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Linux/net/lapb/lapb_iface.c

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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 EXPORT_SYMBOL(lapb_register);
 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 {
121         struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC);
122 
123 
124         if (!lapb)
125                 goto out;
126 
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 
144 int lapb_register(struct net_device *dev,
145                   const struct lapb_register_struct *callbacks)
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;
164         lapb->callbacks = callbacks;
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 }
199 EXPORT_SYMBOL(lapb_unregister);
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 }
232 EXPORT_SYMBOL(lapb_getparms);
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) {
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                 }
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 }
268 EXPORT_SYMBOL(lapb_setparms);
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 
288         lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev);
289         lapb->state = LAPB_STATE_1;
290 
291         rc = LAPB_OK;
292 out_put:
293         lapb_put(lapb);
294 out:
295         return rc;
296 }
297 EXPORT_SYMBOL(lapb_connect_request);
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) {
308         case LAPB_STATE_0:
309                 rc = LAPB_NOTCONNECTED;
310                 goto out_put;
311 
312         case LAPB_STATE_1:
313                 lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev);
314                 lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
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;
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 
333         lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev);
334         lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev);
335 
336         rc = LAPB_OK;
337 out_put:
338         lapb_put(lapb);
339 out:
340         return rc;
341 }
342 EXPORT_SYMBOL(lapb_disconnect_request);
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 }
364 EXPORT_SYMBOL(lapb_data_request);
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 }
379 EXPORT_SYMBOL(lapb_data_received);
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);
411         return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */
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 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);
442 

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