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l2c_utils.c
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l2c_utils.c
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/******************************************************************************
*
* Copyright (C) 1999-2012 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 L2CAP utility functions
*
******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include "osi/allocator.h"
#include "device/controller.h"
#include "stack/bt_types.h"
#include "stack/hcimsgs.h"
#include "stack/l2cdefs.h"
#include "l2c_int.h"
#include "stack/hcidefs.h"
#include "stack/btu.h"
#include "stack/btm_api.h"
#include "btm_int.h"
#include "stack/hcidefs.h"
#include "osi/allocator.h"
#include "osi/list.h"
/*******************************************************************************
**
** Function l2cu_allocate_lcb
**
** Description Look for an unused LCB
**
** Returns LCB address or NULL if none found
**
*******************************************************************************/
tL2C_LCB *l2cu_allocate_lcb (BD_ADDR p_bd_addr, BOOLEAN is_bonding, tBT_TRANSPORT transport)
{
tL2C_LCB *p_lcb = NULL;
bool list_ret = false;
extern tL2C_LCB *l2cu_find_free_lcb (void);
// temp solution
p_lcb = l2cu_find_free_lcb();
if(p_lcb != NULL) {
list_ret = true;
}
#if (CLASSIC_BT_INCLUDED == TRUE)
/* Check if peer device's and our BD_ADDR is same or not. It
should be different to avoid 'Impersonation in the Pin Pairing
Protocol' (CVE-2020-26555) vulnerability. */
if (memcmp((uint8_t *)p_bd_addr, (uint8_t *)&controller_get_interface()->get_address()->address, sizeof (BD_ADDR)) == 0) {
L2CAP_TRACE_ERROR ("%s connection rejected due to same BD ADDR", __func__);
return (NULL);
}
#endif
if(p_lcb == NULL && list_length(l2cb.p_lcb_pool) < MAX_L2CAP_LINKS) {
p_lcb = (tL2C_LCB *)osi_malloc(sizeof(tL2C_LCB));
if (p_lcb) {
memset (p_lcb, 0, sizeof(tL2C_LCB));
list_ret = list_append(l2cb.p_lcb_pool, p_lcb);
}else {
L2CAP_TRACE_ERROR("Error in allocating L2CAP Link Control Block");
}
}
if (list_ret) {
if (p_lcb) {
btu_free_timer(&p_lcb->timer_entry);
btu_free_timer(&p_lcb->info_timer_entry);
btu_free_timer(&p_lcb->upda_con_timer);
memset (p_lcb, 0, sizeof (tL2C_LCB));
memcpy (p_lcb->remote_bd_addr, p_bd_addr, BD_ADDR_LEN);
p_lcb->in_use = TRUE;
p_lcb->link_state = LST_DISCONNECTED;
p_lcb->handle = HCI_INVALID_HANDLE;
p_lcb->link_flush_tout = 0xFFFF;
p_lcb->timer_entry.param = (TIMER_PARAM_TYPE)p_lcb;
p_lcb->info_timer_entry.param = (TIMER_PARAM_TYPE)p_lcb;
p_lcb->upda_con_timer.param = (TIMER_PARAM_TYPE)p_lcb;
p_lcb->idle_timeout = l2cb.idle_timeout;
p_lcb->id = 1; /* spec does not allow '0' */
p_lcb->is_bonding = is_bonding;
#if (BLE_INCLUDED == TRUE)
p_lcb->transport = transport;
p_lcb->tx_data_len = controller_get_interface()->get_ble_default_data_packet_length();
p_lcb->le_sec_pending_q = fixed_queue_new(QUEUE_SIZE_MAX);
if (transport == BT_TRANSPORT_LE) {
l2cb.num_ble_links_active++;
l2c_ble_link_adjust_allocation();
} else
#endif
{
l2cb.num_links_active++;
l2c_link_adjust_allocation();
}
p_lcb->link_xmit_data_q = list_new(NULL);
return (p_lcb);
}
}
/* If here, no free LCB found */
return (NULL);
}
/*******************************************************************************
**
** Function l2cu_update_lcb_4_bonding
**
** Description Mark the lcb for bonding. Used when bonding takes place on
** an existing ACL connection. (Pre-Lisbon devices)
**
** Returns Nothing
**
*******************************************************************************/
void l2cu_update_lcb_4_bonding (BD_ADDR p_bd_addr, BOOLEAN is_bonding)
{
tL2C_LCB *p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR);
if (p_lcb) {
p_lcb->is_bonding = is_bonding;
}
}
/*******************************************************************************
**
** Function l2cu_release_lcb
**
** Description Release an LCB. All timers will be stopped, channels
** dropped, buffers returned etc.
**
** Returns void
**
*******************************************************************************/
void l2cu_release_lcb (tL2C_LCB *p_lcb)
{
tL2C_CCB *p_ccb;
p_lcb->in_use = FALSE;
p_lcb->is_bonding = FALSE;
#if (BLE_INCLUDED == TRUE)
p_lcb->retry_create_con = 0;
p_lcb->start_time_s = 0;
#endif // #if (BLE_INCLUDED == TRUE)
/* Stop and release timers */
btu_free_timer (&p_lcb->timer_entry);
memset(&p_lcb->timer_entry, 0, sizeof(TIMER_LIST_ENT));
btu_free_timer (&p_lcb->info_timer_entry);
memset(&p_lcb->info_timer_entry, 0, sizeof(TIMER_LIST_ENT));
btu_free_timer(&p_lcb->upda_con_timer);
memset(&p_lcb->upda_con_timer, 0, sizeof(TIMER_LIST_ENT));
/* Release any unfinished L2CAP packet on this link */
if (p_lcb->p_hcit_rcv_acl) {
osi_free(p_lcb->p_hcit_rcv_acl);
p_lcb->p_hcit_rcv_acl = NULL;
}
#if BTM_SCO_INCLUDED == TRUE
#if (BLE_INCLUDED == TRUE)
if (p_lcb->transport == BT_TRANSPORT_BR_EDR)
#endif
{
/* Release all SCO links */
btm_remove_sco_links(p_lcb->remote_bd_addr);
}
#endif
if (p_lcb->sent_not_acked > 0) {
#if (BLE_INCLUDED == TRUE)
if (p_lcb->transport == BT_TRANSPORT_LE) {
l2cb.controller_le_xmit_window += p_lcb->sent_not_acked;
if (l2cb.controller_le_xmit_window > l2cb.num_lm_ble_bufs) {
l2cb.controller_le_xmit_window = l2cb.num_lm_ble_bufs;
}
} else
#endif
{
l2cb.controller_xmit_window += p_lcb->sent_not_acked;
if (l2cb.controller_xmit_window > l2cb.num_lm_acl_bufs) {
l2cb.controller_xmit_window = l2cb.num_lm_acl_bufs;
}
}
}
#if (BLE_INCLUDED == TRUE)
// Reset BLE connecting flag only if the address matches
if (!memcmp(l2cb.ble_connecting_bda, p_lcb->remote_bd_addr, BD_ADDR_LEN)) {
l2cb.is_ble_connecting = FALSE;
}
#endif
#if (L2CAP_NUM_FIXED_CHNLS > 0)
l2cu_process_fixed_disc_cback(p_lcb);
#endif
/* Ensure no CCBs left on this LCB */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_lcb->ccb_queue.p_first_ccb) {
l2cu_release_ccb (p_ccb);
}
/* Tell BTM Acl management the link was removed */
if ((p_lcb->link_state == LST_CONNECTED) || (p_lcb->link_state == LST_DISCONNECTING)) {
#if (BLE_INCLUDED == TRUE)
btm_acl_removed (p_lcb->remote_bd_addr, p_lcb->transport);
#else
btm_acl_removed (p_lcb->remote_bd_addr, BT_TRANSPORT_BR_EDR);
#endif
}
/* Release any held buffers */
if (p_lcb->link_xmit_data_q) {
while (!list_is_empty(p_lcb->link_xmit_data_q)) {
BT_HDR *p_buf = list_front(p_lcb->link_xmit_data_q);
list_remove(p_lcb->link_xmit_data_q, p_buf);
osi_free(p_buf);
}
list_free(p_lcb->link_xmit_data_q);
p_lcb->link_xmit_data_q = NULL;
}
#if (L2CAP_UCD_INCLUDED == TRUE)
/* clean up any security pending UCD */
l2c_ucd_delete_sec_pending_q(p_lcb);
#endif
#if BLE_INCLUDED == TRUE
/* Re-adjust flow control windows make sure it does not go negative */
if (p_lcb->transport == BT_TRANSPORT_LE) {
if (l2cb.num_ble_links_active >= 1) {
l2cb.num_ble_links_active--;
}
l2c_ble_link_adjust_allocation();
} else
#endif
{
if (l2cb.num_links_active >= 1) {
l2cb.num_links_active--;
}
l2c_link_adjust_allocation();
}
/* Check for ping outstanding */
if (p_lcb->p_echo_rsp_cb) {
tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
/* Zero out the callback in case app immediately calls us again */
p_lcb->p_echo_rsp_cb = NULL;
(*p_cb) (L2CAP_PING_RESULT_NO_LINK);
}
#if (BLE_INCLUDED == TRUE)
/* Check and release all the LE COC connections waiting for security */
if (p_lcb->le_sec_pending_q)
{
while (!fixed_queue_is_empty(p_lcb->le_sec_pending_q))
{
tL2CAP_SEC_DATA *p_buf = (tL2CAP_SEC_DATA*) fixed_queue_dequeue(p_lcb->le_sec_pending_q, FIXED_QUEUE_MAX_TIMEOUT);
if (p_buf->p_callback) {
p_buf->p_callback(p_lcb->remote_bd_addr, p_lcb->transport, p_buf->p_ref_data, BTM_DEV_RESET);
}
osi_free(p_buf);
}
fixed_queue_free(p_lcb->le_sec_pending_q, NULL);
p_lcb->le_sec_pending_q = NULL;
}
#endif ///BLE_INCLUDED == TRUE
}
/*******************************************************************************
**
** Function l2cu_find_lcb_by_bd_addr
**
** Description Look through all active LCBs for a match based on the
** remote BD address.
**
** Returns pointer to matched LCB, or NULL if no match
**
*******************************************************************************/
tL2C_LCB *l2cu_find_lcb_by_bd_addr (BD_ADDR p_bd_addr, tBT_TRANSPORT transport)
{
list_node_t *p_node = NULL;
tL2C_LCB *p_lcb = NULL;
for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
p_lcb = list_node(p_node);
if ((p_lcb->in_use) &&
#if BLE_INCLUDED == TRUE
p_lcb->transport == transport &&
#endif
(!memcmp (p_lcb->remote_bd_addr, p_bd_addr, BD_ADDR_LEN))) {
return (p_lcb);
}
}
/* If here, no match found */
return (NULL);
}
tL2C_LCB *l2cu_find_free_lcb (void)
{
list_node_t *p_node = NULL;
tL2C_LCB *p_lcb = NULL;
for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
p_lcb = list_node(p_node);
if (!p_lcb->in_use) {
return (p_lcb);
}
}
/* If here, no match found */
return (NULL);
}
uint8_t l2cu_plcb_active_count(void)
{
list_node_t *p_node = NULL;
tL2C_LCB *p_lcb = NULL;
uint8_t active_count = 0;
for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
p_lcb = list_node(p_node);
if (p_lcb && p_lcb->in_use) {
active_count ++;
}
}
if (active_count >= MAX_L2CAP_CHANNELS) {
L2CAP_TRACE_ERROR("error active count");
active_count = 0;
}
L2CAP_TRACE_DEBUG("plcb active count %d", active_count);
return active_count;
}
/*******************************************************************************
**
** Function l2cu_get_conn_role
**
** Description Determine the desired role (master or slave) of a link.
** If already got a slave link, this one must be a master. If
** already got at least 1 link where we are the master, make this
** also a master.
**
** Returns HCI_ROLE_MASTER or HCI_ROLE_SLAVE
**
*******************************************************************************/
UINT8 l2cu_get_conn_role (tL2C_LCB *p_this_lcb)
{
return l2cb.desire_role;
}
/*******************************************************************************
**
** Function l2c_is_cmd_rejected
**
** Description Checks if cmd_code is command or response
** If a command it will be rejected per spec.
** This function is used when a illegal packet length is detected
**
** Returns BOOLEAN - TRUE if cmd_code is a command and it is rejected,
** FALSE if response code. (command not rejected)
**
*******************************************************************************/
BOOLEAN l2c_is_cmd_rejected (UINT8 cmd_code, UINT8 id, tL2C_LCB *p_lcb)
{
switch (cmd_code) {
case L2CAP_CMD_CONN_REQ:
case L2CAP_CMD_CONFIG_REQ:
case L2CAP_CMD_DISC_REQ:
case L2CAP_CMD_ECHO_REQ:
case L2CAP_CMD_INFO_REQ:
case L2CAP_CMD_AMP_CONN_REQ:
case L2CAP_CMD_AMP_MOVE_REQ:
case L2CAP_CMD_BLE_UPDATE_REQ:
l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_MTU_EXCEEDED, id, L2CAP_DEFAULT_MTU, 0);
L2CAP_TRACE_WARNING ("Dumping first Command (%d)", cmd_code);
return TRUE;
default: /* Otherwise a response */
return FALSE;
}
}
/*******************************************************************************
**
** Function l2cu_build_header
**
** Description Builds the L2CAP command packet header
**
** Returns Pointer to allocated packet or NULL if no resources
**
*******************************************************************************/
BT_HDR *l2cu_build_header (tL2C_LCB *p_lcb, UINT16 len, UINT8 cmd, UINT8 id)
{
BT_HDR *p_buf = (BT_HDR *)osi_malloc(L2CAP_CMD_BUF_SIZE);
UINT8 *p;
if (!p_buf) {
return (NULL);
}
p_buf->offset = L2CAP_SEND_CMD_OFFSET;
p_buf->len = len + HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET;
/* Put in HCI header - handle + pkt boundary */
#if (BLE_INCLUDED == TRUE)
if (p_lcb->transport == BT_TRANSPORT_LE) {
UINT16_TO_STREAM (p, (p_lcb->handle | (L2CAP_PKT_START_NON_FLUSHABLE << L2CAP_PKT_TYPE_SHIFT)));
} else
#endif
{
#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
UINT16_TO_STREAM (p, p_lcb->handle | l2cb.non_flushable_pbf);
#else
UINT16_TO_STREAM (p, (p_lcb->handle | (L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT)));
#endif
}
UINT16_TO_STREAM (p, len + L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD);
UINT16_TO_STREAM (p, len + L2CAP_CMD_OVERHEAD);
#if (BLE_INCLUDED == TRUE)
if (p_lcb->transport == BT_TRANSPORT_LE) {
//counter_add("l2cap.ble.tx.bytes", p_buf->len);
//counter_add("l2cap.ble.tx.pkts", 1);
UINT16_TO_STREAM (p, L2CAP_BLE_SIGNALLING_CID);
} else
#endif
{
//counter_add("l2cap.sig.tx.bytes", p_buf->len);
//counter_add("l2cap.sig.tx.pkts", 1);
UINT16_TO_STREAM (p, L2CAP_SIGNALLING_CID);
}
/* Put in L2CAP command header */
UINT8_TO_STREAM (p, cmd);
UINT8_TO_STREAM (p, id);
UINT16_TO_STREAM (p, len);
return (p_buf);
}
/*******************************************************************************
**
** Function l2cu_adj_id
**
** Description Checks for valid ID based on specified mask
** and adjusts the id if invalid.
**
** Returns void
**
*******************************************************************************/
void l2cu_adj_id (tL2C_LCB *p_lcb, UINT8 adj_mask)
{
if ((adj_mask & L2CAP_ADJ_ZERO_ID) && !p_lcb->id) {
p_lcb->id++;
}
}
/*******************************************************************************
**
** Function l2cu_send_peer_cmd_reject
**
** Description Build and send an L2CAP "command reject" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_cmd_reject (tL2C_LCB *p_lcb, UINT16 reason, UINT8 rem_id,
UINT16 p1, UINT16 p2)
{
UINT16 param_len;
BT_HDR *p_buf;
UINT8 *p;
/* Put in L2CAP packet header */
if (reason == L2CAP_CMD_REJ_MTU_EXCEEDED) {
param_len = 2;
} else if (reason == L2CAP_CMD_REJ_INVALID_CID) {
param_len = 4;
} else {
param_len = 0;
}
if ((p_buf = l2cu_build_header (p_lcb, (UINT16) (L2CAP_CMD_REJECT_LEN + param_len), L2CAP_CMD_REJECT, rem_id)) == NULL ) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer cmd_rej");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE +
L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, reason);
if (param_len >= 2) {
UINT16_TO_STREAM (p, p1);
}
if (param_len >= 4) {
UINT16_TO_STREAM (p, p2);
}
l2c_link_check_send_pkts (p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_send_peer_connect_req
**
** Description Build and send an L2CAP "connection request" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_connect_req (tL2C_CCB *p_ccb)
{
BT_HDR *p_buf;
UINT8 *p;
/* Create an identifier for this packet */
p_ccb->p_lcb->id++;
l2cu_adj_id(p_ccb->p_lcb, L2CAP_ADJ_ID);
p_ccb->local_id = p_ccb->p_lcb->id;
if ((p_buf = l2cu_build_header (p_ccb->p_lcb, L2CAP_CONN_REQ_LEN, L2CAP_CMD_CONN_REQ,
p_ccb->local_id)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer for conn_req");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE +
L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, p_ccb->p_rcb->real_psm);
UINT16_TO_STREAM (p, p_ccb->local_cid);
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_send_peer_connect_rsp
**
** Description Build and send an L2CAP "connection response" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_connect_rsp (tL2C_CCB *p_ccb, UINT16 result, UINT16 status)
{
BT_HDR *p_buf;
UINT8 *p;
if (result == L2CAP_CONN_PENDING) {
/* if we already sent pending response */
if (p_ccb->flags & CCB_FLAG_SENT_PENDING) {
return;
} else {
p_ccb->flags |= CCB_FLAG_SENT_PENDING;
}
}
if ((p_buf = l2cu_build_header(p_ccb->p_lcb, L2CAP_CONN_RSP_LEN, L2CAP_CMD_CONN_RSP, p_ccb->remote_id)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer for conn_rsp");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE +
L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, p_ccb->local_cid);
UINT16_TO_STREAM (p, p_ccb->remote_cid);
UINT16_TO_STREAM (p, result);
UINT16_TO_STREAM (p, status);
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_reject_connection
**
** Description Build and send an L2CAP "connection response neg" message
** to the peer. This function is called when there is no peer
** CCB (non-existant PSM or no resources).
**
** Returns void
**
*******************************************************************************/
void l2cu_reject_connection (tL2C_LCB *p_lcb, UINT16 remote_cid, UINT8 rem_id, UINT16 result)
{
BT_HDR *p_buf;
UINT8 *p;
if ((p_buf = l2cu_build_header(p_lcb, L2CAP_CONN_RSP_LEN, L2CAP_CMD_CONN_RSP, rem_id)) == NULL ) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer for conn_req");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, 0); /* Local CID of 0 */
UINT16_TO_STREAM (p, remote_cid);
UINT16_TO_STREAM (p, result);
UINT16_TO_STREAM (p, 0); /* Status of 0 */
l2c_link_check_send_pkts (p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_send_peer_config_req
**
** Description Build and send an L2CAP "configuration request" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_config_req (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
{
BT_HDR *p_buf;
UINT16 cfg_len = 0;
UINT8 *p;
/* Create an identifier for this packet */
p_ccb->p_lcb->id++;
l2cu_adj_id(p_ccb->p_lcb, L2CAP_ADJ_ID);
p_ccb->local_id = p_ccb->p_lcb->id;
if (p_cfg->mtu_present) {
cfg_len += L2CAP_CFG_MTU_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->flush_to_present) {
cfg_len += L2CAP_CFG_FLUSH_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->qos_present) {
cfg_len += L2CAP_CFG_QOS_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->fcr_present) {
cfg_len += L2CAP_CFG_FCR_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->fcs_present) {
cfg_len += L2CAP_CFG_FCS_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->ext_flow_spec_present) {
cfg_len += L2CAP_CFG_EXT_FLOW_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if ((p_buf = l2cu_build_header (p_ccb->p_lcb, (UINT16) (L2CAP_CONFIG_REQ_LEN + cfg_len),
L2CAP_CMD_CONFIG_REQ, p_ccb->local_id)) == NULL ) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer for conn_req");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE +
L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, p_ccb->remote_cid);
UINT16_TO_STREAM (p, p_cfg->flags); /* Flags (continuation) */
/* Now, put the options */
if (p_cfg->mtu_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_MTU);
UINT8_TO_STREAM (p, L2CAP_CFG_MTU_OPTION_LEN);
UINT16_TO_STREAM (p, p_cfg->mtu);
}
if (p_cfg->flush_to_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_FLUSH_TOUT);
UINT8_TO_STREAM (p, L2CAP_CFG_FLUSH_OPTION_LEN);
UINT16_TO_STREAM (p, p_cfg->flush_to);
}
if (p_cfg->qos_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_QOS);
UINT8_TO_STREAM (p, L2CAP_CFG_QOS_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->qos.qos_flags);
UINT8_TO_STREAM (p, p_cfg->qos.service_type);
UINT32_TO_STREAM (p, p_cfg->qos.token_rate);
UINT32_TO_STREAM (p, p_cfg->qos.token_bucket_size);
UINT32_TO_STREAM (p, p_cfg->qos.peak_bandwidth);
UINT32_TO_STREAM (p, p_cfg->qos.latency);
UINT32_TO_STREAM (p, p_cfg->qos.delay_variation);
}
if (p_cfg->fcr_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_FCR);
UINT8_TO_STREAM (p, L2CAP_CFG_FCR_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->fcr.mode);
UINT8_TO_STREAM (p, p_cfg->fcr.tx_win_sz);
UINT8_TO_STREAM (p, p_cfg->fcr.max_transmit);
UINT16_TO_STREAM (p, p_cfg->fcr.rtrans_tout);
UINT16_TO_STREAM (p, p_cfg->fcr.mon_tout);
UINT16_TO_STREAM (p, p_cfg->fcr.mps);
}
if (p_cfg->fcs_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_FCS);
UINT8_TO_STREAM (p, L2CAP_CFG_FCS_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->fcs);
}
if (p_cfg->ext_flow_spec_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_EXT_FLOW);
UINT8_TO_STREAM (p, L2CAP_CFG_EXT_FLOW_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->ext_flow_spec.id);
UINT8_TO_STREAM (p, p_cfg->ext_flow_spec.stype);
UINT16_TO_STREAM (p, p_cfg->ext_flow_spec.max_sdu_size);
UINT32_TO_STREAM (p, p_cfg->ext_flow_spec.sdu_inter_time);
UINT32_TO_STREAM (p, p_cfg->ext_flow_spec.access_latency);
UINT32_TO_STREAM (p, p_cfg->ext_flow_spec.flush_timeout);
}
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_send_peer_config_rsp
**
** Description Build and send an L2CAP "configuration response" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_config_rsp (tL2C_CCB *p_ccb, tL2CAP_CFG_INFO *p_cfg)
{
BT_HDR *p_buf;
UINT16 cfg_len = 0;
UINT8 *p;
/* Create an identifier for this packet */
if (p_cfg->mtu_present) {
cfg_len += L2CAP_CFG_MTU_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->flush_to_present) {
cfg_len += L2CAP_CFG_FLUSH_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->qos_present) {
cfg_len += L2CAP_CFG_QOS_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->fcr_present) {
cfg_len += L2CAP_CFG_FCR_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if (p_cfg->ext_flow_spec_present) {
cfg_len += L2CAP_CFG_EXT_FLOW_OPTION_LEN + L2CAP_CFG_OPTION_OVERHEAD;
}
if ((p_buf = l2cu_build_header (p_ccb->p_lcb, (UINT16)(L2CAP_CONFIG_RSP_LEN + cfg_len),
L2CAP_CMD_CONFIG_RSP, p_ccb->remote_id)) == NULL ) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer for conn_req");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, p_ccb->remote_cid);
UINT16_TO_STREAM (p, p_cfg->flags); /* Flags (continuation) Must match request */
UINT16_TO_STREAM (p, p_cfg->result);
/* Now, put the options */
if (p_cfg->mtu_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_MTU);
UINT8_TO_STREAM (p, L2CAP_CFG_MTU_OPTION_LEN);
UINT16_TO_STREAM (p, p_cfg->mtu);
}
if (p_cfg->flush_to_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_FLUSH_TOUT);
UINT8_TO_STREAM (p, L2CAP_CFG_FLUSH_OPTION_LEN);
UINT16_TO_STREAM (p, p_cfg->flush_to);
}
if (p_cfg->qos_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_QOS);
UINT8_TO_STREAM (p, L2CAP_CFG_QOS_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->qos.qos_flags);
UINT8_TO_STREAM (p, p_cfg->qos.service_type);
UINT32_TO_STREAM (p, p_cfg->qos.token_rate);
UINT32_TO_STREAM (p, p_cfg->qos.token_bucket_size);
UINT32_TO_STREAM (p, p_cfg->qos.peak_bandwidth);
UINT32_TO_STREAM (p, p_cfg->qos.latency);
UINT32_TO_STREAM (p, p_cfg->qos.delay_variation);
}
if (p_cfg->fcr_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_FCR);
UINT8_TO_STREAM (p, L2CAP_CFG_FCR_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->fcr.mode);
UINT8_TO_STREAM (p, p_cfg->fcr.tx_win_sz);
UINT8_TO_STREAM (p, p_cfg->fcr.max_transmit);
UINT16_TO_STREAM (p, p_ccb->our_cfg.fcr.rtrans_tout);
UINT16_TO_STREAM (p, p_ccb->our_cfg.fcr.mon_tout);
UINT16_TO_STREAM (p, p_cfg->fcr.mps);
}
if (p_cfg->ext_flow_spec_present) {
UINT8_TO_STREAM (p, L2CAP_CFG_TYPE_EXT_FLOW);
UINT8_TO_STREAM (p, L2CAP_CFG_EXT_FLOW_OPTION_LEN);
UINT8_TO_STREAM (p, p_cfg->ext_flow_spec.id);
UINT8_TO_STREAM (p, p_cfg->ext_flow_spec.stype);
UINT16_TO_STREAM (p, p_cfg->ext_flow_spec.max_sdu_size);
UINT32_TO_STREAM (p, p_cfg->ext_flow_spec.sdu_inter_time);
UINT32_TO_STREAM (p, p_cfg->ext_flow_spec.access_latency);
UINT32_TO_STREAM (p, p_cfg->ext_flow_spec.flush_timeout);
}
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_send_peer_config_rej
**
** Description Build and send an L2CAP "configuration reject" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_config_rej (tL2C_CCB *p_ccb, UINT8 *p_data, UINT16 data_len, UINT16 rej_len)
{
BT_HDR *p_buf;
UINT16 len, cfg_len, buf_space, len1;
UINT8 *p, *p_hci_len, *p_data_end;
UINT8 cfg_code;
L2CAP_TRACE_DEBUG("l2cu_send_peer_config_rej: data_len=%d, rej_len=%d", data_len, rej_len);
len = BT_HDR_SIZE + HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD + L2CAP_CONFIG_RSP_LEN;
len1 = 0xFFFF - len;
if (rej_len > len1) {
L2CAP_TRACE_ERROR ("L2CAP - cfg_rej pkt size exceeds buffer design max limit.");
return;
}
p_buf = (BT_HDR *)osi_malloc (len + rej_len);
if (!p_buf) {
L2CAP_TRACE_ERROR ("L2CAP - no buffer for cfg_rej");
return;
}
p_buf->offset = L2CAP_SEND_CMD_OFFSET;
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET;
/* Put in HCI header - handle + pkt boundary */
#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
if (HCI_NON_FLUSHABLE_PB_SUPPORTED(BTM_ReadLocalFeatures ())) {
UINT16_TO_STREAM (p, (p_ccb->p_lcb->handle | (L2CAP_PKT_START_NON_FLUSHABLE << L2CAP_PKT_TYPE_SHIFT)));
} else
#endif
{
UINT16_TO_STREAM (p, (p_ccb->p_lcb->handle | (L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT)));
}
/* Remember the HCI header length position, and save space for it */
p_hci_len = p;
p += 2;
/* Put in L2CAP packet header */
UINT16_TO_STREAM (p, L2CAP_CMD_OVERHEAD + L2CAP_CONFIG_RSP_LEN + rej_len);
UINT16_TO_STREAM (p, L2CAP_SIGNALLING_CID);
/* Put in L2CAP command header */
UINT8_TO_STREAM (p, L2CAP_CMD_CONFIG_RSP);
UINT8_TO_STREAM (p, p_ccb->remote_id);
UINT16_TO_STREAM (p, L2CAP_CONFIG_RSP_LEN + rej_len);
UINT16_TO_STREAM (p, p_ccb->remote_cid);
UINT16_TO_STREAM (p, 0); /* Flags = 0 (no continuation) */
UINT16_TO_STREAM (p, L2CAP_CFG_UNKNOWN_OPTIONS);
buf_space = rej_len;
/* Now, put the rejected options */
p_data_end = p_data + data_len;
while (p_data < p_data_end) {
cfg_code = *p_data;
cfg_len = *(p_data + 1);
switch (cfg_code & 0x7F) {
/* skip known options */
case L2CAP_CFG_TYPE_MTU:
case L2CAP_CFG_TYPE_FLUSH_TOUT:
case L2CAP_CFG_TYPE_QOS:
p_data += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
break;
/* unknown options; copy into rsp if not hints */
default:
/* sanity check option length */
if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= data_len) {
if ((cfg_code & 0x80) == 0) {
if (buf_space >= (cfg_len + L2CAP_CFG_OPTION_OVERHEAD)) {
memcpy(p, p_data, cfg_len + L2CAP_CFG_OPTION_OVERHEAD);
p += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
buf_space -= (cfg_len + L2CAP_CFG_OPTION_OVERHEAD);
} else {
L2CAP_TRACE_WARNING("L2CAP - cfg_rej exceeds allocated buffer");
p_data = p_data_end; /* force loop exit */
break;
}
}
p_data += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
}
/* bad length; force loop exit */
else {
p_data = p_data_end;
}
break;
}
}
len = (UINT16) (p - p_hci_len - 2);
UINT16_TO_STREAM (p_hci_len, len);
p_buf->len = len + 4;
L2CAP_TRACE_DEBUG ("L2CAP - cfg_rej pkt hci_len=%d, l2cap_len=%d",
len, (L2CAP_CMD_OVERHEAD + L2CAP_CONFIG_RSP_LEN + rej_len));
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
}
/*******************************************************************************
**
** Function l2cu_send_peer_disc_req
**
** Description Build and send an L2CAP "disconnect request" message
** to the peer.
**
** Returns void
**
*******************************************************************************/
void l2cu_send_peer_disc_req (tL2C_CCB *p_ccb)
{
BT_HDR *p_buf, *p_buf2;
UINT8 *p;
/* Create an identifier for this packet */
p_ccb->p_lcb->id++;
l2cu_adj_id(p_ccb->p_lcb, L2CAP_ADJ_ID);
p_ccb->local_id = p_ccb->p_lcb->id;
if ((p_buf = l2cu_build_header(p_ccb->p_lcb, L2CAP_DISC_REQ_LEN, L2CAP_CMD_DISC_REQ, p_ccb->local_id)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no buffer for disc_req");
return;
}
p = (UINT8 *)(p_buf + 1) + L2CAP_SEND_CMD_OFFSET + HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_CMD_OVERHEAD;
UINT16_TO_STREAM (p, p_ccb->remote_cid);
UINT16_TO_STREAM (p, p_ccb->local_cid);
/* Move all queued data packets to the LCB. In FCR mode, assume the higher
layer checks that all buffers are sent before disconnecting.
*/
if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) {
while ((p_buf2 = (BT_HDR *)fixed_queue_dequeue(p_ccb->xmit_hold_q, 0)) != NULL) {
l2cu_set_acl_hci_header (p_buf2, p_ccb);
l2c_link_check_send_pkts (p_ccb->p_lcb, p_ccb, p_buf2);
}
}
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, p_buf);
}
/*******************************************************************************
**