/****************************************************************************** * * 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 * ******************************************************************************/ #define LOG_TAG "bt_l2c_main" #include #include #include #include "bt_target.h" #include "btm_int.h" #include "btu.h" #include "device/include/controller.h" #include "bt_common.h" #include "hcimsgs.h" #include "l2c_api.h" #include "l2c_int.h" #include "l2cdefs.h" #include "osi/include/log.h" extern fixed_queue_t *btu_general_alarm_queue; /********************************************************************************/ /* L O C A L F U N C T I O N P R O T O T Y P E S */ /********************************************************************************/ static void process_l2cap_cmd (tL2C_LCB *p_lcb, UINT8 *p, UINT16 pkt_len); /********************************************************************************/ /* G L O B A L L 2 C A P D A T A */ /********************************************************************************/ #if L2C_DYNAMIC_MEMORY == FALSE tL2C_CB l2cb; #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, psm; 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) { alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS, l2c_receive_hold_timer_timeout, NULL, btu_general_alarm_queue); } 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 /* 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) { process_l2cap_cmd (p_lcb, p, l2cap_len); osi_free(p_msg); } else if (rcv_cid == L2CAP_CONNECTIONLESS_CID) { /* process_connectionless_data (p_lcb); */ STREAM_TO_UINT16 (psm, p); 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) { 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) ) { /* 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) l2c_fcr_proc_pdu (p_ccb, p_msg); 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 { if (p_ccb == NULL) osi_free(p_msg); else { if (p_lcb->transport == BT_TRANSPORT_LE) { l2c_lcc_proc_pdu(p_ccb,p_msg); // Got a pkt, valid send out credits to the peer device credit = L2CAP_LE_DEFAULT_CREDIT; l2c_csm_execute(p_ccb, L2CEVT_L2CA_SEND_FLOW_CONTROL_CREDIT, &credit); } else { /* Basic mode packets go straight to the state machine */ if (p_ccb->peer_cfg.fcr.mode == L2CAP_FCR_BASIC_MODE) l2c_csm_execute (p_ccb, L2CEVT_L2CAP_DATA, p_msg); 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)) l2c_fcr_proc_pdu (p_ccb, p_msg); 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 ** *******************************************************************************/ 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) { alarm_cancel(p_lcb->info_resp_timer); 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) { alarm_cancel(p_lcb->info_resp_timer); 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; } } } /******************************************************************************* ** ** 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) { alarm_cancel(l2cb.receive_hold_timer); 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)) { alarm_set_on_queue(l2cb.receive_hold_timer, BT_1SEC_TIMEOUT_MS, l2c_receive_hold_timer_timeout, NULL, btu_general_alarm_queue); } } /******************************************************************************* ** ** Function l2c_init ** ** Description This function is called once at startup to initialize ** all the L2CAP structures ** ** Returns void ** *******************************************************************************/ void l2c_init (void) { INT16 xx; memset (&l2cb, 0, sizeof (tL2C_CB)); /* the psm is increased by 2 before being used */ l2cb.dyn_psm = 0xFFF; /* Put all the channel control blocks on the free queue */ for (xx = 0; xx < MAX_L2CAP_CHANNELS - 1; xx++) { l2cb.ccb_pool[xx].p_next_ccb = &l2cb.ccb_pool[xx + 1]; } #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 l2cb.p_free_ccb_first = &l2cb.ccb_pool[0]; l2cb.p_free_ccb_last = &l2cb.ccb_pool[MAX_L2CAP_CHANNELS - 1]; #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) LOG_ERROR(LOG_TAG, "%s unable to allocate memory for link layer control block", __func__); l2cb.receive_hold_timer = alarm_new("l2c.receive_hold_timer"); } void l2c_free(void) { list_free(l2cb.rcv_pending_q); l2cb.rcv_pending_q = NULL; } void l2c_receive_hold_timer_timeout(UNUSED_ATTR void *data) { /* Update the timeouts in the hold queue */ l2c_process_held_packets(TRUE); } void l2c_ccb_timer_timeout(void *data) { tL2C_CCB *p_ccb = (tL2C_CCB *)data; l2c_csm_execute(p_ccb, L2CEVT_TIMEOUT, NULL); } void l2c_fcrb_ack_timer_timeout(void *data) { tL2C_CCB *p_ccb = (tL2C_CCB *)data; l2c_csm_execute(p_ccb, L2CEVT_ACK_TIMEOUT, NULL); } void l2c_lcb_timer_timeout(void *data) { tL2C_LCB *p_lcb = (tL2C_LCB *)data; l2c_link_timeout(p_lcb); } /******************************************************************************* ** ** 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 ** *******************************************************************************/ 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 */ UINT16 mtu; if (p_ccb->p_lcb->transport == BT_TRANSPORT_LE) mtu = p_ccb->peer_conn_cfg.mtu; else mtu = p_ccb->peer_cfg.mtu; if (p_data->len > 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_ERROR ("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); } l2c_csm_execute (p_ccb, L2CEVT_L2CA_DATA_WRITE, p_data); if (p_ccb->cong_sent) return (L2CAP_DW_CONGESTED); return (L2CAP_DW_SUCCESS); }