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1da177e4 LT |
1 | /* $Id: isdnl2.c,v 2.30.2.4 2004/02/11 13:21:34 keil Exp $ |
2 | * | |
3 | * Author Karsten Keil | |
4 | * based on the teles driver from Jan den Ouden | |
5 | * Copyright by Karsten Keil <keil@isdn4linux.de> | |
475be4d8 | 6 | * |
1da177e4 LT |
7 | * This software may be used and distributed according to the terms |
8 | * of the GNU General Public License, incorporated herein by reference. | |
9 | * | |
10 | * For changes and modifications please read | |
11 | * Documentation/isdn/HiSax.cert | |
12 | * | |
13 | * Thanks to Jan den Ouden | |
14 | * Fritz Elfert | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/init.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include "hisax.h" |
21 | #include "isdnl2.h" | |
22 | ||
23 | const char *l2_revision = "$Revision: 2.30.2.4 $"; | |
24 | ||
25 | static void l2m_debug(struct FsmInst *fi, char *fmt, ...); | |
26 | ||
27 | static struct Fsm l2fsm; | |
28 | ||
29 | enum { | |
30 | ST_L2_1, | |
31 | ST_L2_2, | |
32 | ST_L2_3, | |
33 | ST_L2_4, | |
34 | ST_L2_5, | |
35 | ST_L2_6, | |
36 | ST_L2_7, | |
37 | ST_L2_8, | |
38 | }; | |
39 | ||
475be4d8 | 40 | #define L2_STATE_COUNT (ST_L2_8 + 1) |
1da177e4 LT |
41 | |
42 | static char *strL2State[] = | |
43 | { | |
44 | "ST_L2_1", | |
45 | "ST_L2_2", | |
46 | "ST_L2_3", | |
47 | "ST_L2_4", | |
48 | "ST_L2_5", | |
49 | "ST_L2_6", | |
50 | "ST_L2_7", | |
51 | "ST_L2_8", | |
52 | }; | |
53 | ||
54 | enum { | |
55 | EV_L2_UI, | |
56 | EV_L2_SABME, | |
57 | EV_L2_DISC, | |
58 | EV_L2_DM, | |
59 | EV_L2_UA, | |
60 | EV_L2_FRMR, | |
61 | EV_L2_SUPER, | |
62 | EV_L2_I, | |
63 | EV_L2_DL_DATA, | |
64 | EV_L2_ACK_PULL, | |
65 | EV_L2_DL_UNIT_DATA, | |
66 | EV_L2_DL_ESTABLISH_REQ, | |
67 | EV_L2_DL_RELEASE_REQ, | |
68 | EV_L2_MDL_ASSIGN, | |
69 | EV_L2_MDL_REMOVE, | |
70 | EV_L2_MDL_ERROR, | |
71 | EV_L1_DEACTIVATE, | |
72 | EV_L2_T200, | |
73 | EV_L2_T203, | |
74 | EV_L2_SET_OWN_BUSY, | |
75 | EV_L2_CLEAR_OWN_BUSY, | |
76 | EV_L2_FRAME_ERROR, | |
77 | }; | |
78 | ||
475be4d8 | 79 | #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR + 1) |
1da177e4 LT |
80 | |
81 | static char *strL2Event[] = | |
82 | { | |
83 | "EV_L2_UI", | |
84 | "EV_L2_SABME", | |
85 | "EV_L2_DISC", | |
86 | "EV_L2_DM", | |
87 | "EV_L2_UA", | |
88 | "EV_L2_FRMR", | |
89 | "EV_L2_SUPER", | |
90 | "EV_L2_I", | |
91 | "EV_L2_DL_DATA", | |
92 | "EV_L2_ACK_PULL", | |
93 | "EV_L2_DL_UNIT_DATA", | |
94 | "EV_L2_DL_ESTABLISH_REQ", | |
95 | "EV_L2_DL_RELEASE_REQ", | |
96 | "EV_L2_MDL_ASSIGN", | |
97 | "EV_L2_MDL_REMOVE", | |
98 | "EV_L2_MDL_ERROR", | |
99 | "EV_L1_DEACTIVATE", | |
100 | "EV_L2_T200", | |
101 | "EV_L2_T203", | |
102 | "EV_L2_SET_OWN_BUSY", | |
103 | "EV_L2_CLEAR_OWN_BUSY", | |
104 | "EV_L2_FRAME_ERROR", | |
105 | }; | |
106 | ||
107 | static int l2addrsize(struct Layer2 *l2); | |
108 | ||
109 | static void | |
110 | set_peer_busy(struct Layer2 *l2) { | |
111 | test_and_set_bit(FLG_PEER_BUSY, &l2->flag); | |
b03efcfb DM |
112 | if (!skb_queue_empty(&l2->i_queue) || |
113 | !skb_queue_empty(&l2->ui_queue)) | |
1da177e4 LT |
114 | test_and_set_bit(FLG_L2BLOCK, &l2->flag); |
115 | } | |
116 | ||
117 | static void | |
118 | clear_peer_busy(struct Layer2 *l2) { | |
119 | if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag)) | |
120 | test_and_clear_bit(FLG_L2BLOCK, &l2->flag); | |
121 | } | |
122 | ||
123 | static void | |
124 | InitWin(struct Layer2 *l2) | |
125 | { | |
126 | int i; | |
127 | ||
128 | for (i = 0; i < MAX_WINDOW; i++) | |
129 | l2->windowar[i] = NULL; | |
130 | } | |
131 | ||
132 | static int | |
133 | freewin1(struct Layer2 *l2) | |
134 | { | |
135 | int i, cnt = 0; | |
136 | ||
137 | for (i = 0; i < MAX_WINDOW; i++) { | |
138 | if (l2->windowar[i]) { | |
139 | cnt++; | |
140 | dev_kfree_skb(l2->windowar[i]); | |
141 | l2->windowar[i] = NULL; | |
142 | } | |
143 | } | |
144 | return cnt; | |
145 | } | |
146 | ||
672c3fd9 | 147 | static inline void |
1da177e4 LT |
148 | freewin(struct PStack *st) |
149 | { | |
150 | freewin1(&st->l2); | |
151 | } | |
152 | ||
153 | static void | |
154 | ReleaseWin(struct Layer2 *l2) | |
155 | { | |
156 | int cnt; | |
157 | ||
475be4d8 | 158 | if ((cnt = freewin1(l2))) |
1da177e4 LT |
159 | printk(KERN_WARNING "isdl2 freed %d skbuffs in release\n", cnt); |
160 | } | |
161 | ||
672c3fd9 | 162 | static inline unsigned int |
1da177e4 LT |
163 | cansend(struct PStack *st) |
164 | { | |
165 | unsigned int p1; | |
166 | ||
475be4d8 | 167 | if (test_bit(FLG_MOD128, &st->l2.flag)) |
1da177e4 LT |
168 | p1 = (st->l2.vs - st->l2.va) % 128; |
169 | else | |
170 | p1 = (st->l2.vs - st->l2.va) % 8; | |
171 | return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag)); | |
172 | } | |
173 | ||
672c3fd9 | 174 | static inline void |
1da177e4 LT |
175 | clear_exception(struct Layer2 *l2) |
176 | { | |
177 | test_and_clear_bit(FLG_ACK_PEND, &l2->flag); | |
178 | test_and_clear_bit(FLG_REJEXC, &l2->flag); | |
179 | test_and_clear_bit(FLG_OWN_BUSY, &l2->flag); | |
180 | clear_peer_busy(l2); | |
181 | } | |
182 | ||
672c3fd9 | 183 | static inline int |
1da177e4 LT |
184 | l2headersize(struct Layer2 *l2, int ui) |
185 | { | |
186 | return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) + | |
187 | (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1)); | |
188 | } | |
189 | ||
190 | inline int | |
191 | l2addrsize(struct Layer2 *l2) | |
192 | { | |
193 | return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1); | |
194 | } | |
195 | ||
196 | static int | |
475be4d8 | 197 | sethdraddr(struct Layer2 *l2, u_char *header, int rsp) |
1da177e4 LT |
198 | { |
199 | u_char *ptr = header; | |
200 | int crbit = rsp; | |
201 | ||
202 | if (test_bit(FLG_LAPD, &l2->flag)) { | |
203 | *ptr++ = (l2->sap << 2) | (rsp ? 2 : 0); | |
204 | *ptr++ = (l2->tei << 1) | 1; | |
205 | return (2); | |
206 | } else { | |
207 | if (test_bit(FLG_ORIG, &l2->flag)) | |
208 | crbit = !crbit; | |
209 | if (crbit) | |
210 | *ptr++ = 1; | |
211 | else | |
212 | *ptr++ = 3; | |
213 | return (1); | |
214 | } | |
215 | } | |
216 | ||
77933d72 | 217 | static inline void |
1da177e4 LT |
218 | enqueue_super(struct PStack *st, |
219 | struct sk_buff *skb) | |
220 | { | |
221 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
222 | st->l1.bcs->tx_cnt += skb->len; | |
223 | st->l2.l2l1(st, PH_DATA | REQUEST, skb); | |
224 | } | |
225 | ||
226 | #define enqueue_ui(a, b) enqueue_super(a, b) | |
227 | ||
672c3fd9 | 228 | static inline int |
475be4d8 | 229 | IsUI(u_char *data) |
1da177e4 LT |
230 | { |
231 | return ((data[0] & 0xef) == UI); | |
232 | } | |
233 | ||
672c3fd9 | 234 | static inline int |
475be4d8 | 235 | IsUA(u_char *data) |
1da177e4 LT |
236 | { |
237 | return ((data[0] & 0xef) == UA); | |
238 | } | |
239 | ||
672c3fd9 | 240 | static inline int |
475be4d8 | 241 | IsDM(u_char *data) |
1da177e4 LT |
242 | { |
243 | return ((data[0] & 0xef) == DM); | |
244 | } | |
245 | ||
672c3fd9 | 246 | static inline int |
475be4d8 | 247 | IsDISC(u_char *data) |
1da177e4 LT |
248 | { |
249 | return ((data[0] & 0xef) == DISC); | |
250 | } | |
251 | ||
672c3fd9 | 252 | static inline int |
475be4d8 | 253 | IsSFrame(u_char *data, struct PStack *st) |
1da177e4 LT |
254 | { |
255 | register u_char d = *data; | |
475be4d8 | 256 | |
1da177e4 LT |
257 | if (!test_bit(FLG_MOD128, &st->l2.flag)) |
258 | d &= 0xf; | |
475be4d8 | 259 | return (((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c)); |
1da177e4 LT |
260 | } |
261 | ||
672c3fd9 | 262 | static inline int |
475be4d8 | 263 | IsSABME(u_char *data, struct PStack *st) |
1da177e4 LT |
264 | { |
265 | u_char d = data[0] & ~0x10; | |
266 | ||
267 | return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM); | |
268 | } | |
269 | ||
672c3fd9 | 270 | static inline int |
475be4d8 | 271 | IsREJ(u_char *data, struct PStack *st) |
1da177e4 LT |
272 | { |
273 | return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ); | |
274 | } | |
275 | ||
672c3fd9 | 276 | static inline int |
475be4d8 | 277 | IsFRMR(u_char *data) |
1da177e4 LT |
278 | { |
279 | return ((data[0] & 0xef) == FRMR); | |
280 | } | |
281 | ||
672c3fd9 | 282 | static inline int |
475be4d8 | 283 | IsRNR(u_char *data, struct PStack *st) |
1da177e4 LT |
284 | { |
285 | return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR); | |
286 | } | |
287 | ||
672c3fd9 | 288 | static int |
1da177e4 LT |
289 | iframe_error(struct PStack *st, struct sk_buff *skb) |
290 | { | |
291 | int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1); | |
292 | int rsp = *skb->data & 0x2; | |
293 | ||
294 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
295 | rsp = !rsp; | |
296 | ||
297 | if (rsp) | |
298 | return 'L'; | |
299 | ||
300 | ||
301 | if (skb->len < i) | |
302 | return 'N'; | |
303 | ||
304 | if ((skb->len - i) > st->l2.maxlen) | |
305 | return 'O'; | |
306 | ||
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
672c3fd9 | 311 | static int |
1da177e4 LT |
312 | super_error(struct PStack *st, struct sk_buff *skb) |
313 | { | |
314 | if (skb->len != l2addrsize(&st->l2) + | |
315 | (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1)) | |
316 | return 'N'; | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
672c3fd9 | 321 | static int |
1da177e4 LT |
322 | unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp) |
323 | { | |
324 | int rsp = (*skb->data & 0x2) >> 1; | |
325 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
326 | rsp = !rsp; | |
327 | ||
328 | if (rsp != wantrsp) | |
329 | return 'L'; | |
330 | ||
331 | if (skb->len != l2addrsize(&st->l2) + 1) | |
332 | return 'N'; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
672c3fd9 | 337 | static int |
1da177e4 LT |
338 | UI_error(struct PStack *st, struct sk_buff *skb) |
339 | { | |
340 | int rsp = *skb->data & 0x2; | |
341 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
342 | rsp = !rsp; | |
343 | ||
344 | if (rsp) | |
345 | return 'L'; | |
346 | ||
347 | if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1) | |
348 | return 'O'; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
672c3fd9 | 353 | static int |
1da177e4 LT |
354 | FRMR_error(struct PStack *st, struct sk_buff *skb) |
355 | { | |
356 | int headers = l2addrsize(&st->l2) + 1; | |
357 | u_char *datap = skb->data + headers; | |
358 | int rsp = *skb->data & 0x2; | |
359 | ||
360 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
361 | rsp = !rsp; | |
362 | ||
363 | if (!rsp) | |
364 | return 'L'; | |
365 | ||
366 | if (test_bit(FLG_MOD128, &st->l2.flag)) { | |
367 | if (skb->len < headers + 5) | |
368 | return 'N'; | |
369 | else | |
370 | l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x", | |
475be4d8 JP |
371 | datap[0], datap[1], datap[2], |
372 | datap[3], datap[4]); | |
1da177e4 LT |
373 | } else { |
374 | if (skb->len < headers + 3) | |
375 | return 'N'; | |
376 | else | |
377 | l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x", | |
475be4d8 | 378 | datap[0], datap[1], datap[2]); |
1da177e4 LT |
379 | } |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static unsigned int | |
385 | legalnr(struct PStack *st, unsigned int nr) | |
386 | { | |
475be4d8 | 387 | struct Layer2 *l2 = &st->l2; |
1da177e4 | 388 | |
475be4d8 | 389 | if (test_bit(FLG_MOD128, &l2->flag)) |
1da177e4 LT |
390 | return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128); |
391 | else | |
392 | return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8); | |
393 | } | |
394 | ||
395 | static void | |
396 | setva(struct PStack *st, unsigned int nr) | |
397 | { | |
398 | struct Layer2 *l2 = &st->l2; | |
399 | int len; | |
400 | u_long flags; | |
401 | ||
402 | spin_lock_irqsave(&l2->lock, flags); | |
403 | while (l2->va != nr) { | |
404 | (l2->va)++; | |
475be4d8 | 405 | if (test_bit(FLG_MOD128, &l2->flag)) |
1da177e4 LT |
406 | l2->va %= 128; |
407 | else | |
408 | l2->va %= 8; | |
409 | len = l2->windowar[l2->sow]->len; | |
410 | if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type) | |
411 | len = -1; | |
412 | dev_kfree_skb(l2->windowar[l2->sow]); | |
413 | l2->windowar[l2->sow] = NULL; | |
414 | l2->sow = (l2->sow + 1) % l2->window; | |
415 | spin_unlock_irqrestore(&l2->lock, flags); | |
475be4d8 | 416 | if (test_bit(FLG_LLI_L2WAKEUP, &st->lli.flag) && (len >= 0)) |
1da177e4 LT |
417 | lli_writewakeup(st, len); |
418 | spin_lock_irqsave(&l2->lock, flags); | |
419 | } | |
420 | spin_unlock_irqrestore(&l2->lock, flags); | |
421 | } | |
422 | ||
423 | static void | |
424 | send_uframe(struct PStack *st, u_char cmd, u_char cr) | |
425 | { | |
426 | struct sk_buff *skb; | |
427 | u_char tmp[MAX_HEADER_LEN]; | |
428 | int i; | |
429 | ||
430 | i = sethdraddr(&st->l2, tmp, cr); | |
431 | tmp[i++] = cmd; | |
432 | if (!(skb = alloc_skb(i, GFP_ATOMIC))) { | |
433 | printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframe\n"); | |
434 | return; | |
435 | } | |
59ae1d12 | 436 | skb_put_data(skb, tmp, i); |
1da177e4 LT |
437 | enqueue_super(st, skb); |
438 | } | |
439 | ||
672c3fd9 | 440 | static inline u_char |
475be4d8 | 441 | get_PollFlag(struct PStack *st, struct sk_buff *skb) |
1da177e4 LT |
442 | { |
443 | return (skb->data[l2addrsize(&(st->l2))] & 0x10); | |
444 | } | |
445 | ||
672c3fd9 | 446 | static inline u_char |
1da177e4 LT |
447 | get_PollFlagFree(struct PStack *st, struct sk_buff *skb) |
448 | { | |
449 | u_char PF; | |
450 | ||
451 | PF = get_PollFlag(st, skb); | |
672c3fd9 | 452 | dev_kfree_skb(skb); |
1da177e4 LT |
453 | return (PF); |
454 | } | |
455 | ||
672c3fd9 | 456 | static inline void |
1da177e4 LT |
457 | start_t200(struct PStack *st, int i) |
458 | { | |
459 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i); | |
460 | test_and_set_bit(FLG_T200_RUN, &st->l2.flag); | |
461 | } | |
462 | ||
672c3fd9 | 463 | static inline void |
1da177e4 LT |
464 | restart_t200(struct PStack *st, int i) |
465 | { | |
466 | FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i); | |
467 | test_and_set_bit(FLG_T200_RUN, &st->l2.flag); | |
468 | } | |
469 | ||
672c3fd9 | 470 | static inline void |
1da177e4 LT |
471 | stop_t200(struct PStack *st, int i) |
472 | { | |
475be4d8 | 473 | if (test_and_clear_bit(FLG_T200_RUN, &st->l2.flag)) |
1da177e4 LT |
474 | FsmDelTimer(&st->l2.t200, i); |
475 | } | |
476 | ||
672c3fd9 | 477 | static inline void |
1da177e4 LT |
478 | st5_dl_release_l2l3(struct PStack *st) |
479 | { | |
475be4d8 | 480 | int pr; |
1da177e4 | 481 | |
475be4d8 JP |
482 | if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag)) |
483 | pr = DL_RELEASE | CONFIRM; | |
484 | else | |
485 | pr = DL_RELEASE | INDICATION; | |
1da177e4 | 486 | |
475be4d8 | 487 | st->l2.l2l3(st, pr, NULL); |
1da177e4 LT |
488 | } |
489 | ||
672c3fd9 | 490 | static inline void |
1da177e4 LT |
491 | lapb_dl_release_l2l3(struct PStack *st, int f) |
492 | { | |
475be4d8 JP |
493 | if (test_bit(FLG_LAPB, &st->l2.flag)) |
494 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
495 | st->l2.l2l3(st, DL_RELEASE | f, NULL); | |
1da177e4 LT |
496 | } |
497 | ||
498 | static void | |
499 | establishlink(struct FsmInst *fi) | |
500 | { | |
501 | struct PStack *st = fi->userdata; | |
502 | u_char cmd; | |
503 | ||
504 | clear_exception(&st->l2); | |
505 | st->l2.rc = 0; | |
506 | cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10; | |
507 | send_uframe(st, cmd, CMD); | |
508 | FsmDelTimer(&st->l2.t203, 1); | |
509 | restart_t200(st, 1); | |
510 | test_and_clear_bit(FLG_PEND_REL, &st->l2.flag); | |
511 | freewin(st); | |
512 | FsmChangeState(fi, ST_L2_5); | |
513 | } | |
514 | ||
515 | static void | |
516 | l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg) | |
517 | { | |
518 | struct sk_buff *skb = arg; | |
519 | struct PStack *st = fi->userdata; | |
520 | ||
521 | if (get_PollFlagFree(st, skb)) | |
522 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C'); | |
523 | else | |
524 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D'); | |
525 | } | |
526 | ||
527 | static void | |
528 | l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg) | |
529 | { | |
530 | struct sk_buff *skb = arg; | |
531 | struct PStack *st = fi->userdata; | |
532 | ||
533 | if (get_PollFlagFree(st, skb)) | |
534 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B'); | |
535 | else { | |
536 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E'); | |
537 | establishlink(fi); | |
538 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
539 | } | |
540 | } | |
541 | ||
542 | static void | |
543 | l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg) | |
544 | { | |
545 | struct sk_buff *skb = arg; | |
546 | struct PStack *st = fi->userdata; | |
547 | ||
548 | if (get_PollFlagFree(st, skb)) | |
549 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B'); | |
550 | else { | |
551 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E'); | |
552 | } | |
553 | establishlink(fi); | |
554 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
555 | } | |
556 | ||
557 | static void | |
558 | l2_go_st3(struct FsmInst *fi, int event, void *arg) | |
559 | { | |
475be4d8 | 560 | FsmChangeState(fi, ST_L2_3); |
1da177e4 LT |
561 | } |
562 | ||
563 | static void | |
564 | l2_mdl_assign(struct FsmInst *fi, int event, void *arg) | |
565 | { | |
566 | struct PStack *st = fi->userdata; | |
567 | ||
475be4d8 | 568 | FsmChangeState(fi, ST_L2_3); |
1da177e4 LT |
569 | st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL); |
570 | } | |
571 | ||
572 | static void | |
573 | l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg) | |
574 | { | |
575 | struct PStack *st = fi->userdata; | |
576 | struct sk_buff *skb = arg; | |
577 | ||
578 | skb_queue_tail(&st->l2.ui_queue, skb); | |
579 | FsmChangeState(fi, ST_L2_2); | |
580 | st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL); | |
581 | } | |
582 | ||
583 | static void | |
584 | l2_queue_ui(struct FsmInst *fi, int event, void *arg) | |
585 | { | |
586 | struct PStack *st = fi->userdata; | |
587 | struct sk_buff *skb = arg; | |
588 | ||
589 | skb_queue_tail(&st->l2.ui_queue, skb); | |
590 | } | |
591 | ||
592 | static void | |
593 | tx_ui(struct PStack *st) | |
594 | { | |
595 | struct sk_buff *skb; | |
596 | u_char header[MAX_HEADER_LEN]; | |
597 | int i; | |
598 | ||
599 | i = sethdraddr(&(st->l2), header, CMD); | |
600 | header[i++] = UI; | |
601 | while ((skb = skb_dequeue(&st->l2.ui_queue))) { | |
602 | memcpy(skb_push(skb, i), header, i); | |
603 | enqueue_ui(st, skb); | |
604 | } | |
605 | } | |
606 | ||
607 | static void | |
608 | l2_send_ui(struct FsmInst *fi, int event, void *arg) | |
609 | { | |
610 | struct PStack *st = fi->userdata; | |
611 | struct sk_buff *skb = arg; | |
612 | ||
613 | skb_queue_tail(&st->l2.ui_queue, skb); | |
614 | tx_ui(st); | |
615 | } | |
616 | ||
617 | static void | |
618 | l2_got_ui(struct FsmInst *fi, int event, void *arg) | |
619 | { | |
620 | struct PStack *st = fi->userdata; | |
621 | struct sk_buff *skb = arg; | |
622 | ||
623 | skb_pull(skb, l2headersize(&st->l2, 1)); | |
624 | st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb); | |
625 | /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
626 | * in states 1-3 for broadcast | |
627 | */ | |
628 | ||
629 | ||
630 | } | |
631 | ||
632 | static void | |
633 | l2_establish(struct FsmInst *fi, int event, void *arg) | |
634 | { | |
635 | struct PStack *st = fi->userdata; | |
636 | ||
637 | establishlink(fi); | |
638 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
639 | } | |
640 | ||
641 | static void | |
642 | l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg) | |
643 | { | |
644 | struct PStack *st = fi->userdata; | |
645 | ||
646 | skb_queue_purge(&st->l2.i_queue); | |
647 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
648 | test_and_clear_bit(FLG_PEND_REL, &st->l2.flag); | |
649 | } | |
650 | ||
651 | static void | |
652 | l2_l3_reestablish(struct FsmInst *fi, int event, void *arg) | |
653 | { | |
654 | struct PStack *st = fi->userdata; | |
655 | ||
656 | skb_queue_purge(&st->l2.i_queue); | |
657 | establishlink(fi); | |
658 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
659 | } | |
660 | ||
661 | static void | |
662 | l2_release(struct FsmInst *fi, int event, void *arg) | |
663 | { | |
664 | struct PStack *st = fi->userdata; | |
665 | ||
666 | st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL); | |
667 | } | |
668 | ||
669 | static void | |
670 | l2_pend_rel(struct FsmInst *fi, int event, void *arg) | |
671 | { | |
672 | struct PStack *st = fi->userdata; | |
673 | ||
674 | test_and_set_bit(FLG_PEND_REL, &st->l2.flag); | |
675 | } | |
676 | ||
677 | static void | |
678 | l2_disconnect(struct FsmInst *fi, int event, void *arg) | |
679 | { | |
680 | struct PStack *st = fi->userdata; | |
681 | ||
682 | skb_queue_purge(&st->l2.i_queue); | |
683 | freewin(st); | |
684 | FsmChangeState(fi, ST_L2_6); | |
685 | st->l2.rc = 0; | |
686 | send_uframe(st, DISC | 0x10, CMD); | |
687 | FsmDelTimer(&st->l2.t203, 1); | |
688 | restart_t200(st, 2); | |
689 | } | |
690 | ||
691 | static void | |
692 | l2_start_multi(struct FsmInst *fi, int event, void *arg) | |
693 | { | |
694 | struct PStack *st = fi->userdata; | |
695 | struct sk_buff *skb = arg; | |
696 | ||
697 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
698 | ||
699 | clear_exception(&st->l2); | |
700 | st->l2.vs = 0; | |
701 | st->l2.va = 0; | |
702 | st->l2.vr = 0; | |
703 | st->l2.sow = 0; | |
704 | FsmChangeState(fi, ST_L2_7); | |
705 | FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3); | |
706 | ||
707 | st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL); | |
708 | } | |
709 | ||
710 | static void | |
711 | l2_send_UA(struct FsmInst *fi, int event, void *arg) | |
712 | { | |
713 | struct PStack *st = fi->userdata; | |
714 | struct sk_buff *skb = arg; | |
715 | ||
716 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
717 | } | |
718 | ||
719 | static void | |
720 | l2_send_DM(struct FsmInst *fi, int event, void *arg) | |
721 | { | |
722 | struct PStack *st = fi->userdata; | |
723 | struct sk_buff *skb = arg; | |
724 | ||
725 | send_uframe(st, DM | get_PollFlagFree(st, skb), RSP); | |
726 | } | |
727 | ||
728 | static void | |
729 | l2_restart_multi(struct FsmInst *fi, int event, void *arg) | |
730 | { | |
731 | struct PStack *st = fi->userdata; | |
732 | struct sk_buff *skb = arg; | |
733 | int est = 0, state; | |
734 | ||
735 | state = fi->state; | |
736 | ||
737 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
738 | ||
739 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F'); | |
740 | ||
741 | if (st->l2.vs != st->l2.va) { | |
742 | skb_queue_purge(&st->l2.i_queue); | |
743 | est = 1; | |
744 | } | |
745 | ||
746 | clear_exception(&st->l2); | |
747 | st->l2.vs = 0; | |
748 | st->l2.va = 0; | |
749 | st->l2.vr = 0; | |
750 | st->l2.sow = 0; | |
751 | FsmChangeState(fi, ST_L2_7); | |
752 | stop_t200(st, 3); | |
753 | FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3); | |
754 | ||
755 | if (est) | |
756 | st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL); | |
757 | ||
475be4d8 | 758 | if ((ST_L2_7 == state) || (ST_L2_8 == state)) |
b03efcfb | 759 | if (!skb_queue_empty(&st->l2.i_queue) && cansend(st)) |
1da177e4 LT |
760 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); |
761 | } | |
762 | ||
763 | static void | |
764 | l2_stop_multi(struct FsmInst *fi, int event, void *arg) | |
765 | { | |
766 | struct PStack *st = fi->userdata; | |
767 | struct sk_buff *skb = arg; | |
768 | ||
769 | FsmChangeState(fi, ST_L2_4); | |
770 | FsmDelTimer(&st->l2.t203, 3); | |
771 | stop_t200(st, 4); | |
772 | ||
773 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
774 | ||
775 | skb_queue_purge(&st->l2.i_queue); | |
776 | freewin(st); | |
777 | lapb_dl_release_l2l3(st, INDICATION); | |
778 | } | |
779 | ||
780 | static void | |
781 | l2_connected(struct FsmInst *fi, int event, void *arg) | |
782 | { | |
783 | struct PStack *st = fi->userdata; | |
784 | struct sk_buff *skb = arg; | |
475be4d8 | 785 | int pr = -1; |
1da177e4 LT |
786 | |
787 | if (!get_PollFlag(st, skb)) { | |
788 | l2_mdl_error_ua(fi, event, arg); | |
789 | return; | |
790 | } | |
672c3fd9 | 791 | dev_kfree_skb(skb); |
1da177e4 LT |
792 | |
793 | if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag)) | |
794 | l2_disconnect(fi, event, arg); | |
795 | ||
796 | if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) { | |
797 | pr = DL_ESTABLISH | CONFIRM; | |
798 | } else if (st->l2.vs != st->l2.va) { | |
799 | skb_queue_purge(&st->l2.i_queue); | |
800 | pr = DL_ESTABLISH | INDICATION; | |
801 | } | |
802 | ||
803 | stop_t200(st, 5); | |
804 | ||
805 | st->l2.vr = 0; | |
806 | st->l2.vs = 0; | |
807 | st->l2.va = 0; | |
808 | st->l2.sow = 0; | |
809 | FsmChangeState(fi, ST_L2_7); | |
810 | FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4); | |
811 | ||
812 | if (pr != -1) | |
813 | st->l2.l2l3(st, pr, NULL); | |
814 | ||
b03efcfb | 815 | if (!skb_queue_empty(&st->l2.i_queue) && cansend(st)) |
1da177e4 LT |
816 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); |
817 | } | |
818 | ||
819 | static void | |
820 | l2_released(struct FsmInst *fi, int event, void *arg) | |
821 | { | |
822 | struct PStack *st = fi->userdata; | |
823 | struct sk_buff *skb = arg; | |
824 | ||
825 | if (!get_PollFlag(st, skb)) { | |
826 | l2_mdl_error_ua(fi, event, arg); | |
827 | return; | |
828 | } | |
672c3fd9 | 829 | dev_kfree_skb(skb); |
1da177e4 LT |
830 | |
831 | stop_t200(st, 6); | |
832 | lapb_dl_release_l2l3(st, CONFIRM); | |
833 | FsmChangeState(fi, ST_L2_4); | |
834 | } | |
835 | ||
836 | static void | |
837 | l2_reestablish(struct FsmInst *fi, int event, void *arg) | |
838 | { | |
839 | struct PStack *st = fi->userdata; | |
840 | struct sk_buff *skb = arg; | |
841 | ||
842 | if (!get_PollFlagFree(st, skb)) { | |
843 | establishlink(fi); | |
844 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
845 | } | |
846 | } | |
847 | ||
848 | static void | |
849 | l2_st5_dm_release(struct FsmInst *fi, int event, void *arg) | |
850 | { | |
851 | struct PStack *st = fi->userdata; | |
852 | struct sk_buff *skb = arg; | |
853 | ||
854 | if (get_PollFlagFree(st, skb)) { | |
855 | stop_t200(st, 7); | |
475be4d8 | 856 | if (!test_bit(FLG_L3_INIT, &st->l2.flag)) |
1da177e4 LT |
857 | skb_queue_purge(&st->l2.i_queue); |
858 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
859 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
860 | st5_dl_release_l2l3(st); | |
861 | FsmChangeState(fi, ST_L2_4); | |
862 | } | |
863 | } | |
864 | ||
865 | static void | |
866 | l2_st6_dm_release(struct FsmInst *fi, int event, void *arg) | |
867 | { | |
868 | struct PStack *st = fi->userdata; | |
869 | struct sk_buff *skb = arg; | |
870 | ||
871 | if (get_PollFlagFree(st, skb)) { | |
872 | stop_t200(st, 8); | |
873 | lapb_dl_release_l2l3(st, CONFIRM); | |
874 | FsmChangeState(fi, ST_L2_4); | |
875 | } | |
876 | } | |
877 | ||
672c3fd9 | 878 | static inline void |
1da177e4 LT |
879 | enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf) |
880 | { | |
881 | struct sk_buff *skb; | |
882 | struct Layer2 *l2; | |
883 | u_char tmp[MAX_HEADER_LEN]; | |
884 | int i; | |
885 | ||
886 | l2 = &st->l2; | |
887 | i = sethdraddr(l2, tmp, cr); | |
888 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
889 | tmp[i++] = typ; | |
890 | tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0); | |
891 | } else | |
892 | tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0); | |
893 | if (!(skb = alloc_skb(i, GFP_ATOMIC))) { | |
894 | printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_cr\n"); | |
895 | return; | |
896 | } | |
59ae1d12 | 897 | skb_put_data(skb, tmp, i); |
1da177e4 LT |
898 | enqueue_super(st, skb); |
899 | } | |
900 | ||
672c3fd9 | 901 | static inline void |
1da177e4 LT |
902 | enquiry_response(struct PStack *st) |
903 | { | |
904 | if (test_bit(FLG_OWN_BUSY, &st->l2.flag)) | |
905 | enquiry_cr(st, RNR, RSP, 1); | |
906 | else | |
907 | enquiry_cr(st, RR, RSP, 1); | |
908 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
909 | } | |
910 | ||
672c3fd9 | 911 | static inline void |
1da177e4 LT |
912 | transmit_enquiry(struct PStack *st) |
913 | { | |
914 | if (test_bit(FLG_OWN_BUSY, &st->l2.flag)) | |
915 | enquiry_cr(st, RNR, CMD, 1); | |
916 | else | |
917 | enquiry_cr(st, RR, CMD, 1); | |
918 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
919 | start_t200(st, 9); | |
920 | } | |
921 | ||
922 | ||
923 | static void | |
924 | nrerrorrecovery(struct FsmInst *fi) | |
925 | { | |
926 | struct PStack *st = fi->userdata; | |
927 | ||
928 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J'); | |
929 | establishlink(fi); | |
930 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
931 | } | |
932 | ||
933 | static void | |
934 | invoke_retransmission(struct PStack *st, unsigned int nr) | |
935 | { | |
936 | struct Layer2 *l2 = &st->l2; | |
937 | u_int p1; | |
938 | u_long flags; | |
939 | ||
940 | spin_lock_irqsave(&l2->lock, flags); | |
941 | if (l2->vs != nr) { | |
942 | while (l2->vs != nr) { | |
943 | (l2->vs)--; | |
475be4d8 | 944 | if (test_bit(FLG_MOD128, &l2->flag)) { |
1da177e4 LT |
945 | l2->vs %= 128; |
946 | p1 = (l2->vs - l2->va) % 128; | |
947 | } else { | |
948 | l2->vs %= 8; | |
949 | p1 = (l2->vs - l2->va) % 8; | |
950 | } | |
951 | p1 = (p1 + l2->sow) % l2->window; | |
952 | if (test_bit(FLG_LAPB, &l2->flag)) | |
953 | st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0); | |
954 | skb_queue_head(&l2->i_queue, l2->windowar[p1]); | |
955 | l2->windowar[p1] = NULL; | |
956 | } | |
957 | spin_unlock_irqrestore(&l2->lock, flags); | |
958 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
959 | return; | |
960 | } | |
961 | spin_unlock_irqrestore(&l2->lock, flags); | |
962 | } | |
963 | ||
964 | static void | |
965 | l2_st7_got_super(struct FsmInst *fi, int event, void *arg) | |
966 | { | |
967 | struct PStack *st = fi->userdata; | |
968 | struct sk_buff *skb = arg; | |
969 | int PollFlag, rsp, typ = RR; | |
970 | unsigned int nr; | |
971 | struct Layer2 *l2 = &st->l2; | |
972 | ||
973 | rsp = *skb->data & 0x2; | |
974 | if (test_bit(FLG_ORIG, &l2->flag)) | |
975 | rsp = !rsp; | |
976 | ||
977 | skb_pull(skb, l2addrsize(l2)); | |
978 | if (IsRNR(skb->data, st)) { | |
979 | set_peer_busy(l2); | |
980 | typ = RNR; | |
981 | } else | |
982 | clear_peer_busy(l2); | |
983 | if (IsREJ(skb->data, st)) | |
984 | typ = REJ; | |
985 | ||
986 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
987 | PollFlag = (skb->data[1] & 0x1) == 0x1; | |
988 | nr = skb->data[1] >> 1; | |
989 | } else { | |
990 | PollFlag = (skb->data[0] & 0x10); | |
991 | nr = (skb->data[0] >> 5) & 0x7; | |
992 | } | |
672c3fd9 | 993 | dev_kfree_skb(skb); |
1da177e4 LT |
994 | |
995 | if (PollFlag) { | |
996 | if (rsp) | |
997 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A'); | |
998 | else | |
999 | enquiry_response(st); | |
1000 | } | |
1001 | if (legalnr(st, nr)) { | |
1002 | if (typ == REJ) { | |
1003 | setva(st, nr); | |
1004 | invoke_retransmission(st, nr); | |
1005 | stop_t200(st, 10); | |
1006 | if (FsmAddTimer(&st->l2.t203, st->l2.T203, | |
1007 | EV_L2_T203, NULL, 6)) | |
1008 | l2m_debug(&st->l2.l2m, "Restart T203 ST7 REJ"); | |
1009 | } else if ((nr == l2->vs) && (typ == RR)) { | |
1010 | setva(st, nr); | |
1011 | stop_t200(st, 11); | |
1012 | FsmRestartTimer(&st->l2.t203, st->l2.T203, | |
1013 | EV_L2_T203, NULL, 7); | |
1014 | } else if ((l2->va != nr) || (typ == RNR)) { | |
1015 | setva(st, nr); | |
475be4d8 | 1016 | if (typ != RR) FsmDelTimer(&st->l2.t203, 9); |
1da177e4 LT |
1017 | restart_t200(st, 12); |
1018 | } | |
b03efcfb | 1019 | if (!skb_queue_empty(&st->l2.i_queue) && (typ == RR)) |
1da177e4 LT |
1020 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); |
1021 | } else | |
1022 | nrerrorrecovery(fi); | |
1023 | } | |
1024 | ||
1025 | static void | |
1026 | l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg) | |
1027 | { | |
1028 | struct PStack *st = fi->userdata; | |
1029 | struct sk_buff *skb = arg; | |
1030 | ||
1031 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1032 | st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0); | |
1033 | if (!test_bit(FLG_L3_INIT, &st->l2.flag)) | |
1034 | skb_queue_tail(&st->l2.i_queue, skb); | |
1035 | else | |
672c3fd9 | 1036 | dev_kfree_skb(skb); |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | static void | |
1040 | l2_feed_i_pull(struct FsmInst *fi, int event, void *arg) | |
1041 | { | |
1042 | struct PStack *st = fi->userdata; | |
1043 | struct sk_buff *skb = arg; | |
1044 | ||
1045 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1046 | st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0); | |
1047 | skb_queue_tail(&st->l2.i_queue, skb); | |
1048 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
1049 | } | |
1050 | ||
1051 | static void | |
1052 | l2_feed_iqueue(struct FsmInst *fi, int event, void *arg) | |
1053 | { | |
1054 | struct PStack *st = fi->userdata; | |
1055 | struct sk_buff *skb = arg; | |
1056 | ||
1057 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1058 | st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0); | |
1059 | skb_queue_tail(&st->l2.i_queue, skb); | |
1060 | } | |
1061 | ||
1062 | static void | |
1063 | l2_got_iframe(struct FsmInst *fi, int event, void *arg) | |
1064 | { | |
1065 | struct PStack *st = fi->userdata; | |
1066 | struct sk_buff *skb = arg; | |
1067 | struct Layer2 *l2 = &(st->l2); | |
1068 | int PollFlag, ns, i; | |
1069 | unsigned int nr; | |
1070 | ||
1071 | i = l2addrsize(l2); | |
1072 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1073 | PollFlag = ((skb->data[i + 1] & 0x1) == 0x1); | |
1074 | ns = skb->data[i] >> 1; | |
1075 | nr = (skb->data[i + 1] >> 1) & 0x7f; | |
1076 | } else { | |
1077 | PollFlag = (skb->data[i] & 0x10); | |
1078 | ns = (skb->data[i] >> 1) & 0x7; | |
1079 | nr = (skb->data[i] >> 5) & 0x7; | |
1080 | } | |
1081 | if (test_bit(FLG_OWN_BUSY, &l2->flag)) { | |
672c3fd9 | 1082 | dev_kfree_skb(skb); |
475be4d8 | 1083 | if (PollFlag) enquiry_response(st); |
1da177e4 LT |
1084 | } else if (l2->vr == ns) { |
1085 | (l2->vr)++; | |
475be4d8 | 1086 | if (test_bit(FLG_MOD128, &l2->flag)) |
1da177e4 LT |
1087 | l2->vr %= 128; |
1088 | else | |
1089 | l2->vr %= 8; | |
1090 | test_and_clear_bit(FLG_REJEXC, &l2->flag); | |
1091 | ||
1092 | if (PollFlag) | |
1093 | enquiry_response(st); | |
1094 | else | |
1095 | test_and_set_bit(FLG_ACK_PEND, &l2->flag); | |
1096 | skb_pull(skb, l2headersize(l2, 0)); | |
1097 | st->l2.l2l3(st, DL_DATA | INDICATION, skb); | |
1098 | } else { | |
1099 | /* n(s)!=v(r) */ | |
672c3fd9 | 1100 | dev_kfree_skb(skb); |
1da177e4 LT |
1101 | if (test_and_set_bit(FLG_REJEXC, &l2->flag)) { |
1102 | if (PollFlag) | |
1103 | enquiry_response(st); | |
1104 | } else { | |
1105 | enquiry_cr(st, REJ, RSP, PollFlag); | |
1106 | test_and_clear_bit(FLG_ACK_PEND, &l2->flag); | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | if (legalnr(st, nr)) { | |
1111 | if (!test_bit(FLG_PEER_BUSY, &st->l2.flag) && (fi->state == ST_L2_7)) { | |
1112 | if (nr == st->l2.vs) { | |
1113 | stop_t200(st, 13); | |
1114 | FsmRestartTimer(&st->l2.t203, st->l2.T203, | |
1115 | EV_L2_T203, NULL, 7); | |
1116 | } else if (nr != st->l2.va) | |
1117 | restart_t200(st, 14); | |
1118 | } | |
1119 | setva(st, nr); | |
1120 | } else { | |
1121 | nrerrorrecovery(fi); | |
1122 | return; | |
1123 | } | |
1124 | ||
b03efcfb | 1125 | if (!skb_queue_empty(&st->l2.i_queue) && (fi->state == ST_L2_7)) |
1da177e4 LT |
1126 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); |
1127 | if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag)) | |
1128 | enquiry_cr(st, RR, RSP, 0); | |
1129 | } | |
1130 | ||
1131 | static void | |
1132 | l2_got_tei(struct FsmInst *fi, int event, void *arg) | |
1133 | { | |
1134 | struct PStack *st = fi->userdata; | |
1135 | ||
1136 | st->l2.tei = (long) arg; | |
1137 | ||
1138 | if (fi->state == ST_L2_3) { | |
1139 | establishlink(fi); | |
1140 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
1141 | } else | |
1142 | FsmChangeState(fi, ST_L2_4); | |
b03efcfb | 1143 | if (!skb_queue_empty(&st->l2.ui_queue)) |
1da177e4 LT |
1144 | tx_ui(st); |
1145 | } | |
1146 | ||
1147 | static void | |
1148 | l2_st5_tout_200(struct FsmInst *fi, int event, void *arg) | |
1149 | { | |
1150 | struct PStack *st = fi->userdata; | |
1151 | ||
1152 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
475be4d8 | 1153 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1154 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); |
1155 | } else if (st->l2.rc == st->l2.N200) { | |
1156 | FsmChangeState(fi, ST_L2_4); | |
1157 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1158 | skb_queue_purge(&st->l2.i_queue); | |
1159 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'G'); | |
1160 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1161 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
1162 | st5_dl_release_l2l3(st); | |
1163 | } else { | |
1164 | st->l2.rc++; | |
1165 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); | |
1166 | send_uframe(st, (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | |
1167 | | 0x10, CMD); | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | static void | |
1172 | l2_st6_tout_200(struct FsmInst *fi, int event, void *arg) | |
1173 | { | |
1174 | struct PStack *st = fi->userdata; | |
1175 | ||
1176 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
475be4d8 | 1177 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1178 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); |
1179 | } else if (st->l2.rc == st->l2.N200) { | |
1180 | FsmChangeState(fi, ST_L2_4); | |
1181 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1182 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'H'); | |
1183 | lapb_dl_release_l2l3(st, CONFIRM); | |
1184 | } else { | |
1185 | st->l2.rc++; | |
1186 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, | |
1187 | NULL, 9); | |
1188 | send_uframe(st, DISC | 0x10, CMD); | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | static void | |
1193 | l2_st7_tout_200(struct FsmInst *fi, int event, void *arg) | |
1194 | { | |
1195 | struct PStack *st = fi->userdata; | |
1196 | ||
1197 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
475be4d8 | 1198 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1199 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); |
1200 | return; | |
1201 | } | |
1202 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1203 | st->l2.rc = 0; | |
1204 | FsmChangeState(fi, ST_L2_8); | |
1205 | ||
1206 | transmit_enquiry(st); | |
1207 | st->l2.rc++; | |
1208 | } | |
1209 | ||
1210 | static void | |
1211 | l2_st8_tout_200(struct FsmInst *fi, int event, void *arg) | |
1212 | { | |
1213 | struct PStack *st = fi->userdata; | |
1214 | ||
1215 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
475be4d8 | 1216 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1217 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); |
1218 | return; | |
1219 | } | |
1220 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1221 | if (st->l2.rc == st->l2.N200) { | |
1222 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'I'); | |
1223 | establishlink(fi); | |
1224 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
1225 | } else { | |
1226 | transmit_enquiry(st); | |
1227 | st->l2.rc++; | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | static void | |
1232 | l2_st7_tout_203(struct FsmInst *fi, int event, void *arg) | |
1233 | { | |
1234 | struct PStack *st = fi->userdata; | |
1235 | ||
1236 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
475be4d8 | 1237 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1238 | FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 9); |
1239 | return; | |
1240 | } | |
1241 | FsmChangeState(fi, ST_L2_8); | |
1242 | transmit_enquiry(st); | |
1243 | st->l2.rc = 0; | |
1244 | } | |
1245 | ||
1246 | static void | |
1247 | l2_pull_iqueue(struct FsmInst *fi, int event, void *arg) | |
1248 | { | |
1249 | struct PStack *st = fi->userdata; | |
c7a7c95e | 1250 | struct sk_buff *skb, *nskb; |
1da177e4 LT |
1251 | struct Layer2 *l2 = &st->l2; |
1252 | u_char header[MAX_HEADER_LEN]; | |
c978e7bb | 1253 | int i, hdr_space_needed; |
1da177e4 LT |
1254 | int unsigned p1; |
1255 | u_long flags; | |
1256 | ||
1257 | if (!cansend(st)) | |
1258 | return; | |
1259 | ||
1260 | skb = skb_dequeue(&l2->i_queue); | |
1261 | if (!skb) | |
1262 | return; | |
1263 | ||
6d90e8f4 | 1264 | hdr_space_needed = l2headersize(l2, 0); |
c7a7c95e KK |
1265 | nskb = skb_realloc_headroom(skb, hdr_space_needed); |
1266 | if (!nskb) { | |
1267 | skb_queue_head(&l2->i_queue, skb); | |
1268 | return; | |
c978e7bb | 1269 | } |
1da177e4 | 1270 | spin_lock_irqsave(&l2->lock, flags); |
475be4d8 | 1271 | if (test_bit(FLG_MOD128, &l2->flag)) |
1da177e4 LT |
1272 | p1 = (l2->vs - l2->va) % 128; |
1273 | else | |
1274 | p1 = (l2->vs - l2->va) % 8; | |
1275 | p1 = (p1 + l2->sow) % l2->window; | |
1276 | if (l2->windowar[p1]) { | |
1277 | printk(KERN_WARNING "isdnl2 try overwrite ack queue entry %d\n", | |
1278 | p1); | |
1279 | dev_kfree_skb(l2->windowar[p1]); | |
1280 | } | |
c7a7c95e | 1281 | l2->windowar[p1] = skb; |
1da177e4 LT |
1282 | |
1283 | i = sethdraddr(&st->l2, header, CMD); | |
1284 | ||
1285 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1286 | header[i++] = l2->vs << 1; | |
1287 | header[i++] = l2->vr << 1; | |
1288 | l2->vs = (l2->vs + 1) % 128; | |
1289 | } else { | |
1290 | header[i++] = (l2->vr << 5) | (l2->vs << 1); | |
1291 | l2->vs = (l2->vs + 1) % 8; | |
1292 | } | |
1293 | spin_unlock_irqrestore(&l2->lock, flags); | |
c7a7c95e KK |
1294 | memcpy(skb_push(nskb, i), header, i); |
1295 | st->l2.l2l1(st, PH_PULL | INDICATION, nskb); | |
1da177e4 LT |
1296 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); |
1297 | if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) { | |
1298 | FsmDelTimer(&st->l2.t203, 13); | |
1299 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11); | |
1300 | } | |
b03efcfb | 1301 | if (!skb_queue_empty(&l2->i_queue) && cansend(st)) |
1da177e4 LT |
1302 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); |
1303 | } | |
1304 | ||
1305 | static void | |
1306 | l2_st8_got_super(struct FsmInst *fi, int event, void *arg) | |
1307 | { | |
1308 | struct PStack *st = fi->userdata; | |
1309 | struct sk_buff *skb = arg; | |
1310 | int PollFlag, rsp, rnr = 0; | |
1311 | unsigned int nr; | |
1312 | struct Layer2 *l2 = &st->l2; | |
1313 | ||
1314 | rsp = *skb->data & 0x2; | |
1315 | if (test_bit(FLG_ORIG, &l2->flag)) | |
1316 | rsp = !rsp; | |
1317 | ||
1318 | skb_pull(skb, l2addrsize(l2)); | |
1319 | ||
1320 | if (IsRNR(skb->data, st)) { | |
1321 | set_peer_busy(l2); | |
1322 | rnr = 1; | |
1323 | } else | |
1324 | clear_peer_busy(l2); | |
1325 | ||
1326 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1327 | PollFlag = (skb->data[1] & 0x1) == 0x1; | |
1328 | nr = skb->data[1] >> 1; | |
1329 | } else { | |
1330 | PollFlag = (skb->data[0] & 0x10); | |
1331 | nr = (skb->data[0] >> 5) & 0x7; | |
1332 | } | |
672c3fd9 | 1333 | dev_kfree_skb(skb); |
1da177e4 LT |
1334 | |
1335 | if (rsp && PollFlag) { | |
1336 | if (legalnr(st, nr)) { | |
1337 | if (rnr) { | |
1338 | restart_t200(st, 15); | |
1339 | } else { | |
1340 | stop_t200(st, 16); | |
1341 | FsmAddTimer(&l2->t203, l2->T203, | |
1342 | EV_L2_T203, NULL, 5); | |
1343 | setva(st, nr); | |
1344 | } | |
1345 | invoke_retransmission(st, nr); | |
1346 | FsmChangeState(fi, ST_L2_7); | |
b03efcfb | 1347 | if (!skb_queue_empty(&l2->i_queue) && cansend(st)) |
1da177e4 LT |
1348 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); |
1349 | } else | |
1350 | nrerrorrecovery(fi); | |
1351 | } else { | |
1352 | if (!rsp && PollFlag) | |
1353 | enquiry_response(st); | |
1354 | if (legalnr(st, nr)) { | |
1355 | setva(st, nr); | |
1356 | } else | |
1357 | nrerrorrecovery(fi); | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | static void | |
1362 | l2_got_FRMR(struct FsmInst *fi, int event, void *arg) | |
1363 | { | |
1364 | struct PStack *st = fi->userdata; | |
1365 | struct sk_buff *skb = arg; | |
1366 | ||
1367 | skb_pull(skb, l2addrsize(&st->l2) + 1); | |
1368 | ||
1369 | if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */ | |
1370 | (IsUA(skb->data) && (fi->state == ST_L2_7))) { | |
1371 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K'); | |
1372 | establishlink(fi); | |
1373 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
1374 | } | |
672c3fd9 | 1375 | dev_kfree_skb(skb); |
1da177e4 LT |
1376 | } |
1377 | ||
1378 | static void | |
1379 | l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1380 | { | |
1381 | struct PStack *st = fi->userdata; | |
1382 | ||
1383 | skb_queue_purge(&st->l2.ui_queue); | |
1384 | st->l2.tei = -1; | |
1385 | FsmChangeState(fi, ST_L2_1); | |
1386 | } | |
1387 | ||
1388 | static void | |
1389 | l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1390 | { | |
1391 | struct PStack *st = fi->userdata; | |
1392 | ||
1393 | skb_queue_purge(&st->l2.ui_queue); | |
1394 | st->l2.tei = -1; | |
1395 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1396 | FsmChangeState(fi, ST_L2_1); | |
1397 | } | |
1398 | ||
1399 | static void | |
1400 | l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1401 | { | |
1402 | struct PStack *st = fi->userdata; | |
1403 | ||
1404 | skb_queue_purge(&st->l2.i_queue); | |
1405 | skb_queue_purge(&st->l2.ui_queue); | |
1406 | freewin(st); | |
1407 | st->l2.tei = -1; | |
1408 | stop_t200(st, 17); | |
1409 | st5_dl_release_l2l3(st); | |
1410 | FsmChangeState(fi, ST_L2_1); | |
1411 | } | |
1412 | ||
1413 | static void | |
1414 | l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1415 | { | |
1416 | struct PStack *st = fi->userdata; | |
1417 | ||
1418 | skb_queue_purge(&st->l2.ui_queue); | |
1419 | st->l2.tei = -1; | |
1420 | stop_t200(st, 18); | |
1421 | st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL); | |
1422 | FsmChangeState(fi, ST_L2_1); | |
1423 | } | |
1424 | ||
1425 | static void | |
1426 | l2_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1427 | { | |
1428 | struct PStack *st = fi->userdata; | |
1429 | ||
1430 | skb_queue_purge(&st->l2.i_queue); | |
1431 | skb_queue_purge(&st->l2.ui_queue); | |
1432 | freewin(st); | |
1433 | st->l2.tei = -1; | |
1434 | stop_t200(st, 17); | |
1435 | FsmDelTimer(&st->l2.t203, 19); | |
1436 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1437 | FsmChangeState(fi, ST_L2_1); | |
1438 | } | |
1439 | ||
1440 | static void | |
6b44d4e6 | 1441 | l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg) |
1da177e4 LT |
1442 | { |
1443 | struct PStack *st = fi->userdata; | |
475be4d8 | 1444 | |
1da177e4 LT |
1445 | skb_queue_purge(&st->l2.i_queue); |
1446 | skb_queue_purge(&st->l2.ui_queue); | |
1447 | if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag)) | |
1448 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1449 | } | |
1450 | ||
1451 | static void | |
6b44d4e6 | 1452 | l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg) |
1da177e4 LT |
1453 | { |
1454 | struct PStack *st = fi->userdata; | |
1455 | ||
1456 | skb_queue_purge(&st->l2.i_queue); | |
1457 | skb_queue_purge(&st->l2.ui_queue); | |
1458 | freewin(st); | |
1459 | stop_t200(st, 19); | |
1460 | st5_dl_release_l2l3(st); | |
1461 | FsmChangeState(fi, ST_L2_4); | |
1462 | } | |
1463 | ||
1464 | static void | |
6b44d4e6 | 1465 | l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg) |
1da177e4 LT |
1466 | { |
1467 | struct PStack *st = fi->userdata; | |
1468 | ||
1469 | skb_queue_purge(&st->l2.ui_queue); | |
1470 | stop_t200(st, 20); | |
1471 | st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL); | |
1472 | FsmChangeState(fi, ST_L2_4); | |
1473 | } | |
1474 | ||
1475 | static void | |
6b44d4e6 | 1476 | l2_persistent_da(struct FsmInst *fi, int event, void *arg) |
1da177e4 LT |
1477 | { |
1478 | struct PStack *st = fi->userdata; | |
1479 | ||
1480 | skb_queue_purge(&st->l2.i_queue); | |
1481 | skb_queue_purge(&st->l2.ui_queue); | |
1482 | freewin(st); | |
1483 | stop_t200(st, 19); | |
1484 | FsmDelTimer(&st->l2.t203, 19); | |
1485 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1486 | FsmChangeState(fi, ST_L2_4); | |
1487 | } | |
1488 | ||
1489 | static void | |
1490 | l2_set_own_busy(struct FsmInst *fi, int event, void *arg) | |
1491 | { | |
1492 | struct PStack *st = fi->userdata; | |
1493 | ||
475be4d8 | 1494 | if (!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1495 | enquiry_cr(st, RNR, RSP, 0); |
1496 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
1497 | } | |
1498 | } | |
1499 | ||
1500 | static void | |
1501 | l2_clear_own_busy(struct FsmInst *fi, int event, void *arg) | |
1502 | { | |
1503 | struct PStack *st = fi->userdata; | |
1504 | ||
475be4d8 | 1505 | if (!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) { |
1da177e4 LT |
1506 | enquiry_cr(st, RR, RSP, 0); |
1507 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | static void | |
1512 | l2_frame_error(struct FsmInst *fi, int event, void *arg) | |
1513 | { | |
1514 | struct PStack *st = fi->userdata; | |
1515 | ||
1516 | st->ma.layer(st, MDL_ERROR | INDICATION, arg); | |
1517 | } | |
1518 | ||
1519 | static void | |
1520 | l2_frame_error_reest(struct FsmInst *fi, int event, void *arg) | |
1521 | { | |
1522 | struct PStack *st = fi->userdata; | |
1523 | ||
1524 | st->ma.layer(st, MDL_ERROR | INDICATION, arg); | |
1525 | establishlink(fi); | |
1526 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
1527 | } | |
1528 | ||
1529 | static struct FsmNode L2FnList[] __initdata = | |
1530 | { | |
1531 | {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign}, | |
1532 | {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3}, | |
1533 | {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish}, | |
1534 | {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3}, | |
1535 | {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish}, | |
1536 | {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish}, | |
1537 | {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release}, | |
1538 | {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel}, | |
1539 | {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect}, | |
1540 | {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect}, | |
1541 | {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest}, | |
1542 | {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull}, | |
1543 | {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue}, | |
1544 | {ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign}, | |
1545 | {ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui}, | |
1546 | {ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui}, | |
1547 | {ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1548 | {ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1549 | {ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1550 | {ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1551 | {ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1552 | {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei}, | |
1553 | {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei}, | |
1554 | {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei}, | |
1555 | {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove}, | |
1556 | {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove}, | |
1557 | {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove}, | |
1558 | {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove}, | |
1559 | {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove}, | |
1560 | {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove}, | |
1561 | {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove}, | |
1562 | {ST_L2_4, EV_L2_SABME, l2_start_multi}, | |
1563 | {ST_L2_5, EV_L2_SABME, l2_send_UA}, | |
1564 | {ST_L2_6, EV_L2_SABME, l2_send_DM}, | |
1565 | {ST_L2_7, EV_L2_SABME, l2_restart_multi}, | |
1566 | {ST_L2_8, EV_L2_SABME, l2_restart_multi}, | |
1567 | {ST_L2_4, EV_L2_DISC, l2_send_DM}, | |
1568 | {ST_L2_5, EV_L2_DISC, l2_send_DM}, | |
1569 | {ST_L2_6, EV_L2_DISC, l2_send_UA}, | |
1570 | {ST_L2_7, EV_L2_DISC, l2_stop_multi}, | |
1571 | {ST_L2_8, EV_L2_DISC, l2_stop_multi}, | |
1572 | {ST_L2_4, EV_L2_UA, l2_mdl_error_ua}, | |
1573 | {ST_L2_5, EV_L2_UA, l2_connected}, | |
1574 | {ST_L2_6, EV_L2_UA, l2_released}, | |
1575 | {ST_L2_7, EV_L2_UA, l2_mdl_error_ua}, | |
1576 | {ST_L2_8, EV_L2_UA, l2_mdl_error_ua}, | |
1577 | {ST_L2_4, EV_L2_DM, l2_reestablish}, | |
1578 | {ST_L2_5, EV_L2_DM, l2_st5_dm_release}, | |
1579 | {ST_L2_6, EV_L2_DM, l2_st6_dm_release}, | |
1580 | {ST_L2_7, EV_L2_DM, l2_mdl_error_dm}, | |
1581 | {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm}, | |
1582 | {ST_L2_1, EV_L2_UI, l2_got_ui}, | |
1583 | {ST_L2_2, EV_L2_UI, l2_got_ui}, | |
1584 | {ST_L2_3, EV_L2_UI, l2_got_ui}, | |
1585 | {ST_L2_4, EV_L2_UI, l2_got_ui}, | |
1586 | {ST_L2_5, EV_L2_UI, l2_got_ui}, | |
1587 | {ST_L2_6, EV_L2_UI, l2_got_ui}, | |
1588 | {ST_L2_7, EV_L2_UI, l2_got_ui}, | |
1589 | {ST_L2_8, EV_L2_UI, l2_got_ui}, | |
1590 | {ST_L2_7, EV_L2_FRMR, l2_got_FRMR}, | |
1591 | {ST_L2_8, EV_L2_FRMR, l2_got_FRMR}, | |
1592 | {ST_L2_7, EV_L2_SUPER, l2_st7_got_super}, | |
1593 | {ST_L2_8, EV_L2_SUPER, l2_st8_got_super}, | |
1594 | {ST_L2_7, EV_L2_I, l2_got_iframe}, | |
1595 | {ST_L2_8, EV_L2_I, l2_got_iframe}, | |
1596 | {ST_L2_5, EV_L2_T200, l2_st5_tout_200}, | |
1597 | {ST_L2_6, EV_L2_T200, l2_st6_tout_200}, | |
1598 | {ST_L2_7, EV_L2_T200, l2_st7_tout_200}, | |
1599 | {ST_L2_8, EV_L2_T200, l2_st8_tout_200}, | |
1600 | {ST_L2_7, EV_L2_T203, l2_st7_tout_203}, | |
1601 | {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue}, | |
1602 | {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy}, | |
1603 | {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy}, | |
1604 | {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy}, | |
1605 | {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy}, | |
1606 | {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error}, | |
1607 | {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error}, | |
1608 | {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error}, | |
1609 | {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest}, | |
1610 | {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest}, | |
6b44d4e6 | 1611 | {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da}, |
1da177e4 LT |
1612 | {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove}, |
1613 | {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove}, | |
6b44d4e6 JE |
1614 | {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da}, |
1615 | {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da}, | |
1616 | {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da}, | |
1617 | {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da}, | |
1618 | {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da}, | |
1da177e4 LT |
1619 | }; |
1620 | ||
1da177e4 LT |
1621 | static void |
1622 | isdnl2_l1l2(struct PStack *st, int pr, void *arg) | |
1623 | { | |
1624 | struct sk_buff *skb = arg; | |
1625 | u_char *datap; | |
1626 | int ret = 1, len; | |
1627 | int c = 0; | |
1628 | ||
1629 | switch (pr) { | |
475be4d8 JP |
1630 | case (PH_DATA | INDICATION): |
1631 | datap = skb->data; | |
1632 | len = l2addrsize(&st->l2); | |
1633 | if (skb->len > len) | |
1634 | datap += len; | |
1635 | else { | |
1636 | FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N'); | |
1637 | dev_kfree_skb(skb); | |
1638 | return; | |
1639 | } | |
1640 | if (!(*datap & 1)) { /* I-Frame */ | |
1641 | if (!(c = iframe_error(st, skb))) | |
1642 | ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb); | |
1643 | } else if (IsSFrame(datap, st)) { /* S-Frame */ | |
1644 | if (!(c = super_error(st, skb))) | |
1645 | ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb); | |
1646 | } else if (IsUI(datap)) { | |
1647 | if (!(c = UI_error(st, skb))) | |
1648 | ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb); | |
1649 | } else if (IsSABME(datap, st)) { | |
1650 | if (!(c = unnum_error(st, skb, CMD))) | |
1651 | ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb); | |
1652 | } else if (IsUA(datap)) { | |
1653 | if (!(c = unnum_error(st, skb, RSP))) | |
1654 | ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb); | |
1655 | } else if (IsDISC(datap)) { | |
1656 | if (!(c = unnum_error(st, skb, CMD))) | |
1657 | ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb); | |
1658 | } else if (IsDM(datap)) { | |
1659 | if (!(c = unnum_error(st, skb, RSP))) | |
1660 | ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb); | |
1661 | } else if (IsFRMR(datap)) { | |
1662 | if (!(c = FRMR_error(st, skb))) | |
1663 | ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb); | |
1664 | } else { | |
1665 | FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L'); | |
1666 | dev_kfree_skb(skb); | |
1667 | ret = 0; | |
1668 | } | |
1669 | if (c) { | |
1670 | dev_kfree_skb(skb); | |
1671 | FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c); | |
1672 | ret = 0; | |
1673 | } | |
1674 | if (ret) | |
1675 | dev_kfree_skb(skb); | |
1676 | break; | |
1677 | case (PH_PULL | CONFIRM): | |
1678 | FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg); | |
1679 | break; | |
1680 | case (PH_PAUSE | INDICATION): | |
1681 | test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag); | |
1682 | break; | |
1683 | case (PH_PAUSE | CONFIRM): | |
1684 | test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag); | |
1685 | break; | |
1686 | case (PH_ACTIVATE | CONFIRM): | |
1687 | case (PH_ACTIVATE | INDICATION): | |
1688 | test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag); | |
1689 | if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag)) | |
1690 | FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg); | |
1691 | break; | |
1692 | case (PH_DEACTIVATE | INDICATION): | |
1693 | case (PH_DEACTIVATE | CONFIRM): | |
1694 | test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag); | |
1695 | FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg); | |
1696 | break; | |
1697 | default: | |
1698 | l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr); | |
1699 | break; | |
1da177e4 LT |
1700 | } |
1701 | } | |
1702 | ||
1703 | static void | |
1704 | isdnl2_l3l2(struct PStack *st, int pr, void *arg) | |
1705 | { | |
1706 | switch (pr) { | |
475be4d8 JP |
1707 | case (DL_DATA | REQUEST): |
1708 | if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) { | |
1709 | dev_kfree_skb((struct sk_buff *) arg); | |
1710 | } | |
1711 | break; | |
1712 | case (DL_UNIT_DATA | REQUEST): | |
1713 | if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) { | |
1714 | dev_kfree_skb((struct sk_buff *) arg); | |
1715 | } | |
1716 | break; | |
1717 | case (DL_ESTABLISH | REQUEST): | |
1718 | if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) { | |
1719 | if (test_bit(FLG_LAPD, &st->l2.flag) || | |
1720 | test_bit(FLG_ORIG, &st->l2.flag)) { | |
1721 | FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg); | |
1da177e4 | 1722 | } |
475be4d8 JP |
1723 | } else { |
1724 | if (test_bit(FLG_LAPD, &st->l2.flag) || | |
1725 | test_bit(FLG_ORIG, &st->l2.flag)) { | |
1726 | test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag); | |
1da177e4 | 1727 | } |
475be4d8 JP |
1728 | st->l2.l2l1(st, PH_ACTIVATE, NULL); |
1729 | } | |
1730 | break; | |
1731 | case (DL_RELEASE | REQUEST): | |
1732 | if (test_bit(FLG_LAPB, &st->l2.flag)) { | |
1733 | st->l2.l2l1(st, PH_DEACTIVATE, NULL); | |
1734 | } | |
1735 | FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg); | |
1736 | break; | |
1737 | case (MDL_ASSIGN | REQUEST): | |
1738 | FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg); | |
1739 | break; | |
1740 | case (MDL_REMOVE | REQUEST): | |
1741 | FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg); | |
1742 | break; | |
1743 | case (MDL_ERROR | RESPONSE): | |
1744 | FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg); | |
1745 | break; | |
1da177e4 LT |
1746 | } |
1747 | } | |
1748 | ||
1749 | void | |
1750 | releasestack_isdnl2(struct PStack *st) | |
1751 | { | |
1752 | FsmDelTimer(&st->l2.t200, 21); | |
1753 | FsmDelTimer(&st->l2.t203, 16); | |
1754 | skb_queue_purge(&st->l2.i_queue); | |
1755 | skb_queue_purge(&st->l2.ui_queue); | |
1756 | ReleaseWin(&st->l2); | |
1757 | } | |
1758 | ||
1759 | static void | |
1760 | l2m_debug(struct FsmInst *fi, char *fmt, ...) | |
1761 | { | |
1762 | va_list args; | |
1763 | struct PStack *st = fi->userdata; | |
1764 | ||
1765 | va_start(args, fmt); | |
1766 | VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args); | |
1767 | va_end(args); | |
1768 | } | |
1769 | ||
1770 | void | |
1771 | setstack_isdnl2(struct PStack *st, char *debug_id) | |
1772 | { | |
1773 | spin_lock_init(&st->l2.lock); | |
1774 | st->l1.l1l2 = isdnl2_l1l2; | |
1775 | st->l3.l3l2 = isdnl2_l3l2; | |
1776 | ||
1777 | skb_queue_head_init(&st->l2.i_queue); | |
1778 | skb_queue_head_init(&st->l2.ui_queue); | |
1779 | InitWin(&st->l2); | |
1780 | st->l2.debug = 0; | |
1781 | ||
1782 | st->l2.l2m.fsm = &l2fsm; | |
1783 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1784 | st->l2.l2m.state = ST_L2_4; | |
1785 | else | |
475be4d8 | 1786 | st->l2.l2m.state = ST_L2_1; |
1da177e4 LT |
1787 | st->l2.l2m.debug = 0; |
1788 | st->l2.l2m.userdata = st; | |
1789 | st->l2.l2m.userint = 0; | |
1790 | st->l2.l2m.printdebug = l2m_debug; | |
1791 | strcpy(st->l2.debug_id, debug_id); | |
1792 | ||
1793 | FsmInitTimer(&st->l2.l2m, &st->l2.t200); | |
1794 | FsmInitTimer(&st->l2.l2m, &st->l2.t203); | |
1795 | } | |
1796 | ||
1797 | static void | |
1798 | transl2_l3l2(struct PStack *st, int pr, void *arg) | |
1799 | { | |
1800 | switch (pr) { | |
475be4d8 JP |
1801 | case (DL_DATA | REQUEST): |
1802 | case (DL_UNIT_DATA | REQUEST): | |
1803 | st->l2.l2l1(st, PH_DATA | REQUEST, arg); | |
1804 | break; | |
1805 | case (DL_ESTABLISH | REQUEST): | |
1806 | st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL); | |
1807 | break; | |
1808 | case (DL_RELEASE | REQUEST): | |
1809 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
1810 | break; | |
1da177e4 LT |
1811 | } |
1812 | } | |
1813 | ||
1814 | void | |
1815 | setstack_transl2(struct PStack *st) | |
1816 | { | |
1817 | st->l3.l3l2 = transl2_l3l2; | |
1818 | } | |
1819 | ||
1820 | void | |
1821 | releasestack_transl2(struct PStack *st) | |
1822 | { | |
1823 | } | |
1824 | ||
1825 | int __init | |
1826 | Isdnl2New(void) | |
1827 | { | |
1828 | l2fsm.state_count = L2_STATE_COUNT; | |
1829 | l2fsm.event_count = L2_EVENT_COUNT; | |
1830 | l2fsm.strEvent = strL2Event; | |
1831 | l2fsm.strState = strL2State; | |
ba2d6ccb | 1832 | return FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList)); |
1da177e4 LT |
1833 | } |
1834 | ||
1835 | void | |
1836 | Isdnl2Free(void) | |
1837 | { | |
1838 | FsmFree(&l2fsm); | |
1839 | } |