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 LT |
35 | #include <net/sock.h> |
36 | #include <asm/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 | } | |
76 | ||
77 | /* | |
78 | * Add a socket to the bound sockets list. | |
79 | */ | |
80 | static void __lapb_insert_cb(struct lapb_cb *lapb) | |
81 | { | |
82 | list_add(&lapb->node, &lapb_list); | |
83 | lapb_hold(lapb); | |
84 | } | |
85 | ||
86 | static struct lapb_cb *__lapb_devtostruct(struct net_device *dev) | |
87 | { | |
88 | struct list_head *entry; | |
89 | struct lapb_cb *lapb, *use = NULL; | |
90 | ||
91 | list_for_each(entry, &lapb_list) { | |
92 | lapb = list_entry(entry, struct lapb_cb, node); | |
93 | if (lapb->dev == dev) { | |
94 | use = lapb; | |
95 | break; | |
96 | } | |
97 | } | |
98 | ||
99 | if (use) | |
100 | lapb_hold(use); | |
101 | ||
102 | return use; | |
103 | } | |
104 | ||
105 | static struct lapb_cb *lapb_devtostruct(struct net_device *dev) | |
106 | { | |
107 | struct lapb_cb *rc; | |
108 | ||
109 | read_lock_bh(&lapb_list_lock); | |
110 | rc = __lapb_devtostruct(dev); | |
111 | read_unlock_bh(&lapb_list_lock); | |
112 | ||
113 | return rc; | |
114 | } | |
115 | /* | |
116 | * Create an empty LAPB control block. | |
117 | */ | |
118 | static struct lapb_cb *lapb_create_cb(void) | |
119 | { | |
0da974f4 | 120 | struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC); |
1da177e4 LT |
121 | |
122 | ||
123 | if (!lapb) | |
124 | goto out; | |
125 | ||
1da177e4 LT |
126 | skb_queue_head_init(&lapb->write_queue); |
127 | skb_queue_head_init(&lapb->ack_queue); | |
128 | ||
129 | init_timer(&lapb->t1timer); | |
130 | init_timer(&lapb->t2timer); | |
131 | ||
132 | lapb->t1 = LAPB_DEFAULT_T1; | |
133 | lapb->t2 = LAPB_DEFAULT_T2; | |
134 | lapb->n2 = LAPB_DEFAULT_N2; | |
135 | lapb->mode = LAPB_DEFAULT_MODE; | |
136 | lapb->window = LAPB_DEFAULT_WINDOW; | |
137 | lapb->state = LAPB_STATE_0; | |
138 | atomic_set(&lapb->refcnt, 1); | |
139 | out: | |
140 | return lapb; | |
141 | } | |
142 | ||
d97a077a | 143 | int lapb_register(struct net_device *dev, |
144 | const struct lapb_register_struct *callbacks) | |
1da177e4 LT |
145 | { |
146 | struct lapb_cb *lapb; | |
147 | int rc = LAPB_BADTOKEN; | |
148 | ||
149 | write_lock_bh(&lapb_list_lock); | |
150 | ||
151 | lapb = __lapb_devtostruct(dev); | |
152 | if (lapb) { | |
153 | lapb_put(lapb); | |
154 | goto out; | |
155 | } | |
156 | ||
157 | lapb = lapb_create_cb(); | |
158 | rc = LAPB_NOMEM; | |
159 | if (!lapb) | |
160 | goto out; | |
161 | ||
162 | lapb->dev = dev; | |
d97a077a | 163 | lapb->callbacks = callbacks; |
1da177e4 LT |
164 | |
165 | __lapb_insert_cb(lapb); | |
166 | ||
167 | lapb_start_t1timer(lapb); | |
168 | ||
169 | rc = LAPB_OK; | |
170 | out: | |
171 | write_unlock_bh(&lapb_list_lock); | |
172 | return rc; | |
173 | } | |
174 | ||
175 | int lapb_unregister(struct net_device *dev) | |
176 | { | |
177 | struct lapb_cb *lapb; | |
178 | int rc = LAPB_BADTOKEN; | |
179 | ||
180 | write_lock_bh(&lapb_list_lock); | |
181 | lapb = __lapb_devtostruct(dev); | |
182 | if (!lapb) | |
183 | goto out; | |
184 | ||
185 | lapb_stop_t1timer(lapb); | |
186 | lapb_stop_t2timer(lapb); | |
187 | ||
188 | lapb_clear_queues(lapb); | |
189 | ||
190 | __lapb_remove_cb(lapb); | |
191 | ||
192 | lapb_put(lapb); | |
193 | rc = LAPB_OK; | |
194 | out: | |
195 | write_unlock_bh(&lapb_list_lock); | |
196 | return rc; | |
197 | } | |
198 | ||
199 | int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms) | |
200 | { | |
201 | int rc = LAPB_BADTOKEN; | |
202 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
203 | ||
204 | if (!lapb) | |
205 | goto out; | |
206 | ||
207 | parms->t1 = lapb->t1 / HZ; | |
208 | parms->t2 = lapb->t2 / HZ; | |
209 | parms->n2 = lapb->n2; | |
210 | parms->n2count = lapb->n2count; | |
211 | parms->state = lapb->state; | |
212 | parms->window = lapb->window; | |
213 | parms->mode = lapb->mode; | |
214 | ||
215 | if (!timer_pending(&lapb->t1timer)) | |
216 | parms->t1timer = 0; | |
217 | else | |
218 | parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ; | |
219 | ||
220 | if (!timer_pending(&lapb->t2timer)) | |
221 | parms->t2timer = 0; | |
222 | else | |
223 | parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ; | |
224 | ||
225 | lapb_put(lapb); | |
226 | rc = LAPB_OK; | |
227 | out: | |
228 | return rc; | |
229 | } | |
230 | ||
231 | int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms) | |
232 | { | |
233 | int rc = LAPB_BADTOKEN; | |
234 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
235 | ||
236 | if (!lapb) | |
237 | goto out; | |
238 | ||
239 | rc = LAPB_INVALUE; | |
240 | if (parms->t1 < 1 || parms->t2 < 1 || parms->n2 < 1) | |
241 | goto out_put; | |
242 | ||
243 | if (lapb->state == LAPB_STATE_0) { | |
558e10a5 DC |
244 | if (parms->mode & LAPB_EXTENDED) { |
245 | if (parms->window < 1 || parms->window > 127) | |
246 | goto out_put; | |
247 | } else { | |
248 | if (parms->window < 1 || parms->window > 7) | |
249 | goto out_put; | |
250 | } | |
1da177e4 LT |
251 | lapb->mode = parms->mode; |
252 | lapb->window = parms->window; | |
253 | } | |
254 | ||
255 | lapb->t1 = parms->t1 * HZ; | |
256 | lapb->t2 = parms->t2 * HZ; | |
257 | lapb->n2 = parms->n2; | |
258 | ||
259 | rc = LAPB_OK; | |
260 | out_put: | |
261 | lapb_put(lapb); | |
262 | out: | |
263 | return rc; | |
264 | } | |
265 | ||
266 | int lapb_connect_request(struct net_device *dev) | |
267 | { | |
268 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
269 | int rc = LAPB_BADTOKEN; | |
270 | ||
271 | if (!lapb) | |
272 | goto out; | |
273 | ||
274 | rc = LAPB_OK; | |
275 | if (lapb->state == LAPB_STATE_1) | |
276 | goto out_put; | |
277 | ||
278 | rc = LAPB_CONNECTED; | |
279 | if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4) | |
280 | goto out_put; | |
281 | ||
282 | lapb_establish_data_link(lapb); | |
283 | ||
a508da6c | 284 | lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev); |
1da177e4 LT |
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) { | |
fcb261f3 JP |
303 | case LAPB_STATE_0: |
304 | rc = LAPB_NOTCONNECTED; | |
305 | goto out_put; | |
1da177e4 | 306 | |
fcb261f3 | 307 | case LAPB_STATE_1: |
a508da6c JP |
308 | lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev); |
309 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); | |
fcb261f3 JP |
310 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); |
311 | lapb->state = LAPB_STATE_0; | |
312 | lapb_start_t1timer(lapb); | |
313 | rc = LAPB_NOTCONNECTED; | |
314 | goto out_put; | |
315 | ||
316 | case LAPB_STATE_2: | |
317 | rc = LAPB_OK; | |
318 | goto out_put; | |
1da177e4 LT |
319 | } |
320 | ||
321 | lapb_clear_queues(lapb); | |
322 | lapb->n2count = 0; | |
323 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); | |
324 | lapb_start_t1timer(lapb); | |
325 | lapb_stop_t2timer(lapb); | |
326 | lapb->state = LAPB_STATE_2; | |
327 | ||
a508da6c JP |
328 | lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev); |
329 | lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev); | |
1da177e4 LT |
330 | |
331 | rc = LAPB_OK; | |
332 | out_put: | |
333 | lapb_put(lapb); | |
334 | out: | |
335 | return rc; | |
336 | } | |
337 | ||
338 | int lapb_data_request(struct net_device *dev, struct sk_buff *skb) | |
339 | { | |
340 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
341 | int rc = LAPB_BADTOKEN; | |
342 | ||
343 | if (!lapb) | |
344 | goto out; | |
345 | ||
346 | rc = LAPB_NOTCONNECTED; | |
347 | if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4) | |
348 | goto out_put; | |
349 | ||
350 | skb_queue_tail(&lapb->write_queue, skb); | |
351 | lapb_kick(lapb); | |
352 | rc = LAPB_OK; | |
353 | out_put: | |
354 | lapb_put(lapb); | |
355 | out: | |
356 | return rc; | |
357 | } | |
358 | ||
359 | int lapb_data_received(struct net_device *dev, struct sk_buff *skb) | |
360 | { | |
361 | struct lapb_cb *lapb = lapb_devtostruct(dev); | |
362 | int rc = LAPB_BADTOKEN; | |
363 | ||
364 | if (lapb) { | |
365 | lapb_data_input(lapb, skb); | |
366 | lapb_put(lapb); | |
367 | rc = LAPB_OK; | |
368 | } | |
369 | ||
370 | return rc; | |
371 | } | |
372 | ||
373 | void lapb_connect_confirmation(struct lapb_cb *lapb, int reason) | |
374 | { | |
d97a077a | 375 | if (lapb->callbacks->connect_confirmation) |
376 | lapb->callbacks->connect_confirmation(lapb->dev, reason); | |
1da177e4 LT |
377 | } |
378 | ||
379 | void lapb_connect_indication(struct lapb_cb *lapb, int reason) | |
380 | { | |
d97a077a | 381 | if (lapb->callbacks->connect_indication) |
382 | lapb->callbacks->connect_indication(lapb->dev, reason); | |
1da177e4 LT |
383 | } |
384 | ||
385 | void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason) | |
386 | { | |
d97a077a | 387 | if (lapb->callbacks->disconnect_confirmation) |
388 | lapb->callbacks->disconnect_confirmation(lapb->dev, reason); | |
1da177e4 LT |
389 | } |
390 | ||
391 | void lapb_disconnect_indication(struct lapb_cb *lapb, int reason) | |
392 | { | |
d97a077a | 393 | if (lapb->callbacks->disconnect_indication) |
394 | lapb->callbacks->disconnect_indication(lapb->dev, reason); | |
1da177e4 LT |
395 | } |
396 | ||
397 | int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb) | |
398 | { | |
d97a077a | 399 | if (lapb->callbacks->data_indication) |
400 | return lapb->callbacks->data_indication(lapb->dev, skb); | |
1da177e4 LT |
401 | |
402 | kfree_skb(skb); | |
0e8635a8 | 403 | return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */ |
1da177e4 LT |
404 | } |
405 | ||
406 | int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb) | |
407 | { | |
408 | int used = 0; | |
409 | ||
d97a077a | 410 | if (lapb->callbacks->data_transmit) { |
411 | lapb->callbacks->data_transmit(lapb->dev, skb); | |
1da177e4 LT |
412 | used = 1; |
413 | } | |
414 | ||
415 | return used; | |
416 | } | |
417 | ||
418 | EXPORT_SYMBOL(lapb_register); | |
419 | EXPORT_SYMBOL(lapb_unregister); | |
420 | EXPORT_SYMBOL(lapb_getparms); | |
421 | EXPORT_SYMBOL(lapb_setparms); | |
422 | EXPORT_SYMBOL(lapb_connect_request); | |
423 | EXPORT_SYMBOL(lapb_disconnect_request); | |
424 | EXPORT_SYMBOL(lapb_data_request); | |
425 | EXPORT_SYMBOL(lapb_data_received); | |
426 | ||
427 | static int __init lapb_init(void) | |
428 | { | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static void __exit lapb_exit(void) | |
433 | { | |
434 | WARN_ON(!list_empty(&lapb_list)); | |
435 | } | |
436 | ||
437 | MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); | |
438 | MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol"); | |
439 | MODULE_LICENSE("GPL"); | |
440 | ||
441 | module_init(lapb_init); | |
442 | module_exit(lapb_exit); |