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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 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 | |
a508da6c JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/errno.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/jiffies.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/sockios.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/inet.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/skbuff.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 | 35 | #include <net/sock.h> |
7c0f6ba6 | 36 | #include <linux/uaccess.h> |
1da177e4 LT |
37 | #include <linux/fcntl.h> |
38 | #include <linux/mm.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/stat.h> | |
41 | #include <linux/init.h> | |
42 | #include <net/lapb.h> | |
43 | ||
14d0e7b7 | 44 | static LIST_HEAD(lapb_list); |
1da177e4 LT |
45 | static DEFINE_RWLOCK(lapb_list_lock); |
46 | ||
47 | /* | |
56d6c3d7 | 48 | * Free an allocated lapb control block. |
1da177e4 LT |
49 | */ |
50 | static void lapb_free_cb(struct lapb_cb *lapb) | |
51 | { | |
52 | kfree(lapb); | |
53 | } | |
54 | ||
55 | static __inline__ void lapb_hold(struct lapb_cb *lapb) | |
56 | { | |
57 | atomic_inc(&lapb->refcnt); | |
58 | } | |
59 | ||
60 | static __inline__ void lapb_put(struct lapb_cb *lapb) | |
61 | { | |
62 | if (atomic_dec_and_test(&lapb->refcnt)) | |
63 | lapb_free_cb(lapb); | |
64 | } | |
65 | ||
66 | /* | |
67 | * Socket removal during an interrupt is now safe. | |
68 | */ | |
69 | static void __lapb_remove_cb(struct lapb_cb *lapb) | |
70 | { | |
71 | if (lapb->node.next) { | |
72 | list_del(&lapb->node); | |
73 | lapb_put(lapb); | |
74 | } | |
75 | } | |
75da1469 | 76 | EXPORT_SYMBOL(lapb_register); |
1da177e4 LT |
77 | |
78 | /* | |
79 | * Add a socket to the bound sockets list. | |
80 | */ | |
81 | static void __lapb_insert_cb(struct lapb_cb *lapb) | |
82 | { | |
83 | list_add(&lapb->node, &lapb_list); | |
84 | lapb_hold(lapb); | |
85 | } | |
86 | ||
87 | static struct lapb_cb *__lapb_devtostruct(struct net_device *dev) | |
88 | { | |
89 | struct list_head *entry; | |
90 | struct lapb_cb *lapb, *use = NULL; | |
91 | ||
92 | list_for_each(entry, &lapb_list) { | |
93 | lapb = list_entry(entry, struct lapb_cb, node); | |
94 | if (lapb->dev == dev) { | |
95 | use = lapb; | |
96 | break; | |
97 | } | |
98 | } | |
99 | ||
100 | if (use) | |
101 | lapb_hold(use); | |
102 | ||
103 | return use; | |
104 | } | |
105 | ||
106 | static struct lapb_cb *lapb_devtostruct(struct net_device *dev) | |
107 | { | |
108 | struct lapb_cb *rc; | |
109 | ||
110 | read_lock_bh(&lapb_list_lock); | |
111 | rc = __lapb_devtostruct(dev); | |
112 | read_unlock_bh(&lapb_list_lock); | |
113 | ||
114 | return rc; | |
115 | } | |
116 | /* | |
117 | * Create an empty LAPB control block. | |
118 | */ | |
119 | static struct lapb_cb *lapb_create_cb(void) | |
120 | { | |
0da974f4 | 121 | struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC); |
1da177e4 LT |
122 | |
123 | ||
124 | if (!lapb) | |
125 | goto out; | |
126 | ||
1da177e4 LT |
127 | skb_queue_head_init(&lapb->write_queue); |
128 | skb_queue_head_init(&lapb->ack_queue); | |
129 | ||
130 | init_timer(&lapb->t1timer); | |
131 | init_timer(&lapb->t2timer); | |
132 | ||
133 | lapb->t1 = LAPB_DEFAULT_T1; | |
134 | lapb->t2 = LAPB_DEFAULT_T2; | |
135 | lapb->n2 = LAPB_DEFAULT_N2; | |
136 | lapb->mode = LAPB_DEFAULT_MODE; | |
137 | lapb->window = LAPB_DEFAULT_WINDOW; | |
138 | lapb->state = LAPB_STATE_0; | |
139 | atomic_set(&lapb->refcnt, 1); | |
140 | out: | |
141 | return lapb; | |
142 | } | |
143 | ||
d97a077a | 144 | int lapb_register(struct net_device *dev, |
145 | const struct lapb_register_struct *callbacks) | |
1da177e4 LT |
146 | { |
147 | struct lapb_cb *lapb; | |
148 | int rc = LAPB_BADTOKEN; | |
149 | ||
150 | write_lock_bh(&lapb_list_lock); | |
151 | ||
152 | lapb = __lapb_devtostruct(dev); | |
153 | if (lapb) { | |
154 | lapb_put(lapb); | |
155 | goto out; | |
156 | } | |
157 | ||
158 | lapb = lapb_create_cb(); | |
159 | rc = LAPB_NOMEM; | |
160 | if (!lapb) | |
161 | goto out; | |
162 | ||
163 | lapb->dev = dev; | |
d97a077a | 164 | lapb->callbacks = callbacks; |
1da177e4 LT |
165 | |
166 | __lapb_insert_cb(lapb); | |
167 | ||
168 | lapb_start_t1timer(lapb); | |
169 | ||
170 | rc = LAPB_OK; | |
171 | out: | |
172 | write_unlock_bh(&lapb_list_lock); | |
173 | return rc; | |
174 | } | |
175 | ||
176 | int lapb_unregister(struct net_device *dev) | |
177 | { | |
178 | struct lapb_cb *lapb; | |
179 | int rc = LAPB_BADTOKEN; | |
180 | ||
181 | write_lock_bh(&lapb_list_lock); | |
182 | lapb = __lapb_devtostruct(dev); | |
183 | if (!lapb) | |
184 | goto out; | |
185 | ||
186 | lapb_stop_t1timer(lapb); | |
187 | lapb_stop_t2timer(lapb); | |
188 | ||
189 | lapb_clear_queues(lapb); | |
190 | ||
191 | __lapb_remove_cb(lapb); | |
192 | ||
193 | lapb_put(lapb); | |
194 | rc = LAPB_OK; | |
195 | out: | |
196 | write_unlock_bh(&lapb_list_lock); | |
197 | return rc; | |
198 | } | |
75da1469 | 199 | EXPORT_SYMBOL(lapb_unregister); |
1da177e4 LT |
200 | |
201 | int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms) | |
202 | { | |
203 | int rc = LAPB_BADTOKEN; | |
204 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
205 | ||
206 | if (!lapb) | |
207 | goto out; | |
208 | ||
209 | parms->t1 = lapb->t1 / HZ; | |
210 | parms->t2 = lapb->t2 / HZ; | |
211 | parms->n2 = lapb->n2; | |
212 | parms->n2count = lapb->n2count; | |
213 | parms->state = lapb->state; | |
214 | parms->window = lapb->window; | |
215 | parms->mode = lapb->mode; | |
216 | ||
217 | if (!timer_pending(&lapb->t1timer)) | |
218 | parms->t1timer = 0; | |
219 | else | |
220 | parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ; | |
221 | ||
222 | if (!timer_pending(&lapb->t2timer)) | |
223 | parms->t2timer = 0; | |
224 | else | |
225 | parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ; | |
226 | ||
227 | lapb_put(lapb); | |
228 | rc = LAPB_OK; | |
229 | out: | |
230 | return rc; | |
231 | } | |
75da1469 | 232 | EXPORT_SYMBOL(lapb_getparms); |
1da177e4 LT |
233 | |
234 | int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms) | |
235 | { | |
236 | int rc = LAPB_BADTOKEN; | |
237 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
238 | ||
239 | if (!lapb) | |
240 | goto out; | |
241 | ||
242 | rc = LAPB_INVALUE; | |
243 | if (parms->t1 < 1 || parms->t2 < 1 || parms->n2 < 1) | |
244 | goto out_put; | |
245 | ||
246 | if (lapb->state == LAPB_STATE_0) { | |
558e10a5 DC |
247 | if (parms->mode & LAPB_EXTENDED) { |
248 | if (parms->window < 1 || parms->window > 127) | |
249 | goto out_put; | |
250 | } else { | |
251 | if (parms->window < 1 || parms->window > 7) | |
252 | goto out_put; | |
253 | } | |
1da177e4 LT |
254 | lapb->mode = parms->mode; |
255 | lapb->window = parms->window; | |
256 | } | |
257 | ||
258 | lapb->t1 = parms->t1 * HZ; | |
259 | lapb->t2 = parms->t2 * HZ; | |
260 | lapb->n2 = parms->n2; | |
261 | ||
262 | rc = LAPB_OK; | |
263 | out_put: | |
264 | lapb_put(lapb); | |
265 | out: | |
266 | return rc; | |
267 | } | |
75da1469 | 268 | EXPORT_SYMBOL(lapb_setparms); |
1da177e4 LT |
269 | |
270 | int lapb_connect_request(struct net_device *dev) | |
271 | { | |
272 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
273 | int rc = LAPB_BADTOKEN; | |
274 | ||
275 | if (!lapb) | |
276 | goto out; | |
277 | ||
278 | rc = LAPB_OK; | |
279 | if (lapb->state == LAPB_STATE_1) | |
280 | goto out_put; | |
281 | ||
282 | rc = LAPB_CONNECTED; | |
283 | if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4) | |
284 | goto out_put; | |
285 | ||
286 | lapb_establish_data_link(lapb); | |
287 | ||
a508da6c | 288 | lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev); |
1da177e4 LT |
289 | lapb->state = LAPB_STATE_1; |
290 | ||
291 | rc = LAPB_OK; | |
292 | out_put: | |
293 | lapb_put(lapb); | |
294 | out: | |
295 | return rc; | |
296 | } | |
75da1469 | 297 | EXPORT_SYMBOL(lapb_connect_request); |
1da177e4 LT |
298 | |
299 | int lapb_disconnect_request(struct net_device *dev) | |
300 | { | |
301 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
302 | int rc = LAPB_BADTOKEN; | |
303 | ||
304 | if (!lapb) | |
305 | goto out; | |
306 | ||
307 | switch (lapb->state) { | |
fcb261f3 JP |
308 | case LAPB_STATE_0: |
309 | rc = LAPB_NOTCONNECTED; | |
310 | goto out_put; | |
1da177e4 | 311 | |
fcb261f3 | 312 | case LAPB_STATE_1: |
a508da6c JP |
313 | lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev); |
314 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); | |
fcb261f3 JP |
315 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); |
316 | lapb->state = LAPB_STATE_0; | |
317 | lapb_start_t1timer(lapb); | |
318 | rc = LAPB_NOTCONNECTED; | |
319 | goto out_put; | |
320 | ||
321 | case LAPB_STATE_2: | |
322 | rc = LAPB_OK; | |
323 | goto out_put; | |
1da177e4 LT |
324 | } |
325 | ||
326 | lapb_clear_queues(lapb); | |
327 | lapb->n2count = 0; | |
328 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); | |
329 | lapb_start_t1timer(lapb); | |
330 | lapb_stop_t2timer(lapb); | |
331 | lapb->state = LAPB_STATE_2; | |
332 | ||
a508da6c JP |
333 | lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev); |
334 | lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev); | |
1da177e4 LT |
335 | |
336 | rc = LAPB_OK; | |
337 | out_put: | |
338 | lapb_put(lapb); | |
339 | out: | |
340 | return rc; | |
341 | } | |
75da1469 | 342 | EXPORT_SYMBOL(lapb_disconnect_request); |
1da177e4 LT |
343 | |
344 | int lapb_data_request(struct net_device *dev, struct sk_buff *skb) | |
345 | { | |
346 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
347 | int rc = LAPB_BADTOKEN; | |
348 | ||
349 | if (!lapb) | |
350 | goto out; | |
351 | ||
352 | rc = LAPB_NOTCONNECTED; | |
353 | if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4) | |
354 | goto out_put; | |
355 | ||
356 | skb_queue_tail(&lapb->write_queue, skb); | |
357 | lapb_kick(lapb); | |
358 | rc = LAPB_OK; | |
359 | out_put: | |
360 | lapb_put(lapb); | |
361 | out: | |
362 | return rc; | |
363 | } | |
75da1469 | 364 | EXPORT_SYMBOL(lapb_data_request); |
1da177e4 LT |
365 | |
366 | int lapb_data_received(struct net_device *dev, struct sk_buff *skb) | |
367 | { | |
368 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
369 | int rc = LAPB_BADTOKEN; | |
370 | ||
371 | if (lapb) { | |
372 | lapb_data_input(lapb, skb); | |
373 | lapb_put(lapb); | |
374 | rc = LAPB_OK; | |
375 | } | |
376 | ||
377 | return rc; | |
378 | } | |
75da1469 | 379 | EXPORT_SYMBOL(lapb_data_received); |
1da177e4 LT |
380 | |
381 | void lapb_connect_confirmation(struct lapb_cb *lapb, int reason) | |
382 | { | |
d97a077a | 383 | if (lapb->callbacks->connect_confirmation) |
384 | lapb->callbacks->connect_confirmation(lapb->dev, reason); | |
1da177e4 LT |
385 | } |
386 | ||
387 | void lapb_connect_indication(struct lapb_cb *lapb, int reason) | |
388 | { | |
d97a077a | 389 | if (lapb->callbacks->connect_indication) |
390 | lapb->callbacks->connect_indication(lapb->dev, reason); | |
1da177e4 LT |
391 | } |
392 | ||
393 | void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason) | |
394 | { | |
d97a077a | 395 | if (lapb->callbacks->disconnect_confirmation) |
396 | lapb->callbacks->disconnect_confirmation(lapb->dev, reason); | |
1da177e4 LT |
397 | } |
398 | ||
399 | void lapb_disconnect_indication(struct lapb_cb *lapb, int reason) | |
400 | { | |
d97a077a | 401 | if (lapb->callbacks->disconnect_indication) |
402 | lapb->callbacks->disconnect_indication(lapb->dev, reason); | |
1da177e4 LT |
403 | } |
404 | ||
405 | int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb) | |
406 | { | |
d97a077a | 407 | if (lapb->callbacks->data_indication) |
408 | return lapb->callbacks->data_indication(lapb->dev, skb); | |
1da177e4 LT |
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 | ||
d97a077a | 418 | if (lapb->callbacks->data_transmit) { |
419 | lapb->callbacks->data_transmit(lapb->dev, skb); | |
1da177e4 LT |
420 | used = 1; |
421 | } | |
422 | ||
423 | return used; | |
424 | } | |
425 | ||
1da177e4 LT |
426 | static int __init lapb_init(void) |
427 | { | |
428 | return 0; | |
429 | } | |
430 | ||
431 | static void __exit lapb_exit(void) | |
432 | { | |
433 | WARN_ON(!list_empty(&lapb_list)); | |
434 | } | |
435 | ||
436 | MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); | |
437 | MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol"); | |
438 | MODULE_LICENSE("GPL"); | |
439 | ||
440 | module_init(lapb_init); | |
441 | module_exit(lapb_exit); |