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authorJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-03 06:17:13 -0400
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-27 03:58:36 -0400
commitb5451d783ade99308dfccdf5ca284ed07affa4ff (patch)
tree98830cee17e38f3351bb3f1cc839ee3c29ec68a3 /drivers/net/slip.c
parent18e635f4b3e1e1b43cb239321f6120918ba38d46 (diff)
slip: Move the SLIP drivers
Move the Serial Line Internet Protocol (SLIP) drivers into drivers/net/slip/ and make the necessary Kconfig and Makefile changes. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Acked-by: Alan Cox <alan@linux.intel.com>
Diffstat (limited to 'drivers/net/slip.c')
-rw-r--r--drivers/net/slip.c1444
1 files changed, 0 insertions, 1444 deletions
diff --git a/drivers/net/slip.c b/drivers/net/slip.c
deleted file mode 100644
index ba08341fb92c..000000000000
--- a/drivers/net/slip.c
+++ /dev/null
@@ -1,1444 +0,0 @@
1/*
2 * slip.c This module implements the SLIP protocol for kernel-based
3 * devices like TTY. It interfaces between a raw TTY, and the
4 * kernel's INET protocol layers.
5 *
6 * Version: @(#)slip.c 0.8.3 12/24/94
7 *
8 * Authors: Laurence Culhane, <loz@holmes.demon.co.uk>
9 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
10 *
11 * Fixes:
12 * Alan Cox : Sanity checks and avoid tx overruns.
13 * Has a new sl->mtu field.
14 * Alan Cox : Found cause of overrun. ifconfig sl0
15 * mtu upwards. Driver now spots this
16 * and grows/shrinks its buffers(hack!).
17 * Memory leak if you run out of memory
18 * setting up a slip driver fixed.
19 * Matt Dillon : Printable slip (borrowed from NET2E)
20 * Pauline Middelink : Slip driver fixes.
21 * Alan Cox : Honours the old SL_COMPRESSED flag
22 * Alan Cox : KISS AX.25 and AXUI IP support
23 * Michael Riepe : Automatic CSLIP recognition added
24 * Charles Hedrick : CSLIP header length problem fix.
25 * Alan Cox : Corrected non-IP cases of the above.
26 * Alan Cox : Now uses hardware type as per FvK.
27 * Alan Cox : Default to 192.168.0.0 (RFC 1597)
28 * A.N.Kuznetsov : dev_tint() recursion fix.
29 * Dmitry Gorodchanin : SLIP memory leaks
30 * Dmitry Gorodchanin : Code cleanup. Reduce tty driver
31 * buffering from 4096 to 256 bytes.
32 * Improving SLIP response time.
33 * CONFIG_SLIP_MODE_SLIP6.
34 * ifconfig sl? up & down now works
35 * correctly.
36 * Modularization.
37 * Alan Cox : Oops - fix AX.25 buffer lengths
38 * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP
39 * statistics. Include CSLIP code only
40 * if it really needed.
41 * Alan Cox : Free slhc buffers in the right place.
42 * Alan Cox : Allow for digipeated IP over AX.25
43 * Matti Aarnio : Dynamic SLIP devices, with ideas taken
44 * from Jim Freeman's <jfree@caldera.com>
45 * dynamic PPP devices. We do NOT kfree()
46 * device entries, just reg./unreg. them
47 * as they are needed. We kfree() them
48 * at module cleanup.
49 * With MODULE-loading ``insmod'', user
50 * can issue parameter: slip_maxdev=1024
51 * (Or how much he/she wants.. Default
52 * is 256)
53 * Stanislav Voronyi : Slip line checking, with ideas taken
54 * from multislip BSDI driver which was
55 * written by Igor Chechik, RELCOM Corp.
56 * Only algorithms have been ported to
57 * Linux SLIP driver.
58 * Vitaly E. Lavrov : Sane behaviour on tty hangup.
59 * Alexey Kuznetsov : Cleanup interfaces to tty & netdevice
60 * modules.
61 */
62
63#define SL_CHECK_TRANSMIT
64#include <linux/module.h>
65#include <linux/moduleparam.h>
66
67#include <asm/system.h>
68#include <asm/uaccess.h>
69#include <linux/bitops.h>
70#include <linux/sched.h>
71#include <linux/string.h>
72#include <linux/mm.h>
73#include <linux/interrupt.h>
74#include <linux/in.h>
75#include <linux/tty.h>
76#include <linux/errno.h>
77#include <linux/netdevice.h>
78#include <linux/etherdevice.h>
79#include <linux/skbuff.h>
80#include <linux/rtnetlink.h>
81#include <linux/if_arp.h>
82#include <linux/if_slip.h>
83#include <linux/compat.h>
84#include <linux/delay.h>
85#include <linux/init.h>
86#include <linux/slab.h>
87#include "slip.h"
88#ifdef CONFIG_INET
89#include <linux/ip.h>
90#include <linux/tcp.h>
91#include <net/slhc_vj.h>
92#endif
93
94#define SLIP_VERSION "0.8.4-NET3.019-NEWTTY"
95
96static struct net_device **slip_devs;
97
98static int slip_maxdev = SL_NRUNIT;
99module_param(slip_maxdev, int, 0);
100MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices");
101
102static int slip_esc(unsigned char *p, unsigned char *d, int len);
103static void slip_unesc(struct slip *sl, unsigned char c);
104#ifdef CONFIG_SLIP_MODE_SLIP6
105static int slip_esc6(unsigned char *p, unsigned char *d, int len);
106static void slip_unesc6(struct slip *sl, unsigned char c);
107#endif
108#ifdef CONFIG_SLIP_SMART
109static void sl_keepalive(unsigned long sls);
110static void sl_outfill(unsigned long sls);
111static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
112#endif
113
114/********************************
115* Buffer administration routines:
116* sl_alloc_bufs()
117* sl_free_bufs()
118* sl_realloc_bufs()
119*
120* NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because
121* sl_realloc_bufs provides strong atomicity and reallocation
122* on actively running device.
123*********************************/
124
125/*
126 Allocate channel buffers.
127 */
128
129static int sl_alloc_bufs(struct slip *sl, int mtu)
130{
131 int err = -ENOBUFS;
132 unsigned long len;
133 char *rbuff = NULL;
134 char *xbuff = NULL;
135#ifdef SL_INCLUDE_CSLIP
136 char *cbuff = NULL;
137 struct slcompress *slcomp = NULL;
138#endif
139
140 /*
141 * Allocate the SLIP frame buffers:
142 *
143 * rbuff Receive buffer.
144 * xbuff Transmit buffer.
145 * cbuff Temporary compression buffer.
146 */
147 len = mtu * 2;
148
149 /*
150 * allow for arrival of larger UDP packets, even if we say not to
151 * also fixes a bug in which SunOS sends 512-byte packets even with
152 * an MSS of 128
153 */
154 if (len < 576 * 2)
155 len = 576 * 2;
156 rbuff = kmalloc(len + 4, GFP_KERNEL);
157 if (rbuff == NULL)
158 goto err_exit;
159 xbuff = kmalloc(len + 4, GFP_KERNEL);
160 if (xbuff == NULL)
161 goto err_exit;
162#ifdef SL_INCLUDE_CSLIP
163 cbuff = kmalloc(len + 4, GFP_KERNEL);
164 if (cbuff == NULL)
165 goto err_exit;
166 slcomp = slhc_init(16, 16);
167 if (slcomp == NULL)
168 goto err_exit;
169#endif
170 spin_lock_bh(&sl->lock);
171 if (sl->tty == NULL) {
172 spin_unlock_bh(&sl->lock);
173 err = -ENODEV;
174 goto err_exit;
175 }
176 sl->mtu = mtu;
177 sl->buffsize = len;
178 sl->rcount = 0;
179 sl->xleft = 0;
180 rbuff = xchg(&sl->rbuff, rbuff);
181 xbuff = xchg(&sl->xbuff, xbuff);
182#ifdef SL_INCLUDE_CSLIP
183 cbuff = xchg(&sl->cbuff, cbuff);
184 slcomp = xchg(&sl->slcomp, slcomp);
185#endif
186#ifdef CONFIG_SLIP_MODE_SLIP6
187 sl->xdata = 0;
188 sl->xbits = 0;
189#endif
190 spin_unlock_bh(&sl->lock);
191 err = 0;
192
193 /* Cleanup */
194err_exit:
195#ifdef SL_INCLUDE_CSLIP
196 kfree(cbuff);
197 slhc_free(slcomp);
198#endif
199 kfree(xbuff);
200 kfree(rbuff);
201 return err;
202}
203
204/* Free a SLIP channel buffers. */
205static void sl_free_bufs(struct slip *sl)
206{
207 /* Free all SLIP frame buffers. */
208 kfree(xchg(&sl->rbuff, NULL));
209 kfree(xchg(&sl->xbuff, NULL));
210#ifdef SL_INCLUDE_CSLIP
211 kfree(xchg(&sl->cbuff, NULL));
212 slhc_free(xchg(&sl->slcomp, NULL));
213#endif
214}
215
216/*
217 Reallocate slip channel buffers.
218 */
219
220static int sl_realloc_bufs(struct slip *sl, int mtu)
221{
222 int err = 0;
223 struct net_device *dev = sl->dev;
224 unsigned char *xbuff, *rbuff;
225#ifdef SL_INCLUDE_CSLIP
226 unsigned char *cbuff;
227#endif
228 int len = mtu * 2;
229
230/*
231 * allow for arrival of larger UDP packets, even if we say not to
232 * also fixes a bug in which SunOS sends 512-byte packets even with
233 * an MSS of 128
234 */
235 if (len < 576 * 2)
236 len = 576 * 2;
237
238 xbuff = kmalloc(len + 4, GFP_ATOMIC);
239 rbuff = kmalloc(len + 4, GFP_ATOMIC);
240#ifdef SL_INCLUDE_CSLIP
241 cbuff = kmalloc(len + 4, GFP_ATOMIC);
242#endif
243
244
245#ifdef SL_INCLUDE_CSLIP
246 if (xbuff == NULL || rbuff == NULL || cbuff == NULL) {
247#else
248 if (xbuff == NULL || rbuff == NULL) {
249#endif
250 if (mtu > sl->mtu) {
251 printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n",
252 dev->name);
253 err = -ENOBUFS;
254 }
255 goto done;
256 }
257 spin_lock_bh(&sl->lock);
258
259 err = -ENODEV;
260 if (sl->tty == NULL)
261 goto done_on_bh;
262
263 xbuff = xchg(&sl->xbuff, xbuff);
264 rbuff = xchg(&sl->rbuff, rbuff);
265#ifdef SL_INCLUDE_CSLIP
266 cbuff = xchg(&sl->cbuff, cbuff);
267#endif
268 if (sl->xleft) {
269 if (sl->xleft <= len) {
270 memcpy(sl->xbuff, sl->xhead, sl->xleft);
271 } else {
272 sl->xleft = 0;
273 dev->stats.tx_dropped++;
274 }
275 }
276 sl->xhead = sl->xbuff;
277
278 if (sl->rcount) {
279 if (sl->rcount <= len) {
280 memcpy(sl->rbuff, rbuff, sl->rcount);
281 } else {
282 sl->rcount = 0;
283 dev->stats.rx_over_errors++;
284 set_bit(SLF_ERROR, &sl->flags);
285 }
286 }
287 sl->mtu = mtu;
288 dev->mtu = mtu;
289 sl->buffsize = len;
290 err = 0;
291
292done_on_bh:
293 spin_unlock_bh(&sl->lock);
294
295done:
296 kfree(xbuff);
297 kfree(rbuff);
298#ifdef SL_INCLUDE_CSLIP
299 kfree(cbuff);
300#endif
301 return err;
302}
303
304
305/* Set the "sending" flag. This must be atomic hence the set_bit. */
306static inline void sl_lock(struct slip *sl)
307{
308 netif_stop_queue(sl->dev);
309}
310
311
312/* Clear the "sending" flag. This must be atomic, hence the ASM. */
313static inline void sl_unlock(struct slip *sl)
314{
315 netif_wake_queue(sl->dev);
316}
317
318/* Send one completely decapsulated IP datagram to the IP layer. */
319static void sl_bump(struct slip *sl)
320{
321 struct net_device *dev = sl->dev;
322 struct sk_buff *skb;
323 int count;
324
325 count = sl->rcount;
326#ifdef SL_INCLUDE_CSLIP
327 if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) {
328 unsigned char c = sl->rbuff[0];
329 if (c & SL_TYPE_COMPRESSED_TCP) {
330 /* ignore compressed packets when CSLIP is off */
331 if (!(sl->mode & SL_MODE_CSLIP)) {
332 printk(KERN_WARNING "%s: compressed packet ignored\n", dev->name);
333 return;
334 }
335 /* make sure we've reserved enough space for uncompress
336 to use */
337 if (count + 80 > sl->buffsize) {
338 dev->stats.rx_over_errors++;
339 return;
340 }
341 count = slhc_uncompress(sl->slcomp, sl->rbuff, count);
342 if (count <= 0)
343 return;
344 } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) {
345 if (!(sl->mode & SL_MODE_CSLIP)) {
346 /* turn on header compression */
347 sl->mode |= SL_MODE_CSLIP;
348 sl->mode &= ~SL_MODE_ADAPTIVE;
349 printk(KERN_INFO "%s: header compression turned on\n", dev->name);
350 }
351 sl->rbuff[0] &= 0x4f;
352 if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0)
353 return;
354 }
355 }
356#endif /* SL_INCLUDE_CSLIP */
357
358 dev->stats.rx_bytes += count;
359
360 skb = dev_alloc_skb(count);
361 if (skb == NULL) {
362 printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
363 dev->stats.rx_dropped++;
364 return;
365 }
366 skb->dev = dev;
367 memcpy(skb_put(skb, count), sl->rbuff, count);
368 skb_reset_mac_header(skb);
369 skb->protocol = htons(ETH_P_IP);
370 netif_rx_ni(skb);
371 dev->stats.rx_packets++;
372}
373
374/* Encapsulate one IP datagram and stuff into a TTY queue. */
375static void sl_encaps(struct slip *sl, unsigned char *icp, int len)
376{
377 unsigned char *p;
378 int actual, count;
379
380 if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */
381 printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name);
382 sl->dev->stats.tx_dropped++;
383 sl_unlock(sl);
384 return;
385 }
386
387 p = icp;
388#ifdef SL_INCLUDE_CSLIP
389 if (sl->mode & SL_MODE_CSLIP)
390 len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1);
391#endif
392#ifdef CONFIG_SLIP_MODE_SLIP6
393 if (sl->mode & SL_MODE_SLIP6)
394 count = slip_esc6(p, (unsigned char *) sl->xbuff, len);
395 else
396#endif
397 count = slip_esc(p, (unsigned char *) sl->xbuff, len);
398
399 /* Order of next two lines is *very* important.
400 * When we are sending a little amount of data,
401 * the transfer may be completed inside the ops->write()
402 * routine, because it's running with interrupts enabled.
403 * In this case we *never* got WRITE_WAKEUP event,
404 * if we did not request it before write operation.
405 * 14 Oct 1994 Dmitry Gorodchanin.
406 */
407 set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
408 actual = sl->tty->ops->write(sl->tty, sl->xbuff, count);
409#ifdef SL_CHECK_TRANSMIT
410 sl->dev->trans_start = jiffies;
411#endif
412 sl->xleft = count - actual;
413 sl->xhead = sl->xbuff + actual;
414#ifdef CONFIG_SLIP_SMART
415 /* VSV */
416 clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */
417#endif
418}
419
420/*
421 * Called by the driver when there's room for more data. If we have
422 * more packets to send, we send them here.
423 */
424static void slip_write_wakeup(struct tty_struct *tty)
425{
426 int actual;
427 struct slip *sl = tty->disc_data;
428
429 /* First make sure we're connected. */
430 if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev))
431 return;
432
433 if (sl->xleft <= 0) {
434 /* Now serial buffer is almost free & we can start
435 * transmission of another packet */
436 sl->dev->stats.tx_packets++;
437 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
438 sl_unlock(sl);
439 return;
440 }
441
442 actual = tty->ops->write(tty, sl->xhead, sl->xleft);
443 sl->xleft -= actual;
444 sl->xhead += actual;
445}
446
447static void sl_tx_timeout(struct net_device *dev)
448{
449 struct slip *sl = netdev_priv(dev);
450
451 spin_lock(&sl->lock);
452
453 if (netif_queue_stopped(dev)) {
454 if (!netif_running(dev))
455 goto out;
456
457 /* May be we must check transmitter timeout here ?
458 * 14 Oct 1994 Dmitry Gorodchanin.
459 */
460#ifdef SL_CHECK_TRANSMIT
461 if (time_before(jiffies, dev_trans_start(dev) + 20 * HZ)) {
462 /* 20 sec timeout not reached */
463 goto out;
464 }
465 printk(KERN_WARNING "%s: transmit timed out, %s?\n",
466 dev->name,
467 (tty_chars_in_buffer(sl->tty) || sl->xleft) ?
468 "bad line quality" : "driver error");
469 sl->xleft = 0;
470 clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
471 sl_unlock(sl);
472#endif
473 }
474out:
475 spin_unlock(&sl->lock);
476}
477
478
479/* Encapsulate an IP datagram and kick it into a TTY queue. */
480static netdev_tx_t
481sl_xmit(struct sk_buff *skb, struct net_device *dev)
482{
483 struct slip *sl = netdev_priv(dev);
484
485 spin_lock(&sl->lock);
486 if (!netif_running(dev)) {
487 spin_unlock(&sl->lock);
488 printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name);
489 dev_kfree_skb(skb);
490 return NETDEV_TX_OK;
491 }
492 if (sl->tty == NULL) {
493 spin_unlock(&sl->lock);
494 dev_kfree_skb(skb);
495 return NETDEV_TX_OK;
496 }
497
498 sl_lock(sl);
499 dev->stats.tx_bytes += skb->len;
500 sl_encaps(sl, skb->data, skb->len);
501 spin_unlock(&sl->lock);
502
503 dev_kfree_skb(skb);
504 return NETDEV_TX_OK;
505}
506
507
508/******************************************
509 * Routines looking at netdevice side.
510 ******************************************/
511
512/* Netdevice UP -> DOWN routine */
513
514static int
515sl_close(struct net_device *dev)
516{
517 struct slip *sl = netdev_priv(dev);
518
519 spin_lock_bh(&sl->lock);
520 if (sl->tty)
521 /* TTY discipline is running. */
522 clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
523 netif_stop_queue(dev);
524 sl->rcount = 0;
525 sl->xleft = 0;
526 spin_unlock_bh(&sl->lock);
527
528 return 0;
529}
530
531/* Netdevice DOWN -> UP routine */
532
533static int sl_open(struct net_device *dev)
534{
535 struct slip *sl = netdev_priv(dev);
536
537 if (sl->tty == NULL)
538 return -ENODEV;
539
540 sl->flags &= (1 << SLF_INUSE);
541 netif_start_queue(dev);
542 return 0;
543}
544
545/* Netdevice change MTU request */
546
547static int sl_change_mtu(struct net_device *dev, int new_mtu)
548{
549 struct slip *sl = netdev_priv(dev);
550
551 if (new_mtu < 68 || new_mtu > 65534)
552 return -EINVAL;
553
554 if (new_mtu != dev->mtu)
555 return sl_realloc_bufs(sl, new_mtu);
556 return 0;
557}
558
559/* Netdevice get statistics request */
560
561static struct rtnl_link_stats64 *
562sl_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
563{
564 struct net_device_stats *devstats = &dev->stats;
565#ifdef SL_INCLUDE_CSLIP
566 struct slip *sl = netdev_priv(dev);
567 struct slcompress *comp = sl->slcomp;
568#endif
569 stats->rx_packets = devstats->rx_packets;
570 stats->tx_packets = devstats->tx_packets;
571 stats->rx_bytes = devstats->rx_bytes;
572 stats->tx_bytes = devstats->tx_bytes;
573 stats->rx_dropped = devstats->rx_dropped;
574 stats->tx_dropped = devstats->tx_dropped;
575 stats->tx_errors = devstats->tx_errors;
576 stats->rx_errors = devstats->rx_errors;
577 stats->rx_over_errors = devstats->rx_over_errors;
578
579#ifdef SL_INCLUDE_CSLIP
580 if (comp) {
581 /* Generic compressed statistics */
582 stats->rx_compressed = comp->sls_i_compressed;
583 stats->tx_compressed = comp->sls_o_compressed;
584
585 /* Are we really still needs this? */
586 stats->rx_fifo_errors += comp->sls_i_compressed;
587 stats->rx_dropped += comp->sls_i_tossed;
588 stats->tx_fifo_errors += comp->sls_o_compressed;
589 stats->collisions += comp->sls_o_misses;
590 }
591#endif
592 return stats;
593}
594
595/* Netdevice register callback */
596
597static int sl_init(struct net_device *dev)
598{
599 struct slip *sl = netdev_priv(dev);
600
601 /*
602 * Finish setting up the DEVICE info.
603 */
604
605 dev->mtu = sl->mtu;
606 dev->type = ARPHRD_SLIP + sl->mode;
607#ifdef SL_CHECK_TRANSMIT
608 dev->watchdog_timeo = 20*HZ;
609#endif
610 return 0;
611}
612
613
614static void sl_uninit(struct net_device *dev)
615{
616 struct slip *sl = netdev_priv(dev);
617
618 sl_free_bufs(sl);
619}
620
621/* Hook the destructor so we can free slip devices at the right point in time */
622static void sl_free_netdev(struct net_device *dev)
623{
624 int i = dev->base_addr;
625 free_netdev(dev);
626 slip_devs[i] = NULL;
627}
628
629static const struct net_device_ops sl_netdev_ops = {
630 .ndo_init = sl_init,
631 .ndo_uninit = sl_uninit,
632 .ndo_open = sl_open,
633 .ndo_stop = sl_close,
634 .ndo_start_xmit = sl_xmit,
635 .ndo_get_stats64 = sl_get_stats64,
636 .ndo_change_mtu = sl_change_mtu,
637 .ndo_tx_timeout = sl_tx_timeout,
638#ifdef CONFIG_SLIP_SMART
639 .ndo_do_ioctl = sl_ioctl,
640#endif
641};
642
643
644static void sl_setup(struct net_device *dev)
645{
646 dev->netdev_ops = &sl_netdev_ops;
647 dev->destructor = sl_free_netdev;
648
649 dev->hard_header_len = 0;
650 dev->addr_len = 0;
651 dev->tx_queue_len = 10;
652
653 /* New-style flags. */
654 dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST;
655}
656
657/******************************************
658 Routines looking at TTY side.
659 ******************************************/
660
661
662/*
663 * Handle the 'receiver data ready' interrupt.
664 * This function is called by the 'tty_io' module in the kernel when
665 * a block of SLIP data has been received, which can now be decapsulated
666 * and sent on to some IP layer for further processing. This will not
667 * be re-entered while running but other ldisc functions may be called
668 * in parallel
669 */
670
671static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
672 char *fp, int count)
673{
674 struct slip *sl = tty->disc_data;
675
676 if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev))
677 return;
678
679 /* Read the characters out of the buffer */
680 while (count--) {
681 if (fp && *fp++) {
682 if (!test_and_set_bit(SLF_ERROR, &sl->flags))
683 sl->dev->stats.rx_errors++;
684 cp++;
685 continue;
686 }
687#ifdef CONFIG_SLIP_MODE_SLIP6
688 if (sl->mode & SL_MODE_SLIP6)
689 slip_unesc6(sl, *cp++);
690 else
691#endif
692 slip_unesc(sl, *cp++);
693 }
694}
695
696/************************************
697 * slip_open helper routines.
698 ************************************/
699
700/* Collect hanged up channels */
701static void sl_sync(void)
702{
703 int i;
704 struct net_device *dev;
705 struct slip *sl;
706
707 for (i = 0; i < slip_maxdev; i++) {
708 dev = slip_devs[i];
709 if (dev == NULL)
710 break;
711
712 sl = netdev_priv(dev);
713 if (sl->tty || sl->leased)
714 continue;
715 if (dev->flags & IFF_UP)
716 dev_close(dev);
717 }
718}
719
720
721/* Find a free SLIP channel, and link in this `tty' line. */
722static struct slip *sl_alloc(dev_t line)
723{
724 int i;
725 char name[IFNAMSIZ];
726 struct net_device *dev = NULL;
727 struct slip *sl;
728
729 for (i = 0; i < slip_maxdev; i++) {
730 dev = slip_devs[i];
731 if (dev == NULL)
732 break;
733 }
734 /* Sorry, too many, all slots in use */
735 if (i >= slip_maxdev)
736 return NULL;
737
738 sprintf(name, "sl%d", i);
739 dev = alloc_netdev(sizeof(*sl), name, sl_setup);
740 if (!dev)
741 return NULL;
742
743 dev->base_addr = i;
744 sl = netdev_priv(dev);
745
746 /* Initialize channel control data */
747 sl->magic = SLIP_MAGIC;
748 sl->dev = dev;
749 spin_lock_init(&sl->lock);
750 sl->mode = SL_MODE_DEFAULT;
751#ifdef CONFIG_SLIP_SMART
752 /* initialize timer_list struct */
753 init_timer(&sl->keepalive_timer);
754 sl->keepalive_timer.data = (unsigned long)sl;
755 sl->keepalive_timer.function = sl_keepalive;
756 init_timer(&sl->outfill_timer);
757 sl->outfill_timer.data = (unsigned long)sl;
758 sl->outfill_timer.function = sl_outfill;
759#endif
760 slip_devs[i] = dev;
761 return sl;
762}
763
764/*
765 * Open the high-level part of the SLIP channel.
766 * This function is called by the TTY module when the
767 * SLIP line discipline is called for. Because we are
768 * sure the tty line exists, we only have to link it to
769 * a free SLIP channel...
770 *
771 * Called in process context serialized from other ldisc calls.
772 */
773
774static int slip_open(struct tty_struct *tty)
775{
776 struct slip *sl;
777 int err;
778
779 if (!capable(CAP_NET_ADMIN))
780 return -EPERM;
781
782 if (tty->ops->write == NULL)
783 return -EOPNOTSUPP;
784
785 /* RTnetlink lock is misused here to serialize concurrent
786 opens of slip channels. There are better ways, but it is
787 the simplest one.
788 */
789 rtnl_lock();
790
791 /* Collect hanged up channels. */
792 sl_sync();
793
794 sl = tty->disc_data;
795
796 err = -EEXIST;
797 /* First make sure we're not already connected. */
798 if (sl && sl->magic == SLIP_MAGIC)
799 goto err_exit;
800
801 /* OK. Find a free SLIP channel to use. */
802 err = -ENFILE;
803 sl = sl_alloc(tty_devnum(tty));
804 if (sl == NULL)
805 goto err_exit;
806
807 sl->tty = tty;
808 tty->disc_data = sl;
809 sl->pid = current->pid;
810
811 if (!test_bit(SLF_INUSE, &sl->flags)) {
812 /* Perform the low-level SLIP initialization. */
813 err = sl_alloc_bufs(sl, SL_MTU);
814 if (err)
815 goto err_free_chan;
816
817 set_bit(SLF_INUSE, &sl->flags);
818
819 err = register_netdevice(sl->dev);
820 if (err)
821 goto err_free_bufs;
822 }
823
824#ifdef CONFIG_SLIP_SMART
825 if (sl->keepalive) {
826 sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ;
827 add_timer(&sl->keepalive_timer);
828 }
829 if (sl->outfill) {
830 sl->outfill_timer.expires = jiffies + sl->outfill * HZ;
831 add_timer(&sl->outfill_timer);
832 }
833#endif
834
835 /* Done. We have linked the TTY line to a channel. */
836 rtnl_unlock();
837 tty->receive_room = 65536; /* We don't flow control */
838
839 /* TTY layer expects 0 on success */
840 return 0;
841
842err_free_bufs:
843 sl_free_bufs(sl);
844
845err_free_chan:
846 sl->tty = NULL;
847 tty->disc_data = NULL;
848 clear_bit(SLF_INUSE, &sl->flags);
849
850err_exit:
851 rtnl_unlock();
852
853 /* Count references from TTY module */
854 return err;
855}
856
857/*
858 * Close down a SLIP channel.
859 * This means flushing out any pending queues, and then returning. This
860 * call is serialized against other ldisc functions.
861 *
862 * We also use this method fo a hangup event
863 */
864
865static void slip_close(struct tty_struct *tty)
866{
867 struct slip *sl = tty->disc_data;
868
869 /* First make sure we're connected. */
870 if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty)
871 return;
872
873 tty->disc_data = NULL;
874 sl->tty = NULL;
875
876 /* VSV = very important to remove timers */
877#ifdef CONFIG_SLIP_SMART
878 del_timer_sync(&sl->keepalive_timer);
879 del_timer_sync(&sl->outfill_timer);
880#endif
881 /* Flush network side */
882 unregister_netdev(sl->dev);
883 /* This will complete via sl_free_netdev */
884}
885
886static int slip_hangup(struct tty_struct *tty)
887{
888 slip_close(tty);
889 return 0;
890}
891 /************************************************************************
892 * STANDARD SLIP ENCAPSULATION *
893 ************************************************************************/
894
895static int slip_esc(unsigned char *s, unsigned char *d, int len)
896{
897 unsigned char *ptr = d;
898 unsigned char c;
899
900 /*
901 * Send an initial END character to flush out any
902 * data that may have accumulated in the receiver
903 * due to line noise.
904 */
905
906 *ptr++ = END;
907
908 /*
909 * For each byte in the packet, send the appropriate
910 * character sequence, according to the SLIP protocol.
911 */
912
913 while (len-- > 0) {
914 switch (c = *s++) {
915 case END:
916 *ptr++ = ESC;
917 *ptr++ = ESC_END;
918 break;
919 case ESC:
920 *ptr++ = ESC;
921 *ptr++ = ESC_ESC;
922 break;
923 default:
924 *ptr++ = c;
925 break;
926 }
927 }
928 *ptr++ = END;
929 return ptr - d;
930}
931
932static void slip_unesc(struct slip *sl, unsigned char s)
933{
934
935 switch (s) {
936 case END:
937#ifdef CONFIG_SLIP_SMART
938 /* drop keeptest bit = VSV */
939 if (test_bit(SLF_KEEPTEST, &sl->flags))
940 clear_bit(SLF_KEEPTEST, &sl->flags);
941#endif
942
943 if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
944 (sl->rcount > 2))
945 sl_bump(sl);
946 clear_bit(SLF_ESCAPE, &sl->flags);
947 sl->rcount = 0;
948 return;
949
950 case ESC:
951 set_bit(SLF_ESCAPE, &sl->flags);
952 return;
953 case ESC_ESC:
954 if (test_and_clear_bit(SLF_ESCAPE, &sl->flags))
955 s = ESC;
956 break;
957 case ESC_END:
958 if (test_and_clear_bit(SLF_ESCAPE, &sl->flags))
959 s = END;
960 break;
961 }
962 if (!test_bit(SLF_ERROR, &sl->flags)) {
963 if (sl->rcount < sl->buffsize) {
964 sl->rbuff[sl->rcount++] = s;
965 return;
966 }
967 sl->dev->stats.rx_over_errors++;
968 set_bit(SLF_ERROR, &sl->flags);
969 }
970}
971
972
973#ifdef CONFIG_SLIP_MODE_SLIP6
974/************************************************************************
975 * 6 BIT SLIP ENCAPSULATION *
976 ************************************************************************/
977
978static int slip_esc6(unsigned char *s, unsigned char *d, int len)
979{
980 unsigned char *ptr = d;
981 unsigned char c;
982 int i;
983 unsigned short v = 0;
984 short bits = 0;
985
986 /*
987 * Send an initial END character to flush out any
988 * data that may have accumulated in the receiver
989 * due to line noise.
990 */
991
992 *ptr++ = 0x70;
993
994 /*
995 * Encode the packet into printable ascii characters
996 */
997
998 for (i = 0; i < len; ++i) {
999 v = (v << 8) | s[i];
1000 bits += 8;
1001 while (bits >= 6) {
1002 bits -= 6;
1003 c = 0x30 + ((v >> bits) & 0x3F);
1004 *ptr++ = c;
1005 }
1006 }
1007 if (bits) {
1008 c = 0x30 + ((v << (6 - bits)) & 0x3F);
1009 *ptr++ = c;
1010 }
1011 *ptr++ = 0x70;
1012 return ptr - d;
1013}
1014
1015static void slip_unesc6(struct slip *sl, unsigned char s)
1016{
1017 unsigned char c;
1018
1019 if (s == 0x70) {
1020#ifdef CONFIG_SLIP_SMART
1021 /* drop keeptest bit = VSV */
1022 if (test_bit(SLF_KEEPTEST, &sl->flags))
1023 clear_bit(SLF_KEEPTEST, &sl->flags);
1024#endif
1025
1026 if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
1027 (sl->rcount > 2))
1028 sl_bump(sl);
1029 sl->rcount = 0;
1030 sl->xbits = 0;
1031 sl->xdata = 0;
1032 } else if (s >= 0x30 && s < 0x70) {
1033 sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F);
1034 sl->xbits += 6;
1035 if (sl->xbits >= 8) {
1036 sl->xbits -= 8;
1037 c = (unsigned char)(sl->xdata >> sl->xbits);
1038 if (!test_bit(SLF_ERROR, &sl->flags)) {
1039 if (sl->rcount < sl->buffsize) {
1040 sl->rbuff[sl->rcount++] = c;
1041 return;
1042 }
1043 sl->dev->stats.rx_over_errors++;
1044 set_bit(SLF_ERROR, &sl->flags);
1045 }
1046 }
1047 }
1048}
1049#endif /* CONFIG_SLIP_MODE_SLIP6 */
1050
1051/* Perform I/O control on an active SLIP channel. */
1052static int slip_ioctl(struct tty_struct *tty, struct file *file,
1053 unsigned int cmd, unsigned long arg)
1054{
1055 struct slip *sl = tty->disc_data;
1056 unsigned int tmp;
1057 int __user *p = (int __user *)arg;
1058
1059 /* First make sure we're connected. */
1060 if (!sl || sl->magic != SLIP_MAGIC)
1061 return -EINVAL;
1062
1063 switch (cmd) {
1064 case SIOCGIFNAME:
1065 tmp = strlen(sl->dev->name) + 1;
1066 if (copy_to_user((void __user *)arg, sl->dev->name, tmp))
1067 return -EFAULT;
1068 return 0;
1069
1070 case SIOCGIFENCAP:
1071 if (put_user(sl->mode, p))
1072 return -EFAULT;
1073 return 0;
1074
1075 case SIOCSIFENCAP:
1076 if (get_user(tmp, p))
1077 return -EFAULT;
1078#ifndef SL_INCLUDE_CSLIP
1079 if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE))
1080 return -EINVAL;
1081#else
1082 if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) ==
1083 (SL_MODE_ADAPTIVE | SL_MODE_CSLIP))
1084 /* return -EINVAL; */
1085 tmp &= ~SL_MODE_ADAPTIVE;
1086#endif
1087#ifndef CONFIG_SLIP_MODE_SLIP6
1088 if (tmp & SL_MODE_SLIP6)
1089 return -EINVAL;
1090#endif
1091 sl->mode = tmp;
1092 sl->dev->type = ARPHRD_SLIP + sl->mode;
1093 return 0;
1094
1095 case SIOCSIFHWADDR:
1096 return -EINVAL;
1097
1098#ifdef CONFIG_SLIP_SMART
1099 /* VSV changes start here */
1100 case SIOCSKEEPALIVE:
1101 if (get_user(tmp, p))
1102 return -EFAULT;
1103 if (tmp > 255) /* max for unchar */
1104 return -EINVAL;
1105
1106 spin_lock_bh(&sl->lock);
1107 if (!sl->tty) {
1108 spin_unlock_bh(&sl->lock);
1109 return -ENODEV;
1110 }
1111 sl->keepalive = (u8)tmp;
1112 if (sl->keepalive != 0) {
1113 mod_timer(&sl->keepalive_timer,
1114 jiffies + sl->keepalive * HZ);
1115 set_bit(SLF_KEEPTEST, &sl->flags);
1116 } else
1117 del_timer(&sl->keepalive_timer);
1118 spin_unlock_bh(&sl->lock);
1119 return 0;
1120
1121 case SIOCGKEEPALIVE:
1122 if (put_user(sl->keepalive, p))
1123 return -EFAULT;
1124 return 0;
1125
1126 case SIOCSOUTFILL:
1127 if (get_user(tmp, p))
1128 return -EFAULT;
1129 if (tmp > 255) /* max for unchar */
1130 return -EINVAL;
1131 spin_lock_bh(&sl->lock);
1132 if (!sl->tty) {
1133 spin_unlock_bh(&sl->lock);
1134 return -ENODEV;
1135 }
1136 sl->outfill = (u8)tmp;
1137 if (sl->outfill != 0) {
1138 mod_timer(&sl->outfill_timer,
1139 jiffies + sl->outfill * HZ);
1140 set_bit(SLF_OUTWAIT, &sl->flags);
1141 } else
1142 del_timer(&sl->outfill_timer);
1143 spin_unlock_bh(&sl->lock);
1144 return 0;
1145
1146 case SIOCGOUTFILL:
1147 if (put_user(sl->outfill, p))
1148 return -EFAULT;
1149 return 0;
1150 /* VSV changes end */
1151#endif
1152 default:
1153 return tty_mode_ioctl(tty, file, cmd, arg);
1154 }
1155}
1156
1157#ifdef CONFIG_COMPAT
1158static long slip_compat_ioctl(struct tty_struct *tty, struct file *file,
1159 unsigned int cmd, unsigned long arg)
1160{
1161 switch (cmd) {
1162 case SIOCGIFNAME:
1163 case SIOCGIFENCAP:
1164 case SIOCSIFENCAP:
1165 case SIOCSIFHWADDR:
1166 case SIOCSKEEPALIVE:
1167 case SIOCGKEEPALIVE:
1168 case SIOCSOUTFILL:
1169 case SIOCGOUTFILL:
1170 return slip_ioctl(tty, file, cmd,
1171 (unsigned long)compat_ptr(arg));
1172 }
1173
1174 return -ENOIOCTLCMD;
1175}
1176#endif
1177
1178/* VSV changes start here */
1179#ifdef CONFIG_SLIP_SMART
1180/* function do_ioctl called from net/core/dev.c
1181 to allow get/set outfill/keepalive parameter
1182 by ifconfig */
1183
1184static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1185{
1186 struct slip *sl = netdev_priv(dev);
1187 unsigned long *p = (unsigned long *)&rq->ifr_ifru;
1188
1189 if (sl == NULL) /* Allocation failed ?? */
1190 return -ENODEV;
1191
1192 spin_lock_bh(&sl->lock);
1193
1194 if (!sl->tty) {
1195 spin_unlock_bh(&sl->lock);
1196 return -ENODEV;
1197 }
1198
1199 switch (cmd) {
1200 case SIOCSKEEPALIVE:
1201 /* max for unchar */
1202 if ((unsigned)*p > 255) {
1203 spin_unlock_bh(&sl->lock);
1204 return -EINVAL;
1205 }
1206 sl->keepalive = (u8)*p;
1207 if (sl->keepalive != 0) {
1208 sl->keepalive_timer.expires =
1209 jiffies + sl->keepalive * HZ;
1210 mod_timer(&sl->keepalive_timer,
1211 jiffies + sl->keepalive * HZ);
1212 set_bit(SLF_KEEPTEST, &sl->flags);
1213 } else
1214 del_timer(&sl->keepalive_timer);
1215 break;
1216
1217 case SIOCGKEEPALIVE:
1218 *p = sl->keepalive;
1219 break;
1220
1221 case SIOCSOUTFILL:
1222 if ((unsigned)*p > 255) { /* max for unchar */
1223 spin_unlock_bh(&sl->lock);
1224 return -EINVAL;
1225 }
1226 sl->outfill = (u8)*p;
1227 if (sl->outfill != 0) {
1228 mod_timer(&sl->outfill_timer,
1229 jiffies + sl->outfill * HZ);
1230 set_bit(SLF_OUTWAIT, &sl->flags);
1231 } else
1232 del_timer(&sl->outfill_timer);
1233 break;
1234
1235 case SIOCGOUTFILL:
1236 *p = sl->outfill;
1237 break;
1238
1239 case SIOCSLEASE:
1240 /* Resolve race condition, when ioctl'ing hanged up
1241 and opened by another process device.
1242 */
1243 if (sl->tty != current->signal->tty &&
1244 sl->pid != current->pid) {
1245 spin_unlock_bh(&sl->lock);
1246 return -EPERM;
1247 }
1248 sl->leased = 0;
1249 if (*p)
1250 sl->leased = 1;
1251 break;
1252
1253 case SIOCGLEASE:
1254 *p = sl->leased;
1255 }
1256 spin_unlock_bh(&sl->lock);
1257 return 0;
1258}
1259#endif
1260/* VSV changes end */
1261
1262static struct tty_ldisc_ops sl_ldisc = {
1263 .owner = THIS_MODULE,
1264 .magic = TTY_LDISC_MAGIC,
1265 .name = "slip",
1266 .open = slip_open,
1267 .close = slip_close,
1268 .hangup = slip_hangup,
1269 .ioctl = slip_ioctl,
1270#ifdef CONFIG_COMPAT
1271 .compat_ioctl = slip_compat_ioctl,
1272#endif
1273 .receive_buf = slip_receive_buf,
1274 .write_wakeup = slip_write_wakeup,
1275};
1276
1277static int __init slip_init(void)
1278{
1279 int status;
1280
1281 if (slip_maxdev < 4)
1282 slip_maxdev = 4; /* Sanity */
1283
1284 printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)"
1285#ifdef CONFIG_SLIP_MODE_SLIP6
1286 " (6 bit encapsulation enabled)"
1287#endif
1288 ".\n",
1289 SLIP_VERSION, slip_maxdev);
1290#if defined(SL_INCLUDE_CSLIP)
1291 printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n");
1292#endif
1293#ifdef CONFIG_SLIP_SMART
1294 printk(KERN_INFO "SLIP linefill/keepalive option.\n");
1295#endif
1296
1297 slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev,
1298 GFP_KERNEL);
1299 if (!slip_devs) {
1300 printk(KERN_ERR "SLIP: Can't allocate slip devices array.\n");
1301 return -ENOMEM;
1302 }
1303
1304 /* Fill in our line protocol discipline, and register it */
1305 status = tty_register_ldisc(N_SLIP, &sl_ldisc);
1306 if (status != 0) {
1307 printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status);
1308 kfree(slip_devs);
1309 }
1310 return status;
1311}
1312
1313static void __exit slip_exit(void)
1314{
1315 int i;
1316 struct net_device *dev;
1317 struct slip *sl;
1318 unsigned long timeout = jiffies + HZ;
1319 int busy = 0;
1320
1321 if (slip_devs == NULL)
1322 return;
1323
1324 /* First of all: check for active disciplines and hangup them.
1325 */
1326 do {
1327 if (busy)
1328 msleep_interruptible(100);
1329
1330 busy = 0;
1331 for (i = 0; i < slip_maxdev; i++) {
1332 dev = slip_devs[i];
1333 if (!dev)
1334 continue;
1335 sl = netdev_priv(dev);
1336 spin_lock_bh(&sl->lock);
1337 if (sl->tty) {
1338 busy++;
1339 tty_hangup(sl->tty);
1340 }
1341 spin_unlock_bh(&sl->lock);
1342 }
1343 } while (busy && time_before(jiffies, timeout));
1344
1345 /* FIXME: hangup is async so we should wait when doing this second
1346 phase */
1347
1348 for (i = 0; i < slip_maxdev; i++) {
1349 dev = slip_devs[i];
1350 if (!dev)
1351 continue;
1352 slip_devs[i] = NULL;
1353
1354 sl = netdev_priv(dev);
1355 if (sl->tty) {
1356 printk(KERN_ERR "%s: tty discipline still running\n",
1357 dev->name);
1358 /* Intentionally leak the control block. */
1359 dev->destructor = NULL;
1360 }
1361
1362 unregister_netdev(dev);
1363 }
1364
1365 kfree(slip_devs);
1366 slip_devs = NULL;
1367
1368 i = tty_unregister_ldisc(N_SLIP);
1369 if (i != 0)
1370 printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i);
1371}
1372
1373module_init(slip_init);
1374module_exit(slip_exit);
1375
1376#ifdef CONFIG_SLIP_SMART
1377/*
1378 * This is start of the code for multislip style line checking
1379 * added by Stanislav Voronyi. All changes before marked VSV
1380 */
1381
1382static void sl_outfill(unsigned long sls)
1383{
1384 struct slip *sl = (struct slip *)sls;
1385
1386 spin_lock(&sl->lock);
1387
1388 if (sl->tty == NULL)
1389 goto out;
1390
1391 if (sl->outfill) {
1392 if (test_bit(SLF_OUTWAIT, &sl->flags)) {
1393 /* no packets were transmitted, do outfill */
1394#ifdef CONFIG_SLIP_MODE_SLIP6
1395 unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END;
1396#else
1397 unsigned char s = END;
1398#endif
1399 /* put END into tty queue. Is it right ??? */
1400 if (!netif_queue_stopped(sl->dev)) {
1401 /* if device busy no outfill */
1402 sl->tty->ops->write(sl->tty, &s, 1);
1403 }
1404 } else
1405 set_bit(SLF_OUTWAIT, &sl->flags);
1406
1407 mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ);
1408 }
1409out:
1410 spin_unlock(&sl->lock);
1411}
1412
1413static void sl_keepalive(unsigned long sls)
1414{
1415 struct slip *sl = (struct slip *)sls;
1416
1417 spin_lock(&sl->lock);
1418
1419 if (sl->tty == NULL)
1420 goto out;
1421
1422 if (sl->keepalive) {
1423 if (test_bit(SLF_KEEPTEST, &sl->flags)) {
1424 /* keepalive still high :(, we must hangup */
1425 if (sl->outfill)
1426 /* outfill timer must be deleted too */
1427 (void)del_timer(&sl->outfill_timer);
1428 printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name);
1429 /* this must hangup tty & close slip */
1430 tty_hangup(sl->tty);
1431 /* I think we need not something else */
1432 goto out;
1433 } else
1434 set_bit(SLF_KEEPTEST, &sl->flags);
1435
1436 mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ);
1437 }
1438out:
1439 spin_unlock(&sl->lock);
1440}
1441
1442#endif
1443MODULE_LICENSE("GPL");
1444MODULE_ALIAS_LDISC(N_SLIP);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-01 20:37:43 -0500