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esp-idf/components/bt/host/bluedroid/stack/l2cap/l2c_main.c
xiongweichao 50f34eb553 Dereference after null check
2021-11-22 10:47:07 +08:00

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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 the main L2CAP entry points
*
******************************************************************************/
#include <stdlib.h>
#include <string.h>
//#include <stdio.h>
#include "device/controller.h"
//#include "btcore/include/counter.h"
#include "common/bt_target.h"
#include "btm_int.h"
#include "stack/btu.h"
#include "stack/hcimsgs.h"
#include "stack/l2c_api.h"
#include "l2c_int.h"
#include "stack/l2cdefs.h"
//#include "osi/include/log.h"
/********************************************************************************/
/* L O C A L F U N C T I O N P R O T O T Y P E S */
/********************************************************************************/
#if (CLASSIC_BT_INCLUDED == TRUE)
static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len);
#endif ///CLASSIC_BT_INCLUDED == TRUE
/********************************************************************************/
/* G L O B A L L 2 C A P D A T A */
/********************************************************************************/
#if L2C_DYNAMIC_MEMORY == FALSE
tL2C_CB l2cb;
#else
tL2C_CB *l2c_cb_ptr;
#endif
#if 0 //Unused
/*******************************************************************************
**
** Function l2c_bcst_msg
**
** Description
**
** Returns void
**
*******************************************************************************/
void l2c_bcst_msg( BT_HDR *p_buf, UINT16 psm )
{
UINT8 *p;
/* Ensure we have enough space in the buffer for the L2CAP and HCI headers */
if (p_buf->offset < L2CAP_BCST_MIN_OFFSET) {
L2CAP_TRACE_ERROR ("L2CAP - cannot send buffer, offset: %d", p_buf->offset);
osi_free (p_buf);
return;
}
/* Step back some bytes to add the headers */
p_buf->offset -= (HCI_DATA_PREAMBLE_SIZE + L2CAP_PKT_OVERHEAD + L2CAP_BCST_OVERHEAD);
p_buf->len += L2CAP_PKT_OVERHEAD + L2CAP_BCST_OVERHEAD;
/* Set the pointer to the beginning of the data */
p = (UINT8 *)(p_buf + 1) + p_buf->offset;
/* First, the HCI transport header */
UINT16_TO_STREAM (p, 0x0050 | (L2CAP_PKT_START << 12) | (2 << 14));
uint16_t acl_data_size = controller_get_interface()->get_acl_data_size_classic();
/* The HCI transport will segment the buffers. */
if (p_buf->len > acl_data_size) {
UINT16_TO_STREAM (p, acl_data_size);
} else {
UINT16_TO_STREAM (p, p_buf->len);
}
/* Now the L2CAP header */
UINT16_TO_STREAM (p, p_buf->len - L2CAP_PKT_OVERHEAD);
UINT16_TO_STREAM (p, L2CAP_CONNECTIONLESS_CID);
UINT16_TO_STREAM (p, psm);
p_buf->len += HCI_DATA_PREAMBLE_SIZE;
if (p_buf->len <= controller_get_interface()->get_acl_packet_size_classic()) {
//counter_add("l2cap.ch2.tx.bytes", p_buf->len);
//counter_add("l2cap.ch2.tx.pkts", 1);
bte_main_hci_send(p_buf, BT_EVT_TO_LM_HCI_ACL);
}
}
#endif
/*******************************************************************************
**
** Function l2c_rcv_acl_data
**
** Description This function is called from the HCI Interface when an ACL
** data packet is received.
**
** Returns void
**
*******************************************************************************/
void l2c_rcv_acl_data (BT_HDR *p_msg)
{
UINT8 *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
UINT16 handle, hci_len;
UINT8 pkt_type;
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb = NULL;
UINT16 l2cap_len, rcv_cid;
#if (!CONFIG_BT_STACK_NO_LOG)
UINT16 psm;
#endif
UINT16 credit;
/* Extract the handle */
STREAM_TO_UINT16 (handle, p);
pkt_type = HCID_GET_EVENT (handle);
handle = HCID_GET_HANDLE (handle);
/* Since the HCI Transport is putting segmented packets back together, we */
/* should never get a valid packet with the type set to "continuation" */
if (pkt_type != L2CAP_PKT_CONTINUE) {
/* Find the LCB based on the handle */
if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL) {
UINT8 cmd_code;
/* There is a slight possibility (specifically with USB) that we get an */
/* L2CAP connection request before we get the HCI connection complete. */
/* So for these types of messages, hold them for up to 2 seconds. */
STREAM_TO_UINT16 (hci_len, p);
STREAM_TO_UINT16 (l2cap_len, p);
STREAM_TO_UINT16 (rcv_cid, p);
STREAM_TO_UINT8 (cmd_code, p);
if ((p_msg->layer_specific == 0) && (rcv_cid == L2CAP_SIGNALLING_CID)
&& (cmd_code == L2CAP_CMD_INFO_REQ || cmd_code == L2CAP_CMD_CONN_REQ)) {
L2CAP_TRACE_WARNING ("L2CAP - holding ACL for unknown handle:%d ls:%d"
" cid:%d opcode:%d cur count:%d", handle, p_msg->layer_specific,
rcv_cid, cmd_code, list_length(l2cb.rcv_pending_q));
p_msg->layer_specific = 2;
list_append(l2cb.rcv_pending_q, p_msg);
if (list_length(l2cb.rcv_pending_q) == 1) {
btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT);
}
return;
} else {
L2CAP_TRACE_ERROR ("L2CAP - rcvd ACL for unknown handle:%d ls:%d cid:%d"
" opcode:%d cur count:%d", handle, p_msg->layer_specific, rcv_cid,
cmd_code, list_length(l2cb.rcv_pending_q));
}
osi_free (p_msg);
return;
}
} else {
L2CAP_TRACE_WARNING ("L2CAP - expected pkt start or complete, got: %d", pkt_type);
osi_free (p_msg);
return;
}
/* Extract the length and update the buffer header */
STREAM_TO_UINT16 (hci_len, p);
p_msg->offset += 4;
/* Extract the length and CID */
STREAM_TO_UINT16 (l2cap_len, p);
STREAM_TO_UINT16 (rcv_cid, p);
#if BLE_INCLUDED == TRUE
/* for BLE channel, always notify connection when ACL data received on the link */
if (p_lcb && p_lcb->transport == BT_TRANSPORT_LE && p_lcb->link_state != LST_DISCONNECTING)
/* only process fixed channel data as channel open indication when link is not in disconnecting mode */
{
l2cble_notify_le_connection(p_lcb->remote_bd_addr);
}
#endif
L2CAP_TRACE_DEBUG ("L2CAP - rcv_cid CID: 0x%04x\n", rcv_cid);
/* Find the CCB for this CID */
if (rcv_cid >= L2CAP_BASE_APPL_CID) {
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, rcv_cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - unknown CID: 0x%04x", rcv_cid);
osi_free (p_msg);
return;
}
}
if (hci_len >= L2CAP_PKT_OVERHEAD) { /* Must receive at least the L2CAP length and CID.*/
p_msg->len = hci_len - L2CAP_PKT_OVERHEAD;
p_msg->offset += L2CAP_PKT_OVERHEAD;
} else {
L2CAP_TRACE_WARNING ("L2CAP - got incorrect hci header" );
osi_free (p_msg);
return;
}
if (l2cap_len != p_msg->len) {
L2CAP_TRACE_WARNING ("L2CAP - bad length in pkt. Exp: %d Act: %d",
l2cap_len, p_msg->len);
osi_free (p_msg);
return;
}
/* Send the data through the channel state machine */
if (rcv_cid == L2CAP_SIGNALLING_CID) {
//counter_add("l2cap.sig.rx.bytes", l2cap_len);
//counter_add("l2cap.sig.rx.pkts", 1);
#if (CLASSIC_BT_INCLUDED == TRUE)
process_l2cap_cmd (p_lcb, p, l2cap_len);
#endif ///CLASSIC_BT_INCLUDED == TRUE
osi_free (p_msg);
} else if (rcv_cid == L2CAP_CONNECTIONLESS_CID) {
//counter_add("l2cap.ch2.rx.bytes", l2cap_len);
//counter_add("l2cap.ch2.rx.pkts", 1);
/* process_connectionless_data (p_lcb); */
#if !CONFIG_BT_STACK_NO_LOG
STREAM_TO_UINT16 (psm, p);
#endif
L2CAP_TRACE_DEBUG( "GOT CONNECTIONLESS DATA PSM:%d", psm ) ;
#if (L2CAP_UCD_INCLUDED == TRUE)
/* if it is not broadcast, check UCD registration */
if ( l2c_ucd_check_rx_pkts( p_lcb, p_msg ) ) {
/* nothing to do */
} else
#endif
{
osi_free (p_msg);
}
}
#if (BLE_INCLUDED == TRUE)
else if (rcv_cid == L2CAP_BLE_SIGNALLING_CID) {
//counter_add("l2cap.ble.rx.bytes", l2cap_len);
//counter_add("l2cap.ble.rx.pkts", 1);
l2cble_process_sig_cmd (p_lcb, p, l2cap_len);
osi_free (p_msg);
}
#endif
#if (L2CAP_NUM_FIXED_CHNLS > 0)
else if ((rcv_cid >= L2CAP_FIRST_FIXED_CHNL) && (rcv_cid <= L2CAP_LAST_FIXED_CHNL) &&
(l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb != NULL) ) {
//counter_add("l2cap.fix.rx.bytes", l2cap_len);
//counter_add("l2cap.fix.rx.pkts", 1);
/* If no CCB for this channel, allocate one */
if (p_lcb &&
/* only process fixed channel data when link is open or wait for data indication */
(p_lcb->link_state != LST_DISCONNECTING) &&
l2cu_initialize_fixed_ccb (p_lcb, rcv_cid, &l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) {
p_ccb = p_lcb->p_fixed_ccbs[rcv_cid - L2CAP_FIRST_FIXED_CHNL];
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_BASIC_MODE) {
#if (CLASSIC_BT_INCLUDED == TRUE)
l2c_fcr_proc_pdu (p_ccb, p_msg);
#endif ///CLASSIC_BT_INCLUDED == TRUE
} else {
(*l2cb.fixed_reg[rcv_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb)
(rcv_cid, p_lcb->remote_bd_addr, p_msg);
}
} else {
osi_free (p_msg);
}
}
#endif
else {
//counter_add("l2cap.dyn.rx.bytes", l2cap_len);
//counter_add("l2cap.dyn.rx.pkts", 1);
if (p_ccb == NULL) {
osi_free (p_msg);
} else {
if (p_lcb->transport == BT_TRANSPORT_LE) {
// Got a pkt, valid send out credits to the peer device
credit = L2CAP_LE_DEFAULT_CREDIT;
L2CAP_TRACE_DEBUG("%s Credits received %d",__func__, credit);
if((p_ccb->peer_conn_cfg.credits + credit) > L2CAP_LE_MAX_CREDIT) {
/* we have received credits more than max coc credits,
* so disconnecting the Le Coc Channel
*/
#if (BLE_INCLUDED == TRUE)
l2cble_send_peer_disc_req (p_ccb);
#endif ///BLE_INCLUDED == TRUE
} else {
p_ccb->peer_conn_cfg.credits += credit;
l2c_link_check_send_pkts (p_ccb->p_lcb, NULL, NULL);
}
}
/* Basic mode packets go straight to the state machine */
if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) {
#if (CLASSIC_BT_INCLUDED == TRUE)
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg);
#endif ///CLASSIC_BT_INCLUDED == TRUE
} else {
/* eRTM or streaming mode, so we need to validate states first */
if ((p_ccb->chnl_state == CST_OPEN) || (p_ccb->chnl_state == CST_CONFIG)) {
#if (CLASSIC_BT_INCLUDED == TRUE)
l2c_fcr_proc_pdu (p_ccb, p_msg);
#endif ///CLASSIC_BT_INCLUDED == TRUE
} else {
osi_free (p_msg);
}
}
}
}
}
/*******************************************************************************
**
** Function process_l2cap_cmd
**
** Description This function is called when a packet is received on the
** L2CAP signalling CID
**
** Returns void
**
*******************************************************************************/
#if (CLASSIC_BT_INCLUDED == TRUE)
static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len)
{
UINT8 *p_pkt_end, *p_next_cmd, *p_cfg_end, *p_cfg_start;
UINT8 cmd_code, cfg_code, cfg_len, id;
tL2C_CONN_INFO con_info;
tL2CAP_CFG_INFO cfg_info;
UINT16 rej_reason, rej_mtu, lcid, rcid, info_type;
tL2C_CCB *p_ccb;
tL2C_RCB *p_rcb;
BOOLEAN cfg_rej, pkt_size_rej = FALSE;
UINT16 cfg_rej_len, cmd_len;
UINT16 result;
tL2C_CONN_INFO ci;
#if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE)
/* if l2cap command received in CID 1 on top of an LE link, ignore this command */
if (p_lcb->transport == BT_TRANSPORT_LE) {
return;
}
#endif
/* Reject the packet if it exceeds the default Signalling Channel MTU */
if (pkt_len > L2CAP_DEFAULT_MTU) {
/* Core Spec requires a single response to the first command found in a multi-command
** L2cap packet. If only responses in the packet, then it will be ignored.
** Here we simply mark the bad packet and decide which cmd ID to reject later
*/
pkt_size_rej = TRUE;
L2CAP_TRACE_ERROR ("L2CAP SIG MTU Pkt Len Exceeded (672) -> pkt_len: %d", pkt_len);
}
p_next_cmd = p;
p_pkt_end = p + pkt_len;
memset (&cfg_info, 0, sizeof(cfg_info));
/* An L2CAP packet may contain multiple commands */
while (TRUE) {
/* Smallest command is 4 bytes */
if ((p = p_next_cmd) > (p_pkt_end - 4)) {
break;
}
STREAM_TO_UINT8 (cmd_code, p);
STREAM_TO_UINT8 (id, p);
STREAM_TO_UINT16 (cmd_len, p);
/* Check command length does not exceed packet length */
if ((p_next_cmd = p + cmd_len) > p_pkt_end) {
L2CAP_TRACE_WARNING ("Command len bad pkt_len: %d cmd_len: %d code: %d",
pkt_len, cmd_len, cmd_code);
break;
}
L2CAP_TRACE_DEBUG ("cmd_code: %d, id:%d, cmd_len:%d", cmd_code, id, cmd_len);
/* Bad L2CAP packet length, look or cmd to reject */
if (pkt_size_rej) {
/* If command found rejected it and we're done, otherwise keep looking */
if (l2c_is_cmd_rejected(cmd_code, id, p_lcb)) {
return;
} else {
continue; /* Look for next cmd/response in current packet */
}
}
switch (cmd_code) {
case L2CAP_CMD_REJECT:
STREAM_TO_UINT16 (rej_reason, p);
if (rej_reason == L2CAP_CMD_REJ_MTU_EXCEEDED) {
STREAM_TO_UINT16 (rej_mtu, p);
/* What to do with the MTU reject ? We have negotiated an MTU. For now */
/* we will ignore it and let a higher protocol timeout take care of it */
L2CAP_TRACE_WARNING ("L2CAP - MTU rej Handle: %d MTU: %d", p_lcb->handle, rej_mtu);
}
if (rej_reason == L2CAP_CMD_REJ_INVALID_CID) {
STREAM_TO_UINT16 (rcid, p);
STREAM_TO_UINT16 (lcid, p);
L2CAP_TRACE_WARNING ("L2CAP - rej with CID invalid, LCID: 0x%04x RCID: 0x%04x", lcid, rcid);
/* Remote CID invalid. Treat as a disconnect */
if (((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL)
&& (p_ccb->remote_cid == rcid)) {
/* Fake link disconnect - no reply is generated */
l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
}
}
/* SonyEricsson Info request Bug workaround (Continue connection) */
else if (rej_reason == L2CAP_CMD_REJ_NOT_UNDERSTOOD && p_lcb->w4_info_rsp) {
btu_stop_timer (&p_lcb->info_timer_entry);
p_lcb->w4_info_rsp = FALSE;
ci.status = HCI_SUCCESS;
memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
/* For all channels, send the event through their FSMs */
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
}
}
break;
case L2CAP_CMD_CONN_REQ:
STREAM_TO_UINT16 (con_info.psm, p);
STREAM_TO_UINT16 (rcid, p);
if ((p_rcb = l2cu_find_rcb_by_psm (con_info.psm)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for unknown PSM: %d", con_info.psm);
l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
break;
} else {
if (!p_rcb->api.pL2CA_ConnectInd_Cb) {
L2CAP_TRACE_WARNING ("L2CAP - rcvd conn req for outgoing-only connection PSM: %d", con_info.psm);
l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_PSM);
break;
}
}
if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL) {
L2CAP_TRACE_ERROR ("L2CAP - unable to allocate CCB");
l2cu_reject_connection (p_lcb, rcid, id, L2CAP_CONN_NO_RESOURCES);
break;
}
p_ccb->remote_id = id;
p_ccb->p_rcb = p_rcb;
p_ccb->remote_cid = rcid;
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_REQ, &con_info);
break;
case L2CAP_CMD_CONN_RSP:
STREAM_TO_UINT16 (con_info.remote_cid, p);
STREAM_TO_UINT16 (lcid, p);
STREAM_TO_UINT16 (con_info.l2cap_result, p);
STREAM_TO_UINT16 (con_info.l2cap_status, p);
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for conn rsp, LCID: %d RCID: %d",
lcid, con_info.remote_cid);
break;
}
if (p_ccb->local_id != id) {
L2CAP_TRACE_WARNING ("L2CAP - con rsp - bad ID. Exp: %d Got: %d",
p_ccb->local_id, id);
break;
}
if (con_info.l2cap_result == L2CAP_CONN_OK) {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP, &con_info);
} else if (con_info.l2cap_result == L2CAP_CONN_PENDING) {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_PND, &con_info);
} else {
l2c_csm_execute(p_ccb, L2CEVT_L2CAP_CONNECT_RSP_NEG, &con_info);
}
break;
case L2CAP_CMD_CONFIG_REQ:
p_cfg_end = p + cmd_len;
cfg_rej = FALSE;
cfg_rej_len = 0;
STREAM_TO_UINT16 (lcid, p);
STREAM_TO_UINT16 (cfg_info.flags, p);
p_cfg_start = p;
cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
while (p < p_cfg_end) {
STREAM_TO_UINT8 (cfg_code, p);
STREAM_TO_UINT8 (cfg_len, p);
switch (cfg_code & 0x7F) {
case L2CAP_CFG_TYPE_MTU:
cfg_info.mtu_present = TRUE;
STREAM_TO_UINT16 (cfg_info.mtu, p);
break;
case L2CAP_CFG_TYPE_FLUSH_TOUT:
cfg_info.flush_to_present = TRUE;
STREAM_TO_UINT16 (cfg_info.flush_to, p);
break;
case L2CAP_CFG_TYPE_QOS:
cfg_info.qos_present = TRUE;
STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
STREAM_TO_UINT32 (cfg_info.qos.latency, p);
STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
break;
case L2CAP_CFG_TYPE_FCR:
cfg_info.fcr_present = TRUE;
STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
break;
case L2CAP_CFG_TYPE_FCS:
cfg_info.fcs_present = TRUE;
STREAM_TO_UINT8 (cfg_info.fcs, p);
break;
case L2CAP_CFG_TYPE_EXT_FLOW:
cfg_info.ext_flow_spec_present = TRUE;
STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
break;
default:
/* sanity check option length */
if ((cfg_len + L2CAP_CFG_OPTION_OVERHEAD) <= cmd_len) {
p += cfg_len;
if ((cfg_code & 0x80) == 0) {
cfg_rej_len += cfg_len + L2CAP_CFG_OPTION_OVERHEAD;
cfg_rej = TRUE;
}
}
/* bad length; force loop exit */
else {
p = p_cfg_end;
cfg_rej = TRUE;
}
break;
}
}
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) {
p_ccb->remote_id = id;
if (cfg_rej) {
l2cu_send_peer_config_rej (p_ccb, p_cfg_start, (UINT16) (cmd_len - L2CAP_CONFIG_REQ_LEN), cfg_rej_len);
} else {
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_REQ, &cfg_info);
}
} else {
/* updated spec says send command reject on invalid cid */
l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_INVALID_CID, id, 0, 0);
}
break;
case L2CAP_CMD_CONFIG_RSP:
p_cfg_end = p + cmd_len;
STREAM_TO_UINT16 (lcid, p);
STREAM_TO_UINT16 (cfg_info.flags, p);
STREAM_TO_UINT16 (cfg_info.result, p);
cfg_info.flush_to_present = cfg_info.mtu_present = cfg_info.qos_present =
cfg_info.fcr_present = cfg_info.fcs_present = FALSE;
while (p < p_cfg_end) {
STREAM_TO_UINT8 (cfg_code, p);
STREAM_TO_UINT8 (cfg_len, p);
switch (cfg_code & 0x7F) {
case L2CAP_CFG_TYPE_MTU:
cfg_info.mtu_present = TRUE;
STREAM_TO_UINT16 (cfg_info.mtu, p);
break;
case L2CAP_CFG_TYPE_FLUSH_TOUT:
cfg_info.flush_to_present = TRUE;
STREAM_TO_UINT16 (cfg_info.flush_to, p);
break;
case L2CAP_CFG_TYPE_QOS:
cfg_info.qos_present = TRUE;
STREAM_TO_UINT8 (cfg_info.qos.qos_flags, p);
STREAM_TO_UINT8 (cfg_info.qos.service_type, p);
STREAM_TO_UINT32 (cfg_info.qos.token_rate, p);
STREAM_TO_UINT32 (cfg_info.qos.token_bucket_size, p);
STREAM_TO_UINT32 (cfg_info.qos.peak_bandwidth, p);
STREAM_TO_UINT32 (cfg_info.qos.latency, p);
STREAM_TO_UINT32 (cfg_info.qos.delay_variation, p);
break;
case L2CAP_CFG_TYPE_FCR:
cfg_info.fcr_present = TRUE;
STREAM_TO_UINT8 (cfg_info.fcr.mode, p);
STREAM_TO_UINT8 (cfg_info.fcr.tx_win_sz, p);
STREAM_TO_UINT8 (cfg_info.fcr.max_transmit, p);
STREAM_TO_UINT16 (cfg_info.fcr.rtrans_tout, p);
STREAM_TO_UINT16 (cfg_info.fcr.mon_tout, p);
STREAM_TO_UINT16 (cfg_info.fcr.mps, p);
break;
case L2CAP_CFG_TYPE_FCS:
cfg_info.fcs_present = TRUE;
STREAM_TO_UINT8 (cfg_info.fcs, p);
break;
case L2CAP_CFG_TYPE_EXT_FLOW:
cfg_info.ext_flow_spec_present = TRUE;
STREAM_TO_UINT8 (cfg_info.ext_flow_spec.id, p);
STREAM_TO_UINT8 (cfg_info.ext_flow_spec.stype, p);
STREAM_TO_UINT16 (cfg_info.ext_flow_spec.max_sdu_size, p);
STREAM_TO_UINT32 (cfg_info.ext_flow_spec.sdu_inter_time, p);
STREAM_TO_UINT32 (cfg_info.ext_flow_spec.access_latency, p);
STREAM_TO_UINT32 (cfg_info.ext_flow_spec.flush_timeout, p);
break;
}
}
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) {
if (p_ccb->local_id != id) {
L2CAP_TRACE_WARNING ("L2CAP - cfg rsp - bad ID. Exp: %d Got: %d",
p_ccb->local_id, id);
break;
}
if ( (cfg_info.result == L2CAP_CFG_OK) || (cfg_info.result == L2CAP_CFG_PENDING) ) {
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP, &cfg_info);
} else {
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_CONFIG_RSP_NEG, &cfg_info);
}
} else {
L2CAP_TRACE_WARNING ("L2CAP - rcvd cfg rsp for unknown CID: 0x%04x", lcid);
}
break;
case L2CAP_CMD_DISC_REQ:
STREAM_TO_UINT16 (lcid, p);
STREAM_TO_UINT16 (rcid, p);
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) {
if (p_ccb->remote_cid == rcid) {
p_ccb->remote_id = id;
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_REQ, &con_info);
}
} else {
l2cu_send_peer_disc_rsp (p_lcb, id, lcid, rcid);
}
break;
case L2CAP_CMD_DISC_RSP:
STREAM_TO_UINT16 (rcid, p);
STREAM_TO_UINT16 (lcid, p);
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) != NULL) {
if ((p_ccb->remote_cid == rcid) && (p_ccb->local_id == id)) {
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DISCONNECT_RSP, &con_info);
}
}
break;
case L2CAP_CMD_ECHO_REQ:
l2cu_send_peer_echo_rsp (p_lcb, id, NULL, 0);
break;
case L2CAP_CMD_ECHO_RSP:
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_OK);
}
break;
case L2CAP_CMD_INFO_REQ:
STREAM_TO_UINT16 (info_type, p);
l2cu_send_peer_info_rsp (p_lcb, id, info_type);
break;
case L2CAP_CMD_INFO_RSP:
/* Stop the link connect timer if sent before L2CAP connection is up */
if (p_lcb->w4_info_rsp) {
btu_stop_timer (&p_lcb->info_timer_entry);
p_lcb->w4_info_rsp = FALSE;
}
STREAM_TO_UINT16 (info_type, p);
STREAM_TO_UINT16 (result, p);
p_lcb->info_rx_bits |= (1 << info_type);
if ( (info_type == L2CAP_EXTENDED_FEATURES_INFO_TYPE)
&& (result == L2CAP_INFO_RESP_RESULT_SUCCESS) ) {
STREAM_TO_UINT32( p_lcb->peer_ext_fea, p );
#if (L2CAP_NUM_FIXED_CHNLS > 0)
if (p_lcb->peer_ext_fea & L2CAP_EXTFEA_FIXED_CHNLS) {
l2cu_send_peer_info_req (p_lcb, L2CAP_FIXED_CHANNELS_INFO_TYPE);
break;
} else {
l2cu_process_fixed_chnl_resp (p_lcb);
}
#endif
}
#if (L2CAP_NUM_FIXED_CHNLS > 0)
if (info_type == L2CAP_FIXED_CHANNELS_INFO_TYPE) {
if (result == L2CAP_INFO_RESP_RESULT_SUCCESS) {
memcpy (p_lcb->peer_chnl_mask, p, L2CAP_FIXED_CHNL_ARRAY_SIZE);
}
l2cu_process_fixed_chnl_resp (p_lcb);
}
#endif
#if (L2CAP_UCD_INCLUDED == TRUE)
else if (info_type == L2CAP_CONNLESS_MTU_INFO_TYPE) {
if (result == L2CAP_INFO_RESP_RESULT_SUCCESS) {
STREAM_TO_UINT16 (p_lcb->ucd_mtu, p);
}
}
#endif
ci.status = HCI_SUCCESS;
memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
}
break;
default:
L2CAP_TRACE_WARNING ("L2CAP - bad cmd code: %d", cmd_code);
l2cu_send_peer_cmd_reject (p_lcb, L2CAP_CMD_REJ_NOT_UNDERSTOOD, id, 0, 0);
return;
}
}
UNUSED(rej_mtu);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
/*******************************************************************************
**
** Function l2c_process_held_packets
**
** Description This function processes any L2CAP packets that arrived before
** the HCI connection complete arrived. It is a work around for
** badly behaved controllers.
**
** Returns void
**
*******************************************************************************/
void l2c_process_held_packets(BOOLEAN timed_out)
{
if (list_is_empty(l2cb.rcv_pending_q)) {
return;
}
if (!timed_out) {
btu_stop_timer(&l2cb.rcv_hold_tle);
L2CAP_TRACE_WARNING("L2CAP HOLD CONTINUE");
} else {
L2CAP_TRACE_WARNING("L2CAP HOLD TIMEOUT");
}
for (const list_node_t *node = list_begin(l2cb.rcv_pending_q);
node != list_end(l2cb.rcv_pending_q);) {
BT_HDR *p_buf = list_node(node);
node = list_next(node);
if (!timed_out || (!p_buf->layer_specific) || (--p_buf->layer_specific == 0)) {
list_remove(l2cb.rcv_pending_q, p_buf);
p_buf->layer_specific = 0xFFFF;
l2c_rcv_acl_data(p_buf);
}
}
/* If anyone still in the queue, restart the timeout */
if (!list_is_empty(l2cb.rcv_pending_q)) {
btu_start_timer (&l2cb.rcv_hold_tle, BTU_TTYPE_L2CAP_HOLD, BT_1SEC_TIMEOUT);
}
}
/*******************************************************************************
**
** Function l2c_init
**
** Description This function is called once at startup to initialize
** all the L2CAP structures
**
** Returns void
**
*******************************************************************************/
void l2c_init (void)
{
#if L2C_DYNAMIC_MEMORY
l2c_cb_ptr = (tL2C_CB *)osi_malloc(sizeof(tL2C_CB));
#endif /* #if L2C_DYNAMIC_MEMORY */
memset (&l2cb, 0, sizeof (tL2C_CB));
/* the psm is increased by 2 before being used */
l2cb.dyn_psm = 0xFFF;
l2cb.p_ccb_pool = list_new(osi_free_func);
if (l2cb.p_ccb_pool == NULL) {
L2CAP_TRACE_ERROR("%s unable to allocate memory for L2CAP channel control block", __func__);
}
l2cb.p_lcb_pool = list_new(osi_free_func);
if (l2cb.p_lcb_pool == NULL) {
L2CAP_TRACE_ERROR("%s unable to allocate memory for L2CAP Link control block", __func__);
}
#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
/* it will be set to L2CAP_PKT_START_NON_FLUSHABLE if controller supports */
l2cb.non_flushable_pbf = L2CAP_PKT_START << L2CAP_PKT_TYPE_SHIFT;
#endif
#ifdef L2CAP_DESIRED_LINK_ROLE
l2cb.desire_role = L2CAP_DESIRED_LINK_ROLE;
#else
l2cb.desire_role = HCI_ROLE_SLAVE;
#endif
/* Set the default idle timeout */
l2cb.idle_timeout = L2CAP_LINK_INACTIVITY_TOUT;
#if defined(L2CAP_INITIAL_TRACE_LEVEL)
l2cb.l2cap_trace_level = L2CAP_INITIAL_TRACE_LEVEL;
#else
l2cb.l2cap_trace_level = BT_TRACE_LEVEL_NONE; /* No traces */
#endif
#if L2CAP_CONFORMANCE_TESTING == TRUE
/* Conformance testing needs a dynamic response */
l2cb.test_info_resp = L2CAP_EXTFEA_SUPPORTED_MASK;
#endif
/* Number of ACL buffers to use for high priority channel */
#if (defined(L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE) && (L2CAP_HIGH_PRI_CHAN_QUOTA_IS_CONFIGURABLE == TRUE))
l2cb.high_pri_min_xmit_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA;
#endif
#if BLE_INCLUDED == TRUE
l2cb.l2c_ble_fixed_chnls_mask =
L2CAP_FIXED_CHNL_ATT_BIT | L2CAP_FIXED_CHNL_BLE_SIG_BIT | L2CAP_FIXED_CHNL_SMP_BIT;
#endif
l2cb.rcv_pending_q = list_new(NULL);
if (l2cb.rcv_pending_q == NULL) {
L2CAP_TRACE_ERROR("%s unable to allocate memory for link layer control block", __func__);
}
#if BLE_INCLUDED == TRUE
l2ble_update_att_acl_pkt_num(L2CA_BUFF_INI, NULL);
#endif
}
void l2c_free_p_lcb_pool(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) {
l2cu_release_lcb (p_lcb);
}
}
list_free(l2cb.p_lcb_pool);
}
void l2c_free_p_ccb_pool(void)
{
list_node_t *p_node = NULL;
tL2C_CCB *p_ccb = NULL;
for (p_node = list_begin(l2cb.p_ccb_pool); p_node; p_node = list_next(p_node)) {
p_ccb = list_node(p_node);
if (p_ccb) {
l2cu_release_ccb (p_ccb);
}
}
list_free(l2cb.p_ccb_pool);
}
void l2c_free(void)
{
list_free(l2cb.rcv_pending_q);
l2cb.rcv_pending_q = NULL;
l2c_free_p_lcb_pool();
l2c_free_p_ccb_pool();
#if L2C_DYNAMIC_MEMORY
FREE_AND_RESET(l2c_cb_ptr);
#endif
#if BLE_INCLUDED == TRUE
l2ble_update_att_acl_pkt_num(L2CA_BUFF_DEINIT, NULL);
#endif
}
/*******************************************************************************
**
** Function l2c_process_timeout
**
** Description This function is called when an L2CAP-related timeout occurs
**
** Returns void
**
*******************************************************************************/
void l2c_process_timeout (TIMER_LIST_ENT *p_tle)
{
/* What type of timeout ? */
switch (p_tle->event) {
case BTU_TTYPE_L2CAP_LINK:
l2c_link_timeout ((tL2C_LCB *)p_tle->param);
break;
#if (CLASSIC_BT_INCLUDED == TRUE)
case BTU_TTYPE_L2CAP_CHNL:
l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_TIMEOUT, NULL);
break;
case BTU_TTYPE_L2CAP_FCR_ACK:
l2c_csm_execute (((tL2C_CCB *)p_tle->param), L2CEVT_ACK_TIMEOUT, NULL);
break;
#endif ///CLASSIC_BT_INCLUDED == TRUE
case BTU_TTYPE_L2CAP_HOLD:
/* Update the timeouts in the hold queue */
l2c_process_held_packets(TRUE);
break;
case BTU_TTYPE_L2CAP_INFO:
l2c_info_timeout((tL2C_LCB *)p_tle->param);
break;
case BTU_TTYPE_L2CAP_UPDA_CONN_PARAMS: {
#if (BLE_INCLUDED == TRUE)
UINT8 status = HCI_ERR_HOST_TIMEOUT;
tL2C_LCB *p_lcb = (tL2C_LCB *)p_tle->param;
if (p_lcb){
p_lcb->conn_update_mask &= ~L2C_BLE_UPDATE_PENDING;
p_lcb->conn_update_mask &= ~L2C_BLE_UPDATE_PARAM_FULL;
l2c_send_update_conn_params_cb(p_lcb, status);
}
#endif ///BLE_INCLUDED == TRUE
break;
}
}
}
/*******************************************************************************
**
** Function l2c_data_write
**
** Description API functions call this function to write data.
**
** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE
** L2CAP_DW_CONGESTED, if data accepted and the channel is congested
** L2CAP_DW_FAILED, if error
**
*******************************************************************************/
#if (CLASSIC_BT_INCLUDED == TRUE)
UINT8 l2c_data_write (UINT16 cid, BT_HDR *p_data, UINT16 flags)
{
tL2C_CCB *p_ccb;
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_DataWrite, CID: %d", cid);
osi_free (p_data);
return (L2CAP_DW_FAILED);
}
#ifndef TESTER /* Tester may send any amount of data. otherwise sending message
bigger than mtu size of peer is a violation of protocol */
if (p_data->len > p_ccb->peer_cfg.mtu) {
L2CAP_TRACE_WARNING ("L2CAP - CID: 0x%04x cannot send message bigger than peer's mtu size", cid);
osi_free (p_data);
return (L2CAP_DW_FAILED);
}
#endif
/* channel based, packet based flushable or non-flushable */
p_data->layer_specific = flags;
/* If already congested, do not accept any more packets */
if (p_ccb->cong_sent) {
L2CAP_TRACE_DEBUG ("L2CAP - CID: 0x%04x cannot send, already congested xmit_hold_q.count: %u buff_quota: %u",
p_ccb->local_cid,
fixed_queue_length(p_ccb->xmit_hold_q),
p_ccb->buff_quota);
osi_free (p_data);
return (L2CAP_DW_FAILED);
}
//counter_add("l2cap.dyn.tx.bytes", p_data->len);
//counter_add("l2cap.dyn.tx.pkts", 1);
l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data);
if (p_ccb->cong_sent) {
return (L2CAP_DW_CONGESTED);
}
return (L2CAP_DW_SUCCESS);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
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