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PL286/system/bt/stack/bnep/bnep_utils.cc

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/******************************************************************************
*
* Copyright (C) 2001-2012 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 BNEP utility functions
*
******************************************************************************/
#include <cutils/log.h>
#include <stdio.h>
#include <string.h>
#include "bnep_int.h"
#include "bt_common.h"
#include "bt_types.h"
#include "bt_utils.h"
#include "btm_int.h"
#include "btu.h"
#include "device/include/controller.h"
#include "osi/include/osi.h"
/******************************************************************************/
/* L O C A L F U N C T I O N P R O T O T Y P E S */
/******************************************************************************/
static uint8_t* bnepu_init_hdr(BT_HDR* p_buf, uint16_t hdr_len,
uint8_t pkt_type);
void bnepu_process_peer_multicast_filter_set(tBNEP_CONN* p_bcb,
uint8_t* p_filters, uint16_t len);
void bnepu_send_peer_multicast_filter_rsp(tBNEP_CONN* p_bcb,
uint16_t response_code);
/*******************************************************************************
*
* Function bnepu_find_bcb_by_cid
*
* Description This function searches the bcb table for an entry with the
* passed CID.
*
* Returns the BCB address, or NULL if not found.
*
******************************************************************************/
tBNEP_CONN* bnepu_find_bcb_by_cid(uint16_t cid) {
uint16_t xx;
tBNEP_CONN* p_bcb;
/* Look through each connection control block */
for (xx = 0, p_bcb = bnep_cb.bcb; xx < BNEP_MAX_CONNECTIONS; xx++, p_bcb++) {
if ((p_bcb->con_state != BNEP_STATE_IDLE) && (p_bcb->l2cap_cid == cid))
return (p_bcb);
}
/* If here, not found */
return (NULL);
}
/*******************************************************************************
*
* Function bnepu_find_bcb_by_bd_addr
*
* Description This function searches the BCB table for an entry with the
* passed Bluetooth Address.
*
* Returns the BCB address, or NULL if not found.
*
******************************************************************************/
tBNEP_CONN* bnepu_find_bcb_by_bd_addr(const RawAddress& p_bda) {
uint16_t xx;
tBNEP_CONN* p_bcb;
/* Look through each connection control block */
for (xx = 0, p_bcb = bnep_cb.bcb; xx < BNEP_MAX_CONNECTIONS; xx++, p_bcb++) {
if (p_bcb->con_state != BNEP_STATE_IDLE) {
if (p_bcb->rem_bda == p_bda) return (p_bcb);
}
}
/* If here, not found */
return (NULL);
}
/*******************************************************************************
*
* Function bnepu_allocate_bcb
*
* Description This function allocates a new BCB.
*
* Returns BCB address, or NULL if none available.
*
******************************************************************************/
tBNEP_CONN* bnepu_allocate_bcb(const RawAddress& p_rem_bda) {
uint16_t xx;
tBNEP_CONN* p_bcb;
/* Look through each connection control block for a free one */
for (xx = 0, p_bcb = bnep_cb.bcb; xx < BNEP_MAX_CONNECTIONS; xx++, p_bcb++) {
if (p_bcb->con_state == BNEP_STATE_IDLE) {
alarm_free(p_bcb->conn_timer);
memset((uint8_t*)p_bcb, 0, sizeof(tBNEP_CONN));
p_bcb->conn_timer = alarm_new("bnep.conn_timer");
p_bcb->rem_bda = p_rem_bda;
p_bcb->handle = xx + 1;
p_bcb->xmit_q = fixed_queue_new(SIZE_MAX);
return (p_bcb);
}
}
/* If here, no free BCB found */
return (NULL);
}
/*******************************************************************************
*
* Function bnepu_release_bcb
*
* Description This function releases a BCB.
*
* Returns void
*
******************************************************************************/
void bnepu_release_bcb(tBNEP_CONN* p_bcb) {
/* Ensure timer is stopped */
alarm_free(p_bcb->conn_timer);
p_bcb->conn_timer = NULL;
/* Drop any response pointer we may be holding */
p_bcb->con_state = BNEP_STATE_IDLE;
osi_free_and_reset((void**)&p_bcb->p_pending_data);
/* Free transmit queue */
while (!fixed_queue_is_empty(p_bcb->xmit_q)) {
osi_free(fixed_queue_try_dequeue(p_bcb->xmit_q));
}
fixed_queue_free(p_bcb->xmit_q, NULL);
p_bcb->xmit_q = NULL;
}
/*******************************************************************************
*
* Function bnep_send_conn_req
*
* Description This function sends a BNEP connection request to peer
*
* Returns void
*
******************************************************************************/
void bnep_send_conn_req(tBNEP_CONN* p_bcb) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t *p, *p_start;
BNEP_TRACE_DEBUG("%s: sending setup req with dst uuid %x", __func__,
p_bcb->dst_uuid.uu.uuid16);
p_buf->offset = L2CAP_MIN_OFFSET;
p = p_start = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_SETUP_CONNECTION_REQUEST_MSG);
UINT8_TO_BE_STREAM(p, p_bcb->dst_uuid.len);
if (p_bcb->dst_uuid.len == 2) {
UINT16_TO_BE_STREAM(p, p_bcb->dst_uuid.uu.uuid16);
UINT16_TO_BE_STREAM(p, p_bcb->src_uuid.uu.uuid16);
} else if (p_bcb->dst_uuid.len == 4) {
UINT32_TO_BE_STREAM(p, p_bcb->dst_uuid.uu.uuid32);
UINT32_TO_BE_STREAM(p, p_bcb->src_uuid.uu.uuid32);
} else if (p_bcb->dst_uuid.len == 16) {
memcpy(p, p_bcb->dst_uuid.uu.uuid128, p_bcb->dst_uuid.len);
p += p_bcb->dst_uuid.len;
memcpy(p, p_bcb->src_uuid.uu.uuid128, p_bcb->dst_uuid.len);
p += p_bcb->dst_uuid.len;
} else {
BNEP_TRACE_ERROR("%s: uuid: %x, invalid length: %x", __func__,
p_bcb->dst_uuid.uu.uuid16, p_bcb->dst_uuid.len);
}
p_buf->len = (uint16_t)(p - p_start);
bnepu_check_send_packet(p_bcb, p_buf);
}
/*******************************************************************************
*
* Function bnep_send_conn_responce
*
* Description This function sends a BNEP setup response to peer
*
* Returns void
*
******************************************************************************/
void bnep_send_conn_responce(tBNEP_CONN* p_bcb, uint16_t resp_code) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t* p;
BNEP_TRACE_EVENT("BNEP - bnep_send_conn_responce for CID: 0x%x",
p_bcb->l2cap_cid);
p_buf->offset = L2CAP_MIN_OFFSET;
p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_SETUP_CONNECTION_RESPONSE_MSG);
UINT16_TO_BE_STREAM(p, resp_code);
p_buf->len = 4;
bnepu_check_send_packet(p_bcb, p_buf);
}
/*******************************************************************************
*
* Function bnepu_send_peer_our_filters
*
* Description This function sends our filters to a peer
*
* Returns void
*
******************************************************************************/
void bnepu_send_peer_our_filters(tBNEP_CONN* p_bcb) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t* p;
uint16_t xx;
BNEP_TRACE_DEBUG("BNEP sending peer our filters");
p_buf->offset = L2CAP_MIN_OFFSET;
p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_FILTER_NET_TYPE_SET_MSG);
UINT16_TO_BE_STREAM(p, (4 * p_bcb->sent_num_filters));
for (xx = 0; xx < p_bcb->sent_num_filters; xx++) {
UINT16_TO_BE_STREAM(p, p_bcb->sent_prot_filter_start[xx]);
UINT16_TO_BE_STREAM(p, p_bcb->sent_prot_filter_end[xx]);
}
p_buf->len = 4 + (4 * p_bcb->sent_num_filters);
bnepu_check_send_packet(p_bcb, p_buf);
p_bcb->con_flags |= BNEP_FLAGS_FILTER_RESP_PEND;
/* Start timer waiting for setup response */
alarm_set_on_mloop(p_bcb->conn_timer, BNEP_FILTER_SET_TIMEOUT_MS,
bnep_conn_timer_timeout, p_bcb);
}
/*******************************************************************************
*
* Function bnepu_send_peer_our_multi_filters
*
* Description This function sends our multicast filters to a peer
*
* Returns void
*
******************************************************************************/
void bnepu_send_peer_our_multi_filters(tBNEP_CONN* p_bcb) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t* p;
uint16_t xx;
BNEP_TRACE_DEBUG("BNEP sending peer our multicast filters");
p_buf->offset = L2CAP_MIN_OFFSET;
p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_FILTER_MULTI_ADDR_SET_MSG);
UINT16_TO_BE_STREAM(p, (2 * BD_ADDR_LEN * p_bcb->sent_mcast_filters));
for (xx = 0; xx < p_bcb->sent_mcast_filters; xx++) {
memcpy(p, p_bcb->sent_mcast_filter_start[xx].address, BD_ADDR_LEN);
p += BD_ADDR_LEN;
memcpy(p, p_bcb->sent_mcast_filter_end[xx].address, BD_ADDR_LEN);
p += BD_ADDR_LEN;
}
p_buf->len = 4 + (2 * BD_ADDR_LEN * p_bcb->sent_mcast_filters);
bnepu_check_send_packet(p_bcb, p_buf);
p_bcb->con_flags |= BNEP_FLAGS_MULTI_RESP_PEND;
/* Start timer waiting for setup response */
alarm_set_on_mloop(p_bcb->conn_timer, BNEP_FILTER_SET_TIMEOUT_MS,
bnep_conn_timer_timeout, p_bcb);
}
/*******************************************************************************
*
* Function bnepu_send_peer_filter_rsp
*
* Description This function sends a filter response to a peer
*
* Returns void
*
******************************************************************************/
void bnepu_send_peer_filter_rsp(tBNEP_CONN* p_bcb, uint16_t response_code) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t* p;
BNEP_TRACE_DEBUG("BNEP sending filter response");
p_buf->offset = L2CAP_MIN_OFFSET;
p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_FILTER_NET_TYPE_RESPONSE_MSG);
UINT16_TO_BE_STREAM(p, response_code);
p_buf->len = 4;
bnepu_check_send_packet(p_bcb, p_buf);
}
/*******************************************************************************
*
* Function bnep_send_command_not_understood
*
* Description This function sends a BNEP command not understood message
*
* Returns void
*
******************************************************************************/
void bnep_send_command_not_understood(tBNEP_CONN* p_bcb, uint8_t cmd_code) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t* p;
BNEP_TRACE_EVENT(
"BNEP - bnep_send_command_not_understood for CID: 0x%x, cmd 0x%x",
p_bcb->l2cap_cid, cmd_code);
p_buf->offset = L2CAP_MIN_OFFSET;
p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_CONTROL_COMMAND_NOT_UNDERSTOOD);
UINT8_TO_BE_STREAM(p, cmd_code);
p_buf->len = 3;
bnepu_check_send_packet(p_bcb, p_buf);
}
/*******************************************************************************
*
* Function bnepu_check_send_packet
*
* Description This function tries to send a packet to L2CAP.
* If L2CAP is flow controlled, it enqueues the
* packet to the transmit queue
*
* Returns void
*
******************************************************************************/
void bnepu_check_send_packet(tBNEP_CONN* p_bcb, BT_HDR* p_buf) {
BNEP_TRACE_EVENT("BNEP - bnepu_check_send_packet for CID: 0x%x",
p_bcb->l2cap_cid);
if (p_bcb->con_flags & BNEP_FLAGS_L2CAP_CONGESTED) {
if (fixed_queue_length(p_bcb->xmit_q) >= BNEP_MAX_XMITQ_DEPTH) {
BNEP_TRACE_EVENT("BNEP - congested, dropping buf, CID: 0x%x",
p_bcb->l2cap_cid);
osi_free(p_buf);
} else {
fixed_queue_enqueue(p_bcb->xmit_q, p_buf);
}
} else {
L2CA_DataWrite(p_bcb->l2cap_cid, p_buf);
}
}
/*******************************************************************************
*
* Function bnepu_build_bnep_hdr
*
* Description This function builds the BNEP header for a packet
* Extension headers are not sent yet, so there is no
* check for that.
*
* Returns void
*
******************************************************************************/
void bnepu_build_bnep_hdr(tBNEP_CONN* p_bcb, BT_HDR* p_buf, uint16_t protocol,
const RawAddress* p_src_addr,
const RawAddress* p_dest_addr, bool fw_ext_present) {
const controller_t* controller = controller_get_interface();
uint8_t ext_bit, *p = (uint8_t*)NULL;
uint8_t type = BNEP_FRAME_COMPRESSED_ETHERNET;
ext_bit = fw_ext_present ? 0x80 : 0x00;
if (p_src_addr && *p_src_addr != *controller->get_address())
type = BNEP_FRAME_COMPRESSED_ETHERNET_SRC_ONLY;
if (*p_dest_addr != p_bcb->rem_bda)
type = (type == BNEP_FRAME_COMPRESSED_ETHERNET)
? BNEP_FRAME_COMPRESSED_ETHERNET_DEST_ONLY
: BNEP_FRAME_GENERAL_ETHERNET;
if (!p_src_addr) p_src_addr = controller->get_address();
switch (type) {
case BNEP_FRAME_GENERAL_ETHERNET:
p = bnepu_init_hdr(p_buf, 15,
(uint8_t)(ext_bit | BNEP_FRAME_GENERAL_ETHERNET));
memcpy(p, p_dest_addr->address, BD_ADDR_LEN);
p += BD_ADDR_LEN;
memcpy(p, p_src_addr->address, BD_ADDR_LEN);
p += BD_ADDR_LEN;
break;
case BNEP_FRAME_COMPRESSED_ETHERNET:
p = bnepu_init_hdr(p_buf, 3,
(uint8_t)(ext_bit | BNEP_FRAME_COMPRESSED_ETHERNET));
break;
case BNEP_FRAME_COMPRESSED_ETHERNET_SRC_ONLY:
p = bnepu_init_hdr(
p_buf, 9,
(uint8_t)(ext_bit | BNEP_FRAME_COMPRESSED_ETHERNET_SRC_ONLY));
memcpy(p, p_src_addr->address, BD_ADDR_LEN);
p += BD_ADDR_LEN;
break;
case BNEP_FRAME_COMPRESSED_ETHERNET_DEST_ONLY:
p = bnepu_init_hdr(
p_buf, 9,
(uint8_t)(ext_bit | BNEP_FRAME_COMPRESSED_ETHERNET_DEST_ONLY));
memcpy(p, p_dest_addr->address, BD_ADDR_LEN);
p += BD_ADDR_LEN;
break;
}
UINT16_TO_BE_STREAM(p, protocol);
}
/*******************************************************************************
*
* Function bnepu_init_hdr
*
* Description This function initializes the BNEP header
*
* Returns pointer to header in buffer
*
******************************************************************************/
static uint8_t* bnepu_init_hdr(BT_HDR* p_buf, uint16_t hdr_len,
uint8_t pkt_type) {
uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
/* See if we need to make space in the buffer */
if (p_buf->offset < (hdr_len + L2CAP_MIN_OFFSET)) {
uint16_t xx, diff = BNEP_MINIMUM_OFFSET - p_buf->offset;
p = p + p_buf->len - 1;
for (xx = 0; xx < p_buf->len; xx++, p--) p[diff] = *p;
p_buf->offset = BNEP_MINIMUM_OFFSET;
p = (uint8_t*)(p_buf + 1) + p_buf->offset;
}
p_buf->len += hdr_len;
p_buf->offset -= hdr_len;
p -= hdr_len;
*p++ = pkt_type;
return (p);
}
/*******************************************************************************
*
* Function bnep_process_setup_conn_req
*
* Description This function processes a peer's setup connection request
* message. The destination UUID is verified and response sent
* Connection open indication will be given to PAN profile
*
* Returns void
*
******************************************************************************/
void bnep_process_setup_conn_req(tBNEP_CONN* p_bcb, uint8_t* p_setup,
uint8_t len) {
BNEP_TRACE_EVENT("BNEP - bnep_process_setup_conn_req for CID: 0x%x",
p_bcb->l2cap_cid);
if (p_bcb->con_state != BNEP_STATE_CONN_SETUP &&
p_bcb->con_state != BNEP_STATE_SEC_CHECKING &&
p_bcb->con_state != BNEP_STATE_CONNECTED) {
BNEP_TRACE_ERROR("BNEP - setup request in bad state %d", p_bcb->con_state);
bnep_send_conn_responce(p_bcb, BNEP_SETUP_CONN_NOT_ALLOWED);
return;
}
/* Check if we already initiated security check or if waiting for user
* responce */
if (p_bcb->con_flags & BNEP_FLAGS_SETUP_RCVD) {
BNEP_TRACE_EVENT(
"BNEP - Duplicate Setup message received while doing security check");
return;
}
/* Check if peer is the originator */
if (p_bcb->con_state != BNEP_STATE_CONNECTED &&
(!(p_bcb->con_flags & BNEP_FLAGS_SETUP_RCVD)) &&
(p_bcb->con_flags & BNEP_FLAGS_IS_ORIG)) {
BNEP_TRACE_ERROR("BNEP - setup request when we are originator",
p_bcb->con_state);
bnep_send_conn_responce(p_bcb, BNEP_SETUP_CONN_NOT_ALLOWED);
return;
}
if (p_bcb->con_state == BNEP_STATE_CONNECTED) {
memcpy((uint8_t*)&(p_bcb->prv_src_uuid), (uint8_t*)&(p_bcb->src_uuid),
sizeof(tBT_UUID));
memcpy((uint8_t*)&(p_bcb->prv_dst_uuid), (uint8_t*)&(p_bcb->dst_uuid),
sizeof(tBT_UUID));
}
p_bcb->dst_uuid.len = p_bcb->src_uuid.len = len;
if (p_bcb->dst_uuid.len == 2) {
/* because peer initiated connection keep src uuid as dst uuid */
BE_STREAM_TO_UINT16(p_bcb->src_uuid.uu.uuid16, p_setup);
BE_STREAM_TO_UINT16(p_bcb->dst_uuid.uu.uuid16, p_setup);
/* If nothing has changed don't bother the profile */
if (p_bcb->con_state == BNEP_STATE_CONNECTED &&
p_bcb->src_uuid.uu.uuid16 == p_bcb->prv_src_uuid.uu.uuid16 &&
p_bcb->dst_uuid.uu.uuid16 == p_bcb->prv_dst_uuid.uu.uuid16) {
bnep_send_conn_responce(p_bcb, BNEP_SETUP_CONN_OK);
return;
}
} else if (p_bcb->dst_uuid.len == 4) {
BE_STREAM_TO_UINT32(p_bcb->src_uuid.uu.uuid32, p_setup);
BE_STREAM_TO_UINT32(p_bcb->dst_uuid.uu.uuid32, p_setup);
} else if (p_bcb->dst_uuid.len == 16) {
memcpy(p_bcb->src_uuid.uu.uuid128, p_setup, p_bcb->src_uuid.len);
p_setup += p_bcb->src_uuid.len;
memcpy(p_bcb->dst_uuid.uu.uuid128, p_setup, p_bcb->dst_uuid.len);
p_setup += p_bcb->dst_uuid.len;
} else {
BNEP_TRACE_ERROR("BNEP - Bad UID len %d in ConnReq", p_bcb->dst_uuid.len);
bnep_send_conn_responce(p_bcb, BNEP_SETUP_INVALID_UUID_SIZE);
return;
}
p_bcb->con_state = BNEP_STATE_SEC_CHECKING;
p_bcb->con_flags |= BNEP_FLAGS_SETUP_RCVD;
BNEP_TRACE_EVENT(
"BNEP initiating security check for incoming call for uuid 0x%x",
p_bcb->src_uuid.uu.uuid16);
#if (BNEP_DO_AUTH_FOR_ROLE_SWITCH == FALSE)
if (p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED)
bnep_sec_check_complete(p_bcb->rem_bda, p_bcb, BTM_SUCCESS);
else
#endif
btm_sec_mx_access_request(
p_bcb->rem_bda, BT_PSM_BNEP, false, BTM_SEC_PROTO_BNEP,
bnep_get_uuid32(&(p_bcb->src_uuid)), &bnep_sec_check_complete, p_bcb);
return;
}
/*******************************************************************************
*
* Function bnep_process_setup_conn_responce
*
* Description This function processes a peer's setup connection response
* message. The response code is verified and
* Connection open indication will be given to PAN profile
*
* Returns void
*
******************************************************************************/
void bnep_process_setup_conn_responce(tBNEP_CONN* p_bcb, uint8_t* p_setup) {
tBNEP_RESULT resp;
uint16_t resp_code;
BNEP_TRACE_DEBUG("BNEP received setup responce");
/* The state should be either SETUP or CONNECTED */
if (p_bcb->con_state != BNEP_STATE_CONN_SETUP) {
/* Should we disconnect ? */
BNEP_TRACE_ERROR("BNEP - setup response in bad state %d", p_bcb->con_state);
return;
}
/* Check if we are the originator */
if (!(p_bcb->con_flags & BNEP_FLAGS_IS_ORIG)) {
BNEP_TRACE_ERROR("BNEP - setup response when we are not originator",
p_bcb->con_state);
return;
}
BE_STREAM_TO_UINT16(resp_code, p_setup);
switch (resp_code) {
case BNEP_SETUP_INVALID_SRC_UUID:
resp = BNEP_CONN_FAILED_SRC_UUID;
break;
case BNEP_SETUP_INVALID_DEST_UUID:
resp = BNEP_CONN_FAILED_DST_UUID;
break;
case BNEP_SETUP_INVALID_UUID_SIZE:
resp = BNEP_CONN_FAILED_UUID_SIZE;
break;
case BNEP_SETUP_CONN_NOT_ALLOWED:
default:
resp = BNEP_CONN_FAILED;
break;
}
/* Check the responce code */
if (resp_code != BNEP_SETUP_CONN_OK) {
if (p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED) {
BNEP_TRACE_EVENT("BNEP - role change response is %d", resp_code);
/* Restore the earlier BNEP status */
p_bcb->con_state = BNEP_STATE_CONNECTED;
p_bcb->con_flags &= (~BNEP_FLAGS_SETUP_RCVD);
memcpy((uint8_t*)&(p_bcb->src_uuid), (uint8_t*)&(p_bcb->prv_src_uuid),
sizeof(tBT_UUID));
memcpy((uint8_t*)&(p_bcb->dst_uuid), (uint8_t*)&(p_bcb->prv_dst_uuid),
sizeof(tBT_UUID));
/* Ensure timer is stopped */
alarm_cancel(p_bcb->conn_timer);
p_bcb->re_transmits = 0;
/* Tell the user if he has a callback */
if (bnep_cb.p_conn_state_cb)
(*bnep_cb.p_conn_state_cb)(p_bcb->handle, p_bcb->rem_bda, resp, true);
return;
} else {
BNEP_TRACE_ERROR("BNEP - setup response %d is not OK", resp_code);
L2CA_DisconnectReq(p_bcb->l2cap_cid);
/* Tell the user if he has a callback */
if ((p_bcb->con_flags & BNEP_FLAGS_IS_ORIG) && (bnep_cb.p_conn_state_cb))
(*bnep_cb.p_conn_state_cb)(p_bcb->handle, p_bcb->rem_bda, resp, false);
bnepu_release_bcb(p_bcb);
return;
}
}
/* Received successful responce */
bnep_connected(p_bcb);
}
/*******************************************************************************
*
* Function bnep_process_control_packet
*
* Description This function processes a peer's setup connection request
* message. The destination UUID is verified and response sent
* Connection open indication will be given to PAN profile
*
* Returns void
*
******************************************************************************/
uint8_t* bnep_process_control_packet(tBNEP_CONN* p_bcb, uint8_t* p,
uint16_t* rem_len, bool is_ext) {
uint8_t control_type;
uint16_t len, ext_len = 0;
if (p == NULL || rem_len == NULL) {
if (rem_len != NULL) *rem_len = 0;
BNEP_TRACE_DEBUG("%s: invalid packet: p = %p rem_len = %p", __func__, p,
rem_len);
return NULL;
}
uint16_t rem_len_orig = *rem_len;
if (is_ext) {
if (*rem_len < 1) goto bad_packet_length;
ext_len = *p++;
*rem_len = *rem_len - 1;
}
if (*rem_len < 1) goto bad_packet_length;
control_type = *p++;
*rem_len = *rem_len - 1;
BNEP_TRACE_EVENT(
"%s: BNEP processing control packet rem_len %d, is_ext %d, ctrl_type %d",
__func__, *rem_len, is_ext, control_type);
switch (control_type) {
case BNEP_CONTROL_COMMAND_NOT_UNDERSTOOD:
if (*rem_len < 1) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_CONTROL_COMMAND_NOT_UNDERSTOOD with bad length",
__func__);
goto bad_packet_length;
}
BNEP_TRACE_ERROR(
"%s: Received BNEP_CONTROL_COMMAND_NOT_UNDERSTOOD for pkt type: %d",
__func__, *p);
p++;
*rem_len = *rem_len - 1;
break;
case BNEP_SETUP_CONNECTION_REQUEST_MSG:
if (*rem_len < 1) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_SETUP_CONNECTION_REQUEST_MSG with bad length",
__func__);
android_errorWriteLog(0x534e4554, "69177292");
goto bad_packet_length;
}
len = *p++;
if (*rem_len < ((2 * len) + 1)) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_SETUP_CONNECTION_REQUEST_MSG with bad length",
__func__);
goto bad_packet_length;
}
if (!is_ext) bnep_process_setup_conn_req(p_bcb, p, (uint8_t)len);
p += (2 * len);
*rem_len = *rem_len - (2 * len) - 1;
break;
case BNEP_SETUP_CONNECTION_RESPONSE_MSG:
if (*rem_len < 2) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_SETUP_CONNECTION_RESPONSE_MSG with bad length",
__func__);
goto bad_packet_length;
}
if (!is_ext) bnep_process_setup_conn_responce(p_bcb, p);
p += 2;
*rem_len = *rem_len - 2;
break;
case BNEP_FILTER_NET_TYPE_SET_MSG:
if (*rem_len < 2) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_FILTER_NET_TYPE_SET_MSG with bad length",
__func__);
android_errorWriteLog(0x534e4554, "69177292");
goto bad_packet_length;
}
BE_STREAM_TO_UINT16(len, p);
if (*rem_len < (len + 2)) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_FILTER_NET_TYPE_SET_MSG with bad length",
__func__);
goto bad_packet_length;
}
bnepu_process_peer_filter_set(p_bcb, p, len);
p += len;
*rem_len = *rem_len - len - 2;
break;
case BNEP_FILTER_NET_TYPE_RESPONSE_MSG:
if (*rem_len < 2) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_FILTER_NET_TYPE_RESPONSE_MSG with bad length",
__func__);
goto bad_packet_length;
}
bnepu_process_peer_filter_rsp(p_bcb, p);
p += 2;
*rem_len = *rem_len - 2;
break;
case BNEP_FILTER_MULTI_ADDR_SET_MSG:
if (*rem_len < 2) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_FILTER_MULTI_ADDR_SET_MSG with bad length",
__func__);
android_errorWriteLog(0x534e4554, "69177292");
goto bad_packet_length;
}
BE_STREAM_TO_UINT16(len, p);
if (*rem_len < (len + 2)) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_FILTER_MULTI_ADDR_SET_MSG with bad length",
__func__);
goto bad_packet_length;
}
bnepu_process_peer_multicast_filter_set(p_bcb, p, len);
p += len;
*rem_len = *rem_len - len - 2;
break;
case BNEP_FILTER_MULTI_ADDR_RESPONSE_MSG:
if (*rem_len < 2) {
BNEP_TRACE_ERROR(
"%s: Received BNEP_FILTER_MULTI_ADDR_RESPONSE_MSG with bad length",
__func__);
goto bad_packet_length;
}
bnepu_process_multicast_filter_rsp(p_bcb, p);
p += 2;
*rem_len = *rem_len - 2;
break;
default:
BNEP_TRACE_ERROR("%s: BNEP - bad ctl pkt type: %d", __func__,
control_type);
bnep_send_command_not_understood(p_bcb, control_type);
if (is_ext && (ext_len > 0)) {
if (*rem_len < (ext_len - 1)) {
goto bad_packet_length;
}
p += (ext_len - 1);
*rem_len -= (ext_len - 1);
}
break;
}
return p;
bad_packet_length:
BNEP_TRACE_ERROR("%s: bad control packet length: original=%d remaining=%d",
__func__, rem_len_orig, *rem_len);
*rem_len = 0;
return NULL;
}
/*******************************************************************************
*
* Function bnepu_process_peer_filter_set
*
* Description This function processes a peer's filter control
* 'set' message. The filters are stored in the BCB,
* and an appropriate filter response message sent.
*
* Returns void
*
******************************************************************************/
void bnepu_process_peer_filter_set(tBNEP_CONN* p_bcb, uint8_t* p_filters,
uint16_t len) {
uint16_t num_filters = 0;
uint16_t xx, resp_code = BNEP_FILTER_CRL_OK;
uint16_t start, end;
uint8_t* p_temp_filters;
if ((p_bcb->con_state != BNEP_STATE_CONNECTED) &&
(!(p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED))) {
BNEP_TRACE_DEBUG(
"BNEP received filter set from peer when there is no connection");
return;
}
BNEP_TRACE_DEBUG("BNEP received filter set from peer");
/* Check for length not a multiple of 4 */
if (len & 3) {
BNEP_TRACE_EVENT("BNEP - bad filter len: %d", len);
bnepu_send_peer_filter_rsp(p_bcb, BNEP_FILTER_CRL_BAD_RANGE);
return;
}
if (len) num_filters = (uint16_t)(len >> 2);
/* Validate filter values */
if (num_filters <= BNEP_MAX_PROT_FILTERS) {
p_temp_filters = p_filters;
for (xx = 0; xx < num_filters; xx++) {
BE_STREAM_TO_UINT16(start, p_temp_filters);
BE_STREAM_TO_UINT16(end, p_temp_filters);
if (start > end) {
resp_code = BNEP_FILTER_CRL_BAD_RANGE;
break;
}
}
} else
resp_code = BNEP_FILTER_CRL_MAX_REACHED;
if (resp_code != BNEP_FILTER_CRL_OK) {
bnepu_send_peer_filter_rsp(p_bcb, resp_code);
return;
}
if (bnep_cb.p_filter_ind_cb)
(*bnep_cb.p_filter_ind_cb)(p_bcb->handle, true, 0, len, p_filters);
p_bcb->rcvd_num_filters = num_filters;
for (xx = 0; xx < num_filters; xx++) {
BE_STREAM_TO_UINT16(start, p_filters);
BE_STREAM_TO_UINT16(end, p_filters);
p_bcb->rcvd_prot_filter_start[xx] = start;
p_bcb->rcvd_prot_filter_end[xx] = end;
}
bnepu_send_peer_filter_rsp(p_bcb, resp_code);
}
/*******************************************************************************
*
* Function bnepu_process_peer_filter_rsp
*
* Description This function processes a peer's filter control
* 'response' message.
*
* Returns void
*
******************************************************************************/
void bnepu_process_peer_filter_rsp(tBNEP_CONN* p_bcb, uint8_t* p_data) {
uint16_t resp_code;
tBNEP_RESULT result;
BNEP_TRACE_DEBUG("BNEP received filter responce");
/* The state should be CONNECTED */
if ((p_bcb->con_state != BNEP_STATE_CONNECTED) &&
(!(p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED))) {
BNEP_TRACE_ERROR("BNEP - filter response in bad state %d",
p_bcb->con_state);
return;
}
/* Check if we are the originator */
if (!(p_bcb->con_flags & BNEP_FLAGS_FILTER_RESP_PEND)) {
BNEP_TRACE_ERROR("BNEP - filter response when not expecting");
return;
}
/* Ensure timer is stopped */
alarm_cancel(p_bcb->conn_timer);
p_bcb->con_flags &= ~BNEP_FLAGS_FILTER_RESP_PEND;
p_bcb->re_transmits = 0;
BE_STREAM_TO_UINT16(resp_code, p_data);
result = BNEP_SUCCESS;
if (resp_code != BNEP_FILTER_CRL_OK) result = BNEP_SET_FILTER_FAIL;
if (bnep_cb.p_filter_ind_cb)
(*bnep_cb.p_filter_ind_cb)(p_bcb->handle, false, result, 0, NULL);
}
/*******************************************************************************
*
* Function bnepu_process_multicast_filter_rsp
*
* Description This function processes multicast filter control
* 'response' message.
*
* Returns void
*
******************************************************************************/
void bnepu_process_multicast_filter_rsp(tBNEP_CONN* p_bcb, uint8_t* p_data) {
uint16_t resp_code;
tBNEP_RESULT result;
BNEP_TRACE_DEBUG("BNEP received multicast filter responce");
/* The state should be CONNECTED */
if ((p_bcb->con_state != BNEP_STATE_CONNECTED) &&
(!(p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED))) {
BNEP_TRACE_ERROR("BNEP - multicast filter response in bad state %d",
p_bcb->con_state);
return;
}
/* Check if we are the originator */
if (!(p_bcb->con_flags & BNEP_FLAGS_MULTI_RESP_PEND)) {
BNEP_TRACE_ERROR("BNEP - multicast filter response when not expecting");
return;
}
/* Ensure timer is stopped */
alarm_cancel(p_bcb->conn_timer);
p_bcb->con_flags &= ~BNEP_FLAGS_MULTI_RESP_PEND;
p_bcb->re_transmits = 0;
BE_STREAM_TO_UINT16(resp_code, p_data);
result = BNEP_SUCCESS;
if (resp_code != BNEP_FILTER_CRL_OK) result = BNEP_SET_FILTER_FAIL;
if (bnep_cb.p_mfilter_ind_cb)
(*bnep_cb.p_mfilter_ind_cb)(p_bcb->handle, false, result, 0, NULL);
}
/*******************************************************************************
*
* Function bnepu_process_peer_multicast_filter_set
*
* Description This function processes a peer's filter control
* 'set' message. The filters are stored in the BCB,
* and an appropriate filter response message sent.
*
* Returns void
*
******************************************************************************/
void bnepu_process_peer_multicast_filter_set(tBNEP_CONN* p_bcb,
uint8_t* p_filters, uint16_t len) {
uint16_t resp_code = BNEP_FILTER_CRL_OK;
uint16_t num_filters, xx;
uint8_t *p_temp_filters, null_bda[BD_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
if ((p_bcb->con_state != BNEP_STATE_CONNECTED) &&
(!(p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED))) {
BNEP_TRACE_DEBUG(
"BNEP received multicast filter set from peer when there is no "
"connection");
return;
}
if (len % 12) {
BNEP_TRACE_EVENT("BNEP - bad filter len: %d", len);
bnepu_send_peer_multicast_filter_rsp(p_bcb, BNEP_FILTER_CRL_BAD_RANGE);
return;
}
if (len > (BNEP_MAX_MULTI_FILTERS * 2 * BD_ADDR_LEN)) {
BNEP_TRACE_EVENT("BNEP - Too many filters");
bnepu_send_peer_multicast_filter_rsp(p_bcb, BNEP_FILTER_CRL_MAX_REACHED);
return;
}
num_filters = 0;
if (len) num_filters = (uint16_t)(len / 12);
/* Validate filter values */
if (num_filters <= BNEP_MAX_MULTI_FILTERS) {
p_temp_filters = p_filters;
for (xx = 0; xx < num_filters; xx++) {
if (memcmp(p_temp_filters, p_temp_filters + BD_ADDR_LEN, BD_ADDR_LEN) >
0) {
bnepu_send_peer_multicast_filter_rsp(p_bcb, BNEP_FILTER_CRL_BAD_RANGE);
return;
}
p_temp_filters += (BD_ADDR_LEN * 2);
}
}
p_bcb->rcvd_mcast_filters = num_filters;
for (xx = 0; xx < num_filters; xx++) {
memcpy(p_bcb->rcvd_mcast_filter_start[xx].address, p_filters, BD_ADDR_LEN);
memcpy(p_bcb->rcvd_mcast_filter_end[xx].address, p_filters + BD_ADDR_LEN,
BD_ADDR_LEN);
p_filters += (BD_ADDR_LEN * 2);
/* Check if any of the ranges have all zeros as both starting and ending
* addresses */
if ((memcmp(null_bda, p_bcb->rcvd_mcast_filter_start[xx].address,
BD_ADDR_LEN) == 0) &&
(memcmp(null_bda, p_bcb->rcvd_mcast_filter_end[xx].address,
BD_ADDR_LEN) == 0)) {
p_bcb->rcvd_mcast_filters = 0xFFFF;
break;
}
}
BNEP_TRACE_EVENT("BNEP multicast filters %d", p_bcb->rcvd_mcast_filters);
bnepu_send_peer_multicast_filter_rsp(p_bcb, resp_code);
if (bnep_cb.p_mfilter_ind_cb)
(*bnep_cb.p_mfilter_ind_cb)(p_bcb->handle, true, 0, len, p_filters);
}
/*******************************************************************************
*
* Function bnepu_send_peer_multicast_filter_rsp
*
* Description This function sends a filter response to a peer
*
* Returns void
*
******************************************************************************/
void bnepu_send_peer_multicast_filter_rsp(tBNEP_CONN* p_bcb,
uint16_t response_code) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BNEP_BUF_SIZE);
uint8_t* p;
BNEP_TRACE_DEBUG("BNEP sending multicast filter response %d", response_code);
p_buf->offset = L2CAP_MIN_OFFSET;
p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Put in BNEP frame type - filter control */
UINT8_TO_BE_STREAM(p, BNEP_FRAME_CONTROL);
/* Put in filter message type - set filters */
UINT8_TO_BE_STREAM(p, BNEP_FILTER_MULTI_ADDR_RESPONSE_MSG);
UINT16_TO_BE_STREAM(p, response_code);
p_buf->len = 4;
bnepu_check_send_packet(p_bcb, p_buf);
}
/*******************************************************************************
*
* Function bnep_sec_check_complete
*
* Description This function is registered with BTM and will be called
* after completing the security procedures
*
* Returns void
*
******************************************************************************/
void bnep_sec_check_complete(UNUSED_ATTR const RawAddress* bd_addr,
UNUSED_ATTR tBT_TRANSPORT trasnport,
void* p_ref_data, uint8_t result) {
tBNEP_CONN* p_bcb = (tBNEP_CONN*)p_ref_data;
uint16_t resp_code = BNEP_SETUP_CONN_OK;
bool is_role_change;
BNEP_TRACE_EVENT("BNEP security callback returned result %d", result);
if (p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED)
is_role_change = true;
else
is_role_change = false;
/* check if the port is still waiting for security to complete */
if (p_bcb->con_state != BNEP_STATE_SEC_CHECKING) {
BNEP_TRACE_ERROR(
"BNEP Connection in wrong state %d when security is completed",
p_bcb->con_state);
return;
}
/* if it is outgoing call and result is FAILURE return security fail error */
if (!(p_bcb->con_flags & BNEP_FLAGS_SETUP_RCVD)) {
if (result != BTM_SUCCESS) {
if (p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED) {
/* Tell the user that role change is failed because of security */
if (bnep_cb.p_conn_state_cb)
(*bnep_cb.p_conn_state_cb)(p_bcb->handle, p_bcb->rem_bda,
BNEP_SECURITY_FAIL, is_role_change);
p_bcb->con_state = BNEP_STATE_CONNECTED;
memcpy((uint8_t*)&(p_bcb->src_uuid), (uint8_t*)&(p_bcb->prv_src_uuid),
sizeof(tBT_UUID));
memcpy((uint8_t*)&(p_bcb->dst_uuid), (uint8_t*)&(p_bcb->prv_dst_uuid),
sizeof(tBT_UUID));
return;
}
L2CA_DisconnectReq(p_bcb->l2cap_cid);
/* Tell the user if he has a callback */
if (bnep_cb.p_conn_state_cb)
(*bnep_cb.p_conn_state_cb)(p_bcb->handle, p_bcb->rem_bda,
BNEP_SECURITY_FAIL, is_role_change);
bnepu_release_bcb(p_bcb);
return;
}
/* Transition to the next appropriate state, waiting for connection confirm.
*/
p_bcb->con_state = BNEP_STATE_CONN_SETUP;
bnep_send_conn_req(p_bcb);
alarm_set_on_mloop(p_bcb->conn_timer, BNEP_CONN_TIMEOUT_MS,
bnep_conn_timer_timeout, p_bcb);
return;
}
/* it is an incoming call respond appropriately */
if (result != BTM_SUCCESS) {
bnep_send_conn_responce(p_bcb, BNEP_SETUP_CONN_NOT_ALLOWED);
if (p_bcb->con_flags & BNEP_FLAGS_CONN_COMPLETED) {
/* Role change is failed because of security. Revert back to connected
* state */
p_bcb->con_state = BNEP_STATE_CONNECTED;
p_bcb->con_flags &= (~BNEP_FLAGS_SETUP_RCVD);
memcpy((uint8_t*)&(p_bcb->src_uuid), (uint8_t*)&(p_bcb->prv_src_uuid),
sizeof(tBT_UUID));
memcpy((uint8_t*)&(p_bcb->dst_uuid), (uint8_t*)&(p_bcb->prv_dst_uuid),
sizeof(tBT_UUID));
return;
}
L2CA_DisconnectReq(p_bcb->l2cap_cid);
bnepu_release_bcb(p_bcb);
return;
}
if (bnep_cb.p_conn_ind_cb) {
p_bcb->con_state = BNEP_STATE_CONN_SETUP;
(*bnep_cb.p_conn_ind_cb)(p_bcb->handle, p_bcb->rem_bda, &p_bcb->dst_uuid,
&p_bcb->src_uuid, is_role_change);
} else {
/* Profile didn't register connection indication call back */
bnep_send_conn_responce(p_bcb, resp_code);
bnep_connected(p_bcb);
}
return;
}
/*******************************************************************************
*
* Function bnep_is_packet_allowed
*
* Description This function verifies whether the protocol passes through
* the protocol filters set by the peer
*
* Returns BNEP_SUCCESS - if the protocol is allowed
* BNEP_IGNORE_CMD - if the protocol is filtered out
*
******************************************************************************/
tBNEP_RESULT bnep_is_packet_allowed(tBNEP_CONN* p_bcb,
const RawAddress& p_dest_addr,
uint16_t protocol, bool fw_ext_present,
uint8_t* p_data) {
if (p_bcb->rcvd_num_filters) {
uint16_t i, proto;
/* Findout the actual protocol to check for the filtering */
proto = protocol;
if (proto == BNEP_802_1_P_PROTOCOL) {
if (fw_ext_present) {
uint8_t len, ext;
/* parse the extension headers and findout actual protocol */
do {
ext = *p_data++;
len = *p_data++;
p_data += len;
} while (ext & 0x80);
}
p_data += 2;
BE_STREAM_TO_UINT16(proto, p_data);
}
for (i = 0; i < p_bcb->rcvd_num_filters; i++) {
if ((p_bcb->rcvd_prot_filter_start[i] <= proto) &&
(proto <= p_bcb->rcvd_prot_filter_end[i]))
break;
}
if (i == p_bcb->rcvd_num_filters) {
BNEP_TRACE_DEBUG("Ignoring protocol 0x%x in BNEP data write", proto);
return BNEP_IGNORE_CMD;
}
}
/* Ckeck for multicast address filtering */
if ((p_dest_addr.address[0] & 0x01) && p_bcb->rcvd_mcast_filters) {
uint16_t i;
/* Check if every multicast should be filtered */
if (p_bcb->rcvd_mcast_filters != 0xFFFF) {
/* Check if the address is mentioned in the filter range */
for (i = 0; i < p_bcb->rcvd_mcast_filters; i++) {
if ((memcmp(p_bcb->rcvd_mcast_filter_start[i].address,
p_dest_addr.address, BD_ADDR_LEN) <= 0) &&
(memcmp(p_bcb->rcvd_mcast_filter_end[i].address,
p_dest_addr.address, BD_ADDR_LEN) >= 0))
break;
}
}
/*
** If every multicast should be filtered or the address is not in the filter
*range
** drop the packet
*/
if ((p_bcb->rcvd_mcast_filters == 0xFFFF) ||
(i == p_bcb->rcvd_mcast_filters)) {
VLOG(1) << "Ignoring multicast address " << p_dest_addr
<< " in BNEP data write";
return BNEP_IGNORE_CMD;
}
}
return BNEP_SUCCESS;
}
/*******************************************************************************
*
* Function bnep_get_uuid32
*
* Description This function returns the 32-bit equivalent of the UUID
*
* Returns uint32_t - 32-bit equivalent of the UUID
*
******************************************************************************/
uint32_t bnep_get_uuid32(tBT_UUID* src_uuid) {
uint32_t result;
if (src_uuid->len == 2)
return ((uint32_t)src_uuid->uu.uuid16);
else if (src_uuid->len == 4)
return (src_uuid->uu.uuid32 & 0x0000FFFF);
else {
result = src_uuid->uu.uuid128[2];
result = (result << 8) | (src_uuid->uu.uuid128[3]);
return result;
}
}