/****************************************************************************** * * 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 L2CAP UCD code * ******************************************************************************/ #include #include #include #include "bt_common.h" #include "bt_types.h" #include "btm_api.h" #include "btm_int.h" #include "btu.h" #include "hcidefs.h" #include "hcimsgs.h" #include "l2c_int.h" #include "l2cdefs.h" #if (L2CAP_UCD_INCLUDED == TRUE) static bool l2c_ucd_connect(const RawAddress& rem_bda); /******************************************************************************* * * Function l2c_ucd_discover_cback * * Description UCD Discover callback * * Returns void * ******************************************************************************/ static void l2c_ucd_discover_cback(const RawAddress& rem_bda, uint8_t info_type, uint32_t data) { tL2C_RCB* p_rcb = &l2cb.rcb_pool[0]; uint16_t xx; L2CAP_TRACE_DEBUG("L2CAP - l2c_ucd_discover_cback"); for (xx = 0; xx < MAX_L2CAP_CLIENTS; xx++, p_rcb++) { if (p_rcb->in_use) { /* if this application is waiting UCD reception info */ if ((info_type == L2CAP_UCD_INFO_TYPE_RECEPTION) && (p_rcb->ucd.state & L2C_UCD_STATE_W4_RECEPTION)) { p_rcb->ucd.cb_info.pL2CA_UCD_Discover_Cb(rem_bda, info_type, data); p_rcb->ucd.state &= ~(L2C_UCD_STATE_W4_RECEPTION); } /* if this application is waiting UCD MTU info */ if ((info_type == L2CAP_UCD_INFO_TYPE_MTU) && (p_rcb->ucd.state & L2C_UCD_STATE_W4_MTU)) { p_rcb->ucd.cb_info.pL2CA_UCD_Discover_Cb(rem_bda, info_type, data); p_rcb->ucd.state &= ~(L2C_UCD_STATE_W4_MTU); } } } } /******************************************************************************* * * Function l2c_ucd_data_ind_cback * * Description UCD Data callback * * Returns void * ******************************************************************************/ static void l2c_ucd_data_ind_cback(const RawAddress& rem_bda, BT_HDR* p_buf) { uint8_t* p; uint16_t psm; tL2C_RCB* p_rcb; L2CAP_TRACE_DEBUG("L2CAP - l2c_ucd_data_ind_cback"); p = (uint8_t*)(p_buf + 1) + p_buf->offset; STREAM_TO_UINT16(psm, p) p_buf->offset += L2CAP_UCD_OVERHEAD; p_buf->len -= L2CAP_UCD_OVERHEAD; p_rcb = l2cu_find_rcb_by_psm(psm); if (p_rcb == NULL) { L2CAP_TRACE_ERROR("L2CAP - no RCB for l2c_ucd_data_ind_cback, PSM: 0x%04x", psm); osi_free(p_buf); } else { p_rcb->ucd.cb_info.pL2CA_UCD_Data_Cb(rem_bda, p_buf); } } /******************************************************************************* * * Function l2c_ucd_congestion_status_cback * * Description UCD Congestion Status callback * * Returns void * ******************************************************************************/ static void l2c_ucd_congestion_status_cback(const RawAddress& rem_bda, bool is_congested) { tL2C_RCB* p_rcb = &l2cb.rcb_pool[0]; uint16_t xx; L2CAP_TRACE_DEBUG("L2CAP - l2c_ucd_congestion_status_cback"); for (xx = 0; xx < MAX_L2CAP_CLIENTS; xx++, p_rcb++) { if ((p_rcb->in_use) && (p_rcb->ucd.state != L2C_UCD_STATE_UNUSED)) { if (p_rcb->ucd.cb_info.pL2CA_UCD_Congestion_Status_Cb) { L2CAP_TRACE_DEBUG( "L2CAP - Calling UCDCongestionStatus_Cb (%d), PSM=0x%04x, BDA: " "%08x%04x,", is_congested, p_rcb->psm, (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]); p_rcb->ucd.cb_info.pL2CA_UCD_Congestion_Status_Cb(rem_bda, is_congested); } } } } /******************************************************************************* * * Function l2c_ucd_disconnect_ind_cback * * Description UCD disconnect callback (Prevent to access null pointer) * * Returns void * ******************************************************************************/ static void l2c_ucd_disconnect_ind_cback(uint16_t cid, bool result) { /* do nothing */ } /******************************************************************************* * * Function l2c_ucd_config_ind_cback * * Description UCD config callback (This prevent to access null pointer) * * Returns void * ******************************************************************************/ static void l2c_ucd_config_ind_cback(uint16_t cid, tL2CAP_CFG_INFO* p_cfg) { /* do nothing */ } /******************************************************************************* * * Function l2c_ucd_config_cfm_cback * * Description UCD config callback (This prevent to access null pointer) * * Returns void * ******************************************************************************/ static void l2c_ucd_config_cfm_cback(uint16_t cid, tL2CAP_CFG_INFO* p_cfg) { /* do nothing */ } /******************************************************************************* * * Function L2CA_UcdRegister * * Description Register PSM on UCD. * * Parameters: tL2CAP_UCD_CB_INFO * * Return value: true if successs * ******************************************************************************/ bool L2CA_UcdRegister(uint16_t psm, tL2CAP_UCD_CB_INFO* p_cb_info) { tL2C_RCB* p_rcb; L2CAP_TRACE_API("L2CA_UcdRegister() PSM: 0x%04x", psm); if ((!p_cb_info->pL2CA_UCD_Discover_Cb) || (!p_cb_info->pL2CA_UCD_Data_Cb)) { L2CAP_TRACE_ERROR("L2CAP - no callback registering PSM(0x%04x) on UCD", psm); return (false); } p_rcb = l2cu_find_rcb_by_psm(psm); if (p_rcb == NULL) { L2CAP_TRACE_ERROR("L2CAP - no RCB for L2CA_UcdRegister, PSM: 0x%04x", psm); return (false); } p_rcb->ucd.state = L2C_UCD_STATE_W4_DATA; p_rcb->ucd.cb_info = *p_cb_info; /* check if master rcb is created for UCD */ p_rcb = l2cu_find_rcb_by_psm(L2C_UCD_RCB_ID); if (p_rcb == NULL) { p_rcb = l2cu_allocate_rcb(L2C_UCD_RCB_ID); if (p_rcb == NULL) { L2CAP_TRACE_ERROR("L2CAP - no RCB available for L2CA_UcdRegister"); return (false); } else { /* these callback functions will forward data to each UCD application */ p_rcb->ucd.cb_info.pL2CA_UCD_Discover_Cb = l2c_ucd_discover_cback; p_rcb->ucd.cb_info.pL2CA_UCD_Data_Cb = l2c_ucd_data_ind_cback; p_rcb->ucd.cb_info.pL2CA_UCD_Congestion_Status_Cb = l2c_ucd_congestion_status_cback; memset(&p_rcb->api, 0, sizeof(tL2CAP_APPL_INFO)); p_rcb->api.pL2CA_DisconnectInd_Cb = l2c_ucd_disconnect_ind_cback; /* This will make L2CAP check UCD congestion callback */ p_rcb->api.pL2CA_CongestionStatus_Cb = NULL; /* do nothing but prevent crash */ p_rcb->api.pL2CA_ConfigInd_Cb = l2c_ucd_config_ind_cback; p_rcb->api.pL2CA_ConfigCfm_Cb = l2c_ucd_config_cfm_cback; } } return (true); } /******************************************************************************* * * Function L2CA_UcdDeregister * * Description Deregister PSM on UCD. * * Parameters: PSM * * Return value: true if successs * ******************************************************************************/ bool L2CA_UcdDeregister(uint16_t psm) { tL2C_CCB* p_ccb; tL2C_RCB* p_rcb; uint16_t xx; L2CAP_TRACE_API("L2CA_UcdDeregister() PSM: 0x%04x", psm); p_rcb = l2cu_find_rcb_by_psm(psm); if (p_rcb == NULL) { L2CAP_TRACE_ERROR("L2CAP - no RCB for L2CA_UcdDeregister, PSM: 0x%04x", psm); return (false); } p_rcb->ucd.state = L2C_UCD_STATE_UNUSED; /* check this was the last UCD registration */ p_rcb = &l2cb.rcb_pool[0]; for (xx = 0; xx < MAX_L2CAP_CLIENTS; xx++, p_rcb++) { if ((p_rcb->in_use) && (p_rcb->ucd.state != L2C_UCD_STATE_UNUSED)) return (true); } /* delete master rcb for UCD */ p_rcb = l2cu_find_rcb_by_psm(L2C_UCD_RCB_ID); if (p_rcb != NULL) { l2cu_release_rcb(p_rcb); } /* delete CCB for UCD */ p_ccb = l2cb.ccb_pool; for (xx = 0; xx < MAX_L2CAP_CHANNELS; xx++) { if ((p_ccb->in_use) && (p_ccb->local_cid == L2CAP_CONNECTIONLESS_CID)) { l2cu_release_ccb(p_ccb); } p_ccb++; } return (true); } /******************************************************************************* * * Function L2CA_UcdDiscover * * Description Discover UCD of remote device. * * Parameters: PSM * BD_ADDR of remote device * info_type : L2CAP_UCD_INFO_TYPE_RECEPTION * L2CAP_UCD_INFO_TYPE_MTU * * * Return value: true if successs * ******************************************************************************/ bool L2CA_UcdDiscover(uint16_t psm, const RawAddress& rem_bda, uint8_t info_type) { tL2C_LCB* p_lcb; tL2C_CCB* p_ccb; tL2C_RCB* p_rcb; L2CAP_TRACE_API( "L2CA_UcdDiscover() PSM: 0x%04x BDA: %08x%04x, InfoType=0x%02x", psm, (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5], info_type); /* Fail if the PSM is not registered */ if (((p_rcb = l2cu_find_rcb_by_psm(psm)) == NULL) || (p_rcb->ucd.state == L2C_UCD_STATE_UNUSED)) { L2CAP_TRACE_WARNING("L2CAP - no RCB for L2CA_UcdDiscover, PSM: 0x%04x", psm); return (false); } /* First, see if we already have a link to the remote */ /* then find the channel control block for UCD. */ if (((p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_BR_EDR)) == NULL) || ((p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID)) == NULL)) { if (l2c_ucd_connect(rem_bda) == false) { return (false); } } /* set waiting flags in rcb */ if (info_type & L2CAP_UCD_INFO_TYPE_RECEPTION) p_rcb->ucd.state |= L2C_UCD_STATE_W4_RECEPTION; if (info_type & L2CAP_UCD_INFO_TYPE_MTU) p_rcb->ucd.state |= L2C_UCD_STATE_W4_MTU; /* if link is already established */ if ((p_lcb) && (p_lcb->link_state == LST_CONNECTED)) { if (!p_ccb) { p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID); } l2c_ucd_check_pending_info_req(p_ccb); } return (true); } /******************************************************************************* * * Function L2CA_UcdDataWrite * * Description Send UCD to remote device * * Parameters: PSM * BD Address of remote * Pointer to buffer of type BT_HDR * flags : L2CAP_FLUSHABLE_CH_BASED * L2CAP_FLUSHABLE_PKT * L2CAP_NON_FLUSHABLE_PKT * * Return value L2CAP_DW_SUCCESS, if data accepted * L2CAP_DW_FAILED, if error * ******************************************************************************/ uint16_t L2CA_UcdDataWrite(uint16_t psm, const RawAddress& rem_bda, BT_HDR* p_buf, uint16_t flags) { tL2C_LCB* p_lcb; tL2C_CCB* p_ccb; tL2C_RCB* p_rcb; uint8_t* p; L2CAP_TRACE_API( "L2CA_UcdDataWrite() PSM: 0x%04x BDA: %08x%04x", psm, (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]); /* Fail if the PSM is not registered */ if (((p_rcb = l2cu_find_rcb_by_psm(psm)) == NULL) || (p_rcb->ucd.state == L2C_UCD_STATE_UNUSED)) { L2CAP_TRACE_WARNING("L2CAP - no RCB for L2CA_UcdDataWrite, PSM: 0x%04x", psm); osi_free(p_buf); return (L2CAP_DW_FAILED); } /* First, see if we already have a link to the remote */ /* then find the channel control block for UCD */ if (((p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_BR_EDR)) == NULL) || ((p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID)) == NULL)) { if (l2c_ucd_connect(rem_bda) == false) { osi_free(p_buf); return (L2CAP_DW_FAILED); } /* If we still don't have lcb and ccb after connect attempt, then can't * proceed */ if (((p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_BR_EDR)) == NULL) || ((p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID)) == NULL)) { osi_free(p_buf); return (L2CAP_DW_FAILED); } } /* write PSM */ p_buf->offset -= L2CAP_UCD_OVERHEAD; p_buf->len += L2CAP_UCD_OVERHEAD; p = (uint8_t*)(p_buf + 1) + p_buf->offset; UINT16_TO_STREAM(p, psm); /* UCD MTU check */ if ((p_lcb->ucd_mtu) && (p_buf->len > p_lcb->ucd_mtu)) { L2CAP_TRACE_WARNING( "L2CAP - Handle: 0x%04x UCD bigger than peer's UCD mtu size cannot be " "sent", p_lcb->handle); osi_free(p_buf); return (L2CAP_DW_FAILED); } /* If already congested, do not accept any more packets */ if (p_ccb->cong_sent) { L2CAP_TRACE_ERROR( "L2CAP - Handle: 0x%04x UCD cannot be sent, already congested count: " "%u buff_quota: %u", p_lcb->handle, (fixed_queue_length(p_ccb->xmit_hold_q) + fixed_queue_length(p_lcb->ucd_out_sec_pending_q)), p_ccb->buff_quota); osi_free(p_buf); return (L2CAP_DW_FAILED); } /* channel based, packet based flushable or non-flushable */ p_buf->layer_specific = flags; l2c_csm_execute(p_ccb, L2CEVT_L2CA_DATA_WRITE, p_buf); if (p_ccb->cong_sent) return (L2CAP_DW_CONGESTED); else return (L2CAP_DW_SUCCESS); } /******************************************************************************* * * Function L2CA_UcdSetIdleTimeout * * Description Set UCD Idle timeout. * * Parameters: BD Addr * Timeout in second * * Return value: true if successs * ******************************************************************************/ bool L2CA_UcdSetIdleTimeout(const RawAddress& rem_bda, uint16_t timeout) { tL2C_LCB* p_lcb; tL2C_CCB* p_ccb; L2CAP_TRACE_API( "L2CA_UcdSetIdleTimeout() Timeout: 0x%04x BDA: %08x%04x", timeout, (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]); /* First, see if we already have a link to the remote */ /* then find the channel control block. */ if (((p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_BR_EDR)) == NULL) || ((p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID)) == NULL)) { L2CAP_TRACE_WARNING("L2CAP - no UCD channel"); return (false); } else { p_ccb->fixed_chnl_idle_tout = timeout; return (true); } } /******************************************************************************* * * Function L2CA_UCDSetTxPriority * * Description Sets the transmission priority for a connectionless channel. * * Returns true if a valid channel, else false * ******************************************************************************/ bool L2CA_UCDSetTxPriority(const RawAddress& rem_bda, tL2CAP_CHNL_PRIORITY priority) { tL2C_LCB* p_lcb; tL2C_CCB* p_ccb; L2CAP_TRACE_API( "L2CA_UCDSetTxPriority() priority: 0x%02x BDA: %08x%04x", priority, (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]); p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_BR_EDR); if (p_lcb == NULL) { L2CAP_TRACE_WARNING("L2CAP - no LCB for L2CA_UCDSetTxPriority"); return (false); } /* Find the channel control block */ p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID); if (p_ccb == NULL) { L2CAP_TRACE_WARNING("L2CAP - no CCB for L2CA_UCDSetTxPriority"); return (false); } /* it will update the order of CCB in LCB by priority and update round robin * service variables */ l2cu_change_pri_ccb(p_ccb, priority); return (true); } /******************************************************************************* * * Function l2c_ucd_connect * * Description Connect UCD to remote device. * * Parameters: BD_ADDR of remote device * * Return value: true if successs * ******************************************************************************/ static bool l2c_ucd_connect(const RawAddress& rem_bda) { tL2C_LCB* p_lcb; tL2C_CCB* p_ccb; tL2C_RCB* p_rcb; L2CAP_TRACE_DEBUG( "l2c_ucd_connect() BDA: %08x%04x", (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]); /* Fail if we have not established communications with the controller */ if (!BTM_IsDeviceUp()) { L2CAP_TRACE_WARNING("l2c_ucd_connect - BTU not ready"); return (false); } /* First, see if we already have a link to the remote */ p_lcb = l2cu_find_lcb_by_bd_addr(rem_bda, BT_TRANSPORT_BR_EDR); if (p_lcb == NULL) { /* No link. Get an LCB and start link establishment */ if (((p_lcb = l2cu_allocate_lcb(rem_bda, false, BT_TRANSPORT_BR_EDR)) == NULL) || (l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR) == false)) { L2CAP_TRACE_WARNING("L2CAP - conn not started l2c_ucd_connect"); return (false); } } else if (p_lcb->info_rx_bits & (1 << L2CAP_EXTENDED_FEATURES_INFO_TYPE)) { if (!(p_lcb->peer_ext_fea & L2CAP_EXTFEA_UCD_RECEPTION)) { L2CAP_TRACE_WARNING( "L2CAP - UCD is not supported by peer, l2c_ucd_connect"); return (false); } } /* Find the channel control block. */ p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID); if (p_ccb == NULL) { /* Allocate a channel control block */ p_ccb = l2cu_allocate_ccb(p_lcb, 0); if (p_ccb == NULL) { L2CAP_TRACE_WARNING("L2CAP - no CCB for l2c_ucd_connect"); return (false); } else { /* Set CID for the connection */ p_ccb->local_cid = L2CAP_CONNECTIONLESS_CID; p_ccb->remote_cid = L2CAP_CONNECTIONLESS_CID; /* Set the default idle timeout value to use */ p_ccb->fixed_chnl_idle_tout = L2CAP_UCD_IDLE_TIMEOUT; /* Set the default channel priority value to use */ l2cu_change_pri_ccb(p_ccb, L2CAP_UCD_CH_PRIORITY); p_rcb = l2cu_find_rcb_by_psm(L2C_UCD_RCB_ID); if (p_rcb == NULL) { L2CAP_TRACE_WARNING("L2CAP - no UCD registered, l2c_ucd_connect"); return (false); } /* Save UCD registration info */ p_ccb->p_rcb = p_rcb; /* There is no configuration, so if the link is up, the channel is up */ if (p_lcb->link_state == LST_CONNECTED) { p_ccb->chnl_state = CST_OPEN; } } } return (true); } /******************************************************************************* * * Function l2c_ucd_delete_sec_pending_q * * Description discard all of UCD packets in security pending queue * * Returns None * ******************************************************************************/ void l2c_ucd_delete_sec_pending_q(tL2C_LCB* p_lcb) { /* clean up any security pending UCD */ while (!fixed_queue_is_empty(p_lcb->ucd_out_sec_pending_q)) osi_free(fixed_queue_try_dequeue(p_lcb->ucd_out_sec_pending_q)); fixed_queue_free(p_lcb->ucd_out_sec_pending_q, NULL); p_lcb->ucd_out_sec_pending_q = NULL; while (!fixed_queue_is_empty(p_lcb->ucd_in_sec_pending_q)) osi_free(fixed_queue_try_dequeue(p_lcb->ucd_in_sec_pending_q)); fixed_queue_free(p_lcb->ucd_in_sec_pending_q); p_lcb->ucd_in_sec_pending_q = NULL; } /******************************************************************************* * * Function l2c_ucd_check_pending_info_req * * Description check if any application is waiting for UCD information * * Return true if any pending UCD info request * ******************************************************************************/ bool l2c_ucd_check_pending_info_req(tL2C_CCB* p_ccb) { tL2C_RCB* p_rcb = &l2cb.rcb_pool[0]; uint16_t xx; bool pending = false; if (p_ccb == NULL) { L2CAP_TRACE_ERROR("L2CAP - NULL p_ccb in l2c_ucd_check_pending_info_req"); return (false); } for (xx = 0; xx < MAX_L2CAP_CLIENTS; xx++, p_rcb++) { if (p_rcb->in_use) { /* if application is waiting UCD reception info */ if (p_rcb->ucd.state & L2C_UCD_STATE_W4_RECEPTION) { /* if this information is available */ if (p_ccb->p_lcb->info_rx_bits & (1 << L2CAP_EXTENDED_FEATURES_INFO_TYPE)) { if (!(p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_UCD_RECEPTION)) { L2CAP_TRACE_WARNING( "L2CAP - UCD is not supported by peer, " "l2c_ucd_check_pending_info_req"); l2c_ucd_delete_sec_pending_q(p_ccb->p_lcb); l2cu_release_ccb(p_ccb); } p_ccb->p_rcb->ucd.cb_info.pL2CA_UCD_Discover_Cb( p_ccb->p_lcb->remote_bd_addr, L2CAP_UCD_INFO_TYPE_RECEPTION, p_ccb->p_lcb->peer_ext_fea & L2CAP_EXTFEA_UCD_RECEPTION); } else { pending = true; if (p_ccb->p_lcb->w4_info_rsp == false) { l2cu_send_peer_info_req(p_ccb->p_lcb, L2CAP_EXTENDED_FEATURES_INFO_TYPE); } } } /* if application is waiting for UCD MTU */ if (p_rcb->ucd.state & L2C_UCD_STATE_W4_MTU) { /* if this information is available */ if (p_ccb->p_lcb->info_rx_bits & (1 << L2CAP_CONNLESS_MTU_INFO_TYPE)) { p_ccb->p_rcb->ucd.cb_info.pL2CA_UCD_Discover_Cb( p_ccb->p_lcb->remote_bd_addr, L2CAP_UCD_INFO_TYPE_MTU, p_ccb->p_lcb->ucd_mtu); } else { pending = true; if (p_ccb->p_lcb->w4_info_rsp == false) { l2cu_send_peer_info_req(p_ccb->p_lcb, L2CAP_CONNLESS_MTU_INFO_TYPE); } } } } } return (pending); } /******************************************************************************* * * Function l2c_ucd_enqueue_pending_out_sec_q * * Description enqueue outgoing UCD packet into security pending queue * and check congestion * * Return None * ******************************************************************************/ void l2c_ucd_enqueue_pending_out_sec_q(tL2C_CCB* p_ccb, void* p_data) { fixed_queue_enqueue(p_ccb->p_lcb->ucd_out_sec_pending_q, p_data); l2cu_check_channel_congestion(p_ccb); } /******************************************************************************* * * Function l2c_ucd_check_pending_out_sec_q * * Description check outgoing security * * Return true if any UCD packet for security * ******************************************************************************/ bool l2c_ucd_check_pending_out_sec_q(tL2C_CCB* p_ccb) { BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_peek_first(p_ccb->p_lcb->ucd_out_sec_pending_q); if (p_buf != NULL) { uint16_t psm; uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset; STREAM_TO_UINT16(psm, p) p_ccb->chnl_state = CST_ORIG_W4_SEC_COMP; btm_sec_l2cap_access_req(p_ccb->p_lcb->remote_bd_addr, psm, p_ccb->p_lcb->handle, CONNLESS_ORIG, &l2c_link_sec_comp, p_ccb); return (true); } return (false); } /******************************************************************************* * * Function l2c_ucd_send_pending_out_sec_q * * Description dequeue UCD packet from security pending queue and * enqueue it into CCB * * Return None * ******************************************************************************/ void l2c_ucd_send_pending_out_sec_q(tL2C_CCB* p_ccb) { BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->p_lcb->ucd_out_sec_pending_q); if (p_buf != NULL) { l2c_enqueue_peer_data(p_ccb, (BT_HDR*)p_buf); l2c_link_check_send_pkts(p_ccb->p_lcb, NULL, NULL); } } /******************************************************************************* * * Function l2c_ucd_discard_pending_out_sec_q * * Description dequeue UCD packet from security pending queue and * discard it. * * Return None * ******************************************************************************/ void l2c_ucd_discard_pending_out_sec_q(tL2C_CCB* p_ccb) { BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->p_lcb->ucd_out_sec_pending_q); /* we may need to report to application */ osi_free(p_buf); } /******************************************************************************* * * Function l2c_ucd_check_pending_in_sec_q * * Description check incoming security * * Return true if any UCD packet for security * ******************************************************************************/ bool l2c_ucd_check_pending_in_sec_q(tL2C_CCB* p_ccb) { BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->p_lcb->ucd_in_sec_pending_q); if (p_buf != NULL) { uint16_t psm; uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset; STREAM_TO_UINT16(psm, p) p_ccb->chnl_state = CST_TERM_W4_SEC_COMP; btm_sec_l2cap_access_req(p_ccb->p_lcb->remote_bd_addr, psm, p_ccb->p_lcb->handle, CONNLESS_TERM, &l2c_link_sec_comp, p_ccb); return (true); } return (false); } /******************************************************************************* * * Function l2c_ucd_send_pending_in_sec_q * * Description dequeue UCD packet from security pending queue and * send it to application * * Return None * ******************************************************************************/ void l2c_ucd_send_pending_in_sec_q(tL2C_CCB* p_ccb) { BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->p_lcb->ucd_in_sec_pending_q) if (p_buf != NULL) { p_ccb->p_rcb->ucd.cb_info.pL2CA_UCD_Data_Cb(p_ccb->p_lcb->remote_bd_addr, (BT_HDR*)p_buf); } } /******************************************************************************* * * Function l2c_ucd_discard_pending_in_sec_q * * Description dequeue UCD packet from security pending queue and * discard it. * * Return None * ******************************************************************************/ void l2c_ucd_discard_pending_in_sec_q(tL2C_CCB* p_ccb) { BT_HDR* p_buf = (BT_HDR*)fixed_queue_try_dequeue(p_ccb->p_lcb->ucd_in_sec_pending_q); osi_free(p_buf); } /******************************************************************************* * * Function l2c_ucd_check_rx_pkts * * Description Check if UCD reception is registered. * Process received UCD packet if application is expecting. * * Return true if UCD reception is registered * ******************************************************************************/ bool l2c_ucd_check_rx_pkts(tL2C_LCB* p_lcb, BT_HDR* p_msg) { tL2C_CCB* p_ccb; tL2C_RCB* p_rcb; if (((p_ccb = l2cu_find_ccb_by_cid(p_lcb, L2CAP_CONNECTIONLESS_CID)) != NULL) || ((p_rcb = l2cu_find_rcb_by_psm(L2C_UCD_RCB_ID)) != NULL)) { if (p_ccb == NULL) { /* Allocate a channel control block */ p_ccb = l2cu_allocate_ccb(p_lcb, 0); if (p_ccb == NULL) { L2CAP_TRACE_WARNING("L2CAP - no CCB for UCD reception"); osi_free(p_msg); return true; } else { /* Set CID for the connection */ p_ccb->local_cid = L2CAP_CONNECTIONLESS_CID; p_ccb->remote_cid = L2CAP_CONNECTIONLESS_CID; /* Set the default idle timeout value to use */ p_ccb->fixed_chnl_idle_tout = L2CAP_UCD_IDLE_TIMEOUT; /* Set the default channel priority value to use */ l2cu_change_pri_ccb(p_ccb, L2CAP_UCD_CH_PRIORITY); /* Save registration info */ p_ccb->p_rcb = p_rcb; p_ccb->chnl_state = CST_OPEN; } } l2c_csm_execute(p_ccb, L2CEVT_L2CAP_DATA, p_msg); return true; } else return false; } /******************************************************************************* * * Function l2c_ucd_process_event * * Description This is called from main state machine when LCID is * connectionless. Process the event if it is for UCD. * * Return true if the event is consumed by UCD * false if the event needs to be processed by the main state * machine * ******************************************************************************/ bool l2c_ucd_process_event(tL2C_CCB* p_ccb, uint16_t event, void* p_data) { /* if the event is not processed by this function, this variable will be set * to false */ bool done = true; switch (p_ccb->chnl_state) { case CST_CLOSED: switch (event) { case L2CEVT_LP_CONNECT_CFM: /* Link came up */ /* check if waiting for UCD info */ if (!l2c_ucd_check_pending_info_req(p_ccb)) { /* check if any outgoing UCD packet is waiting security check */ if (!l2c_ucd_check_pending_out_sec_q(p_ccb)) { p_ccb->chnl_state = CST_OPEN; } } break; case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */ fixed_queue_enqueue(p_ccb->p_lcb->ucd_in_sec_pending_q, p_data); break; case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */ l2c_ucd_enqueue_pending_out_sec_q(p_ccb, p_data); break; case L2CEVT_L2CAP_INFO_RSP: /* check if waiting for UCD info */ if (!l2c_ucd_check_pending_info_req(p_ccb)) { /* check if any outgoing UCD packet is waiting security check */ if (!l2c_ucd_check_pending_out_sec_q(p_ccb)) { p_ccb->chnl_state = CST_OPEN; } } break; default: done = false; /* main state machine continues to process event */ break; } break; case CST_ORIG_W4_SEC_COMP: switch (event) { case L2CEVT_SEC_RE_SEND_CMD: /* BTM has enough info to proceed */ /* check if any outgoing UCD packet is waiting security check */ if (!l2c_ucd_check_pending_out_sec_q(p_ccb)) { p_ccb->chnl_state = CST_OPEN; } break; case L2CEVT_SEC_COMP: /* Security completed success */ p_ccb->chnl_state = CST_OPEN; l2c_ucd_send_pending_out_sec_q(p_ccb); if (!fixed_queue_is_empty(p_ccb->p_lcb->ucd_out_sec_pending_q)) { /* start a timer to send next UCD packet in OPEN state */ /* it will prevent stack overflow */ alarm_set_on_mloop(p_ccb->l2c_ccb_timer, 0, l2c_ccb_timer_timeout, p_ccb); } else { /* start a timer for idle timeout of UCD */ period_ms_t timeout_ms = p_ccb->fixed_chnl_idle_tout * 1000; alarm_set_on_mloop(p_ccb->l2c_ccb_timer, timeout_ms, l2c_ccb_timer_timeout, p_ccb); } break; case L2CEVT_SEC_COMP_NEG: p_ccb->chnl_state = CST_OPEN; l2c_ucd_discard_pending_out_sec_q(p_ccb); /* start a timer for idle timeout of UCD */ period_ms_t timeout_ms = p_ccb->fixed_chnl_idle_tout * 1000; alarm_set_on_mloop(p_ccb->l2c_ccb_timer, timeout_ms, l2c_ccb_timer_timeout, p_ccb); break; case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */ l2c_ucd_enqueue_pending_out_sec_q(p_ccb, p_data); break; case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */ fixed_queue_enqueue(p_ccb->p_lcb->ucd_in_sec_pending_q, p_data); break; case L2CEVT_L2CAP_INFO_RSP: /* check if waiting for UCD info */ l2c_ucd_check_pending_info_req(p_ccb); break; default: done = false; /* main state machine continues to process event */ break; } break; case CST_TERM_W4_SEC_COMP: switch (event) { case L2CEVT_SEC_COMP: p_ccb->chnl_state = CST_OPEN; l2c_ucd_send_pending_in_sec_q(p_ccb); if (!fixed_queue_is_empty(p_ccb->p_lcb->ucd_in_sec_pending_q)) { /* start a timer to check next UCD packet in OPEN state */ /* it will prevent stack overflow */ alarm_set_on_mloop(p_ccb->l2c_ccb_timer, 0, l2c_ccb_timer_timeout, p_ccb); } else { /* start a timer for idle timeout of UCD */ period_ms_t timeout_ms = p_ccb->fixed_chnl_idle_tout * 1000; alarm_set_on_mloop(p_ccb->l2c_ccb_timer, timeout_ms, l2c_ccb_timer_timeout, p_ccb); } break; case L2CEVT_SEC_COMP_NEG: if (((tL2C_CONN_INFO*)p_data)->status == BTM_DELAY_CHECK) { done = false; break; } p_ccb->chnl_state = CST_OPEN; l2c_ucd_discard_pending_in_sec_q(p_ccb); /* start a timer for idle timeout of UCD */ period_ms_t timeout_ms = p_ccb->fixed_chnl_idle_tout * 1000; alarm_set_on_mloop(p_ccb->l2c_ccb_timer, timeout_ms, l2c_ccb_timer_timeout, p_ccb); break; case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */ l2c_ucd_enqueue_pending_out_sec_q(p_ccb, p_data); break; case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */ fixed_queue_enqueue(p_ccb->p_lcb->ucd_in_sec_pending_q, p_data); break; case L2CEVT_SEC_RE_SEND_CMD: /* BTM has enough info to proceed */ /* check if any incoming UCD packet is waiting security check */ if (!l2c_ucd_check_pending_in_sec_q(p_ccb)) { p_ccb->chnl_state = CST_OPEN; } break; case L2CEVT_L2CAP_INFO_RSP: /* check if waiting for UCD info */ l2c_ucd_check_pending_info_req(p_ccb); break; default: done = false; /* main state machine continues to process event */ break; } break; case CST_OPEN: switch (event) { case L2CEVT_L2CAP_DATA: /* Peer data packet rcvd */ /* stop idle timer of UCD */ alarm_cancel(p_ccb->l2c_ccb_timer); fixed_queue_enqueue(p_ccb->p_lcb->ucd_in_sec_pending_q, p_data); l2c_ucd_check_pending_in_sec_q(p_ccb); break; case L2CEVT_L2CA_DATA_WRITE: /* Upper layer data to send */ /* stop idle timer of UCD */ alarm_cancel(p_ccb->l2c_ccb_timer); l2c_ucd_enqueue_pending_out_sec_q(p_ccb, p_data); /* success changes state, failure stays in current state */ l2c_ucd_check_pending_out_sec_q(p_ccb); break; case L2CEVT_TIMEOUT: /* check if any UCD packet is waiting security check */ if ((!l2c_ucd_check_pending_in_sec_q(p_ccb)) && (!l2c_ucd_check_pending_out_sec_q(p_ccb))) { l2cu_release_ccb(p_ccb); } break; case L2CEVT_L2CAP_INFO_RSP: /* check if waiting for UCD info */ l2c_ucd_check_pending_info_req(p_ccb); break; default: done = false; /* main state machine continues to process event */ break; } break; default: done = false; /* main state machine continues to process event */ break; } return done; } #endif /* (L2CAP_UCD_INCLUDED == TRUE) */