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rcu: Better explain the condition parameter of rcu_dereference_check()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / llc / llc_c_ac.c
blobea225bd2672c03947dcc01b581a14e1a2b792e68
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 <linux/slab.h>
22 #include <net/llc_conn.h>
23 #include <net/llc_sap.h>
24 #include <net/sock.h>
25 #include <net/llc_c_ev.h>
26 #include <net/llc_c_ac.h>
27 #include <net/llc_c_st.h>
28 #include <net/llc_pdu.h>
29 #include <net/llc.h>
30
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 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
64
65 ev->ind_prim = LLC_CONN_PRIM;
66 return 0;
67 }
68
69 int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
70 {
71 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
72
73 ev->cfm_prim = LLC_CONN_PRIM;
74 return 0;
75 }
76
77 static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb)
78 {
79 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
80
81 ev->cfm_prim = LLC_DATA_PRIM;
82 return 0;
83 }
84
85 int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb)
86 {
87 llc_conn_rtn_pdu(sk, skb);
88 return 0;
89 }
90
91 int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
92 {
93 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
94 u8 reason = 0;
95 int rc = 0;
96
97 if (ev->type == LLC_CONN_EV_TYPE_PDU) {
98 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
99
100 if (LLC_PDU_IS_RSP(pdu) &&
101 LLC_PDU_TYPE_IS_U(pdu) &&
102 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM)
103 reason = LLC_DISC_REASON_RX_DM_RSP_PDU;
104 else if (LLC_PDU_IS_CMD(pdu) &&
105 LLC_PDU_TYPE_IS_U(pdu) &&
106 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC)
107 reason = LLC_DISC_REASON_RX_DISC_CMD_PDU;
108 } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR)
109 reason = LLC_DISC_REASON_ACK_TMR_EXP;
110 else
111 rc = -EINVAL;
112 if (!rc) {
113 ev->reason = reason;
114 ev->ind_prim = LLC_DISC_PRIM;
115 }
116 return rc;
117 }
118
119 int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
120 {
121 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
122
123 ev->reason = ev->status;
124 ev->cfm_prim = LLC_DISC_PRIM;
125 return 0;
126 }
127
128 int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
129 {
130 u8 reason = 0;
131 int rc = 1;
132 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
133 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
134 struct llc_sock *llc = llc_sk(sk);
135
136 switch (ev->type) {
137 case LLC_CONN_EV_TYPE_PDU:
138 if (LLC_PDU_IS_RSP(pdu) &&
139 LLC_PDU_TYPE_IS_U(pdu) &&
140 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) {
141 reason = LLC_RESET_REASON_LOCAL;
142 rc = 0;
143 } else if (LLC_PDU_IS_CMD(pdu) &&
144 LLC_PDU_TYPE_IS_U(pdu) &&
145 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
146 reason = LLC_RESET_REASON_REMOTE;
147 rc = 0;
148 }
149 break;
150 case LLC_CONN_EV_TYPE_ACK_TMR:
151 case LLC_CONN_EV_TYPE_P_TMR:
152 case LLC_CONN_EV_TYPE_REJ_TMR:
153 case LLC_CONN_EV_TYPE_BUSY_TMR:
154 if (llc->retry_count > llc->n2) {
155 reason = LLC_RESET_REASON_LOCAL;
156 rc = 0;
157 }
158 break;
159 }
160 if (!rc) {
161 ev->reason = reason;
162 ev->ind_prim = LLC_RESET_PRIM;
163 }
164 return rc;
165 }
166
167 int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
168 {
169 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
170
171 ev->reason = 0;
172 ev->cfm_prim = LLC_RESET_PRIM;
173 return 0;
174 }
175
176 int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk,
177 struct sk_buff *skb)
178 {
179 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
180
181 if (LLC_PDU_IS_RSP(pdu) &&
182 LLC_PDU_TYPE_IS_I(pdu) &&
183 LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf)
184 llc_conn_ac_clear_remote_busy(sk, skb);
185 return 0;
186 }
187
188 int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
189 struct sk_buff *skb)
190 {
191 struct llc_sock *llc = llc_sk(sk);
192
193 if (llc->data_flag == 2)
194 del_timer(&llc->rej_sent_timer.timer);
195 return 0;
196 }
197
198 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
199 {
200 int rc = -ENOBUFS;
201 struct llc_sock *llc = llc_sk(sk);
202 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
203
204 if (nskb) {
205 struct llc_sap *sap = llc->sap;
206
207 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
208 llc->daddr.lsap, LLC_PDU_CMD);
209 llc_pdu_init_as_disc_cmd(nskb, 1);
210 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
211 if (unlikely(rc))
212 goto free;
213 llc_conn_send_pdu(sk, nskb);
214 llc_conn_ac_set_p_flag_1(sk, skb);
215 }
216 out:
217 return rc;
218 free:
219 kfree_skb(nskb);
220 goto out;
221 }
222
223 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
224 {
225 int rc = -ENOBUFS;
226 struct llc_sock *llc = llc_sk(sk);
227 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
228
229 if (nskb) {
230 struct llc_sap *sap = llc->sap;
231 u8 f_bit;
232
233 llc_pdu_decode_pf_bit(skb, &f_bit);
234 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
235 llc->daddr.lsap, LLC_PDU_RSP);
236 llc_pdu_init_as_dm_rsp(nskb, f_bit);
237 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
238 if (unlikely(rc))
239 goto free;
240 llc_conn_send_pdu(sk, nskb);
241 }
242 out:
243 return rc;
244 free:
245 kfree_skb(nskb);
246 goto out;
247 }
248
249 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
250 {
251 int rc = -ENOBUFS;
252 struct llc_sock *llc = llc_sk(sk);
253 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
254
255 if (nskb) {
256 struct llc_sap *sap = llc->sap;
257
258 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
259 llc->daddr.lsap, LLC_PDU_RSP);
260 llc_pdu_init_as_dm_rsp(nskb, 1);
261 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
262 if (unlikely(rc))
263 goto free;
264 llc_conn_send_pdu(sk, nskb);
265 }
266 out:
267 return rc;
268 free:
269 kfree_skb(nskb);
270 goto out;
271 }
272
273 int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
274 {
275 u8 f_bit;
276 int rc = -ENOBUFS;
277 struct sk_buff *nskb;
278 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
279 struct llc_sock *llc = llc_sk(sk);
280
281 llc->rx_pdu_hdr = *((u32 *)pdu);
282 if (LLC_PDU_IS_CMD(pdu))
283 llc_pdu_decode_pf_bit(skb, &f_bit);
284 else
285 f_bit = 0;
286 nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
287 sizeof(struct llc_frmr_info));
288 if (nskb) {
289 struct llc_sap *sap = llc->sap;
290
291 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
292 llc->daddr.lsap, LLC_PDU_RSP);
293 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
294 llc->vR, INCORRECT);
295 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
296 if (unlikely(rc))
297 goto free;
298 llc_conn_send_pdu(sk, nskb);
299 }
300 out:
301 return rc;
302 free:
303 kfree_skb(nskb);
304 goto out;
305 }
306
307 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
308 {
309 int rc = -ENOBUFS;
310 struct llc_sock *llc = llc_sk(sk);
311 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
312 sizeof(struct llc_frmr_info));
313
314 if (nskb) {
315 struct llc_sap *sap = llc->sap;
316 struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
317
318 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
319 llc->daddr.lsap, LLC_PDU_RSP);
320 llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS,
321 llc->vR, INCORRECT);
322 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
323 if (unlikely(rc))
324 goto free;
325 llc_conn_send_pdu(sk, nskb);
326 }
327 out:
328 return rc;
329 free:
330 kfree_skb(nskb);
331 goto out;
332 }
333
334 int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
335 {
336 u8 f_bit;
337 int rc = -ENOBUFS;
338 struct sk_buff *nskb;
339 struct llc_sock *llc = llc_sk(sk);
340
341 llc_pdu_decode_pf_bit(skb, &f_bit);
342 nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
343 sizeof(struct llc_frmr_info));
344 if (nskb) {
345 struct llc_sap *sap = llc->sap;
346 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
347
348 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
349 llc->daddr.lsap, LLC_PDU_RSP);
350 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
351 llc->vR, INCORRECT);
352 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
353 if (unlikely(rc))
354 goto free;
355 llc_conn_send_pdu(sk, nskb);
356 }
357 out:
358 return rc;
359 free:
360 kfree_skb(nskb);
361 goto out;
362 }
363
364 int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
365 {
366 int rc;
367 struct llc_sock *llc = llc_sk(sk);
368 struct llc_sap *sap = llc->sap;
369
370 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
371 llc->daddr.lsap, LLC_PDU_CMD);
372 llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
373 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
374 if (likely(!rc)) {
375 llc_conn_send_pdu(sk, skb);
376 llc_conn_ac_inc_vs_by_1(sk, skb);
377 }
378 return rc;
379 }
380
381 static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
382 {
383 int rc;
384 struct llc_sock *llc = llc_sk(sk);
385 struct llc_sap *sap = llc->sap;
386
387 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
388 llc->daddr.lsap, LLC_PDU_CMD);
389 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
390 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
391 if (likely(!rc)) {
392 llc_conn_send_pdu(sk, skb);
393 llc_conn_ac_inc_vs_by_1(sk, skb);
394 }
395 return rc;
396 }
397
398 int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
399 {
400 int rc;
401 struct llc_sock *llc = llc_sk(sk);
402 struct llc_sap *sap = llc->sap;
403
404 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
405 llc->daddr.lsap, LLC_PDU_CMD);
406 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
407 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
408 if (likely(!rc)) {
409 llc_conn_send_pdu(sk, skb);
410 llc_conn_ac_inc_vs_by_1(sk, skb);
411 }
412 return 0;
413 }
414
415 int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
416 {
417 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
418 u8 nr = LLC_I_GET_NR(pdu);
419
420 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
421 return 0;
422 }
423
424 int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
425 struct sk_buff *skb)
426 {
427 u8 nr;
428 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
429 int rc = -ENOBUFS;
430 struct llc_sock *llc = llc_sk(sk);
431 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
432
433 if (nskb) {
434 struct llc_sap *sap = llc->sap;
435
436 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
437 llc->daddr.lsap, LLC_PDU_RSP);
438 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
439 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
440 if (likely(!rc))
441 llc_conn_send_pdu(sk, nskb);
442 else
443 kfree_skb(skb);
444 }
445 if (rc) {
446 nr = LLC_I_GET_NR(pdu);
447 rc = 0;
448 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
449 }
450 return rc;
451 }
452
453 int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
454 {
455 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
456 u8 nr = LLC_I_GET_NR(pdu);
457
458 llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
459 return 0;
460 }
461
462 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
463 {
464 int rc = -ENOBUFS;
465 struct llc_sock *llc = llc_sk(sk);
466 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
467
468 if (nskb) {
469 struct llc_sap *sap = llc->sap;
470
471 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
472 llc->daddr.lsap, LLC_PDU_CMD);
473 llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
474 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
475 if (unlikely(rc))
476 goto free;
477 llc_conn_send_pdu(sk, nskb);
478 }
479 out:
480 return rc;
481 free:
482 kfree_skb(nskb);
483 goto out;
484 }
485
486 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
487 {
488 int rc = -ENOBUFS;
489 struct llc_sock *llc = llc_sk(sk);
490 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
491
492 if (nskb) {
493 struct llc_sap *sap = llc->sap;
494
495 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
496 llc->daddr.lsap, LLC_PDU_RSP);
497 llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR);
498 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
499 if (unlikely(rc))
500 goto free;
501 llc_conn_send_pdu(sk, nskb);
502 }
503 out:
504 return rc;
505 free:
506 kfree_skb(nskb);
507 goto out;
508 }
509
510 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
511 {
512 int rc = -ENOBUFS;
513 struct llc_sock *llc = llc_sk(sk);
514 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
515
516 if (nskb) {
517 struct llc_sap *sap = llc->sap;
518
519 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
520 llc->daddr.lsap, LLC_PDU_RSP);
521 llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR);
522 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
523 if (unlikely(rc))
524 goto free;
525 llc_conn_send_pdu(sk, nskb);
526 }
527 out:
528 return rc;
529 free:
530 kfree_skb(nskb);
531 goto out;
532 }
533
534 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
535 {
536 int rc = -ENOBUFS;
537 struct llc_sock *llc = llc_sk(sk);
538 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
539
540 if (nskb) {
541 struct llc_sap *sap = llc->sap;
542
543 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
544 llc->daddr.lsap, LLC_PDU_CMD);
545 llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
546 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
547 if (unlikely(rc))
548 goto free;
549 llc_conn_send_pdu(sk, nskb);
550 }
551 out:
552 return rc;
553 free:
554 kfree_skb(nskb);
555 goto out;
556 }
557
558 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
559 {
560 int rc = -ENOBUFS;
561 struct llc_sock *llc = llc_sk(sk);
562 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
563
564 if (nskb) {
565 struct llc_sap *sap = llc->sap;
566
567 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
568 llc->daddr.lsap, LLC_PDU_RSP);
569 llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR);
570 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
571 if (unlikely(rc))
572 goto free;
573 llc_conn_send_pdu(sk, nskb);
574 }
575 out:
576 return rc;
577 free:
578 kfree_skb(nskb);
579 goto out;
580 }
581
582 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
583 {
584 int rc = -ENOBUFS;
585 struct llc_sock *llc = llc_sk(sk);
586 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
587
588 if (nskb) {
589 struct llc_sap *sap = llc->sap;
590
591 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
592 llc->daddr.lsap, LLC_PDU_RSP);
593 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
594 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
595 if (unlikely(rc))
596 goto free;
597 llc_conn_send_pdu(sk, nskb);
598 }
599 out:
600 return rc;
601 free:
602 kfree_skb(nskb);
603 goto out;
604 }
605
606 int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
607 {
608 struct llc_sock *llc = llc_sk(sk);
609
610 if (!llc->remote_busy_flag) {
611 llc->remote_busy_flag = 1;
612 mod_timer(&llc->busy_state_timer.timer,
613 jiffies + llc->busy_state_timer.expire);
614 }
615 return 0;
616 }
617
618 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
619 {
620 int rc = -ENOBUFS;
621 struct llc_sock *llc = llc_sk(sk);
622 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
623
624 if (nskb) {
625 struct llc_sap *sap = llc->sap;
626
627 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
628 llc->daddr.lsap, LLC_PDU_RSP);
629 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
630 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
631 if (unlikely(rc))
632 goto free;
633 llc_conn_send_pdu(sk, nskb);
634 }
635 out:
636 return rc;
637 free:
638 kfree_skb(nskb);
639 goto out;
640 }
641
642 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
643 {
644 int rc = -ENOBUFS;
645 struct llc_sock *llc = llc_sk(sk);
646 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
647
648 if (nskb) {
649 struct llc_sap *sap = llc->sap;
650
651 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
652 llc->daddr.lsap, LLC_PDU_CMD);
653 llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
654 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
655 if (unlikely(rc))
656 goto free;
657 llc_conn_send_pdu(sk, nskb);
658 }
659 out:
660 return rc;
661 free:
662 kfree_skb(nskb);
663 goto out;
664 }
665
666 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
667 {
668 int rc = -ENOBUFS;
669 struct llc_sock *llc = llc_sk(sk);
670 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
671
672 if (nskb) {
673 struct llc_sap *sap = llc->sap;
674 u8 f_bit = 1;
675
676 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
677 llc->daddr.lsap, LLC_PDU_RSP);
678 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
679 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
680 if (unlikely(rc))
681 goto free;
682 llc_conn_send_pdu(sk, nskb);
683 }
684 out:
685 return rc;
686 free:
687 kfree_skb(nskb);
688 goto out;
689 }
690
691 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
692 {
693 int rc = -ENOBUFS;
694 struct llc_sock *llc = llc_sk(sk);
695 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
696
697 if (nskb) {
698 struct llc_sap *sap = llc->sap;
699
700 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
701 llc->daddr.lsap, LLC_PDU_RSP);
702 llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR);
703 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
704 if (unlikely(rc))
705 goto free;
706 llc_conn_send_pdu(sk, nskb);
707 }
708 out:
709 return rc;
710 free:
711 kfree_skb(nskb);
712 goto out;
713 }
714
715 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
716 {
717 int rc = -ENOBUFS;
718 struct llc_sock *llc = llc_sk(sk);
719 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
720
721 if (nskb) {
722 struct llc_sap *sap = llc->sap;
723
724 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
725 llc->daddr.lsap, LLC_PDU_RSP);
726 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
727 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
728 if (unlikely(rc))
729 goto free;
730 llc_conn_send_pdu(sk, nskb);
731 }
732 out:
733 return rc;
734 free:
735 kfree_skb(nskb);
736 goto out;
737 }
738
739 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
740 {
741 int rc = -ENOBUFS;
742 struct llc_sock *llc = llc_sk(sk);
743 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
744
745 if (nskb) {
746 struct llc_sap *sap = llc->sap;
747
748 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
749 llc->daddr.lsap, LLC_PDU_RSP);
750 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
751 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
752 if (unlikely(rc))
753 goto free;
754 llc_conn_send_pdu(sk, nskb);
755 }
756 out:
757 return rc;
758 free:
759 kfree_skb(nskb);
760 goto out;
761 }
762
763 void llc_conn_set_p_flag(struct sock *sk, u8 value)
764 {
765 int state_changed = llc_sk(sk)->p_flag && !value;
766
767 llc_sk(sk)->p_flag = value;
768
769 if (state_changed)
770 sk->sk_state_change(sk);
771 }
772
773 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
774 {
775 int rc = -ENOBUFS;
776 struct llc_sock *llc = llc_sk(sk);
777 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
778
779 if (nskb) {
780 struct llc_sap *sap = llc->sap;
781 u8 *dmac = llc->daddr.mac;
782
783 if (llc->dev->flags & IFF_LOOPBACK)
784 dmac = llc->dev->dev_addr;
785 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
786 llc->daddr.lsap, LLC_PDU_CMD);
787 llc_pdu_init_as_sabme_cmd(nskb, 1);
788 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
789 if (unlikely(rc))
790 goto free;
791 llc_conn_send_pdu(sk, nskb);
792 llc_conn_set_p_flag(sk, 1);
793 }
794 out:
795 return rc;
796 free:
797 kfree_skb(nskb);
798 goto out;
799 }
800
801 int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
802 {
803 u8 f_bit;
804 int rc = -ENOBUFS;
805 struct llc_sock *llc = llc_sk(sk);
806 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
807
808 llc_pdu_decode_pf_bit(skb, &f_bit);
809 if (nskb) {
810 struct llc_sap *sap = llc->sap;
811
812 nskb->dev = llc->dev;
813 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
814 llc->daddr.lsap, LLC_PDU_RSP);
815 llc_pdu_init_as_ua_rsp(nskb, f_bit);
816 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
817 if (unlikely(rc))
818 goto free;
819 llc_conn_send_pdu(sk, nskb);
820 }
821 out:
822 return rc;
823 free:
824 kfree_skb(nskb);
825 goto out;
826 }
827
828 int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
829 {
830 llc_sk(sk)->s_flag = 0;
831 return 0;
832 }
833
834 int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
835 {
836 llc_sk(sk)->s_flag = 1;
837 return 0;
838 }
839
840 int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
841 {
842 struct llc_sock *llc = llc_sk(sk);
843
844 llc_conn_set_p_flag(sk, 1);
845 mod_timer(&llc->pf_cycle_timer.timer,
846 jiffies + llc->pf_cycle_timer.expire);
847 return 0;
848 }
849
850 /**
851 * llc_conn_ac_send_ack_if_needed - check if ack is needed
852 * @sk: current connection structure
853 * @skb: current event
854 *
855 * Checks number of received PDUs which have not been acknowledged, yet,
856 * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
857 * sends an RR response as acknowledgement for them. Returns 0 for
858 * success, 1 otherwise.
859 */
860 int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
861 {
862 u8 pf_bit;
863 struct llc_sock *llc = llc_sk(sk);
864
865 llc_pdu_decode_pf_bit(skb, &pf_bit);
866 llc->ack_pf |= pf_bit & 1;
867 if (!llc->ack_must_be_send) {
868 llc->first_pdu_Ns = llc->vR;
869 llc->ack_must_be_send = 1;
870 llc->ack_pf = pf_bit & 1;
871 }
872 if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO)
873 % LLC_2_SEQ_NBR_MODULO) >= llc->npta) {
874 llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
875 llc->ack_must_be_send = 0;
876 llc->ack_pf = 0;
877 llc_conn_ac_inc_npta_value(sk, skb);
878 }
879 return 0;
880 }
881
882 /**
883 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
884 * @sk: current connection structure
885 * @skb: current event
886 *
887 * This action resets ack_must_be_send flag of given connection, this flag
888 * indicates if there is any PDU which has not been acknowledged yet.
889 * Returns 0 for success, 1 otherwise.
890 */
891 int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
892 {
893 llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
894 return 0;
895 }
896
897 /**
898 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
899 * @sk: current connection structure
900 * @skb: current event
901 *
902 * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
903 * all received PDUs which have not been acknowledged, yet. ack_pf flag is
904 * set to one if one PDU with p-bit set to one is received. Returns 0 for
905 * success, 1 otherwise.
906 */
907 static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
908 struct sk_buff *skb)
909 {
910 int rc;
911 struct llc_sock *llc = llc_sk(sk);
912 struct llc_sap *sap = llc->sap;
913
914 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
915 llc->daddr.lsap, LLC_PDU_RSP);
916 llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
917 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
918 if (likely(!rc)) {
919 llc_conn_send_pdu(sk, skb);
920 llc_conn_ac_inc_vs_by_1(sk, skb);
921 }
922 return rc;
923 }
924
925 /**
926 * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
927 * @sk: current connection structure.
928 * @skb: current event.
929 *
930 * This action sends an I-format PDU as acknowledge to received PDUs which
931 * have not been acknowledged, yet, if there is any. By using of this
932 * action number of acknowledgements decreases, this technic is called
933 * piggy backing. Returns 0 for success, 1 otherwise.
934 */
935 int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
936 {
937 struct llc_sock *llc = llc_sk(sk);
938
939 if (llc->ack_must_be_send) {
940 llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
941 llc->ack_must_be_send = 0 ;
942 llc->ack_pf = 0;
943 } else
944 llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
945 return 0;
946 }
947
948 /**
949 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
950 * @sk: current connection structure.
951 * @skb: current event.
952 *
953 * This action sends an RR response with f-bit set to ack_pf flag as
954 * acknowledge to all received PDUs which have not been acknowledged, yet,
955 * if there is any. ack_pf flag indicates if a PDU has been received with
956 * p-bit set to one. Returns 0 for success, 1 otherwise.
957 */
958 static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
959 struct sk_buff *skb)
960 {
961 int rc = -ENOBUFS;
962 struct llc_sock *llc = llc_sk(sk);
963 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
964
965 if (nskb) {
966 struct llc_sap *sap = llc->sap;
967
968 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
969 llc->daddr.lsap, LLC_PDU_RSP);
970 llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
971 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
972 if (unlikely(rc))
973 goto free;
974 llc_conn_send_pdu(sk, nskb);
975 }
976 out:
977 return rc;
978 free:
979 kfree_skb(nskb);
980 goto out;
981 }
982
983 /**
984 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
985 * @sk: current connection structure.
986 * @skb: current event.
987 *
988 * After "inc_cntr" times calling of this action, "npta" increase by one.
989 * this action tries to make vale of "npta" greater as possible; number of
990 * acknowledgements decreases by increasing of "npta". Returns 0 for
991 * success, 1 otherwise.
992 */
993 static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
994 {
995 struct llc_sock *llc = llc_sk(sk);
996
997 if (!llc->inc_cntr) {
998 llc->dec_step = 0;
999 llc->dec_cntr = llc->inc_cntr = 2;
1000 ++llc->npta;
1001 if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO)
1002 llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO;
1003 } else
1004 --llc->inc_cntr;
1005 return 0;
1006 }
1007
1008 /**
1009 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1010 * @sk: current connection structure.
1011 * @skb: current event.
1012 *
1013 * After receiving "dec_cntr" times RR command, this action decreases
1014 * "npta" by one. Returns 0 for success, 1 otherwise.
1015 */
1016 int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
1017 {
1018 struct llc_sock *llc = llc_sk(sk);
1019
1020 if (!llc->connect_step && !llc->remote_busy_flag) {
1021 if (!llc->dec_step) {
1022 if (!llc->dec_cntr) {
1023 llc->inc_cntr = llc->dec_cntr = 2;
1024 if (llc->npta > 0)
1025 llc->npta = llc->npta - 1;
1026 } else
1027 llc->dec_cntr -=1;
1028 }
1029 } else
1030 llc->connect_step = 0 ;
1031 return 0;
1032 }
1033
1034 /**
1035 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1036 * @sk: current connection structure.
1037 * @skb: current event.
1038 *
1039 * After receiving "dec_cntr" times RNR command, this action decreases
1040 * "npta" by one. Returns 0 for success, 1 otherwise.
1041 */
1042 int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
1043 {
1044 struct llc_sock *llc = llc_sk(sk);
1045
1046 if (llc->remote_busy_flag)
1047 if (!llc->dec_step) {
1048 if (!llc->dec_cntr) {
1049 llc->inc_cntr = llc->dec_cntr = 2;
1050 if (llc->npta > 0)
1051 --llc->npta;
1052 } else
1053 --llc->dec_cntr;
1054 }
1055 return 0;
1056 }
1057
1058 /**
1059 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1060 * @sk: current connection structure.
1061 * @skb: current event.
1062 *
1063 * After receiving of a REJ command or response, transmit window size is
1064 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1065 * success, 1 otherwise.
1066 */
1067 int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
1068 {
1069 struct llc_sock *llc = llc_sk(sk);
1070 u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
1071
1072 if (llc->k - unacked_pdu < 1)
1073 llc->k = 1;
1074 else
1075 llc->k -= unacked_pdu;
1076 return 0;
1077 }
1078
1079 /**
1080 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1081 * @sk: current connection structure.
1082 * @skb: current event.
1083 *
1084 * After receiving an RR response with f-bit set to one, transmit window
1085 * size is increased by one. Returns 0 for success, 1 otherwise.
1086 */
1087 int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
1088 {
1089 struct llc_sock *llc = llc_sk(sk);
1090
1091 llc->k += 1;
1092 if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO)
1093 llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO;
1094 return 0;
1095 }
1096
1097 int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
1098 {
1099 struct llc_sock *llc = llc_sk(sk);
1100
1101 del_timer(&llc->pf_cycle_timer.timer);
1102 del_timer(&llc->ack_timer.timer);
1103 del_timer(&llc->rej_sent_timer.timer);
1104 del_timer(&llc->busy_state_timer.timer);
1105 llc->ack_must_be_send = 0;
1106 llc->ack_pf = 0;
1107 return 0;
1108 }
1109
1110 int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
1111 {
1112 struct llc_sock *llc = llc_sk(sk);
1113
1114 del_timer(&llc->rej_sent_timer.timer);
1115 del_timer(&llc->pf_cycle_timer.timer);
1116 del_timer(&llc->busy_state_timer.timer);
1117 llc->ack_must_be_send = 0;
1118 llc->ack_pf = 0;
1119 return 0;
1120 }
1121
1122 int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
1123 {
1124 struct llc_sock *llc = llc_sk(sk);
1125
1126 mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire);
1127 return 0;
1128 }
1129
1130 int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
1131 {
1132 struct llc_sock *llc = llc_sk(sk);
1133
1134 mod_timer(&llc->rej_sent_timer.timer,
1135 jiffies + llc->rej_sent_timer.expire);
1136 return 0;
1137 }
1138
1139 int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
1140 struct sk_buff *skb)
1141 {
1142 struct llc_sock *llc = llc_sk(sk);
1143
1144 if (!timer_pending(&llc->ack_timer.timer))
1145 mod_timer(&llc->ack_timer.timer,
1146 jiffies + llc->ack_timer.expire);
1147 return 0;
1148 }
1149
1150 int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
1151 {
1152 del_timer(&llc_sk(sk)->ack_timer.timer);
1153 return 0;
1154 }
1155
1156 int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
1157 {
1158 struct llc_sock *llc = llc_sk(sk);
1159
1160 del_timer(&llc->pf_cycle_timer.timer);
1161 llc_conn_set_p_flag(sk, 0);
1162 return 0;
1163 }
1164
1165 int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
1166 {
1167 del_timer(&llc_sk(sk)->rej_sent_timer.timer);
1168 return 0;
1169 }
1170
1171 int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
1172 {
1173 int acked;
1174 u16 unacked = 0;
1175 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1176 struct llc_sock *llc = llc_sk(sk);
1177
1178 llc->last_nr = PDU_SUPV_GET_Nr(pdu);
1179 acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
1180 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1181 if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
1182 llc->retry_count = 0;
1183 del_timer(&llc->ack_timer.timer);
1184 if (llc->failed_data_req) {
1185 /* already, we did not accept data from upper layer
1186 * (tx_window full or unacceptable state). Now, we
1187 * can send data and must inform to upper layer.
1188 */
1189 llc->failed_data_req = 0;
1190 llc_conn_ac_data_confirm(sk, skb);
1191 }
1192 if (unacked)
1193 mod_timer(&llc->ack_timer.timer,
1194 jiffies + llc->ack_timer.expire);
1195 } else if (llc->failed_data_req) {
1196 u8 f_bit;
1197
1198 llc_pdu_decode_pf_bit(skb, &f_bit);
1199 if (f_bit == 1) {
1200 llc->failed_data_req = 0;
1201 llc_conn_ac_data_confirm(sk, skb);
1202 }
1203 }
1204 return 0;
1205 }
1206
1207 int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
1208 {
1209 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1210
1211 if (LLC_PDU_IS_RSP(pdu)) {
1212 u8 f_bit;
1213
1214 llc_pdu_decode_pf_bit(skb, &f_bit);
1215 if (f_bit) {
1216 llc_conn_set_p_flag(sk, 0);
1217 llc_conn_ac_stop_p_timer(sk, skb);
1218 }
1219 }
1220 return 0;
1221 }
1222
1223 int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
1224 {
1225 llc_sk(sk)->data_flag = 2;
1226 return 0;
1227 }
1228
1229 int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
1230 {
1231 llc_sk(sk)->data_flag = 0;
1232 return 0;
1233 }
1234
1235 int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
1236 {
1237 llc_sk(sk)->data_flag = 1;
1238 return 0;
1239 }
1240
1241 int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
1242 struct sk_buff *skb)
1243 {
1244 if (!llc_sk(sk)->data_flag)
1245 llc_sk(sk)->data_flag = 1;
1246 return 0;
1247 }
1248
1249 int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
1250 {
1251 llc_conn_set_p_flag(sk, 0);
1252 return 0;
1253 }
1254
1255 static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
1256 {
1257 llc_conn_set_p_flag(sk, 1);
1258 return 0;
1259 }
1260
1261 int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
1262 {
1263 llc_sk(sk)->remote_busy_flag = 0;
1264 return 0;
1265 }
1266
1267 int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
1268 {
1269 llc_sk(sk)->cause_flag = 0;
1270 return 0;
1271 }
1272
1273 int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
1274 {
1275 llc_sk(sk)->cause_flag = 1;
1276 return 0;
1277 }
1278
1279 int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
1280 {
1281 llc_sk(sk)->retry_count = 0;
1282 return 0;
1283 }
1284
1285 int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
1286 {
1287 llc_sk(sk)->retry_count++;
1288 return 0;
1289 }
1290
1291 int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
1292 {
1293 llc_sk(sk)->vR = 0;
1294 return 0;
1295 }
1296
1297 int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
1298 {
1299 llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
1300 return 0;
1301 }
1302
1303 int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
1304 {
1305 llc_sk(sk)->vS = 0;
1306 return 0;
1307 }
1308
1309 int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
1310 {
1311 llc_sk(sk)->vS = llc_sk(sk)->last_nr;
1312 return 0;
1313 }
1314
1315 static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
1316 {
1317 llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO;
1318 return 0;
1319 }
1320
1321 static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
1322 {
1323 struct sock *sk = (struct sock *)timeout_data;
1324 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1325
1326 bh_lock_sock(sk);
1327 if (skb) {
1328 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1329
1330 skb_set_owner_r(skb, sk);
1331 ev->type = type;
1332 llc_process_tmr_ev(sk, skb);
1333 }
1334 bh_unlock_sock(sk);
1335 }
1336
1337 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
1338 {
1339 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR);
1340 }
1341
1342 void llc_conn_busy_tmr_cb(unsigned long timeout_data)
1343 {
1344 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR);
1345 }
1346
1347 void llc_conn_ack_tmr_cb(unsigned long timeout_data)
1348 {
1349 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR);
1350 }
1351
1352 void llc_conn_rej_tmr_cb(unsigned long timeout_data)
1353 {
1354 llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR);
1355 }
1356
1357 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
1358 {
1359 llc_sk(sk)->X = llc_sk(sk)->vS;
1360 llc_conn_ac_set_vs_nr(sk, skb);
1361 return 0;
1362 }
1363
1364 int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
1365 {
1366 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1367 u8 nr = PDU_SUPV_GET_Nr(pdu);
1368
1369 if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
1370 llc_conn_ac_set_vs_nr(sk, skb);
1371 return 0;
1372 }
1373
1374 /*
1375 * Non-standard actions; these not contained in IEEE specification; for
1376 * our own usage
1377 */
1378 /**
1379 * llc_conn_disc - removes connection from SAP list and frees it
1380 * @sk: closed connection
1381 * @skb: occurred event
1382 */
1383 int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
1384 {
1385 /* FIXME: this thing seems to want to die */
1386 return 0;
1387 }
1388
1389 /**
1390 * llc_conn_reset - resets connection
1391 * @sk : reseting connection.
1392 * @skb: occurred event.
1393 *
1394 * Stop all timers, empty all queues and reset all flags.
1395 */
1396 int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
1397 {
1398 llc_sk_reset(sk);
1399 return 0;
1400 }
1401
1402 /**
1403 * llc_circular_between - designates that b is between a and c or not
1404 * @a: lower bound
1405 * @b: element to see if is between a and b
1406 * @c: upper bound
1407 *
1408 * This function designates that b is between a and c or not (for example,
1409 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1410 * otherwise.
1411 */
1412 u8 llc_circular_between(u8 a, u8 b, u8 c)
1413 {
1414 b = b - a;
1415 c = c - a;
1416 return b <= c;
1417 }
1418
1419 /**
1420 * llc_process_tmr_ev - timer backend
1421 * @sk: active connection
1422 * @skb: occurred event
1423 *
1424 * This function is called from timer callback functions. When connection
1425 * is busy (during sending a data frame) timer expiration event must be
1426 * queued. Otherwise this event can be sent to connection state machine.
1427 * Queued events will process by llc_backlog_rcv function after sending
1428 * data frame.
1429 */
1430 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
1431 {
1432 if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
1433 printk(KERN_WARNING "%s: timer called on closed connection\n",
1434 __func__);
1435 kfree_skb(skb);
1436 } else {
1437 if (!sock_owned_by_user(sk))
1438 llc_conn_state_process(sk, skb);
1439 else {
1440 llc_set_backlog_type(skb, LLC_EVENT);
1441 __sk_add_backlog(sk, skb);
1442 }
1443 }
1444 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree