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[TG3]: Add tagged status support.
[linux-2.6/verdex.git] / net / llc / llc_c_ac.c
blobb218be4c10ec44092e59deb2fdc149e027d7da79
1 /*
2 * llc_c_ac.c - actions performed during connection state transition.
3 *
4 * Description:
5 * Functions in this module are implementation of connection component actions
6 * Details of actions can be found in IEEE-802.2 standard document.
7 * All functions have one connection and one event as input argument. All of
8 * them return 0 On success and 1 otherwise.
9 *
10 * Copyright (c) 1997 by Procom Technology, Inc.
11 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
12 *
13 * This program can be redistributed or modified under the terms of the
14 * GNU General Public License as published by the Free Software Foundation.
15 * This program is distributed without any warranty or implied warranty
16 * of merchantability or fitness for a particular purpose.
17 *
18 * See the GNU General Public License for more details.
19 */
20 #include <linux/netdevice.h>
21 #include <net/llc_conn.h>
22 #include <net/llc_sap.h>
23 #include <net/sock.h>
24 #include <net/llc_c_ev.h>
25 #include <net/llc_c_ac.h>
26 #include <net/llc_c_st.h>
27 #include <net/llc_pdu.h>
28 #include <net/llc.h>
29
30 #include "llc_output.h"
31
32 static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb);
33 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb);
34 static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev);
35
36 static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb);
37
38 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
39 struct sk_buff *skb);
40
41 static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb);
42
43 #define INCORRECT 0
44
45 int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb)
46 {
47 struct llc_sock *llc = llc_sk(sk);
48
49 if (llc->remote_busy_flag) {
50 u8 nr;
51 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
52
53 llc->remote_busy_flag = 0;
54 del_timer(&llc->busy_state_timer.timer);
55 nr = LLC_I_GET_NR(pdu);
56 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
57 }
58 return 0;
59 }
60
61 int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb)
62 {
63 int rc = -ENOTCONN;
64 u8 dsap;
65 struct llc_sap *sap;
66
67 llc_pdu_decode_dsap(skb, &dsap);
68 sap = llc_sap_find(dsap);
69 if (sap) {
70 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
71 struct llc_sock *llc = llc_sk(sk);
72
73 llc_pdu_decode_sa(skb, llc->daddr.mac);
74 llc_pdu_decode_da(skb, llc->laddr.mac);
75 llc->dev = skb->dev;
76 ev->ind_prim = LLC_CONN_PRIM;
77 rc = 0;
78 }
79 return rc;
80 }
81
82 int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
83 {
84 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
85
86 ev->cfm_prim = LLC_CONN_PRIM;
87 return 0;
88 }
89
90 static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb)
91 {
92 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
93
94 ev->cfm_prim = LLC_DATA_PRIM;
95 return 0;
96 }
97
98 int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb)
99 {
100 llc_conn_rtn_pdu(sk, skb);
101 return 0;
102 }
103
104 int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
105 {
106 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
107 u8 reason = 0;
108 int rc = 0;
109
110 if (ev->type == LLC_CONN_EV_TYPE_PDU) {
111 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
112
113 if (LLC_PDU_IS_RSP(pdu) &&
114 LLC_PDU_TYPE_IS_U(pdu) &&
115 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM)
116 reason = LLC_DISC_REASON_RX_DM_RSP_PDU;
117 else if (LLC_PDU_IS_CMD(pdu) &&
118 LLC_PDU_TYPE_IS_U(pdu) &&
119 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC)
120 reason = LLC_DISC_REASON_RX_DISC_CMD_PDU;
121 } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR)
122 reason = LLC_DISC_REASON_ACK_TMR_EXP;
123 else {
124 reason = 0;
125 rc = -EINVAL;
126 }
127 if (!rc) {
128 ev->reason = reason;
129 ev->ind_prim = LLC_DISC_PRIM;
130 }
131 return rc;
132 }
133
134 int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
135 {
136 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
137
138 ev->reason = ev->status;
139 ev->cfm_prim = LLC_DISC_PRIM;
140 return 0;
141 }
142
143 int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
144 {
145 u8 reason = 0;
146 int rc = 1;
147 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
148 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
149 struct llc_sock *llc = llc_sk(sk);
150
151 switch (ev->type) {
152 case LLC_CONN_EV_TYPE_PDU:
153 if (LLC_PDU_IS_RSP(pdu) &&
154 LLC_PDU_TYPE_IS_U(pdu) &&
155 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) {
156 reason = LLC_RESET_REASON_LOCAL;
157 rc = 0;
158 } else if (LLC_PDU_IS_CMD(pdu) &&
159 LLC_PDU_TYPE_IS_U(pdu) &&
160 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
161 reason = LLC_RESET_REASON_REMOTE;
162 rc = 0;
163 } else {
164 reason = 0;
165 rc = 1;
166 }
167 break;
168 case LLC_CONN_EV_TYPE_ACK_TMR:
169 case LLC_CONN_EV_TYPE_P_TMR:
170 case LLC_CONN_EV_TYPE_REJ_TMR:
171 case LLC_CONN_EV_TYPE_BUSY_TMR:
172 if (llc->retry_count > llc->n2) {
173 reason = LLC_RESET_REASON_LOCAL;
174 rc = 0;
175 } else
176 rc = 1;
177 break;
178 }
179 if (!rc) {
180 ev->reason = reason;
181 ev->ind_prim = LLC_RESET_PRIM;
182 }
183 return rc;
184 }
185
186 int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
187 {
188 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
189
190 ev->reason = 0;
191 ev->cfm_prim = LLC_RESET_PRIM;
192 return 0;
193 }
194
195 int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk,
196 struct sk_buff *skb)
197 {
198 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
199
200 if (LLC_PDU_IS_RSP(pdu) &&
201 LLC_PDU_TYPE_IS_I(pdu) &&
202 LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf)
203 llc_conn_ac_clear_remote_busy(sk, skb);
204 return 0;
205 }
206
207 int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
208 struct sk_buff *skb)
209 {
210 struct llc_sock *llc = llc_sk(sk);
211
212 if (llc->data_flag == 2)
213 del_timer(&llc->rej_sent_timer.timer);
214 return 0;
215 }
216
217 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
218 {
219 int rc = -ENOBUFS;
220 struct sk_buff *nskb = llc_alloc_frame();
221
222 if (nskb) {
223 struct llc_sock *llc = llc_sk(sk);
224 struct llc_sap *sap = llc->sap;
225
226 nskb->dev = llc->dev;
227 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
228 llc->daddr.lsap, LLC_PDU_CMD);
229 llc_pdu_init_as_disc_cmd(nskb, 1);
230 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
231 if (rc)
232 goto free;
233 llc_conn_send_pdu(sk, nskb);
234 llc_conn_ac_set_p_flag_1(sk, skb);
235 }
236 out:
237 return rc;
238 free:
239 kfree_skb(nskb);
240 goto out;
241 }
242
243 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
244 {
245 int rc = -ENOBUFS;
246 struct sk_buff *nskb = llc_alloc_frame();
247
248 if (nskb) {
249 struct llc_sock *llc = llc_sk(sk);
250 struct llc_sap *sap = llc->sap;
251 u8 f_bit;
252
253 nskb->dev = llc->dev;
254 llc_pdu_decode_pf_bit(skb, &f_bit);
255 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
256 llc->daddr.lsap, LLC_PDU_RSP);
257 llc_pdu_init_as_dm_rsp(nskb, f_bit);
258 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
259 if (rc)
260 goto free;
261 llc_conn_send_pdu(sk, nskb);
262 }
263 out:
264 return rc;
265 free:
266 kfree_skb(nskb);
267 goto out;
268 }
269
270 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
271 {
272 int rc = -ENOBUFS;
273 struct sk_buff *nskb = llc_alloc_frame();
274
275 if (nskb) {
276 struct llc_sock *llc = llc_sk(sk);
277 struct llc_sap *sap = llc->sap;
278 u8 f_bit = 1;
279
280 nskb->dev = llc->dev;
281 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
282 llc->daddr.lsap, LLC_PDU_RSP);
283 llc_pdu_init_as_dm_rsp(nskb, f_bit);
284 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
285 if (rc)
286 goto free;
287 llc_conn_send_pdu(sk, nskb);
288 }
289 out:
290 return rc;
291 free:
292 kfree_skb(nskb);
293 goto out;
294 }
295
296 int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
297 {
298 u8 f_bit;
299 int rc = -ENOBUFS;
300 struct sk_buff *nskb;
301 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
302 struct llc_sock *llc = llc_sk(sk);
303
304 llc->rx_pdu_hdr = *((u32 *)pdu);
305 if (LLC_PDU_IS_CMD(pdu))
306 llc_pdu_decode_pf_bit(skb, &f_bit);
307 else
308 f_bit = 0;
309 nskb = llc_alloc_frame();
310 if (nskb) {
311 struct llc_sap *sap = llc->sap;
312
313 nskb->dev = llc->dev;
314 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
315 llc->daddr.lsap, LLC_PDU_RSP);
316 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
317 llc->vR, INCORRECT);
318 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
319 if (rc)
320 goto free;
321 llc_conn_send_pdu(sk, nskb);
322 }
323 out:
324 return rc;
325 free:
326 kfree_skb(nskb);
327 goto out;
328 }
329
330 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
331 {
332 int rc = -ENOBUFS;
333 struct sk_buff *nskb = llc_alloc_frame();
334
335 if (nskb) {
336 u8 f_bit = 0;
337 struct llc_sock *llc = llc_sk(sk);
338 struct llc_sap *sap = llc->sap;
339 struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
340
341 nskb->dev = llc->dev;
342 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
343 llc->daddr.lsap, LLC_PDU_RSP);
344 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
345 llc->vR, INCORRECT);
346 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
347 if (rc)
348 goto free;
349 llc_conn_send_pdu(sk, nskb);
350 }
351 out:
352 return rc;
353 free:
354 kfree_skb(nskb);
355 goto out;
356 }
357
358 int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
359 {
360 u8 f_bit;
361 int rc = -ENOBUFS;
362 struct sk_buff *nskb;
363
364 llc_pdu_decode_pf_bit(skb, &f_bit);
365 nskb = llc_alloc_frame();
366 if (nskb) {
367 struct llc_sock *llc = llc_sk(sk);
368 struct llc_sap *sap = llc->sap;
369 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
370
371 nskb->dev = llc->dev;
372 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
373 llc->daddr.lsap, LLC_PDU_RSP);
374 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
375 llc->vR, INCORRECT);
376 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
377 if (rc)
378 goto free;
379 llc_conn_send_pdu(sk, nskb);
380 }
381 out:
382 return rc;
383 free:
384 kfree_skb(nskb);
385 goto out;
386 }
387
388 int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
389 {
390 int rc;
391 struct llc_sock *llc = llc_sk(sk);
392 struct llc_sap *sap = llc->sap;
393
394 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
395 llc->daddr.lsap, LLC_PDU_CMD);
396 llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
397 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
398 if (!rc) {
399 llc_conn_send_pdu(sk, skb);
400 llc_conn_ac_inc_vs_by_1(sk, skb);
401 }
402 return rc;
403 }
404
405 static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
406 {
407 int rc;
408 struct llc_sock *llc = llc_sk(sk);
409 struct llc_sap *sap = llc->sap;
410
411 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
412 llc->daddr.lsap, LLC_PDU_CMD);
413 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
414 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
415 if (!rc) {
416 llc_conn_send_pdu(sk, skb);
417 llc_conn_ac_inc_vs_by_1(sk, skb);
418 }
419 return rc;
420 }
421
422 int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
423 {
424 int rc;
425 struct llc_sock *llc = llc_sk(sk);
426 struct llc_sap *sap = llc->sap;
427
428 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
429 llc->daddr.lsap, LLC_PDU_CMD);
430 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
431 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
432 if (!rc) {
433 llc_conn_send_pdu(sk, skb);
434 llc_conn_ac_inc_vs_by_1(sk, skb);
435 }
436 return 0;
437 }
438
439 int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
440 {
441 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
442 u8 nr = LLC_I_GET_NR(pdu);
443
444 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
445 return 0;
446 }
447
448 int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
449 struct sk_buff *skb)
450 {
451 u8 nr;
452 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
453 int rc = -ENOBUFS;
454 struct sk_buff *nskb = llc_alloc_frame();
455
456 if (nskb) {
457 struct llc_sock *llc = llc_sk(sk);
458 struct llc_sap *sap = llc->sap;
459
460 nskb->dev = llc->dev;
461 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
462 llc->daddr.lsap, LLC_PDU_RSP);
463 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
464 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
465 if (!rc)
466 llc_conn_send_pdu(sk, nskb);
467 else
468 kfree_skb(skb);
469 }
470 if (rc) {
471 nr = LLC_I_GET_NR(pdu);
472 rc = 0;
473 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
474 }
475 return rc;
476 }
477
478 int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
479 {
480 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
481 u8 nr = LLC_I_GET_NR(pdu);
482
483 llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
484 return 0;
485 }
486
487 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
488 {
489 int rc = -ENOBUFS;
490 struct sk_buff *nskb = llc_alloc_frame();
491
492 if (nskb) {
493 struct llc_sock *llc = llc_sk(sk);
494 struct llc_sap *sap = llc->sap;
495
496 nskb->dev = llc->dev;
497 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
498 llc->daddr.lsap, LLC_PDU_CMD);
499 llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
500 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
501 if (rc)
502 goto free;
503 llc_conn_send_pdu(sk, nskb);
504 }
505 out:
506 return rc;
507 free:
508 kfree_skb(nskb);
509 goto out;
510 }
511
512 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
513 {
514 int rc = -ENOBUFS;
515 struct sk_buff *nskb = llc_alloc_frame();
516
517 if (nskb) {
518 u8 f_bit = 1;
519 struct llc_sock *llc = llc_sk(sk);
520 struct llc_sap *sap = llc->sap;
521
522 nskb->dev = llc->dev;
523 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
524 llc->daddr.lsap, LLC_PDU_RSP);
525 llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
526 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
527 if (rc)
528 goto free;
529 llc_conn_send_pdu(sk, nskb);
530 }
531 out:
532 return rc;
533 free:
534 kfree_skb(nskb);
535 goto out;
536 }
537
538 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
539 {
540 int rc = -ENOBUFS;
541 struct sk_buff *nskb = llc_alloc_frame();
542
543 if (nskb) {
544 struct llc_sock *llc = llc_sk(sk);
545 struct llc_sap *sap = llc->sap;
546 u8 f_bit = 0;
547
548 nskb->dev = llc->dev;
549 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
550 llc->daddr.lsap, LLC_PDU_RSP);
551 llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
552 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
553 if (rc)
554 goto free;
555 llc_conn_send_pdu(sk, nskb);
556 }
557 out:
558 return rc;
559 free:
560 kfree_skb(nskb);
561 goto out;
562 }
563
564 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
565 {
566 int rc = -ENOBUFS;
567 struct sk_buff *nskb = llc_alloc_frame();
568
569 if (nskb) {
570 struct llc_sock *llc = llc_sk(sk);
571 struct llc_sap *sap = llc->sap;
572
573 nskb->dev = llc->dev;
574 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
575 llc->daddr.lsap, LLC_PDU_CMD);
576 llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
577 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
578 if (rc)
579 goto free;
580 llc_conn_send_pdu(sk, nskb);
581 }
582 out:
583 return rc;
584 free:
585 kfree_skb(nskb);
586 goto out;
587 }
588
589 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
590 {
591 int rc = -ENOBUFS;
592 struct sk_buff *nskb = llc_alloc_frame();
593
594 if (nskb) {
595 struct llc_sock *llc = llc_sk(sk);
596 struct llc_sap *sap = llc->sap;
597 u8 f_bit = 1;
598
599 nskb->dev = llc->dev;
600 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
601 llc->daddr.lsap, LLC_PDU_RSP);
602 llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
603 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
604 if (rc)
605 goto free;
606 llc_conn_send_pdu(sk, nskb);
607 }
608 out:
609 return rc;
610 free:
611 kfree_skb(nskb);
612 goto out;
613 }
614
615 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
616 {
617 int rc = -ENOBUFS;
618 struct sk_buff *nskb = llc_alloc_frame();
619
620 if (nskb) {
621 u8 f_bit = 0;
622 struct llc_sock *llc = llc_sk(sk);
623 struct llc_sap *sap = llc->sap;
624
625 nskb->dev = llc->dev;
626 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
627 llc->daddr.lsap, LLC_PDU_RSP);
628 llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
629 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
630 if (rc)
631 goto free;
632 llc_conn_send_pdu(sk, nskb);
633 }
634 out:
635 return rc;
636 free:
637 kfree_skb(nskb);
638 goto out;
639 }
640
641 int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
642 {
643 struct llc_sock *llc = llc_sk(sk);
644
645 if (!llc->remote_busy_flag) {
646 llc->remote_busy_flag = 1;
647 mod_timer(&llc->busy_state_timer.timer,
648 jiffies + llc->busy_state_timer.expire * HZ);
649 }
650 return 0;
651 }
652
653 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
654 {
655 int rc = -ENOBUFS;
656 struct sk_buff *nskb = llc_alloc_frame();
657
658 if (nskb) {
659 struct llc_sock *llc = llc_sk(sk);
660 struct llc_sap *sap = llc->sap;
661
662 nskb->dev = llc->dev;
663 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
664 llc->daddr.lsap, LLC_PDU_RSP);
665 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
666 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
667 if (rc)
668 goto free;
669 llc_conn_send_pdu(sk, nskb);
670 }
671 out:
672 return rc;
673 free:
674 kfree_skb(nskb);
675 goto out;
676 }
677
678 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
679 {
680 int rc = -ENOBUFS;
681 struct sk_buff *nskb = llc_alloc_frame();
682
683 if (nskb) {
684 struct llc_sock *llc = llc_sk(sk);
685 struct llc_sap *sap = llc->sap;
686
687 nskb->dev = llc->dev;
688 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
689 llc->daddr.lsap, LLC_PDU_CMD);
690 llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
691 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
692 if (rc)
693 goto free;
694 llc_conn_send_pdu(sk, nskb);
695 }
696 out:
697 return rc;
698 free:
699 kfree_skb(nskb);
700 goto out;
701 }
702
703 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
704 {
705 int rc = -ENOBUFS;
706 struct sk_buff *nskb = llc_alloc_frame();
707
708 if (nskb) {
709 struct llc_sock *llc = llc_sk(sk);
710 struct llc_sap *sap = llc->sap;
711 u8 f_bit = 1;
712
713 nskb->dev = llc->dev;
714 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
715 llc->daddr.lsap, LLC_PDU_RSP);
716 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
717 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
718 if (rc)
719 goto free;
720 llc_conn_send_pdu(sk, nskb);
721 }
722 out:
723 return rc;
724 free:
725 kfree_skb(nskb);
726 goto out;
727 }
728
729 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
730 {
731 int rc = -ENOBUFS;
732 struct sk_buff *nskb = llc_alloc_frame();
733
734 if (nskb) {
735 struct llc_sock *llc = llc_sk(sk);
736 struct llc_sap *sap = llc->sap;
737 u8 f_bit = 1;
738
739 nskb->dev = llc->dev;
740 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
741 llc->daddr.lsap, LLC_PDU_RSP);
742 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
743 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
744 if (rc)
745 goto free;
746 llc_conn_send_pdu(sk, nskb);
747 }
748 out:
749 return rc;
750 free:
751 kfree_skb(nskb);
752 goto out;
753 }
754
755 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
756 {
757 int rc = -ENOBUFS;
758 struct sk_buff *nskb = llc_alloc_frame();
759
760 if (nskb) {
761 struct llc_sock *llc = llc_sk(sk);
762 struct llc_sap *sap = llc->sap;
763
764 nskb->dev = llc->dev;
765 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
766 llc->daddr.lsap, LLC_PDU_RSP);
767 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
768 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
769 if (rc)
770 goto free;
771 llc_conn_send_pdu(sk, nskb);
772 }
773 out:
774 return rc;
775 free:
776 kfree_skb(nskb);
777 goto out;
778 }
779
780 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
781 {
782 int rc = -ENOBUFS;
783 struct sk_buff *nskb = llc_alloc_frame();
784
785 if (nskb) {
786 struct llc_sock *llc = llc_sk(sk);
787 struct llc_sap *sap = llc->sap;
788
789 nskb->dev = llc->dev;
790 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
791 llc->daddr.lsap, LLC_PDU_RSP);
792 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
793 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
794 if (rc)
795 goto free;
796 llc_conn_send_pdu(sk, nskb);
797 }
798 out:
799 return rc;
800 free:
801 kfree_skb(nskb);
802 goto out;
803 }
804
805 void llc_conn_set_p_flag(struct sock *sk, u8 value)
806 {
807 int state_changed = llc_sk(sk)->p_flag && !value;
808
809 llc_sk(sk)->p_flag = value;
810
811 if (state_changed)
812 sk->sk_state_change(sk);
813 }
814
815 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
816 {
817 int rc = -ENOBUFS;
818 struct sk_buff *nskb = llc_alloc_frame();
819 struct llc_sock *llc = llc_sk(sk);
820
821 if (nskb) {
822 struct llc_sap *sap = llc->sap;
823 u8 *dmac = llc->daddr.mac;
824
825 if (llc->dev->flags & IFF_LOOPBACK)
826 dmac = llc->dev->dev_addr;
827 nskb->dev = llc->dev;
828 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
829 llc->daddr.lsap, LLC_PDU_CMD);
830 llc_pdu_init_as_sabme_cmd(nskb, 1);
831 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
832 if (rc)
833 goto free;
834 llc_conn_send_pdu(sk, nskb);
835 llc_conn_set_p_flag(sk, 1);
836 }
837 out:
838 return rc;
839 free:
840 kfree_skb(nskb);
841 goto out;
842 }
843
844 int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
845 {
846 u8 f_bit;
847 int rc = -ENOBUFS;
848 struct sk_buff *nskb = llc_alloc_frame();
849
850 llc_pdu_decode_pf_bit(skb, &f_bit);
851 if (nskb) {
852 struct llc_sock *llc = llc_sk(sk);
853 struct llc_sap *sap = llc->sap;
854
855 nskb->dev = llc->dev;
856 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
857 llc->daddr.lsap, LLC_PDU_RSP);
858 llc_pdu_init_as_ua_rsp(nskb, f_bit);
859 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
860 if (rc)
861 goto free;
862 llc_conn_send_pdu(sk, nskb);
863 }
864 out:
865 return rc;
866 free:
867 kfree_skb(nskb);
868 goto out;
869 }
870
871 int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
872 {
873 llc_sk(sk)->s_flag = 0;
874 return 0;
875 }
876
877 int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
878 {
879 llc_sk(sk)->s_flag = 1;
880 return 0;
881 }
882
883 int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
884 {
885 struct llc_sock *llc = llc_sk(sk);
886
887 llc_conn_set_p_flag(sk, 1);
888 mod_timer(&llc->pf_cycle_timer.timer,
889 jiffies + llc->pf_cycle_timer.expire * HZ);
890 return 0;
891 }
892
893 /**
894 * llc_conn_ac_send_ack_if_needed - check if ack is needed
895 * @sk: current connection structure
896 * @skb: current event
897 *
898 * Checks number of received PDUs which have not been acknowledged, yet,
899 * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
900 * sends an RR response as acknowledgement for them. Returns 0 for
901 * success, 1 otherwise.
902 */
903 int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
904 {
905 u8 pf_bit;
906 struct llc_sock *llc = llc_sk(sk);
907
908 llc_pdu_decode_pf_bit(skb, &pf_bit);
909 llc->ack_pf |= pf_bit & 1;
910 if (!llc->ack_must_be_send) {
911 llc->first_pdu_Ns = llc->vR;
912 llc->ack_must_be_send = 1;
913 llc->ack_pf = pf_bit & 1;
914 }
915 if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) {
916 llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
917 llc->ack_must_be_send = 0;
918 llc->ack_pf = 0;
919 llc_conn_ac_inc_npta_value(sk, skb);
920 }
921 return 0;
922 }
923
924 /**
925 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
926 * @sk: current connection structure
927 * @skb: current event
928 *
929 * This action resets ack_must_be_send flag of given connection, this flag
930 * indicates if there is any PDU which has not been acknowledged yet.
931 * Returns 0 for success, 1 otherwise.
932 */
933 int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
934 {
935 llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
936 return 0;
937 }
938
939 /**
940 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
941 * @sk: current connection structure
942 * @skb: current event
943 *
944 * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
945 * all received PDUs which have not been acknowledged, yet. ack_pf flag is
946 * set to one if one PDU with p-bit set to one is received. Returns 0 for
947 * success, 1 otherwise.
948 */
949 static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
950 struct sk_buff *skb)
951 {
952 int rc;
953 struct llc_sock *llc = llc_sk(sk);
954 struct llc_sap *sap = llc->sap;
955
956 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
957 llc->daddr.lsap, LLC_PDU_RSP);
958 llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
959 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
960 if (!rc) {
961 llc_conn_send_pdu(sk, skb);
962 llc_conn_ac_inc_vs_by_1(sk, skb);
963 }
964 return rc;
965 }
966
967 /**
968 * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
969 * @sk: current connection structure.
970 * @skb: current event.
971 *
972 * This action sends an I-format PDU as acknowledge to received PDUs which
973 * have not been acknowledged, yet, if there is any. By using of this
974 * action number of acknowledgements decreases, this technic is called
975 * piggy backing. Returns 0 for success, 1 otherwise.
976 */
977 int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
978 {
979 struct llc_sock *llc = llc_sk(sk);
980
981 if (llc->ack_must_be_send) {
982 llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
983 llc->ack_must_be_send = 0 ;
984 llc->ack_pf = 0;
985 } else
986 llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
987 return 0;
988 }
989
990 /**
991 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
992 * @sk: current connection structure.
993 * @skb: current event.
994 *
995 * This action sends an RR response with f-bit set to ack_pf flag as
996 * acknowledge to all received PDUs which have not been acknowledged, yet,
997 * if there is any. ack_pf flag indicates if a PDU has been received with
998 * p-bit set to one. Returns 0 for success, 1 otherwise.
999 */
1000 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
1001 struct sk_buff *skb)
1002 {
1003 int rc = -ENOBUFS;
1004 struct sk_buff *nskb = llc_alloc_frame();
1005
1006 if (nskb) {
1007 struct llc_sock *llc = llc_sk(sk);
1008 struct llc_sap *sap = llc->sap;
1009
1010 nskb->dev = llc->dev;
1011 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
1012 llc->daddr.lsap, LLC_PDU_RSP);
1013 llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
1014 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
1015 if (rc)
1016 goto free;
1017 llc_conn_send_pdu(sk, nskb);
1018 }
1019 out:
1020 return rc;
1021 free:
1022 kfree_skb(nskb);
1023 goto out;
1024 }
1025
1026 /**
1027 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
1028 * @sk: current connection structure.
1029 * @skb: current event.
1030 *
1031 * After "inc_cntr" times calling of this action, "npta" increase by one.
1032 * this action tries to make vale of "npta" greater as possible; number of
1033 * acknowledgements decreases by increasing of "npta". Returns 0 for
1034 * success, 1 otherwise.
1035 */
1036 static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
1037 {
1038 struct llc_sock *llc = llc_sk(sk);
1039
1040 if (!llc->inc_cntr) {
1041 llc->dec_step = 0;
1042 llc->dec_cntr = llc->inc_cntr = 2;
1043 ++llc->npta;
1044 if (llc->npta > 127)
1045 llc->npta = 127 ;
1046 } else
1047 --llc->inc_cntr;
1048 return 0;
1049 }
1050
1051 /**
1052 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1053 * @sk: current connection structure.
1054 * @skb: current event.
1055 *
1056 * After receiving "dec_cntr" times RR command, this action decreases
1057 * "npta" by one. Returns 0 for success, 1 otherwise.
1058 */
1059 int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
1060 {
1061 struct llc_sock *llc = llc_sk(sk);
1062
1063 if (!llc->connect_step && !llc->remote_busy_flag) {
1064 if (!llc->dec_step) {
1065 if (!llc->dec_cntr) {
1066 llc->inc_cntr = llc->dec_cntr = 2;
1067 if (llc->npta > 0)
1068 llc->npta = llc->npta - 1;
1069 } else
1070 llc->dec_cntr -=1;
1071 }
1072 } else
1073 llc->connect_step = 0 ;
1074 return 0;
1075 }
1076
1077 /**
1078 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1079 * @sk: current connection structure.
1080 * @skb: current event.
1081 *
1082 * After receiving "dec_cntr" times RNR command, this action decreases
1083 * "npta" by one. Returns 0 for success, 1 otherwise.
1084 */
1085 int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
1086 {
1087 struct llc_sock *llc = llc_sk(sk);
1088
1089 if (llc->remote_busy_flag)
1090 if (!llc->dec_step) {
1091 if (!llc->dec_cntr) {
1092 llc->inc_cntr = llc->dec_cntr = 2;
1093 if (llc->npta > 0)
1094 --llc->npta;
1095 } else
1096 --llc->dec_cntr;
1097 }
1098 return 0;
1099 }
1100
1101 /**
1102 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1103 * @sk: current connection structure.
1104 * @skb: current event.
1105 *
1106 * After receiving of a REJ command or response, transmit window size is
1107 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1108 * success, 1 otherwise.
1109 */
1110 int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
1111 {
1112 struct llc_sock *llc = llc_sk(sk);
1113 u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
1114
1115 llc->k -= unacked_pdu;
1116 if (llc->k < 2)
1117 llc->k = 2;
1118 return 0;
1119 }
1120
1121 /**
1122 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1123 * @sk: current connection structure.
1124 * @skb: current event.
1125 *
1126 * After receiving an RR response with f-bit set to one, transmit window
1127 * size is increased by one. Returns 0 for success, 1 otherwise.
1128 */
1129 int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
1130 {
1131 struct llc_sock *llc = llc_sk(sk);
1132
1133 llc->k += 1;
1134 if (llc->k > 128)
1135 llc->k = 128 ;
1136 return 0;
1137 }
1138
1139 int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
1140 {
1141 struct llc_sock *llc = llc_sk(sk);
1142
1143 del_timer(&llc->pf_cycle_timer.timer);
1144 del_timer(&llc->ack_timer.timer);
1145 del_timer(&llc->rej_sent_timer.timer);
1146 del_timer(&llc->busy_state_timer.timer);
1147 llc->ack_must_be_send = 0;
1148 llc->ack_pf = 0;
1149 return 0;
1150 }
1151
1152 int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
1153 {
1154 struct llc_sock *llc = llc_sk(sk);
1155
1156 del_timer(&llc->rej_sent_timer.timer);
1157 del_timer(&llc->pf_cycle_timer.timer);
1158 del_timer(&llc->busy_state_timer.timer);
1159 llc->ack_must_be_send = 0;
1160 llc->ack_pf = 0;
1161 return 0;
1162 }
1163
1164 int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
1165 {
1166 struct llc_sock *llc = llc_sk(sk);
1167
1168 mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ);
1169 return 0;
1170 }
1171
1172 int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
1173 {
1174 struct llc_sock *llc = llc_sk(sk);
1175
1176 mod_timer(&llc->rej_sent_timer.timer,
1177 jiffies + llc->rej_sent_timer.expire * HZ);
1178 return 0;
1179 }
1180
1181 int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
1182 struct sk_buff *skb)
1183 {
1184 struct llc_sock *llc = llc_sk(sk);
1185
1186 if (!timer_pending(&llc->ack_timer.timer))
1187 mod_timer(&llc->ack_timer.timer,
1188 jiffies + llc->ack_timer.expire * HZ);
1189 return 0;
1190 }
1191
1192 int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
1193 {
1194 del_timer(&llc_sk(sk)->ack_timer.timer);
1195 return 0;
1196 }
1197
1198 int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
1199 {
1200 struct llc_sock *llc = llc_sk(sk);
1201
1202 del_timer(&llc->pf_cycle_timer.timer);
1203 llc_conn_set_p_flag(sk, 0);
1204 return 0;
1205 }
1206
1207 int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
1208 {
1209 del_timer(&llc_sk(sk)->rej_sent_timer.timer);
1210 return 0;
1211 }
1212
1213 int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
1214 {
1215 int acked;
1216 u16 unacked = 0;
1217 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1218 struct llc_sock *llc = llc_sk(sk);
1219
1220 llc->last_nr = PDU_SUPV_GET_Nr(pdu);
1221 acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
1222 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1223 if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
1224 llc->retry_count = 0;
1225 del_timer(&llc->ack_timer.timer);
1226 if (llc->failed_data_req) {
1227 /* already, we did not accept data from upper layer
1228 * (tx_window full or unacceptable state). Now, we
1229 * can send data and must inform to upper layer.
1230 */
1231 llc->failed_data_req = 0;
1232 llc_conn_ac_data_confirm(sk, skb);
1233 }
1234 if (unacked)
1235 mod_timer(&llc->ack_timer.timer,
1236 jiffies + llc->ack_timer.expire * HZ);
1237 } else if (llc->failed_data_req) {
1238 u8 f_bit;
1239
1240 llc_pdu_decode_pf_bit(skb, &f_bit);
1241 if (f_bit == 1) {
1242 llc->failed_data_req = 0;
1243 llc_conn_ac_data_confirm(sk, skb);
1244 }
1245 }
1246 return 0;
1247 }
1248
1249 int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
1250 {
1251 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1252
1253 if (LLC_PDU_IS_RSP(pdu)) {
1254 u8 f_bit;
1255
1256 llc_pdu_decode_pf_bit(skb, &f_bit);
1257 if (f_bit) {
1258 llc_conn_set_p_flag(sk, 0);
1259 llc_conn_ac_stop_p_timer(sk, skb);
1260 }
1261 }
1262 return 0;
1263 }
1264
1265 int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
1266 {
1267 llc_sk(sk)->data_flag = 2;
1268 return 0;
1269 }
1270
1271 int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
1272 {
1273 llc_sk(sk)->data_flag = 0;
1274 return 0;
1275 }
1276
1277 int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
1278 {
1279 llc_sk(sk)->data_flag = 1;
1280 return 0;
1281 }
1282
1283 int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
1284 struct sk_buff *skb)
1285 {
1286 if (!llc_sk(sk)->data_flag)
1287 llc_sk(sk)->data_flag = 1;
1288 return 0;
1289 }
1290
1291 int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
1292 {
1293 llc_conn_set_p_flag(sk, 0);
1294 return 0;
1295 }
1296
1297 static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
1298 {
1299 llc_conn_set_p_flag(sk, 1);
1300 return 0;
1301 }
1302
1303 int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
1304 {
1305 llc_sk(sk)->remote_busy_flag = 0;
1306 return 0;
1307 }
1308
1309 int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
1310 {
1311 llc_sk(sk)->cause_flag = 0;
1312 return 0;
1313 }
1314
1315 int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
1316 {
1317 llc_sk(sk)->cause_flag = 1;
1318 return 0;
1319 }
1320
1321 int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
1322 {
1323 llc_sk(sk)->retry_count = 0;
1324 return 0;
1325 }
1326
1327 int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
1328 {
1329 llc_sk(sk)->retry_count++;
1330 return 0;
1331 }
1332
1333 int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
1334 {
1335 llc_sk(sk)->vR = 0;
1336 return 0;
1337 }
1338
1339 int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
1340 {
1341 llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
1342 return 0;
1343 }
1344
1345 int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
1346 {
1347 llc_sk(sk)->vS = 0;
1348 return 0;
1349 }
1350
1351 int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
1352 {
1353 llc_sk(sk)->vS = llc_sk(sk)->last_nr;
1354 return 0;
1355 }
1356
1357 int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
1358 {
1359 llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128;
1360 return 0;
1361 }
1362
1363 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
1364 {
1365 struct sock *sk = (struct sock *)timeout_data;
1366 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1367
1368 bh_lock_sock(sk);
1369 if (skb) {
1370 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1371
1372 skb->sk = sk;
1373 ev->type = LLC_CONN_EV_TYPE_P_TMR;
1374 llc_process_tmr_ev(sk, skb);
1375 }
1376 bh_unlock_sock(sk);
1377 }
1378
1379 void llc_conn_busy_tmr_cb(unsigned long timeout_data)
1380 {
1381 struct sock *sk = (struct sock *)timeout_data;
1382 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1383
1384 bh_lock_sock(sk);
1385 if (skb) {
1386 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1387
1388 skb->sk = sk;
1389 ev->type = LLC_CONN_EV_TYPE_BUSY_TMR;
1390 llc_process_tmr_ev(sk, skb);
1391 }
1392 bh_unlock_sock(sk);
1393 }
1394
1395 void llc_conn_ack_tmr_cb(unsigned long timeout_data)
1396 {
1397 struct sock* sk = (struct sock *)timeout_data;
1398 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1399
1400 bh_lock_sock(sk);
1401 if (skb) {
1402 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1403
1404 skb->sk = sk;
1405 ev->type = LLC_CONN_EV_TYPE_ACK_TMR;
1406 llc_process_tmr_ev(sk, skb);
1407 }
1408 bh_unlock_sock(sk);
1409 }
1410
1411 void llc_conn_rej_tmr_cb(unsigned long timeout_data)
1412 {
1413 struct sock *sk = (struct sock *)timeout_data;
1414 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1415
1416 bh_lock_sock(sk);
1417 if (skb) {
1418 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1419
1420 skb->sk = sk;
1421 ev->type = LLC_CONN_EV_TYPE_REJ_TMR;
1422 llc_process_tmr_ev(sk, skb);
1423 }
1424 bh_unlock_sock(sk);
1425 }
1426
1427 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
1428 {
1429 llc_sk(sk)->X = llc_sk(sk)->vS;
1430 llc_conn_ac_set_vs_nr(sk, skb);
1431 return 0;
1432 }
1433
1434 int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
1435 {
1436 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1437 u8 nr = PDU_SUPV_GET_Nr(pdu);
1438
1439 if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
1440 llc_conn_ac_set_vs_nr(sk, skb);
1441 return 0;
1442 }
1443
1444 /*
1445 * Non-standard actions; these not contained in IEEE specification; for
1446 * our own usage
1447 */
1448 /**
1449 * llc_conn_disc - removes connection from SAP list and frees it
1450 * @sk: closed connection
1451 * @skb: occurred event
1452 */
1453 int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
1454 {
1455 /* FIXME: this thing seems to want to die */
1456 return 0;
1457 }
1458
1459 /**
1460 * llc_conn_reset - resets connection
1461 * @sk : reseting connection.
1462 * @skb: occurred event.
1463 *
1464 * Stop all timers, empty all queues and reset all flags.
1465 */
1466 int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
1467 {
1468 llc_sk_reset(sk);
1469 return 0;
1470 }
1471
1472 /**
1473 * llc_circular_between - designates that b is between a and c or not
1474 * @a: lower bound
1475 * @b: element to see if is between a and b
1476 * @c: upper bound
1477 *
1478 * This function designates that b is between a and c or not (for example,
1479 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1480 * otherwise.
1481 */
1482 u8 llc_circular_between(u8 a, u8 b, u8 c)
1483 {
1484 b = b - a;
1485 c = c - a;
1486 return b <= c;
1487 }
1488
1489 /**
1490 * llc_process_tmr_ev - timer backend
1491 * @sk: active connection
1492 * @skb: occurred event
1493 *
1494 * This function is called from timer callback functions. When connection
1495 * is busy (during sending a data frame) timer expiration event must be
1496 * queued. Otherwise this event can be sent to connection state machine.
1497 * Queued events will process by llc_backlog_rcv function after sending
1498 * data frame.
1499 */
1500 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
1501 {
1502 if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
1503 printk(KERN_WARNING "%s: timer called on closed connection\n",
1504 __FUNCTION__);
1505 kfree_skb(skb);
1506 } else {
1507 if (!sock_owned_by_user(sk))
1508 llc_conn_state_process(sk, skb);
1509 else {
1510 llc_set_backlog_type(skb, LLC_EVENT);
1511 sk_add_backlog(sk, skb);
1512 }
1513 }
1514 }
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