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Staging: netwave: delete the driver
[linux/fpc-iii.git] / drivers / net / wan / x25_asy.c
blob80d5c5834a0bf976c0446a02e7a3050823158c4a
1 /*
2 * Things to sort out:
3 *
4 * o tbusy handling
5 * o allow users to set the parameters
6 * o sync/async switching ?
7 *
8 * Note: This does _not_ implement CCITT X.25 asynchronous framing
9 * recommendations. Its primarily for testing purposes. If you wanted
10 * to do CCITT then in theory all you need is to nick the HDLC async
11 * checksum routines from ppp.c
12 * Changes:
13 *
14 * 2000-10-29 Henner Eisen lapb_data_indication() return status.
15 */
16
17 #include <linux/module.h>
18
19 #include <asm/system.h>
20 #include <linux/uaccess.h>
21 #include <linux/bitops.h>
22 #include <linux/string.h>
23 #include <linux/mm.h>
24 #include <linux/interrupt.h>
25 #include <linux/in.h>
26 #include <linux/tty.h>
27 #include <linux/errno.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
31 #include <linux/if_arp.h>
32 #include <linux/x25.h>
33 #include <linux/lapb.h>
34 #include <linux/init.h>
35 #include <linux/rtnetlink.h>
36 #include <linux/compat.h>
37 #include <linux/slab.h>
38 #include "x25_asy.h"
39
40 #include <net/x25device.h>
41
42 static struct net_device **x25_asy_devs;
43 static int x25_asy_maxdev = SL_NRUNIT;
44
45 module_param(x25_asy_maxdev, int, 0);
46 MODULE_LICENSE("GPL");
47
48 static int x25_asy_esc(unsigned char *p, unsigned char *d, int len);
49 static void x25_asy_unesc(struct x25_asy *sl, unsigned char c);
50 static void x25_asy_setup(struct net_device *dev);
51
52 /* Find a free X.25 channel, and link in this `tty' line. */
53 static struct x25_asy *x25_asy_alloc(void)
54 {
55 struct net_device *dev = NULL;
56 struct x25_asy *sl;
57 int i;
58
59 if (x25_asy_devs == NULL)
60 return NULL; /* Master array missing ! */
61
62 for (i = 0; i < x25_asy_maxdev; i++) {
63 dev = x25_asy_devs[i];
64
65 /* Not allocated ? */
66 if (dev == NULL)
67 break;
68
69 sl = netdev_priv(dev);
70 /* Not in use ? */
71 if (!test_and_set_bit(SLF_INUSE, &sl->flags))
72 return sl;
73 }
74
75
76 /* Sorry, too many, all slots in use */
77 if (i >= x25_asy_maxdev)
78 return NULL;
79
80 /* If no channels are available, allocate one */
81 if (!dev) {
82 char name[IFNAMSIZ];
83 sprintf(name, "x25asy%d", i);
84
85 dev = alloc_netdev(sizeof(struct x25_asy),
86 name, x25_asy_setup);
87 if (!dev)
88 return NULL;
89
90 /* Initialize channel control data */
91 sl = netdev_priv(dev);
92 dev->base_addr = i;
93
94 /* register device so that it can be ifconfig'ed */
95 if (register_netdev(dev) == 0) {
96 /* (Re-)Set the INUSE bit. Very Important! */
97 set_bit(SLF_INUSE, &sl->flags);
98 x25_asy_devs[i] = dev;
99 return sl;
100 } else {
101 printk(KERN_WARNING "x25_asy_alloc() - register_netdev() failure.\n");
102 free_netdev(dev);
103 }
104 }
105 return NULL;
106 }
107
108
109 /* Free an X.25 channel. */
110 static void x25_asy_free(struct x25_asy *sl)
111 {
112 /* Free all X.25 frame buffers. */
113 kfree(sl->rbuff);
114 sl->rbuff = NULL;
115 kfree(sl->xbuff);
116 sl->xbuff = NULL;
117
118 if (!test_and_clear_bit(SLF_INUSE, &sl->flags))
119 printk(KERN_ERR "%s: x25_asy_free for already free unit.\n",
120 sl->dev->name);
121 }
122
123 static int x25_asy_change_mtu(struct net_device *dev, int newmtu)
124 {
125 struct x25_asy *sl = netdev_priv(dev);
126 unsigned char *xbuff, *rbuff;
127 int len = 2 * newmtu;
128
129 xbuff = kmalloc(len + 4, GFP_ATOMIC);
130 rbuff = kmalloc(len + 4, GFP_ATOMIC);
131
132 if (xbuff == NULL || rbuff == NULL) {
133 printk(KERN_WARNING "%s: unable to grow X.25 buffers, MTU change cancelled.\n",
134 dev->name);
135 kfree(xbuff);
136 kfree(rbuff);
137 return -ENOMEM;
138 }
139
140 spin_lock_bh(&sl->lock);
141 xbuff = xchg(&sl->xbuff, xbuff);
142 if (sl->xleft) {
143 if (sl->xleft <= len) {
144 memcpy(sl->xbuff, sl->xhead, sl->xleft);
145 } else {
146 sl->xleft = 0;
147 dev->stats.tx_dropped++;
148 }
149 }
150 sl->xhead = sl->xbuff;
151
152 rbuff = xchg(&sl->rbuff, rbuff);
153 if (sl->rcount) {
154 if (sl->rcount <= len) {
155 memcpy(sl->rbuff, rbuff, sl->rcount);
156 } else {
157 sl->rcount = 0;
158 dev->stats.rx_over_errors++;
159 set_bit(SLF_ERROR, &sl->flags);
160 }
161 }
162
163 dev->mtu = newmtu;
164 sl->buffsize = len;
165
166 spin_unlock_bh(&sl->lock);
167
168 kfree(xbuff);
169 kfree(rbuff);
170 return 0;
171 }
172
173
174 /* Set the "sending" flag. This must be atomic, hence the ASM. */
175
176 static inline void x25_asy_lock(struct x25_asy *sl)
177 {
178 netif_stop_queue(sl->dev);
179 }
180
181
182 /* Clear the "sending" flag. This must be atomic, hence the ASM. */
183
184 static inline void x25_asy_unlock(struct x25_asy *sl)
185 {
186 netif_wake_queue(sl->dev);
187 }
188
189 /* Send one completely decapsulated IP datagram to the IP layer. */
190
191 static void x25_asy_bump(struct x25_asy *sl)
192 {
193 struct net_device *dev = sl->dev;
194 struct sk_buff *skb;
195 int count;
196 int err;
197
198 count = sl->rcount;
199 dev->stats.rx_bytes += count;
200
201 skb = dev_alloc_skb(count+1);
202 if (skb == NULL) {
203 printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n",
204 sl->dev->name);
205 dev->stats.rx_dropped++;
206 return;
207 }
208 skb_push(skb, 1); /* LAPB internal control */
209 memcpy(skb_put(skb, count), sl->rbuff, count);
210 skb->protocol = x25_type_trans(skb, sl->dev);
211 err = lapb_data_received(skb->dev, skb);
212 if (err != LAPB_OK) {
213 kfree_skb(skb);
214 printk(KERN_DEBUG "x25_asy: data received err - %d\n", err);
215 } else {
216 netif_rx(skb);
217 dev->stats.rx_packets++;
218 }
219 }
220
221 /* Encapsulate one IP datagram and stuff into a TTY queue. */
222 static void x25_asy_encaps(struct x25_asy *sl, unsigned char *icp, int len)
223 {
224 unsigned char *p;
225 int actual, count, mtu = sl->dev->mtu;
226
227 if (len > mtu) {
228 /* Sigh, shouldn't occur BUT ... */
229 len = mtu;
230 printk(KERN_DEBUG "%s: truncating oversized transmit packet!\n",
231 sl->dev->name);
232 sl->dev->stats.tx_dropped++;
233 x25_asy_unlock(sl);
234 return;
235 }
236
237 p = icp;
238 count = x25_asy_esc(p, (unsigned char *) sl->xbuff, len);
239
240 /* Order of next two lines is *very* important.
241 * When we are sending a little amount of data,
242 * the transfer may be completed inside driver.write()
243 * routine, because it's running with interrupts enabled.
244 * In this case we *never* got WRITE_WAKEUP event,
245 * if we did not request it before write operation.
246 * 14 Oct 1994 Dmitry Gorodchanin.
247 */
248 set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
249 actual = sl->tty->ops->write(sl->tty, sl->xbuff, count);
250 sl->xleft = count - actual;
251 sl->xhead = sl->xbuff + actual;
252 /* VSV */
253 clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */
254 }
255
256 /*
257 * Called by the driver when there's room for more data. If we have
258 * more packets to send, we send them here.
259 */
260 static void x25_asy_write_wakeup(struct tty_struct *tty)
261 {
262 int actual;
263 struct x25_asy *sl = tty->disc_data;
264
265 /* First make sure we're connected. */
266 if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev))
267 return;
268
269 if (sl->xleft <= 0) {
270 /* Now serial buffer is almost free & we can start
271 * transmission of another packet */
272 sl->dev->stats.tx_packets++;
273 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
274 x25_asy_unlock(sl);
275 return;
276 }
277
278 actual = tty->ops->write(tty, sl->xhead, sl->xleft);
279 sl->xleft -= actual;
280 sl->xhead += actual;
281 }
282
283 static void x25_asy_timeout(struct net_device *dev)
284 {
285 struct x25_asy *sl = netdev_priv(dev);
286
287 spin_lock(&sl->lock);
288 if (netif_queue_stopped(dev)) {
289 /* May be we must check transmitter timeout here ?
290 * 14 Oct 1994 Dmitry Gorodchanin.
291 */
292 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
293 (tty_chars_in_buffer(sl->tty) || sl->xleft) ?
294 "bad line quality" : "driver error");
295 sl->xleft = 0;
296 clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
297 x25_asy_unlock(sl);
298 }
299 spin_unlock(&sl->lock);
300 }
301
302 /* Encapsulate an IP datagram and kick it into a TTY queue. */
303
304 static netdev_tx_t x25_asy_xmit(struct sk_buff *skb,
305 struct net_device *dev)
306 {
307 struct x25_asy *sl = netdev_priv(dev);
308 int err;
309
310 if (!netif_running(sl->dev)) {
311 printk(KERN_ERR "%s: xmit call when iface is down\n",
312 dev->name);
313 kfree_skb(skb);
314 return NETDEV_TX_OK;
315 }
316
317 switch (skb->data[0]) {
318 case 0x00:
319 break;
320 case 0x01: /* Connection request .. do nothing */
321 err = lapb_connect_request(dev);
322 if (err != LAPB_OK)
323 printk(KERN_ERR "x25_asy: lapb_connect_request error - %d\n", err);
324 kfree_skb(skb);
325 return NETDEV_TX_OK;
326 case 0x02: /* Disconnect request .. do nothing - hang up ?? */
327 err = lapb_disconnect_request(dev);
328 if (err != LAPB_OK)
329 printk(KERN_ERR "x25_asy: lapb_disconnect_request error - %d\n", err);
330 default:
331 kfree_skb(skb);
332 return NETDEV_TX_OK;
333 }
334 skb_pull(skb, 1); /* Remove control byte */
335 /*
336 * If we are busy already- too bad. We ought to be able
337 * to queue things at this point, to allow for a little
338 * frame buffer. Oh well...
339 * -----------------------------------------------------
340 * I hate queues in X.25 driver. May be it's efficient,
341 * but for me latency is more important. ;)
342 * So, no queues !
343 * 14 Oct 1994 Dmitry Gorodchanin.
344 */
345
346 err = lapb_data_request(dev, skb);
347 if (err != LAPB_OK) {
348 printk(KERN_ERR "x25_asy: lapb_data_request error - %d\n", err);
349 kfree_skb(skb);
350 return NETDEV_TX_OK;
351 }
352 return NETDEV_TX_OK;
353 }
354
355
356 /*
357 * LAPB interface boilerplate
358 */
359
360 /*
361 * Called when I frame data arrives. We did the work above - throw it
362 * at the net layer.
363 */
364
365 static int x25_asy_data_indication(struct net_device *dev, struct sk_buff *skb)
366 {
367 return netif_rx(skb);
368 }
369
370 /*
371 * Data has emerged from the LAPB protocol machine. We don't handle
372 * busy cases too well. Its tricky to see how to do this nicely -
373 * perhaps lapb should allow us to bounce this ?
374 */
375
376 static void x25_asy_data_transmit(struct net_device *dev, struct sk_buff *skb)
377 {
378 struct x25_asy *sl = netdev_priv(dev);
379
380 spin_lock(&sl->lock);
381 if (netif_queue_stopped(sl->dev) || sl->tty == NULL) {
382 spin_unlock(&sl->lock);
383 printk(KERN_ERR "x25_asy: tbusy drop\n");
384 kfree_skb(skb);
385 return;
386 }
387 /* We were not busy, so we are now... :-) */
388 if (skb != NULL) {
389 x25_asy_lock(sl);
390 dev->stats.tx_bytes += skb->len;
391 x25_asy_encaps(sl, skb->data, skb->len);
392 dev_kfree_skb(skb);
393 }
394 spin_unlock(&sl->lock);
395 }
396
397 /*
398 * LAPB connection establish/down information.
399 */
400
401 static void x25_asy_connected(struct net_device *dev, int reason)
402 {
403 struct x25_asy *sl = netdev_priv(dev);
404 struct sk_buff *skb;
405 unsigned char *ptr;
406
407 skb = dev_alloc_skb(1);
408 if (skb == NULL) {
409 printk(KERN_ERR "x25_asy: out of memory\n");
410 return;
411 }
412
413 ptr = skb_put(skb, 1);
414 *ptr = 0x01;
415
416 skb->protocol = x25_type_trans(skb, sl->dev);
417 netif_rx(skb);
418 }
419
420 static void x25_asy_disconnected(struct net_device *dev, int reason)
421 {
422 struct x25_asy *sl = netdev_priv(dev);
423 struct sk_buff *skb;
424 unsigned char *ptr;
425
426 skb = dev_alloc_skb(1);
427 if (skb == NULL) {
428 printk(KERN_ERR "x25_asy: out of memory\n");
429 return;
430 }
431
432 ptr = skb_put(skb, 1);
433 *ptr = 0x02;
434
435 skb->protocol = x25_type_trans(skb, sl->dev);
436 netif_rx(skb);
437 }
438
439 static struct lapb_register_struct x25_asy_callbacks = {
440 .connect_confirmation = x25_asy_connected,
441 .connect_indication = x25_asy_connected,
442 .disconnect_confirmation = x25_asy_disconnected,
443 .disconnect_indication = x25_asy_disconnected,
444 .data_indication = x25_asy_data_indication,
445 .data_transmit = x25_asy_data_transmit,
446
447 };
448
449
450 /* Open the low-level part of the X.25 channel. Easy! */
451 static int x25_asy_open(struct net_device *dev)
452 {
453 struct x25_asy *sl = netdev_priv(dev);
454 unsigned long len;
455 int err;
456
457 if (sl->tty == NULL)
458 return -ENODEV;
459
460 /*
461 * Allocate the X.25 frame buffers:
462 *
463 * rbuff Receive buffer.
464 * xbuff Transmit buffer.
465 */
466
467 len = dev->mtu * 2;
468
469 sl->rbuff = kmalloc(len + 4, GFP_KERNEL);
470 if (sl->rbuff == NULL)
471 goto norbuff;
472 sl->xbuff = kmalloc(len + 4, GFP_KERNEL);
473 if (sl->xbuff == NULL)
474 goto noxbuff;
475
476 sl->buffsize = len;
477 sl->rcount = 0;
478 sl->xleft = 0;
479 sl->flags &= (1 << SLF_INUSE); /* Clear ESCAPE & ERROR flags */
480
481 netif_start_queue(dev);
482
483 /*
484 * Now attach LAPB
485 */
486 err = lapb_register(dev, &x25_asy_callbacks);
487 if (err == LAPB_OK)
488 return 0;
489
490 /* Cleanup */
491 kfree(sl->xbuff);
492 noxbuff:
493 kfree(sl->rbuff);
494 norbuff:
495 return -ENOMEM;
496 }
497
498
499 /* Close the low-level part of the X.25 channel. Easy! */
500 static int x25_asy_close(struct net_device *dev)
501 {
502 struct x25_asy *sl = netdev_priv(dev);
503 int err;
504
505 spin_lock(&sl->lock);
506 if (sl->tty)
507 clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
508
509 netif_stop_queue(dev);
510 sl->rcount = 0;
511 sl->xleft = 0;
512 err = lapb_unregister(dev);
513 if (err != LAPB_OK)
514 printk(KERN_ERR "x25_asy_close: lapb_unregister error -%d\n",
515 err);
516 spin_unlock(&sl->lock);
517 return 0;
518 }
519
520 /*
521 * Handle the 'receiver data ready' interrupt.
522 * This function is called by the 'tty_io' module in the kernel when
523 * a block of X.25 data has been received, which can now be decapsulated
524 * and sent on to some IP layer for further processing.
525 */
526
527 static void x25_asy_receive_buf(struct tty_struct *tty,
528 const unsigned char *cp, char *fp, int count)
529 {
530 struct x25_asy *sl = tty->disc_data;
531
532 if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev))
533 return;
534
535
536 /* Read the characters out of the buffer */
537 while (count--) {
538 if (fp && *fp++) {
539 if (!test_and_set_bit(SLF_ERROR, &sl->flags))
540 sl->dev->stats.rx_errors++;
541 cp++;
542 continue;
543 }
544 x25_asy_unesc(sl, *cp++);
545 }
546 }
547
548 /*
549 * Open the high-level part of the X.25 channel.
550 * This function is called by the TTY module when the
551 * X.25 line discipline is called for. Because we are
552 * sure the tty line exists, we only have to link it to
553 * a free X.25 channel...
554 */
555
556 static int x25_asy_open_tty(struct tty_struct *tty)
557 {
558 struct x25_asy *sl = tty->disc_data;
559 int err;
560
561 if (tty->ops->write == NULL)
562 return -EOPNOTSUPP;
563
564 /* First make sure we're not already connected. */
565 if (sl && sl->magic == X25_ASY_MAGIC)
566 return -EEXIST;
567
568 /* OK. Find a free X.25 channel to use. */
569 sl = x25_asy_alloc();
570 if (sl == NULL)
571 return -ENFILE;
572
573 sl->tty = tty;
574 tty->disc_data = sl;
575 tty->receive_room = 65536;
576 tty_driver_flush_buffer(tty);
577 tty_ldisc_flush(tty);
578
579 /* Restore default settings */
580 sl->dev->type = ARPHRD_X25;
581
582 /* Perform the low-level X.25 async init */
583 err = x25_asy_open(sl->dev);
584 if (err)
585 return err;
586 /* Done. We have linked the TTY line to a channel. */
587 return sl->dev->base_addr;
588 }
589
590
591 /*
592 * Close down an X.25 channel.
593 * This means flushing out any pending queues, and then restoring the
594 * TTY line discipline to what it was before it got hooked to X.25
595 * (which usually is TTY again).
596 */
597 static void x25_asy_close_tty(struct tty_struct *tty)
598 {
599 struct x25_asy *sl = tty->disc_data;
600
601 /* First make sure we're connected. */
602 if (!sl || sl->magic != X25_ASY_MAGIC)
603 return;
604
605 rtnl_lock();
606 if (sl->dev->flags & IFF_UP)
607 dev_close(sl->dev);
608 rtnl_unlock();
609
610 tty->disc_data = NULL;
611 sl->tty = NULL;
612 x25_asy_free(sl);
613 }
614
615 /************************************************************************
616 * STANDARD X.25 ENCAPSULATION *
617 ************************************************************************/
618
619 static int x25_asy_esc(unsigned char *s, unsigned char *d, int len)
620 {
621 unsigned char *ptr = d;
622 unsigned char c;
623
624 /*
625 * Send an initial END character to flush out any
626 * data that may have accumulated in the receiver
627 * due to line noise.
628 */
629
630 *ptr++ = X25_END; /* Send 10111110 bit seq */
631
632 /*
633 * For each byte in the packet, send the appropriate
634 * character sequence, according to the X.25 protocol.
635 */
636
637 while (len-- > 0) {
638 switch (c = *s++) {
639 case X25_END:
640 *ptr++ = X25_ESC;
641 *ptr++ = X25_ESCAPE(X25_END);
642 break;
643 case X25_ESC:
644 *ptr++ = X25_ESC;
645 *ptr++ = X25_ESCAPE(X25_ESC);
646 break;
647 default:
648 *ptr++ = c;
649 break;
650 }
651 }
652 *ptr++ = X25_END;
653 return (ptr - d);
654 }
655
656 static void x25_asy_unesc(struct x25_asy *sl, unsigned char s)
657 {
658
659 switch (s) {
660 case X25_END:
661 if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
662 sl->rcount > 2)
663 x25_asy_bump(sl);
664 clear_bit(SLF_ESCAPE, &sl->flags);
665 sl->rcount = 0;
666 return;
667 case X25_ESC:
668 set_bit(SLF_ESCAPE, &sl->flags);
669 return;
670 case X25_ESCAPE(X25_ESC):
671 case X25_ESCAPE(X25_END):
672 if (test_and_clear_bit(SLF_ESCAPE, &sl->flags))
673 s = X25_UNESCAPE(s);
674 break;
675 }
676 if (!test_bit(SLF_ERROR, &sl->flags)) {
677 if (sl->rcount < sl->buffsize) {
678 sl->rbuff[sl->rcount++] = s;
679 return;
680 }
681 sl->dev->stats.rx_over_errors++;
682 set_bit(SLF_ERROR, &sl->flags);
683 }
684 }
685
686
687 /* Perform I/O control on an active X.25 channel. */
688 static int x25_asy_ioctl(struct tty_struct *tty, struct file *file,
689 unsigned int cmd, unsigned long arg)
690 {
691 struct x25_asy *sl = tty->disc_data;
692
693 /* First make sure we're connected. */
694 if (!sl || sl->magic != X25_ASY_MAGIC)
695 return -EINVAL;
696
697 switch (cmd) {
698 case SIOCGIFNAME:
699 if (copy_to_user((void __user *)arg, sl->dev->name,
700 strlen(sl->dev->name) + 1))
701 return -EFAULT;
702 return 0;
703 case SIOCSIFHWADDR:
704 return -EINVAL;
705 default:
706 return tty_mode_ioctl(tty, file, cmd, arg);
707 }
708 }
709
710 #ifdef CONFIG_COMPAT
711 static long x25_asy_compat_ioctl(struct tty_struct *tty, struct file *file,
712 unsigned int cmd, unsigned long arg)
713 {
714 switch (cmd) {
715 case SIOCGIFNAME:
716 case SIOCSIFHWADDR:
717 return x25_asy_ioctl(tty, file, cmd,
718 (unsigned long)compat_ptr(arg));
719 }
720
721 return -ENOIOCTLCMD;
722 }
723 #endif
724
725 static int x25_asy_open_dev(struct net_device *dev)
726 {
727 struct x25_asy *sl = netdev_priv(dev);
728 if (sl->tty == NULL)
729 return -ENODEV;
730 return 0;
731 }
732
733 static const struct net_device_ops x25_asy_netdev_ops = {
734 .ndo_open = x25_asy_open_dev,
735 .ndo_stop = x25_asy_close,
736 .ndo_start_xmit = x25_asy_xmit,
737 .ndo_tx_timeout = x25_asy_timeout,
738 .ndo_change_mtu = x25_asy_change_mtu,
739 };
740
741 /* Initialise the X.25 driver. Called by the device init code */
742 static void x25_asy_setup(struct net_device *dev)
743 {
744 struct x25_asy *sl = netdev_priv(dev);
745
746 sl->magic = X25_ASY_MAGIC;
747 sl->dev = dev;
748 spin_lock_init(&sl->lock);
749 set_bit(SLF_INUSE, &sl->flags);
750
751 /*
752 * Finish setting up the DEVICE info.
753 */
754
755 dev->mtu = SL_MTU;
756 dev->netdev_ops = &x25_asy_netdev_ops;
757 dev->watchdog_timeo = HZ*20;
758 dev->hard_header_len = 0;
759 dev->addr_len = 0;
760 dev->type = ARPHRD_X25;
761 dev->tx_queue_len = 10;
762
763 /* New-style flags. */
764 dev->flags = IFF_NOARP;
765 }
766
767 static struct tty_ldisc_ops x25_ldisc = {
768 .owner = THIS_MODULE,
769 .magic = TTY_LDISC_MAGIC,
770 .name = "X.25",
771 .open = x25_asy_open_tty,
772 .close = x25_asy_close_tty,
773 .ioctl = x25_asy_ioctl,
774 #ifdef CONFIG_COMPAT
775 .compat_ioctl = x25_asy_compat_ioctl,
776 #endif
777 .receive_buf = x25_asy_receive_buf,
778 .write_wakeup = x25_asy_write_wakeup,
779 };
780
781 static int __init init_x25_asy(void)
782 {
783 if (x25_asy_maxdev < 4)
784 x25_asy_maxdev = 4; /* Sanity */
785
786 printk(KERN_INFO "X.25 async: version 0.00 ALPHA "
787 "(dynamic channels, max=%d).\n", x25_asy_maxdev);
788
789 x25_asy_devs = kcalloc(x25_asy_maxdev, sizeof(struct net_device *),
790 GFP_KERNEL);
791 if (!x25_asy_devs) {
792 printk(KERN_WARNING "X25 async: Can't allocate x25_asy_ctrls[] "
793 "array! Uaargh! (-> No X.25 available)\n");
794 return -ENOMEM;
795 }
796
797 return tty_register_ldisc(N_X25, &x25_ldisc);
798 }
799
800
801 static void __exit exit_x25_asy(void)
802 {
803 struct net_device *dev;
804 int i;
805
806 for (i = 0; i < x25_asy_maxdev; i++) {
807 dev = x25_asy_devs[i];
808 if (dev) {
809 struct x25_asy *sl = netdev_priv(dev);
810
811 spin_lock_bh(&sl->lock);
812 if (sl->tty)
813 tty_hangup(sl->tty);
814
815 spin_unlock_bh(&sl->lock);
816 /*
817 * VSV = if dev->start==0, then device
818 * unregistered while close proc.
819 */
820 unregister_netdev(dev);
821 free_netdev(dev);
822 }
823 }
824
825 kfree(x25_asy_devs);
826 tty_unregister_ldisc(N_X25);
827 }
828
829 module_init(init_x25_asy);
830 module_exit(exit_x25_asy);
Linux with added FPC-III support