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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 | */ |
17 | |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | |
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> |
34 | #include <linux/slab.h> |
35 | #include <net/sock.h> |
36 | #include <asm/uaccess.h> |
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 | |
44 | static LIST_HEAD(lapb_list); |
45 | static DEFINE_RWLOCK(lapb_list_lock); |
46 | |
47 | /* |
48 | * Free an allocated lapb control block. |
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 | { |
120 | struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC); |
121 | |
122 | |
123 | if (!lapb) |
124 | goto out; |
125 | |
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 | |
143 | int lapb_register(struct net_device *dev, |
144 | const struct lapb_register_struct *callbacks) |
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; |
163 | lapb->callbacks = callbacks; |
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) { |
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 | } |
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 | |
284 | lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev); |
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 | lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev); |
309 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); |
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; |
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 | |
328 | lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev); |
329 | lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev); |
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 | { |
375 | if (lapb->callbacks->connect_confirmation) |
376 | lapb->callbacks->connect_confirmation(lapb->dev, reason); |
377 | } |
378 | |
379 | void lapb_connect_indication(struct lapb_cb *lapb, int reason) |
380 | { |
381 | if (lapb->callbacks->connect_indication) |
382 | lapb->callbacks->connect_indication(lapb->dev, reason); |
383 | } |
384 | |
385 | void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason) |
386 | { |
387 | if (lapb->callbacks->disconnect_confirmation) |
388 | lapb->callbacks->disconnect_confirmation(lapb->dev, reason); |
389 | } |
390 | |
391 | void lapb_disconnect_indication(struct lapb_cb *lapb, int reason) |
392 | { |
393 | if (lapb->callbacks->disconnect_indication) |
394 | lapb->callbacks->disconnect_indication(lapb->dev, reason); |
395 | } |
396 | |
397 | int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb) |
398 | { |
399 | if (lapb->callbacks->data_indication) |
400 | return lapb->callbacks->data_indication(lapb->dev, skb); |
401 | |
402 | kfree_skb(skb); |
403 | return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */ |
404 | } |
405 | |
406 | int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb) |
407 | { |
408 | int used = 0; |
409 | |
410 | if (lapb->callbacks->data_transmit) { |
411 | lapb->callbacks->data_transmit(lapb->dev, skb); |
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); |
443 |
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