1 /*
2 * llc_c_ev.c - Connection component state transition event qualifiers
3 *
4 * A 'state' consists of a number of possible event matching functions,
5 * the actions associated with each being executed when that event is
6 * matched; a 'state machine' accepts events in a serial fashion from an
7 * event queue. Each event is passed to each successive event matching
8 * function until a match is made (the event matching function returns
9 * success, or '') or the list of event matching functions is exhausted.
10 * If a match is made, the actions associated with the event are executed
11 * and the state is changed to that event's transition state. Before some
12 * events are recognized, even after a match has been made, a certain
13 * number of 'event qualifier' functions must also be executed. If these
14 * all execute successfully, then the event is finally executed.
15 *
16 * These event functions must return 0 for success, to show a matched
17 * event, of 1 if the event does not match. Event qualifier functions
18 * must return a 0 for success or a non-zero for failure. Each function
19 * is simply responsible for verifying one single thing and returning
20 * either a success or failure.
21 *
22 * All of followed event functions are described in 802.2 LLC Protocol
23 * standard document except two functions that we added that will explain
24 * in their comments, at below.
25 *
26 * Copyright (c) 1997 by Procom Technology, Inc.
27 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
28 *
29 * This program can be redistributed or modified under the terms of the
30 * GNU General Public License as published by the Free Software Foundation.
31 * This program is distributed without any warranty or implied warranty
32 * of merchantability or fitness for a particular purpose.
33 *
34 * See the GNU General Public License for more details.
35 */
36 #include <linux/netdevice.h>
37 #include <net/llc_conn.h>
38 #include <net/llc_sap.h>
39 #include <net/sock.h>
40 #include <net/llc_c_ac.h>
41 #include <net/llc_c_ev.h>
42 #include <net/llc_pdu.h>
43
44 #if 1
45 #define dprintk(args...) printk(KERN_DEBUG args)
46 #else
47 #define dprintk(args...)
48 #endif
49
50 /**
51 * llc_util_ns_inside_rx_window - check if sequence number is in rx window
52 * @ns: sequence number of received pdu.
53 * @vr: sequence number which receiver expects to receive.
54 * @rw: receive window size of receiver.
55 *
56 * Checks if sequence number of received PDU is in range of receive
57 * window. Returns 0 for success, 1 otherwise
58 */
59 static u16 llc_util_ns_inside_rx_window(u8 ns, u8 vr, u8 rw)
60 {
61 return !llc_circular_between(vr, ns,
62 (vr + rw - 1) % LLC_2_SEQ_NBR_MODULO);
63 }
64
65 /**
66 * llc_util_nr_inside_tx_window - check if sequence number is in tx window
67 * @sk: current connection.
68 * @nr: N(R) of received PDU.
69 *
70 * This routine checks if N(R) of received PDU is in range of transmit
71 * window; on the other hand checks if received PDU acknowledges some
72 * outstanding PDUs that are in transmit window. Returns 0 for success, 1
73 * otherwise.
74 */
75 static u16 llc_util_nr_inside_tx_window(struct sock *sk, u8 nr)
76 {
77 u8 nr1, nr2;
78 struct sk_buff *skb;
79 struct llc_pdu_sn *pdu;
80 struct llc_sock *llc = llc_sk(sk);
81 int rc = 0;
82
83 if (llc->dev->flags & IFF_LOOPBACK)
84 goto out;
85 rc = 1;
86 if (skb_queue_empty(&llc->pdu_unack_q))
87 goto out;
88 skb = skb_peek(&llc->pdu_unack_q);
89 pdu = llc_pdu_sn_hdr(skb);
90 nr1 = LLC_I_GET_NS(pdu);
91 skb = skb_peek_tail(&llc->pdu_unack_q);
92 pdu = llc_pdu_sn_hdr(skb);
93 nr2 = LLC_I_GET_NS(pdu);
94 rc = !llc_circular_between(nr1, nr, (nr2 + 1) % LLC_2_SEQ_NBR_MODULO);
95 out:
96 return rc;
97 }
98
99 int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb)
100 {
101 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
102
103 return ev->prim == LLC_CONN_PRIM &&
104 ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
105 }
106
107 int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb)
108 {
109 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
110
111 return ev->prim == LLC_DATA_PRIM &&
112 ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
113 }
114
115 int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb)
116 {
117 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
118
119 return ev->prim == LLC_DISC_PRIM &&
120 ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
121 }
122
123 int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb)
124 {
125 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
126
127 return ev->prim == LLC_RESET_PRIM &&
128 ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
129 }
130
131 int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb)
132 {
133 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
134
135 return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
136 ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_DETECTED ? 0 : 1;
137 }
138
139 int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb)
140 {
141 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
142
143 return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
144 ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_CLEARED ? 0 : 1;
145 }
146
147 int llc_conn_ev_rx_bad_pdu(struct sock *sk, struct sk_buff *skb)
148 {
149 return 1;
150 }
151
152 int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
153 {
154 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
155
156 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
157 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1;
158 }
159
160 int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
161 {
162 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
163
164 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
165 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM ? 0 : 1;
166 }
167
168 int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
169 {
170 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
171
172 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
173 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR ? 0 : 1;
174 }
175
176 int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
177 {
178 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
179
180 return llc_conn_space(sk, skb) &&
181 LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
182 LLC_I_PF_IS_0(pdu) &&
183 LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
184 }
185
186 int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
187 {
188 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
189
190 return llc_conn_space(sk, skb) &&
191 LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
192 LLC_I_PF_IS_1(pdu) &&
193 LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
194 }
195
196 int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk,
197 struct sk_buff *skb)
198 {
199 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
200 const u8 vr = llc_sk(sk)->vR;
201 const u8 ns = LLC_I_GET_NS(pdu);
202
203 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
204 LLC_I_PF_IS_0(pdu) && ns != vr &&
205 !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
206 }
207
208 int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk,
209 struct sk_buff *skb)
210 {
211 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
212 const u8 vr = llc_sk(sk)->vR;
213 const u8 ns = LLC_I_GET_NS(pdu);
214
215 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
216 LLC_I_PF_IS_1(pdu) && ns != vr &&
217 !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
218 }
219
220 int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk,
221 struct sk_buff *skb)
222 {
223 const struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb);
224 const u8 vr = llc_sk(sk)->vR;
225 const u8 ns = LLC_I_GET_NS(pdu);
226 const u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
227 ns != vr &&
228 llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
229 if (!rc)
230 dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
231 __func__, llc_sk(sk)->state, ns, vr);
232 return rc;
233 }
234
235 int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
236 {
237 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
238
239 return llc_conn_space(sk, skb) &&
240 LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
241 LLC_I_PF_IS_0(pdu) &&
242 LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
243 }
244
245 int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
246 {
247 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
248
249 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
250 LLC_I_PF_IS_1(pdu) &&
251 LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
252 }
253
254 int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
255 {
256 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
257
258 return llc_conn_space(sk, skb) &&
259 LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
260 LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
261 }
262
263 int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk,
264 struct sk_buff *skb)
265 {
266 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
267 const u8 vr = llc_sk(sk)->vR;
268 const u8 ns = LLC_I_GET_NS(pdu);
269
270 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
271 LLC_I_PF_IS_0(pdu) && ns != vr &&
272 !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
273 }
274
275 int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk,
276 struct sk_buff *skb)
277 {
278 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
279 const u8 vr = llc_sk(sk)->vR;
280 const u8 ns = LLC_I_GET_NS(pdu);
281
282 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
283 LLC_I_PF_IS_1(pdu) && ns != vr &&
284 !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
285 }
286
287 int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk,
288 struct sk_buff *skb)
289 {
290 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
291 const u8 vr = llc_sk(sk)->vR;
292 const u8 ns = LLC_I_GET_NS(pdu);
293
294 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
295 !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
296 }
297
298 int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk,
299 struct sk_buff *skb)
300 {
301 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
302 const u8 vr = llc_sk(sk)->vR;
303 const u8 ns = LLC_I_GET_NS(pdu);
304 const u16 rc = LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
305 ns != vr &&
306 llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
307 if (!rc)
308 dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
309 __func__, llc_sk(sk)->state, ns, vr);
310 return rc;
311 }
312
313 int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
314 {
315 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
316
317 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
318 LLC_S_PF_IS_0(pdu) &&
319 LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1;
320 }
321
322 int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
323 {
324 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
325
326 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
327 LLC_S_PF_IS_1(pdu) &&
328 LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1;
329 }
330
331 int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
332 {
333 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
334
335 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
336 LLC_S_PF_IS_0(pdu) &&
337 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
338 }
339
340 int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
341 {
342 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
343
344 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
345 LLC_S_PF_IS_1(pdu) &&
346 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
347 }
348
349 int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
350 {
351 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
352
353 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
354 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
355 }
356
357 int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
358 {
359 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
360
361 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
362 LLC_S_PF_IS_0(pdu) &&
363 LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1;
364 }
365
366 int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
367 {
368 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
369
370 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
371 LLC_S_PF_IS_1(pdu) &&
372 LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1;
373 }
374
375 int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
376 {
377 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
378
379 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
380 LLC_S_PF_IS_0(pdu) &&
381 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1;
382 }
383
384 int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
385 {
386 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
387
388 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
389 LLC_S_PF_IS_1(pdu) &&
390 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1;
391 }
392
393 int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
394 {
395 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
396
397 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
398 LLC_S_PF_IS_0(pdu) &&
399 LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
400 }
401
402 int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
403 {
404 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
405
406 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
407 LLC_S_PF_IS_1(pdu) &&
408 LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
409 }
410
411 int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
412 {
413 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
414
415 return llc_conn_space(sk, skb) &&
416 LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
417 LLC_S_PF_IS_0(pdu) &&
418 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1;
419 }
420
421 int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
422 {
423 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
424
425 return llc_conn_space(sk, skb) &&
426 LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
427 LLC_S_PF_IS_1(pdu) &&
428 LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1;
429 }
430
431 int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
432 {
433 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
434
435 return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
436 LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1;
437 }
438
439 int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
440 {
441 struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
442
443 return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
444 LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_UA ? 0 : 1;
445 }
446
447 int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
448 {
449 u16 rc = 1;
450 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
451
452 if (LLC_PDU_IS_CMD(pdu)) {
453 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
454 if (LLC_I_PF_IS_1(pdu))
455 rc = 0;
456 } else if (LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PF_IS_1(pdu))
457 rc = 0;
458 }
459 return rc;
460 }
461
462 int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
463 {
464 u16 rc = 1;
465 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
466
467 if (LLC_PDU_IS_CMD(pdu)) {
468 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
469 rc = 0;
470 else if (LLC_PDU_TYPE_IS_U(pdu))
471 switch (LLC_U_PDU_CMD(pdu)) {
472 case LLC_2_PDU_CMD_SABME:
473 case LLC_2_PDU_CMD_DISC:
474 rc = 0;
475 break;
476 }
477 }
478 return rc;
479 }
480
481 int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
482 {
483 u16 rc = 1;
484 const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
485
486 if (LLC_PDU_IS_RSP(pdu)) {
487 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
488 rc = 0;
489 else if (LLC_PDU_TYPE_IS_U(pdu))
490 switch (LLC_U_PDU_RSP(pdu)) {
491 case LLC_2_PDU_RSP_UA:
492 case LLC_2_PDU_RSP_DM:
493 case LLC_2_PDU_RSP_FRMR:
494 rc = 0;
495 break;
496 }
497 }
498
499 return rc;
500 }
501
502 int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk,
503 struct sk_buff *skb)
504 {
505 u16 rc = 1;
506 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
507 const u8 vs = llc_sk(sk)->vS;
508 const u8 nr = LLC_I_GET_NR(pdu);
509
510 if (LLC_PDU_IS_CMD(pdu) &&
511 (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
512 nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
513 dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
514 __func__, llc_sk(sk)->state, vs, nr);
515 rc = 0;
516 }
517 return rc;
518 }
519
520 int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk,
521 struct sk_buff *skb)
522 {
523 u16 rc = 1;
524 const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
525 const u8 vs = llc_sk(sk)->vS;
526 const u8 nr = LLC_I_GET_NR(pdu);
527
528 if (LLC_PDU_IS_RSP(pdu) &&
529 (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
530 nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
531 rc = 0;
532 dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
533 __func__, llc_sk(sk)->state, vs, nr);
534 }
535 return rc;
536 }
537
538 int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb)
539 {
540 return 0;
541 }
542
543 int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb)
544 {
545 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
546
547 return ev->type != LLC_CONN_EV_TYPE_P_TMR;
548 }
549
550 int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb)
551 {
552 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
553
554 return ev->type != LLC_CONN_EV_TYPE_ACK_TMR;
555 }
556
557 int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb)
558 {
559 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
560
561 return ev->type != LLC_CONN_EV_TYPE_REJ_TMR;
562 }
563
564 int llc_conn_ev_busy_tmr_exp(struct sock *sk, struct sk_buff *skb)
565 {
566 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
567
568 return ev->type != LLC_CONN_EV_TYPE_BUSY_TMR;
569 }
570
571 int llc_conn_ev_init_p_f_cycle(struct sock *sk, struct sk_buff *skb)
572 {
573 return 1;
574 }
575
576 int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb)
577 {
578 const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
579
580 return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
581 ev->prim_type == LLC_CONN_EV_TX_BUFF_FULL ? 0 : 1;
582 }
583
584 /* Event qualifier functions
585 *
586 * these functions simply verify the value of a state flag associated with
587 * the connection and return either a 0 for success or a non-zero value
588 * for not-success; verify the event is the type we expect
589 */
590 int llc_conn_ev_qlfy_data_flag_eq_1(struct sock *sk, struct sk_buff *skb)
591 {
592 return llc_sk(sk)->data_flag != 1;
593 }
594
595 int llc_conn_ev_qlfy_data_flag_eq_0(struct sock *sk, struct sk_buff *skb)
596 {
597 return llc_sk(sk)->data_flag;
598 }
599
600 int llc_conn_ev_qlfy_data_flag_eq_2(struct sock *sk, struct sk_buff *skb)
601 {
602 return llc_sk(sk)->data_flag != 2;
603 }
604
605 int llc_conn_ev_qlfy_p_flag_eq_1(struct sock *sk, struct sk_buff *skb)
606 {
607 return llc_sk(sk)->p_flag != 1;
608 }
609
610 /**
611 * llc_conn_ev_qlfy_last_frame_eq_1 - checks if frame is last in tx window
612 * @sk: current connection structure.
613 * @skb: current event.
614 *
615 * This function determines when frame which is sent, is last frame of
616 * transmit window, if it is then this function return zero else return
617 * one. This function is used for sending last frame of transmit window
618 * as I-format command with p-bit set to one. Returns 0 if frame is last
619 * frame, 1 otherwise.
620 */
621 int llc_conn_ev_qlfy_last_frame_eq_1(struct sock *sk, struct sk_buff *skb)
622 {
623 return !(skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k);
624 }
625
626 /**
627 * llc_conn_ev_qlfy_last_frame_eq_0 - checks if frame isn't last in tx window
628 * @sk: current connection structure.
629 * @skb: current event.
630 *
631 * This function determines when frame which is sent, isn't last frame of
632 * transmit window, if it isn't then this function return zero else return
633 * one. Returns 0 if frame isn't last frame, 1 otherwise.
634 */
635 int llc_conn_ev_qlfy_last_frame_eq_0(struct sock *sk, struct sk_buff *skb)
636 {
637 return skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k;
638 }
639
640 int llc_conn_ev_qlfy_p_flag_eq_0(struct sock *sk, struct sk_buff *skb)
641 {
642 return llc_sk(sk)->p_flag;
643 }
644
645 int llc_conn_ev_qlfy_p_flag_eq_f(struct sock *sk, struct sk_buff *skb)
646 {
647 u8 f_bit;
648
649 llc_pdu_decode_pf_bit(skb, &f_bit);
650 return llc_sk(sk)->p_flag == f_bit ? 0 : 1;
651 }
652
653 int llc_conn_ev_qlfy_remote_busy_eq_0(struct sock *sk, struct sk_buff *skb)
654 {
655 return llc_sk(sk)->remote_busy_flag;
656 }
657
658 int llc_conn_ev_qlfy_remote_busy_eq_1(struct sock *sk, struct sk_buff *skb)
659 {
660 return !llc_sk(sk)->remote_busy_flag;
661 }
662
663 int llc_conn_ev_qlfy_retry_cnt_lt_n2(struct sock *sk, struct sk_buff *skb)
664 {
665 return !(llc_sk(sk)->retry_count < llc_sk(sk)->n2);
666 }
667
668 int llc_conn_ev_qlfy_retry_cnt_gte_n2(struct sock *sk, struct sk_buff *skb)
669 {
670 return !(llc_sk(sk)->retry_count >= llc_sk(sk)->n2);
671 }
672
673 int llc_conn_ev_qlfy_s_flag_eq_1(struct sock *sk, struct sk_buff *skb)
674 {
675 return !llc_sk(sk)->s_flag;
676 }
677
678 int llc_conn_ev_qlfy_s_flag_eq_0(struct sock *sk, struct sk_buff *skb)
679 {
680 return llc_sk(sk)->s_flag;
681 }
682
683 int llc_conn_ev_qlfy_cause_flag_eq_1(struct sock *sk, struct sk_buff *skb)
684 {
685 return !llc_sk(sk)->cause_flag;
686 }
687
688 int llc_conn_ev_qlfy_cause_flag_eq_0(struct sock *sk, struct sk_buff *skb)
689 {
690 return llc_sk(sk)->cause_flag;
691 }
692
693 int llc_conn_ev_qlfy_set_status_conn(struct sock *sk, struct sk_buff *skb)
694 {
695 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
696
697 ev->status = LLC_STATUS_CONN;
698 return 0;
699 }
700
701 int llc_conn_ev_qlfy_set_status_disc(struct sock *sk, struct sk_buff *skb)
702 {
703 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
704
705 ev->status = LLC_STATUS_DISC;
706 return 0;
707 }
708
709 int llc_conn_ev_qlfy_set_status_failed(struct sock *sk, struct sk_buff *skb)
710 {
711 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
712
713 ev->status = LLC_STATUS_FAILED;
714 return 0;
715 }
716
717 int llc_conn_ev_qlfy_set_status_remote_busy(struct sock *sk,
718 struct sk_buff *skb)
719 {
720 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
721
722 ev->status = LLC_STATUS_REMOTE_BUSY;
723 return 0;
724 }
725
726 int llc_conn_ev_qlfy_set_status_refuse(struct sock *sk, struct sk_buff *skb)
727 {
728 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
729
730 ev->status = LLC_STATUS_REFUSE;
731 return 0;
732 }
733
734 int llc_conn_ev_qlfy_set_status_conflict(struct sock *sk, struct sk_buff *skb)
735 {
736 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
737
738 ev->status = LLC_STATUS_CONFLICT;
739 return 0;
740 }
741
742 int llc_conn_ev_qlfy_set_status_rst_done(struct sock *sk, struct sk_buff *skb)
743 {
744 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
745
746 ev->status = LLC_STATUS_RESET_DONE;
747 return 0;
748 }
749
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