Root/
1 | /* |
2 | * llc_c_ac.c - actions performed during connection state transition. |
3 | * |
4 | * Description: |
5 | * Functions in this module are implementation of connection component actions |
6 | * Details of actions can be found in IEEE-802.2 standard document. |
7 | * All functions have one connection and one event as input argument. All of |
8 | * them return 0 On success and 1 otherwise. |
9 | * |
10 | * Copyright (c) 1997 by Procom Technology, Inc. |
11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
12 | * |
13 | * This program can be redistributed or modified under the terms of the |
14 | * GNU General Public License as published by the Free Software Foundation. |
15 | * This program is distributed without any warranty or implied warranty |
16 | * of merchantability or fitness for a particular purpose. |
17 | * |
18 | * See the GNU General Public License for more details. |
19 | */ |
20 | #include <linux/netdevice.h> |
21 | #include <linux/slab.h> |
22 | #include <net/llc_conn.h> |
23 | #include <net/llc_sap.h> |
24 | #include <net/sock.h> |
25 | #include <net/llc_c_ev.h> |
26 | #include <net/llc_c_ac.h> |
27 | #include <net/llc_c_st.h> |
28 | #include <net/llc_pdu.h> |
29 | #include <net/llc.h> |
30 | |
31 | |
32 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); |
33 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); |
34 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); |
35 | |
36 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); |
37 | |
38 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, |
39 | struct sk_buff *skb); |
40 | |
41 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); |
42 | |
43 | #define INCORRECT 0 |
44 | |
45 | int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) |
46 | { |
47 | struct llc_sock *llc = llc_sk(sk); |
48 | |
49 | if (llc->remote_busy_flag) { |
50 | u8 nr; |
51 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
52 | |
53 | llc->remote_busy_flag = 0; |
54 | del_timer(&llc->busy_state_timer.timer); |
55 | nr = LLC_I_GET_NR(pdu); |
56 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
57 | } |
58 | return 0; |
59 | } |
60 | |
61 | int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) |
62 | { |
63 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
64 | |
65 | ev->ind_prim = LLC_CONN_PRIM; |
66 | return 0; |
67 | } |
68 | |
69 | int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) |
70 | { |
71 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
72 | |
73 | ev->cfm_prim = LLC_CONN_PRIM; |
74 | return 0; |
75 | } |
76 | |
77 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) |
78 | { |
79 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
80 | |
81 | ev->cfm_prim = LLC_DATA_PRIM; |
82 | return 0; |
83 | } |
84 | |
85 | int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) |
86 | { |
87 | llc_conn_rtn_pdu(sk, skb); |
88 | return 0; |
89 | } |
90 | |
91 | int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) |
92 | { |
93 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
94 | u8 reason = 0; |
95 | int rc = 0; |
96 | |
97 | if (ev->type == LLC_CONN_EV_TYPE_PDU) { |
98 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
99 | |
100 | if (LLC_PDU_IS_RSP(pdu) && |
101 | LLC_PDU_TYPE_IS_U(pdu) && |
102 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) |
103 | reason = LLC_DISC_REASON_RX_DM_RSP_PDU; |
104 | else if (LLC_PDU_IS_CMD(pdu) && |
105 | LLC_PDU_TYPE_IS_U(pdu) && |
106 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) |
107 | reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; |
108 | } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) |
109 | reason = LLC_DISC_REASON_ACK_TMR_EXP; |
110 | else |
111 | rc = -EINVAL; |
112 | if (!rc) { |
113 | ev->reason = reason; |
114 | ev->ind_prim = LLC_DISC_PRIM; |
115 | } |
116 | return rc; |
117 | } |
118 | |
119 | int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) |
120 | { |
121 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
122 | |
123 | ev->reason = ev->status; |
124 | ev->cfm_prim = LLC_DISC_PRIM; |
125 | return 0; |
126 | } |
127 | |
128 | int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) |
129 | { |
130 | u8 reason = 0; |
131 | int rc = 1; |
132 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
133 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
134 | struct llc_sock *llc = llc_sk(sk); |
135 | |
136 | switch (ev->type) { |
137 | case LLC_CONN_EV_TYPE_PDU: |
138 | if (LLC_PDU_IS_RSP(pdu) && |
139 | LLC_PDU_TYPE_IS_U(pdu) && |
140 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { |
141 | reason = LLC_RESET_REASON_LOCAL; |
142 | rc = 0; |
143 | } else if (LLC_PDU_IS_CMD(pdu) && |
144 | LLC_PDU_TYPE_IS_U(pdu) && |
145 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { |
146 | reason = LLC_RESET_REASON_REMOTE; |
147 | rc = 0; |
148 | } |
149 | break; |
150 | case LLC_CONN_EV_TYPE_ACK_TMR: |
151 | case LLC_CONN_EV_TYPE_P_TMR: |
152 | case LLC_CONN_EV_TYPE_REJ_TMR: |
153 | case LLC_CONN_EV_TYPE_BUSY_TMR: |
154 | if (llc->retry_count > llc->n2) { |
155 | reason = LLC_RESET_REASON_LOCAL; |
156 | rc = 0; |
157 | } |
158 | break; |
159 | } |
160 | if (!rc) { |
161 | ev->reason = reason; |
162 | ev->ind_prim = LLC_RESET_PRIM; |
163 | } |
164 | return rc; |
165 | } |
166 | |
167 | int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) |
168 | { |
169 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
170 | |
171 | ev->reason = 0; |
172 | ev->cfm_prim = LLC_RESET_PRIM; |
173 | return 0; |
174 | } |
175 | |
176 | int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, |
177 | struct sk_buff *skb) |
178 | { |
179 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
180 | |
181 | if (LLC_PDU_IS_RSP(pdu) && |
182 | LLC_PDU_TYPE_IS_I(pdu) && |
183 | LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf) |
184 | llc_conn_ac_clear_remote_busy(sk, skb); |
185 | return 0; |
186 | } |
187 | |
188 | int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, |
189 | struct sk_buff *skb) |
190 | { |
191 | struct llc_sock *llc = llc_sk(sk); |
192 | |
193 | if (llc->data_flag == 2) |
194 | del_timer(&llc->rej_sent_timer.timer); |
195 | return 0; |
196 | } |
197 | |
198 | int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) |
199 | { |
200 | int rc = -ENOBUFS; |
201 | struct llc_sock *llc = llc_sk(sk); |
202 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
203 | |
204 | if (nskb) { |
205 | struct llc_sap *sap = llc->sap; |
206 | |
207 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
208 | llc->daddr.lsap, LLC_PDU_CMD); |
209 | llc_pdu_init_as_disc_cmd(nskb, 1); |
210 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
211 | if (unlikely(rc)) |
212 | goto free; |
213 | llc_conn_send_pdu(sk, nskb); |
214 | llc_conn_ac_set_p_flag_1(sk, skb); |
215 | } |
216 | out: |
217 | return rc; |
218 | free: |
219 | kfree_skb(nskb); |
220 | goto out; |
221 | } |
222 | |
223 | int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) |
224 | { |
225 | int rc = -ENOBUFS; |
226 | struct llc_sock *llc = llc_sk(sk); |
227 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
228 | |
229 | if (nskb) { |
230 | struct llc_sap *sap = llc->sap; |
231 | u8 f_bit; |
232 | |
233 | llc_pdu_decode_pf_bit(skb, &f_bit); |
234 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
235 | llc->daddr.lsap, LLC_PDU_RSP); |
236 | llc_pdu_init_as_dm_rsp(nskb, f_bit); |
237 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
238 | if (unlikely(rc)) |
239 | goto free; |
240 | llc_conn_send_pdu(sk, nskb); |
241 | } |
242 | out: |
243 | return rc; |
244 | free: |
245 | kfree_skb(nskb); |
246 | goto out; |
247 | } |
248 | |
249 | int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
250 | { |
251 | int rc = -ENOBUFS; |
252 | struct llc_sock *llc = llc_sk(sk); |
253 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
254 | |
255 | if (nskb) { |
256 | struct llc_sap *sap = llc->sap; |
257 | |
258 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
259 | llc->daddr.lsap, LLC_PDU_RSP); |
260 | llc_pdu_init_as_dm_rsp(nskb, 1); |
261 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
262 | if (unlikely(rc)) |
263 | goto free; |
264 | llc_conn_send_pdu(sk, nskb); |
265 | } |
266 | out: |
267 | return rc; |
268 | free: |
269 | kfree_skb(nskb); |
270 | goto out; |
271 | } |
272 | |
273 | int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) |
274 | { |
275 | u8 f_bit; |
276 | int rc = -ENOBUFS; |
277 | struct sk_buff *nskb; |
278 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
279 | struct llc_sock *llc = llc_sk(sk); |
280 | |
281 | llc->rx_pdu_hdr = *((u32 *)pdu); |
282 | if (LLC_PDU_IS_CMD(pdu)) |
283 | llc_pdu_decode_pf_bit(skb, &f_bit); |
284 | else |
285 | f_bit = 0; |
286 | nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
287 | sizeof(struct llc_frmr_info)); |
288 | if (nskb) { |
289 | struct llc_sap *sap = llc->sap; |
290 | |
291 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
292 | llc->daddr.lsap, LLC_PDU_RSP); |
293 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, |
294 | llc->vR, INCORRECT); |
295 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
296 | if (unlikely(rc)) |
297 | goto free; |
298 | llc_conn_send_pdu(sk, nskb); |
299 | } |
300 | out: |
301 | return rc; |
302 | free: |
303 | kfree_skb(nskb); |
304 | goto out; |
305 | } |
306 | |
307 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) |
308 | { |
309 | int rc = -ENOBUFS; |
310 | struct llc_sock *llc = llc_sk(sk); |
311 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
312 | sizeof(struct llc_frmr_info)); |
313 | |
314 | if (nskb) { |
315 | struct llc_sap *sap = llc->sap; |
316 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; |
317 | |
318 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
319 | llc->daddr.lsap, LLC_PDU_RSP); |
320 | llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, |
321 | llc->vR, INCORRECT); |
322 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
323 | if (unlikely(rc)) |
324 | goto free; |
325 | llc_conn_send_pdu(sk, nskb); |
326 | } |
327 | out: |
328 | return rc; |
329 | free: |
330 | kfree_skb(nskb); |
331 | goto out; |
332 | } |
333 | |
334 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) |
335 | { |
336 | u8 f_bit; |
337 | int rc = -ENOBUFS; |
338 | struct sk_buff *nskb; |
339 | struct llc_sock *llc = llc_sk(sk); |
340 | |
341 | llc_pdu_decode_pf_bit(skb, &f_bit); |
342 | nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, |
343 | sizeof(struct llc_frmr_info)); |
344 | if (nskb) { |
345 | struct llc_sap *sap = llc->sap; |
346 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
347 | |
348 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
349 | llc->daddr.lsap, LLC_PDU_RSP); |
350 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, |
351 | llc->vR, INCORRECT); |
352 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
353 | if (unlikely(rc)) |
354 | goto free; |
355 | llc_conn_send_pdu(sk, nskb); |
356 | } |
357 | out: |
358 | return rc; |
359 | free: |
360 | kfree_skb(nskb); |
361 | goto out; |
362 | } |
363 | |
364 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
365 | { |
366 | int rc; |
367 | struct llc_sock *llc = llc_sk(sk); |
368 | struct llc_sap *sap = llc->sap; |
369 | |
370 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
371 | llc->daddr.lsap, LLC_PDU_CMD); |
372 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); |
373 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
374 | if (likely(!rc)) { |
375 | llc_conn_send_pdu(sk, skb); |
376 | llc_conn_ac_inc_vs_by_1(sk, skb); |
377 | } |
378 | return rc; |
379 | } |
380 | |
381 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) |
382 | { |
383 | int rc; |
384 | struct llc_sock *llc = llc_sk(sk); |
385 | struct llc_sap *sap = llc->sap; |
386 | |
387 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
388 | llc->daddr.lsap, LLC_PDU_CMD); |
389 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); |
390 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
391 | if (likely(!rc)) { |
392 | llc_conn_send_pdu(sk, skb); |
393 | llc_conn_ac_inc_vs_by_1(sk, skb); |
394 | } |
395 | return rc; |
396 | } |
397 | |
398 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
399 | { |
400 | int rc; |
401 | struct llc_sock *llc = llc_sk(sk); |
402 | struct llc_sap *sap = llc->sap; |
403 | |
404 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
405 | llc->daddr.lsap, LLC_PDU_CMD); |
406 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); |
407 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
408 | if (likely(!rc)) { |
409 | llc_conn_send_pdu(sk, skb); |
410 | llc_conn_ac_inc_vs_by_1(sk, skb); |
411 | } |
412 | return 0; |
413 | } |
414 | |
415 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
416 | { |
417 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
418 | u8 nr = LLC_I_GET_NR(pdu); |
419 | |
420 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
421 | return 0; |
422 | } |
423 | |
424 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, |
425 | struct sk_buff *skb) |
426 | { |
427 | u8 nr; |
428 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
429 | int rc = -ENOBUFS; |
430 | struct llc_sock *llc = llc_sk(sk); |
431 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
432 | |
433 | if (nskb) { |
434 | struct llc_sap *sap = llc->sap; |
435 | |
436 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
437 | llc->daddr.lsap, LLC_PDU_RSP); |
438 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); |
439 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
440 | if (likely(!rc)) |
441 | llc_conn_send_pdu(sk, nskb); |
442 | else |
443 | kfree_skb(skb); |
444 | } |
445 | if (rc) { |
446 | nr = LLC_I_GET_NR(pdu); |
447 | rc = 0; |
448 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); |
449 | } |
450 | return rc; |
451 | } |
452 | |
453 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
454 | { |
455 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
456 | u8 nr = LLC_I_GET_NR(pdu); |
457 | |
458 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); |
459 | return 0; |
460 | } |
461 | |
462 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
463 | { |
464 | int rc = -ENOBUFS; |
465 | struct llc_sock *llc = llc_sk(sk); |
466 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
467 | |
468 | if (nskb) { |
469 | struct llc_sap *sap = llc->sap; |
470 | |
471 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
472 | llc->daddr.lsap, LLC_PDU_CMD); |
473 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); |
474 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
475 | if (unlikely(rc)) |
476 | goto free; |
477 | llc_conn_send_pdu(sk, nskb); |
478 | } |
479 | out: |
480 | return rc; |
481 | free: |
482 | kfree_skb(nskb); |
483 | goto out; |
484 | } |
485 | |
486 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
487 | { |
488 | int rc = -ENOBUFS; |
489 | struct llc_sock *llc = llc_sk(sk); |
490 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
491 | |
492 | if (nskb) { |
493 | struct llc_sap *sap = llc->sap; |
494 | |
495 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
496 | llc->daddr.lsap, LLC_PDU_RSP); |
497 | llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); |
498 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
499 | if (unlikely(rc)) |
500 | goto free; |
501 | llc_conn_send_pdu(sk, nskb); |
502 | } |
503 | out: |
504 | return rc; |
505 | free: |
506 | kfree_skb(nskb); |
507 | goto out; |
508 | } |
509 | |
510 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
511 | { |
512 | int rc = -ENOBUFS; |
513 | struct llc_sock *llc = llc_sk(sk); |
514 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
515 | |
516 | if (nskb) { |
517 | struct llc_sap *sap = llc->sap; |
518 | |
519 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
520 | llc->daddr.lsap, LLC_PDU_RSP); |
521 | llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); |
522 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
523 | if (unlikely(rc)) |
524 | goto free; |
525 | llc_conn_send_pdu(sk, nskb); |
526 | } |
527 | out: |
528 | return rc; |
529 | free: |
530 | kfree_skb(nskb); |
531 | goto out; |
532 | } |
533 | |
534 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
535 | { |
536 | int rc = -ENOBUFS; |
537 | struct llc_sock *llc = llc_sk(sk); |
538 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
539 | |
540 | if (nskb) { |
541 | struct llc_sap *sap = llc->sap; |
542 | |
543 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
544 | llc->daddr.lsap, LLC_PDU_CMD); |
545 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); |
546 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
547 | if (unlikely(rc)) |
548 | goto free; |
549 | llc_conn_send_pdu(sk, nskb); |
550 | } |
551 | out: |
552 | return rc; |
553 | free: |
554 | kfree_skb(nskb); |
555 | goto out; |
556 | } |
557 | |
558 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
559 | { |
560 | int rc = -ENOBUFS; |
561 | struct llc_sock *llc = llc_sk(sk); |
562 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
563 | |
564 | if (nskb) { |
565 | struct llc_sap *sap = llc->sap; |
566 | |
567 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
568 | llc->daddr.lsap, LLC_PDU_RSP); |
569 | llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); |
570 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
571 | if (unlikely(rc)) |
572 | goto free; |
573 | llc_conn_send_pdu(sk, nskb); |
574 | } |
575 | out: |
576 | return rc; |
577 | free: |
578 | kfree_skb(nskb); |
579 | goto out; |
580 | } |
581 | |
582 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
583 | { |
584 | int rc = -ENOBUFS; |
585 | struct llc_sock *llc = llc_sk(sk); |
586 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
587 | |
588 | if (nskb) { |
589 | struct llc_sap *sap = llc->sap; |
590 | |
591 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
592 | llc->daddr.lsap, LLC_PDU_RSP); |
593 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
594 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
595 | if (unlikely(rc)) |
596 | goto free; |
597 | llc_conn_send_pdu(sk, nskb); |
598 | } |
599 | out: |
600 | return rc; |
601 | free: |
602 | kfree_skb(nskb); |
603 | goto out; |
604 | } |
605 | |
606 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) |
607 | { |
608 | struct llc_sock *llc = llc_sk(sk); |
609 | |
610 | if (!llc->remote_busy_flag) { |
611 | llc->remote_busy_flag = 1; |
612 | mod_timer(&llc->busy_state_timer.timer, |
613 | jiffies + llc->busy_state_timer.expire); |
614 | } |
615 | return 0; |
616 | } |
617 | |
618 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
619 | { |
620 | int rc = -ENOBUFS; |
621 | struct llc_sock *llc = llc_sk(sk); |
622 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
623 | |
624 | if (nskb) { |
625 | struct llc_sap *sap = llc->sap; |
626 | |
627 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
628 | llc->daddr.lsap, LLC_PDU_RSP); |
629 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); |
630 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
631 | if (unlikely(rc)) |
632 | goto free; |
633 | llc_conn_send_pdu(sk, nskb); |
634 | } |
635 | out: |
636 | return rc; |
637 | free: |
638 | kfree_skb(nskb); |
639 | goto out; |
640 | } |
641 | |
642 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) |
643 | { |
644 | int rc = -ENOBUFS; |
645 | struct llc_sock *llc = llc_sk(sk); |
646 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
647 | |
648 | if (nskb) { |
649 | struct llc_sap *sap = llc->sap; |
650 | |
651 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
652 | llc->daddr.lsap, LLC_PDU_CMD); |
653 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); |
654 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
655 | if (unlikely(rc)) |
656 | goto free; |
657 | llc_conn_send_pdu(sk, nskb); |
658 | } |
659 | out: |
660 | return rc; |
661 | free: |
662 | kfree_skb(nskb); |
663 | goto out; |
664 | } |
665 | |
666 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
667 | { |
668 | int rc = -ENOBUFS; |
669 | struct llc_sock *llc = llc_sk(sk); |
670 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
671 | |
672 | if (nskb) { |
673 | struct llc_sap *sap = llc->sap; |
674 | u8 f_bit = 1; |
675 | |
676 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
677 | llc->daddr.lsap, LLC_PDU_RSP); |
678 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); |
679 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
680 | if (unlikely(rc)) |
681 | goto free; |
682 | llc_conn_send_pdu(sk, nskb); |
683 | } |
684 | out: |
685 | return rc; |
686 | free: |
687 | kfree_skb(nskb); |
688 | goto out; |
689 | } |
690 | |
691 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) |
692 | { |
693 | int rc = -ENOBUFS; |
694 | struct llc_sock *llc = llc_sk(sk); |
695 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
696 | |
697 | if (nskb) { |
698 | struct llc_sap *sap = llc->sap; |
699 | |
700 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
701 | llc->daddr.lsap, LLC_PDU_RSP); |
702 | llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); |
703 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
704 | if (unlikely(rc)) |
705 | goto free; |
706 | llc_conn_send_pdu(sk, nskb); |
707 | } |
708 | out: |
709 | return rc; |
710 | free: |
711 | kfree_skb(nskb); |
712 | goto out; |
713 | } |
714 | |
715 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
716 | { |
717 | int rc = -ENOBUFS; |
718 | struct llc_sock *llc = llc_sk(sk); |
719 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
720 | |
721 | if (nskb) { |
722 | struct llc_sap *sap = llc->sap; |
723 | |
724 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
725 | llc->daddr.lsap, LLC_PDU_RSP); |
726 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); |
727 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
728 | if (unlikely(rc)) |
729 | goto free; |
730 | llc_conn_send_pdu(sk, nskb); |
731 | } |
732 | out: |
733 | return rc; |
734 | free: |
735 | kfree_skb(nskb); |
736 | goto out; |
737 | } |
738 | |
739 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) |
740 | { |
741 | int rc = -ENOBUFS; |
742 | struct llc_sock *llc = llc_sk(sk); |
743 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
744 | |
745 | if (nskb) { |
746 | struct llc_sap *sap = llc->sap; |
747 | |
748 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
749 | llc->daddr.lsap, LLC_PDU_RSP); |
750 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); |
751 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
752 | if (unlikely(rc)) |
753 | goto free; |
754 | llc_conn_send_pdu(sk, nskb); |
755 | } |
756 | out: |
757 | return rc; |
758 | free: |
759 | kfree_skb(nskb); |
760 | goto out; |
761 | } |
762 | |
763 | void llc_conn_set_p_flag(struct sock *sk, u8 value) |
764 | { |
765 | int state_changed = llc_sk(sk)->p_flag && !value; |
766 | |
767 | llc_sk(sk)->p_flag = value; |
768 | |
769 | if (state_changed) |
770 | sk->sk_state_change(sk); |
771 | } |
772 | |
773 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) |
774 | { |
775 | int rc = -ENOBUFS; |
776 | struct llc_sock *llc = llc_sk(sk); |
777 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
778 | |
779 | if (nskb) { |
780 | struct llc_sap *sap = llc->sap; |
781 | u8 *dmac = llc->daddr.mac; |
782 | |
783 | if (llc->dev->flags & IFF_LOOPBACK) |
784 | dmac = llc->dev->dev_addr; |
785 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
786 | llc->daddr.lsap, LLC_PDU_CMD); |
787 | llc_pdu_init_as_sabme_cmd(nskb, 1); |
788 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); |
789 | if (unlikely(rc)) |
790 | goto free; |
791 | llc_conn_send_pdu(sk, nskb); |
792 | llc_conn_set_p_flag(sk, 1); |
793 | } |
794 | out: |
795 | return rc; |
796 | free: |
797 | kfree_skb(nskb); |
798 | goto out; |
799 | } |
800 | |
801 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) |
802 | { |
803 | u8 f_bit; |
804 | int rc = -ENOBUFS; |
805 | struct llc_sock *llc = llc_sk(sk); |
806 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); |
807 | |
808 | llc_pdu_decode_pf_bit(skb, &f_bit); |
809 | if (nskb) { |
810 | struct llc_sap *sap = llc->sap; |
811 | |
812 | nskb->dev = llc->dev; |
813 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, |
814 | llc->daddr.lsap, LLC_PDU_RSP); |
815 | llc_pdu_init_as_ua_rsp(nskb, f_bit); |
816 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
817 | if (unlikely(rc)) |
818 | goto free; |
819 | llc_conn_send_pdu(sk, nskb); |
820 | } |
821 | out: |
822 | return rc; |
823 | free: |
824 | kfree_skb(nskb); |
825 | goto out; |
826 | } |
827 | |
828 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) |
829 | { |
830 | llc_sk(sk)->s_flag = 0; |
831 | return 0; |
832 | } |
833 | |
834 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) |
835 | { |
836 | llc_sk(sk)->s_flag = 1; |
837 | return 0; |
838 | } |
839 | |
840 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) |
841 | { |
842 | struct llc_sock *llc = llc_sk(sk); |
843 | |
844 | llc_conn_set_p_flag(sk, 1); |
845 | mod_timer(&llc->pf_cycle_timer.timer, |
846 | jiffies + llc->pf_cycle_timer.expire); |
847 | return 0; |
848 | } |
849 | |
850 | /** |
851 | * llc_conn_ac_send_ack_if_needed - check if ack is needed |
852 | * @sk: current connection structure |
853 | * @skb: current event |
854 | * |
855 | * Checks number of received PDUs which have not been acknowledged, yet, |
856 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then |
857 | * sends an RR response as acknowledgement for them. Returns 0 for |
858 | * success, 1 otherwise. |
859 | */ |
860 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) |
861 | { |
862 | u8 pf_bit; |
863 | struct llc_sock *llc = llc_sk(sk); |
864 | |
865 | llc_pdu_decode_pf_bit(skb, &pf_bit); |
866 | llc->ack_pf |= pf_bit & 1; |
867 | if (!llc->ack_must_be_send) { |
868 | llc->first_pdu_Ns = llc->vR; |
869 | llc->ack_must_be_send = 1; |
870 | llc->ack_pf = pf_bit & 1; |
871 | } |
872 | if (((llc->vR - llc->first_pdu_Ns + 1 + LLC_2_SEQ_NBR_MODULO) |
873 | % LLC_2_SEQ_NBR_MODULO) >= llc->npta) { |
874 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); |
875 | llc->ack_must_be_send = 0; |
876 | llc->ack_pf = 0; |
877 | llc_conn_ac_inc_npta_value(sk, skb); |
878 | } |
879 | return 0; |
880 | } |
881 | |
882 | /** |
883 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag |
884 | * @sk: current connection structure |
885 | * @skb: current event |
886 | * |
887 | * This action resets ack_must_be_send flag of given connection, this flag |
888 | * indicates if there is any PDU which has not been acknowledged yet. |
889 | * Returns 0 for success, 1 otherwise. |
890 | */ |
891 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) |
892 | { |
893 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; |
894 | return 0; |
895 | } |
896 | |
897 | /** |
898 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs |
899 | * @sk: current connection structure |
900 | * @skb: current event |
901 | * |
902 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to |
903 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is |
904 | * set to one if one PDU with p-bit set to one is received. Returns 0 for |
905 | * success, 1 otherwise. |
906 | */ |
907 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, |
908 | struct sk_buff *skb) |
909 | { |
910 | int rc; |
911 | struct llc_sock *llc = llc_sk(sk); |
912 | struct llc_sap *sap = llc->sap; |
913 | |
914 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, |
915 | llc->daddr.lsap, LLC_PDU_RSP); |
916 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); |
917 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); |
918 | if (likely(!rc)) { |
919 | llc_conn_send_pdu(sk, skb); |
920 | llc_conn_ac_inc_vs_by_1(sk, skb); |
921 | } |
922 | return rc; |
923 | } |
924 | |
925 | /** |
926 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs |
927 | * @sk: current connection structure. |
928 | * @skb: current event. |
929 | * |
930 | * This action sends an I-format PDU as acknowledge to received PDUs which |
931 | * have not been acknowledged, yet, if there is any. By using of this |
932 | * action number of acknowledgements decreases, this technic is called |
933 | * piggy backing. Returns 0 for success, 1 otherwise. |
934 | */ |
935 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) |
936 | { |
937 | struct llc_sock *llc = llc_sk(sk); |
938 | |
939 | if (llc->ack_must_be_send) { |
940 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); |
941 | llc->ack_must_be_send = 0 ; |
942 | llc->ack_pf = 0; |
943 | } else |
944 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); |
945 | return 0; |
946 | } |
947 | |
948 | /** |
949 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked |
950 | * @sk: current connection structure. |
951 | * @skb: current event. |
952 | * |
953 | * This action sends an RR response with f-bit set to ack_pf flag as |
954 | * acknowledge to all received PDUs which have not been acknowledged, yet, |
955 | * if there is any. ack_pf flag indicates if a PDU has been received with |
956 | * p-bit set to one. Returns 0 for success, 1 otherwise. |
957 | */ |
958 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, |
959 | struct sk_buff *skb) |
960 | { |
961 | int rc = -ENOBUFS; |
962 | struct llc_sock *llc = llc_sk(sk); |
963 | struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); |
964 | |
965 | if (nskb) { |
966 | struct llc_sap *sap = llc->sap; |
967 | |
968 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, |
969 | llc->daddr.lsap, LLC_PDU_RSP); |
970 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); |
971 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); |
972 | if (unlikely(rc)) |
973 | goto free; |
974 | llc_conn_send_pdu(sk, nskb); |
975 | } |
976 | out: |
977 | return rc; |
978 | free: |
979 | kfree_skb(nskb); |
980 | goto out; |
981 | } |
982 | |
983 | /** |
984 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater |
985 | * @sk: current connection structure. |
986 | * @skb: current event. |
987 | * |
988 | * After "inc_cntr" times calling of this action, "npta" increase by one. |
989 | * this action tries to make vale of "npta" greater as possible; number of |
990 | * acknowledgements decreases by increasing of "npta". Returns 0 for |
991 | * success, 1 otherwise. |
992 | */ |
993 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) |
994 | { |
995 | struct llc_sock *llc = llc_sk(sk); |
996 | |
997 | if (!llc->inc_cntr) { |
998 | llc->dec_step = 0; |
999 | llc->dec_cntr = llc->inc_cntr = 2; |
1000 | ++llc->npta; |
1001 | if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1002 | llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; |
1003 | } else |
1004 | --llc->inc_cntr; |
1005 | return 0; |
1006 | } |
1007 | |
1008 | /** |
1009 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one |
1010 | * @sk: current connection structure. |
1011 | * @skb: current event. |
1012 | * |
1013 | * After receiving "dec_cntr" times RR command, this action decreases |
1014 | * "npta" by one. Returns 0 for success, 1 otherwise. |
1015 | */ |
1016 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) |
1017 | { |
1018 | struct llc_sock *llc = llc_sk(sk); |
1019 | |
1020 | if (!llc->connect_step && !llc->remote_busy_flag) { |
1021 | if (!llc->dec_step) { |
1022 | if (!llc->dec_cntr) { |
1023 | llc->inc_cntr = llc->dec_cntr = 2; |
1024 | if (llc->npta > 0) |
1025 | llc->npta = llc->npta - 1; |
1026 | } else |
1027 | llc->dec_cntr -=1; |
1028 | } |
1029 | } else |
1030 | llc->connect_step = 0 ; |
1031 | return 0; |
1032 | } |
1033 | |
1034 | /** |
1035 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one |
1036 | * @sk: current connection structure. |
1037 | * @skb: current event. |
1038 | * |
1039 | * After receiving "dec_cntr" times RNR command, this action decreases |
1040 | * "npta" by one. Returns 0 for success, 1 otherwise. |
1041 | */ |
1042 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) |
1043 | { |
1044 | struct llc_sock *llc = llc_sk(sk); |
1045 | |
1046 | if (llc->remote_busy_flag) |
1047 | if (!llc->dec_step) { |
1048 | if (!llc->dec_cntr) { |
1049 | llc->inc_cntr = llc->dec_cntr = 2; |
1050 | if (llc->npta > 0) |
1051 | --llc->npta; |
1052 | } else |
1053 | --llc->dec_cntr; |
1054 | } |
1055 | return 0; |
1056 | } |
1057 | |
1058 | /** |
1059 | * llc_conn_ac_dec_tx_win_size - decreases tx window size |
1060 | * @sk: current connection structure. |
1061 | * @skb: current event. |
1062 | * |
1063 | * After receiving of a REJ command or response, transmit window size is |
1064 | * decreased by number of PDUs which are outstanding yet. Returns 0 for |
1065 | * success, 1 otherwise. |
1066 | */ |
1067 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) |
1068 | { |
1069 | struct llc_sock *llc = llc_sk(sk); |
1070 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); |
1071 | |
1072 | if (llc->k - unacked_pdu < 1) |
1073 | llc->k = 1; |
1074 | else |
1075 | llc->k -= unacked_pdu; |
1076 | return 0; |
1077 | } |
1078 | |
1079 | /** |
1080 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 |
1081 | * @sk: current connection structure. |
1082 | * @skb: current event. |
1083 | * |
1084 | * After receiving an RR response with f-bit set to one, transmit window |
1085 | * size is increased by one. Returns 0 for success, 1 otherwise. |
1086 | */ |
1087 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) |
1088 | { |
1089 | struct llc_sock *llc = llc_sk(sk); |
1090 | |
1091 | llc->k += 1; |
1092 | if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO) |
1093 | llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; |
1094 | return 0; |
1095 | } |
1096 | |
1097 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) |
1098 | { |
1099 | struct llc_sock *llc = llc_sk(sk); |
1100 | |
1101 | del_timer(&llc->pf_cycle_timer.timer); |
1102 | del_timer(&llc->ack_timer.timer); |
1103 | del_timer(&llc->rej_sent_timer.timer); |
1104 | del_timer(&llc->busy_state_timer.timer); |
1105 | llc->ack_must_be_send = 0; |
1106 | llc->ack_pf = 0; |
1107 | return 0; |
1108 | } |
1109 | |
1110 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) |
1111 | { |
1112 | struct llc_sock *llc = llc_sk(sk); |
1113 | |
1114 | del_timer(&llc->rej_sent_timer.timer); |
1115 | del_timer(&llc->pf_cycle_timer.timer); |
1116 | del_timer(&llc->busy_state_timer.timer); |
1117 | llc->ack_must_be_send = 0; |
1118 | llc->ack_pf = 0; |
1119 | return 0; |
1120 | } |
1121 | |
1122 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) |
1123 | { |
1124 | struct llc_sock *llc = llc_sk(sk); |
1125 | |
1126 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); |
1127 | return 0; |
1128 | } |
1129 | |
1130 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) |
1131 | { |
1132 | struct llc_sock *llc = llc_sk(sk); |
1133 | |
1134 | mod_timer(&llc->rej_sent_timer.timer, |
1135 | jiffies + llc->rej_sent_timer.expire); |
1136 | return 0; |
1137 | } |
1138 | |
1139 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, |
1140 | struct sk_buff *skb) |
1141 | { |
1142 | struct llc_sock *llc = llc_sk(sk); |
1143 | |
1144 | if (!timer_pending(&llc->ack_timer.timer)) |
1145 | mod_timer(&llc->ack_timer.timer, |
1146 | jiffies + llc->ack_timer.expire); |
1147 | return 0; |
1148 | } |
1149 | |
1150 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) |
1151 | { |
1152 | del_timer(&llc_sk(sk)->ack_timer.timer); |
1153 | return 0; |
1154 | } |
1155 | |
1156 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) |
1157 | { |
1158 | struct llc_sock *llc = llc_sk(sk); |
1159 | |
1160 | del_timer(&llc->pf_cycle_timer.timer); |
1161 | llc_conn_set_p_flag(sk, 0); |
1162 | return 0; |
1163 | } |
1164 | |
1165 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) |
1166 | { |
1167 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); |
1168 | return 0; |
1169 | } |
1170 | |
1171 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) |
1172 | { |
1173 | int acked; |
1174 | u16 unacked = 0; |
1175 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
1176 | struct llc_sock *llc = llc_sk(sk); |
1177 | |
1178 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); |
1179 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); |
1180 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ |
1181 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { |
1182 | llc->retry_count = 0; |
1183 | del_timer(&llc->ack_timer.timer); |
1184 | if (llc->failed_data_req) { |
1185 | /* already, we did not accept data from upper layer |
1186 | * (tx_window full or unacceptable state). Now, we |
1187 | * can send data and must inform to upper layer. |
1188 | */ |
1189 | llc->failed_data_req = 0; |
1190 | llc_conn_ac_data_confirm(sk, skb); |
1191 | } |
1192 | if (unacked) |
1193 | mod_timer(&llc->ack_timer.timer, |
1194 | jiffies + llc->ack_timer.expire); |
1195 | } else if (llc->failed_data_req) { |
1196 | u8 f_bit; |
1197 | |
1198 | llc_pdu_decode_pf_bit(skb, &f_bit); |
1199 | if (f_bit == 1) { |
1200 | llc->failed_data_req = 0; |
1201 | llc_conn_ac_data_confirm(sk, skb); |
1202 | } |
1203 | } |
1204 | return 0; |
1205 | } |
1206 | |
1207 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) |
1208 | { |
1209 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
1210 | |
1211 | if (LLC_PDU_IS_RSP(pdu)) { |
1212 | u8 f_bit; |
1213 | |
1214 | llc_pdu_decode_pf_bit(skb, &f_bit); |
1215 | if (f_bit) { |
1216 | llc_conn_set_p_flag(sk, 0); |
1217 | llc_conn_ac_stop_p_timer(sk, skb); |
1218 | } |
1219 | } |
1220 | return 0; |
1221 | } |
1222 | |
1223 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) |
1224 | { |
1225 | llc_sk(sk)->data_flag = 2; |
1226 | return 0; |
1227 | } |
1228 | |
1229 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) |
1230 | { |
1231 | llc_sk(sk)->data_flag = 0; |
1232 | return 0; |
1233 | } |
1234 | |
1235 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) |
1236 | { |
1237 | llc_sk(sk)->data_flag = 1; |
1238 | return 0; |
1239 | } |
1240 | |
1241 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, |
1242 | struct sk_buff *skb) |
1243 | { |
1244 | if (!llc_sk(sk)->data_flag) |
1245 | llc_sk(sk)->data_flag = 1; |
1246 | return 0; |
1247 | } |
1248 | |
1249 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) |
1250 | { |
1251 | llc_conn_set_p_flag(sk, 0); |
1252 | return 0; |
1253 | } |
1254 | |
1255 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) |
1256 | { |
1257 | llc_conn_set_p_flag(sk, 1); |
1258 | return 0; |
1259 | } |
1260 | |
1261 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) |
1262 | { |
1263 | llc_sk(sk)->remote_busy_flag = 0; |
1264 | return 0; |
1265 | } |
1266 | |
1267 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) |
1268 | { |
1269 | llc_sk(sk)->cause_flag = 0; |
1270 | return 0; |
1271 | } |
1272 | |
1273 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) |
1274 | { |
1275 | llc_sk(sk)->cause_flag = 1; |
1276 | return 0; |
1277 | } |
1278 | |
1279 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) |
1280 | { |
1281 | llc_sk(sk)->retry_count = 0; |
1282 | return 0; |
1283 | } |
1284 | |
1285 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) |
1286 | { |
1287 | llc_sk(sk)->retry_count++; |
1288 | return 0; |
1289 | } |
1290 | |
1291 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) |
1292 | { |
1293 | llc_sk(sk)->vR = 0; |
1294 | return 0; |
1295 | } |
1296 | |
1297 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) |
1298 | { |
1299 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); |
1300 | return 0; |
1301 | } |
1302 | |
1303 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) |
1304 | { |
1305 | llc_sk(sk)->vS = 0; |
1306 | return 0; |
1307 | } |
1308 | |
1309 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) |
1310 | { |
1311 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; |
1312 | return 0; |
1313 | } |
1314 | |
1315 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) |
1316 | { |
1317 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO; |
1318 | return 0; |
1319 | } |
1320 | |
1321 | static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) |
1322 | { |
1323 | struct sock *sk = (struct sock *)timeout_data; |
1324 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); |
1325 | |
1326 | bh_lock_sock(sk); |
1327 | if (skb) { |
1328 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); |
1329 | |
1330 | skb_set_owner_r(skb, sk); |
1331 | ev->type = type; |
1332 | llc_process_tmr_ev(sk, skb); |
1333 | } |
1334 | bh_unlock_sock(sk); |
1335 | } |
1336 | |
1337 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) |
1338 | { |
1339 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); |
1340 | } |
1341 | |
1342 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) |
1343 | { |
1344 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); |
1345 | } |
1346 | |
1347 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) |
1348 | { |
1349 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); |
1350 | } |
1351 | |
1352 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) |
1353 | { |
1354 | llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); |
1355 | } |
1356 | |
1357 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) |
1358 | { |
1359 | llc_sk(sk)->X = llc_sk(sk)->vS; |
1360 | llc_conn_ac_set_vs_nr(sk, skb); |
1361 | return 0; |
1362 | } |
1363 | |
1364 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) |
1365 | { |
1366 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); |
1367 | u8 nr = PDU_SUPV_GET_Nr(pdu); |
1368 | |
1369 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) |
1370 | llc_conn_ac_set_vs_nr(sk, skb); |
1371 | return 0; |
1372 | } |
1373 | |
1374 | /* |
1375 | * Non-standard actions; these not contained in IEEE specification; for |
1376 | * our own usage |
1377 | */ |
1378 | /** |
1379 | * llc_conn_disc - removes connection from SAP list and frees it |
1380 | * @sk: closed connection |
1381 | * @skb: occurred event |
1382 | */ |
1383 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) |
1384 | { |
1385 | /* FIXME: this thing seems to want to die */ |
1386 | return 0; |
1387 | } |
1388 | |
1389 | /** |
1390 | * llc_conn_reset - resets connection |
1391 | * @sk : reseting connection. |
1392 | * @skb: occurred event. |
1393 | * |
1394 | * Stop all timers, empty all queues and reset all flags. |
1395 | */ |
1396 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) |
1397 | { |
1398 | llc_sk_reset(sk); |
1399 | return 0; |
1400 | } |
1401 | |
1402 | /** |
1403 | * llc_circular_between - designates that b is between a and c or not |
1404 | * @a: lower bound |
1405 | * @b: element to see if is between a and b |
1406 | * @c: upper bound |
1407 | * |
1408 | * This function designates that b is between a and c or not (for example, |
1409 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 |
1410 | * otherwise. |
1411 | */ |
1412 | u8 llc_circular_between(u8 a, u8 b, u8 c) |
1413 | { |
1414 | b = b - a; |
1415 | c = c - a; |
1416 | return b <= c; |
1417 | } |
1418 | |
1419 | /** |
1420 | * llc_process_tmr_ev - timer backend |
1421 | * @sk: active connection |
1422 | * @skb: occurred event |
1423 | * |
1424 | * This function is called from timer callback functions. When connection |
1425 | * is busy (during sending a data frame) timer expiration event must be |
1426 | * queued. Otherwise this event can be sent to connection state machine. |
1427 | * Queued events will process by llc_backlog_rcv function after sending |
1428 | * data frame. |
1429 | */ |
1430 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) |
1431 | { |
1432 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { |
1433 | printk(KERN_WARNING "%s: timer called on closed connection\n", |
1434 | __func__); |
1435 | kfree_skb(skb); |
1436 | } else { |
1437 | if (!sock_owned_by_user(sk)) |
1438 | llc_conn_state_process(sk, skb); |
1439 | else { |
1440 | llc_set_backlog_type(skb, LLC_EVENT); |
1441 | __sk_add_backlog(sk, skb); |
1442 | } |
1443 | } |
1444 | } |
1445 |
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