-static int llc_station_ac_report_status(struct sk_buff *skb)
-{
- return 0;
-}
-
-/* COMMON STATION STATE transitions */
-
-/* dummy last-transition indicator; common to all state transition groups
- * last entry for this state
- * all members are zeros, .bss zeroes it
- */
-static struct llc_station_state_trans llc_stat_state_trans_end;
-
-/* DOWN STATE transitions */
-
-/* state transition for LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK event */
-static llc_station_action_t llc_stat_down_state_actions_1[] = {
- [0] = llc_station_ac_start_ack_timer,
- [1] = llc_station_ac_set_retry_cnt_0,
- [2] = llc_station_ac_set_xid_r_cnt_0,
- [3] = llc_station_ac_send_null_dsap_xid_c,
- [4] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_down_state_trans_1 = {
- .ev = llc_stat_ev_enable_with_dup_addr_check,
- .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
- .ev_actions = llc_stat_down_state_actions_1,
-};
-
-/* state transition for LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK event */
-static llc_station_action_t llc_stat_down_state_actions_2[] = {
- [0] = llc_station_ac_report_status, /* STATION UP */
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_down_state_trans_2 = {
- .ev = llc_stat_ev_enable_without_dup_addr_check,
- .next_state = LLC_STATION_STATE_UP,
- .ev_actions = llc_stat_down_state_actions_2,
-};
-
-/* array of pointers; one to each transition */
-static struct llc_station_state_trans *llc_stat_dwn_state_trans[] = {
- [0] = &llc_stat_down_state_trans_1,
- [1] = &llc_stat_down_state_trans_2,
- [2] = &llc_stat_state_trans_end,
-};
-
-/* UP STATE transitions */
-/* state transition for LLC_STATION_EV_DISABLE_REQ event */
-static llc_station_action_t llc_stat_up_state_actions_1[] = {
- [0] = llc_station_ac_report_status, /* STATION DOWN */
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_up_state_trans_1 = {
- .ev = llc_stat_ev_disable_req,
- .next_state = LLC_STATION_STATE_DOWN,
- .ev_actions = llc_stat_up_state_actions_1,
-};
-
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_XID_C event */
-static llc_station_action_t llc_stat_up_state_actions_2[] = {
- [0] = llc_station_ac_send_xid_r,
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_up_state_trans_2 = {
- .ev = llc_stat_ev_rx_null_dsap_xid_c,
- .next_state = LLC_STATION_STATE_UP,
- .ev_actions = llc_stat_up_state_actions_2,
-};
-
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_TEST_C event */
-static llc_station_action_t llc_stat_up_state_actions_3[] = {
- [0] = llc_station_ac_send_test_r,
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_up_state_trans_3 = {
- .ev = llc_stat_ev_rx_null_dsap_test_c,
- .next_state = LLC_STATION_STATE_UP,
- .ev_actions = llc_stat_up_state_actions_3,
-};
-
-/* array of pointers; one to each transition */
-static struct llc_station_state_trans *llc_stat_up_state_trans [] = {
- [0] = &llc_stat_up_state_trans_1,
- [1] = &llc_stat_up_state_trans_2,
- [2] = &llc_stat_up_state_trans_3,
- [3] = &llc_stat_state_trans_end,
-};
-
-/* DUP ADDR CHK STATE transitions */
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_0_XID_R_XID_R_CNT_EQ
- * event
- */
-static llc_station_action_t llc_stat_dupaddr_state_actions_1[] = {
- [0] = llc_station_ac_inc_xid_r_cnt_by_1,
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_dupaddr_state_trans_1 = {
- .ev = llc_stat_ev_rx_null_dsap_0_xid_r_xid_r_cnt_eq,
- .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
- .ev_actions = llc_stat_dupaddr_state_actions_1,
-};
-
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_1_XID_R_XID_R_CNT_EQ
- * event
- */
-static llc_station_action_t llc_stat_dupaddr_state_actions_2[] = {
- [0] = llc_station_ac_report_status, /* DUPLICATE ADDRESS FOUND */
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_dupaddr_state_trans_2 = {
- .ev = llc_stat_ev_rx_null_dsap_1_xid_r_xid_r_cnt_eq,
- .next_state = LLC_STATION_STATE_DOWN,
- .ev_actions = llc_stat_dupaddr_state_actions_2,
-};
-
-/* state transition for LLC_STATION_EV_RX_NULL_DSAP_XID_C event */
-static llc_station_action_t llc_stat_dupaddr_state_actions_3[] = {
- [0] = llc_station_ac_send_xid_r,
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_dupaddr_state_trans_3 = {
- .ev = llc_stat_ev_rx_null_dsap_xid_c,
- .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
- .ev_actions = llc_stat_dupaddr_state_actions_3,
-};
-
-/* state transition for LLC_STATION_EV_ACK_TMR_EXP_LT_RETRY_CNT_MAX_RETRY
- * event
- */
-static llc_station_action_t llc_stat_dupaddr_state_actions_4[] = {
- [0] = llc_station_ac_start_ack_timer,
- [1] = llc_station_ac_inc_retry_cnt_by_1,
- [2] = llc_station_ac_set_xid_r_cnt_0,
- [3] = llc_station_ac_send_null_dsap_xid_c,
- [4] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_dupaddr_state_trans_4 = {
- .ev = llc_stat_ev_ack_tmr_exp_lt_retry_cnt_max_retry,
- .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
- .ev_actions = llc_stat_dupaddr_state_actions_4,
-};
-
-/* state transition for LLC_STATION_EV_ACK_TMR_EXP_EQ_RETRY_CNT_MAX_RETRY
- * event
- */
-static llc_station_action_t llc_stat_dupaddr_state_actions_5[] = {
- [0] = llc_station_ac_report_status, /* STATION UP */
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_dupaddr_state_trans_5 = {
- .ev = llc_stat_ev_ack_tmr_exp_eq_retry_cnt_max_retry,
- .next_state = LLC_STATION_STATE_UP,
- .ev_actions = llc_stat_dupaddr_state_actions_5,
-};
-
-/* state transition for LLC_STATION_EV_DISABLE_REQ event */
-static llc_station_action_t llc_stat_dupaddr_state_actions_6[] = {
- [0] = llc_station_ac_report_status, /* STATION DOWN */
- [1] = NULL,
-};
-
-static struct llc_station_state_trans llc_stat_dupaddr_state_trans_6 = {
- .ev = llc_stat_ev_disable_req,
- .next_state = LLC_STATION_STATE_DOWN,
- .ev_actions = llc_stat_dupaddr_state_actions_6,
-};
-
-/* array of pointers; one to each transition */
-static struct llc_station_state_trans *llc_stat_dupaddr_state_trans[] = {
- [0] = &llc_stat_dupaddr_state_trans_6, /* Request */
- [1] = &llc_stat_dupaddr_state_trans_4, /* Timer */
- [2] = &llc_stat_dupaddr_state_trans_5,
- [3] = &llc_stat_dupaddr_state_trans_1, /* Receive frame */
- [4] = &llc_stat_dupaddr_state_trans_2,
- [5] = &llc_stat_dupaddr_state_trans_3,
- [6] = &llc_stat_state_trans_end,
-};
-
-static struct llc_station_state
- llc_station_state_table[LLC_NBR_STATION_STATES] = {
- [LLC_STATION_STATE_DOWN - 1] = {
- .curr_state = LLC_STATION_STATE_DOWN,
- .transitions = llc_stat_dwn_state_trans,
- },
- [LLC_STATION_STATE_DUP_ADDR_CHK - 1] = {
- .curr_state = LLC_STATION_STATE_DUP_ADDR_CHK,
- .transitions = llc_stat_dupaddr_state_trans,
- },
- [LLC_STATION_STATE_UP - 1] = {
- .curr_state = LLC_STATION_STATE_UP,
- .transitions = llc_stat_up_state_trans,
- },
-};
-
-/**
- * llc_exec_station_trans_actions - executes actions for transition
- * @trans: Address of the transition
- * @skb: Address of the event that caused the transition
- *
- * Executes actions of a transition of the station state machine. Returns
- * 0 if all actions complete successfully, nonzero otherwise.
- */
-static u16 llc_exec_station_trans_actions(struct llc_station_state_trans *trans,
- struct sk_buff *skb)
-{
- u16 rc = 0;
- llc_station_action_t *next_action = trans->ev_actions;
-
- for (; next_action && *next_action; next_action++)
- if ((*next_action)(skb))
- rc = 1;
- return rc;
-}
-
-/**
- * llc_find_station_trans - finds transition for this event
- * @skb: Address of the event
- *
- * Search thru events of the current state of the station until list
- * exhausted or it's obvious that the event is not valid for the current
- * state. Returns the address of the transition if cound, %NULL otherwise.
- */
-static struct llc_station_state_trans *
- llc_find_station_trans(struct sk_buff *skb)
-{
- int i = 0;
- struct llc_station_state_trans *rc = NULL;
- struct llc_station_state_trans **next_trans;
- struct llc_station_state *curr_state =
- &llc_station_state_table[llc_main_station.state - 1];
-
- for (next_trans = curr_state->transitions; next_trans[i]->ev; i++)
- if (!next_trans[i]->ev(skb)) {
- rc = next_trans[i];
- break;
- }
- return rc;
-}
-
-/**
- * llc_station_free_ev - frees an event
- * @skb: Address of the event
- *
- * Frees an event.
- */
-static void llc_station_free_ev(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- if (ev->type == LLC_STATION_EV_TYPE_PDU)
- kfree_skb(skb);
-}
-
-/**
- * llc_station_next_state - processes event and goes to the next state
- * @skb: Address of the event
- *
- * Processes an event, executes any transitions related to that event and
- * updates the state of the station.
- */
-static u16 llc_station_next_state(struct sk_buff *skb)
-{
- u16 rc = 1;
- struct llc_station_state_trans *trans;
-
- if (llc_main_station.state > LLC_NBR_STATION_STATES)
- goto out;
- trans = llc_find_station_trans(skb);
- if (trans) {
- /* got the state to which we next transition; perform the
- * actions associated with this transition before actually
- * transitioning to the next state
- */
- rc = llc_exec_station_trans_actions(trans, skb);
- if (!rc)
- /* transition station to next state if all actions
- * execute successfully; done; wait for next event
- */
- llc_main_station.state = trans->next_state;
- } else
- /* event not recognized in current state; re-queue it for
- * processing again at a later time; return failure
- */
- rc = 0;
-out:
- llc_station_free_ev(skb);
- return rc;
-}
-
-/**
- * llc_station_service_events - service events in the queue
- *
- * Get an event from the station event queue (if any); attempt to service
- * the event; if event serviced, get the next event (if any) on the event
- * queue; if event not service, re-queue the event on the event queue and
- * attempt to service the next event; when serviced all events in queue,
- * finished; if don't transition to different state, just service all
- * events once; if transition to new state, service all events again.
- * Caller must hold llc_main_station.ev_q.lock.
- */
-static void llc_station_service_events(void)
-{
- struct sk_buff *skb;
-
- while ((skb = skb_dequeue(&llc_main_station.ev_q.list)) != NULL)
- llc_station_next_state(skb);
-}
-
-/**
- * llc_station_state_process - queue event and try to process queue.
- * @skb: Address of the event
- *
- * Queues an event (on the station event queue) for handling by the
- * station state machine and attempts to process any queued-up events.
- */
-static void llc_station_state_process(struct sk_buff *skb)
-{
- spin_lock_bh(&llc_main_station.ev_q.lock);
- skb_queue_tail(&llc_main_station.ev_q.list, skb);
- llc_station_service_events();
- spin_unlock_bh(&llc_main_station.ev_q.lock);
-}
-
-static void llc_station_ack_tmr_cb(unsigned long timeout_data)
-{
- struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
-
- if (skb) {
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- ev->type = LLC_STATION_EV_TYPE_ACK_TMR;
- llc_station_state_process(skb);
- }
-}
-