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[LLC]: Make llc_frame_alloc take a net_device as an argument
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / llc / llc_c_ac.c
CommitLineData
1da177e4
LT		 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
32static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb);
33static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb);
34static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev);
35
36static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb);
37
38static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
39 struct sk_buff *skb);
40
41static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb);
42
43#define INCORRECT 0
44
45int 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
61int 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
82int 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
90static 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
98int 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
104int 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
134int 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
143int 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
186int 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
195int 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
207int 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
217int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
218{
219 int rc = -ENOBUFS;
1d67e650
ACM		 220 struct llc_sock *llc = llc_sk(sk);
221 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 222
223 if (nskb) {
1da177e4
LT		 224 struct llc_sap *sap = llc->sap;
225
1da177e4
LT		 226 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
227 llc->daddr.lsap, LLC_PDU_CMD);
228 llc_pdu_init_as_disc_cmd(nskb, 1);
229 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
230 if (rc)
231 goto free;
232 llc_conn_send_pdu(sk, nskb);
233 llc_conn_ac_set_p_flag_1(sk, skb);
234 }
235out:
236 return rc;
237free:
238 kfree_skb(nskb);
239 goto out;
240}
241
242int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
243{
244 int rc = -ENOBUFS;
1d67e650
ACM		 245 struct llc_sock *llc = llc_sk(sk);
246 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 247
248 if (nskb) {
1da177e4
LT		 249 struct llc_sap *sap = llc->sap;
250 u8 f_bit;
251
1da177e4
LT		 252 llc_pdu_decode_pf_bit(skb, &f_bit);
253 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
254 llc->daddr.lsap, LLC_PDU_RSP);
255 llc_pdu_init_as_dm_rsp(nskb, f_bit);
256 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
257 if (rc)
258 goto free;
259 llc_conn_send_pdu(sk, nskb);
260 }
261out:
262 return rc;
263free:
264 kfree_skb(nskb);
265 goto out;
266}
267
268int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
269{
270 int rc = -ENOBUFS;
1d67e650
ACM		 271 struct llc_sock *llc = llc_sk(sk);
272 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 273
274 if (nskb) {
1da177e4
LT		 275 struct llc_sap *sap = llc->sap;
276 u8 f_bit = 1;
277
1da177e4
LT		 278 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
279 llc->daddr.lsap, LLC_PDU_RSP);
280 llc_pdu_init_as_dm_rsp(nskb, f_bit);
281 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
282 if (rc)
283 goto free;
284 llc_conn_send_pdu(sk, nskb);
285 }
286out:
287 return rc;
288free:
289 kfree_skb(nskb);
290 goto out;
291}
292
293int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
294{
295 u8 f_bit;
296 int rc = -ENOBUFS;
297 struct sk_buff *nskb;
298 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
299 struct llc_sock *llc = llc_sk(sk);
300
301 llc->rx_pdu_hdr = *((u32 *)pdu);
302 if (LLC_PDU_IS_CMD(pdu))
303 llc_pdu_decode_pf_bit(skb, &f_bit);
304 else
305 f_bit = 0;
1d67e650 306 nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 307 if (nskb) {
308 struct llc_sap *sap = llc->sap;
309
1da177e4
LT		 310 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
311 llc->daddr.lsap, LLC_PDU_RSP);
312 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
313 llc->vR, INCORRECT);
314 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
315 if (rc)
316 goto free;
317 llc_conn_send_pdu(sk, nskb);
318 }
319out:
320 return rc;
321free:
322 kfree_skb(nskb);
323 goto out;
324}
325
326int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
327{
328 int rc = -ENOBUFS;
1d67e650
ACM		 329 struct llc_sock *llc = llc_sk(sk);
330 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 331
332 if (nskb) {
333 u8 f_bit = 0;
1da177e4
LT		 334 struct llc_sap *sap = llc->sap;
335 struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
336
1da177e4
LT		 337 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
338 llc->daddr.lsap, LLC_PDU_RSP);
339 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
340 llc->vR, INCORRECT);
341 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
342 if (rc)
343 goto free;
344 llc_conn_send_pdu(sk, nskb);
345 }
346out:
347 return rc;
348free:
349 kfree_skb(nskb);
350 goto out;
351}
352
353int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
354{
355 u8 f_bit;
356 int rc = -ENOBUFS;
357 struct sk_buff *nskb;
1d67e650 358 struct llc_sock *llc = llc_sk(sk);
1da177e4
LT		 359
360 llc_pdu_decode_pf_bit(skb, &f_bit);
1d67e650 361 nskb = llc_alloc_frame(llc->dev);
1da177e4 362 if (nskb) {
1da177e4
LT		 363 struct llc_sap *sap = llc->sap;
364 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
365
1da177e4
LT		 366 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
367 llc->daddr.lsap, LLC_PDU_RSP);
368 llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
369 llc->vR, INCORRECT);
370 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
371 if (rc)
372 goto free;
373 llc_conn_send_pdu(sk, nskb);
374 }
375out:
376 return rc;
377free:
378 kfree_skb(nskb);
379 goto out;
380}
381
382int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
383{
384 int rc;
385 struct llc_sock *llc = llc_sk(sk);
386 struct llc_sap *sap = llc->sap;
387
388 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
389 llc->daddr.lsap, LLC_PDU_CMD);
390 llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
391 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
392 if (!rc) {
393 llc_conn_send_pdu(sk, skb);
394 llc_conn_ac_inc_vs_by_1(sk, skb);
395 }
396 return rc;
397}
398
399static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
400{
401 int rc;
402 struct llc_sock *llc = llc_sk(sk);
403 struct llc_sap *sap = llc->sap;
404
405 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
406 llc->daddr.lsap, LLC_PDU_CMD);
407 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
408 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
409 if (!rc) {
410 llc_conn_send_pdu(sk, skb);
411 llc_conn_ac_inc_vs_by_1(sk, skb);
412 }
413 return rc;
414}
415
416int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
417{
418 int rc;
419 struct llc_sock *llc = llc_sk(sk);
420 struct llc_sap *sap = llc->sap;
421
422 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
423 llc->daddr.lsap, LLC_PDU_CMD);
424 llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
425 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
426 if (!rc) {
427 llc_conn_send_pdu(sk, skb);
428 llc_conn_ac_inc_vs_by_1(sk, skb);
429 }
430 return 0;
431}
432
433int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
434{
435 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
436 u8 nr = LLC_I_GET_NR(pdu);
437
438 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
439 return 0;
440}
441
442int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
443 struct sk_buff *skb)
444{
445 u8 nr;
446 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
447 int rc = -ENOBUFS;
1d67e650
ACM		 448 struct llc_sock *llc = llc_sk(sk);
449 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 450
451 if (nskb) {
1da177e4
LT		 452 struct llc_sap *sap = llc->sap;
453
1da177e4
LT		 454 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
455 llc->daddr.lsap, LLC_PDU_RSP);
456 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
457 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
458 if (!rc)
459 llc_conn_send_pdu(sk, nskb);
460 else
461 kfree_skb(skb);
462 }
463 if (rc) {
464 nr = LLC_I_GET_NR(pdu);
465 rc = 0;
466 llc_conn_resend_i_pdu_as_cmd(sk, nr, 0);
467 }
468 return rc;
469}
470
471int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
472{
473 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
474 u8 nr = LLC_I_GET_NR(pdu);
475
476 llc_conn_resend_i_pdu_as_rsp(sk, nr, 1);
477 return 0;
478}
479
480int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
481{
482 int rc = -ENOBUFS;
1d67e650
ACM		 483 struct llc_sock *llc = llc_sk(sk);
484 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 485
486 if (nskb) {
1da177e4
LT		 487 struct llc_sap *sap = llc->sap;
488
1da177e4
LT		 489 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
490 llc->daddr.lsap, LLC_PDU_CMD);
491 llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
492 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
493 if (rc)
494 goto free;
495 llc_conn_send_pdu(sk, nskb);
496 }
497out:
498 return rc;
499free:
500 kfree_skb(nskb);
501 goto out;
502}
503
504int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
505{
506 int rc = -ENOBUFS;
1d67e650
ACM		 507 struct llc_sock *llc = llc_sk(sk);
508 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 509
510 if (nskb) {
511 u8 f_bit = 1;
1da177e4
LT		 512 struct llc_sap *sap = llc->sap;
513
1da177e4
LT		 514 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
515 llc->daddr.lsap, LLC_PDU_RSP);
516 llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
517 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
518 if (rc)
519 goto free;
520 llc_conn_send_pdu(sk, nskb);
521 }
522out:
523 return rc;
524free:
525 kfree_skb(nskb);
526 goto out;
527}
528
529int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
530{
531 int rc = -ENOBUFS;
1d67e650
ACM		 532 struct llc_sock *llc = llc_sk(sk);
533 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 534
535 if (nskb) {
1da177e4
LT		 536 struct llc_sap *sap = llc->sap;
537 u8 f_bit = 0;
538
1da177e4
LT		 539 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
540 llc->daddr.lsap, LLC_PDU_RSP);
541 llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
542 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
543 if (rc)
544 goto free;
545 llc_conn_send_pdu(sk, nskb);
546 }
547out:
548 return rc;
549free:
550 kfree_skb(nskb);
551 goto out;
552}
553
554int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
555{
556 int rc = -ENOBUFS;
1d67e650
ACM		 557 struct llc_sock *llc = llc_sk(sk);
558 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 559
560 if (nskb) {
1da177e4
LT		 561 struct llc_sap *sap = llc->sap;
562
1da177e4
LT		 563 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
564 llc->daddr.lsap, LLC_PDU_CMD);
565 llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
566 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
567 if (rc)
568 goto free;
569 llc_conn_send_pdu(sk, nskb);
570 }
571out:
572 return rc;
573free:
574 kfree_skb(nskb);
575 goto out;
576}
577
578int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
579{
580 int rc = -ENOBUFS;
1d67e650
ACM		 581 struct llc_sock *llc = llc_sk(sk);
582 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 583
584 if (nskb) {
1da177e4
LT		 585 struct llc_sap *sap = llc->sap;
586 u8 f_bit = 1;
587
1da177e4
LT		 588 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
589 llc->daddr.lsap, LLC_PDU_RSP);
590 llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
591 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
592 if (rc)
593 goto free;
594 llc_conn_send_pdu(sk, nskb);
595 }
596out:
597 return rc;
598free:
599 kfree_skb(nskb);
600 goto out;
601}
602
603int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
604{
605 int rc = -ENOBUFS;
1d67e650
ACM		 606 struct llc_sock *llc = llc_sk(sk);
607 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 608
609 if (nskb) {
610 u8 f_bit = 0;
1da177e4
LT		 611 struct llc_sap *sap = llc->sap;
612
1da177e4
LT		 613 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
614 llc->daddr.lsap, LLC_PDU_RSP);
615 llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
616 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
617 if (rc)
618 goto free;
619 llc_conn_send_pdu(sk, nskb);
620 }
621out:
622 return rc;
623free:
624 kfree_skb(nskb);
625 goto out;
626}
627
628int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
629{
630 struct llc_sock *llc = llc_sk(sk);
631
632 if (!llc->remote_busy_flag) {
633 llc->remote_busy_flag = 1;
634 mod_timer(&llc->busy_state_timer.timer,
635 jiffies + llc->busy_state_timer.expire * HZ);
636 }
637 return 0;
638}
639
640int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
641{
642 int rc = -ENOBUFS;
1d67e650
ACM		 643 struct llc_sock *llc = llc_sk(sk);
644 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 645
646 if (nskb) {
1da177e4
LT		 647 struct llc_sap *sap = llc->sap;
648
1da177e4
LT		 649 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
650 llc->daddr.lsap, LLC_PDU_RSP);
651 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
652 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
653 if (rc)
654 goto free;
655 llc_conn_send_pdu(sk, nskb);
656 }
657out:
658 return rc;
659free:
660 kfree_skb(nskb);
661 goto out;
662}
663
664int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
665{
666 int rc = -ENOBUFS;
1d67e650
ACM		 667 struct llc_sock *llc = llc_sk(sk);
668 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 669
670 if (nskb) {
1da177e4
LT		 671 struct llc_sap *sap = llc->sap;
672
1da177e4
LT		 673 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
674 llc->daddr.lsap, LLC_PDU_CMD);
675 llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
676 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
677 if (rc)
678 goto free;
679 llc_conn_send_pdu(sk, nskb);
680 }
681out:
682 return rc;
683free:
684 kfree_skb(nskb);
685 goto out;
686}
687
688int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
689{
690 int rc = -ENOBUFS;
1d67e650
ACM		 691 struct llc_sock *llc = llc_sk(sk);
692 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 693
694 if (nskb) {
1da177e4
LT		 695 struct llc_sap *sap = llc->sap;
696 u8 f_bit = 1;
697
1da177e4
LT		 698 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
699 llc->daddr.lsap, LLC_PDU_RSP);
700 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
701 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
702 if (rc)
703 goto free;
704 llc_conn_send_pdu(sk, nskb);
705 }
706out:
707 return rc;
708free:
709 kfree_skb(nskb);
710 goto out;
711}
712
713int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
714{
715 int rc = -ENOBUFS;
1d67e650
ACM		 716 struct llc_sock *llc = llc_sk(sk);
717 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 718
719 if (nskb) {
1da177e4
LT		 720 struct llc_sap *sap = llc->sap;
721 u8 f_bit = 1;
722
1da177e4
LT		 723 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
724 llc->daddr.lsap, LLC_PDU_RSP);
725 llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
726 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
727 if (rc)
728 goto free;
729 llc_conn_send_pdu(sk, nskb);
730 }
731out:
732 return rc;
733free:
734 kfree_skb(nskb);
735 goto out;
736}
737
738int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
739{
740 int rc = -ENOBUFS;
1d67e650
ACM		 741 struct llc_sock *llc = llc_sk(sk);
742 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 743
744 if (nskb) {
1da177e4
LT		 745 struct llc_sap *sap = llc->sap;
746
1da177e4
LT		 747 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
748 llc->daddr.lsap, LLC_PDU_RSP);
749 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
750 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
751 if (rc)
752 goto free;
753 llc_conn_send_pdu(sk, nskb);
754 }
755out:
756 return rc;
757free:
758 kfree_skb(nskb);
759 goto out;
760}
761
762int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
763{
764 int rc = -ENOBUFS;
1d67e650
ACM		 765 struct llc_sock *llc = llc_sk(sk);
766 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 767
768 if (nskb) {
1da177e4
LT		 769 struct llc_sap *sap = llc->sap;
770
1da177e4
LT		 771 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
772 llc->daddr.lsap, LLC_PDU_RSP);
773 llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
774 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
775 if (rc)
776 goto free;
777 llc_conn_send_pdu(sk, nskb);
778 }
779out:
780 return rc;
781free:
782 kfree_skb(nskb);
783 goto out;
784}
785
786void llc_conn_set_p_flag(struct sock *sk, u8 value)
787{
788 int state_changed = llc_sk(sk)->p_flag && !value;
789
790 llc_sk(sk)->p_flag = value;
791
792 if (state_changed)
793 sk->sk_state_change(sk);
794}
795
796int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
797{
798 int rc = -ENOBUFS;
1da177e4 799 struct llc_sock *llc = llc_sk(sk);
1d67e650 800 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 801
802 if (nskb) {
803 struct llc_sap *sap = llc->sap;
804 u8 *dmac = llc->daddr.mac;
805
806 if (llc->dev->flags & IFF_LOOPBACK)
807 dmac = llc->dev->dev_addr;
1da177e4
LT		 808 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
809 llc->daddr.lsap, LLC_PDU_CMD);
810 llc_pdu_init_as_sabme_cmd(nskb, 1);
811 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
812 if (rc)
813 goto free;
814 llc_conn_send_pdu(sk, nskb);
815 llc_conn_set_p_flag(sk, 1);
816 }
817out:
818 return rc;
819free:
820 kfree_skb(nskb);
821 goto out;
822}
823
824int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
825{
826 u8 f_bit;
827 int rc = -ENOBUFS;
1d67e650
ACM		 828 struct llc_sock *llc = llc_sk(sk);
829 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 830
831 llc_pdu_decode_pf_bit(skb, &f_bit);
832 if (nskb) {
1da177e4
LT		 833 struct llc_sap *sap = llc->sap;
834
835 nskb->dev = llc->dev;
836 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
837 llc->daddr.lsap, LLC_PDU_RSP);
838 llc_pdu_init_as_ua_rsp(nskb, f_bit);
839 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
840 if (rc)
841 goto free;
842 llc_conn_send_pdu(sk, nskb);
843 }
844out:
845 return rc;
846free:
847 kfree_skb(nskb);
848 goto out;
849}
850
851int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb)
852{
853 llc_sk(sk)->s_flag = 0;
854 return 0;
855}
856
857int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb)
858{
859 llc_sk(sk)->s_flag = 1;
860 return 0;
861}
862
863int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
864{
865 struct llc_sock *llc = llc_sk(sk);
866
867 llc_conn_set_p_flag(sk, 1);
868 mod_timer(&llc->pf_cycle_timer.timer,
869 jiffies + llc->pf_cycle_timer.expire * HZ);
870 return 0;
871}
872
873/**
874 * llc_conn_ac_send_ack_if_needed - check if ack is needed
875 * @sk: current connection structure
876 * @skb: current event
877 *
878 * Checks number of received PDUs which have not been acknowledged, yet,
879 * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then
880 * sends an RR response as acknowledgement for them. Returns 0 for
881 * success, 1 otherwise.
882 */
883int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb)
884{
885 u8 pf_bit;
886 struct llc_sock *llc = llc_sk(sk);
887
888 llc_pdu_decode_pf_bit(skb, &pf_bit);
889 llc->ack_pf |= pf_bit & 1;
890 if (!llc->ack_must_be_send) {
891 llc->first_pdu_Ns = llc->vR;
892 llc->ack_must_be_send = 1;
893 llc->ack_pf = pf_bit & 1;
894 }
895 if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) {
896 llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb);
897 llc->ack_must_be_send = 0;
898 llc->ack_pf = 0;
899 llc_conn_ac_inc_npta_value(sk, skb);
900 }
901 return 0;
902}
903
904/**
905 * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag
906 * @sk: current connection structure
907 * @skb: current event
908 *
909 * This action resets ack_must_be_send flag of given connection, this flag
910 * indicates if there is any PDU which has not been acknowledged yet.
911 * Returns 0 for success, 1 otherwise.
912 */
913int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb)
914{
915 llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0;
916 return 0;
917}
918
919/**
920 * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs
921 * @sk: current connection structure
922 * @skb: current event
923 *
924 * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to
925 * all received PDUs which have not been acknowledged, yet. ack_pf flag is
926 * set to one if one PDU with p-bit set to one is received. Returns 0 for
927 * success, 1 otherwise.
928 */
929static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
930 struct sk_buff *skb)
931{
932 int rc;
933 struct llc_sock *llc = llc_sk(sk);
934 struct llc_sap *sap = llc->sap;
935
936 llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap,
937 llc->daddr.lsap, LLC_PDU_RSP);
938 llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
939 rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
940 if (!rc) {
941 llc_conn_send_pdu(sk, skb);
942 llc_conn_ac_inc_vs_by_1(sk, skb);
943 }
944 return rc;
945}
946
947/**
948 * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs
949 * @sk: current connection structure.
950 * @skb: current event.
951 *
952 * This action sends an I-format PDU as acknowledge to received PDUs which
953 * have not been acknowledged, yet, if there is any. By using of this
954 * action number of acknowledgements decreases, this technic is called
955 * piggy backing. Returns 0 for success, 1 otherwise.
956 */
957int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
958{
959 struct llc_sock *llc = llc_sk(sk);
960
961 if (llc->ack_must_be_send) {
962 llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
963 llc->ack_must_be_send = 0 ;
964 llc->ack_pf = 0;
965 } else
966 llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
967 return 0;
968}
969
970/**
971 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
972 * @sk: current connection structure.
973 * @skb: current event.
974 *
975 * This action sends an RR response with f-bit set to ack_pf flag as
976 * acknowledge to all received PDUs which have not been acknowledged, yet,
977 * if there is any. ack_pf flag indicates if a PDU has been received with
978 * p-bit set to one. Returns 0 for success, 1 otherwise.
979 */
980static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
981 struct sk_buff *skb)
982{
983 int rc = -ENOBUFS;
1d67e650
ACM		 984 struct llc_sock *llc = llc_sk(sk);
985 struct sk_buff *nskb = llc_alloc_frame(llc->dev);
1da177e4
LT		 986
987 if (nskb) {
1da177e4
LT		 988 struct llc_sap *sap = llc->sap;
989
1da177e4
LT		 990 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
991 llc->daddr.lsap, LLC_PDU_RSP);
992 llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
993 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
994 if (rc)
995 goto free;
996 llc_conn_send_pdu(sk, nskb);
997 }
998out:
999 return rc;
1000free:
1001 kfree_skb(nskb);
1002 goto out;
1003}
1004
1005/**
1006 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
1007 * @sk: current connection structure.
1008 * @skb: current event.
1009 *
1010 * After "inc_cntr" times calling of this action, "npta" increase by one.
1011 * this action tries to make vale of "npta" greater as possible; number of
1012 * acknowledgements decreases by increasing of "npta". Returns 0 for
1013 * success, 1 otherwise.
1014 */
1015static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
1016{
1017 struct llc_sock *llc = llc_sk(sk);
1018
1019 if (!llc->inc_cntr) {
1020 llc->dec_step = 0;
1021 llc->dec_cntr = llc->inc_cntr = 2;
1022 ++llc->npta;
1023 if (llc->npta > 127)
1024 llc->npta = 127 ;
1025 } else
1026 --llc->inc_cntr;
1027 return 0;
1028}
1029
1030/**
1031 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1032 * @sk: current connection structure.
1033 * @skb: current event.
1034 *
1035 * After receiving "dec_cntr" times RR command, this action decreases
1036 * "npta" by one. Returns 0 for success, 1 otherwise.
1037 */
1038int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
1039{
1040 struct llc_sock *llc = llc_sk(sk);
1041
1042 if (!llc->connect_step && !llc->remote_busy_flag) {
1043 if (!llc->dec_step) {
1044 if (!llc->dec_cntr) {
1045 llc->inc_cntr = llc->dec_cntr = 2;
1046 if (llc->npta > 0)
1047 llc->npta = llc->npta - 1;
1048 } else
1049 llc->dec_cntr -=1;
1050 }
1051 } else
1052 llc->connect_step = 0 ;
1053 return 0;
1054}
1055
1056/**
1057 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1058 * @sk: current connection structure.
1059 * @skb: current event.
1060 *
1061 * After receiving "dec_cntr" times RNR command, this action decreases
1062 * "npta" by one. Returns 0 for success, 1 otherwise.
1063 */
1064int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
1065{
1066 struct llc_sock *llc = llc_sk(sk);
1067
1068 if (llc->remote_busy_flag)
1069 if (!llc->dec_step) {
1070 if (!llc->dec_cntr) {
1071 llc->inc_cntr = llc->dec_cntr = 2;
1072 if (llc->npta > 0)
1073 --llc->npta;
1074 } else
1075 --llc->dec_cntr;
1076 }
1077 return 0;
1078}
1079
1080/**
1081 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1082 * @sk: current connection structure.
1083 * @skb: current event.
1084 *
1085 * After receiving of a REJ command or response, transmit window size is
1086 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1087 * success, 1 otherwise.
1088 */
1089int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
1090{
1091 struct llc_sock *llc = llc_sk(sk);
1092 u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
1093
1094 llc->k -= unacked_pdu;
1095 if (llc->k < 2)
1096 llc->k = 2;
1097 return 0;
1098}
1099
1100/**
1101 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1102 * @sk: current connection structure.
1103 * @skb: current event.
1104 *
1105 * After receiving an RR response with f-bit set to one, transmit window
1106 * size is increased by one. Returns 0 for success, 1 otherwise.
1107 */
1108int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
1109{
1110 struct llc_sock *llc = llc_sk(sk);
1111
1112 llc->k += 1;
1113 if (llc->k > 128)
1114 llc->k = 128 ;
1115 return 0;
1116}
1117
1118int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
1119{
1120 struct llc_sock *llc = llc_sk(sk);
1121
1122 del_timer(&llc->pf_cycle_timer.timer);
1123 del_timer(&llc->ack_timer.timer);
1124 del_timer(&llc->rej_sent_timer.timer);
1125 del_timer(&llc->busy_state_timer.timer);
1126 llc->ack_must_be_send = 0;
1127 llc->ack_pf = 0;
1128 return 0;
1129}
1130
1131int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
1132{
1133 struct llc_sock *llc = llc_sk(sk);
1134
1135 del_timer(&llc->rej_sent_timer.timer);
1136 del_timer(&llc->pf_cycle_timer.timer);
1137 del_timer(&llc->busy_state_timer.timer);
1138 llc->ack_must_be_send = 0;
1139 llc->ack_pf = 0;
1140 return 0;
1141}
1142
1143int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
1144{
1145 struct llc_sock *llc = llc_sk(sk);
1146
1147 mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ);
1148 return 0;
1149}
1150
1151int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
1152{
1153 struct llc_sock *llc = llc_sk(sk);
1154
1155 mod_timer(&llc->rej_sent_timer.timer,
1156 jiffies + llc->rej_sent_timer.expire * HZ);
1157 return 0;
1158}
1159
1160int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
1161 struct sk_buff *skb)
1162{
1163 struct llc_sock *llc = llc_sk(sk);
1164
1165 if (!timer_pending(&llc->ack_timer.timer))
1166 mod_timer(&llc->ack_timer.timer,
1167 jiffies + llc->ack_timer.expire * HZ);
1168 return 0;
1169}
1170
1171int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
1172{
1173 del_timer(&llc_sk(sk)->ack_timer.timer);
1174 return 0;
1175}
1176
1177int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
1178{
1179 struct llc_sock *llc = llc_sk(sk);
1180
1181 del_timer(&llc->pf_cycle_timer.timer);
1182 llc_conn_set_p_flag(sk, 0);
1183 return 0;
1184}
1185
1186int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
1187{
1188 del_timer(&llc_sk(sk)->rej_sent_timer.timer);
1189 return 0;
1190}
1191
1192int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
1193{
1194 int acked;
1195 u16 unacked = 0;
1196 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1197 struct llc_sock *llc = llc_sk(sk);
1198
1199 llc->last_nr = PDU_SUPV_GET_Nr(pdu);
1200 acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
1201 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1202 if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
1203 llc->retry_count = 0;
1204 del_timer(&llc->ack_timer.timer);
1205 if (llc->failed_data_req) {
1206 /* already, we did not accept data from upper layer
1207 * (tx_window full or unacceptable state). Now, we
1208 * can send data and must inform to upper layer.
1209 */
1210 llc->failed_data_req = 0;
1211 llc_conn_ac_data_confirm(sk, skb);
1212 }
1213 if (unacked)
1214 mod_timer(&llc->ack_timer.timer,
1215 jiffies + llc->ack_timer.expire * HZ);
1216 } else if (llc->failed_data_req) {
1217 u8 f_bit;
1218
1219 llc_pdu_decode_pf_bit(skb, &f_bit);
1220 if (f_bit == 1) {
1221 llc->failed_data_req = 0;
1222 llc_conn_ac_data_confirm(sk, skb);
1223 }
1224 }
1225 return 0;
1226}
1227
1228int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
1229{
1230 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1231
1232 if (LLC_PDU_IS_RSP(pdu)) {
1233 u8 f_bit;
1234
1235 llc_pdu_decode_pf_bit(skb, &f_bit);
1236 if (f_bit) {
1237 llc_conn_set_p_flag(sk, 0);
1238 llc_conn_ac_stop_p_timer(sk, skb);
1239 }
1240 }
1241 return 0;
1242}
1243
1244int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
1245{
1246 llc_sk(sk)->data_flag = 2;
1247 return 0;
1248}
1249
1250int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
1251{
1252 llc_sk(sk)->data_flag = 0;
1253 return 0;
1254}
1255
1256int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
1257{
1258 llc_sk(sk)->data_flag = 1;
1259 return 0;
1260}
1261
1262int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
1263 struct sk_buff *skb)
1264{
1265 if (!llc_sk(sk)->data_flag)
1266 llc_sk(sk)->data_flag = 1;
1267 return 0;
1268}
1269
1270int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
1271{
1272 llc_conn_set_p_flag(sk, 0);
1273 return 0;
1274}
1275
1276static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
1277{
1278 llc_conn_set_p_flag(sk, 1);
1279 return 0;
1280}
1281
1282int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
1283{
1284 llc_sk(sk)->remote_busy_flag = 0;
1285 return 0;
1286}
1287
1288int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
1289{
1290 llc_sk(sk)->cause_flag = 0;
1291 return 0;
1292}
1293
1294int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
1295{
1296 llc_sk(sk)->cause_flag = 1;
1297 return 0;
1298}
1299
1300int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
1301{
1302 llc_sk(sk)->retry_count = 0;
1303 return 0;
1304}
1305
1306int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
1307{
1308 llc_sk(sk)->retry_count++;
1309 return 0;
1310}
1311
1312int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
1313{
1314 llc_sk(sk)->vR = 0;
1315 return 0;
1316}
1317
1318int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
1319{
1320 llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
1321 return 0;
1322}
1323
1324int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
1325{
1326 llc_sk(sk)->vS = 0;
1327 return 0;
1328}
1329
1330int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
1331{
1332 llc_sk(sk)->vS = llc_sk(sk)->last_nr;
1333 return 0;
1334}
1335
1336int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
1337{
1338 llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128;
1339 return 0;
1340}
1341
1342void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
1343{
1344 struct sock *sk = (struct sock *)timeout_data;
1345 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1346
1347 bh_lock_sock(sk);
1348 if (skb) {
1349 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1350
1351 skb->sk = sk;
1352 ev->type = LLC_CONN_EV_TYPE_P_TMR;
1353 llc_process_tmr_ev(sk, skb);
1354 }
1355 bh_unlock_sock(sk);
1356}
1357
1358void llc_conn_busy_tmr_cb(unsigned long timeout_data)
1359{
1360 struct sock *sk = (struct sock *)timeout_data;
1361 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1362
1363 bh_lock_sock(sk);
1364 if (skb) {
1365 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1366
1367 skb->sk = sk;
1368 ev->type = LLC_CONN_EV_TYPE_BUSY_TMR;
1369 llc_process_tmr_ev(sk, skb);
1370 }
1371 bh_unlock_sock(sk);
1372}
1373
1374void llc_conn_ack_tmr_cb(unsigned long timeout_data)
1375{
1376 struct sock* sk = (struct sock *)timeout_data;
1377 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1378
1379 bh_lock_sock(sk);
1380 if (skb) {
1381 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1382
1383 skb->sk = sk;
1384 ev->type = LLC_CONN_EV_TYPE_ACK_TMR;
1385 llc_process_tmr_ev(sk, skb);
1386 }
1387 bh_unlock_sock(sk);
1388}
1389
1390void llc_conn_rej_tmr_cb(unsigned long timeout_data)
1391{
1392 struct sock *sk = (struct sock *)timeout_data;
1393 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1394
1395 bh_lock_sock(sk);
1396 if (skb) {
1397 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1398
1399 skb->sk = sk;
1400 ev->type = LLC_CONN_EV_TYPE_REJ_TMR;
1401 llc_process_tmr_ev(sk, skb);
1402 }
1403 bh_unlock_sock(sk);
1404}
1405
1406int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
1407{
1408 llc_sk(sk)->X = llc_sk(sk)->vS;
1409 llc_conn_ac_set_vs_nr(sk, skb);
1410 return 0;
1411}
1412
1413int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
1414{
1415 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1416 u8 nr = PDU_SUPV_GET_Nr(pdu);
1417
1418 if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
1419 llc_conn_ac_set_vs_nr(sk, skb);
1420 return 0;
1421}
1422
1423/*
1424 * Non-standard actions; these not contained in IEEE specification; for
1425 * our own usage
1426 */
1427/**
1428 * llc_conn_disc - removes connection from SAP list and frees it
1429 * @sk: closed connection
1430 * @skb: occurred event
1431 */
1432int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
1433{
1434 /* FIXME: this thing seems to want to die */
1435 return 0;
1436}
1437
1438/**
1439 * llc_conn_reset - resets connection
1440 * @sk : reseting connection.
1441 * @skb: occurred event.
1442 *
1443 * Stop all timers, empty all queues and reset all flags.
1444 */
1445int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
1446{
1447 llc_sk_reset(sk);
1448 return 0;
1449}
1450
1451/**
1452 * llc_circular_between - designates that b is between a and c or not
1453 * @a: lower bound
1454 * @b: element to see if is between a and b
1455 * @c: upper bound
1456 *
1457 * This function designates that b is between a and c or not (for example,
1458 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1459 * otherwise.
1460 */
1461u8 llc_circular_between(u8 a, u8 b, u8 c)
1462{
1463 b = b - a;
1464 c = c - a;
1465 return b <= c;
1466}
1467
1468/**
1469 * llc_process_tmr_ev - timer backend
1470 * @sk: active connection
1471 * @skb: occurred event
1472 *
1473 * This function is called from timer callback functions. When connection
1474 * is busy (during sending a data frame) timer expiration event must be
1475 * queued. Otherwise this event can be sent to connection state machine.
1476 * Queued events will process by llc_backlog_rcv function after sending
1477 * data frame.
1478 */
1479static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
1480{
1481 if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
1482 printk(KERN_WARNING "%s: timer called on closed connection\n",
1483 __FUNCTION__);
1484 kfree_skb(skb);
1485 } else {
1486 if (!sock_owned_by_user(sk))
1487 llc_conn_state_process(sk, skb);
1488 else {
1489 llc_set_backlog_type(skb, LLC_EVENT);
1490 sk_add_backlog(sk, skb);
1491 }
1492 }
1493}
kernel source for telekom puls (alcatel/mediatek)