*
* SAP and connection resource manager, one per adapter.
*
- * @state: state of station
- * @xid_r_count: XID response PDU counter
* @mac_sa: MAC source address
* @sap_list: list of related SAPs
* @ev_q: events entering state mach.
* @mac_pdu_q: PDUs ready to send to MAC
*/
struct llc_station {
- u8 state;
- u8 xid_r_count;
- struct timer_list ack_timer;
- u8 retry_count;
- u8 maximum_retry;
struct {
struct sk_buff_head list;
spinlock_t lock;
struct sk_buff_head mac_pdu_q;
};
-#define LLC_STATION_ACK_TIME (3 * HZ)
-
-int sysctl_llc_station_ack_timeout = LLC_STATION_ACK_TIME;
-
-/* Types of events (possible values in 'ev->type') */
-#define LLC_STATION_EV_TYPE_SIMPLE 1
-#define LLC_STATION_EV_TYPE_CONDITION 2
-#define LLC_STATION_EV_TYPE_PRIM 3
-#define LLC_STATION_EV_TYPE_PDU 4 /* command/response PDU */
-#define LLC_STATION_EV_TYPE_ACK_TMR 5
-#define LLC_STATION_EV_TYPE_RPT_STATUS 6
-
-/* Events */
-#define LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK 1
-#define LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK 2
-#define LLC_STATION_EV_ACK_TMR_EXP_LT_RETRY_CNT_MAX_RETRY 3
-#define LLC_STATION_EV_ACK_TMR_EXP_EQ_RETRY_CNT_MAX_RETRY 4
-#define LLC_STATION_EV_RX_NULL_DSAP_XID_C 5
-#define LLC_STATION_EV_RX_NULL_DSAP_0_XID_R_XID_R_CNT_EQ 6
-#define LLC_STATION_EV_RX_NULL_DSAP_1_XID_R_XID_R_CNT_EQ 7
-#define LLC_STATION_EV_RX_NULL_DSAP_TEST_C 8
-#define LLC_STATION_EV_DISABLE_REQ 9
-
-struct llc_station_state_ev {
- u8 type;
- u8 prim;
- u8 prim_type;
- u8 reason;
- struct list_head node; /* node in station->ev_q.list */
-};
-
-static __inline__ struct llc_station_state_ev *
- llc_station_ev(struct sk_buff *skb)
-{
- return (struct llc_station_state_ev *)skb->cb;
-}
-
typedef int (*llc_station_ev_t)(struct sk_buff *skb);
-#define LLC_STATION_STATE_DOWN 1 /* initial state */
-#define LLC_STATION_STATE_DUP_ADDR_CHK 2
-#define LLC_STATION_STATE_UP 3
-
-#define LLC_NBR_STATION_STATES 3 /* size of state table */
-
typedef int (*llc_station_action_t)(struct sk_buff *skb);
/* Station component state table structure */
struct llc_station_state_trans {
llc_station_ev_t ev;
- u8 next_state;
llc_station_action_t *ev_actions;
};
-struct llc_station_state {
- u8 curr_state;
- struct llc_station_state_trans **transitions;
-};
-
static struct llc_station llc_main_station;
-static int llc_stat_ev_enable_with_dup_addr_check(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_SIMPLE &&
- ev->prim_type ==
- LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK ? 0 : 1;
-}
-
-static int llc_stat_ev_enable_without_dup_addr_check(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_SIMPLE &&
- ev->prim_type ==
- LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK ? 0 : 1;
-}
-
-static int llc_stat_ev_ack_tmr_exp_lt_retry_cnt_max_retry(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_ACK_TMR &&
- llc_main_station.retry_count <
- llc_main_station.maximum_retry ? 0 : 1;
-}
-
-static int llc_stat_ev_ack_tmr_exp_eq_retry_cnt_max_retry(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_ACK_TMR &&
- llc_main_station.retry_count ==
- llc_main_station.maximum_retry ? 0 : 1;
-}
-
static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff *skb)
{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
- return ev->type == LLC_STATION_EV_TYPE_PDU &&
- LLC_PDU_IS_CMD(pdu) && /* command PDU */
+ return LLC_PDU_IS_CMD(pdu) && /* command PDU */
LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID &&
!pdu->dsap ? 0 : 1; /* NULL DSAP value */
}
-static int llc_stat_ev_rx_null_dsap_0_xid_r_xid_r_cnt_eq(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
- struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_PDU &&
- LLC_PDU_IS_RSP(pdu) && /* response PDU */
- LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
- LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID &&
- !pdu->dsap && /* NULL DSAP value */
- !llc_main_station.xid_r_count ? 0 : 1;
-}
-
-static int llc_stat_ev_rx_null_dsap_1_xid_r_xid_r_cnt_eq(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
- struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_PDU &&
- LLC_PDU_IS_RSP(pdu) && /* response PDU */
- LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
- LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID &&
- !pdu->dsap && /* NULL DSAP value */
- llc_main_station.xid_r_count == 1 ? 0 : 1;
-}
-
static int llc_stat_ev_rx_null_dsap_test_c(struct sk_buff *skb)
{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
- return ev->type == LLC_STATION_EV_TYPE_PDU &&
- LLC_PDU_IS_CMD(pdu) && /* command PDU */
+ return LLC_PDU_IS_CMD(pdu) && /* command PDU */
LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST &&
!pdu->dsap ? 0 : 1; /* NULL DSAP */
}
-static int llc_stat_ev_disable_req(struct sk_buff *skb)
-{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- return ev->type == LLC_STATION_EV_TYPE_PRIM &&
- ev->prim == LLC_DISABLE_PRIM &&
- ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
-}
-
/**
* llc_station_send_pdu - queues PDU to send
* @skb: Address of the PDU
break;
}
-static int llc_station_ac_start_ack_timer(struct sk_buff *skb)
-{
- mod_timer(&llc_main_station.ack_timer,
- jiffies + sysctl_llc_station_ack_timeout);
- return 0;
-}
-
-static int llc_station_ac_set_retry_cnt_0(struct sk_buff *skb)
-{
- llc_main_station.retry_count = 0;
- return 0;
-}
-
-static int llc_station_ac_inc_retry_cnt_by_1(struct sk_buff *skb)
-{
- llc_main_station.retry_count++;
- return 0;
-}
-
-static int llc_station_ac_set_xid_r_cnt_0(struct sk_buff *skb)
-{
- llc_main_station.xid_r_count = 0;
- return 0;
-}
-
-static int llc_station_ac_inc_xid_r_cnt_by_1(struct sk_buff *skb)
-{
- llc_main_station.xid_r_count++;
- return 0;
-}
-
-static int llc_station_ac_send_null_dsap_xid_c(struct sk_buff *skb)
-{
- int rc = 1;
- struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
- sizeof(struct llc_xid_info));
-
- if (!nskb)
- goto out;
- llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, 0, LLC_PDU_CMD);
- llc_pdu_init_as_xid_cmd(nskb, LLC_XID_NULL_CLASS_2, 127);
- rc = llc_mac_hdr_init(nskb, skb->dev->dev_addr, skb->dev->dev_addr);
- if (unlikely(rc))
- goto free;
- llc_station_send_pdu(nskb);
-out:
- return rc;
-free:
- kfree_skb(nskb);
- goto out;
-}
-
static int llc_station_ac_send_xid_r(struct sk_buff *skb)
{
u8 mac_da[ETH_ALEN], dsap;
goto out;
}
-static int llc_station_ac_report_status(struct sk_buff *skb)
-{
- return 0;
-}
-
-/* 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] = NULL,
-};
-
-/* 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,
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,
};
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] = NULL,
-};
-
-/* 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] = NULL,
-};
-
-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_stat_up_state_trans_2,
+ &llc_stat_up_state_trans_3,
+ NULL,
};
/**
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]; i++)
+ for (next_trans = llc_stat_up_state_trans; next_trans[i]; i++)
if (!next_trans[i]->ev(skb)) {
rc = next_trans[i];
break;
*/
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);
+ kfree_skb(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) {
+ 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
+ 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;
}
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);
- }
-}
-
/**
* llc_station_rcv - send received pdu to the station state machine
* @skb: received frame.
*/
static void llc_station_rcv(struct sk_buff *skb)
{
- struct llc_station_state_ev *ev = llc_station_ev(skb);
-
- ev->type = LLC_STATION_EV_TYPE_PDU;
- ev->reason = 0;
llc_station_state_process(skb);
}
skb_queue_head_init(&llc_main_station.mac_pdu_q);
skb_queue_head_init(&llc_main_station.ev_q.list);
spin_lock_init(&llc_main_station.ev_q.lock);
- setup_timer(&llc_main_station.ack_timer, llc_station_ack_tmr_cb,
- (unsigned long)&llc_main_station);
- llc_main_station.ack_timer.expires = jiffies +
- sysctl_llc_station_ack_timeout;
- llc_main_station.maximum_retry = 1;
- llc_main_station.state = LLC_STATION_STATE_UP;
llc_set_station_handler(llc_station_rcv);
}
projects / platform / kernel / linux-rpi.git / commitdiff