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1da177e4 LT |
1 | /* |
2 | * llc_c_ac.c - actions performed during connection state transition. | |
3 | * | |
4 | * Description: | |
5 | * Functions in this module are implementation of connection component actions | |
6 | * Details of actions can be found in IEEE-802.2 standard document. | |
7 | * All functions have one connection and one event as input argument. All of | |
8 | * them return 0 On success and 1 otherwise. | |
9 | * | |
10 | * Copyright (c) 1997 by Procom Technology, Inc. | |
11 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
12 | * | |
13 | * This program can be redistributed or modified under the terms of the | |
14 | * GNU General Public License as published by the Free Software Foundation. | |
15 | * This program is distributed without any warranty or implied warranty | |
16 | * of merchantability or fitness for a particular purpose. | |
17 | * | |
18 | * See the GNU General Public License for more details. | |
19 | */ | |
20 | #include <linux/netdevice.h> | |
21 | #include <net/llc_conn.h> | |
22 | #include <net/llc_sap.h> | |
23 | #include <net/sock.h> | |
24 | #include <net/llc_c_ev.h> | |
25 | #include <net/llc_c_ac.h> | |
26 | #include <net/llc_c_st.h> | |
27 | #include <net/llc_pdu.h> | |
28 | #include <net/llc.h> | |
29 | ||
30 | #include "llc_output.h" | |
31 | ||
32 | static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); | |
33 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); | |
34 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); | |
35 | ||
36 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); | |
37 | ||
38 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
39 | struct sk_buff *skb); | |
40 | ||
41 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); | |
42 | ||
43 | #define INCORRECT 0 | |
44 | ||
45 | int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) | |
46 | { | |
47 | struct llc_sock *llc = llc_sk(sk); | |
48 | ||
49 | if (llc->remote_busy_flag) { | |
50 | u8 nr; | |
51 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
52 | ||
53 | llc->remote_busy_flag = 0; | |
54 | del_timer(&llc->busy_state_timer.timer); | |
55 | nr = LLC_I_GET_NR(pdu); | |
56 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
57 | } | |
58 | return 0; | |
59 | } | |
60 | ||
61 | int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) | |
62 | { | |
63 | int rc = -ENOTCONN; | |
64 | u8 dsap; | |
65 | struct llc_sap *sap; | |
66 | ||
67 | llc_pdu_decode_dsap(skb, &dsap); | |
68 | sap = llc_sap_find(dsap); | |
69 | if (sap) { | |
70 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
71 | struct llc_sock *llc = llc_sk(sk); | |
72 | ||
73 | llc_pdu_decode_sa(skb, llc->daddr.mac); | |
74 | llc_pdu_decode_da(skb, llc->laddr.mac); | |
75 | llc->dev = skb->dev; | |
76 | ev->ind_prim = LLC_CONN_PRIM; | |
77 | rc = 0; | |
78 | } | |
79 | return rc; | |
80 | } | |
81 | ||
82 | int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) | |
83 | { | |
84 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
85 | ||
86 | ev->cfm_prim = LLC_CONN_PRIM; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) | |
91 | { | |
92 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
93 | ||
94 | ev->cfm_prim = LLC_DATA_PRIM; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) | |
99 | { | |
100 | llc_conn_rtn_pdu(sk, skb); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) | |
105 | { | |
106 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
107 | u8 reason = 0; | |
108 | int rc = 0; | |
109 | ||
110 | if (ev->type == LLC_CONN_EV_TYPE_PDU) { | |
111 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
112 | ||
113 | if (LLC_PDU_IS_RSP(pdu) && | |
114 | LLC_PDU_TYPE_IS_U(pdu) && | |
115 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) | |
116 | reason = LLC_DISC_REASON_RX_DM_RSP_PDU; | |
117 | else if (LLC_PDU_IS_CMD(pdu) && | |
118 | LLC_PDU_TYPE_IS_U(pdu) && | |
119 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) | |
120 | reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; | |
121 | } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) | |
122 | reason = LLC_DISC_REASON_ACK_TMR_EXP; | |
123 | else { | |
124 | reason = 0; | |
125 | rc = -EINVAL; | |
126 | } | |
127 | if (!rc) { | |
128 | ev->reason = reason; | |
129 | ev->ind_prim = LLC_DISC_PRIM; | |
130 | } | |
131 | return rc; | |
132 | } | |
133 | ||
134 | int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) | |
135 | { | |
136 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
137 | ||
138 | ev->reason = ev->status; | |
139 | ev->cfm_prim = LLC_DISC_PRIM; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) | |
144 | { | |
145 | u8 reason = 0; | |
146 | int rc = 1; | |
147 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
148 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
149 | struct llc_sock *llc = llc_sk(sk); | |
150 | ||
151 | switch (ev->type) { | |
152 | case LLC_CONN_EV_TYPE_PDU: | |
153 | if (LLC_PDU_IS_RSP(pdu) && | |
154 | LLC_PDU_TYPE_IS_U(pdu) && | |
155 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { | |
156 | reason = LLC_RESET_REASON_LOCAL; | |
157 | rc = 0; | |
158 | } else if (LLC_PDU_IS_CMD(pdu) && | |
159 | LLC_PDU_TYPE_IS_U(pdu) && | |
160 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { | |
161 | reason = LLC_RESET_REASON_REMOTE; | |
162 | rc = 0; | |
163 | } else { | |
164 | reason = 0; | |
165 | rc = 1; | |
166 | } | |
167 | break; | |
168 | case LLC_CONN_EV_TYPE_ACK_TMR: | |
169 | case LLC_CONN_EV_TYPE_P_TMR: | |
170 | case LLC_CONN_EV_TYPE_REJ_TMR: | |
171 | case LLC_CONN_EV_TYPE_BUSY_TMR: | |
172 | if (llc->retry_count > llc->n2) { | |
173 | reason = LLC_RESET_REASON_LOCAL; | |
174 | rc = 0; | |
175 | } else | |
176 | rc = 1; | |
177 | break; | |
178 | } | |
179 | if (!rc) { | |
180 | ev->reason = reason; | |
181 | ev->ind_prim = LLC_RESET_PRIM; | |
182 | } | |
183 | return rc; | |
184 | } | |
185 | ||
186 | int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) | |
187 | { | |
188 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
189 | ||
190 | ev->reason = 0; | |
191 | ev->cfm_prim = LLC_RESET_PRIM; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, | |
196 | struct sk_buff *skb) | |
197 | { | |
198 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
199 | ||
200 | if (LLC_PDU_IS_RSP(pdu) && | |
201 | LLC_PDU_TYPE_IS_I(pdu) && | |
202 | LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf) | |
203 | llc_conn_ac_clear_remote_busy(sk, skb); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, | |
208 | struct sk_buff *skb) | |
209 | { | |
210 | struct llc_sock *llc = llc_sk(sk); | |
211 | ||
212 | if (llc->data_flag == 2) | |
213 | del_timer(&llc->rej_sent_timer.timer); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
218 | { | |
219 | int rc = -ENOBUFS; | |
220 | struct sk_buff *nskb = llc_alloc_frame(); | |
221 | ||
222 | if (nskb) { | |
223 | struct llc_sock *llc = llc_sk(sk); | |
224 | struct llc_sap *sap = llc->sap; | |
225 | ||
226 | nskb->dev = llc->dev; | |
227 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
228 | llc->daddr.lsap, LLC_PDU_CMD); | |
229 | llc_pdu_init_as_disc_cmd(nskb, 1); | |
230 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
231 | if (rc) | |
232 | goto free; | |
233 | llc_conn_send_pdu(sk, nskb); | |
234 | llc_conn_ac_set_p_flag_1(sk, skb); | |
235 | } | |
236 | out: | |
237 | return rc; | |
238 | free: | |
239 | kfree_skb(nskb); | |
240 | goto out; | |
241 | } | |
242 | ||
243 | int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
244 | { | |
245 | int rc = -ENOBUFS; | |
246 | struct sk_buff *nskb = llc_alloc_frame(); | |
247 | ||
248 | if (nskb) { | |
249 | struct llc_sock *llc = llc_sk(sk); | |
250 | struct llc_sap *sap = llc->sap; | |
251 | u8 f_bit; | |
252 | ||
253 | nskb->dev = llc->dev; | |
254 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
255 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
256 | llc->daddr.lsap, LLC_PDU_RSP); | |
257 | llc_pdu_init_as_dm_rsp(nskb, f_bit); | |
258 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
259 | if (rc) | |
260 | goto free; | |
261 | llc_conn_send_pdu(sk, nskb); | |
262 | } | |
263 | out: | |
264 | return rc; | |
265 | free: | |
266 | kfree_skb(nskb); | |
267 | goto out; | |
268 | } | |
269 | ||
270 | int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
271 | { | |
272 | int rc = -ENOBUFS; | |
273 | struct sk_buff *nskb = llc_alloc_frame(); | |
274 | ||
275 | if (nskb) { | |
276 | struct llc_sock *llc = llc_sk(sk); | |
277 | struct llc_sap *sap = llc->sap; | |
278 | u8 f_bit = 1; | |
279 | ||
280 | nskb->dev = llc->dev; | |
281 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
282 | llc->daddr.lsap, LLC_PDU_RSP); | |
283 | llc_pdu_init_as_dm_rsp(nskb, f_bit); | |
284 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
285 | if (rc) | |
286 | goto free; | |
287 | llc_conn_send_pdu(sk, nskb); | |
288 | } | |
289 | out: | |
290 | return rc; | |
291 | free: | |
292 | kfree_skb(nskb); | |
293 | goto out; | |
294 | } | |
295 | ||
296 | int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) | |
297 | { | |
298 | u8 f_bit; | |
299 | int rc = -ENOBUFS; | |
300 | struct sk_buff *nskb; | |
301 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
302 | struct llc_sock *llc = llc_sk(sk); | |
303 | ||
304 | llc->rx_pdu_hdr = *((u32 *)pdu); | |
305 | if (LLC_PDU_IS_CMD(pdu)) | |
306 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
307 | else | |
308 | f_bit = 0; | |
309 | nskb = llc_alloc_frame(); | |
310 | if (nskb) { | |
311 | struct llc_sap *sap = llc->sap; | |
312 | ||
313 | nskb->dev = llc->dev; | |
314 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
315 | llc->daddr.lsap, LLC_PDU_RSP); | |
316 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
317 | llc->vR, INCORRECT); | |
318 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
319 | if (rc) | |
320 | goto free; | |
321 | llc_conn_send_pdu(sk, nskb); | |
322 | } | |
323 | out: | |
324 | return rc; | |
325 | free: | |
326 | kfree_skb(nskb); | |
327 | goto out; | |
328 | } | |
329 | ||
330 | int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) | |
331 | { | |
332 | int rc = -ENOBUFS; | |
333 | struct sk_buff *nskb = llc_alloc_frame(); | |
334 | ||
335 | if (nskb) { | |
336 | u8 f_bit = 0; | |
337 | struct llc_sock *llc = llc_sk(sk); | |
338 | struct llc_sap *sap = llc->sap; | |
339 | struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; | |
340 | ||
341 | nskb->dev = llc->dev; | |
342 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
343 | llc->daddr.lsap, LLC_PDU_RSP); | |
344 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
345 | llc->vR, INCORRECT); | |
346 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
347 | if (rc) | |
348 | goto free; | |
349 | llc_conn_send_pdu(sk, nskb); | |
350 | } | |
351 | out: | |
352 | return rc; | |
353 | free: | |
354 | kfree_skb(nskb); | |
355 | goto out; | |
356 | } | |
357 | ||
358 | int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
359 | { | |
360 | u8 f_bit; | |
361 | int rc = -ENOBUFS; | |
362 | struct sk_buff *nskb; | |
363 | ||
364 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
365 | nskb = llc_alloc_frame(); | |
366 | if (nskb) { | |
367 | struct llc_sock *llc = llc_sk(sk); | |
368 | struct llc_sap *sap = llc->sap; | |
369 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
370 | ||
371 | nskb->dev = llc->dev; | |
372 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
373 | llc->daddr.lsap, LLC_PDU_RSP); | |
374 | llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, | |
375 | llc->vR, INCORRECT); | |
376 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
377 | if (rc) | |
378 | goto free; | |
379 | llc_conn_send_pdu(sk, nskb); | |
380 | } | |
381 | out: | |
382 | return rc; | |
383 | free: | |
384 | kfree_skb(nskb); | |
385 | goto out; | |
386 | } | |
387 | ||
388 | int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
389 | { | |
390 | int rc; | |
391 | struct llc_sock *llc = llc_sk(sk); | |
392 | struct llc_sap *sap = llc->sap; | |
393 | ||
394 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
395 | llc->daddr.lsap, LLC_PDU_CMD); | |
396 | llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR); | |
397 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
398 | if (!rc) { | |
399 | llc_conn_send_pdu(sk, skb); | |
400 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
401 | } | |
402 | return rc; | |
403 | } | |
404 | ||
405 | static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) | |
406 | { | |
407 | int rc; | |
408 | struct llc_sock *llc = llc_sk(sk); | |
409 | struct llc_sap *sap = llc->sap; | |
410 | ||
411 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
412 | llc->daddr.lsap, LLC_PDU_CMD); | |
413 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
414 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
415 | if (!rc) { | |
416 | llc_conn_send_pdu(sk, skb); | |
417 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
418 | } | |
419 | return rc; | |
420 | } | |
421 | ||
422 | int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
423 | { | |
424 | int rc; | |
425 | struct llc_sock *llc = llc_sk(sk); | |
426 | struct llc_sap *sap = llc->sap; | |
427 | ||
428 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
429 | llc->daddr.lsap, LLC_PDU_CMD); | |
430 | llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR); | |
431 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
432 | if (!rc) { | |
433 | llc_conn_send_pdu(sk, skb); | |
434 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
439 | int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
440 | { | |
441 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
442 | u8 nr = LLC_I_GET_NR(pdu); | |
443 | ||
444 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, | |
449 | struct sk_buff *skb) | |
450 | { | |
451 | u8 nr; | |
452 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
453 | int rc = -ENOBUFS; | |
454 | struct sk_buff *nskb = llc_alloc_frame(); | |
455 | ||
456 | if (nskb) { | |
457 | struct llc_sock *llc = llc_sk(sk); | |
458 | struct llc_sap *sap = llc->sap; | |
459 | ||
460 | nskb->dev = llc->dev; | |
461 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
462 | llc->daddr.lsap, LLC_PDU_RSP); | |
463 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
464 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
465 | if (!rc) | |
466 | llc_conn_send_pdu(sk, nskb); | |
467 | else | |
468 | kfree_skb(skb); | |
469 | } | |
470 | if (rc) { | |
471 | nr = LLC_I_GET_NR(pdu); | |
472 | rc = 0; | |
473 | llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); | |
474 | } | |
475 | return rc; | |
476 | } | |
477 | ||
478 | int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
479 | { | |
480 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
481 | u8 nr = LLC_I_GET_NR(pdu); | |
482 | ||
483 | llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); | |
484 | return 0; | |
485 | } | |
486 | ||
487 | int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
488 | { | |
489 | int rc = -ENOBUFS; | |
490 | struct sk_buff *nskb = llc_alloc_frame(); | |
491 | ||
492 | if (nskb) { | |
493 | struct llc_sock *llc = llc_sk(sk); | |
494 | struct llc_sap *sap = llc->sap; | |
495 | ||
496 | nskb->dev = llc->dev; | |
497 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
498 | llc->daddr.lsap, LLC_PDU_CMD); | |
499 | llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); | |
500 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
501 | if (rc) | |
502 | goto free; | |
503 | llc_conn_send_pdu(sk, nskb); | |
504 | } | |
505 | out: | |
506 | return rc; | |
507 | free: | |
508 | kfree_skb(nskb); | |
509 | goto out; | |
510 | } | |
511 | ||
512 | int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
513 | { | |
514 | int rc = -ENOBUFS; | |
515 | struct sk_buff *nskb = llc_alloc_frame(); | |
516 | ||
517 | if (nskb) { | |
518 | u8 f_bit = 1; | |
519 | struct llc_sock *llc = llc_sk(sk); | |
520 | struct llc_sap *sap = llc->sap; | |
521 | ||
522 | nskb->dev = llc->dev; | |
523 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
524 | llc->daddr.lsap, LLC_PDU_RSP); | |
525 | llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR); | |
526 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
527 | if (rc) | |
528 | goto free; | |
529 | llc_conn_send_pdu(sk, nskb); | |
530 | } | |
531 | out: | |
532 | return rc; | |
533 | free: | |
534 | kfree_skb(nskb); | |
535 | goto out; | |
536 | } | |
537 | ||
538 | int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
539 | { | |
540 | int rc = -ENOBUFS; | |
541 | struct sk_buff *nskb = llc_alloc_frame(); | |
542 | ||
543 | if (nskb) { | |
544 | struct llc_sock *llc = llc_sk(sk); | |
545 | struct llc_sap *sap = llc->sap; | |
546 | u8 f_bit = 0; | |
547 | ||
548 | nskb->dev = llc->dev; | |
549 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
550 | llc->daddr.lsap, LLC_PDU_RSP); | |
551 | llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR); | |
552 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
553 | if (rc) | |
554 | goto free; | |
555 | llc_conn_send_pdu(sk, nskb); | |
556 | } | |
557 | out: | |
558 | return rc; | |
559 | free: | |
560 | kfree_skb(nskb); | |
561 | goto out; | |
562 | } | |
563 | ||
564 | int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
565 | { | |
566 | int rc = -ENOBUFS; | |
567 | struct sk_buff *nskb = llc_alloc_frame(); | |
568 | ||
569 | if (nskb) { | |
570 | struct llc_sock *llc = llc_sk(sk); | |
571 | struct llc_sap *sap = llc->sap; | |
572 | ||
573 | nskb->dev = llc->dev; | |
574 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
575 | llc->daddr.lsap, LLC_PDU_CMD); | |
576 | llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); | |
577 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
578 | if (rc) | |
579 | goto free; | |
580 | llc_conn_send_pdu(sk, nskb); | |
581 | } | |
582 | out: | |
583 | return rc; | |
584 | free: | |
585 | kfree_skb(nskb); | |
586 | goto out; | |
587 | } | |
588 | ||
589 | int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
590 | { | |
591 | int rc = -ENOBUFS; | |
592 | struct sk_buff *nskb = llc_alloc_frame(); | |
593 | ||
594 | if (nskb) { | |
595 | struct llc_sock *llc = llc_sk(sk); | |
596 | struct llc_sap *sap = llc->sap; | |
597 | u8 f_bit = 1; | |
598 | ||
599 | nskb->dev = llc->dev; | |
600 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
601 | llc->daddr.lsap, LLC_PDU_RSP); | |
602 | llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR); | |
603 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
604 | if (rc) | |
605 | goto free; | |
606 | llc_conn_send_pdu(sk, nskb); | |
607 | } | |
608 | out: | |
609 | return rc; | |
610 | free: | |
611 | kfree_skb(nskb); | |
612 | goto out; | |
613 | } | |
614 | ||
615 | int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
616 | { | |
617 | int rc = -ENOBUFS; | |
618 | struct sk_buff *nskb = llc_alloc_frame(); | |
619 | ||
620 | if (nskb) { | |
621 | u8 f_bit = 0; | |
622 | struct llc_sock *llc = llc_sk(sk); | |
623 | struct llc_sap *sap = llc->sap; | |
624 | ||
625 | nskb->dev = llc->dev; | |
626 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
627 | llc->daddr.lsap, LLC_PDU_RSP); | |
628 | llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR); | |
629 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
630 | if (rc) | |
631 | goto free; | |
632 | llc_conn_send_pdu(sk, nskb); | |
633 | } | |
634 | out: | |
635 | return rc; | |
636 | free: | |
637 | kfree_skb(nskb); | |
638 | goto out; | |
639 | } | |
640 | ||
641 | int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) | |
642 | { | |
643 | struct llc_sock *llc = llc_sk(sk); | |
644 | ||
645 | if (!llc->remote_busy_flag) { | |
646 | llc->remote_busy_flag = 1; | |
647 | mod_timer(&llc->busy_state_timer.timer, | |
648 | jiffies + llc->busy_state_timer.expire * HZ); | |
649 | } | |
650 | return 0; | |
651 | } | |
652 | ||
653 | int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
654 | { | |
655 | int rc = -ENOBUFS; | |
656 | struct sk_buff *nskb = llc_alloc_frame(); | |
657 | ||
658 | if (nskb) { | |
659 | struct llc_sock *llc = llc_sk(sk); | |
660 | struct llc_sap *sap = llc->sap; | |
661 | ||
662 | nskb->dev = llc->dev; | |
663 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
664 | llc->daddr.lsap, LLC_PDU_RSP); | |
665 | llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); | |
666 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
667 | if (rc) | |
668 | goto free; | |
669 | llc_conn_send_pdu(sk, nskb); | |
670 | } | |
671 | out: | |
672 | return rc; | |
673 | free: | |
674 | kfree_skb(nskb); | |
675 | goto out; | |
676 | } | |
677 | ||
678 | int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) | |
679 | { | |
680 | int rc = -ENOBUFS; | |
681 | struct sk_buff *nskb = llc_alloc_frame(); | |
682 | ||
683 | if (nskb) { | |
684 | struct llc_sock *llc = llc_sk(sk); | |
685 | struct llc_sap *sap = llc->sap; | |
686 | ||
687 | nskb->dev = llc->dev; | |
688 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
689 | llc->daddr.lsap, LLC_PDU_CMD); | |
690 | llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); | |
691 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
692 | if (rc) | |
693 | goto free; | |
694 | llc_conn_send_pdu(sk, nskb); | |
695 | } | |
696 | out: | |
697 | return rc; | |
698 | free: | |
699 | kfree_skb(nskb); | |
700 | goto out; | |
701 | } | |
702 | ||
703 | int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
704 | { | |
705 | int rc = -ENOBUFS; | |
706 | struct sk_buff *nskb = llc_alloc_frame(); | |
707 | ||
708 | if (nskb) { | |
709 | struct llc_sock *llc = llc_sk(sk); | |
710 | struct llc_sap *sap = llc->sap; | |
711 | u8 f_bit = 1; | |
712 | ||
713 | nskb->dev = llc->dev; | |
714 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
715 | llc->daddr.lsap, LLC_PDU_RSP); | |
716 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
717 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
718 | if (rc) | |
719 | goto free; | |
720 | llc_conn_send_pdu(sk, nskb); | |
721 | } | |
722 | out: | |
723 | return rc; | |
724 | free: | |
725 | kfree_skb(nskb); | |
726 | goto out; | |
727 | } | |
728 | ||
729 | int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) | |
730 | { | |
731 | int rc = -ENOBUFS; | |
732 | struct sk_buff *nskb = llc_alloc_frame(); | |
733 | ||
734 | if (nskb) { | |
735 | struct llc_sock *llc = llc_sk(sk); | |
736 | struct llc_sap *sap = llc->sap; | |
737 | u8 f_bit = 1; | |
738 | ||
739 | nskb->dev = llc->dev; | |
740 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
741 | llc->daddr.lsap, LLC_PDU_RSP); | |
742 | llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); | |
743 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
744 | if (rc) | |
745 | goto free; | |
746 | llc_conn_send_pdu(sk, nskb); | |
747 | } | |
748 | out: | |
749 | return rc; | |
750 | free: | |
751 | kfree_skb(nskb); | |
752 | goto out; | |
753 | } | |
754 | ||
755 | int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
756 | { | |
757 | int rc = -ENOBUFS; | |
758 | struct sk_buff *nskb = llc_alloc_frame(); | |
759 | ||
760 | if (nskb) { | |
761 | struct llc_sock *llc = llc_sk(sk); | |
762 | struct llc_sap *sap = llc->sap; | |
763 | ||
764 | nskb->dev = llc->dev; | |
765 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
766 | llc->daddr.lsap, LLC_PDU_RSP); | |
767 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
768 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
769 | if (rc) | |
770 | goto free; | |
771 | llc_conn_send_pdu(sk, nskb); | |
772 | } | |
773 | out: | |
774 | return rc; | |
775 | free: | |
776 | kfree_skb(nskb); | |
777 | goto out; | |
778 | } | |
779 | ||
780 | int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) | |
781 | { | |
782 | int rc = -ENOBUFS; | |
783 | struct sk_buff *nskb = llc_alloc_frame(); | |
784 | ||
785 | if (nskb) { | |
786 | struct llc_sock *llc = llc_sk(sk); | |
787 | struct llc_sap *sap = llc->sap; | |
788 | ||
789 | nskb->dev = llc->dev; | |
790 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
791 | llc->daddr.lsap, LLC_PDU_RSP); | |
792 | llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); | |
793 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
794 | if (rc) | |
795 | goto free; | |
796 | llc_conn_send_pdu(sk, nskb); | |
797 | } | |
798 | out: | |
799 | return rc; | |
800 | free: | |
801 | kfree_skb(nskb); | |
802 | goto out; | |
803 | } | |
804 | ||
805 | void llc_conn_set_p_flag(struct sock *sk, u8 value) | |
806 | { | |
807 | int state_changed = llc_sk(sk)->p_flag && !value; | |
808 | ||
809 | llc_sk(sk)->p_flag = value; | |
810 | ||
811 | if (state_changed) | |
812 | sk->sk_state_change(sk); | |
813 | } | |
814 | ||
815 | int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) | |
816 | { | |
817 | int rc = -ENOBUFS; | |
818 | struct sk_buff *nskb = llc_alloc_frame(); | |
819 | struct llc_sock *llc = llc_sk(sk); | |
820 | ||
821 | if (nskb) { | |
822 | struct llc_sap *sap = llc->sap; | |
823 | u8 *dmac = llc->daddr.mac; | |
824 | ||
825 | if (llc->dev->flags & IFF_LOOPBACK) | |
826 | dmac = llc->dev->dev_addr; | |
827 | nskb->dev = llc->dev; | |
828 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
829 | llc->daddr.lsap, LLC_PDU_CMD); | |
830 | llc_pdu_init_as_sabme_cmd(nskb, 1); | |
831 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); | |
832 | if (rc) | |
833 | goto free; | |
834 | llc_conn_send_pdu(sk, nskb); | |
835 | llc_conn_set_p_flag(sk, 1); | |
836 | } | |
837 | out: | |
838 | return rc; | |
839 | free: | |
840 | kfree_skb(nskb); | |
841 | goto out; | |
842 | } | |
843 | ||
844 | int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) | |
845 | { | |
846 | u8 f_bit; | |
847 | int rc = -ENOBUFS; | |
848 | struct sk_buff *nskb = llc_alloc_frame(); | |
849 | ||
850 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
851 | if (nskb) { | |
852 | struct llc_sock *llc = llc_sk(sk); | |
853 | struct llc_sap *sap = llc->sap; | |
854 | ||
855 | nskb->dev = llc->dev; | |
856 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, | |
857 | llc->daddr.lsap, LLC_PDU_RSP); | |
858 | llc_pdu_init_as_ua_rsp(nskb, f_bit); | |
859 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
860 | if (rc) | |
861 | goto free; | |
862 | llc_conn_send_pdu(sk, nskb); | |
863 | } | |
864 | out: | |
865 | return rc; | |
866 | free: | |
867 | kfree_skb(nskb); | |
868 | goto out; | |
869 | } | |
870 | ||
871 | int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) | |
872 | { | |
873 | llc_sk(sk)->s_flag = 0; | |
874 | return 0; | |
875 | } | |
876 | ||
877 | int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) | |
878 | { | |
879 | llc_sk(sk)->s_flag = 1; | |
880 | return 0; | |
881 | } | |
882 | ||
883 | int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) | |
884 | { | |
885 | struct llc_sock *llc = llc_sk(sk); | |
886 | ||
887 | llc_conn_set_p_flag(sk, 1); | |
888 | mod_timer(&llc->pf_cycle_timer.timer, | |
889 | jiffies + llc->pf_cycle_timer.expire * HZ); | |
890 | return 0; | |
891 | } | |
892 | ||
893 | /** | |
894 | * llc_conn_ac_send_ack_if_needed - check if ack is needed | |
895 | * @sk: current connection structure | |
896 | * @skb: current event | |
897 | * | |
898 | * Checks number of received PDUs which have not been acknowledged, yet, | |
899 | * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then | |
900 | * sends an RR response as acknowledgement for them. Returns 0 for | |
901 | * success, 1 otherwise. | |
902 | */ | |
903 | int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct sk_buff *skb) | |
904 | { | |
905 | u8 pf_bit; | |
906 | struct llc_sock *llc = llc_sk(sk); | |
907 | ||
908 | llc_pdu_decode_pf_bit(skb, &pf_bit); | |
909 | llc->ack_pf |= pf_bit & 1; | |
910 | if (!llc->ack_must_be_send) { | |
911 | llc->first_pdu_Ns = llc->vR; | |
912 | llc->ack_must_be_send = 1; | |
913 | llc->ack_pf = pf_bit & 1; | |
914 | } | |
915 | if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) { | |
916 | llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); | |
917 | llc->ack_must_be_send = 0; | |
918 | llc->ack_pf = 0; | |
919 | llc_conn_ac_inc_npta_value(sk, skb); | |
920 | } | |
921 | return 0; | |
922 | } | |
923 | ||
924 | /** | |
925 | * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag | |
926 | * @sk: current connection structure | |
927 | * @skb: current event | |
928 | * | |
929 | * This action resets ack_must_be_send flag of given connection, this flag | |
930 | * indicates if there is any PDU which has not been acknowledged yet. | |
931 | * Returns 0 for success, 1 otherwise. | |
932 | */ | |
933 | int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb) | |
934 | { | |
935 | llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; | |
936 | return 0; | |
937 | } | |
938 | ||
939 | /** | |
940 | * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs | |
941 | * @sk: current connection structure | |
942 | * @skb: current event | |
943 | * | |
944 | * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to | |
945 | * all received PDUs which have not been acknowledged, yet. ack_pf flag is | |
946 | * set to one if one PDU with p-bit set to one is received. Returns 0 for | |
947 | * success, 1 otherwise. | |
948 | */ | |
949 | static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, | |
950 | struct sk_buff *skb) | |
951 | { | |
952 | int rc; | |
953 | struct llc_sock *llc = llc_sk(sk); | |
954 | struct llc_sap *sap = llc->sap; | |
955 | ||
956 | llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, | |
957 | llc->daddr.lsap, LLC_PDU_RSP); | |
958 | llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); | |
959 | rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); | |
960 | if (!rc) { | |
961 | llc_conn_send_pdu(sk, skb); | |
962 | llc_conn_ac_inc_vs_by_1(sk, skb); | |
963 | } | |
964 | return rc; | |
965 | } | |
966 | ||
967 | /** | |
968 | * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs | |
969 | * @sk: current connection structure. | |
970 | * @skb: current event. | |
971 | * | |
972 | * This action sends an I-format PDU as acknowledge to received PDUs which | |
973 | * have not been acknowledged, yet, if there is any. By using of this | |
974 | * action number of acknowledgements decreases, this technic is called | |
975 | * piggy backing. Returns 0 for success, 1 otherwise. | |
976 | */ | |
977 | int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb) | |
978 | { | |
979 | struct llc_sock *llc = llc_sk(sk); | |
980 | ||
981 | if (llc->ack_must_be_send) { | |
982 | llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); | |
983 | llc->ack_must_be_send = 0 ; | |
984 | llc->ack_pf = 0; | |
985 | } else | |
986 | llc_conn_ac_send_i_cmd_p_set_0(sk, skb); | |
987 | return 0; | |
988 | } | |
989 | ||
990 | /** | |
991 | * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked | |
992 | * @sk: current connection structure. | |
993 | * @skb: current event. | |
994 | * | |
995 | * This action sends an RR response with f-bit set to ack_pf flag as | |
996 | * acknowledge to all received PDUs which have not been acknowledged, yet, | |
997 | * if there is any. ack_pf flag indicates if a PDU has been received with | |
998 | * p-bit set to one. Returns 0 for success, 1 otherwise. | |
999 | */ | |
1000 | static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, | |
1001 | struct sk_buff *skb) | |
1002 | { | |
1003 | int rc = -ENOBUFS; | |
1004 | struct sk_buff *nskb = llc_alloc_frame(); | |
1005 | ||
1006 | if (nskb) { | |
1007 | struct llc_sock *llc = llc_sk(sk); | |
1008 | struct llc_sap *sap = llc->sap; | |
1009 | ||
1010 | nskb->dev = llc->dev; | |
1011 | llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, | |
1012 | llc->daddr.lsap, LLC_PDU_RSP); | |
1013 | llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); | |
1014 | rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); | |
1015 | if (rc) | |
1016 | goto free; | |
1017 | llc_conn_send_pdu(sk, nskb); | |
1018 | } | |
1019 | out: | |
1020 | return rc; | |
1021 | free: | |
1022 | kfree_skb(nskb); | |
1023 | goto out; | |
1024 | } | |
1025 | ||
1026 | /** | |
1027 | * llc_conn_ac_inc_npta_value - tries to make value of npta greater | |
1028 | * @sk: current connection structure. | |
1029 | * @skb: current event. | |
1030 | * | |
1031 | * After "inc_cntr" times calling of this action, "npta" increase by one. | |
1032 | * this action tries to make vale of "npta" greater as possible; number of | |
1033 | * acknowledgements decreases by increasing of "npta". Returns 0 for | |
1034 | * success, 1 otherwise. | |
1035 | */ | |
1036 | static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) | |
1037 | { | |
1038 | struct llc_sock *llc = llc_sk(sk); | |
1039 | ||
1040 | if (!llc->inc_cntr) { | |
1041 | llc->dec_step = 0; | |
1042 | llc->dec_cntr = llc->inc_cntr = 2; | |
1043 | ++llc->npta; | |
1044 | if (llc->npta > 127) | |
1045 | llc->npta = 127 ; | |
1046 | } else | |
1047 | --llc->inc_cntr; | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one | |
1053 | * @sk: current connection structure. | |
1054 | * @skb: current event. | |
1055 | * | |
1056 | * After receiving "dec_cntr" times RR command, this action decreases | |
1057 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1058 | */ | |
1059 | int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct sk_buff *skb) | |
1060 | { | |
1061 | struct llc_sock *llc = llc_sk(sk); | |
1062 | ||
1063 | if (!llc->connect_step && !llc->remote_busy_flag) { | |
1064 | if (!llc->dec_step) { | |
1065 | if (!llc->dec_cntr) { | |
1066 | llc->inc_cntr = llc->dec_cntr = 2; | |
1067 | if (llc->npta > 0) | |
1068 | llc->npta = llc->npta - 1; | |
1069 | } else | |
1070 | llc->dec_cntr -=1; | |
1071 | } | |
1072 | } else | |
1073 | llc->connect_step = 0 ; | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | /** | |
1078 | * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one | |
1079 | * @sk: current connection structure. | |
1080 | * @skb: current event. | |
1081 | * | |
1082 | * After receiving "dec_cntr" times RNR command, this action decreases | |
1083 | * "npta" by one. Returns 0 for success, 1 otherwise. | |
1084 | */ | |
1085 | int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct sk_buff *skb) | |
1086 | { | |
1087 | struct llc_sock *llc = llc_sk(sk); | |
1088 | ||
1089 | if (llc->remote_busy_flag) | |
1090 | if (!llc->dec_step) { | |
1091 | if (!llc->dec_cntr) { | |
1092 | llc->inc_cntr = llc->dec_cntr = 2; | |
1093 | if (llc->npta > 0) | |
1094 | --llc->npta; | |
1095 | } else | |
1096 | --llc->dec_cntr; | |
1097 | } | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * llc_conn_ac_dec_tx_win_size - decreases tx window size | |
1103 | * @sk: current connection structure. | |
1104 | * @skb: current event. | |
1105 | * | |
1106 | * After receiving of a REJ command or response, transmit window size is | |
1107 | * decreased by number of PDUs which are outstanding yet. Returns 0 for | |
1108 | * success, 1 otherwise. | |
1109 | */ | |
1110 | int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1111 | { | |
1112 | struct llc_sock *llc = llc_sk(sk); | |
1113 | u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); | |
1114 | ||
1115 | llc->k -= unacked_pdu; | |
1116 | if (llc->k < 2) | |
1117 | llc->k = 2; | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 | |
1123 | * @sk: current connection structure. | |
1124 | * @skb: current event. | |
1125 | * | |
1126 | * After receiving an RR response with f-bit set to one, transmit window | |
1127 | * size is increased by one. Returns 0 for success, 1 otherwise. | |
1128 | */ | |
1129 | int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct sk_buff *skb) | |
1130 | { | |
1131 | struct llc_sock *llc = llc_sk(sk); | |
1132 | ||
1133 | llc->k += 1; | |
1134 | if (llc->k > 128) | |
1135 | llc->k = 128 ; | |
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) | |
1140 | { | |
1141 | struct llc_sock *llc = llc_sk(sk); | |
1142 | ||
1143 | del_timer(&llc->pf_cycle_timer.timer); | |
1144 | del_timer(&llc->ack_timer.timer); | |
1145 | del_timer(&llc->rej_sent_timer.timer); | |
1146 | del_timer(&llc->busy_state_timer.timer); | |
1147 | llc->ack_must_be_send = 0; | |
1148 | llc->ack_pf = 0; | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) | |
1153 | { | |
1154 | struct llc_sock *llc = llc_sk(sk); | |
1155 | ||
1156 | del_timer(&llc->rej_sent_timer.timer); | |
1157 | del_timer(&llc->pf_cycle_timer.timer); | |
1158 | del_timer(&llc->busy_state_timer.timer); | |
1159 | llc->ack_must_be_send = 0; | |
1160 | llc->ack_pf = 0; | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1165 | { | |
1166 | struct llc_sock *llc = llc_sk(sk); | |
1167 | ||
1168 | mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ); | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1173 | { | |
1174 | struct llc_sock *llc = llc_sk(sk); | |
1175 | ||
1176 | mod_timer(&llc->rej_sent_timer.timer, | |
1177 | jiffies + llc->rej_sent_timer.expire * HZ); | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, | |
1182 | struct sk_buff *skb) | |
1183 | { | |
1184 | struct llc_sock *llc = llc_sk(sk); | |
1185 | ||
1186 | if (!timer_pending(&llc->ack_timer.timer)) | |
1187 | mod_timer(&llc->ack_timer.timer, | |
1188 | jiffies + llc->ack_timer.expire * HZ); | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) | |
1193 | { | |
1194 | del_timer(&llc_sk(sk)->ack_timer.timer); | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) | |
1199 | { | |
1200 | struct llc_sock *llc = llc_sk(sk); | |
1201 | ||
1202 | del_timer(&llc->pf_cycle_timer.timer); | |
1203 | llc_conn_set_p_flag(sk, 0); | |
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) | |
1208 | { | |
1209 | del_timer(&llc_sk(sk)->rej_sent_timer.timer); | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) | |
1214 | { | |
1215 | int acked; | |
1216 | u16 unacked = 0; | |
1217 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1218 | struct llc_sock *llc = llc_sk(sk); | |
1219 | ||
1220 | llc->last_nr = PDU_SUPV_GET_Nr(pdu); | |
1221 | acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); | |
1222 | /* On loopback we don't queue I frames in unack_pdu_q queue. */ | |
1223 | if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { | |
1224 | llc->retry_count = 0; | |
1225 | del_timer(&llc->ack_timer.timer); | |
1226 | if (llc->failed_data_req) { | |
1227 | /* already, we did not accept data from upper layer | |
1228 | * (tx_window full or unacceptable state). Now, we | |
1229 | * can send data and must inform to upper layer. | |
1230 | */ | |
1231 | llc->failed_data_req = 0; | |
1232 | llc_conn_ac_data_confirm(sk, skb); | |
1233 | } | |
1234 | if (unacked) | |
1235 | mod_timer(&llc->ack_timer.timer, | |
1236 | jiffies + llc->ack_timer.expire * HZ); | |
1237 | } else if (llc->failed_data_req) { | |
1238 | u8 f_bit; | |
1239 | ||
1240 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1241 | if (f_bit == 1) { | |
1242 | llc->failed_data_req = 0; | |
1243 | llc_conn_ac_data_confirm(sk, skb); | |
1244 | } | |
1245 | } | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) | |
1250 | { | |
1251 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1252 | ||
1253 | if (LLC_PDU_IS_RSP(pdu)) { | |
1254 | u8 f_bit; | |
1255 | ||
1256 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
1257 | if (f_bit) { | |
1258 | llc_conn_set_p_flag(sk, 0); | |
1259 | llc_conn_ac_stop_p_timer(sk, skb); | |
1260 | } | |
1261 | } | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) | |
1266 | { | |
1267 | llc_sk(sk)->data_flag = 2; | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) | |
1272 | { | |
1273 | llc_sk(sk)->data_flag = 0; | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) | |
1278 | { | |
1279 | llc_sk(sk)->data_flag = 1; | |
1280 | return 0; | |
1281 | } | |
1282 | ||
1283 | int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, | |
1284 | struct sk_buff *skb) | |
1285 | { | |
1286 | if (!llc_sk(sk)->data_flag) | |
1287 | llc_sk(sk)->data_flag = 1; | |
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | int llc_conn_ac_set_p_flag_0(struct sock *sk, struct sk_buff *skb) | |
1292 | { | |
1293 | llc_conn_set_p_flag(sk, 0); | |
1294 | return 0; | |
1295 | } | |
1296 | ||
1297 | static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) | |
1298 | { | |
1299 | llc_conn_set_p_flag(sk, 1); | |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) | |
1304 | { | |
1305 | llc_sk(sk)->remote_busy_flag = 0; | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) | |
1310 | { | |
1311 | llc_sk(sk)->cause_flag = 0; | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) | |
1316 | { | |
1317 | llc_sk(sk)->cause_flag = 1; | |
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) | |
1322 | { | |
1323 | llc_sk(sk)->retry_count = 0; | |
1324 | return 0; | |
1325 | } | |
1326 | ||
1327 | int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) | |
1328 | { | |
1329 | llc_sk(sk)->retry_count++; | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) | |
1334 | { | |
1335 | llc_sk(sk)->vR = 0; | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) | |
1340 | { | |
1341 | llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | int llc_conn_ac_set_vs_0(struct sock *sk, struct sk_buff *skb) | |
1346 | { | |
1347 | llc_sk(sk)->vS = 0; | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) | |
1352 | { | |
1353 | llc_sk(sk)->vS = llc_sk(sk)->last_nr; | |
1354 | return 0; | |
1355 | } | |
1356 | ||
1357 | int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) | |
1358 | { | |
1359 | llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128; | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) | |
1364 | { | |
1365 | struct sock *sk = (struct sock *)timeout_data; | |
1366 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1367 | ||
1368 | bh_lock_sock(sk); | |
1369 | if (skb) { | |
1370 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1371 | ||
1372 | skb->sk = sk; | |
1373 | ev->type = LLC_CONN_EV_TYPE_P_TMR; | |
1374 | llc_process_tmr_ev(sk, skb); | |
1375 | } | |
1376 | bh_unlock_sock(sk); | |
1377 | } | |
1378 | ||
1379 | void llc_conn_busy_tmr_cb(unsigned long timeout_data) | |
1380 | { | |
1381 | struct sock *sk = (struct sock *)timeout_data; | |
1382 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1383 | ||
1384 | bh_lock_sock(sk); | |
1385 | if (skb) { | |
1386 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1387 | ||
1388 | skb->sk = sk; | |
1389 | ev->type = LLC_CONN_EV_TYPE_BUSY_TMR; | |
1390 | llc_process_tmr_ev(sk, skb); | |
1391 | } | |
1392 | bh_unlock_sock(sk); | |
1393 | } | |
1394 | ||
1395 | void llc_conn_ack_tmr_cb(unsigned long timeout_data) | |
1396 | { | |
1397 | struct sock* sk = (struct sock *)timeout_data; | |
1398 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1399 | ||
1400 | bh_lock_sock(sk); | |
1401 | if (skb) { | |
1402 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1403 | ||
1404 | skb->sk = sk; | |
1405 | ev->type = LLC_CONN_EV_TYPE_ACK_TMR; | |
1406 | llc_process_tmr_ev(sk, skb); | |
1407 | } | |
1408 | bh_unlock_sock(sk); | |
1409 | } | |
1410 | ||
1411 | void llc_conn_rej_tmr_cb(unsigned long timeout_data) | |
1412 | { | |
1413 | struct sock *sk = (struct sock *)timeout_data; | |
1414 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
1415 | ||
1416 | bh_lock_sock(sk); | |
1417 | if (skb) { | |
1418 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
1419 | ||
1420 | skb->sk = sk; | |
1421 | ev->type = LLC_CONN_EV_TYPE_REJ_TMR; | |
1422 | llc_process_tmr_ev(sk, skb); | |
1423 | } | |
1424 | bh_unlock_sock(sk); | |
1425 | } | |
1426 | ||
1427 | int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) | |
1428 | { | |
1429 | llc_sk(sk)->X = llc_sk(sk)->vS; | |
1430 | llc_conn_ac_set_vs_nr(sk, skb); | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) | |
1435 | { | |
1436 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
1437 | u8 nr = PDU_SUPV_GET_Nr(pdu); | |
1438 | ||
1439 | if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) | |
1440 | llc_conn_ac_set_vs_nr(sk, skb); | |
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | /* | |
1445 | * Non-standard actions; these not contained in IEEE specification; for | |
1446 | * our own usage | |
1447 | */ | |
1448 | /** | |
1449 | * llc_conn_disc - removes connection from SAP list and frees it | |
1450 | * @sk: closed connection | |
1451 | * @skb: occurred event | |
1452 | */ | |
1453 | int llc_conn_disc(struct sock *sk, struct sk_buff *skb) | |
1454 | { | |
1455 | /* FIXME: this thing seems to want to die */ | |
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | /** | |
1460 | * llc_conn_reset - resets connection | |
1461 | * @sk : reseting connection. | |
1462 | * @skb: occurred event. | |
1463 | * | |
1464 | * Stop all timers, empty all queues and reset all flags. | |
1465 | */ | |
1466 | int llc_conn_reset(struct sock *sk, struct sk_buff *skb) | |
1467 | { | |
1468 | llc_sk_reset(sk); | |
1469 | return 0; | |
1470 | } | |
1471 | ||
1472 | /** | |
1473 | * llc_circular_between - designates that b is between a and c or not | |
1474 | * @a: lower bound | |
1475 | * @b: element to see if is between a and b | |
1476 | * @c: upper bound | |
1477 | * | |
1478 | * This function designates that b is between a and c or not (for example, | |
1479 | * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 | |
1480 | * otherwise. | |
1481 | */ | |
1482 | u8 llc_circular_between(u8 a, u8 b, u8 c) | |
1483 | { | |
1484 | b = b - a; | |
1485 | c = c - a; | |
1486 | return b <= c; | |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * llc_process_tmr_ev - timer backend | |
1491 | * @sk: active connection | |
1492 | * @skb: occurred event | |
1493 | * | |
1494 | * This function is called from timer callback functions. When connection | |
1495 | * is busy (during sending a data frame) timer expiration event must be | |
1496 | * queued. Otherwise this event can be sent to connection state machine. | |
1497 | * Queued events will process by llc_backlog_rcv function after sending | |
1498 | * data frame. | |
1499 | */ | |
1500 | static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) | |
1501 | { | |
1502 | if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { | |
1503 | printk(KERN_WARNING "%s: timer called on closed connection\n", | |
1504 | __FUNCTION__); | |
1505 | kfree_skb(skb); | |
1506 | } else { | |
1507 | if (!sock_owned_by_user(sk)) | |
1508 | llc_conn_state_process(sk, skb); | |
1509 | else { | |
1510 | llc_set_backlog_type(skb, LLC_EVENT); | |
1511 | sk_add_backlog(sk, skb); | |
1512 | } | |
1513 | } | |
1514 | } |