }
    }
  }

  if (cid == p_tcb->att_lcid) {
    cl_cmd_q_p = &p_tcb->cl_cmd_q;
  } else {
    EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(p_tcb->peer_bda, cid);
    if (channel == nullptr) {
      log::warn("{}, cid 0x{:02x} already disconnected", p_tcb->peer_bda, cid);
      return;
    }
    cl_cmd_q_p = &channel->cl_cmd_q_;
  }

  if (cl_cmd_q_p->empty()) {
    return;
  }

  auto iter = std::find_if(cl_cmd_q_p->begin(), cl_cmd_q_p->end(),
                           [p_clcb](auto& el) { return el.p_clcb == p_clcb; });

  if (iter == cl_cmd_q_p->end()) {
    return;
  }

  if (iter->to_send) {
    /* If command was not send, just remove the entire element */
    cl_cmd_q_p->erase(iter);
    log::warn("Removing scheduled clcb ({}) for conn_id=0x{:04x}", std::format_ptr(p_clcb),
              p_clcb->conn_id);
  } else {
    /* If command has been sent, just invalidate p_clcb pointer for proper
     * response handling */
    iter->p_clcb = NULL;
    log::warn("Invalidating clcb ({}) for already sent request on conn_id=0x{:04x}",
              std::format_ptr(p_clcb), p_clcb->conn_id);
  }
}
/*******************************************************************************
 *
 * Function         gatt_find_tcb_by_cid
 *
 * Description      The function searches for an empty entry
 *                   in registration info table for GATT client
 *
 * Returns           NULL if not found. Otherwise pointer to the rcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_find_tcb_by_cid(uint16_t lcid) {
  uint16_t xx = 0;
  tGATT_TCB* p_tcb = NULL;

  for (xx = 0; xx < gatt_get_max_phy_channel(); xx++) {
    if (gatt_cb.tcb[xx].in_use && ((gatt_cb.tcb[xx].att_lcid == lcid) ||
                                   (EattExtension::GetInstance()->FindEattChannelByCid(
                                            gatt_cb.tcb[xx].peer_bda, lcid) != nullptr))) {
      p_tcb = &gatt_cb.tcb[xx];
      break;
    }
  }
  return p_tcb;
}

void gatt_sr_copy_prep_cnt_to_cback_cnt(tGATT_TCB& tcb) {
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    for (auto& [i, cnt] : tcb.prep_cnt_map) {
      tcb.sr_cmd.cback_cnt_map[i] = 1;
    }
  } else {
    for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
      if (tcb.prep_cnt[i]) {
        tcb.sr_cmd.cback_cnt[i] = 1;
      }
    }
  }
}

/* Get outstanding server command pointer by the transaction id */
tGATT_SR_CMD* gatt_sr_get_cmd_by_trans_id(tGATT_TCB* p_tcb, uint32_t trans_id) {
  if (p_tcb->sr_cmd.trans_id == trans_id) {
    return &p_tcb->sr_cmd;
  }

  if (!p_tcb->eatt) {
    return nullptr;
  }

  EattChannel* channel =
          EattExtension::GetInstance()->FindEattChannelByTransId(p_tcb->peer_bda, trans_id);
  if (!channel) {
    return nullptr;
  }

  return &channel->server_outstanding_cmd_;
}
/*******************************************************************************
 *
 * Function         gatt_sr_is_cback_cnt_zero
 *
 * Description      The function searches all LCB with macthing bd address
 *
 * Returns          True if thetotal application callback count is zero
 *
 ******************************************************************************/
bool gatt_sr_is_cback_cnt_zero(tGATT_TCB& tcb) {
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    return tcb.sr_cmd.cback_cnt_map.empty();
  } else {
    for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
      if (tcb.sr_cmd.cback_cnt[i]) {
        return false;
      }
    }
    return true;
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_is_prep_cnt_zero
 *
 * Description      Check the prepare write request count is zero or not
 *
 * Returns          True no prepare write request
 *
 ******************************************************************************/
bool gatt_sr_is_prep_cnt_zero(tGATT_TCB& tcb) {
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    return tcb.prep_cnt_map.empty();
  } else {
    for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
      if (tcb.prep_cnt[i]) {
        return false;
      }
    }
    return true;
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_reset_cback_cnt
 *
 * Description      Reset the application callback count to zero
 *
 * Returns         None
 *
 ******************************************************************************/
void gatt_sr_reset_cback_cnt(tGATT_TCB& tcb, uint16_t cid) {
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    if (cid == tcb.att_lcid) {
      tcb.sr_cmd.cback_cnt_map.clear();
    } else {
      EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
      if (channel == nullptr) {
        log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
        return;
      }
      channel->server_outstanding_cmd_.cback_cnt_map.clear();
    }
  } else {
    for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
      if (cid == tcb.att_lcid) {
        tcb.sr_cmd.cback_cnt[i] = 0;
      } else {
        EattChannel* channel =
                EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
        if (channel == nullptr) {
          log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
          return;
        }
        channel->server_outstanding_cmd_.cback_cnt[i] = 0;
      }
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_reset_prep_cnt
 *
 * Description     Reset the prep write count to zero
 *
 * Returns        None
 *
 ******************************************************************************/
void gatt_sr_reset_prep_cnt(tGATT_TCB& tcb) {
  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    tcb.prep_cnt[i] = 0;
  }
}

/* Get pointer to server command on given cid */
tGATT_SR_CMD* gatt_sr_get_cmd_by_cid(tGATT_TCB& tcb, uint16_t cid) {
  tGATT_SR_CMD* sr_cmd_p;

  log::info("cid: {} tcb cid {}", int(cid), tcb.att_lcid);
  if (cid == tcb.att_lcid) {
    sr_cmd_p = &tcb.sr_cmd;
  } else {
    EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
    if (channel == nullptr) {
      log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
      return nullptr;
    }

    sr_cmd_p = &channel->server_outstanding_cmd_;
  }

  return sr_cmd_p;
}

/* Get pointer to the context of outstanding multi request */
tGATT_READ_MULTI* gatt_sr_get_read_multi(tGATT_TCB& tcb, uint16_t cid) {
  tGATT_READ_MULTI* read_multi_p;

  log::info("cid: {} tcb cid {}", int(cid), tcb.att_lcid);
  if (cid == tcb.att_lcid) {
    read_multi_p = &tcb.sr_cmd.multi_req;
  } else {
    EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
    if (channel == nullptr) {
      log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
      return nullptr;
    }
    read_multi_p = &channel->server_outstanding_cmd_.multi_req;
  }

  return read_multi_p;
}

/*******************************************************************************
 *
 * Function         gatt_sr_update_cback_cnt
 *
 * Description    Update the application callback count
 *
 * Returns           None
 *
 ******************************************************************************/
void gatt_sr_update_cback_cnt(tGATT_TCB& tcb, uint16_t cid, tGATT_IF gatt_if, bool is_inc,
                              bool is_reset_first) {
  tGATT_SR_CMD* sr_cmd_p;

  if (cid == tcb.att_lcid) {
    sr_cmd_p = &tcb.sr_cmd;
  } else {
    EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
    if (channel == nullptr) {
      log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
      return;
    }
    sr_cmd_p = &channel->server_outstanding_cmd_;
  }

  if (is_reset_first) {
    gatt_sr_reset_cback_cnt(tcb, cid);
  }

  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    if (is_inc) {
      sr_cmd_p->cback_cnt_map[gatt_if]++;
    } else {
      auto cback_cnt_it = sr_cmd_p->cback_cnt_map.find(gatt_if);
      if (cback_cnt_it != sr_cmd_p->cback_cnt_map.end()) {
        if ((--cback_cnt_it->second) <= 0) {
          sr_cmd_p->cback_cnt_map.erase(cback_cnt_it);
        }
      }
    }
  } else {
    uint8_t idx = ((uint8_t)gatt_if) - 1;

    if (is_inc) {
      sr_cmd_p->cback_cnt[idx]++;
    } else {
      if (sr_cmd_p->cback_cnt[idx]) {
        sr_cmd_p->cback_cnt[idx]--;
      }
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_update_prep_cnt
 *
 * Description    Update the prepare write request count
 *
 * Returns           None
 *
 ******************************************************************************/
void gatt_sr_update_prep_cnt(tGATT_TCB& tcb, tGATT_IF gatt_if, bool is_inc, bool is_reset_first) {
  uint8_t idx = ((uint8_t)gatt_if) - 1;

  log::verbose("tcb idx={} gatt_if={} is_inc={} is_reset_first={}", tcb.tcb_idx, gatt_if, is_inc,
               is_reset_first);

  if (is_reset_first) {
    gatt_sr_reset_prep_cnt(tcb);
  }
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    if (is_inc) {
      tcb.prep_cnt_map[gatt_if]++;
    } else {
      auto prep_cnt_i = tcb.prep_cnt_map.find(gatt_if);
      if (prep_cnt_i != tcb.prep_cnt_map.end()) {
        if (--prep_cnt_i->second <= 0) {
          tcb.prep_cnt_map.erase(prep_cnt_i);
        }
      }
    }
  } else {
    if (is_inc) {
      tcb.prep_cnt[idx]++;
    } else {
      if (tcb.prep_cnt[idx]) {
        tcb.prep_cnt[idx]--;
      }
    }
  }
}

static bool gatt_is_anybody_interested_in_connection(const RawAddress& bda) {
  if (connection_manager::is_background_connection(bda)) {
    log::debug("{} is in background connection", bda);
    return true;
  }

  for (size_t i = 1; i <= GATT_MAX_APPS; i++) {
    tGATT_REG* p_reg = &gatt_cb.cl_rcb[i - 1];
    if (p_reg->in_use && p_reg->direct_connect_request.count(bda) > 0) {
      log::debug("gatt_if {} interested in connection to {}", i, bda);
      return true;
    }
  }
  return false;
}

/** Cancel LE Create Connection request */
bool gatt_cancel_open(tGATT_IF gatt_if, const RawAddress& bda) {
  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bda, BT_TRANSPORT_LE);
  if (!p_tcb) {
    /* TCB is not allocated when trying to connect under this flag.
     * but device address is storred in the tGATT_REG. Make sure to remove
     * the address from the list when cancel is called.
     */

    tGATT_REG* p_reg = gatt_get_regcb(gatt_if);
    if (!p_reg) {
      log::error("Unable to find registered app gatt_if={}", gatt_if);
    } else {
      log::info("Removing {} from direct list", bda);
      p_reg->direct_connect_request.erase(bda);
    }
    if (!gatt_is_anybody_interested_in_connection(bda)) {
      gatt_cancel_connect(bda, static_cast<tBT_TRANSPORT>(BT_TRANSPORT_LE));
    }
    return true;
  }

  if (gatt_get_ch_state(p_tcb) == GATT_CH_OPEN) {
    log::error("link connected Too late to cancel");
    return false;
  }

  gatt_update_app_use_link_flag(gatt_if, p_tcb, false, false);

  if (p_tcb->app_hold_link.empty()) {
    log::debug("Client reference count is zero disconnecting device gatt_if:{} peer:{}", gatt_if,
               bda);
    gatt_disconnect(p_tcb);
  }

  if (!connection_manager::direct_connect_remove(gatt_if, bda)) {
    if (!connection_manager::is_background_connection(bda)) {
      if (!com::android::bluetooth::flags::gatt_fix_multiple_direct_connect() ||
          p_tcb->app_hold_link.empty()) {
        bluetooth::shim::ACL_IgnoreLeConnectionFrom(BTM_Sec_GetAddressWithType(bda));
      }
      log::info(
              "Gatt connection manager has no background record but  removed "
              "filter acceptlist gatt_if:{} peer:{}",
              gatt_if, bda);
    } else {
      log::info(
              "Gatt connection manager maintains a background record preserving "
              "filter acceptlist gatt_if:{} peer:{}",
              gatt_if, bda);
    }
  }

  return true;
}

/** Enqueue this command */
bool gatt_cmd_enq(tGATT_TCB& tcb, tGATT_CLCB* p_clcb, bool to_send, uint8_t op_code,
                  BT_HDR* p_buf) {
  tGATT_CMD_Q cmd;
  cmd.to_send = to_send; /* waiting to be sent */
  cmd.op_code = op_code;
  cmd.p_cmd = p_buf;
  cmd.p_clcb = p_clcb;
  cmd.cid = p_clcb->cid;

  if (p_clcb->cid == tcb.att_lcid) {
    tcb.cl_cmd_q.push_back(cmd);
  } else {
    EattChannel* channel =
            EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cmd.cid);
    if (channel == nullptr) {
      log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cmd.cid);
      return false;
    }
    channel->cl_cmd_q_.push_back(cmd);
  }

  return true;
}

/** dequeue the command in the client CCB command queue */
tGATT_CLCB* gatt_cmd_dequeue(tGATT_TCB& tcb, uint16_t cid, uint8_t* p_op_code) {
  std::deque<tGATT_CMD_Q>* cl_cmd_q_p;

  if (cid == tcb.att_lcid) {
    cl_cmd_q_p = &tcb.cl_cmd_q;
  } else {
    EattChannel* channel = EattExtension::GetInstance()->FindEattChannelByCid(tcb.peer_bda, cid);
    if (channel == nullptr) {
      log::warn("{}, cid 0x{:02x} already disconnected", tcb.peer_bda, cid);
      return nullptr;
    }

    cl_cmd_q_p = &channel->cl_cmd_q_;
  }

  if (cl_cmd_q_p->empty()) {
    return nullptr;
  }

  tGATT_CMD_Q cmd = cl_cmd_q_p->front();
  tGATT_CLCB* p_clcb = cmd.p_clcb;
  *p_op_code = cmd.op_code;

  /* Note: If GATT client deregistered while the ATT request was on the way to
   * peer, device p_clcb will be null.
   */
  if (p_clcb && p_clcb->cid != cid) {
    log::warn("CID does not match ({}!={}), conn_id=0x{:04x}", p_clcb->cid, cid, p_clcb->conn_id);
  }

  cl_cmd_q_p->pop_front();

  return p_clcb;
}

/** Send out the ATT message for write */
tGATT_STATUS gatt_send_write_msg(tGATT_TCB& tcb, tGATT_CLCB* p_clcb, uint8_t op_code,
                                 uint16_t handle, uint16_t len, uint16_t offset, uint8_t* p_data) {
  tGATT_CL_MSG msg;
  msg.attr_value.handle = handle;
  msg.attr_value.len = len;
  msg.attr_value.offset = offset;
  memcpy(msg.attr_value.value, p_data, len);

  /* write by handle */
  return attp_send_cl_msg(tcb, p_clcb, op_code, &msg);
}

/*******************************************************************************
 *
 * Function         gatt_is_outstanding_msg_in_att_send_queue
 *
 * Description      checks if there is message on the ATT fixed channel to send
 *
 * Returns          true: on success; false otherwise
 *
 ******************************************************************************/
bool gatt_is_outstanding_msg_in_att_send_queue(const tGATT_TCB& tcb) {
  return !tcb.cl_cmd_q.empty() && (tcb.cl_cmd_q.front()).to_send;
}
/*******************************************************************************
 *
 * Function         gatt_end_operation
 *
 * Description      This function ends a discovery, send callback and finalize
 *                  some control value.
 *
 * Returns          16 bits uuid.
 *
 ******************************************************************************/
void gatt_end_operation(tGATT_CLCB* p_clcb, tGATT_STATUS status, void* p_data) {
  tGATT_CL_COMPLETE cb_data;
  tGATT_REG* p_reg = gatt_get_regcb(gatt_get_gatt_if(p_clcb->conn_id));
  tGATT_CMPL_CBACK* p_cmpl_cb =
          ((p_clcb->p_reg == p_reg) && p_reg) ? p_reg->app_cb.p_cmpl_cb : NULL;
  tGATT_DISC_CMPL_CB* p_disc_cmpl_cb =
          ((p_clcb->p_reg == p_reg) && p_reg) ? p_clcb->p_reg->app_cb.p_disc_cmpl_cb : NULL;
  tGATTC_OPTYPE op = p_clcb->operation;
  tGATT_DISC_TYPE disc_type = GATT_DISC_MAX;
  tCONN_ID conn_id;
  uint8_t operation;

  log::verbose("status={} op={} subtype={}", status, p_clcb->operation, p_clcb->op_subtype);
  memset(&cb_data.att_value, 0, sizeof(tGATT_VALUE));

  if (p_cmpl_cb != NULL && p_clcb->operation != 0) {
    if (p_clcb->operation == GATTC_OPTYPE_READ) {
      cb_data.att_value.handle = p_clcb->s_handle;
      cb_data.att_value.len = p_clcb->counter;

      if (cb_data.att_value.len > GATT_MAX_ATTR_LEN) {
        log::warn("Large cb_data.att_value, size={}", cb_data.att_value.len);
        cb_data.att_value.len = GATT_MAX_ATTR_LEN;
      }

      if (p_data && p_clcb->counter) {
        memcpy(cb_data.att_value.value, p_data, cb_data.att_value.len);
      }
    }

    if (p_clcb->operation == GATTC_OPTYPE_WRITE) {
      memset(&cb_data.att_value, 0, sizeof(tGATT_VALUE));
      cb_data.handle = cb_data.att_value.handle = p_clcb->s_handle;
      if (p_clcb->op_subtype == GATT_WRITE_PREPARE) {
        if (p_data) {
          cb_data.att_value = *((tGATT_VALUE*)p_data);
        } else {
          log::verbose("Rcv Prepare write rsp but no data");
        }
      }
    }

    if (p_clcb->operation == GATTC_OPTYPE_CONFIG) {
      cb_data.mtu = p_clcb->p_tcb->payload_size;
    }

    if (p_clcb->operation == GATTC_OPTYPE_DISCOVERY) {
      disc_type = static_cast<tGATT_DISC_TYPE>(p_clcb->op_subtype);
    }
  }

  osi_free_and_reset((void**)&p_clcb->p_attr_buf);

  operation = p_clcb->operation;
  conn_id = p_clcb->conn_id;
  gatt_stop_rsp_timer(p_clcb);

  gatt_clcb_dealloc(p_clcb);

  if (p_disc_cmpl_cb && (op == GATTC_OPTYPE_DISCOVERY)) {
    (*p_disc_cmpl_cb)(conn_id, disc_type, status);
  } else if (p_cmpl_cb && op) {
    (*p_cmpl_cb)(conn_id, op, status, &cb_data);
  } else {
    log::warn("not sent out op={} p_disc_cmpl_cb:{} p_cmpl_cb:{}", operation,
              std::format_ptr(p_disc_cmpl_cb), std::format_ptr(p_cmpl_cb));
  }
}

static void gatt_disconnect_complete_notify_user(const RawAddress& bda, tGATT_DISCONN_REASON reason,
                                                 tBT_TRANSPORT transport) {
  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bda, transport);

  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    for (auto& [i, p_reg] : gatt_cb.cl_rcb_map) {
      if (p_reg->in_use && p_reg->app_cb.p_conn_cb) {
        tCONN_ID conn_id =
                p_tcb ? gatt_create_conn_id(p_tcb->tcb_idx, p_reg->gatt_if) : GATT_INVALID_CONN_ID;
        (*p_reg->app_cb.p_conn_cb)(p_reg->gatt_if, bda, conn_id, kGattDisconnected, reason,
                                   transport);
      }

      if (p_reg->direct_connect_request.count(bda) > 0) {
        log::info("Removing device {} from the direct connect list of gatt_if {}", bda,
                  p_reg->gatt_if);
        p_reg->direct_connect_request.erase(bda);
      }
    }
  } else {
    for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
      tGATT_REG* p_reg = &gatt_cb.cl_rcb[i];
      if (p_reg->in_use && p_reg->app_cb.p_conn_cb) {
        tCONN_ID conn_id =
                p_tcb ? gatt_create_conn_id(p_tcb->tcb_idx, p_reg->gatt_if) : GATT_INVALID_CONN_ID;
        (*p_reg->app_cb.p_conn_cb)(p_reg->gatt_if, bda, conn_id, kGattDisconnected, reason,
                                   transport);
      }

      if (p_reg->direct_connect_request.count(bda) > 0) {
        log::info("Removing device {} from the direct connect list of gatt_if {}", bda,
                  p_reg->gatt_if);
        p_reg->direct_connect_request.erase(bda);
      }
    }
  }
}

/** This function cleans up the control blocks when L2CAP channel disconnect */
void gatt_cleanup_upon_disc(const RawAddress& bda, tGATT_DISCONN_REASON reason,
                            tBT_TRANSPORT transport) {
  log::verbose("");

  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bda, transport);
  if (!p_tcb) {
    log::info("Connection timeout bd_addr:{} reason:{} transport:{}", bda,
              gatt_disconnection_reason_text(reason), bt_transport_text(transport));

    /* Notify about timeout on direct connect */
    gatt_disconnect_complete_notify_user(bda, reason, transport);
    return;
  }

  gatt_set_ch_state(p_tcb, GATT_CH_CLOSE);

  if (transport == BT_TRANSPORT_LE) {
    /* Notify EATT about disconnection. */
    EattExtension::GetInstance()->Disconnect(p_tcb->peer_bda);
  }

  for (auto clcb_it = gatt_cb.clcb_queue.begin(); clcb_it != gatt_cb.clcb_queue.end();) {
    if (clcb_it->p_tcb != p_tcb) {
      ++clcb_it;
      continue;
    }

    gatt_stop_rsp_timer(&(*clcb_it));
    log::verbose("found p_clcb conn_id={}", clcb_it->conn_id);
    if (clcb_it->operation == GATTC_OPTYPE_NONE) {
      clcb_it = gatt_cb.clcb_queue.erase(clcb_it);
      continue;
    }

    tGATT_CLCB* p_clcb = &(*clcb_it);
    ++clcb_it;
    gatt_end_operation(p_clcb, GATT_ERROR, NULL);
  }

  /* Remove the outstanding ATT commnads if any */
  p_tcb->cl_cmd_q.clear();

  alarm_free(p_tcb->ind_ack_timer);
  p_tcb->ind_ack_timer = NULL;
  alarm_free(p_tcb->conf_timer);
  p_tcb->conf_timer = NULL;
  gatt_free_pending_ind(p_tcb);
  fixed_queue_free(p_tcb->sr_cmd.multi_rsp_q, NULL);
  p_tcb->sr_cmd.multi_rsp_q = NULL;

  gatt_disconnect_complete_notify_user(bda, reason, transport);

  *p_tcb = tGATT_TCB();
  log::verbose("exit");
}
/*******************************************************************************
 *
 * Function         gatt_dbg_req_op_name
 *
 * Description      Get op code description name, for debug information.
 *
 * Returns          uint8_t *: name of the operation.
 *
 ******************************************************************************/
char const* gatt_dbg_op_name(uint8_t op_code) {
  uint8_t pseduo_op_code_idx = op_code & (~GATT_WRITE_CMD_MASK);

  if (op_code == GATT_CMD_WRITE) {
    pseduo_op_code_idx = 0x14; /* just an index to op_code_name */
  }

  if (op_code == GATT_SIGN_CMD_WRITE) {
    pseduo_op_code_idx = 0x15; /* just an index to op_code_name */
  }

#define ARR_SIZE(a) (sizeof(a) / sizeof(a[0]))
  if (pseduo_op_code_idx < ARR_SIZE(op_code_name)) {
    return op_code_name[pseduo_op_code_idx];
  } else {
    return "Op Code Exceed Max";
  }
#undef ARR_SIZE
}

/** Remove the application interface for the specified background device */
bool gatt_auto_connect_dev_remove(tGATT_IF gatt_if, const RawAddress& bd_addr) {
  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bd_addr, BT_TRANSPORT_LE);
  if (p_tcb) {
    gatt_update_app_use_link_flag(gatt_if, p_tcb, false, false);
  }
  return connection_manager::background_connect_remove(gatt_if, bd_addr);
}

tCONN_ID gatt_create_conn_id(tTCB_IDX tcb_idx, tGATT_IF gatt_if) {
  return (tcb_idx << 8) | gatt_if;
}

tTCB_IDX gatt_get_tcb_idx(tCONN_ID conn_id) { return static_cast<tTCB_IDX>(conn_id >> 8); }

tGATT_IF gatt_get_gatt_if(tCONN_ID conn_id) { return static_cast<tGATT_IF>(conn_id); }

uint16_t gatt_get_mtu_pref(const tGATT_REG* p_reg, const RawAddress& bda) {
  auto mtu_pref = p_reg->mtu_prefs.find(bda);
  if (mtu_pref != p_reg->mtu_prefs.cend()) {
    return mtu_pref->second;
  }
  return 0;
}

uint16_t gatt_get_apps_preferred_mtu(const RawAddress& bda) {
  uint16_t preferred_mtu = 0;
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    for (auto& [i, p_reg] : gatt_cb.cl_rcb_map) {
      if (!p_reg->in_use) {
        continue;
      }

      preferred_mtu = std::max(preferred_mtu, gatt_get_mtu_pref(p_reg.get(), bda));
    }
  } else {
    for (auto& reg : gatt_cb.cl_rcb) {
      if (!reg.in_use) {
        continue;
      }

      preferred_mtu = std::max(preferred_mtu, gatt_get_mtu_pref(&reg, bda));
    }
  }

  return preferred_mtu;
}

void gatt_remove_apps_mtu_prefs(const RawAddress& bda) {
  if (com::android::bluetooth::flags::gatt_client_dynamic_allocation()) {
    for (auto& [i, p_reg] : gatt_cb.cl_rcb_map) {
      if (!p_reg->in_use) {
        continue;
      }
      p_reg.get()->mtu_prefs.erase(bda);
    }
  } else {
    for (auto& reg : gatt_cb.cl_rcb) {
      if (!reg.in_use) {
        continue;
      }
      reg.mtu_prefs.erase(bda);
    }
  }
}