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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 
 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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