diff options
Diffstat (limited to 'stack/rfcomm/rfc_mx_fsm.c')
| -rw-r--r-- | stack/rfcomm/rfc_mx_fsm.c | 663 |
1 files changed, 663 insertions, 0 deletions
diff --git a/stack/rfcomm/rfc_mx_fsm.c b/stack/rfcomm/rfc_mx_fsm.c new file mode 100644 index 0000000..842f8ee --- /dev/null +++ b/stack/rfcomm/rfc_mx_fsm.c @@ -0,0 +1,663 @@ +/****************************************************************************** + * + * 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 state machine and action routines for multiplexer + * channel of the RFCOMM unit + * + ******************************************************************************/ +#include <string.h> +#include "gki.h" +#include "bt_types.h" +#include "rfcdefs.h" +#include "l2cdefs.h" +#include "port_api.h" +#include "port_int.h" +#include "l2c_api.h" +#include "rfc_int.h" + +#define L2CAP_SUCCESS 0 +#define L2CAP_ERROR 1 + + +/********************************************************************************/ +/* 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 rfc_mx_sm_state_idle (tRFC_MCB *p_mcb, UINT16 event, void *p_data); +static void rfc_mx_sm_state_wait_conn_cnf (tRFC_MCB *p_mcb, UINT16 event, void *p_data); +static void rfc_mx_sm_state_configure (tRFC_MCB *p_mcb, UINT16 event, void *p_data); +static void rfc_mx_sm_sabme_wait_ua (tRFC_MCB *p_mcb, UINT16 event, void *p_data); +static void rfc_mx_sm_state_wait_sabme (tRFC_MCB *p_mcb, UINT16 event, void *p_data); +static void rfc_mx_sm_state_connected (tRFC_MCB *p_mcb, UINT16 event, void *p_data); +static void rfc_mx_sm_state_disc_wait_ua (tRFC_MCB *p_mcb, UINT16 event, void *p_data); + +static void rfc_mx_send_config_req (tRFC_MCB *p_mcb); +static void rfc_mx_conf_ind (tRFC_MCB *p_mcb, tL2CAP_CFG_INFO *p_cfg); +static void rfc_mx_conf_cnf (tRFC_MCB *p_mcb, tL2CAP_CFG_INFO *p_cfg); + + + +/******************************************************************************* +** +** Function rfc_mx_sm_execute +** +** Description This function sends multiplexor events through the state +** machine. +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_execute (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + switch (p_mcb->state) + { + case RFC_MX_STATE_IDLE: + rfc_mx_sm_state_idle (p_mcb, event, p_data); + break; + + case RFC_MX_STATE_WAIT_CONN_CNF: + rfc_mx_sm_state_wait_conn_cnf (p_mcb, event, p_data); + break; + + case RFC_MX_STATE_CONFIGURE: + rfc_mx_sm_state_configure (p_mcb, event, p_data); + break; + + case RFC_MX_STATE_SABME_WAIT_UA: + rfc_mx_sm_sabme_wait_ua (p_mcb, event, p_data); + break; + + case RFC_MX_STATE_WAIT_SABME: + rfc_mx_sm_state_wait_sabme (p_mcb, event, p_data); + break; + + case RFC_MX_STATE_CONNECTED: + rfc_mx_sm_state_connected (p_mcb, event, p_data); + break; + + case RFC_MX_STATE_DISC_WAIT_UA: + rfc_mx_sm_state_disc_wait_ua (p_mcb, event, p_data); + break; + + } +} + + +/******************************************************************************* +** +** Function rfc_mx_sm_state_idle +** +** Description This function handles events when the multiplexer is in +** IDLE state. This state exists when connection is being +** initially established. +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_state_idle (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_state_idle - evt:%d", event); + switch (event) + { + case RFC_MX_EVENT_START_REQ: + + /* Initialize L2CAP MTU */ + p_mcb->peer_l2cap_mtu = L2CAP_DEFAULT_MTU - RFCOMM_MIN_OFFSET - 1; + + if ((p_mcb->lcid = L2CA_ConnectReq (BT_PSM_RFCOMM, p_mcb->bd_addr)) == 0) + { + PORT_StartCnf (p_mcb, RFCOMM_ERROR); + return; + } + /* Save entry for quicker access to mcb based on the LCID */ + rfc_save_lcid_mcb (p_mcb, p_mcb->lcid); + + p_mcb->state = RFC_MX_STATE_WAIT_CONN_CNF; + return; + + case RFC_MX_EVENT_START_RSP: + case RFC_MX_EVENT_CONN_CNF: + case RFC_MX_EVENT_CONF_IND: + case RFC_MX_EVENT_CONF_CNF: + RFCOMM_TRACE_ERROR2 ("Mx error state %d event %d", p_mcb->state, event); + return; + + case RFC_MX_EVENT_CONN_IND: + + rfc_timer_start (p_mcb, RFCOMM_CONN_TIMEOUT); + L2CA_ConnectRsp (p_mcb->bd_addr, *((UINT8 *)p_data), p_mcb->lcid, L2CAP_CONN_OK, 0); + + rfc_mx_send_config_req (p_mcb); + + p_mcb->state = RFC_MX_STATE_CONFIGURE; + return; + + case RFC_EVENT_SABME: + break; + + case RFC_EVENT_UA: + case RFC_EVENT_DM: + return; + + case RFC_EVENT_DISC: + rfc_send_dm (p_mcb, RFCOMM_MX_DLCI, TRUE); + return; + + case RFC_EVENT_UIH: + rfc_send_dm (p_mcb, RFCOMM_MX_DLCI, FALSE); + return; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + + +/******************************************************************************* +** +** Function rfc_mx_sm_state_wait_conn_cnf +** +** Description This function handles events when the multiplexer is +** waiting for Connection Confirm from L2CAP. +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_state_wait_conn_cnf (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_state_wait_conn_cnf - evt:%d", event); + switch (event) + { + case RFC_MX_EVENT_START_REQ: + RFCOMM_TRACE_ERROR2 ("Mx error state %d event %d", p_mcb->state, event); + return; + + /* There is some new timing so that Config Ind comes before security is completed + so we are still waiting fo the confirmation. */ + case RFC_MX_EVENT_CONF_IND: + rfc_mx_conf_ind (p_mcb, (tL2CAP_CFG_INFO *)p_data); + return; + + case RFC_MX_EVENT_CONN_CNF: + if (*((UINT16 *)p_data) != L2CAP_SUCCESS) + { + p_mcb->state = RFC_MX_STATE_IDLE; + + PORT_StartCnf (p_mcb, *((UINT16 *)p_data)); + return; + } + p_mcb->state = RFC_MX_STATE_CONFIGURE; + rfc_mx_send_config_req (p_mcb); + return; + + case RFC_MX_EVENT_DISC_IND: + p_mcb->state = RFC_MX_STATE_IDLE; + PORT_CloseInd (p_mcb); + return; + + case RFC_EVENT_TIMEOUT: + p_mcb->state = RFC_MX_STATE_IDLE; + L2CA_DisconnectReq (p_mcb->lcid); + + /* we gave up outgoing connection request then try peer's request */ + if (p_mcb->pending_lcid) + { + UINT16 i; + UINT8 idx; + + RFCOMM_TRACE_DEBUG2 ("RFCOMM MX retry as acceptor in collision case - evt:%d in state:%d", event, p_mcb->state); + + rfc_save_lcid_mcb (NULL, p_mcb->lcid); + p_mcb->lcid = p_mcb->pending_lcid; + rfc_save_lcid_mcb (p_mcb, p_mcb->lcid); + + p_mcb->is_initiator = FALSE; + + /* update direction bit */ + for (i = 0; i < RFCOMM_MAX_DLCI; i += 2) + { + if ((idx = p_mcb->port_inx[i]) != 0) + { + p_mcb->port_inx[i] = 0; + p_mcb->port_inx[i+1] = idx; + rfc_cb.port.port[idx - 1].dlci += 1; + RFCOMM_TRACE_DEBUG2 ("RFCOMM MX - DLCI:%d -> %d", i, rfc_cb.port.port[idx - 1].dlci); + } + } + + rfc_mx_sm_execute (p_mcb, RFC_MX_EVENT_CONN_IND, &(p_mcb->pending_id)); + } + else + { + PORT_CloseInd (p_mcb); + } + return; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + + +/******************************************************************************* +** +** Function rfc_mx_sm_state_configure +** +** Description This function handles events when the multiplexer in the +** configuration state. +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_state_configure (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_state_configure - evt:%d", event); + switch (event) + { + case RFC_MX_EVENT_START_REQ: + case RFC_MX_EVENT_CONN_CNF: + + RFCOMM_TRACE_ERROR2 ("Mx error state %d event %d", p_mcb->state, event); + return; + + case RFC_MX_EVENT_CONF_IND: + rfc_mx_conf_ind (p_mcb, (tL2CAP_CFG_INFO *)p_data); + return; + + case RFC_MX_EVENT_CONF_CNF: + rfc_mx_conf_cnf (p_mcb, (tL2CAP_CFG_INFO *)p_data); + return; + + case RFC_MX_EVENT_DISC_IND: + p_mcb->state = RFC_MX_STATE_IDLE; + PORT_CloseInd (p_mcb); + return; + + case RFC_EVENT_TIMEOUT: + p_mcb->state = RFC_MX_STATE_IDLE; + L2CA_DisconnectReq (p_mcb->lcid); + + PORT_StartCnf (p_mcb, RFCOMM_ERROR); + return; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + + +/******************************************************************************* +** +** Function rfc_mx_sm_sabme_wait_ua +** +** Description This function handles events when the multiplexer sent +** SABME and is waiting for UA reply. +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_sabme_wait_ua (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_sabme_wait_ua - evt:%d", event); + switch (event) + { + case RFC_MX_EVENT_START_REQ: + case RFC_MX_EVENT_CONN_CNF: + RFCOMM_TRACE_ERROR2 ("Mx error state %d event %d", p_mcb->state, event); + return; + + /* workaround: we don't support reconfig */ + /* commented out until we support reconfig + case RFC_MX_EVENT_CONF_IND: + rfc_mx_conf_ind (p_mcb, (tL2CAP_CFG_INFO *)p_data); + return; + + case RFC_MX_EVENT_CONF_CNF: + rfc_mx_conf_cnf (p_mcb, (tL2CAP_CFG_INFO *)p_data); + return; + */ + + case RFC_MX_EVENT_DISC_IND: + p_mcb->state = RFC_MX_STATE_IDLE; + PORT_CloseInd (p_mcb); + return; + + case RFC_EVENT_UA: + rfc_timer_stop (p_mcb); + + p_mcb->state = RFC_MX_STATE_CONNECTED; + p_mcb->peer_ready = TRUE; + + PORT_StartCnf (p_mcb, RFCOMM_SUCCESS); + return; + + case RFC_EVENT_DM: + rfc_timer_stop (p_mcb); + /* Case falls through */ + + case RFC_MX_EVENT_CONF_IND: /* workaround: we don't support reconfig */ + case RFC_MX_EVENT_CONF_CNF: /* workaround: we don't support reconfig */ + case RFC_EVENT_TIMEOUT: + p_mcb->state = RFC_MX_STATE_IDLE; + L2CA_DisconnectReq (p_mcb->lcid); + + PORT_StartCnf (p_mcb, RFCOMM_ERROR); + return; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + +/******************************************************************************* +** +** Function rfc_mx_sm_state_wait_sabme +** +** Description This function handles events when the multiplexer is +** waiting for SABME on the acceptor side after configuration +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_state_wait_sabme (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_state_wait_sabme - evt:%d", event); + switch (event) + { + case RFC_MX_EVENT_DISC_IND: + p_mcb->state = RFC_MX_STATE_IDLE; + PORT_CloseInd (p_mcb); + return; + + case RFC_EVENT_SABME: + /* if we gave up outgoing connection request */ + if (p_mcb->pending_lcid) + { + p_mcb->pending_lcid = 0; + + rfc_send_ua (p_mcb, RFCOMM_MX_DLCI); + + rfc_timer_stop (p_mcb); + p_mcb->state = RFC_MX_STATE_CONNECTED; + p_mcb->peer_ready = TRUE; + + /* MX channel collision has been resolved, continue to open ports */ + PORT_StartCnf (p_mcb, RFCOMM_SUCCESS); + } + else + { + rfc_timer_stop (p_mcb); + PORT_StartInd (p_mcb); + } + return; + + case RFC_MX_EVENT_START_RSP: + if (*((UINT16 *)p_data) != RFCOMM_SUCCESS) + rfc_send_dm (p_mcb, RFCOMM_MX_DLCI, TRUE); + else + { + rfc_send_ua (p_mcb, RFCOMM_MX_DLCI); + + p_mcb->state = RFC_MX_STATE_CONNECTED; + p_mcb->peer_ready = TRUE; + } + return; + + case RFC_MX_EVENT_CONF_IND: /* workaround: we don't support reconfig */ + case RFC_MX_EVENT_CONF_CNF: /* workaround: we don't support reconfig */ + case RFC_EVENT_TIMEOUT: + p_mcb->state = RFC_MX_STATE_IDLE; + L2CA_DisconnectReq (p_mcb->lcid); + + PORT_CloseInd (p_mcb); + return; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + + +/******************************************************************************* +** +** Function rfc_mx_sm_state_connected +** +** Description This function handles events when the multiplexer is +** in the CONNECTED state +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_state_connected (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_state_connected - evt:%d", event); + + switch (event) + { + case RFC_EVENT_TIMEOUT: + case RFC_MX_EVENT_CLOSE_REQ: + rfc_timer_start (p_mcb, RFC_DISC_TIMEOUT); + p_mcb->state = RFC_MX_STATE_DISC_WAIT_UA; + rfc_send_disc (p_mcb, RFCOMM_MX_DLCI); + return; + + case RFC_MX_EVENT_DISC_IND: + p_mcb->state = RFC_MX_STATE_IDLE; + PORT_CloseInd (p_mcb); + return; + + case RFC_EVENT_DISC: + /* Reply with UA. If initiator bring down L2CAP connection */ + /* If server wait for some time if client decide to reinitiate channel */ + rfc_send_ua (p_mcb, RFCOMM_MX_DLCI); + if (p_mcb->is_initiator) + { + L2CA_DisconnectReq (p_mcb->lcid); + } + /* notify all ports that connection is gone */ + PORT_CloseInd (p_mcb); + return; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + + +/******************************************************************************* +** +** Function rfc_mx_sm_state_disc_wait_ua +** +** Description This function handles events when the multiplexer sent +** DISC and is waiting for UA reply. +** +** Returns void +** +*******************************************************************************/ +void rfc_mx_sm_state_disc_wait_ua (tRFC_MCB *p_mcb, UINT16 event, void *p_data) +{ + BT_HDR *p_buf; + + RFCOMM_TRACE_EVENT1 ("rfc_mx_sm_state_disc_wait_ua - evt:%d", event); + switch (event) + { + case RFC_EVENT_UA: + case RFC_EVENT_DM: + case RFC_EVENT_TIMEOUT: + L2CA_DisconnectReq (p_mcb->lcid); + + if (p_mcb->restart_required) + { + /* Start Request was received while disconnecting. Execute it again */ + if ((p_mcb->lcid = L2CA_ConnectReq (BT_PSM_RFCOMM, p_mcb->bd_addr)) == 0) + { + PORT_StartCnf (p_mcb, RFCOMM_ERROR); + return; + } + /* Save entry for quicker access to mcb based on the LCID */ + rfc_save_lcid_mcb (p_mcb, p_mcb->lcid); + + /* clean up before reuse it */ + while ((p_buf = (BT_HDR *)GKI_dequeue(&p_mcb->cmd_q)) != NULL) + GKI_freebuf(p_buf); + + rfc_timer_start (p_mcb, RFC_MCB_INIT_INACT_TIMER); + + p_mcb->is_initiator = TRUE; + p_mcb->restart_required = FALSE; + p_mcb->local_cfg_sent = FALSE; + p_mcb->peer_cfg_rcvd = FALSE; + + p_mcb->state = RFC_MX_STATE_WAIT_CONN_CNF; + return; + } + rfc_release_multiplexer_channel (p_mcb); + return; + + case RFC_EVENT_DISC: + rfc_send_ua (p_mcb, RFCOMM_MX_DLCI); + return; + + case RFC_EVENT_UIH: + GKI_freebuf (p_data); + rfc_send_dm (p_mcb, RFCOMM_MX_DLCI, FALSE); + return; + + case RFC_MX_EVENT_START_REQ: + p_mcb->restart_required = TRUE; + return; + + case RFC_MX_EVENT_DISC_IND: + p_mcb->state = RFC_MX_STATE_IDLE; + PORT_CloseInd (p_mcb); + return; + + case RFC_MX_EVENT_CLOSE_REQ: + return; + + case RFC_MX_EVENT_QOS_VIOLATION_IND: + break; + } + RFCOMM_TRACE_EVENT2 ("RFCOMM MX ignored - evt:%d in state:%d", event, p_mcb->state); +} + + +/******************************************************************************* +** +** Function rfc_mx_send_config_req +** +** Description This function handles L2CA_ConnectInd message from the +** L2CAP. Accept connection. +** +*******************************************************************************/ +static void rfc_mx_send_config_req (tRFC_MCB *p_mcb) +{ + tL2CAP_CFG_INFO cfg; + + RFCOMM_TRACE_EVENT0 ("rfc_mx_send_config_req"); + + memset (&cfg, 0, sizeof (tL2CAP_CFG_INFO)); + + cfg.mtu_present = TRUE; + cfg.mtu = L2CAP_MTU_SIZE; + +/* Defaults set by memset + cfg.flush_to_present = FALSE; + cfg.qos_present = FALSE; + cfg.fcr_present = FALSE; + cfg.fcr.mode = L2CAP_FCR_BASIC_MODE; + cfg.fcs_present = FALSE; + cfg.fcs = N/A when fcs_present is FALSE; +*/ + L2CA_ConfigReq (p_mcb->lcid, &cfg); +} + + +/******************************************************************************* +** +** Function rfc_mx_conf_cnf +** +** Description This function handles L2CA_ConfigCnf message from the +** L2CAP. If result is not success tell upper layer that +** start has not been accepted. If initiator send SABME +** on DLCI 0. T1 is still running. +** +*******************************************************************************/ +static void rfc_mx_conf_cnf (tRFC_MCB *p_mcb, tL2CAP_CFG_INFO *p_cfg) +{ + RFCOMM_TRACE_EVENT2 ("rfc_mx_conf_cnf p_cfg:%08x res:%d ", p_cfg, (p_cfg) ? p_cfg->result : 0); + + if (p_cfg->result != L2CAP_CFG_OK) + { + if (p_mcb->is_initiator) + { + PORT_StartCnf (p_mcb, p_cfg->result); + L2CA_DisconnectReq (p_mcb->lcid); + } + rfc_release_multiplexer_channel (p_mcb); + return; + } + + p_mcb->local_cfg_sent = TRUE; + if ((p_mcb->state == RFC_MX_STATE_CONFIGURE) && p_mcb->peer_cfg_rcvd) + { + if (p_mcb->is_initiator) + { + p_mcb->state = RFC_MX_STATE_SABME_WAIT_UA; + rfc_send_sabme (p_mcb, RFCOMM_MX_DLCI); + rfc_timer_start (p_mcb, RFC_T1_TIMEOUT); + } + else + { + p_mcb->state = RFC_MX_STATE_WAIT_SABME; + rfc_timer_start (p_mcb, RFC_T2_TIMEOUT); + } + } +} + + +/******************************************************************************* +** +** Function rfc_mx_conf_ind +** +** Description This function handles L2CA_ConfigInd message from the +** L2CAP. Send the L2CA_ConfigRsp message. +** +*******************************************************************************/ +static void rfc_mx_conf_ind (tRFC_MCB *p_mcb, tL2CAP_CFG_INFO *p_cfg) +{ + /* Save peer L2CAP MTU if present */ + /* RFCOMM adds 3-4 bytes in the beginning and 1 bytes FCS */ + if (p_cfg->mtu_present) + p_mcb->peer_l2cap_mtu = p_cfg->mtu - RFCOMM_MIN_OFFSET - 1; + else + p_mcb->peer_l2cap_mtu = L2CAP_DEFAULT_MTU - RFCOMM_MIN_OFFSET - 1; + + p_cfg->mtu_present = FALSE; + p_cfg->flush_to_present = FALSE; + p_cfg->qos_present = FALSE; + + p_cfg->result = L2CAP_CFG_OK; + + L2CA_ConfigRsp (p_mcb->lcid, p_cfg); + + p_mcb->peer_cfg_rcvd = TRUE; + if ((p_mcb->state == RFC_MX_STATE_CONFIGURE) && p_mcb->local_cfg_sent) + { + if (p_mcb->is_initiator) + { + p_mcb->state = RFC_MX_STATE_SABME_WAIT_UA; + rfc_send_sabme (p_mcb, RFCOMM_MX_DLCI); + rfc_timer_start (p_mcb, RFC_T1_TIMEOUT); + } + else + { + p_mcb->state = RFC_MX_STATE_WAIT_SABME; + rfc_timer_start (p_mcb, RFC_T2_TIMEOUT); + } + } +} |