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-rw-r--r--net/lapb/lapb_iface.c449
1 files changed, 449 insertions, 0 deletions
diff --git a/net/lapb/lapb_iface.c b/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#include <linux/module.h>
19#include <linux/errno.h>
20#include <linux/types.h>
21#include <linux/socket.h>
22#include <linux/in.h>
23#include <linux/kernel.h>
24#include <linux/jiffies.h>
25#include <linux/timer.h>
26#include <linux/string.h>
27#include <linux/sockios.h>
28#include <linux/net.h>
29#include <linux/inet.h>
30#include <linux/if_arp.h>
31#include <linux/skbuff.h>
32#include <net/sock.h>
33#include <asm/uaccess.h>
34#include <asm/system.h>
35#include <linux/fcntl.h>
36#include <linux/mm.h>
37#include <linux/interrupt.h>
38#include <linux/stat.h>
39#include <linux/init.h>
40#include <net/lapb.h>
41
42static struct list_head lapb_list = LIST_HEAD_INIT(lapb_list);
43static DEFINE_RWLOCK(lapb_list_lock);
44
45/*
46 * Free an allocated lapb control block.
47 */
48static void lapb_free_cb(struct lapb_cb *lapb)
49{
50 kfree(lapb);
51}
52
53static __inline__ void lapb_hold(struct lapb_cb *lapb)
54{
55 atomic_inc(&lapb->refcnt);
56}
57
58static __inline__ void lapb_put(struct lapb_cb *lapb)
59{
60 if (atomic_dec_and_test(&lapb->refcnt))
61 lapb_free_cb(lapb);
62}
63
64/*
65 * Socket removal during an interrupt is now safe.
66 */
67static void __lapb_remove_cb(struct lapb_cb *lapb)
68{
69 if (lapb->node.next) {
70 list_del(&lapb->node);
71 lapb_put(lapb);
72 }
73}
74
75/*
76 * Add a socket to the bound sockets list.
77 */
78static void __lapb_insert_cb(struct lapb_cb *lapb)
79{
80 list_add(&lapb->node, &lapb_list);
81 lapb_hold(lapb);
82}
83
84static struct lapb_cb *__lapb_devtostruct(struct net_device *dev)
85{
86 struct list_head *entry;
87 struct lapb_cb *lapb, *use = NULL;
88
89 list_for_each(entry, &lapb_list) {
90 lapb = list_entry(entry, struct lapb_cb, node);
91 if (lapb->dev == dev) {
92 use = lapb;
93 break;
94 }
95 }
96
97 if (use)
98 lapb_hold(use);
99
100 return use;
101}
102
103static struct lapb_cb *lapb_devtostruct(struct net_device *dev)
104{
105 struct lapb_cb *rc;
106
107 read_lock_bh(&lapb_list_lock);
108 rc = __lapb_devtostruct(dev);
109 read_unlock_bh(&lapb_list_lock);
110
111 return rc;
112}
113/*
114 * Create an empty LAPB control block.
115 */
116static struct lapb_cb *lapb_create_cb(void)
117{
118 struct lapb_cb *lapb = kmalloc(sizeof(*lapb), GFP_ATOMIC);
119
120
121 if (!lapb)
122 goto out;
123
124 memset(lapb, 0x00, sizeof(*lapb));
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);
139out:
140 return lapb;
141}
142
143int lapb_register(struct net_device *dev, struct lapb_register_struct *callbacks)
144{
145 struct lapb_cb *lapb;
146 int rc = LAPB_BADTOKEN;
147
148 write_lock_bh(&lapb_list_lock);
149
150 lapb = __lapb_devtostruct(dev);
151 if (lapb) {
152 lapb_put(lapb);
153 goto out;
154 }
155
156 lapb = lapb_create_cb();
157 rc = LAPB_NOMEM;
158 if (!lapb)
159 goto out;
160
161 lapb->dev = dev;
162 lapb->callbacks = *callbacks;
163
164 __lapb_insert_cb(lapb);
165
166 lapb_start_t1timer(lapb);
167
168 rc = LAPB_OK;
169out:
170 write_unlock_bh(&lapb_list_lock);
171 return rc;
172}
173
174int lapb_unregister(struct net_device *dev)
175{
176 struct lapb_cb *lapb;
177 int rc = LAPB_BADTOKEN;
178
179 write_lock_bh(&lapb_list_lock);
180 lapb = __lapb_devtostruct(dev);
181 if (!lapb)
182 goto out;
183
184 lapb_stop_t1timer(lapb);
185 lapb_stop_t2timer(lapb);
186
187 lapb_clear_queues(lapb);
188
189 __lapb_remove_cb(lapb);
190
191 lapb_put(lapb);
192 rc = LAPB_OK;
193out:
194 write_unlock_bh(&lapb_list_lock);
195 return rc;
196}
197
198int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms)
199{
200 int rc = LAPB_BADTOKEN;
201 struct lapb_cb *lapb = lapb_devtostruct(dev);
202
203 if (!lapb)
204 goto out;
205
206 parms->t1 = lapb->t1 / HZ;
207 parms->t2 = lapb->t2 / HZ;
208 parms->n2 = lapb->n2;
209 parms->n2count = lapb->n2count;
210 parms->state = lapb->state;
211 parms->window = lapb->window;
212 parms->mode = lapb->mode;
213
214 if (!timer_pending(&lapb->t1timer))
215 parms->t1timer = 0;
216 else
217 parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;
218
219 if (!timer_pending(&lapb->t2timer))
220 parms->t2timer = 0;
221 else
222 parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;
223
224 lapb_put(lapb);
225 rc = LAPB_OK;
226out:
227 return rc;
228}
229
230int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms)
231{
232 int rc = LAPB_BADTOKEN;
233 struct lapb_cb *lapb = lapb_devtostruct(dev);
234
235 if (!lapb)
236 goto out;
237
238 rc = LAPB_INVALUE;
239 if (parms->t1 < 1 || parms->t2 < 1 || parms->n2 < 1)
240 goto out_put;
241
242 if (lapb->state == LAPB_STATE_0) {
243 if (((parms->mode & LAPB_EXTENDED) &&
244 (parms->window < 1 || parms->window > 127)) ||
245 (parms->window < 1 || parms->window > 7))
246 goto out_put;
247
248 lapb->mode = parms->mode;
249 lapb->window = parms->window;
250 }
251
252 lapb->t1 = parms->t1 * HZ;
253 lapb->t2 = parms->t2 * HZ;
254 lapb->n2 = parms->n2;
255
256 rc = LAPB_OK;
257out_put:
258 lapb_put(lapb);
259out:
260 return rc;
261}
262
263int lapb_connect_request(struct net_device *dev)
264{
265 struct lapb_cb *lapb = lapb_devtostruct(dev);
266 int rc = LAPB_BADTOKEN;
267
268 if (!lapb)
269 goto out;
270
271 rc = LAPB_OK;
272 if (lapb->state == LAPB_STATE_1)
273 goto out_put;
274
275 rc = LAPB_CONNECTED;
276 if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4)
277 goto out_put;
278
279 lapb_establish_data_link(lapb);
280
281#if LAPB_DEBUG > 0
282 printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->dev);
283#endif
284 lapb->state = LAPB_STATE_1;
285
286 rc = LAPB_OK;
287out_put:
288 lapb_put(lapb);
289out:
290 return rc;
291}
292
293int lapb_disconnect_request(struct net_device *dev)
294{
295 struct lapb_cb *lapb = lapb_devtostruct(dev);
296 int rc = LAPB_BADTOKEN;
297
298 if (!lapb)
299 goto out;
300
301 switch (lapb->state) {
302 case LAPB_STATE_0:
303 rc = LAPB_NOTCONNECTED;
304 goto out_put;
305
306 case LAPB_STATE_1:
307#if LAPB_DEBUG > 1
308 printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->dev);
309#endif
310#if LAPB_DEBUG > 0
311 printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
312#endif
313 lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
314 lapb->state = LAPB_STATE_0;
315 lapb_start_t1timer(lapb);
316 rc = LAPB_NOTCONNECTED;
317 goto out_put;
318
319 case LAPB_STATE_2:
320 rc = LAPB_OK;
321 goto out_put;
322 }
323
324 lapb_clear_queues(lapb);
325 lapb->n2count = 0;
326 lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
327 lapb_start_t1timer(lapb);
328 lapb_stop_t2timer(lapb);
329 lapb->state = LAPB_STATE_2;
330
331#if LAPB_DEBUG > 1
332 printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->dev);
333#endif
334#if LAPB_DEBUG > 0
335 printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->dev);
336#endif
337
338 rc = LAPB_OK;
339out_put:
340 lapb_put(lapb);
341out:
342 return rc;
343}
344
345int lapb_data_request(struct net_device *dev, struct sk_buff *skb)
346{
347 struct lapb_cb *lapb = lapb_devtostruct(dev);
348 int rc = LAPB_BADTOKEN;
349
350 if (!lapb)
351 goto out;
352
353 rc = LAPB_NOTCONNECTED;
354 if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
355 goto out_put;
356
357 skb_queue_tail(&lapb->write_queue, skb);
358 lapb_kick(lapb);
359 rc = LAPB_OK;
360out_put:
361 lapb_put(lapb);
362out:
363 return rc;
364}
365
366int 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
380void lapb_connect_confirmation(struct lapb_cb *lapb, int reason)
381{
382 if (lapb->callbacks.connect_confirmation)
383 lapb->callbacks.connect_confirmation(lapb->dev, reason);
384}
385
386void lapb_connect_indication(struct lapb_cb *lapb, int reason)
387{
388 if (lapb->callbacks.connect_indication)
389 lapb->callbacks.connect_indication(lapb->dev, reason);
390}
391
392void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason)
393{
394 if (lapb->callbacks.disconnect_confirmation)
395 lapb->callbacks.disconnect_confirmation(lapb->dev, reason);
396}
397
398void lapb_disconnect_indication(struct lapb_cb *lapb, int reason)
399{
400 if (lapb->callbacks.disconnect_indication)
401 lapb->callbacks.disconnect_indication(lapb->dev, reason);
402}
403
404int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb)
405{
406 if (lapb->callbacks.data_indication)
407 return lapb->callbacks.data_indication(lapb->dev, skb);
408
409 kfree_skb(skb);
410 return NET_RX_CN_HIGH; /* For now; must be != NET_RX_DROP */
411}
412
413int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb)
414{
415 int used = 0;
416
417 if (lapb->callbacks.data_transmit) {
418 lapb->callbacks.data_transmit(lapb->dev, skb);
419 used = 1;
420 }
421
422 return used;
423}
424
425EXPORT_SYMBOL(lapb_register);
426EXPORT_SYMBOL(lapb_unregister);
427EXPORT_SYMBOL(lapb_getparms);
428EXPORT_SYMBOL(lapb_setparms);
429EXPORT_SYMBOL(lapb_connect_request);
430EXPORT_SYMBOL(lapb_disconnect_request);
431EXPORT_SYMBOL(lapb_data_request);
432EXPORT_SYMBOL(lapb_data_received);
433
434static int __init lapb_init(void)
435{
436 return 0;
437}
438
439static void __exit lapb_exit(void)
440{
441 WARN_ON(!list_empty(&lapb_list));
442}
443
444MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
445MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
446MODULE_LICENSE("GPL");
447
448module_init(lapb_init);
449module_exit(lapb_exit);
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