/****************************************************************************** * * 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 API code * ******************************************************************************/ #define LOG_TAG "bt_l2cap" #include #include #include #include #include "gki.h" #include "bt_types.h" #include "btcore/include/counter.h" #include "hcidefs.h" #include "hcimsgs.h" #include "l2cdefs.h" #include "l2c_int.h" #include "btu.h" #include "btm_api.h" #include "osi/include/allocator.h" #include "osi/include/log.h" /******************************************************************************* ** ** Function L2CA_Register ** ** Description Other layers call this function to register for L2CAP ** services. ** ** Returns PSM to use or zero if error. Typically, the PSM returned ** is the same as was passed in, but for an outgoing-only ** connection to a dynamic PSM, a "virtual" PSM is returned ** and should be used in the calls to L2CA_ConnectReq(), ** L2CA_ErtmConnectReq() and L2CA_Deregister() ** *******************************************************************************/ UINT16 L2CA_Register (UINT16 psm, tL2CAP_APPL_INFO *p_cb_info) { tL2C_RCB *p_rcb; UINT16 vpsm = psm; L2CAP_TRACE_API ("L2CAP - L2CA_Register() called for PSM: 0x%04x", psm); /* Verify that the required callback info has been filled in ** Note: Connection callbacks are required but not checked ** for here because it is possible to be only a client ** or only a server. */ if ((!p_cb_info->pL2CA_ConfigCfm_Cb) || (!p_cb_info->pL2CA_ConfigInd_Cb) || (!p_cb_info->pL2CA_DataInd_Cb) || (!p_cb_info->pL2CA_DisconnectInd_Cb)) { L2CAP_TRACE_ERROR ("L2CAP - no cb registering PSM: 0x%04x", psm); return (0); } /* Verify PSM is valid */ if (L2C_INVALID_PSM(psm)) { L2CAP_TRACE_ERROR ("L2CAP - invalid PSM value, PSM: 0x%04x", psm); return (0); } /* Check if this is a registration for an outgoing-only connection to */ /* a dynamic PSM. If so, allocate a "virtual" PSM for the app to use. */ if ( (psm >= 0x1001) && (p_cb_info->pL2CA_ConnectInd_Cb == NULL) ) { for (vpsm = 0x1002; vpsm < 0x8000; vpsm += 2) { if ((p_rcb = l2cu_find_rcb_by_psm (vpsm)) == NULL) break; } L2CAP_TRACE_API ("L2CA_Register - Real PSM: 0x%04x Virtual PSM: 0x%04x", psm, vpsm); } /* If registration block already there, just overwrite it */ if ((p_rcb = l2cu_find_rcb_by_psm (vpsm)) == NULL) { if ((p_rcb = l2cu_allocate_rcb (vpsm)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no RCB available, PSM: 0x%04x vPSM: 0x%04x", psm, vpsm); return (0); } } p_rcb->api = *p_cb_info; p_rcb->real_psm = psm; return (vpsm); } /******************************************************************************* ** ** Function L2CA_Deregister ** ** Description Other layers call this function to de-register for L2CAP ** services. ** ** Returns void ** *******************************************************************************/ void L2CA_Deregister (UINT16 psm) { tL2C_RCB *p_rcb; tL2C_CCB *p_ccb; tL2C_LCB *p_lcb; int ii; L2CAP_TRACE_API ("L2CAP - L2CA_Deregister() called for PSM: 0x%04x", psm); if ((p_rcb = l2cu_find_rcb_by_psm (psm)) != NULL) { p_lcb = &l2cb.lcb_pool[0]; for (ii = 0; ii < MAX_L2CAP_LINKS; ii++, p_lcb++) { if (p_lcb->in_use) { if (((p_ccb = p_lcb->ccb_queue.p_first_ccb) == NULL) || (p_lcb->link_state == LST_DISCONNECTING)) continue; if ((p_ccb->in_use) && ((p_ccb->chnl_state == CST_W4_L2CAP_DISCONNECT_RSP) || (p_ccb->chnl_state == CST_W4_L2CA_DISCONNECT_RSP))) continue; if (p_ccb->p_rcb == p_rcb) l2c_csm_execute (p_ccb, L2CEVT_L2CA_DISCONNECT_REQ, NULL); } } l2cu_release_rcb (p_rcb); } else { L2CAP_TRACE_WARNING ("L2CAP - PSM: 0x%04x not found for deregistration", psm); } } /******************************************************************************* ** ** Function L2CA_AllocatePSM ** ** Description Other layers call this function to find an unused PSM for L2CAP ** services. ** ** Returns PSM to use. ** *******************************************************************************/ UINT16 L2CA_AllocatePSM(void) { BOOLEAN done = FALSE; UINT16 psm = l2cb.dyn_psm; L2CAP_TRACE_API( "L2CA_AllocatePSM"); while (!done) { psm += 2; if (psm > 0xfeff) { psm = 0x1001; } else if (psm & 0x0100) { /* the upper byte must be even */ psm += 0x0100; } /* if psm is in range of reserved BRCM Aware features */ if ((BRCM_RESERVED_PSM_START <= psm)&&(psm <= BRCM_RESERVED_PSM_END)) continue; /* make sure the newlly allocated psm is not used right now */ if ((l2cu_find_rcb_by_psm (psm)) == NULL) done = TRUE; } l2cb.dyn_psm = psm; return(psm); } /******************************************************************************* ** ** Function L2CA_ConnectReq ** ** Description Higher layers call this function to create an L2CAP connection. ** Note that the connection is not established at this time, but ** connection establishment gets started. The callback function ** will be invoked when connection establishes or fails. ** ** Returns the CID of the connection, or 0 if it failed to start ** *******************************************************************************/ UINT16 L2CA_ConnectReq (UINT16 psm, BD_ADDR p_bd_addr) { return L2CA_ErtmConnectReq (psm, p_bd_addr, NULL); } /******************************************************************************* ** ** Function L2CA_ErtmConnectReq ** ** Description Higher layers call this function to create an L2CAP connection. ** Note that the connection is not established at this time, but ** connection establishment gets started. The callback function ** will be invoked when connection establishes or fails. ** ** Parameters: PSM: L2CAP PSM for the connection ** BD address of the peer ** Enhaced retransmission mode configurations ** Returns the CID of the connection, or 0 if it failed to start ** *******************************************************************************/ UINT16 L2CA_ErtmConnectReq (UINT16 psm, BD_ADDR p_bd_addr, tL2CAP_ERTM_INFO *p_ertm_info) { tL2C_LCB *p_lcb; tL2C_CCB *p_ccb; tL2C_RCB *p_rcb; counter_add("l2cap.conn.req", 1); L2CAP_TRACE_API ("L2CA_ErtmConnectReq() PSM: 0x%04x BDA: %08x%04x p_ertm_info: 0x%08x allowed:0x%x preferred:%d", psm, (p_bd_addr[0]<<24)+(p_bd_addr[1]<<16)+(p_bd_addr[2]<<8)+p_bd_addr[3], (p_bd_addr[4]<<8)+p_bd_addr[5], p_ertm_info, (p_ertm_info) ? p_ertm_info->allowed_modes : 0, (p_ertm_info) ? p_ertm_info->preferred_mode : 0); /* Fail if we have not established communications with the controller */ if (!BTM_IsDeviceUp()) { L2CAP_TRACE_WARNING ("L2CAP connect req - BTU not ready"); return (0); } /* Fail if the PSM is not registered */ if ((p_rcb = l2cu_find_rcb_by_psm (psm)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no RCB for L2CA_conn_req, PSM: 0x%04x", psm); return (0); } /* First, see if we already have a link to the remote */ /* assume all ERTM l2cap connection is going over BR/EDR for now */ if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) { /* No link. Get an LCB and start link establishment */ if ( ((p_lcb = l2cu_allocate_lcb (p_bd_addr, FALSE, BT_TRANSPORT_BR_EDR)) == NULL) /* currently use BR/EDR for ERTM mode l2cap connection */ || (l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR) == FALSE) ) { L2CAP_TRACE_WARNING ("L2CAP - conn not started for PSM: 0x%04x p_lcb: 0x%08x", psm, p_lcb); return (0); } } /* Allocate a channel control block */ if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_conn_req, PSM: 0x%04x", psm); return (0); } /* Save registration info */ p_ccb->p_rcb = p_rcb; if (p_ertm_info) { p_ccb->ertm_info = *p_ertm_info; /* Replace default indicators with the actual default pool */ if (p_ccb->ertm_info.fcr_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.fcr_rx_pool_id = L2CAP_FCR_RX_POOL_ID; if (p_ccb->ertm_info.fcr_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.fcr_tx_pool_id = L2CAP_FCR_TX_POOL_ID; if (p_ccb->ertm_info.user_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.user_rx_pool_id = HCI_ACL_POOL_ID; if (p_ccb->ertm_info.user_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.user_tx_pool_id = HCI_ACL_POOL_ID; p_ccb->max_rx_mtu = GKI_get_pool_bufsize (p_ertm_info->user_rx_pool_id) - (L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET + L2CAP_FCS_LEN); } /* If link is up, start the L2CAP connection */ if (p_lcb->link_state == LST_CONNECTED) { l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_REQ, NULL); } /* If link is disconnecting, save link info to retry after disconnect * Possible Race condition when a reconnect occurs * on the channel during a disconnect of link. This * ccb will be automatically retried after link disconnect * arrives */ else if (p_lcb->link_state == LST_DISCONNECTING) { L2CAP_TRACE_DEBUG ("L2CAP API - link disconnecting: RETRY LATER"); /* Save ccb so it can be started after disconnect is finished */ p_lcb->p_pending_ccb = p_ccb; } L2CAP_TRACE_API ("L2CAP - L2CA_conn_req(psm: 0x%04x) returned CID: 0x%04x", psm, p_ccb->local_cid); /* Return the local CID as our handle */ return (p_ccb->local_cid); } bool L2CA_SetConnectionCallbacks(uint16_t local_cid, const tL2CAP_APPL_INFO *callbacks) { assert(callbacks != NULL); assert(callbacks->pL2CA_ConnectInd_Cb == NULL); assert(callbacks->pL2CA_ConnectCfm_Cb != NULL); assert(callbacks->pL2CA_ConfigInd_Cb != NULL); assert(callbacks->pL2CA_ConfigCfm_Cb != NULL); assert(callbacks->pL2CA_DisconnectInd_Cb != NULL); assert(callbacks->pL2CA_DisconnectCfm_Cb != NULL); assert(callbacks->pL2CA_CongestionStatus_Cb != NULL); assert(callbacks->pL2CA_DataInd_Cb != NULL); assert(callbacks->pL2CA_TxComplete_Cb != NULL); tL2C_CCB *channel_control_block = l2cu_find_ccb_by_cid(NULL, local_cid); if (!channel_control_block) { LOG_ERROR("%s no channel control block found for L2CAP LCID=0x%04x.", __func__, local_cid); return false; } // We're making a connection-specific registration control block so we check if // we already have a private one allocated to us on the heap. If not, we make a // new allocation, mark it as heap-allocated, and inherit the fields from the old // control block. tL2C_RCB *registration_control_block = channel_control_block->p_rcb; if (!channel_control_block->should_free_rcb) { registration_control_block = (tL2C_RCB *)osi_calloc(sizeof(tL2C_RCB)); if (!registration_control_block) { LOG_ERROR("%s unable to allocate registration control block.", __func__); return false; } *registration_control_block = *channel_control_block->p_rcb; channel_control_block->p_rcb = registration_control_block; channel_control_block->should_free_rcb = true; } registration_control_block->api = *callbacks; return true; } /******************************************************************************* ** ** Function L2CA_ConnectRsp ** ** Description Higher layers call this function to accept an incoming ** L2CAP connection, for which they had gotten an connect ** indication callback. ** ** Returns TRUE for success, FALSE for failure ** *******************************************************************************/ BOOLEAN L2CA_ConnectRsp (BD_ADDR p_bd_addr, UINT8 id, UINT16 lcid, UINT16 result, UINT16 status) { return L2CA_ErtmConnectRsp (p_bd_addr, id, lcid, result, status, NULL); } /******************************************************************************* ** ** Function L2CA_ErtmConnectRsp ** ** Description Higher layers call this function to accept an incoming ** L2CAP connection, for which they had gotten an connect ** indication callback. ** ** Returns TRUE for success, FALSE for failure ** *******************************************************************************/ BOOLEAN L2CA_ErtmConnectRsp (BD_ADDR p_bd_addr, UINT8 id, UINT16 lcid, UINT16 result, UINT16 status, tL2CAP_ERTM_INFO *p_ertm_info) { tL2C_LCB *p_lcb; tL2C_CCB *p_ccb; counter_add("l2cap.conn.rsp", 1); L2CAP_TRACE_API ("L2CA_ErtmConnectRsp() CID: 0x%04x Result: %d Status: %d BDA: %08x%04x p_ertm_info:0x%08x", lcid, result, status, (p_bd_addr[0]<<24)+(p_bd_addr[1]<<16)+(p_bd_addr[2]<<8)+p_bd_addr[3], (p_bd_addr[4]<<8)+p_bd_addr[5], p_ertm_info); /* First, find the link control block */ if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) { /* No link. Get an LCB and start link establishment */ L2CAP_TRACE_WARNING ("L2CAP - no LCB for L2CA_conn_rsp"); return (FALSE); } /* Now, find the channel control block */ if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_conn_rsp"); return (FALSE); } /* The IDs must match */ if (p_ccb->remote_id != id) { L2CAP_TRACE_WARNING ("L2CAP - bad id in L2CA_conn_rsp. Exp: %d Got: %d", p_ccb->remote_id, id); return (FALSE); } if (p_ertm_info) { p_ccb->ertm_info = *p_ertm_info; /* Replace default indicators with the actual default pool */ if (p_ccb->ertm_info.fcr_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.fcr_rx_pool_id = L2CAP_FCR_RX_POOL_ID; if (p_ccb->ertm_info.fcr_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.fcr_tx_pool_id = L2CAP_FCR_TX_POOL_ID; if (p_ccb->ertm_info.user_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.user_rx_pool_id = HCI_ACL_POOL_ID; if (p_ccb->ertm_info.user_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) p_ccb->ertm_info.user_tx_pool_id = HCI_ACL_POOL_ID; p_ccb->max_rx_mtu = GKI_get_pool_bufsize (p_ertm_info->user_rx_pool_id) - (L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET + L2CAP_FCS_LEN); } if (result == L2CAP_CONN_OK) { l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_RSP, NULL); } else { tL2C_CONN_INFO conn_info; conn_info.l2cap_result = result; conn_info.l2cap_status = status; if (result == L2CAP_CONN_PENDING) l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_RSP, &conn_info); else l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_RSP_NEG, &conn_info); } return (TRUE); } /******************************************************************************* ** ** Function L2CA_ConfigReq ** ** Description Higher layers call this function to send configuration. ** ** Note: The FCR options of p_cfg are not used. ** ** Returns TRUE if configuration sent, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_ConfigReq (UINT16 cid, tL2CAP_CFG_INFO *p_cfg) { tL2C_CCB *p_ccb; counter_add("l2cap.cfg.req", 1); L2CAP_TRACE_API ("L2CA_ConfigReq() CID 0x%04x: fcr_present:%d (mode %d) mtu_present:%d (%d)", cid, p_cfg->fcr_present, p_cfg->fcr.mode, p_cfg->mtu_present, p_cfg->mtu); /* 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_cfg_req, CID: %d", cid); return (FALSE); } /* We need to have at least one mode type common with the peer */ if (!l2c_fcr_adj_our_req_options(p_ccb, p_cfg)) return (FALSE); /* Don't adjust FCR options if not used */ if ((!p_cfg->fcr_present)||(p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE)) { /* FCR and FCS options are not used in basic mode */ p_cfg->fcs_present = FALSE; p_cfg->ext_flow_spec_present = FALSE; if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) ) { L2CAP_TRACE_WARNING ("L2CAP - adjust MTU: %u too large", p_cfg->mtu); p_cfg->mtu = L2CAP_MTU_SIZE; } } /* Save the adjusted configuration in case it needs to be used for renegotiation */ p_ccb->our_cfg = *p_cfg; l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONFIG_REQ, p_cfg); return (TRUE); } /******************************************************************************* ** ** Function L2CA_ConfigRsp ** ** Description Higher layers call this function to send a configuration ** response. ** ** Returns TRUE if configuration response sent, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_ConfigRsp (UINT16 cid, tL2CAP_CFG_INFO *p_cfg) { tL2C_CCB *p_ccb; counter_add("l2cap.cfg.rsp", 1); L2CAP_TRACE_API ("L2CA_ConfigRsp() CID: 0x%04x Result: %d MTU present:%d Flush TO:%d FCR:%d FCS:%d", cid, p_cfg->result, p_cfg->mtu_present, p_cfg->flush_to_present, p_cfg->fcr_present, p_cfg->fcs_present); /* 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_cfg_rsp, CID: %d", cid); return (FALSE); } if ( (p_cfg->result == L2CAP_CFG_OK) || (p_cfg->result == L2CAP_CFG_PENDING) ) l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONFIG_RSP, p_cfg); else { p_cfg->fcr_present = FALSE; /* FCR options already negotiated before this point */ /* Clear out any cached options that are being returned as an error (excluding FCR) */ if (p_cfg->mtu_present) p_ccb->peer_cfg.mtu_present = FALSE; if (p_cfg->flush_to_present) p_ccb->peer_cfg.flush_to_present = FALSE; if (p_cfg->qos_present) p_ccb->peer_cfg.qos_present = FALSE; l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONFIG_RSP_NEG, p_cfg); } return (TRUE); } /******************************************************************************* ** ** Function L2CA_DisconnectReq ** ** Description Higher layers call this function to disconnect a channel. ** ** Returns TRUE if disconnect sent, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_DisconnectReq (UINT16 cid) { tL2C_CCB *p_ccb; counter_add("l2cap.disconn.req", 1); L2CAP_TRACE_API ("L2CA_DisconnectReq() CID: 0x%04x", cid); /* 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_disc_req, CID: %d", cid); return (FALSE); } l2c_csm_execute (p_ccb, L2CEVT_L2CA_DISCONNECT_REQ, NULL); return (TRUE); } /******************************************************************************* ** ** Function L2CA_DisconnectRsp ** ** Description Higher layers call this function to acknowledge the ** disconnection of a channel. ** ** Returns void ** *******************************************************************************/ BOOLEAN L2CA_DisconnectRsp (UINT16 cid) { tL2C_CCB *p_ccb; counter_add("l2cap.disconn.rsp", 1); L2CAP_TRACE_API ("L2CA_DisconnectRsp() CID: 0x%04x", cid); /* 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_disc_rsp, CID: %d", cid); return (FALSE); } l2c_csm_execute (p_ccb, L2CEVT_L2CA_DISCONNECT_RSP, NULL); return (TRUE); } /******************************************************************************* ** ** Function L2CA_Ping ** ** Description Higher layers call this function to send an echo request. ** ** Returns TRUE if echo request sent, else FALSE. ** *******************************************************************************/ BOOLEAN L2CA_Ping (BD_ADDR p_bd_addr, tL2CA_ECHO_RSP_CB *p_callback) { tL2C_LCB *p_lcb; L2CAP_TRACE_API ("L2CA_Ping() BDA: %02x-%02x-%02x-%02x-%02x-%02x", p_bd_addr[0], p_bd_addr[1], p_bd_addr[2], p_bd_addr[3], p_bd_addr[4], p_bd_addr[5]); /* Fail if we have not established communications with the controller */ if (!BTM_IsDeviceUp()) return (FALSE); /* First, see if we already have a link to the remote */ if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) { /* No link. Get an LCB and start link establishment */ if ((p_lcb = l2cu_allocate_lcb (p_bd_addr, FALSE, BT_TRANSPORT_BR_EDR)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no LCB for L2CA_ping"); return (FALSE); } if (l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR) == FALSE) { return (FALSE); } p_lcb->p_echo_rsp_cb = p_callback; return (TRUE); } /* We only allow 1 ping outstanding at a time */ if (p_lcb->p_echo_rsp_cb != NULL) { L2CAP_TRACE_WARNING ("L2CAP - rejected second L2CA_ping"); return (FALSE); } /* Have a link control block. If link is disconnecting, tell user to retry later */ if (p_lcb->link_state == LST_DISCONNECTING) { L2CAP_TRACE_WARNING ("L2CAP - L2CA_ping rejected - link disconnecting"); return (FALSE); } /* Save address of callback */ p_lcb->p_echo_rsp_cb = p_callback; if (p_lcb->link_state == LST_CONNECTED) { l2cu_adj_id(p_lcb, L2CAP_ADJ_BRCM_ID); /* Make sure not using Broadcom ID */ l2cu_send_peer_echo_req (p_lcb, NULL, 0); btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_ECHO_RSP_TOUT); } return (TRUE); } /******************************************************************************* ** ** Function L2CA_Echo ** ** Description Higher layers call this function to send an echo request ** with application-specific data. ** ** Returns TRUE if echo request sent, else FALSE. ** *******************************************************************************/ BOOLEAN L2CA_Echo (BD_ADDR p_bd_addr, BT_HDR *p_data, tL2CA_ECHO_DATA_CB *p_callback) { tL2C_LCB *p_lcb; UINT8 *pp; L2CAP_TRACE_API ("L2CA_Echo() BDA: %08X%04X", ((p_bd_addr[0] << 24) + (p_bd_addr[1] << 16) + (p_bd_addr[2] << 8) + (p_bd_addr[3])), ((p_bd_addr[4] << 8) + (p_bd_addr[5]))); /* Fail if we have not established communications with the controller */ if (!BTM_IsDeviceUp()) return (FALSE); if ((memcmp(BT_BD_ANY, p_bd_addr, BD_ADDR_LEN) == 0) && (p_data == NULL)) { /* Only register callback without sending message. */ l2cb.p_echo_data_cb = p_callback; return TRUE; } /* We assume the upper layer will call this function only when the link is established. */ if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) { L2CAP_TRACE_ERROR ("L2CA_Echo ERROR : link not established"); return FALSE; } if (p_lcb->link_state != LST_CONNECTED) { L2CAP_TRACE_ERROR ("L2CA_Echo ERROR : link is not connected"); return FALSE; } /* Save address of callback */ l2cb.p_echo_data_cb = p_callback; /* Set the pointer to the beginning of the data */ pp = (UINT8 *)(p_data + 1) + p_data->offset; l2cu_adj_id(p_lcb, L2CAP_ADJ_BRCM_ID); /* Make sure not using Broadcom ID */ l2cu_send_peer_echo_req (p_lcb, pp, p_data->len); return (TRUE); } bool L2CA_GetIdentifiers(uint16_t lcid, uint16_t *rcid, uint16_t *handle) { tL2C_CCB *control_block = l2cu_find_ccb_by_cid(NULL, lcid); if (!control_block) return false; if (rcid) *rcid = control_block->remote_cid; if (handle) *handle = control_block->p_lcb->handle; return true; } /******************************************************************************* ** ** Function L2CA_SetIdleTimeout ** ** Description Higher layers call this function to set the idle timeout for ** a connection, or for all future connections. The "idle timeout" ** is the amount of time that a connection can remain up with ** no L2CAP channels on it. A timeout of zero means that the ** connection will be torn down immediately when the last channel ** is removed. A timeout of 0xFFFF means no timeout. Values are ** in seconds. ** ** Returns TRUE if command succeeded, FALSE if failed ** ** NOTE This timeout takes effect after at least 1 channel has been ** established and removed. L2CAP maintains its own timer from ** whan a connection is established till the first channel is ** set up. *******************************************************************************/ BOOLEAN L2CA_SetIdleTimeout (UINT16 cid, UINT16 timeout, BOOLEAN is_global) { tL2C_CCB *p_ccb; tL2C_LCB *p_lcb; if (is_global) { l2cb.idle_timeout = timeout; } else { /* 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_SetIdleTimeout, CID: %d", cid); return (FALSE); } p_lcb = p_ccb->p_lcb; if ((p_lcb) && (p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) p_lcb->idle_timeout = timeout; else return (FALSE); } return (TRUE); } /******************************************************************************* ** ** Function L2CA_SetIdleTimeoutByBdAddr ** ** Description Higher layers call this function to set the idle timeout for ** a connection. The "idle timeout" is the amount of time that ** a connection can remain up with no L2CAP channels on it. ** A timeout of zero means that the connection will be torn ** down immediately when the last channel is removed. ** A timeout of 0xFFFF means no timeout. Values are in seconds. ** A bd_addr is the remote BD address. If bd_addr = BT_BD_ANY, ** then the idle timeouts for all active l2cap links will be ** changed. ** ** Returns TRUE if command succeeded, FALSE if failed ** ** NOTE This timeout applies to all logical channels active on the ** ACL link. *******************************************************************************/ BOOLEAN L2CA_SetIdleTimeoutByBdAddr(BD_ADDR bd_addr, UINT16 timeout, tBT_TRANSPORT transport) { tL2C_LCB *p_lcb; if (memcmp (BT_BD_ANY, bd_addr, BD_ADDR_LEN)) { p_lcb = l2cu_find_lcb_by_bd_addr( bd_addr, transport); if ((p_lcb) && (p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) { p_lcb->idle_timeout = timeout; if (!p_lcb->ccb_queue.p_first_ccb) l2cu_no_dynamic_ccbs (p_lcb); } else return FALSE; } else { int xx; tL2C_LCB *p_lcb = &l2cb.lcb_pool[0]; for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p_lcb++) { if ((p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) { p_lcb->idle_timeout = timeout; if (!p_lcb->ccb_queue.p_first_ccb) l2cu_no_dynamic_ccbs (p_lcb); } } } return TRUE; } /******************************************************************************* ** ** Function L2CA_SetTraceLevel ** ** Description This function sets the trace level for L2CAP. If called with ** a value of 0xFF, it simply reads the current trace level. ** ** Returns the new (current) trace level ** *******************************************************************************/ UINT8 L2CA_SetTraceLevel (UINT8 new_level) { if (new_level != 0xFF) l2cb.l2cap_trace_level = new_level; return (l2cb.l2cap_trace_level); } /******************************************************************************* ** ** Function L2CA_SetDesireRole ** ** Description This function sets the desire role for L2CAP. ** If the new role is L2CAP_ROLE_ALLOW_SWITCH, allow switch on ** HciCreateConnection. ** If the new role is L2CAP_ROLE_DISALLOW_SWITCH, do not allow switch on ** HciCreateConnection. ** ** If the new role is a valid role (HCI_ROLE_MASTER or HCI_ROLE_SLAVE), ** the desire role is set to the new value. Otherwise, it is not changed. ** ** Returns the new (current) role ** *******************************************************************************/ UINT8 L2CA_SetDesireRole (UINT8 new_role) { L2CAP_TRACE_API ("L2CA_SetDesireRole() new:x%x, disallow_switch:%d", new_role, l2cb.disallow_switch); if (L2CAP_ROLE_CHECK_SWITCH != (L2CAP_ROLE_CHECK_SWITCH & new_role)) { /* do not process the allow_switch when both bits are set */ if (new_role & L2CAP_ROLE_ALLOW_SWITCH) { l2cb.disallow_switch = FALSE; } if (new_role & L2CAP_ROLE_DISALLOW_SWITCH) { l2cb.disallow_switch = TRUE; } } if (new_role == HCI_ROLE_MASTER || new_role == HCI_ROLE_SLAVE) l2cb.desire_role = new_role; return (l2cb.desire_role); } /******************************************************************************* ** ** Function L2CA_LocalLoopbackReq ** ** Description This function sets up a CID for local loopback ** ** Returns CID of 0 if none. ** *******************************************************************************/ UINT16 L2CA_LocalLoopbackReq (UINT16 psm, UINT16 handle, BD_ADDR p_bd_addr) { tL2C_LCB *p_lcb; tL2C_CCB *p_ccb; tL2C_RCB *p_rcb; L2CAP_TRACE_API ("L2CA_LocalLoopbackReq() PSM: %d Handle: 0x%04x", psm, handle); /* Fail if we have not established communications with the controller */ if (!BTM_IsDeviceUp()) { L2CAP_TRACE_WARNING ("L2CAP loop req - BTU not ready"); return (0); } /* Fail if the PSM is not registered */ if ((p_rcb = l2cu_find_rcb_by_psm (psm)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no RCB for L2CA_conn_req, PSM: %d", psm); return (0); } if ((p_lcb = l2cu_allocate_lcb (p_bd_addr, FALSE, BT_TRANSPORT_BR_EDR)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no LCB for L2CA_conn_req"); return (0); } p_lcb->link_state = LST_CONNECTED; p_lcb->handle = handle; /* Allocate a channel control block */ if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL) { L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_conn_req"); return (0); } /* Save registration info */ p_ccb->p_rcb = p_rcb; p_ccb->chnl_state = CST_OPEN; p_ccb->remote_cid = p_ccb->local_cid; p_ccb->config_done = CFG_DONE_MASK; /* Return the local CID as our handle */ return (p_ccb->local_cid); } /******************************************************************************* ** ** Function L2CA_SetAclPriority ** ** Description Sets the transmission priority for a channel. ** (For initial implementation only two values are valid. ** L2CAP_PRIORITY_NORMAL and L2CAP_PRIORITY_HIGH). ** ** Returns TRUE if a valid channel, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_SetAclPriority (BD_ADDR bd_addr, UINT8 priority) { L2CAP_TRACE_API ("L2CA_SetAclPriority() bdaddr: %02x%02x%02x%02x%04x, priority:%d", bd_addr[0], bd_addr[1], bd_addr[2], bd_addr[3], (bd_addr[4] << 8) + bd_addr[5], priority); return (l2cu_set_acl_priority(bd_addr, priority, FALSE)); } /******************************************************************************* ** ** Function L2CA_FlowControl ** ** Description Higher layers call this function to flow control a channel. ** ** data_enabled - TRUE data flows, FALSE data is stopped ** ** Returns TRUE if valid channel, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_FlowControl (UINT16 cid, BOOLEAN data_enabled) { tL2C_CCB *p_ccb; BOOLEAN on_off = !data_enabled; L2CAP_TRACE_API ("L2CA_FlowControl(%d) CID: 0x%04x", on_off, cid); /* 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_FlowControl, CID: 0x%04x data_enabled: %d", cid, data_enabled); return (FALSE); } if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_ERTM_MODE) { L2CAP_TRACE_EVENT ("L2CA_FlowControl() invalid mode:%d", p_ccb->peer_cfg.fcr.mode); return (FALSE); } if (p_ccb->fcrb.local_busy != on_off) { p_ccb->fcrb.local_busy = on_off; if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack) ) { if (on_off) l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0); else l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT); } } return (TRUE); } /******************************************************************************* ** ** Function L2CA_SendTestSFrame ** ** Description Higher layers call this function to send a test S-frame. ** ** Returns TRUE if valid Channel, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_SendTestSFrame (UINT16 cid, UINT8 sup_type, UINT8 back_track) { tL2C_CCB *p_ccb; L2CAP_TRACE_API ("L2CA_SendTestSFrame() CID: 0x%04x Type: 0x%02x back_track: %u", cid, sup_type, back_track); /* 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_SendTestSFrame, CID: %d", cid); return (FALSE); } if ( (p_ccb->chnl_state != CST_OPEN) || (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_ERTM_MODE) ) return (FALSE); p_ccb->fcrb.next_seq_expected -= back_track; l2c_fcr_send_S_frame (p_ccb, (UINT16)(sup_type & 3), (UINT16)(sup_type & (L2CAP_FCR_P_BIT | L2CAP_FCR_F_BIT))); return (TRUE); } /******************************************************************************* ** ** Function L2CA_SetTxPriority ** ** Description Sets the transmission priority for a channel. ** ** Returns TRUE if a valid channel, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_SetTxPriority (UINT16 cid, tL2CAP_CHNL_PRIORITY priority) { tL2C_CCB *p_ccb; L2CAP_TRACE_API ("L2CA_SetTxPriority() CID: 0x%04x, priority:%d", cid, priority); /* 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_SetTxPriority, CID: %d", cid); 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 L2CA_SetChnlDataRate ** ** Description Sets the tx/rx data rate for a channel. ** ** Returns TRUE if a valid channel, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_SetChnlDataRate (UINT16 cid, tL2CAP_CHNL_DATA_RATE tx, tL2CAP_CHNL_DATA_RATE rx) { tL2C_CCB *p_ccb; L2CAP_TRACE_API ("L2CA_SetChnlDataRate() CID: 0x%04x, tx:%d, rx:%d", cid, tx, rx); /* 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_SetChnlDataRate, CID: %d", cid); return (FALSE); } p_ccb->tx_data_rate = tx; p_ccb->rx_data_rate = rx; /* Adjust channel buffer allocation */ l2c_link_adjust_chnl_allocation (); return(TRUE); } /******************************************************************************* ** ** Function L2CA_SetFlushTimeout ** ** Description This function set the automatic flush time out in Baseband ** for ACL-U packets. ** BdAddr : the remote BD address of ACL link. If it is BT_DB_ANY ** then the flush time out will be applied to all ACL link. ** FlushTimeout: flush time out in ms ** 0x0000 : No automatic flush ** L2CAP_NO_RETRANSMISSION : No retransmission ** 0x0002 - 0xFFFE : flush time out, if (flush_tout*8)+3/5) ** <= HCI_MAX_AUTO_FLUSH_TOUT (in 625us slot). ** Otherwise, return FALSE. ** L2CAP_NO_AUTOMATIC_FLUSH : No automatic flush ** ** Returns TRUE if command succeeded, FALSE if failed ** ** NOTE This flush timeout applies to all logical channels active on the ** ACL link. *******************************************************************************/ BOOLEAN L2CA_SetFlushTimeout (BD_ADDR bd_addr, UINT16 flush_tout) { tL2C_LCB *p_lcb; UINT16 hci_flush_to; UINT32 temp; /* no automatic flush (infinite timeout) */ if (flush_tout == 0x0000) { hci_flush_to = flush_tout; flush_tout = L2CAP_NO_AUTOMATIC_FLUSH; } /* no retransmission */ else if (flush_tout == L2CAP_NO_RETRANSMISSION) { /* not mandatory range for controller */ /* Packet is flushed before getting any ACK/NACK */ /* To do this, flush timeout should be 1 baseband slot */ hci_flush_to = flush_tout; } /* no automatic flush (infinite timeout) */ else if (flush_tout == L2CAP_NO_AUTOMATIC_FLUSH) { hci_flush_to = 0x0000; } else { /* convert L2CAP flush_to to 0.625 ms units, with round */ temp = (((UINT32)flush_tout * 8) + 3) / 5; /* if L2CAP flush_to within range of HCI, set HCI flush timeout */ if (temp > HCI_MAX_AUTO_FLUSH_TOUT) { L2CAP_TRACE_WARNING("WARNING L2CA_SetFlushTimeout timeout(0x%x) is out of range", flush_tout); return FALSE; } else { hci_flush_to = (UINT16)temp; } } if (memcmp (BT_BD_ANY, bd_addr, BD_ADDR_LEN)) { p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR); if ((p_lcb) && (p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) { if (p_lcb->link_flush_tout != flush_tout) { p_lcb->link_flush_tout = flush_tout; L2CAP_TRACE_API ("L2CA_SetFlushTimeout 0x%04x ms for bd_addr [...;%02x%02x%02x]", flush_tout, bd_addr[3], bd_addr[4], bd_addr[5]); if (!btsnd_hcic_write_auto_flush_tout (p_lcb->handle, hci_flush_to)) return (FALSE); } } else { L2CAP_TRACE_WARNING ("WARNING L2CA_SetFlushTimeout No lcb for bd_addr [...;%02x%02x%02x]", bd_addr[3], bd_addr[4], bd_addr[5]); return (FALSE); } } else { int xx; p_lcb = &l2cb.lcb_pool[0]; for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p_lcb++) { if ((p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) { if (p_lcb->link_flush_tout != flush_tout) { p_lcb->link_flush_tout = flush_tout; L2CAP_TRACE_API ("L2CA_SetFlushTimeout 0x%04x ms for bd_addr [...;%02x%02x%02x]", flush_tout, p_lcb->remote_bd_addr[3], p_lcb->remote_bd_addr[4], p_lcb->remote_bd_addr[5]); if (!btsnd_hcic_write_auto_flush_tout(p_lcb->handle, hci_flush_to)) return (FALSE); } } } } return (TRUE); } /******************************************************************************* ** ** Function L2CA_GetPeerFeatures ** ** Description Get a peers features and fixed channel map ** ** Parameters: BD address of the peer ** Pointers to features and channel mask storage area ** ** Return value: TRUE if peer is connected ** *******************************************************************************/ BOOLEAN L2CA_GetPeerFeatures (BD_ADDR bd_addr, UINT32 *p_ext_feat, UINT8 *p_chnl_mask) { tL2C_LCB *p_lcb; /* We must already have a link to the remote */ if ((p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) { L2CAP_TRACE_WARNING ("L2CA_GetPeerFeatures() No BDA: %08x%04x", (bd_addr[0]<<24)+(bd_addr[1]<<16)+(bd_addr[2]<<8)+bd_addr[3], (bd_addr[4]<<8)+bd_addr[5]); return (FALSE); } L2CAP_TRACE_API ("L2CA_GetPeerFeatures() BDA: %08x%04x ExtFea: 0x%08x Chnl_Mask[0]: 0x%02x", (bd_addr[0]<<24)+(bd_addr[1]<<16)+(bd_addr[2]<<8)+bd_addr[3], (bd_addr[4]<<8)+bd_addr[5], p_lcb->peer_ext_fea, p_lcb->peer_chnl_mask[0]); *p_ext_feat = p_lcb->peer_ext_fea; memcpy (p_chnl_mask, p_lcb->peer_chnl_mask, L2CAP_FIXED_CHNL_ARRAY_SIZE); return (TRUE); } /******************************************************************************* ** ** Function L2CA_GetBDAddrbyHandle ** ** Description Get BD address for the given HCI handle ** ** Parameters: HCI handle ** BD address of the peer ** ** Return value: TRUE if found lcb for the given handle, FALSE otherwise ** *******************************************************************************/ BOOLEAN L2CA_GetBDAddrbyHandle (UINT16 handle, BD_ADDR bd_addr) { tL2C_LCB *p_lcb = NULL; BOOLEAN found_dev = FALSE; p_lcb = l2cu_find_lcb_by_handle (handle); if (p_lcb) { found_dev = TRUE; memcpy (bd_addr, p_lcb->remote_bd_addr, BD_ADDR_LEN); } return found_dev; } /******************************************************************************* ** ** Function L2CA_GetChnlFcrMode ** ** Description Get the channel FCR mode ** ** Parameters: Local CID ** ** Return value: Channel mode ** *******************************************************************************/ UINT8 L2CA_GetChnlFcrMode (UINT16 lcid) { tL2C_CCB *p_ccb = l2cu_find_ccb_by_cid (NULL, lcid); if (p_ccb) { L2CAP_TRACE_API ("L2CA_GetChnlFcrMode() returns mode %d", p_ccb->peer_cfg.fcr.mode); return (p_ccb->peer_cfg.fcr.mode); } L2CAP_TRACE_API ("L2CA_GetChnlFcrMode() returns mode L2CAP_FCR_BASIC_MODE"); return (L2CAP_FCR_BASIC_MODE); } #if (L2CAP_NUM_FIXED_CHNLS > 0) /******************************************************************************* ** ** Function L2CA_RegisterFixedChannel ** ** Description Register a fixed channel. ** ** Parameters: Fixed Channel # ** Channel Callbacks and config ** ** Return value: - ** *******************************************************************************/ BOOLEAN L2CA_RegisterFixedChannel (UINT16 fixed_cid, tL2CAP_FIXED_CHNL_REG *p_freg) { if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL) ) { L2CAP_TRACE_ERROR ("L2CA_RegisterFixedChannel() Invalid CID: 0x%04x", fixed_cid); return (FALSE); } l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL] = *p_freg; return (TRUE); } /******************************************************************************* ** ** Function L2CA_ConnectFixedChnl ** ** Description Connect an fixed signalling channel to a remote device. ** ** Parameters: Fixed CID ** BD Address of remote ** ** Return value: TRUE if connection started ** *******************************************************************************/ BOOLEAN L2CA_ConnectFixedChnl (UINT16 fixed_cid, BD_ADDR rem_bda) { tL2C_LCB *p_lcb; tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR; L2CAP_TRACE_API ("%s() CID: 0x%04x BDA: %08x%04x", __func__, fixed_cid, (rem_bda[0]<<24)+(rem_bda[1]<<16)+(rem_bda[2]<<8)+rem_bda[3], (rem_bda[4]<<8)+rem_bda[5]); // Check CID is valid and registered if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL) || (l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb == NULL) ) { L2CAP_TRACE_ERROR ("%s() Invalid CID: 0x%04x", __func__, fixed_cid); return (FALSE); } // Fail if BT is not yet up if (!BTM_IsDeviceUp()) { L2CAP_TRACE_WARNING ("%s(0x%04x) - BTU not ready", __func__, fixed_cid); return (FALSE); } #if BLE_INCLUDED == TRUE if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) transport = BT_TRANSPORT_LE; #endif tL2C_BLE_FIXED_CHNLS_MASK peer_channel_mask; // If we already have a link to the remote, check if it supports that CID if ((p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport)) != NULL) { // Fixed channels are mandatory on LE transports so ignore the received // channel mask and use the locally cached LE channel mask. #if BLE_INCLUDED == TRUE if (transport == BT_TRANSPORT_LE) peer_channel_mask = l2cb.l2c_ble_fixed_chnls_mask; else #endif peer_channel_mask = p_lcb->peer_chnl_mask[0]; // Check for supported channel if (!(peer_channel_mask & (1 << fixed_cid))) { L2CAP_TRACE_EVENT ("%s() CID:0x%04x BDA: %08x%04x not supported", __func__, fixed_cid,(rem_bda[0]<<24)+(rem_bda[1]<<16)+(rem_bda[2]<<8)+rem_bda[3], (rem_bda[4]<<8)+rem_bda[5]); return FALSE; } // Get a CCB and link the lcb to it if (!l2cu_initialize_fixed_ccb (p_lcb, fixed_cid, &l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) { L2CAP_TRACE_WARNING ("%s(0x%04x) - LCB but no CCB", __func__, fixed_cid); return FALSE; } // racing with disconnecting, queue the connection request if (p_lcb->link_state == LST_DISCONNECTING) { L2CAP_TRACE_DEBUG ("$s() - link disconnecting: RETRY LATER", __func__); /* Save ccb so it can be started after disconnect is finished */ p_lcb->p_pending_ccb = p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]; return TRUE; } #if BLE_INCLUDED == TRUE (*l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedConn_Cb) (fixed_cid,p_lcb->remote_bd_addr, TRUE, 0, p_lcb->transport); #else (*l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedConn_Cb) (fixed_cid, p_lcb->remote_bd_addr, TRUE, 0, BT_TRANSPORT_BR_EDR); #endif return TRUE; } // No link. Get an LCB and start link establishment if ((p_lcb = l2cu_allocate_lcb (rem_bda, FALSE, transport)) == NULL) { L2CAP_TRACE_WARNING ("%s(0x%04x) - no LCB", __func__, fixed_cid); return FALSE; } // Get a CCB and link the lcb to it if (!l2cu_initialize_fixed_ccb (p_lcb, fixed_cid, &l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) { p_lcb->disc_reason = L2CAP_CONN_NO_RESOURCES; L2CAP_TRACE_WARNING ("%s(0x%04x) - no CCB", __func__, fixed_cid); l2cu_release_lcb (p_lcb); return FALSE; } if (!l2cu_create_conn(p_lcb, transport)) { L2CAP_TRACE_WARNING ("%s() - create_conn failed", __func__); l2cu_release_lcb (p_lcb); return FALSE; } return TRUE; } /******************************************************************************* ** ** Function L2CA_SendFixedChnlData ** ** Description Write data on a fixed channel. ** ** Parameters: Fixed CID ** BD Address of remote ** Pointer to buffer of type BT_HDR ** ** Return value L2CAP_DW_SUCCESS, if data accepted ** L2CAP_DW_FAILED, if error ** *******************************************************************************/ UINT16 L2CA_SendFixedChnlData (UINT16 fixed_cid, BD_ADDR rem_bda, BT_HDR *p_buf) { tL2C_LCB *p_lcb; tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR; L2CAP_TRACE_API ("L2CA_SendFixedChnlData() CID: 0x%04x BDA: %08x%04x", fixed_cid, (rem_bda[0]<<24)+(rem_bda[1]<<16)+(rem_bda[2]<<8)+rem_bda[3], (rem_bda[4]<<8)+rem_bda[5]); #if BLE_INCLUDED == TRUE if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) transport = BT_TRANSPORT_LE; #endif // Check CID is valid and registered if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL) || (l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb == NULL) ) { L2CAP_TRACE_ERROR ("L2CA_SendFixedChnlData() Invalid CID: 0x%04x", fixed_cid); GKI_freebuf (p_buf); return (L2CAP_DW_FAILED); } // Fail if BT is not yet up if (!BTM_IsDeviceUp()) { L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData(0x%04x) - BTU not ready", fixed_cid); GKI_freebuf (p_buf); return (L2CAP_DW_FAILED); } // We need to have a link up if ((p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport)) == NULL || /* if link is disconnecting, also report data sending failure */ p_lcb->link_state == LST_DISCONNECTING) { L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData(0x%04x) - no LCB", fixed_cid); GKI_freebuf (p_buf); return (L2CAP_DW_FAILED); } tL2C_BLE_FIXED_CHNLS_MASK peer_channel_mask; // Select peer channels mask to use depending on transport #if BLE_INCLUDED == TRUE if (transport == BT_TRANSPORT_LE) peer_channel_mask = l2cb.l2c_ble_fixed_chnls_mask; else #endif peer_channel_mask = p_lcb->peer_chnl_mask[0]; if ((peer_channel_mask & (1 << fixed_cid)) == 0) { L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData() - peer does not support fixed chnl: 0x%04x", fixed_cid); GKI_freebuf (p_buf); return (L2CAP_DW_FAILED); } p_buf->event = 0; p_buf->layer_specific = L2CAP_FLUSHABLE_CH_BASED; if (!p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]) { if (!l2cu_initialize_fixed_ccb (p_lcb, fixed_cid, &l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) { L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData() - no CCB for chnl: 0x%4x", fixed_cid); GKI_freebuf (p_buf); return (L2CAP_DW_FAILED); } } // If already congested, do not accept any more packets if (p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->cong_sent) { L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested \ xmit_hold_q.count: %u buff_quota: %u", fixed_cid, GKI_queue_length(&p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->xmit_hold_q), p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->buff_quota); GKI_freebuf (p_buf); return (L2CAP_DW_FAILED); } l2c_enqueue_peer_data (p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL], p_buf); l2c_link_check_send_pkts (p_lcb, NULL, NULL); // If there is no dynamic CCB on the link, restart the idle timer each time something is sent if (p_lcb->in_use && p_lcb->link_state == LST_CONNECTED && !p_lcb->ccb_queue.p_first_ccb) { l2cu_no_dynamic_ccbs (p_lcb); } if (p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->cong_sent) return (L2CAP_DW_CONGESTED); return (L2CAP_DW_SUCCESS); } /******************************************************************************* ** ** Function L2CA_RemoveFixedChnl ** ** Description Remove a fixed channel to a remote device. ** ** Parameters: Fixed CID ** BD Address of remote ** Idle timeout to use (or 0xFFFF if don't care) ** ** Return value: TRUE if channel removed ** *******************************************************************************/ BOOLEAN L2CA_RemoveFixedChnl (UINT16 fixed_cid, BD_ADDR rem_bda) { tL2C_LCB *p_lcb; tL2C_CCB *p_ccb; tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR; /* Check CID is valid and registered */ if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL) || (l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb == NULL) ) { L2CAP_TRACE_ERROR ("L2CA_RemoveFixedChnl() Invalid CID: 0x%04x", fixed_cid); return (FALSE); } #if BLE_INCLUDED == TRUE if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) transport = BT_TRANSPORT_LE; #endif /* Is a fixed channel connected to the remote BDA ?*/ p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport); if ( ((p_lcb) == NULL) || (!p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]) ) { L2CAP_TRACE_WARNING ("L2CA_RemoveFixedChnl() CID: 0x%04x BDA: %08x%04x not connected", fixed_cid, (rem_bda[0]<<24)+(rem_bda[1]<<16)+(rem_bda[2]<<8)+rem_bda[3], (rem_bda[4]<<8)+rem_bda[5]); return (FALSE); } L2CAP_TRACE_API ("L2CA_RemoveFixedChnl() CID: 0x%04x BDA: %08x%04x", fixed_cid, (rem_bda[0]<<24)+(rem_bda[1]<<16)+(rem_bda[2]<<8)+rem_bda[3], (rem_bda[4]<<8)+rem_bda[5]); /* Release the CCB, starting an inactivity timeout on the LCB if no other CCBs exist */ p_ccb = p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]; p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL] = NULL; p_lcb->disc_reason = HCI_ERR_CONN_CAUSE_LOCAL_HOST; #if BLE_INCLUDED == TRUE // Retain the link for a few more seconds after SMP pairing is done, since the Android // platform always does service discovery after pairing is complete. This will avoid // the link down (pairing is complete) and an immediate re-connection for service // discovery. // Some devices do not do auto advertising when link is dropped, thus fail the second // connection and service discovery. if ((fixed_cid == L2CAP_ATT_CID ) && !p_lcb->ccb_queue.p_first_ccb) p_lcb->idle_timeout = 0; #endif l2cu_release_ccb (p_ccb); return (TRUE); } /******************************************************************************* ** ** Function L2CA_SetFixedChannelTout ** ** Description Higher layers call this function to set the idle timeout for ** a fixed channel. The "idle timeout" is the amount of time that ** a connection can remain up with no L2CAP channels on it. ** A timeout of zero means that the connection will be torn ** down immediately when the last channel is removed. ** A timeout of 0xFFFF means no timeout. Values are in seconds. ** A bd_addr is the remote BD address. If bd_addr = BT_BD_ANY, ** then the idle timeouts for all active l2cap links will be ** changed. ** ** Returns TRUE if command succeeded, FALSE if failed ** *******************************************************************************/ BOOLEAN L2CA_SetFixedChannelTout (BD_ADDR rem_bda, UINT16 fixed_cid, UINT16 idle_tout) { tL2C_LCB *p_lcb; tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR; #if BLE_INCLUDED == TRUE if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) transport = BT_TRANSPORT_LE; #endif /* Is a fixed channel connected to the remote BDA ?*/ p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport); if ( ((p_lcb) == NULL) || (!p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]) ) { L2CAP_TRACE_WARNING ("L2CA_SetFixedChannelTout() CID: 0x%04x BDA: %08x%04x not connected", fixed_cid, (rem_bda[0]<<24)+(rem_bda[1]<<16)+(rem_bda[2]<<8)+rem_bda[3], (rem_bda[4]<<8)+rem_bda[5]); return (FALSE); } p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->fixed_chnl_idle_tout = idle_tout; if (p_lcb->in_use && p_lcb->link_state == LST_CONNECTED && !p_lcb->ccb_queue.p_first_ccb) { /* If there are no dynamic CCBs, (re)start the idle timer in case we changed it */ l2cu_no_dynamic_ccbs (p_lcb); } return TRUE; } #endif /* #if (L2CAP_NUM_FIXED_CHNLS > 0) */ /******************************************************************************* ** ** Function L2CA_GetCurrentConfig ** ** Description This function returns configurations of L2CAP channel ** pp_our_cfg : pointer of our saved configuration options ** p_our_cfg_bits : valid config in bitmap ** pp_peer_cfg: pointer of peer's saved configuration options ** p_peer_cfg_bits : valid config in bitmap ** ** Returns TRUE if successful ** *******************************************************************************/ BOOLEAN L2CA_GetCurrentConfig (UINT16 lcid, tL2CAP_CFG_INFO **pp_our_cfg, tL2CAP_CH_CFG_BITS *p_our_cfg_bits, tL2CAP_CFG_INFO **pp_peer_cfg, tL2CAP_CH_CFG_BITS *p_peer_cfg_bits) { tL2C_CCB *p_ccb; L2CAP_TRACE_API ("L2CA_GetCurrentConfig() CID: 0x%04x", lcid); p_ccb = l2cu_find_ccb_by_cid(NULL, lcid); if (p_ccb) { *pp_our_cfg = &(p_ccb->our_cfg); /* convert valid config items into bitmap */ *p_our_cfg_bits = 0; if (p_ccb->our_cfg.mtu_present) *p_our_cfg_bits |= L2CAP_CH_CFG_MASK_MTU; if (p_ccb->our_cfg.qos_present) *p_our_cfg_bits |= L2CAP_CH_CFG_MASK_QOS; if (p_ccb->our_cfg.flush_to_present) *p_our_cfg_bits |= L2CAP_CH_CFG_MASK_FLUSH_TO; if (p_ccb->our_cfg.fcr_present) *p_our_cfg_bits |= L2CAP_CH_CFG_MASK_FCR; if (p_ccb->our_cfg.fcs_present) *p_our_cfg_bits |= L2CAP_CH_CFG_MASK_FCS; if (p_ccb->our_cfg.ext_flow_spec_present) *p_our_cfg_bits |= L2CAP_CH_CFG_MASK_EXT_FLOW_SPEC; *pp_peer_cfg = &(p_ccb->peer_cfg); *p_peer_cfg_bits = p_ccb->peer_cfg_bits; return TRUE; } else { L2CAP_TRACE_ERROR ("No CCB for CID:0x%04x", lcid); return FALSE; } } /******************************************************************************* ** ** Function L2CA_RegForNoCPEvt ** ** Description Register callback for Number of Completed Packets event. ** ** Input Param p_cb - callback for Number of completed packets event ** p_bda - BT address of remote device ** ** Returns TRUE if registered OK, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_RegForNoCPEvt(tL2CA_NOCP_CB *p_cb, BD_ADDR p_bda) { tL2C_LCB *p_lcb; /* Find the link that is associated with this remote bdaddr */ p_lcb = l2cu_find_lcb_by_bd_addr (p_bda, BT_TRANSPORT_BR_EDR); /* If no link for this handle, nothing to do. */ if (!p_lcb) return FALSE; p_lcb->p_nocp_cb = p_cb; return TRUE; } /******************************************************************************* ** ** Function L2CA_DataWrite ** ** Description Higher layers 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 ** *******************************************************************************/ UINT8 L2CA_DataWrite (UINT16 cid, BT_HDR *p_data) { L2CAP_TRACE_API ("L2CA_DataWrite() CID: 0x%04x Len: %d", cid, p_data->len); return l2c_data_write (cid, p_data, L2CAP_FLUSHABLE_CH_BASED); } /******************************************************************************* ** ** Function L2CA_SetChnlFlushability ** ** Description Higher layers call this function to set a channels ** flushability flags ** ** Returns TRUE if CID found, else FALSE ** *******************************************************************************/ BOOLEAN L2CA_SetChnlFlushability (UINT16 cid, BOOLEAN is_flushable) { #if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE) 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_SetChnlFlushability, CID: %d", cid); return (FALSE); } p_ccb->is_flushable = is_flushable; L2CAP_TRACE_API ("L2CA_SetChnlFlushability() CID: 0x%04x is_flushable: %d", cid, is_flushable); #endif return (TRUE); } /******************************************************************************* ** ** Function L2CA_DataWriteEx ** ** Description Higher layers call this function to write data with extended ** flags. ** flags : L2CAP_FLUSHABLE_CH_BASED ** L2CAP_FLUSHABLE_PKT ** L2CAP_NON_FLUSHABLE_PKT ** ** 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 ** *******************************************************************************/ UINT8 L2CA_DataWriteEx (UINT16 cid, BT_HDR *p_data, UINT16 flags) { L2CAP_TRACE_API ("L2CA_DataWriteEx() CID: 0x%04x Len: %d Flags:0x%04X", cid, p_data->len, flags); return l2c_data_write (cid, p_data, flags); } /******************************************************************************* ** ** Function L2CA_FlushChannel ** ** Description This function flushes none, some or all buffers queued up ** for xmission for a particular CID. If called with ** L2CAP_FLUSH_CHANS_GET (0), it simply returns the number ** of buffers queued for that CID L2CAP_FLUSH_CHANS_ALL (0xffff) ** flushes all buffers. All other values specifies the maximum ** buffers to flush. ** ** Returns Number of buffers left queued for that CID ** *******************************************************************************/ UINT16 L2CA_FlushChannel (UINT16 lcid, UINT16 num_to_flush) { tL2C_CCB *p_ccb; tL2C_LCB *p_lcb; UINT16 num_left = 0, num_flushed1 = 0, num_flushed2 = 0; p_ccb = l2cu_find_ccb_by_cid(NULL, lcid); if ( !p_ccb || ((p_lcb = p_ccb->p_lcb) == NULL) ) { L2CAP_TRACE_WARNING ("L2CA_FlushChannel() abnormally returning 0 CID: 0x%04x", lcid); return (0); } if (num_to_flush != L2CAP_FLUSH_CHANS_GET) { L2CAP_TRACE_API ("L2CA_FlushChannel (FLUSH) CID: 0x%04x NumToFlush: %d QC: %u pFirst: 0x%08x", lcid, num_to_flush, GKI_queue_length(&p_ccb->xmit_hold_q), GKI_getfirst(&p_ccb->xmit_hold_q)); } else { L2CAP_TRACE_API ("L2CA_FlushChannel (QUERY) CID: 0x%04x", lcid); } /* Cannot flush eRTM buffers once they have a sequence number */ if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_ERTM_MODE) { #if L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE if (num_to_flush != L2CAP_FLUSH_CHANS_GET) { /* If the controller supports enhanced flush, flush the data queued at the controller */ if ( (HCI_NON_FLUSHABLE_PB_SUPPORTED(BTM_ReadLocalFeatures ())) && (BTM_GetNumScoLinks() == 0) ) { if ( l2cb.is_flush_active == FALSE ) { l2cb.is_flush_active = TRUE; /* The only packet type defined - 0 - Automatically-Flushable Only */ btsnd_hcic_enhanced_flush (p_lcb->handle, 0); } } } #endif // Iterate though list and flush the amount requested from // the transmit data queue that satisfy the layer and event conditions. for (const list_node_t *node = list_begin(p_lcb->link_xmit_data_q); (num_to_flush > 0) && node != list_end(p_lcb->link_xmit_data_q);) { BT_HDR *p_buf = (BT_HDR *)list_node(node); node = list_next(node); if ((p_buf->layer_specific == 0) && (p_buf->event == lcid)) { num_to_flush--; num_flushed1++; list_remove(p_lcb->link_xmit_data_q, p_buf); GKI_freebuf(p_buf); } } } /* If needed, flush buffers in the CCB xmit hold queue */ while ( (num_to_flush != 0) && (!GKI_queue_is_empty(&p_ccb->xmit_hold_q))) { BT_HDR *p_buf = (BT_HDR *)GKI_dequeue (&p_ccb->xmit_hold_q); if (p_buf) GKI_freebuf (p_buf); num_to_flush--; num_flushed2++; } /* If app needs to track all packets, call him */ if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (num_flushed2) ) (*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, num_flushed2); /* Now count how many are left */ for (const list_node_t *node = list_begin(p_lcb->link_xmit_data_q); node != list_end(p_lcb->link_xmit_data_q); node = list_next(node)) { BT_HDR *p_buf = (BT_HDR *)list_node(node); if (p_buf->event == lcid) num_left++; } /* Add in the number in the CCB xmit queue */ num_left += GKI_queue_length(&p_ccb->xmit_hold_q); /* Return the local number of buffers left for the CID */ L2CAP_TRACE_DEBUG ("L2CA_FlushChannel() flushed: %u + %u, num_left: %u", num_flushed1, num_flushed2, num_left); /* If we were congested, and now we are not, tell the app */ l2cu_check_channel_congestion (p_ccb); return (num_left); }