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1da177e4 LT |
1 | /* |
2 | * LAPB release 002 | |
3 | * | |
4 | * This code REQUIRES 2.1.15 or higher/ NET3.038 | |
5 | * | |
6 | * This module: | |
7 | * This module is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * History | |
13 | * LAPB 001 Jonathan Naulor Started Coding | |
14 | * LAPB 002 Jonathan Naylor New timer architecture. | |
15 | * 2000-10-29 Henner Eisen lapb_data_indication() return status. | |
16 | */ | |
17 | ||
18 | #include <linux/errno.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/in.h> | |
22 | #include <linux/kernel.h> | |
1da177e4 LT |
23 | #include <linux/timer.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/inet.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/skbuff.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 LT |
31 | #include <net/sock.h> |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <net/lapb.h> | |
38 | ||
39 | /* | |
40 | * State machine for state 0, Disconnected State. | |
41 | * The handling of the timer(s) is in file lapb_timer.c. | |
42 | */ | |
43 | static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
44 | struct lapb_frame *frame) | |
45 | { | |
46 | switch (frame->type) { | |
fcb261f3 | 47 | case LAPB_SABM: |
1da177e4 | 48 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
49 | printk(KERN_DEBUG "lapb: (%p) S0 RX SABM(%d)\n", |
50 | lapb->dev, frame->pf); | |
1da177e4 | 51 | #endif |
fcb261f3 | 52 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 53 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
54 | printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", |
55 | lapb->dev, frame->pf); | |
1da177e4 | 56 | #endif |
fcb261f3 JP |
57 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
58 | LAPB_RESPONSE); | |
59 | } else { | |
1da177e4 | 60 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
61 | printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", |
62 | lapb->dev, frame->pf); | |
1da177e4 LT |
63 | #endif |
64 | #if LAPB_DEBUG > 0 | |
fcb261f3 | 65 | printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", lapb->dev); |
1da177e4 | 66 | #endif |
fcb261f3 JP |
67 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
68 | LAPB_RESPONSE); | |
69 | lapb_stop_t1timer(lapb); | |
70 | lapb_stop_t2timer(lapb); | |
71 | lapb->state = LAPB_STATE_3; | |
72 | lapb->condition = 0x00; | |
73 | lapb->n2count = 0; | |
74 | lapb->vs = 0; | |
75 | lapb->vr = 0; | |
76 | lapb->va = 0; | |
77 | lapb_connect_indication(lapb, LAPB_OK); | |
78 | } | |
79 | break; | |
1da177e4 | 80 | |
fcb261f3 | 81 | case LAPB_SABME: |
1da177e4 | 82 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
83 | printk(KERN_DEBUG "lapb: (%p) S0 RX SABME(%d)\n", |
84 | lapb->dev, frame->pf); | |
1da177e4 | 85 | #endif |
fcb261f3 | 86 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 87 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
88 | printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", |
89 | lapb->dev, frame->pf); | |
1da177e4 LT |
90 | #endif |
91 | #if LAPB_DEBUG > 0 | |
fcb261f3 | 92 | printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", lapb->dev); |
1da177e4 | 93 | #endif |
fcb261f3 JP |
94 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
95 | LAPB_RESPONSE); | |
96 | lapb_stop_t1timer(lapb); | |
97 | lapb_stop_t2timer(lapb); | |
98 | lapb->state = LAPB_STATE_3; | |
99 | lapb->condition = 0x00; | |
100 | lapb->n2count = 0; | |
101 | lapb->vs = 0; | |
102 | lapb->vr = 0; | |
103 | lapb->va = 0; | |
104 | lapb_connect_indication(lapb, LAPB_OK); | |
105 | } else { | |
106 | #if LAPB_DEBUG > 1 | |
107 | printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", | |
108 | lapb->dev, frame->pf); | |
1da177e4 | 109 | #endif |
fcb261f3 JP |
110 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
111 | LAPB_RESPONSE); | |
112 | } | |
113 | break; | |
1da177e4 | 114 | |
fcb261f3 | 115 | case LAPB_DISC: |
1da177e4 | 116 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
117 | printk(KERN_DEBUG "lapb: (%p) S0 RX DISC(%d)\n", |
118 | lapb->dev, frame->pf); | |
119 | printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", | |
120 | lapb->dev, frame->pf); | |
1da177e4 | 121 | #endif |
fcb261f3 JP |
122 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
123 | break; | |
1da177e4 | 124 | |
fcb261f3 JP |
125 | default: |
126 | break; | |
1da177e4 LT |
127 | } |
128 | ||
129 | kfree_skb(skb); | |
130 | } | |
131 | ||
132 | /* | |
133 | * State machine for state 1, Awaiting Connection State. | |
134 | * The handling of the timer(s) is in file lapb_timer.c. | |
135 | */ | |
136 | static void lapb_state1_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
137 | struct lapb_frame *frame) | |
138 | { | |
139 | switch (frame->type) { | |
fcb261f3 | 140 | case LAPB_SABM: |
1da177e4 | 141 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
142 | printk(KERN_DEBUG "lapb: (%p) S1 RX SABM(%d)\n", |
143 | lapb->dev, frame->pf); | |
1da177e4 | 144 | #endif |
fcb261f3 | 145 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 146 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
147 | printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", |
148 | lapb->dev, frame->pf); | |
1da177e4 | 149 | #endif |
fcb261f3 JP |
150 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
151 | LAPB_RESPONSE); | |
152 | } else { | |
1da177e4 | 153 | #if LAPB_DEBUG > 1 |
fcb261f3 | 154 | printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", |
1da177e4 LT |
155 | lapb->dev, frame->pf); |
156 | #endif | |
fcb261f3 JP |
157 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
158 | LAPB_RESPONSE); | |
159 | } | |
160 | break; | |
161 | ||
162 | case LAPB_SABME: | |
1da177e4 | 163 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
164 | printk(KERN_DEBUG "lapb: (%p) S1 RX SABME(%d)\n", |
165 | lapb->dev, frame->pf); | |
1da177e4 | 166 | #endif |
fcb261f3 | 167 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 168 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
169 | printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", |
170 | lapb->dev, frame->pf); | |
1da177e4 | 171 | #endif |
fcb261f3 JP |
172 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
173 | LAPB_RESPONSE); | |
174 | } else { | |
1da177e4 | 175 | #if LAPB_DEBUG > 1 |
1da177e4 LT |
176 | printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", |
177 | lapb->dev, frame->pf); | |
178 | #endif | |
179 | lapb_send_control(lapb, LAPB_DM, frame->pf, | |
180 | LAPB_RESPONSE); | |
fcb261f3 JP |
181 | } |
182 | break; | |
1da177e4 | 183 | |
fcb261f3 | 184 | case LAPB_DISC: |
1da177e4 | 185 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
186 | printk(KERN_DEBUG "lapb: (%p) S1 RX DISC(%d)\n", |
187 | lapb->dev, frame->pf); | |
188 | printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", | |
189 | lapb->dev, frame->pf); | |
1da177e4 | 190 | #endif |
fcb261f3 JP |
191 | lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
192 | break; | |
1da177e4 | 193 | |
fcb261f3 | 194 | case LAPB_UA: |
1da177e4 | 195 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
196 | printk(KERN_DEBUG "lapb: (%p) S1 RX UA(%d)\n", |
197 | lapb->dev, frame->pf); | |
1da177e4 | 198 | #endif |
fcb261f3 | 199 | if (frame->pf) { |
1da177e4 | 200 | #if LAPB_DEBUG > 0 |
fcb261f3 JP |
201 | printk(KERN_DEBUG "lapb: (%p) S1 -> S3\n", lapb->dev); |
202 | #endif | |
203 | lapb_stop_t1timer(lapb); | |
204 | lapb_stop_t2timer(lapb); | |
205 | lapb->state = LAPB_STATE_3; | |
206 | lapb->condition = 0x00; | |
207 | lapb->n2count = 0; | |
208 | lapb->vs = 0; | |
209 | lapb->vr = 0; | |
210 | lapb->va = 0; | |
211 | lapb_connect_confirmation(lapb, LAPB_OK); | |
212 | } | |
213 | break; | |
214 | ||
215 | case LAPB_DM: | |
216 | #if LAPB_DEBUG > 1 | |
217 | printk(KERN_DEBUG "lapb: (%p) S1 RX DM(%d)\n", | |
218 | lapb->dev, frame->pf); | |
219 | #endif | |
220 | if (frame->pf) { | |
221 | #if LAPB_DEBUG > 0 | |
222 | printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev); | |
223 | #endif | |
224 | lapb_clear_queues(lapb); | |
225 | lapb->state = LAPB_STATE_0; | |
226 | lapb_start_t1timer(lapb); | |
227 | lapb_stop_t2timer(lapb); | |
228 | lapb_disconnect_indication(lapb, LAPB_REFUSED); | |
229 | } | |
230 | break; | |
1da177e4 LT |
231 | } |
232 | ||
233 | kfree_skb(skb); | |
234 | } | |
235 | ||
236 | /* | |
237 | * State machine for state 2, Awaiting Release State. | |
238 | * The handling of the timer(s) is in file lapb_timer.c | |
239 | */ | |
240 | static void lapb_state2_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
241 | struct lapb_frame *frame) | |
242 | { | |
243 | switch (frame->type) { | |
fcb261f3 JP |
244 | case LAPB_SABM: |
245 | case LAPB_SABME: | |
1da177e4 | 246 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
247 | printk(KERN_DEBUG "lapb: (%p) S2 RX {SABM,SABME}(%d)\n", |
248 | lapb->dev, frame->pf); | |
249 | printk(KERN_DEBUG "lapb: (%p) S2 TX DM(%d)\n", | |
250 | lapb->dev, frame->pf); | |
1da177e4 | 251 | #endif |
fcb261f3 JP |
252 | lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
253 | break; | |
1da177e4 | 254 | |
fcb261f3 | 255 | case LAPB_DISC: |
1da177e4 | 256 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
257 | printk(KERN_DEBUG "lapb: (%p) S2 RX DISC(%d)\n", |
258 | lapb->dev, frame->pf); | |
259 | printk(KERN_DEBUG "lapb: (%p) S2 TX UA(%d)\n", | |
260 | lapb->dev, frame->pf); | |
1da177e4 | 261 | #endif |
fcb261f3 JP |
262 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
263 | break; | |
1da177e4 | 264 | |
fcb261f3 | 265 | case LAPB_UA: |
1da177e4 | 266 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
267 | printk(KERN_DEBUG "lapb: (%p) S2 RX UA(%d)\n", |
268 | lapb->dev, frame->pf); | |
1da177e4 | 269 | #endif |
fcb261f3 | 270 | if (frame->pf) { |
1da177e4 | 271 | #if LAPB_DEBUG > 0 |
fcb261f3 | 272 | printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev); |
1da177e4 | 273 | #endif |
fcb261f3 JP |
274 | lapb->state = LAPB_STATE_0; |
275 | lapb_start_t1timer(lapb); | |
276 | lapb_stop_t2timer(lapb); | |
277 | lapb_disconnect_confirmation(lapb, LAPB_OK); | |
278 | } | |
279 | break; | |
1da177e4 | 280 | |
fcb261f3 | 281 | case LAPB_DM: |
1da177e4 | 282 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
283 | printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", |
284 | lapb->dev, frame->pf); | |
1da177e4 | 285 | #endif |
fcb261f3 | 286 | if (frame->pf) { |
1da177e4 | 287 | #if LAPB_DEBUG > 0 |
fcb261f3 JP |
288 | printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev); |
289 | #endif | |
290 | lapb->state = LAPB_STATE_0; | |
291 | lapb_start_t1timer(lapb); | |
292 | lapb_stop_t2timer(lapb); | |
293 | lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED); | |
294 | } | |
295 | break; | |
1da177e4 | 296 | |
fcb261f3 JP |
297 | case LAPB_I: |
298 | case LAPB_REJ: | |
299 | case LAPB_RNR: | |
300 | case LAPB_RR: | |
1da177e4 | 301 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
302 | printk(KERN_DEBUG "lapb: (%p) S2 RX {I,REJ,RNR,RR}(%d)\n", |
303 | lapb->dev, frame->pf); | |
304 | printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", | |
305 | lapb->dev, frame->pf); | |
1da177e4 | 306 | #endif |
fcb261f3 JP |
307 | if (frame->pf) |
308 | lapb_send_control(lapb, LAPB_DM, frame->pf, | |
309 | LAPB_RESPONSE); | |
310 | break; | |
1da177e4 LT |
311 | } |
312 | ||
313 | kfree_skb(skb); | |
314 | } | |
315 | ||
316 | /* | |
317 | * State machine for state 3, Connected State. | |
318 | * The handling of the timer(s) is in file lapb_timer.c | |
319 | */ | |
320 | static void lapb_state3_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
321 | struct lapb_frame *frame) | |
322 | { | |
323 | int queued = 0; | |
324 | int modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : | |
325 | LAPB_SMODULUS; | |
326 | ||
327 | switch (frame->type) { | |
fcb261f3 | 328 | case LAPB_SABM: |
1da177e4 | 329 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
330 | printk(KERN_DEBUG "lapb: (%p) S3 RX SABM(%d)\n", |
331 | lapb->dev, frame->pf); | |
1da177e4 | 332 | #endif |
fcb261f3 | 333 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 334 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
335 | printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", |
336 | lapb->dev, frame->pf); | |
1da177e4 | 337 | #endif |
fcb261f3 JP |
338 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
339 | LAPB_RESPONSE); | |
340 | } else { | |
1da177e4 | 341 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
342 | printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", |
343 | lapb->dev, frame->pf); | |
1da177e4 | 344 | #endif |
fcb261f3 JP |
345 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
346 | LAPB_RESPONSE); | |
347 | lapb_stop_t1timer(lapb); | |
348 | lapb_stop_t2timer(lapb); | |
349 | lapb->condition = 0x00; | |
350 | lapb->n2count = 0; | |
351 | lapb->vs = 0; | |
352 | lapb->vr = 0; | |
353 | lapb->va = 0; | |
354 | lapb_requeue_frames(lapb); | |
355 | } | |
356 | break; | |
1da177e4 | 357 | |
fcb261f3 | 358 | case LAPB_SABME: |
1da177e4 | 359 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
360 | printk(KERN_DEBUG "lapb: (%p) S3 RX SABME(%d)\n", |
361 | lapb->dev, frame->pf); | |
1da177e4 | 362 | #endif |
fcb261f3 | 363 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 364 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
365 | printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", |
366 | lapb->dev, frame->pf); | |
1da177e4 | 367 | #endif |
fcb261f3 JP |
368 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
369 | LAPB_RESPONSE); | |
370 | lapb_stop_t1timer(lapb); | |
371 | lapb_stop_t2timer(lapb); | |
372 | lapb->condition = 0x00; | |
373 | lapb->n2count = 0; | |
374 | lapb->vs = 0; | |
375 | lapb->vr = 0; | |
376 | lapb->va = 0; | |
377 | lapb_requeue_frames(lapb); | |
378 | } else { | |
1da177e4 | 379 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
380 | printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", |
381 | lapb->dev, frame->pf); | |
1da177e4 | 382 | #endif |
fcb261f3 JP |
383 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
384 | LAPB_RESPONSE); | |
385 | } | |
386 | break; | |
1da177e4 | 387 | |
fcb261f3 | 388 | case LAPB_DISC: |
1da177e4 | 389 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
390 | printk(KERN_DEBUG "lapb: (%p) S3 RX DISC(%d)\n", |
391 | lapb->dev, frame->pf); | |
1da177e4 LT |
392 | #endif |
393 | #if LAPB_DEBUG > 0 | |
fcb261f3 | 394 | printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev); |
1da177e4 | 395 | #endif |
fcb261f3 JP |
396 | lapb_clear_queues(lapb); |
397 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); | |
398 | lapb_start_t1timer(lapb); | |
399 | lapb_stop_t2timer(lapb); | |
400 | lapb->state = LAPB_STATE_0; | |
401 | lapb_disconnect_indication(lapb, LAPB_OK); | |
402 | break; | |
1da177e4 | 403 | |
fcb261f3 | 404 | case LAPB_DM: |
1da177e4 | 405 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
406 | printk(KERN_DEBUG "lapb: (%p) S3 RX DM(%d)\n", |
407 | lapb->dev, frame->pf); | |
1da177e4 LT |
408 | #endif |
409 | #if LAPB_DEBUG > 0 | |
fcb261f3 | 410 | printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev); |
1da177e4 | 411 | #endif |
fcb261f3 JP |
412 | lapb_clear_queues(lapb); |
413 | lapb->state = LAPB_STATE_0; | |
414 | lapb_start_t1timer(lapb); | |
415 | lapb_stop_t2timer(lapb); | |
416 | lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED); | |
417 | break; | |
1da177e4 | 418 | |
fcb261f3 | 419 | case LAPB_RNR: |
1da177e4 | 420 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
421 | printk(KERN_DEBUG "lapb: (%p) S3 RX RNR(%d) R%d\n", |
422 | lapb->dev, frame->pf, frame->nr); | |
1da177e4 | 423 | #endif |
fcb261f3 JP |
424 | lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION; |
425 | lapb_check_need_response(lapb, frame->cr, frame->pf); | |
426 | if (lapb_validate_nr(lapb, frame->nr)) { | |
427 | lapb_check_iframes_acked(lapb, frame->nr); | |
428 | } else { | |
429 | lapb->frmr_data = *frame; | |
430 | lapb->frmr_type = LAPB_FRMR_Z; | |
431 | lapb_transmit_frmr(lapb); | |
1da177e4 | 432 | #if LAPB_DEBUG > 0 |
fcb261f3 | 433 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->dev); |
1da177e4 | 434 | #endif |
fcb261f3 JP |
435 | lapb_start_t1timer(lapb); |
436 | lapb_stop_t2timer(lapb); | |
437 | lapb->state = LAPB_STATE_4; | |
438 | lapb->n2count = 0; | |
439 | } | |
440 | break; | |
1da177e4 | 441 | |
fcb261f3 | 442 | case LAPB_RR: |
1da177e4 | 443 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
444 | printk(KERN_DEBUG "lapb: (%p) S3 RX RR(%d) R%d\n", |
445 | lapb->dev, frame->pf, frame->nr); | |
1da177e4 | 446 | #endif |
fcb261f3 JP |
447 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
448 | lapb_check_need_response(lapb, frame->cr, frame->pf); | |
449 | if (lapb_validate_nr(lapb, frame->nr)) { | |
450 | lapb_check_iframes_acked(lapb, frame->nr); | |
451 | } else { | |
452 | lapb->frmr_data = *frame; | |
453 | lapb->frmr_type = LAPB_FRMR_Z; | |
454 | lapb_transmit_frmr(lapb); | |
1da177e4 | 455 | #if LAPB_DEBUG > 0 |
fcb261f3 | 456 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->dev); |
1da177e4 | 457 | #endif |
fcb261f3 JP |
458 | lapb_start_t1timer(lapb); |
459 | lapb_stop_t2timer(lapb); | |
460 | lapb->state = LAPB_STATE_4; | |
461 | lapb->n2count = 0; | |
462 | } | |
463 | break; | |
1da177e4 | 464 | |
fcb261f3 | 465 | case LAPB_REJ: |
1da177e4 | 466 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
467 | printk(KERN_DEBUG "lapb: (%p) S3 RX REJ(%d) R%d\n", |
468 | lapb->dev, frame->pf, frame->nr); | |
1da177e4 | 469 | #endif |
fcb261f3 JP |
470 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
471 | lapb_check_need_response(lapb, frame->cr, frame->pf); | |
472 | if (lapb_validate_nr(lapb, frame->nr)) { | |
473 | lapb_frames_acked(lapb, frame->nr); | |
474 | lapb_stop_t1timer(lapb); | |
475 | lapb->n2count = 0; | |
476 | lapb_requeue_frames(lapb); | |
477 | } else { | |
478 | lapb->frmr_data = *frame; | |
479 | lapb->frmr_type = LAPB_FRMR_Z; | |
480 | lapb_transmit_frmr(lapb); | |
1da177e4 | 481 | #if LAPB_DEBUG > 0 |
fcb261f3 | 482 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->dev); |
1da177e4 | 483 | #endif |
fcb261f3 JP |
484 | lapb_start_t1timer(lapb); |
485 | lapb_stop_t2timer(lapb); | |
486 | lapb->state = LAPB_STATE_4; | |
487 | lapb->n2count = 0; | |
488 | } | |
489 | break; | |
1da177e4 | 490 | |
fcb261f3 | 491 | case LAPB_I: |
1da177e4 | 492 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
493 | printk(KERN_DEBUG "lapb: (%p) S3 RX I(%d) S%d R%d\n", |
494 | lapb->dev, frame->pf, frame->ns, frame->nr); | |
1da177e4 | 495 | #endif |
fcb261f3 JP |
496 | if (!lapb_validate_nr(lapb, frame->nr)) { |
497 | lapb->frmr_data = *frame; | |
498 | lapb->frmr_type = LAPB_FRMR_Z; | |
499 | lapb_transmit_frmr(lapb); | |
1da177e4 | 500 | #if LAPB_DEBUG > 0 |
fcb261f3 | 501 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->dev); |
1da177e4 | 502 | #endif |
fcb261f3 JP |
503 | lapb_start_t1timer(lapb); |
504 | lapb_stop_t2timer(lapb); | |
505 | lapb->state = LAPB_STATE_4; | |
506 | lapb->n2count = 0; | |
507 | break; | |
508 | } | |
509 | if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) | |
510 | lapb_frames_acked(lapb, frame->nr); | |
511 | else | |
512 | lapb_check_iframes_acked(lapb, frame->nr); | |
513 | ||
514 | if (frame->ns == lapb->vr) { | |
515 | int cn; | |
516 | cn = lapb_data_indication(lapb, skb); | |
517 | queued = 1; | |
518 | /* | |
519 | * If upper layer has dropped the frame, we | |
520 | * basically ignore any further protocol | |
521 | * processing. This will cause the peer | |
522 | * to re-transmit the frame later like | |
523 | * a frame lost on the wire. | |
524 | */ | |
525 | if (cn == NET_RX_DROP) { | |
526 | printk(KERN_DEBUG "LAPB: rx congestion\n"); | |
1da177e4 LT |
527 | break; |
528 | } | |
fcb261f3 JP |
529 | lapb->vr = (lapb->vr + 1) % modulus; |
530 | lapb->condition &= ~LAPB_REJECT_CONDITION; | |
531 | if (frame->pf) | |
532 | lapb_enquiry_response(lapb); | |
533 | else { | |
534 | if (!(lapb->condition & | |
535 | LAPB_ACK_PENDING_CONDITION)) { | |
536 | lapb->condition |= LAPB_ACK_PENDING_CONDITION; | |
537 | lapb_start_t2timer(lapb); | |
1da177e4 | 538 | } |
fcb261f3 JP |
539 | } |
540 | } else { | |
541 | if (lapb->condition & LAPB_REJECT_CONDITION) { | |
1da177e4 LT |
542 | if (frame->pf) |
543 | lapb_enquiry_response(lapb); | |
1da177e4 | 544 | } else { |
fcb261f3 JP |
545 | #if LAPB_DEBUG > 1 |
546 | printk(KERN_DEBUG | |
547 | "lapb: (%p) S3 TX REJ(%d) R%d\n", | |
548 | lapb->dev, frame->pf, lapb->vr); | |
549 | #endif | |
550 | lapb->condition |= LAPB_REJECT_CONDITION; | |
551 | lapb_send_control(lapb, LAPB_REJ, frame->pf, | |
552 | LAPB_RESPONSE); | |
553 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; | |
1da177e4 | 554 | } |
fcb261f3 JP |
555 | } |
556 | break; | |
1da177e4 | 557 | |
fcb261f3 | 558 | case LAPB_FRMR: |
1da177e4 | 559 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
560 | printk(KERN_DEBUG "lapb: (%p) S3 RX FRMR(%d) %02X " |
561 | "%02X %02X %02X %02X\n", lapb->dev, frame->pf, | |
562 | skb->data[0], skb->data[1], skb->data[2], | |
563 | skb->data[3], skb->data[4]); | |
1da177e4 | 564 | #endif |
fcb261f3 | 565 | lapb_establish_data_link(lapb); |
1da177e4 | 566 | #if LAPB_DEBUG > 0 |
fcb261f3 | 567 | printk(KERN_DEBUG "lapb: (%p) S3 -> S1\n", lapb->dev); |
1da177e4 | 568 | #endif |
fcb261f3 JP |
569 | lapb_requeue_frames(lapb); |
570 | lapb->state = LAPB_STATE_1; | |
571 | break; | |
1da177e4 | 572 | |
fcb261f3 | 573 | case LAPB_ILLEGAL: |
1da177e4 | 574 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
575 | printk(KERN_DEBUG "lapb: (%p) S3 RX ILLEGAL(%d)\n", |
576 | lapb->dev, frame->pf); | |
1da177e4 | 577 | #endif |
fcb261f3 JP |
578 | lapb->frmr_data = *frame; |
579 | lapb->frmr_type = LAPB_FRMR_W; | |
580 | lapb_transmit_frmr(lapb); | |
1da177e4 | 581 | #if LAPB_DEBUG > 0 |
fcb261f3 | 582 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->dev); |
1da177e4 | 583 | #endif |
fcb261f3 JP |
584 | lapb_start_t1timer(lapb); |
585 | lapb_stop_t2timer(lapb); | |
586 | lapb->state = LAPB_STATE_4; | |
587 | lapb->n2count = 0; | |
588 | break; | |
1da177e4 LT |
589 | } |
590 | ||
591 | if (!queued) | |
592 | kfree_skb(skb); | |
593 | } | |
594 | ||
595 | /* | |
596 | * State machine for state 4, Frame Reject State. | |
597 | * The handling of the timer(s) is in file lapb_timer.c. | |
598 | */ | |
599 | static void lapb_state4_machine(struct lapb_cb *lapb, struct sk_buff *skb, | |
600 | struct lapb_frame *frame) | |
601 | { | |
602 | switch (frame->type) { | |
fcb261f3 | 603 | case LAPB_SABM: |
1da177e4 | 604 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
605 | printk(KERN_DEBUG "lapb: (%p) S4 RX SABM(%d)\n", |
606 | lapb->dev, frame->pf); | |
1da177e4 | 607 | #endif |
fcb261f3 | 608 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 609 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
610 | printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", |
611 | lapb->dev, frame->pf); | |
1da177e4 | 612 | #endif |
fcb261f3 JP |
613 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
614 | LAPB_RESPONSE); | |
615 | } else { | |
1da177e4 | 616 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
617 | printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", |
618 | lapb->dev, frame->pf); | |
1da177e4 LT |
619 | #endif |
620 | #if LAPB_DEBUG > 0 | |
fcb261f3 | 621 | printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", lapb->dev); |
1da177e4 | 622 | #endif |
fcb261f3 JP |
623 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
624 | LAPB_RESPONSE); | |
625 | lapb_stop_t1timer(lapb); | |
626 | lapb_stop_t2timer(lapb); | |
627 | lapb->state = LAPB_STATE_3; | |
628 | lapb->condition = 0x00; | |
629 | lapb->n2count = 0; | |
630 | lapb->vs = 0; | |
631 | lapb->vr = 0; | |
632 | lapb->va = 0; | |
633 | lapb_connect_indication(lapb, LAPB_OK); | |
634 | } | |
635 | break; | |
1da177e4 | 636 | |
fcb261f3 | 637 | case LAPB_SABME: |
1da177e4 | 638 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
639 | printk(KERN_DEBUG "lapb: (%p) S4 RX SABME(%d)\n", |
640 | lapb->dev, frame->pf); | |
1da177e4 | 641 | #endif |
fcb261f3 | 642 | if (lapb->mode & LAPB_EXTENDED) { |
1da177e4 | 643 | #if LAPB_DEBUG > 1 |
fcb261f3 JP |
644 | printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", |
645 | lapb->dev, frame->pf); | |
1da177e4 LT |
646 | #endif |
647 | #if LAPB_DEBUG > 0 | |
fcb261f3 | 648 | printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", lapb->dev); |
1da177e4 | 649 | #endif |
fcb261f3 JP |
650 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
651 | LAPB_RESPONSE); | |
652 | lapb_stop_t1timer(lapb); | |
653 | lapb_stop_t2timer(lapb); | |
654 | lapb->state = LAPB_STATE_3; | |
655 | lapb->condition = 0x00; | |
656 | lapb->n2count = 0; | |
657 | lapb->vs = 0; | |
658 | lapb->vr = 0; | |
659 | lapb->va = 0; | |
660 | lapb_connect_indication(lapb, LAPB_OK); | |
661 | } else { | |
662 | #if LAPB_DEBUG > 1 | |
663 | printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", | |
664 | lapb->dev, frame->pf); | |
1da177e4 | 665 | #endif |
fcb261f3 JP |
666 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
667 | LAPB_RESPONSE); | |
668 | } | |
669 | break; | |
1da177e4 LT |
670 | } |
671 | ||
672 | kfree_skb(skb); | |
673 | } | |
674 | ||
675 | /* | |
676 | * Process an incoming LAPB frame | |
677 | */ | |
678 | void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *skb) | |
679 | { | |
680 | struct lapb_frame frame; | |
681 | ||
682 | if (lapb_decode(lapb, skb, &frame) < 0) { | |
683 | kfree_skb(skb); | |
684 | return; | |
685 | } | |
686 | ||
687 | switch (lapb->state) { | |
688 | case LAPB_STATE_0: | |
689 | lapb_state0_machine(lapb, skb, &frame); break; | |
690 | case LAPB_STATE_1: | |
691 | lapb_state1_machine(lapb, skb, &frame); break; | |
692 | case LAPB_STATE_2: | |
693 | lapb_state2_machine(lapb, skb, &frame); break; | |
694 | case LAPB_STATE_3: | |
695 | lapb_state3_machine(lapb, skb, &frame); break; | |
696 | case LAPB_STATE_4: | |
697 | lapb_state4_machine(lapb, skb, &frame); break; | |
698 | } | |
699 | ||
700 | lapb_kick(lapb); | |
701 | } |