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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 Naylor Started Coding | |
14 | * LAPB 002 Jonathan Naylor New timer architecture. | |
15 | * 2000-10-29 Henner Eisen lapb_data_indication() return status. | |
16 | */ | |
56d6c3d7 | 17 | |
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/errno.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/skbuff.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
33 | #include <net/sock.h> |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/system.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/stat.h> | |
40 | #include <linux/init.h> | |
41 | #include <net/lapb.h> | |
42 | ||
14d0e7b7 | 43 | static LIST_HEAD(lapb_list); |
1da177e4 LT |
44 | static DEFINE_RWLOCK(lapb_list_lock); |
45 | ||
46 | /* | |
56d6c3d7 | 47 | * Free an allocated lapb control block. |
1da177e4 LT |
48 | */ |
49 | static void lapb_free_cb(struct lapb_cb *lapb) | |
50 | { | |
51 | kfree(lapb); | |
52 | } | |
53 | ||
54 | static __inline__ void lapb_hold(struct lapb_cb *lapb) | |
55 | { | |
56 | atomic_inc(&lapb->refcnt); | |
57 | } | |
58 | ||
59 | static __inline__ void lapb_put(struct lapb_cb *lapb) | |
60 | { | |
61 | if (atomic_dec_and_test(&lapb->refcnt)) | |
62 | lapb_free_cb(lapb); | |
63 | } | |
64 | ||
65 | /* | |
66 | * Socket removal during an interrupt is now safe. | |
67 | */ | |
68 | static void __lapb_remove_cb(struct lapb_cb *lapb) | |
69 | { | |
70 | if (lapb->node.next) { | |
71 | list_del(&lapb->node); | |
72 | lapb_put(lapb); | |
73 | } | |
74 | } | |
75 | ||
76 | /* | |
77 | * Add a socket to the bound sockets list. | |
78 | */ | |
79 | static void __lapb_insert_cb(struct lapb_cb *lapb) | |
80 | { | |
81 | list_add(&lapb->node, &lapb_list); | |
82 | lapb_hold(lapb); | |
83 | } | |
84 | ||
85 | static struct lapb_cb *__lapb_devtostruct(struct net_device *dev) | |
86 | { | |
87 | struct list_head *entry; | |
88 | struct lapb_cb *lapb, *use = NULL; | |
89 | ||
90 | list_for_each(entry, &lapb_list) { | |
91 | lapb = list_entry(entry, struct lapb_cb, node); | |
92 | if (lapb->dev == dev) { | |
93 | use = lapb; | |
94 | break; | |
95 | } | |
96 | } | |
97 | ||
98 | if (use) | |
99 | lapb_hold(use); | |
100 | ||
101 | return use; | |
102 | } | |
103 | ||
104 | static struct lapb_cb *lapb_devtostruct(struct net_device *dev) | |
105 | { | |
106 | struct lapb_cb *rc; | |
107 | ||
108 | read_lock_bh(&lapb_list_lock); | |
109 | rc = __lapb_devtostruct(dev); | |
110 | read_unlock_bh(&lapb_list_lock); | |
111 | ||
112 | return rc; | |
113 | } | |
114 | /* | |
115 | * Create an empty LAPB control block. | |
116 | */ | |
117 | static struct lapb_cb *lapb_create_cb(void) | |
118 | { | |
0da974f4 | 119 | struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC); |
1da177e4 LT |
120 | |
121 | ||
122 | if (!lapb) | |
123 | goto out; | |
124 | ||
1da177e4 LT |
125 | skb_queue_head_init(&lapb->write_queue); |
126 | skb_queue_head_init(&lapb->ack_queue); | |
127 | ||
128 | init_timer(&lapb->t1timer); | |
129 | init_timer(&lapb->t2timer); | |
130 | ||
131 | lapb->t1 = LAPB_DEFAULT_T1; | |
132 | lapb->t2 = LAPB_DEFAULT_T2; | |
133 | lapb->n2 = LAPB_DEFAULT_N2; | |
134 | lapb->mode = LAPB_DEFAULT_MODE; | |
135 | lapb->window = LAPB_DEFAULT_WINDOW; | |
136 | lapb->state = LAPB_STATE_0; | |
137 | atomic_set(&lapb->refcnt, 1); | |
138 | out: | |
139 | return lapb; | |
140 | } | |
141 | ||
142 | int lapb_register(struct net_device *dev, struct lapb_register_struct *callbacks) | |
143 | { | |
144 | struct lapb_cb *lapb; | |
145 | int rc = LAPB_BADTOKEN; | |
146 | ||
147 | write_lock_bh(&lapb_list_lock); | |
148 | ||
149 | lapb = __lapb_devtostruct(dev); | |
150 | if (lapb) { | |
151 | lapb_put(lapb); | |
152 | goto out; | |
153 | } | |
154 | ||
155 | lapb = lapb_create_cb(); | |
156 | rc = LAPB_NOMEM; | |
157 | if (!lapb) | |
158 | goto out; | |
159 | ||
160 | lapb->dev = dev; | |
161 | lapb->callbacks = *callbacks; | |
162 | ||
163 | __lapb_insert_cb(lapb); | |
164 | ||
165 | lapb_start_t1timer(lapb); | |
166 | ||
167 | rc = LAPB_OK; | |
168 | out: | |
169 | write_unlock_bh(&lapb_list_lock); | |
170 | return rc; | |
171 | } | |
172 | ||
173 | int lapb_unregister(struct net_device *dev) | |
174 | { | |
175 | struct lapb_cb *lapb; | |
176 | int rc = LAPB_BADTOKEN; | |
177 | ||
178 | write_lock_bh(&lapb_list_lock); | |
179 | lapb = __lapb_devtostruct(dev); | |
180 | if (!lapb) | |
181 | goto out; | |
182 | ||
183 | lapb_stop_t1timer(lapb); | |
184 | lapb_stop_t2timer(lapb); | |
185 | ||
186 | lapb_clear_queues(lapb); | |
187 | ||
188 | __lapb_remove_cb(lapb); | |
189 | ||
190 | lapb_put(lapb); | |
191 | rc = LAPB_OK; | |
192 | out: | |
193 | write_unlock_bh(&lapb_list_lock); | |
194 | return rc; | |
195 | } | |
196 | ||
197 | int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms) | |
198 | { | |
199 | int rc = LAPB_BADTOKEN; | |
200 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
201 | ||
202 | if (!lapb) | |
203 | goto out; | |
204 | ||
205 | parms->t1 = lapb->t1 / HZ; | |
206 | parms->t2 = lapb->t2 / HZ; | |
207 | parms->n2 = lapb->n2; | |
208 | parms->n2count = lapb->n2count; | |
209 | parms->state = lapb->state; | |
210 | parms->window = lapb->window; | |
211 | parms->mode = lapb->mode; | |
212 | ||
213 | if (!timer_pending(&lapb->t1timer)) | |
214 | parms->t1timer = 0; | |
215 | else | |
216 | parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ; | |
217 | ||
218 | if (!timer_pending(&lapb->t2timer)) | |
219 | parms->t2timer = 0; | |
220 | else | |
221 | parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ; | |
222 | ||
223 | lapb_put(lapb); | |
224 | rc = LAPB_OK; | |
225 | out: | |
226 | return rc; | |
227 | } | |
228 | ||
229 | int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms) | |
230 | { | |
231 | int rc = LAPB_BADTOKEN; | |
232 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
233 | ||
234 | if (!lapb) | |
235 | goto out; | |
236 | ||
237 | rc = LAPB_INVALUE; | |
238 | if (parms->t1 < 1 || parms->t2 < 1 || parms->n2 < 1) | |
239 | goto out_put; | |
240 | ||
241 | if (lapb->state == LAPB_STATE_0) { | |
558e10a5 DC |
242 | if (parms->mode & LAPB_EXTENDED) { |
243 | if (parms->window < 1 || parms->window > 127) | |
244 | goto out_put; | |
245 | } else { | |
246 | if (parms->window < 1 || parms->window > 7) | |
247 | goto out_put; | |
248 | } | |
1da177e4 LT |
249 | lapb->mode = parms->mode; |
250 | lapb->window = parms->window; | |
251 | } | |
252 | ||
253 | lapb->t1 = parms->t1 * HZ; | |
254 | lapb->t2 = parms->t2 * HZ; | |
255 | lapb->n2 = parms->n2; | |
256 | ||
257 | rc = LAPB_OK; | |
258 | out_put: | |
259 | lapb_put(lapb); | |
260 | out: | |
261 | return rc; | |
262 | } | |
263 | ||
264 | int lapb_connect_request(struct net_device *dev) | |
265 | { | |
266 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
267 | int rc = LAPB_BADTOKEN; | |
268 | ||
269 | if (!lapb) | |
270 | goto out; | |
271 | ||
272 | rc = LAPB_OK; | |
273 | if (lapb->state == LAPB_STATE_1) | |
274 | goto out_put; | |
275 | ||
276 | rc = LAPB_CONNECTED; | |
277 | if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4) | |
278 | goto out_put; | |
279 | ||
280 | lapb_establish_data_link(lapb); | |
281 | ||
282 | #if LAPB_DEBUG > 0 | |
283 | printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->dev); | |
284 | #endif | |
285 | lapb->state = LAPB_STATE_1; | |
286 | ||
287 | rc = LAPB_OK; | |
288 | out_put: | |
289 | lapb_put(lapb); | |
290 | out: | |
291 | return rc; | |
292 | } | |
293 | ||
294 | int lapb_disconnect_request(struct net_device *dev) | |
295 | { | |
296 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
297 | int rc = LAPB_BADTOKEN; | |
298 | ||
299 | if (!lapb) | |
300 | goto out; | |
301 | ||
302 | switch (lapb->state) { | |
303 | case LAPB_STATE_0: | |
304 | rc = LAPB_NOTCONNECTED; | |
305 | goto out_put; | |
306 | ||
307 | case LAPB_STATE_1: | |
308 | #if LAPB_DEBUG > 1 | |
309 | printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->dev); | |
310 | #endif | |
311 | #if LAPB_DEBUG > 0 | |
312 | printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev); | |
313 | #endif | |
314 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); | |
315 | lapb->state = LAPB_STATE_0; | |
316 | lapb_start_t1timer(lapb); | |
317 | rc = LAPB_NOTCONNECTED; | |
318 | goto out_put; | |
319 | ||
320 | case LAPB_STATE_2: | |
321 | rc = LAPB_OK; | |
322 | goto out_put; | |
323 | } | |
324 | ||
325 | lapb_clear_queues(lapb); | |
326 | lapb->n2count = 0; | |
327 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); | |
328 | lapb_start_t1timer(lapb); | |
329 | lapb_stop_t2timer(lapb); | |
330 | lapb->state = LAPB_STATE_2; | |
331 | ||
332 | #if LAPB_DEBUG > 1 | |
333 | printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->dev); | |
334 | #endif | |
335 | #if LAPB_DEBUG > 0 | |
336 | printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->dev); | |
337 | #endif | |
338 | ||
339 | rc = LAPB_OK; | |
340 | out_put: | |
341 | lapb_put(lapb); | |
342 | out: | |
343 | return rc; | |
344 | } | |
345 | ||
346 | int lapb_data_request(struct net_device *dev, struct sk_buff *skb) | |
347 | { | |
348 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
349 | int rc = LAPB_BADTOKEN; | |
350 | ||
351 | if (!lapb) | |
352 | goto out; | |
353 | ||
354 | rc = LAPB_NOTCONNECTED; | |
355 | if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4) | |
356 | goto out_put; | |
357 | ||
358 | skb_queue_tail(&lapb->write_queue, skb); | |
359 | lapb_kick(lapb); | |
360 | rc = LAPB_OK; | |
361 | out_put: | |
362 | lapb_put(lapb); | |
363 | out: | |
364 | return rc; | |
365 | } | |
366 | ||
367 | int lapb_data_received(struct net_device *dev, struct sk_buff *skb) | |
368 | { | |
369 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
370 | int rc = LAPB_BADTOKEN; | |
371 | ||
372 | if (lapb) { | |
373 | lapb_data_input(lapb, skb); | |
374 | lapb_put(lapb); | |
375 | rc = LAPB_OK; | |
376 | } | |
377 | ||
378 | return rc; | |
379 | } | |
380 | ||
381 | void lapb_connect_confirmation(struct lapb_cb *lapb, int reason) | |
382 | { | |
383 | if (lapb->callbacks.connect_confirmation) | |
384 | lapb->callbacks.connect_confirmation(lapb->dev, reason); | |
385 | } | |
386 | ||
387 | void lapb_connect_indication(struct lapb_cb *lapb, int reason) | |
388 | { | |
389 | if (lapb->callbacks.connect_indication) | |
390 | lapb->callbacks.connect_indication(lapb->dev, reason); | |
391 | } | |
392 | ||
393 | void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason) | |
394 | { | |
395 | if (lapb->callbacks.disconnect_confirmation) | |
396 | lapb->callbacks.disconnect_confirmation(lapb->dev, reason); | |
397 | } | |
398 | ||
399 | void lapb_disconnect_indication(struct lapb_cb *lapb, int reason) | |
400 | { | |
401 | if (lapb->callbacks.disconnect_indication) | |
402 | lapb->callbacks.disconnect_indication(lapb->dev, reason); | |
403 | } | |
404 | ||
405 | int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb) | |
406 | { | |
407 | if (lapb->callbacks.data_indication) | |
408 | return lapb->callbacks.data_indication(lapb->dev, skb); | |
409 | ||
410 | kfree_skb(skb); | |
0e8635a8 | 411 | return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */ |
1da177e4 LT |
412 | } |
413 | ||
414 | int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb) | |
415 | { | |
416 | int used = 0; | |
417 | ||
418 | if (lapb->callbacks.data_transmit) { | |
419 | lapb->callbacks.data_transmit(lapb->dev, skb); | |
420 | used = 1; | |
421 | } | |
422 | ||
423 | return used; | |
424 | } | |
425 | ||
426 | EXPORT_SYMBOL(lapb_register); | |
427 | EXPORT_SYMBOL(lapb_unregister); | |
428 | EXPORT_SYMBOL(lapb_getparms); | |
429 | EXPORT_SYMBOL(lapb_setparms); | |
430 | EXPORT_SYMBOL(lapb_connect_request); | |
431 | EXPORT_SYMBOL(lapb_disconnect_request); | |
432 | EXPORT_SYMBOL(lapb_data_request); | |
433 | EXPORT_SYMBOL(lapb_data_received); | |
434 | ||
435 | static int __init lapb_init(void) | |
436 | { | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static void __exit lapb_exit(void) | |
441 | { | |
442 | WARN_ON(!list_empty(&lapb_list)); | |
443 | } | |
444 | ||
445 | MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); | |
446 | MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol"); | |
447 | MODULE_LICENSE("GPL"); | |
448 | ||
449 | module_init(lapb_init); | |
450 | module_exit(lapb_exit); |