2 * llc_station.c - station component of LLC
4 * Copyright (c) 1997 by Procom Technology, Inc.
5 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
7 * This program can be redistributed or modified under the terms of the
8 * GNU General Public License as published by the Free Software Foundation.
9 * This program is distributed without any warranty or implied warranty
10 * of merchantability or fitness for a particular purpose.
12 * See the GNU General Public License for more details.
14 #include <linux/init.h>
15 #include <linux/module.h>
17 #include <net/llc_sap.h>
18 #include <net/llc_conn.h>
19 #include <net/llc_c_ac.h>
20 #include <net/llc_s_ac.h>
21 #include <net/llc_c_ev.h>
22 #include <net/llc_c_st.h>
23 #include <net/llc_s_ev.h>
24 #include <net/llc_s_st.h>
25 #include <net/llc_pdu.h>
28 * struct llc_station - LLC station component
30 * SAP and connection resource manager, one per adapter.
32 * @state - state of station
33 * @xid_r_count - XID response PDU counter
34 * @mac_sa - MAC source address
35 * @sap_list - list of related SAPs
36 * @ev_q - events entering state mach.
37 * @mac_pdu_q - PDUs ready to send to MAC
42 struct timer_list ack_timer;
46 struct sk_buff_head list;
49 struct sk_buff_head mac_pdu_q;
52 #define LLC_STATION_ACK_TIME (3 * HZ)
54 int sysctl_llc_station_ack_timeout = LLC_STATION_ACK_TIME;
56 /* Types of events (possible values in 'ev->type') */
57 #define LLC_STATION_EV_TYPE_SIMPLE 1
58 #define LLC_STATION_EV_TYPE_CONDITION 2
59 #define LLC_STATION_EV_TYPE_PRIM 3
60 #define LLC_STATION_EV_TYPE_PDU 4 /* command/response PDU */
61 #define LLC_STATION_EV_TYPE_ACK_TMR 5
62 #define LLC_STATION_EV_TYPE_RPT_STATUS 6
65 #define LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK 1
66 #define LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK 2
67 #define LLC_STATION_EV_ACK_TMR_EXP_LT_RETRY_CNT_MAX_RETRY 3
68 #define LLC_STATION_EV_ACK_TMR_EXP_EQ_RETRY_CNT_MAX_RETRY 4
69 #define LLC_STATION_EV_RX_NULL_DSAP_XID_C 5
70 #define LLC_STATION_EV_RX_NULL_DSAP_0_XID_R_XID_R_CNT_EQ 6
71 #define LLC_STATION_EV_RX_NULL_DSAP_1_XID_R_XID_R_CNT_EQ 7
72 #define LLC_STATION_EV_RX_NULL_DSAP_TEST_C 8
73 #define LLC_STATION_EV_DISABLE_REQ 9
75 struct llc_station_state_ev {
80 struct list_head node; /* node in station->ev_q.list */
83 static __inline__ struct llc_station_state_ev *
84 llc_station_ev(struct sk_buff *skb)
86 return (struct llc_station_state_ev *)skb->cb;
89 typedef int (*llc_station_ev_t)(struct sk_buff *skb);
91 #define LLC_STATION_STATE_DOWN 1 /* initial state */
92 #define LLC_STATION_STATE_DUP_ADDR_CHK 2
93 #define LLC_STATION_STATE_UP 3
95 #define LLC_NBR_STATION_STATES 3 /* size of state table */
97 typedef int (*llc_station_action_t)(struct sk_buff *skb);
99 /* Station component state table structure */
100 struct llc_station_state_trans {
103 llc_station_action_t *ev_actions;
106 struct llc_station_state {
108 struct llc_station_state_trans **transitions;
111 static struct llc_station llc_main_station;
113 static int llc_stat_ev_enable_with_dup_addr_check(struct sk_buff *skb)
115 struct llc_station_state_ev *ev = llc_station_ev(skb);
117 return ev->type == LLC_STATION_EV_TYPE_SIMPLE &&
119 LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK ? 0 : 1;
122 static int llc_stat_ev_enable_without_dup_addr_check(struct sk_buff *skb)
124 struct llc_station_state_ev *ev = llc_station_ev(skb);
126 return ev->type == LLC_STATION_EV_TYPE_SIMPLE &&
128 LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK ? 0 : 1;
131 static int llc_stat_ev_ack_tmr_exp_lt_retry_cnt_max_retry(struct sk_buff *skb)
133 struct llc_station_state_ev *ev = llc_station_ev(skb);
135 return ev->type == LLC_STATION_EV_TYPE_ACK_TMR &&
136 llc_main_station.retry_count <
137 llc_main_station.maximum_retry ? 0 : 1;
140 static int llc_stat_ev_ack_tmr_exp_eq_retry_cnt_max_retry(struct sk_buff *skb)
142 struct llc_station_state_ev *ev = llc_station_ev(skb);
144 return ev->type == LLC_STATION_EV_TYPE_ACK_TMR &&
145 llc_main_station.retry_count ==
146 llc_main_station.maximum_retry ? 0 : 1;
149 static int llc_stat_ev_rx_null_dsap_xid_c(struct sk_buff *skb)
151 struct llc_station_state_ev *ev = llc_station_ev(skb);
152 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
154 return ev->type == LLC_STATION_EV_TYPE_PDU &&
155 LLC_PDU_IS_CMD(pdu) && /* command PDU */
156 LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
157 LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID &&
158 !pdu->dsap ? 0 : 1; /* NULL DSAP value */
161 static int llc_stat_ev_rx_null_dsap_0_xid_r_xid_r_cnt_eq(struct sk_buff *skb)
163 struct llc_station_state_ev *ev = llc_station_ev(skb);
164 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
166 return ev->type == LLC_STATION_EV_TYPE_PDU &&
167 LLC_PDU_IS_RSP(pdu) && /* response PDU */
168 LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
169 LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID &&
170 !pdu->dsap && /* NULL DSAP value */
171 !llc_main_station.xid_r_count ? 0 : 1;
174 static int llc_stat_ev_rx_null_dsap_1_xid_r_xid_r_cnt_eq(struct sk_buff *skb)
176 struct llc_station_state_ev *ev = llc_station_ev(skb);
177 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
179 return ev->type == LLC_STATION_EV_TYPE_PDU &&
180 LLC_PDU_IS_RSP(pdu) && /* response PDU */
181 LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
182 LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID &&
183 !pdu->dsap && /* NULL DSAP value */
184 llc_main_station.xid_r_count == 1 ? 0 : 1;
187 static int llc_stat_ev_rx_null_dsap_test_c(struct sk_buff *skb)
189 struct llc_station_state_ev *ev = llc_station_ev(skb);
190 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
192 return ev->type == LLC_STATION_EV_TYPE_PDU &&
193 LLC_PDU_IS_CMD(pdu) && /* command PDU */
194 LLC_PDU_TYPE_IS_U(pdu) && /* U type PDU */
195 LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST &&
196 !pdu->dsap ? 0 : 1; /* NULL DSAP */
199 static int llc_stat_ev_disable_req(struct sk_buff *skb)
201 struct llc_station_state_ev *ev = llc_station_ev(skb);
203 return ev->type == LLC_STATION_EV_TYPE_PRIM &&
204 ev->prim == LLC_DISABLE_PRIM &&
205 ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
209 * llc_station_send_pdu - queues PDU to send
210 * @skb: Address of the PDU
212 * Queues a PDU to send to the MAC layer.
214 static void llc_station_send_pdu(struct sk_buff *skb)
216 skb_queue_tail(&llc_main_station.mac_pdu_q, skb);
217 while ((skb = skb_dequeue(&llc_main_station.mac_pdu_q)) != NULL)
218 if (dev_queue_xmit(skb))
222 static int llc_station_ac_start_ack_timer(struct sk_buff *skb)
224 mod_timer(&llc_main_station.ack_timer,
225 jiffies + sysctl_llc_station_ack_timeout);
229 static int llc_station_ac_set_retry_cnt_0(struct sk_buff *skb)
231 llc_main_station.retry_count = 0;
235 static int llc_station_ac_inc_retry_cnt_by_1(struct sk_buff *skb)
237 llc_main_station.retry_count++;
241 static int llc_station_ac_set_xid_r_cnt_0(struct sk_buff *skb)
243 llc_main_station.xid_r_count = 0;
247 static int llc_station_ac_inc_xid_r_cnt_by_1(struct sk_buff *skb)
249 llc_main_station.xid_r_count++;
253 static int llc_station_ac_send_null_dsap_xid_c(struct sk_buff *skb)
256 struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
260 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, 0, LLC_PDU_CMD);
261 llc_pdu_init_as_xid_cmd(nskb, LLC_XID_NULL_CLASS_2, 127);
262 rc = llc_mac_hdr_init(nskb, llc_station_mac_sa, llc_station_mac_sa);
265 llc_station_send_pdu(nskb);
273 static int llc_station_ac_send_xid_r(struct sk_buff *skb)
275 u8 mac_da[ETH_ALEN], dsap;
277 struct sk_buff* nskb = llc_alloc_frame(NULL, skb->dev);
282 llc_pdu_decode_sa(skb, mac_da);
283 llc_pdu_decode_ssap(skb, &dsap);
284 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
285 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 127);
286 rc = llc_mac_hdr_init(nskb, llc_station_mac_sa, mac_da);
289 llc_station_send_pdu(nskb);
297 static int llc_station_ac_send_test_r(struct sk_buff *skb)
299 u8 mac_da[ETH_ALEN], dsap;
301 struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
306 llc_pdu_decode_sa(skb, mac_da);
307 llc_pdu_decode_ssap(skb, &dsap);
308 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
309 llc_pdu_init_as_test_rsp(nskb, skb);
310 rc = llc_mac_hdr_init(nskb, llc_station_mac_sa, mac_da);
313 llc_station_send_pdu(nskb);
321 static int llc_station_ac_report_status(struct sk_buff *skb)
326 /* COMMON STATION STATE transitions */
328 /* dummy last-transition indicator; common to all state transition groups
329 * last entry for this state
330 * all members are zeros, .bss zeroes it
332 static struct llc_station_state_trans llc_stat_state_trans_end;
334 /* DOWN STATE transitions */
336 /* state transition for LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK event */
337 static llc_station_action_t llc_stat_down_state_actions_1[] = {
338 [0] = llc_station_ac_start_ack_timer,
339 [1] = llc_station_ac_set_retry_cnt_0,
340 [2] = llc_station_ac_set_xid_r_cnt_0,
341 [3] = llc_station_ac_send_null_dsap_xid_c,
345 static struct llc_station_state_trans llc_stat_down_state_trans_1 = {
346 .ev = llc_stat_ev_enable_with_dup_addr_check,
347 .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
348 .ev_actions = llc_stat_down_state_actions_1,
351 /* state transition for LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK event */
352 static llc_station_action_t llc_stat_down_state_actions_2[] = {
353 [0] = llc_station_ac_report_status, /* STATION UP */
357 static struct llc_station_state_trans llc_stat_down_state_trans_2 = {
358 .ev = llc_stat_ev_enable_without_dup_addr_check,
359 .next_state = LLC_STATION_STATE_UP,
360 .ev_actions = llc_stat_down_state_actions_2,
363 /* array of pointers; one to each transition */
364 static struct llc_station_state_trans *llc_stat_dwn_state_trans[] = {
365 [0] = &llc_stat_down_state_trans_1,
366 [1] = &llc_stat_down_state_trans_2,
367 [2] = &llc_stat_state_trans_end,
370 /* UP STATE transitions */
371 /* state transition for LLC_STATION_EV_DISABLE_REQ event */
372 static llc_station_action_t llc_stat_up_state_actions_1[] = {
373 [0] = llc_station_ac_report_status, /* STATION DOWN */
377 static struct llc_station_state_trans llc_stat_up_state_trans_1 = {
378 .ev = llc_stat_ev_disable_req,
379 .next_state = LLC_STATION_STATE_DOWN,
380 .ev_actions = llc_stat_up_state_actions_1,
383 /* state transition for LLC_STATION_EV_RX_NULL_DSAP_XID_C event */
384 static llc_station_action_t llc_stat_up_state_actions_2[] = {
385 [0] = llc_station_ac_send_xid_r,
389 static struct llc_station_state_trans llc_stat_up_state_trans_2 = {
390 .ev = llc_stat_ev_rx_null_dsap_xid_c,
391 .next_state = LLC_STATION_STATE_UP,
392 .ev_actions = llc_stat_up_state_actions_2,
395 /* state transition for LLC_STATION_EV_RX_NULL_DSAP_TEST_C event */
396 static llc_station_action_t llc_stat_up_state_actions_3[] = {
397 [0] = llc_station_ac_send_test_r,
401 static struct llc_station_state_trans llc_stat_up_state_trans_3 = {
402 .ev = llc_stat_ev_rx_null_dsap_test_c,
403 .next_state = LLC_STATION_STATE_UP,
404 .ev_actions = llc_stat_up_state_actions_3,
407 /* array of pointers; one to each transition */
408 static struct llc_station_state_trans *llc_stat_up_state_trans [] = {
409 [0] = &llc_stat_up_state_trans_1,
410 [1] = &llc_stat_up_state_trans_2,
411 [2] = &llc_stat_up_state_trans_3,
412 [3] = &llc_stat_state_trans_end,
415 /* DUP ADDR CHK STATE transitions */
416 /* state transition for LLC_STATION_EV_RX_NULL_DSAP_0_XID_R_XID_R_CNT_EQ
419 static llc_station_action_t llc_stat_dupaddr_state_actions_1[] = {
420 [0] = llc_station_ac_inc_xid_r_cnt_by_1,
424 static struct llc_station_state_trans llc_stat_dupaddr_state_trans_1 = {
425 .ev = llc_stat_ev_rx_null_dsap_0_xid_r_xid_r_cnt_eq,
426 .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
427 .ev_actions = llc_stat_dupaddr_state_actions_1,
430 /* state transition for LLC_STATION_EV_RX_NULL_DSAP_1_XID_R_XID_R_CNT_EQ
433 static llc_station_action_t llc_stat_dupaddr_state_actions_2[] = {
434 [0] = llc_station_ac_report_status, /* DUPLICATE ADDRESS FOUND */
438 static struct llc_station_state_trans llc_stat_dupaddr_state_trans_2 = {
439 .ev = llc_stat_ev_rx_null_dsap_1_xid_r_xid_r_cnt_eq,
440 .next_state = LLC_STATION_STATE_DOWN,
441 .ev_actions = llc_stat_dupaddr_state_actions_2,
444 /* state transition for LLC_STATION_EV_RX_NULL_DSAP_XID_C event */
445 static llc_station_action_t llc_stat_dupaddr_state_actions_3[] = {
446 [0] = llc_station_ac_send_xid_r,
450 static struct llc_station_state_trans llc_stat_dupaddr_state_trans_3 = {
451 .ev = llc_stat_ev_rx_null_dsap_xid_c,
452 .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
453 .ev_actions = llc_stat_dupaddr_state_actions_3,
456 /* state transition for LLC_STATION_EV_ACK_TMR_EXP_LT_RETRY_CNT_MAX_RETRY
459 static llc_station_action_t llc_stat_dupaddr_state_actions_4[] = {
460 [0] = llc_station_ac_start_ack_timer,
461 [1] = llc_station_ac_inc_retry_cnt_by_1,
462 [2] = llc_station_ac_set_xid_r_cnt_0,
463 [3] = llc_station_ac_send_null_dsap_xid_c,
467 static struct llc_station_state_trans llc_stat_dupaddr_state_trans_4 = {
468 .ev = llc_stat_ev_ack_tmr_exp_lt_retry_cnt_max_retry,
469 .next_state = LLC_STATION_STATE_DUP_ADDR_CHK,
470 .ev_actions = llc_stat_dupaddr_state_actions_4,
473 /* state transition for LLC_STATION_EV_ACK_TMR_EXP_EQ_RETRY_CNT_MAX_RETRY
476 static llc_station_action_t llc_stat_dupaddr_state_actions_5[] = {
477 [0] = llc_station_ac_report_status, /* STATION UP */
481 static struct llc_station_state_trans llc_stat_dupaddr_state_trans_5 = {
482 .ev = llc_stat_ev_ack_tmr_exp_eq_retry_cnt_max_retry,
483 .next_state = LLC_STATION_STATE_UP,
484 .ev_actions = llc_stat_dupaddr_state_actions_5,
487 /* state transition for LLC_STATION_EV_DISABLE_REQ event */
488 static llc_station_action_t llc_stat_dupaddr_state_actions_6[] = {
489 [0] = llc_station_ac_report_status, /* STATION DOWN */
493 static struct llc_station_state_trans llc_stat_dupaddr_state_trans_6 = {
494 .ev = llc_stat_ev_disable_req,
495 .next_state = LLC_STATION_STATE_DOWN,
496 .ev_actions = llc_stat_dupaddr_state_actions_6,
499 /* array of pointers; one to each transition */
500 static struct llc_station_state_trans *llc_stat_dupaddr_state_trans[] = {
501 [0] = &llc_stat_dupaddr_state_trans_6, /* Request */
502 [1] = &llc_stat_dupaddr_state_trans_4, /* Timer */
503 [2] = &llc_stat_dupaddr_state_trans_5,
504 [3] = &llc_stat_dupaddr_state_trans_1, /* Receive frame */
505 [4] = &llc_stat_dupaddr_state_trans_2,
506 [5] = &llc_stat_dupaddr_state_trans_3,
507 [6] = &llc_stat_state_trans_end,
510 static struct llc_station_state
511 llc_station_state_table[LLC_NBR_STATION_STATES] = {
512 [LLC_STATION_STATE_DOWN - 1] = {
513 .curr_state = LLC_STATION_STATE_DOWN,
514 .transitions = llc_stat_dwn_state_trans,
516 [LLC_STATION_STATE_DUP_ADDR_CHK - 1] = {
517 .curr_state = LLC_STATION_STATE_DUP_ADDR_CHK,
518 .transitions = llc_stat_dupaddr_state_trans,
520 [LLC_STATION_STATE_UP - 1] = {
521 .curr_state = LLC_STATION_STATE_UP,
522 .transitions = llc_stat_up_state_trans,
527 * llc_exec_station_trans_actions - executes actions for transition
528 * @trans: Address of the transition
529 * @skb: Address of the event that caused the transition
531 * Executes actions of a transition of the station state machine. Returns
532 * 0 if all actions complete successfully, nonzero otherwise.
534 static u16 llc_exec_station_trans_actions(struct llc_station_state_trans *trans,
538 llc_station_action_t *next_action = trans->ev_actions;
540 for (; next_action && *next_action; next_action++)
541 if ((*next_action)(skb))
547 * llc_find_station_trans - finds transition for this event
548 * @skb: Address of the event
550 * Search thru events of the current state of the station until list
551 * exhausted or it's obvious that the event is not valid for the current
552 * state. Returns the address of the transition if cound, %NULL otherwise.
554 static struct llc_station_state_trans *
555 llc_find_station_trans(struct sk_buff *skb)
558 struct llc_station_state_trans *rc = NULL;
559 struct llc_station_state_trans **next_trans;
560 struct llc_station_state *curr_state =
561 &llc_station_state_table[llc_main_station.state - 1];
563 for (next_trans = curr_state->transitions; next_trans[i]->ev; i++)
564 if (!next_trans[i]->ev(skb)) {
572 * llc_station_free_ev - frees an event
573 * @skb: Address of the event
577 static void llc_station_free_ev(struct sk_buff *skb)
579 struct llc_station_state_ev *ev = llc_station_ev(skb);
581 if (ev->type == LLC_STATION_EV_TYPE_PDU)
586 * llc_station_next_state - processes event and goes to the next state
587 * @skb: Address of the event
589 * Processes an event, executes any transitions related to that event and
590 * updates the state of the station.
592 static u16 llc_station_next_state(struct sk_buff *skb)
595 struct llc_station_state_trans *trans;
597 if (llc_main_station.state > LLC_NBR_STATION_STATES)
599 trans = llc_find_station_trans(skb);
601 /* got the state to which we next transition; perform the
602 * actions associated with this transition before actually
603 * transitioning to the next state
605 rc = llc_exec_station_trans_actions(trans, skb);
607 /* transition station to next state if all actions
608 * execute successfully; done; wait for next event
610 llc_main_station.state = trans->next_state;
612 /* event not recognized in current state; re-queue it for
613 * processing again at a later time; return failure
617 llc_station_free_ev(skb);
622 * llc_station_service_events - service events in the queue
624 * Get an event from the station event queue (if any); attempt to service
625 * the event; if event serviced, get the next event (if any) on the event
626 * queue; if event not service, re-queue the event on the event queue and
627 * attempt to service the next event; when serviced all events in queue,
628 * finished; if don't transition to different state, just service all
629 * events once; if transition to new state, service all events again.
630 * Caller must hold llc_main_station.ev_q.lock.
632 static void llc_station_service_events(void)
636 while ((skb = skb_dequeue(&llc_main_station.ev_q.list)) != NULL)
637 llc_station_next_state(skb);
641 * llc_station_state_process: queue event and try to process queue.
642 * @skb: Address of the event
644 * Queues an event (on the station event queue) for handling by the
645 * station state machine and attempts to process any queued-up events.
647 static void llc_station_state_process(struct sk_buff *skb)
649 spin_lock_bh(&llc_main_station.ev_q.lock);
650 skb_queue_tail(&llc_main_station.ev_q.list, skb);
651 llc_station_service_events();
652 spin_unlock_bh(&llc_main_station.ev_q.lock);
655 static void llc_station_ack_tmr_cb(unsigned long timeout_data)
657 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
660 struct llc_station_state_ev *ev = llc_station_ev(skb);
662 ev->type = LLC_STATION_EV_TYPE_ACK_TMR;
663 llc_station_state_process(skb);
668 * llc_station_rcv - send received pdu to the station state machine
669 * @skb: received frame.
671 * Sends data unit to station state machine.
673 static void llc_station_rcv(struct sk_buff *skb)
675 struct llc_station_state_ev *ev = llc_station_ev(skb);
677 ev->type = LLC_STATION_EV_TYPE_PDU;
679 llc_station_state_process(skb);
682 int __init llc_station_init(void)
686 struct llc_station_state_ev *ev;
688 skb_queue_head_init(&llc_main_station.mac_pdu_q);
689 skb_queue_head_init(&llc_main_station.ev_q.list);
690 spin_lock_init(&llc_main_station.ev_q.lock);
691 setup_timer(&llc_main_station.ack_timer, llc_station_ack_tmr_cb,
692 (unsigned long)&llc_main_station);
693 llc_main_station.ack_timer.expires = jiffies +
694 sysctl_llc_station_ack_timeout;
695 skb = alloc_skb(0, GFP_ATOMIC);
699 llc_set_station_handler(llc_station_rcv);
700 ev = llc_station_ev(skb);
701 memset(ev, 0, sizeof(*ev));
702 llc_main_station.maximum_retry = 1;
703 llc_main_station.state = LLC_STATION_STATE_DOWN;
704 ev->type = LLC_STATION_EV_TYPE_SIMPLE;
705 ev->prim_type = LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK;
706 rc = llc_station_next_state(skb);
711 void __exit llc_station_exit(void)
713 llc_set_station_handler(NULL);