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