blob: 163121192acae1c88f6a81d7a594c189da3678da [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
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{
Arnaldo Carvalho de Melod3894242005-09-22 07:57:21 -030063 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Arnaldo Carvalho de Melod3894242005-09-22 07:57:21 -030065 ev->ind_prim = LLC_CONN_PRIM;
66 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
69int 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
77static 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
85int 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
91int 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;
Arnaldo Carvalho de Melobdcc66c2005-09-22 03:38:15 -0300110 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (!rc) {
113 ev->reason = reason;
114 ev->ind_prim = LLC_DISC_PRIM;
115 }
116 return rc;
117}
118
119int 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
128int 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
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;
Arnaldo Carvalho de Melobdcc66c2005-09-22 03:38:15 -0300157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 break;
159 }
160 if (!rc) {
161 ev->reason = reason;
162 ev->ind_prim = LLC_RESET_PRIM;
163 }
164 return rc;
165}
166
167int 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
176int 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
188int 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
198int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
199{
200 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300201 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700202 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 struct llc_sap *sap = llc->sap;
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300211 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 goto free;
213 llc_conn_send_pdu(sk, nskb);
214 llc_conn_ac_set_p_flag_1(sk, skb);
215 }
216out:
217 return rc;
218free:
219 kfree_skb(nskb);
220 goto out;
221}
222
223int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
224{
225 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300226 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700227 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct llc_sap *sap = llc->sap;
231 u8 f_bit;
232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300238 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 goto free;
240 llc_conn_send_pdu(sk, nskb);
241 }
242out:
243 return rc;
244free:
245 kfree_skb(nskb);
246 goto out;
247}
248
249int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
250{
251 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300252 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700253 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 struct llc_sap *sap = llc->sap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
259 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300260 llc_pdu_init_as_dm_rsp(nskb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300262 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 goto free;
264 llc_conn_send_pdu(sk, nskb);
265 }
266out:
267 return rc;
268free:
269 kfree_skb(nskb);
270 goto out;
271}
272
273int 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;
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700286 nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
287 sizeof(struct llc_frmr_info));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 if (nskb) {
289 struct llc_sap *sap = llc->sap;
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300296 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 goto free;
298 llc_conn_send_pdu(sk, nskb);
299 }
300out:
301 return rc;
302free:
303 kfree_skb(nskb);
304 goto out;
305}
306
307int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
308{
309 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300310 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700311 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
312 sizeof(struct llc_frmr_info));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 struct llc_sap *sap = llc->sap;
316 struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
319 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300320 llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 llc->vR, INCORRECT);
322 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300323 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 goto free;
325 llc_conn_send_pdu(sk, nskb);
326 }
327out:
328 return rc;
329free:
330 kfree_skb(nskb);
331 goto out;
332}
333
334int 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;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300339 struct llc_sock *llc = llc_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341 llc_pdu_decode_pf_bit(skb, &f_bit);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700342 nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
343 sizeof(struct llc_frmr_info));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 struct llc_sap *sap = llc->sap;
346 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300353 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 goto free;
355 llc_conn_send_pdu(sk, nskb);
356 }
357out:
358 return rc;
359free:
360 kfree_skb(nskb);
361 goto out;
362}
363
364int 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300374 if (likely(!rc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 llc_conn_send_pdu(sk, skb);
376 llc_conn_ac_inc_vs_by_1(sk, skb);
377 }
378 return rc;
379}
380
381static 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300391 if (likely(!rc)) {
Cong Wangb85ab562018-03-26 15:08:33 -0700392 rc = llc_conn_send_pdu(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 llc_conn_ac_inc_vs_by_1(sk, skb);
394 }
395 return rc;
396}
397
398int 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300408 if (likely(!rc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 llc_conn_send_pdu(sk, skb);
410 llc_conn_ac_inc_vs_by_1(sk, skb);
411 }
412 return 0;
413}
414
415int 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
424int 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;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300430 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700431 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 struct llc_sap *sap = llc->sap;
435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300440 if (likely(!rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 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
453int 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
462int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
463{
464 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300465 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700466 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 struct llc_sap *sap = llc->sap;
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300475 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 goto free;
477 llc_conn_send_pdu(sk, nskb);
478 }
479out:
480 return rc;
481free:
482 kfree_skb(nskb);
483 goto out;
484}
485
486int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
487{
488 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300489 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700490 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 struct llc_sap *sap = llc->sap;
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
496 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300497 llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300499 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 goto free;
501 llc_conn_send_pdu(sk, nskb);
502 }
503out:
504 return rc;
505free:
506 kfree_skb(nskb);
507 goto out;
508}
509
510int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
511{
512 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300513 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700514 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 struct llc_sap *sap = llc->sap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
520 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300521 llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300523 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 goto free;
525 llc_conn_send_pdu(sk, nskb);
526 }
527out:
528 return rc;
529free:
530 kfree_skb(nskb);
531 goto out;
532}
533
534int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
535{
536 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300537 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700538 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 struct llc_sap *sap = llc->sap;
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300547 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 goto free;
549 llc_conn_send_pdu(sk, nskb);
550 }
551out:
552 return rc;
553free:
554 kfree_skb(nskb);
555 goto out;
556}
557
558int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
559{
560 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300561 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700562 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 struct llc_sap *sap = llc->sap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
568 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300569 llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300571 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 goto free;
573 llc_conn_send_pdu(sk, nskb);
574 }
575out:
576 return rc;
577free:
578 kfree_skb(nskb);
579 goto out;
580}
581
582int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
583{
584 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300585 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700586 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 struct llc_sap *sap = llc->sap;
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
592 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300593 llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300595 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 goto free;
597 llc_conn_send_pdu(sk, nskb);
598 }
599out:
600 return rc;
601free:
602 kfree_skb(nskb);
603 goto out;
604}
605
606int 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,
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -0300613 jiffies + llc->busy_state_timer.expire);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 }
615 return 0;
616}
617
618int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
619{
620 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300621 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700622 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
624 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 struct llc_sap *sap = llc->sap;
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300631 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 goto free;
633 llc_conn_send_pdu(sk, nskb);
634 }
635out:
636 return rc;
637free:
638 kfree_skb(nskb);
639 goto out;
640}
641
642int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
643{
644 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300645 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700646 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 struct llc_sap *sap = llc->sap;
650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300655 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 goto free;
657 llc_conn_send_pdu(sk, nskb);
658 }
659out:
660 return rc;
661free:
662 kfree_skb(nskb);
663 goto out;
664}
665
666int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
667{
668 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300669 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700670 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 struct llc_sap *sap = llc->sap;
674 u8 f_bit = 1;
675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300680 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 goto free;
682 llc_conn_send_pdu(sk, nskb);
683 }
684out:
685 return rc;
686free:
687 kfree_skb(nskb);
688 goto out;
689}
690
691int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
692{
693 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300694 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700695 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 struct llc_sap *sap = llc->sap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
701 llc->daddr.lsap, LLC_PDU_RSP);
Arnaldo Carvalho de Melo838a75d2005-09-22 03:44:23 -0300702 llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300704 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 goto free;
706 llc_conn_send_pdu(sk, nskb);
707 }
708out:
709 return rc;
710free:
711 kfree_skb(nskb);
712 goto out;
713}
714
715int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
716{
717 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300718 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700719 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 struct llc_sap *sap = llc->sap;
723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300728 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 goto free;
730 llc_conn_send_pdu(sk, nskb);
731 }
732out:
733 return rc;
734free:
735 kfree_skb(nskb);
736 goto out;
737}
738
739int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
740{
741 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300742 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700743 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
745 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 struct llc_sap *sap = llc->sap;
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300752 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 goto free;
754 llc_conn_send_pdu(sk, nskb);
755 }
756out:
757 return rc;
758free:
759 kfree_skb(nskb);
760 goto out;
761}
762
763void 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
773int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
774{
775 int rc = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700777 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300789 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 goto free;
791 llc_conn_send_pdu(sk, nskb);
792 llc_conn_set_p_flag(sk, 1);
793 }
794out:
795 return rc;
796free:
797 kfree_skb(nskb);
798 goto out;
799}
800
801int 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;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300805 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700806 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
808 llc_pdu_decode_pf_bit(skb, &f_bit);
809 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300817 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 goto free;
819 llc_conn_send_pdu(sk, nskb);
820 }
821out:
822 return rc;
823free:
824 kfree_skb(nskb);
825 goto out;
826}
827
828int 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
834int 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
840int 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,
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -0300846 jiffies + llc->pf_cycle_timer.expire);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 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 */
860int 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 }
Jochen Friedrich59c61962005-11-14 21:57:15 -0800872 if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO)
873 % LLC_2_SEQ_NBR_MODULO) >= llc->npta) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 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 */
891int 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 */
907static 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);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300918 if (likely(!rc)) {
Cong Wangb85ab562018-03-26 15:08:33 -0700919 rc = llc_conn_send_pdu(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 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 */
935int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
936{
937 struct llc_sock *llc = llc_sk(sk);
Cong Wangb85ab562018-03-26 15:08:33 -0700938 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
940 if (llc->ack_must_be_send) {
Cong Wangb85ab562018-03-26 15:08:33 -0700941 ret = llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 llc->ack_must_be_send = 0 ;
943 llc->ack_pf = 0;
Cong Wangb85ab562018-03-26 15:08:33 -0700944 } else {
945 ret = llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
946 }
947
948 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949}
950
951/**
952 * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked
953 * @sk: current connection structure.
954 * @skb: current event.
955 *
956 * This action sends an RR response with f-bit set to ack_pf flag as
957 * acknowledge to all received PDUs which have not been acknowledged, yet,
958 * if there is any. ack_pf flag indicates if a PDU has been received with
959 * p-bit set to one. Returns 0 for success, 1 otherwise.
960 */
961static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
962 struct sk_buff *skb)
963{
964 int rc = -ENOBUFS;
Arnaldo Carvalho de Melo1d67e652005-09-22 03:27:56 -0300965 struct llc_sock *llc = llc_sk(sk);
Joonwoo Parkf83f1762008-03-31 21:02:47 -0700966 struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
968 if (nskb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 struct llc_sap *sap = llc->sap;
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
972 llc->daddr.lsap, LLC_PDU_RSP);
973 llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
974 rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300975 if (unlikely(rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 goto free;
977 llc_conn_send_pdu(sk, nskb);
978 }
979out:
980 return rc;
981free:
982 kfree_skb(nskb);
983 goto out;
984}
985
986/**
987 * llc_conn_ac_inc_npta_value - tries to make value of npta greater
988 * @sk: current connection structure.
989 * @skb: current event.
990 *
991 * After "inc_cntr" times calling of this action, "npta" increase by one.
992 * this action tries to make vale of "npta" greater as possible; number of
993 * acknowledgements decreases by increasing of "npta". Returns 0 for
994 * success, 1 otherwise.
995 */
996static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb)
997{
998 struct llc_sock *llc = llc_sk(sk);
999
1000 if (!llc->inc_cntr) {
1001 llc->dec_step = 0;
1002 llc->dec_cntr = llc->inc_cntr = 2;
1003 ++llc->npta;
David S. Miller38199822005-11-17 15:17:42 -08001004 if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO)
1005 llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 } else
1007 --llc->inc_cntr;
1008 return 0;
1009}
1010
1011/**
1012 * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one
1013 * @sk: current connection structure.
1014 * @skb: current event.
1015 *
1016 * After receiving "dec_cntr" times RR command, this action decreases
1017 * "npta" by one. Returns 0 for success, 1 otherwise.
1018 */
1019int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb)
1020{
1021 struct llc_sock *llc = llc_sk(sk);
1022
1023 if (!llc->connect_step && !llc->remote_busy_flag) {
1024 if (!llc->dec_step) {
1025 if (!llc->dec_cntr) {
1026 llc->inc_cntr = llc->dec_cntr = 2;
1027 if (llc->npta > 0)
1028 llc->npta = llc->npta - 1;
1029 } else
1030 llc->dec_cntr -=1;
1031 }
1032 } else
1033 llc->connect_step = 0 ;
1034 return 0;
1035}
1036
1037/**
1038 * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one
1039 * @sk: current connection structure.
1040 * @skb: current event.
1041 *
1042 * After receiving "dec_cntr" times RNR command, this action decreases
1043 * "npta" by one. Returns 0 for success, 1 otherwise.
1044 */
1045int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb)
1046{
1047 struct llc_sock *llc = llc_sk(sk);
1048
1049 if (llc->remote_busy_flag)
1050 if (!llc->dec_step) {
1051 if (!llc->dec_cntr) {
1052 llc->inc_cntr = llc->dec_cntr = 2;
1053 if (llc->npta > 0)
1054 --llc->npta;
1055 } else
1056 --llc->dec_cntr;
1057 }
1058 return 0;
1059}
1060
1061/**
1062 * llc_conn_ac_dec_tx_win_size - decreases tx window size
1063 * @sk: current connection structure.
1064 * @skb: current event.
1065 *
1066 * After receiving of a REJ command or response, transmit window size is
1067 * decreased by number of PDUs which are outstanding yet. Returns 0 for
1068 * success, 1 otherwise.
1069 */
1070int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb)
1071{
1072 struct llc_sock *llc = llc_sk(sk);
1073 u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q);
1074
Jochen Friedrich59c61962005-11-14 21:57:15 -08001075 if (llc->k - unacked_pdu < 1)
1076 llc->k = 1;
1077 else
1078 llc->k -= unacked_pdu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 return 0;
1080}
1081
1082/**
1083 * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1
1084 * @sk: current connection structure.
1085 * @skb: current event.
1086 *
1087 * After receiving an RR response with f-bit set to one, transmit window
1088 * size is increased by one. Returns 0 for success, 1 otherwise.
1089 */
1090int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb)
1091{
1092 struct llc_sock *llc = llc_sk(sk);
1093
1094 llc->k += 1;
David S. Miller38199822005-11-17 15:17:42 -08001095 if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO)
1096 llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 return 0;
1098}
1099
1100int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb)
1101{
1102 struct llc_sock *llc = llc_sk(sk);
1103
1104 del_timer(&llc->pf_cycle_timer.timer);
1105 del_timer(&llc->ack_timer.timer);
1106 del_timer(&llc->rej_sent_timer.timer);
1107 del_timer(&llc->busy_state_timer.timer);
1108 llc->ack_must_be_send = 0;
1109 llc->ack_pf = 0;
1110 return 0;
1111}
1112
1113int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb)
1114{
1115 struct llc_sock *llc = llc_sk(sk);
1116
1117 del_timer(&llc->rej_sent_timer.timer);
1118 del_timer(&llc->pf_cycle_timer.timer);
1119 del_timer(&llc->busy_state_timer.timer);
1120 llc->ack_must_be_send = 0;
1121 llc->ack_pf = 0;
1122 return 0;
1123}
1124
1125int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
1126{
1127 struct llc_sock *llc = llc_sk(sk);
1128
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001129 mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 return 0;
1131}
1132
1133int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
1134{
1135 struct llc_sock *llc = llc_sk(sk);
1136
1137 mod_timer(&llc->rej_sent_timer.timer,
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001138 jiffies + llc->rej_sent_timer.expire);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 return 0;
1140}
1141
1142int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
1143 struct sk_buff *skb)
1144{
1145 struct llc_sock *llc = llc_sk(sk);
1146
1147 if (!timer_pending(&llc->ack_timer.timer))
1148 mod_timer(&llc->ack_timer.timer,
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001149 jiffies + llc->ack_timer.expire);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 return 0;
1151}
1152
1153int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb)
1154{
1155 del_timer(&llc_sk(sk)->ack_timer.timer);
1156 return 0;
1157}
1158
1159int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb)
1160{
1161 struct llc_sock *llc = llc_sk(sk);
1162
1163 del_timer(&llc->pf_cycle_timer.timer);
1164 llc_conn_set_p_flag(sk, 0);
1165 return 0;
1166}
1167
1168int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb)
1169{
1170 del_timer(&llc_sk(sk)->rej_sent_timer.timer);
1171 return 0;
1172}
1173
1174int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
1175{
1176 int acked;
1177 u16 unacked = 0;
1178 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1179 struct llc_sock *llc = llc_sk(sk);
1180
1181 llc->last_nr = PDU_SUPV_GET_Nr(pdu);
1182 acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked);
1183 /* On loopback we don't queue I frames in unack_pdu_q queue. */
1184 if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) {
1185 llc->retry_count = 0;
1186 del_timer(&llc->ack_timer.timer);
1187 if (llc->failed_data_req) {
1188 /* already, we did not accept data from upper layer
1189 * (tx_window full or unacceptable state). Now, we
1190 * can send data and must inform to upper layer.
1191 */
1192 llc->failed_data_req = 0;
1193 llc_conn_ac_data_confirm(sk, skb);
1194 }
1195 if (unacked)
1196 mod_timer(&llc->ack_timer.timer,
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001197 jiffies + llc->ack_timer.expire);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 } else if (llc->failed_data_req) {
1199 u8 f_bit;
1200
1201 llc_pdu_decode_pf_bit(skb, &f_bit);
1202 if (f_bit == 1) {
1203 llc->failed_data_req = 0;
1204 llc_conn_ac_data_confirm(sk, skb);
1205 }
1206 }
1207 return 0;
1208}
1209
1210int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb)
1211{
1212 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1213
1214 if (LLC_PDU_IS_RSP(pdu)) {
1215 u8 f_bit;
1216
1217 llc_pdu_decode_pf_bit(skb, &f_bit);
1218 if (f_bit) {
1219 llc_conn_set_p_flag(sk, 0);
1220 llc_conn_ac_stop_p_timer(sk, skb);
1221 }
1222 }
1223 return 0;
1224}
1225
1226int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb)
1227{
1228 llc_sk(sk)->data_flag = 2;
1229 return 0;
1230}
1231
1232int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb)
1233{
1234 llc_sk(sk)->data_flag = 0;
1235 return 0;
1236}
1237
1238int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb)
1239{
1240 llc_sk(sk)->data_flag = 1;
1241 return 0;
1242}
1243
1244int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk,
1245 struct sk_buff *skb)
1246{
1247 if (!llc_sk(sk)->data_flag)
1248 llc_sk(sk)->data_flag = 1;
1249 return 0;
1250}
1251
1252int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb)
1253{
1254 llc_conn_set_p_flag(sk, 0);
1255 return 0;
1256}
1257
1258static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb)
1259{
1260 llc_conn_set_p_flag(sk, 1);
1261 return 0;
1262}
1263
1264int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb)
1265{
1266 llc_sk(sk)->remote_busy_flag = 0;
1267 return 0;
1268}
1269
1270int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb)
1271{
1272 llc_sk(sk)->cause_flag = 0;
1273 return 0;
1274}
1275
1276int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb)
1277{
1278 llc_sk(sk)->cause_flag = 1;
1279 return 0;
1280}
1281
1282int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb)
1283{
1284 llc_sk(sk)->retry_count = 0;
1285 return 0;
1286}
1287
1288int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb)
1289{
1290 llc_sk(sk)->retry_count++;
1291 return 0;
1292}
1293
1294int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb)
1295{
1296 llc_sk(sk)->vR = 0;
1297 return 0;
1298}
1299
1300int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb)
1301{
1302 llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR);
1303 return 0;
1304}
1305
1306int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb)
1307{
1308 llc_sk(sk)->vS = 0;
1309 return 0;
1310}
1311
1312int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
1313{
1314 llc_sk(sk)->vS = llc_sk(sk)->last_nr;
1315 return 0;
1316}
1317
Arnaldo Carvalho de Melo2928c192005-09-22 05:14:33 -03001318static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319{
Jochen Friedrich59c61962005-11-14 21:57:15 -08001320 llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 return 0;
1322}
1323
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001324static void llc_conn_tmr_common_cb(struct sock *sk, u8 type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
1327
1328 bh_lock_sock(sk);
1329 if (skb) {
1330 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
1331
Arnaldo Carvalho de Melo04e42232005-09-22 04:40:59 -03001332 skb_set_owner_r(skb, sk);
Arnaldo Carvalho de Meloe0dd5512005-09-22 03:50:15 -03001333 ev->type = type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 llc_process_tmr_ev(sk, skb);
1335 }
1336 bh_unlock_sock(sk);
1337}
1338
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001339void llc_conn_pf_cycle_tmr_cb(struct timer_list *t)
Arnaldo Carvalho de Meloe0dd5512005-09-22 03:50:15 -03001340{
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001341 struct llc_sock *llc = from_timer(llc, t, pf_cycle_timer.timer);
1342
1343 llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_P_TMR);
Arnaldo Carvalho de Meloe0dd5512005-09-22 03:50:15 -03001344}
1345
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001346void llc_conn_busy_tmr_cb(struct timer_list *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347{
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001348 struct llc_sock *llc = from_timer(llc, t, busy_state_timer.timer);
1349
1350 llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_BUSY_TMR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351}
1352
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001353void llc_conn_ack_tmr_cb(struct timer_list *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001355 struct llc_sock *llc = from_timer(llc, t, ack_timer.timer);
1356
1357 llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_ACK_TMR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358}
1359
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001360void llc_conn_rej_tmr_cb(struct timer_list *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361{
Kees Cookfc8bcaa2017-10-24 01:45:48 -07001362 struct llc_sock *llc = from_timer(llc, t, rej_sent_timer.timer);
1363
1364 llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_REJ_TMR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365}
1366
1367int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
1368{
1369 llc_sk(sk)->X = llc_sk(sk)->vS;
1370 llc_conn_ac_set_vs_nr(sk, skb);
1371 return 0;
1372}
1373
1374int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
1375{
1376 struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
1377 u8 nr = PDU_SUPV_GET_Nr(pdu);
1378
1379 if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X))
1380 llc_conn_ac_set_vs_nr(sk, skb);
1381 return 0;
1382}
1383
1384/*
1385 * Non-standard actions; these not contained in IEEE specification; for
1386 * our own usage
1387 */
1388/**
1389 * llc_conn_disc - removes connection from SAP list and frees it
1390 * @sk: closed connection
1391 * @skb: occurred event
1392 */
1393int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
1394{
1395 /* FIXME: this thing seems to want to die */
1396 return 0;
1397}
1398
1399/**
1400 * llc_conn_reset - resets connection
1401 * @sk : reseting connection.
1402 * @skb: occurred event.
1403 *
1404 * Stop all timers, empty all queues and reset all flags.
1405 */
1406int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
1407{
1408 llc_sk_reset(sk);
1409 return 0;
1410}
1411
1412/**
1413 * llc_circular_between - designates that b is between a and c or not
1414 * @a: lower bound
1415 * @b: element to see if is between a and b
1416 * @c: upper bound
1417 *
1418 * This function designates that b is between a and c or not (for example,
1419 * 0 is between 127 and 1). Returns 1 if b is between a and c, 0
1420 * otherwise.
1421 */
1422u8 llc_circular_between(u8 a, u8 b, u8 c)
1423{
1424 b = b - a;
1425 c = c - a;
1426 return b <= c;
1427}
1428
1429/**
1430 * llc_process_tmr_ev - timer backend
1431 * @sk: active connection
1432 * @skb: occurred event
1433 *
1434 * This function is called from timer callback functions. When connection
1435 * is busy (during sending a data frame) timer expiration event must be
1436 * queued. Otherwise this event can be sent to connection state machine.
1437 * Queued events will process by llc_backlog_rcv function after sending
1438 * data frame.
1439 */
1440static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
1441{
1442 if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
1443 printk(KERN_WARNING "%s: timer called on closed connection\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08001444 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 kfree_skb(skb);
1446 } else {
1447 if (!sock_owned_by_user(sk))
1448 llc_conn_state_process(sk, skb);
1449 else {
1450 llc_set_backlog_type(skb, LLC_EVENT);
Zhu Yia3a858f2010-03-04 18:01:47 +00001451 __sk_add_backlog(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 }
1453 }
1454}