Commit | Line | Data |
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1da177e4 LT |
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 mtu upwards. | |
15 | * Driver now spots this and grows/shrinks its buffers(hack!). | |
16 | * Memory leak if you run out of memory setting up a slip driver fixed. | |
17 | * Matt Dillon : Printable slip (borrowed from NET2E) | |
18 | * Pauline Middelink : Slip driver fixes. | |
19 | * Alan Cox : Honours the old SL_COMPRESSED flag | |
20 | * Alan Cox : KISS AX.25 and AXUI IP support | |
21 | * Michael Riepe : Automatic CSLIP recognition added | |
22 | * Charles Hedrick : CSLIP header length problem fix. | |
23 | * Alan Cox : Corrected non-IP cases of the above. | |
24 | * Alan Cox : Now uses hardware type as per FvK. | |
25 | * Alan Cox : Default to 192.168.0.0 (RFC 1597) | |
26 | * A.N.Kuznetsov : dev_tint() recursion fix. | |
27 | * Dmitry Gorodchanin : SLIP memory leaks | |
28 | * Dmitry Gorodchanin : Code cleanup. Reduce tty driver | |
29 | * buffering from 4096 to 256 bytes. | |
30 | * Improving SLIP response time. | |
31 | * CONFIG_SLIP_MODE_SLIP6. | |
32 | * ifconfig sl? up & down now works correctly. | |
33 | * Modularization. | |
34 | * Alan Cox : Oops - fix AX.25 buffer lengths | |
35 | * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP | |
36 | * statistics. Include CSLIP code only | |
37 | * if it really needed. | |
38 | * Alan Cox : Free slhc buffers in the right place. | |
39 | * Alan Cox : Allow for digipeated IP over AX.25 | |
40 | * Matti Aarnio : Dynamic SLIP devices, with ideas taken | |
41 | * from Jim Freeman's <jfree@caldera.com> | |
42 | * dynamic PPP devices. We do NOT kfree() | |
43 | * device entries, just reg./unreg. them | |
44 | * as they are needed. We kfree() them | |
45 | * at module cleanup. | |
46 | * With MODULE-loading ``insmod'', user can | |
47 | * issue parameter: slip_maxdev=1024 | |
48 | * (Or how much he/she wants.. Default is 256) | |
49 | * * Stanislav Voronyi : Slip line checking, with ideas taken | |
50 | * from multislip BSDI driver which was written | |
51 | * by Igor Chechik, RELCOM Corp. Only algorithms | |
52 | * have been ported to Linux SLIP driver. | |
53 | * Vitaly E. Lavrov : Sane behaviour on tty hangup. | |
54 | * Alexey Kuznetsov : Cleanup interfaces to tty&netdevice modules. | |
55 | */ | |
56 | ||
57 | #define SL_CHECK_TRANSMIT | |
58 | #include <linux/config.h> | |
59 | #include <linux/module.h> | |
60 | #include <linux/moduleparam.h> | |
61 | ||
62 | #include <asm/system.h> | |
63 | #include <asm/uaccess.h> | |
64 | #include <linux/bitops.h> | |
65 | #include <linux/string.h> | |
66 | #include <linux/mm.h> | |
67 | #include <linux/interrupt.h> | |
68 | #include <linux/in.h> | |
69 | #include <linux/tty.h> | |
70 | #include <linux/errno.h> | |
71 | #include <linux/netdevice.h> | |
72 | #include <linux/etherdevice.h> | |
73 | #include <linux/skbuff.h> | |
74 | #include <linux/rtnetlink.h> | |
75 | #include <linux/if_arp.h> | |
76 | #include <linux/if_slip.h> | |
77 | #include <linux/init.h> | |
78 | #include "slip.h" | |
79 | #ifdef CONFIG_INET | |
80 | #include <linux/ip.h> | |
81 | #include <linux/tcp.h> | |
82 | #include <net/slhc_vj.h> | |
83 | #endif | |
84 | ||
85 | #define SLIP_VERSION "0.8.4-NET3.019-NEWTTY" | |
86 | ||
87 | static struct net_device **slip_devs; | |
88 | ||
89 | static int slip_maxdev = SL_NRUNIT; | |
90 | module_param(slip_maxdev, int, 0); | |
91 | MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices"); | |
92 | ||
93 | static int slip_esc(unsigned char *p, unsigned char *d, int len); | |
94 | static void slip_unesc(struct slip *sl, unsigned char c); | |
95 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
96 | static int slip_esc6(unsigned char *p, unsigned char *d, int len); | |
97 | static void slip_unesc6(struct slip *sl, unsigned char c); | |
98 | #endif | |
99 | #ifdef CONFIG_SLIP_SMART | |
100 | static void sl_keepalive(unsigned long sls); | |
101 | static void sl_outfill(unsigned long sls); | |
102 | static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd); | |
103 | #endif | |
104 | ||
105 | /******************************** | |
106 | * Buffer administration routines: | |
107 | * sl_alloc_bufs() | |
108 | * sl_free_bufs() | |
109 | * sl_realloc_bufs() | |
110 | * | |
111 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
112 | * sl_realloc_bufs provides strong atomicity and reallocation | |
113 | * on actively running device. | |
114 | *********************************/ | |
115 | ||
116 | /* | |
117 | Allocate channel buffers. | |
118 | */ | |
119 | ||
120 | static int | |
121 | sl_alloc_bufs(struct slip *sl, int mtu) | |
122 | { | |
123 | int err = -ENOBUFS; | |
124 | unsigned long len; | |
125 | char * rbuff = NULL; | |
126 | char * xbuff = NULL; | |
127 | #ifdef SL_INCLUDE_CSLIP | |
128 | char * cbuff = NULL; | |
129 | struct slcompress *slcomp = NULL; | |
130 | #endif | |
131 | ||
132 | /* | |
133 | * Allocate the SLIP frame buffers: | |
134 | * | |
135 | * rbuff Receive buffer. | |
136 | * xbuff Transmit buffer. | |
137 | * cbuff Temporary compression buffer. | |
138 | */ | |
139 | len = mtu * 2; | |
140 | ||
141 | /* | |
142 | * allow for arrival of larger UDP packets, even if we say not to | |
143 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
144 | * an MSS of 128 | |
145 | */ | |
146 | if (len < 576 * 2) | |
147 | len = 576 * 2; | |
148 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
149 | if (rbuff == NULL) | |
150 | goto err_exit; | |
151 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
152 | if (xbuff == NULL) | |
153 | goto err_exit; | |
154 | #ifdef SL_INCLUDE_CSLIP | |
155 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
156 | if (cbuff == NULL) | |
157 | goto err_exit; | |
158 | slcomp = slhc_init(16, 16); | |
159 | if (slcomp == NULL) | |
160 | goto err_exit; | |
161 | #endif | |
162 | spin_lock_bh(&sl->lock); | |
163 | if (sl->tty == NULL) { | |
164 | spin_unlock_bh(&sl->lock); | |
165 | err = -ENODEV; | |
166 | goto err_exit; | |
167 | } | |
168 | sl->mtu = mtu; | |
169 | sl->buffsize = len; | |
170 | sl->rcount = 0; | |
171 | sl->xleft = 0; | |
172 | rbuff = xchg(&sl->rbuff, rbuff); | |
173 | xbuff = xchg(&sl->xbuff, xbuff); | |
174 | #ifdef SL_INCLUDE_CSLIP | |
175 | cbuff = xchg(&sl->cbuff, cbuff); | |
176 | slcomp = xchg(&sl->slcomp, slcomp); | |
177 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
178 | sl->xdata = 0; | |
179 | sl->xbits = 0; | |
180 | #endif | |
181 | #endif | |
182 | spin_unlock_bh(&sl->lock); | |
183 | err = 0; | |
184 | ||
185 | /* Cleanup */ | |
186 | err_exit: | |
187 | #ifdef SL_INCLUDE_CSLIP | |
188 | if (cbuff) | |
189 | kfree(cbuff); | |
190 | if (slcomp) | |
191 | slhc_free(slcomp); | |
192 | #endif | |
193 | if (xbuff) | |
194 | kfree(xbuff); | |
195 | if (rbuff) | |
196 | kfree(rbuff); | |
197 | return err; | |
198 | } | |
199 | ||
200 | /* Free a SLIP channel buffers. */ | |
201 | static void | |
202 | sl_free_bufs(struct slip *sl) | |
203 | { | |
204 | void * tmp; | |
205 | ||
206 | /* Free all SLIP frame buffers. */ | |
207 | if ((tmp = xchg(&sl->rbuff, NULL)) != NULL) | |
208 | kfree(tmp); | |
209 | if ((tmp = xchg(&sl->xbuff, NULL)) != NULL) | |
210 | kfree(tmp); | |
211 | #ifdef SL_INCLUDE_CSLIP | |
212 | if ((tmp = xchg(&sl->cbuff, NULL)) != NULL) | |
213 | kfree(tmp); | |
214 | if ((tmp = xchg(&sl->slcomp, NULL)) != NULL) | |
215 | slhc_free(tmp); | |
216 | #endif | |
217 | } | |
218 | ||
219 | /* | |
220 | Reallocate slip channel buffers. | |
221 | */ | |
222 | ||
223 | static int sl_realloc_bufs(struct slip *sl, int mtu) | |
224 | { | |
225 | int err = 0; | |
226 | struct net_device *dev = sl->dev; | |
227 | unsigned char *xbuff, *rbuff; | |
228 | #ifdef SL_INCLUDE_CSLIP | |
229 | unsigned char *cbuff; | |
230 | #endif | |
231 | int len = mtu * 2; | |
232 | ||
233 | /* | |
234 | * allow for arrival of larger UDP packets, even if we say not to | |
235 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
236 | * an MSS of 128 | |
237 | */ | |
238 | if (len < 576 * 2) | |
239 | len = 576 * 2; | |
240 | ||
241 | xbuff = (unsigned char *) kmalloc (len + 4, GFP_ATOMIC); | |
242 | rbuff = (unsigned char *) kmalloc (len + 4, GFP_ATOMIC); | |
243 | #ifdef SL_INCLUDE_CSLIP | |
244 | cbuff = (unsigned char *) kmalloc (len + 4, GFP_ATOMIC); | |
245 | #endif | |
246 | ||
247 | ||
248 | #ifdef SL_INCLUDE_CSLIP | |
249 | if (xbuff == NULL || rbuff == NULL || cbuff == NULL) { | |
250 | #else | |
251 | if (xbuff == NULL || rbuff == NULL) { | |
252 | #endif | |
253 | if (mtu >= sl->mtu) { | |
254 | printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n", | |
255 | dev->name); | |
256 | err = -ENOBUFS; | |
257 | } | |
258 | goto done; | |
259 | } | |
260 | ||
261 | spin_lock_bh(&sl->lock); | |
262 | ||
263 | err = -ENODEV; | |
264 | if (sl->tty == NULL) | |
265 | goto done_on_bh; | |
266 | ||
267 | xbuff = xchg(&sl->xbuff, xbuff); | |
268 | rbuff = xchg(&sl->rbuff, rbuff); | |
269 | #ifdef SL_INCLUDE_CSLIP | |
270 | cbuff = xchg(&sl->cbuff, cbuff); | |
271 | #endif | |
272 | if (sl->xleft) { | |
273 | if (sl->xleft <= len) { | |
274 | memcpy(sl->xbuff, sl->xhead, sl->xleft); | |
275 | } else { | |
276 | sl->xleft = 0; | |
277 | sl->tx_dropped++; | |
278 | } | |
279 | } | |
280 | sl->xhead = sl->xbuff; | |
281 | ||
282 | if (sl->rcount) { | |
283 | if (sl->rcount <= len) { | |
284 | memcpy(sl->rbuff, rbuff, sl->rcount); | |
285 | } else { | |
286 | sl->rcount = 0; | |
287 | sl->rx_over_errors++; | |
288 | set_bit(SLF_ERROR, &sl->flags); | |
289 | } | |
290 | } | |
291 | sl->mtu = mtu; | |
292 | dev->mtu = mtu; | |
293 | sl->buffsize = len; | |
294 | err = 0; | |
295 | ||
296 | done_on_bh: | |
297 | spin_unlock_bh(&sl->lock); | |
298 | ||
299 | done: | |
300 | if (xbuff) | |
301 | kfree(xbuff); | |
302 | if (rbuff) | |
303 | kfree(rbuff); | |
304 | #ifdef SL_INCLUDE_CSLIP | |
305 | if (cbuff) | |
306 | kfree(cbuff); | |
307 | #endif | |
308 | return err; | |
309 | } | |
310 | ||
311 | ||
312 | /* Set the "sending" flag. This must be atomic hence the set_bit. */ | |
313 | static inline void | |
314 | sl_lock(struct slip *sl) | |
315 | { | |
316 | netif_stop_queue(sl->dev); | |
317 | } | |
318 | ||
319 | ||
320 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ | |
321 | static inline void | |
322 | sl_unlock(struct slip *sl) | |
323 | { | |
324 | netif_wake_queue(sl->dev); | |
325 | } | |
326 | ||
327 | /* Send one completely decapsulated IP datagram to the IP layer. */ | |
328 | static void | |
329 | sl_bump(struct slip *sl) | |
330 | { | |
331 | struct sk_buff *skb; | |
332 | int count; | |
333 | ||
334 | count = sl->rcount; | |
335 | #ifdef SL_INCLUDE_CSLIP | |
336 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
337 | unsigned char c; | |
338 | if ((c = sl->rbuff[0]) & SL_TYPE_COMPRESSED_TCP) { | |
339 | /* ignore compressed packets when CSLIP is off */ | |
340 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
341 | printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name); | |
342 | return; | |
343 | } | |
344 | /* make sure we've reserved enough space for uncompress to use */ | |
345 | if (count + 80 > sl->buffsize) { | |
346 | sl->rx_over_errors++; | |
347 | return; | |
348 | } | |
349 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
350 | if (count <= 0) { | |
351 | return; | |
352 | } | |
353 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { | |
354 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
355 | /* turn on header compression */ | |
356 | sl->mode |= SL_MODE_CSLIP; | |
357 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
358 | printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name); | |
359 | } | |
360 | sl->rbuff[0] &= 0x4f; | |
361 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) { | |
362 | return; | |
363 | } | |
364 | } | |
365 | } | |
366 | #endif /* SL_INCLUDE_CSLIP */ | |
367 | ||
368 | sl->rx_bytes+=count; | |
369 | ||
370 | skb = dev_alloc_skb(count); | |
371 | if (skb == NULL) { | |
372 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name); | |
373 | sl->rx_dropped++; | |
374 | return; | |
375 | } | |
376 | skb->dev = sl->dev; | |
377 | memcpy(skb_put(skb,count), sl->rbuff, count); | |
378 | skb->mac.raw=skb->data; | |
379 | skb->protocol=htons(ETH_P_IP); | |
380 | netif_rx(skb); | |
381 | sl->dev->last_rx = jiffies; | |
382 | sl->rx_packets++; | |
383 | } | |
384 | ||
385 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
386 | static void | |
387 | sl_encaps(struct slip *sl, unsigned char *icp, int len) | |
388 | { | |
389 | unsigned char *p; | |
390 | int actual, count; | |
391 | ||
392 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
393 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
394 | sl->tx_dropped++; | |
395 | sl_unlock(sl); | |
396 | return; | |
397 | } | |
398 | ||
399 | p = icp; | |
400 | #ifdef SL_INCLUDE_CSLIP | |
401 | if (sl->mode & SL_MODE_CSLIP) { | |
402 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); | |
403 | } | |
404 | #endif | |
405 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
406 | if(sl->mode & SL_MODE_SLIP6) | |
407 | count = slip_esc6(p, (unsigned char *) sl->xbuff, len); | |
408 | else | |
409 | #endif | |
410 | count = slip_esc(p, (unsigned char *) sl->xbuff, len); | |
411 | ||
412 | /* Order of next two lines is *very* important. | |
413 | * When we are sending a little amount of data, | |
414 | * the transfer may be completed inside driver.write() | |
415 | * routine, because it's running with interrupts enabled. | |
416 | * In this case we *never* got WRITE_WAKEUP event, | |
417 | * if we did not request it before write operation. | |
418 | * 14 Oct 1994 Dmitry Gorodchanin. | |
419 | */ | |
420 | sl->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); | |
421 | actual = sl->tty->driver->write(sl->tty, sl->xbuff, count); | |
422 | #ifdef SL_CHECK_TRANSMIT | |
423 | sl->dev->trans_start = jiffies; | |
424 | #endif | |
425 | sl->xleft = count - actual; | |
426 | sl->xhead = sl->xbuff + actual; | |
427 | #ifdef CONFIG_SLIP_SMART | |
428 | /* VSV */ | |
429 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
430 | #endif | |
431 | } | |
432 | ||
433 | /* | |
434 | * Called by the driver when there's room for more data. If we have | |
435 | * more packets to send, we send them here. | |
436 | */ | |
437 | static void slip_write_wakeup(struct tty_struct *tty) | |
438 | { | |
439 | int actual; | |
440 | struct slip *sl = (struct slip *) tty->disc_data; | |
441 | ||
442 | /* First make sure we're connected. */ | |
443 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) { | |
444 | return; | |
445 | } | |
446 | if (sl->xleft <= 0) { | |
447 | /* Now serial buffer is almost free & we can start | |
448 | * transmission of another packet */ | |
449 | sl->tx_packets++; | |
450 | tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
451 | sl_unlock(sl); | |
452 | return; | |
453 | } | |
454 | ||
455 | actual = tty->driver->write(tty, sl->xhead, sl->xleft); | |
456 | sl->xleft -= actual; | |
457 | sl->xhead += actual; | |
458 | } | |
459 | ||
460 | static void sl_tx_timeout(struct net_device *dev) | |
461 | { | |
462 | struct slip *sl = netdev_priv(dev); | |
463 | ||
464 | spin_lock(&sl->lock); | |
465 | ||
466 | if (netif_queue_stopped(dev)) { | |
467 | if (!netif_running(dev)) | |
468 | goto out; | |
469 | ||
470 | /* May be we must check transmitter timeout here ? | |
471 | * 14 Oct 1994 Dmitry Gorodchanin. | |
472 | */ | |
473 | #ifdef SL_CHECK_TRANSMIT | |
474 | if (time_before(jiffies, dev->trans_start + 20 * HZ)) { | |
475 | /* 20 sec timeout not reached */ | |
476 | goto out; | |
477 | } | |
478 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, | |
479 | (sl->tty->driver->chars_in_buffer(sl->tty) || sl->xleft) ? | |
480 | "bad line quality" : "driver error"); | |
481 | sl->xleft = 0; | |
482 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
483 | sl_unlock(sl); | |
484 | #endif | |
485 | } | |
486 | ||
487 | out: | |
488 | spin_unlock(&sl->lock); | |
489 | } | |
490 | ||
491 | ||
492 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
493 | static int | |
494 | sl_xmit(struct sk_buff *skb, struct net_device *dev) | |
495 | { | |
496 | struct slip *sl = netdev_priv(dev); | |
497 | ||
498 | spin_lock(&sl->lock); | |
499 | if (!netif_running(dev)) { | |
500 | spin_unlock(&sl->lock); | |
501 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
502 | dev_kfree_skb(skb); | |
503 | return 0; | |
504 | } | |
505 | if (sl->tty == NULL) { | |
506 | spin_unlock(&sl->lock); | |
507 | dev_kfree_skb(skb); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | sl_lock(sl); | |
512 | sl->tx_bytes+=skb->len; | |
513 | sl_encaps(sl, skb->data, skb->len); | |
514 | spin_unlock(&sl->lock); | |
515 | ||
516 | dev_kfree_skb(skb); | |
517 | return 0; | |
518 | } | |
519 | ||
520 | ||
521 | /****************************************** | |
522 | * Routines looking at netdevice side. | |
523 | ******************************************/ | |
524 | ||
525 | /* Netdevice UP -> DOWN routine */ | |
526 | ||
527 | static int | |
528 | sl_close(struct net_device *dev) | |
529 | { | |
530 | struct slip *sl = netdev_priv(dev); | |
531 | ||
532 | spin_lock_bh(&sl->lock); | |
533 | if (sl->tty) { | |
534 | /* TTY discipline is running. */ | |
535 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
536 | } | |
537 | netif_stop_queue(dev); | |
538 | sl->rcount = 0; | |
539 | sl->xleft = 0; | |
540 | spin_unlock_bh(&sl->lock); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | /* Netdevice DOWN -> UP routine */ | |
546 | ||
547 | static int sl_open(struct net_device *dev) | |
548 | { | |
549 | struct slip *sl = netdev_priv(dev); | |
550 | ||
551 | if (sl->tty==NULL) | |
552 | return -ENODEV; | |
553 | ||
554 | sl->flags &= (1 << SLF_INUSE); | |
555 | netif_start_queue(dev); | |
556 | return 0; | |
557 | } | |
558 | ||
559 | /* Netdevice change MTU request */ | |
560 | ||
561 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
562 | { | |
563 | struct slip *sl = netdev_priv(dev); | |
564 | ||
565 | if (new_mtu < 68 || new_mtu > 65534) | |
566 | return -EINVAL; | |
567 | ||
568 | if (new_mtu != dev->mtu) | |
569 | return sl_realloc_bufs(sl, new_mtu); | |
570 | return 0; | |
571 | } | |
572 | ||
573 | /* Netdevice get statistics request */ | |
574 | ||
575 | static struct net_device_stats * | |
576 | sl_get_stats(struct net_device *dev) | |
577 | { | |
578 | static struct net_device_stats stats; | |
579 | struct slip *sl = netdev_priv(dev); | |
580 | #ifdef SL_INCLUDE_CSLIP | |
581 | struct slcompress *comp; | |
582 | #endif | |
583 | ||
584 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
585 | ||
586 | stats.rx_packets = sl->rx_packets; | |
587 | stats.tx_packets = sl->tx_packets; | |
588 | stats.rx_bytes = sl->rx_bytes; | |
589 | stats.tx_bytes = sl->tx_bytes; | |
590 | stats.rx_dropped = sl->rx_dropped; | |
591 | stats.tx_dropped = sl->tx_dropped; | |
592 | stats.tx_errors = sl->tx_errors; | |
593 | stats.rx_errors = sl->rx_errors; | |
594 | stats.rx_over_errors = sl->rx_over_errors; | |
595 | #ifdef SL_INCLUDE_CSLIP | |
596 | stats.rx_fifo_errors = sl->rx_compressed; | |
597 | stats.tx_fifo_errors = sl->tx_compressed; | |
598 | stats.collisions = sl->tx_misses; | |
599 | comp = sl->slcomp; | |
600 | if (comp) { | |
601 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
602 | stats.rx_dropped += comp->sls_i_tossed; | |
603 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
604 | stats.collisions += comp->sls_o_misses; | |
605 | } | |
606 | #endif /* CONFIG_INET */ | |
607 | return (&stats); | |
608 | } | |
609 | ||
610 | /* Netdevice register callback */ | |
611 | ||
612 | static int sl_init(struct net_device *dev) | |
613 | { | |
614 | struct slip *sl = netdev_priv(dev); | |
615 | ||
616 | /* | |
617 | * Finish setting up the DEVICE info. | |
618 | */ | |
619 | ||
620 | dev->mtu = sl->mtu; | |
621 | dev->type = ARPHRD_SLIP + sl->mode; | |
622 | #ifdef SL_CHECK_TRANSMIT | |
623 | dev->tx_timeout = sl_tx_timeout; | |
624 | dev->watchdog_timeo = 20*HZ; | |
625 | #endif | |
626 | return 0; | |
627 | } | |
628 | ||
629 | ||
630 | static void sl_uninit(struct net_device *dev) | |
631 | { | |
632 | struct slip *sl = netdev_priv(dev); | |
633 | ||
634 | sl_free_bufs(sl); | |
635 | } | |
636 | ||
637 | static void sl_setup(struct net_device *dev) | |
638 | { | |
639 | dev->init = sl_init; | |
640 | dev->uninit = sl_uninit; | |
641 | dev->open = sl_open; | |
642 | dev->destructor = free_netdev; | |
643 | dev->stop = sl_close; | |
644 | dev->get_stats = sl_get_stats; | |
645 | dev->change_mtu = sl_change_mtu; | |
646 | dev->hard_start_xmit = sl_xmit; | |
647 | #ifdef CONFIG_SLIP_SMART | |
648 | dev->do_ioctl = sl_ioctl; | |
649 | #endif | |
650 | dev->hard_header_len = 0; | |
651 | dev->addr_len = 0; | |
652 | dev->tx_queue_len = 10; | |
653 | ||
654 | SET_MODULE_OWNER(dev); | |
655 | ||
656 | /* New-style flags. */ | |
657 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
658 | } | |
659 | ||
660 | /****************************************** | |
661 | Routines looking at TTY side. | |
662 | ******************************************/ | |
663 | ||
664 | ||
665 | static int slip_receive_room(struct tty_struct *tty) | |
666 | { | |
667 | return 65536; /* We can handle an infinite amount of data. :-) */ | |
668 | } | |
669 | ||
670 | /* | |
671 | * Handle the 'receiver data ready' interrupt. | |
672 | * This function is called by the 'tty_io' module in the kernel when | |
673 | * a block of SLIP data has been received, which can now be decapsulated | |
674 | * and sent on to some IP layer for further processing. This will not | |
675 | * be re-entered while running but other ldisc functions may be called | |
676 | * in parallel | |
677 | */ | |
678 | ||
679 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) | |
680 | { | |
681 | struct slip *sl = (struct slip *) tty->disc_data; | |
682 | ||
683 | if (!sl || sl->magic != SLIP_MAGIC || | |
684 | !netif_running(sl->dev)) | |
685 | return; | |
686 | ||
687 | /* Read the characters out of the buffer */ | |
688 | while (count--) { | |
689 | if (fp && *fp++) { | |
690 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) { | |
691 | sl->rx_errors++; | |
692 | } | |
693 | cp++; | |
694 | continue; | |
695 | } | |
696 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
697 | if (sl->mode & SL_MODE_SLIP6) | |
698 | slip_unesc6(sl, *cp++); | |
699 | else | |
700 | #endif | |
701 | slip_unesc(sl, *cp++); | |
702 | } | |
703 | } | |
704 | ||
705 | /************************************ | |
706 | * slip_open helper routines. | |
707 | ************************************/ | |
708 | ||
709 | /* Collect hanged up channels */ | |
710 | ||
711 | static void sl_sync(void) | |
712 | { | |
713 | int i; | |
714 | struct net_device *dev; | |
715 | struct slip *sl; | |
716 | ||
717 | for (i = 0; i < slip_maxdev; i++) { | |
718 | if ((dev = slip_devs[i]) == NULL) | |
719 | break; | |
720 | ||
721 | sl = netdev_priv(dev); | |
722 | if (sl->tty || sl->leased) | |
723 | continue; | |
724 | if (dev->flags&IFF_UP) | |
725 | dev_close(dev); | |
726 | } | |
727 | } | |
728 | ||
729 | ||
730 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
731 | static struct slip * | |
732 | sl_alloc(dev_t line) | |
733 | { | |
734 | int i; | |
735 | int sel = -1; | |
736 | int score = -1; | |
737 | struct net_device *dev = NULL; | |
738 | struct slip *sl; | |
739 | ||
740 | if (slip_devs == NULL) | |
741 | return NULL; /* Master array missing ! */ | |
742 | ||
743 | for (i = 0; i < slip_maxdev; i++) { | |
744 | dev = slip_devs[i]; | |
745 | if (dev == NULL) | |
746 | break; | |
747 | ||
748 | sl = netdev_priv(dev); | |
749 | if (sl->leased) { | |
750 | if (sl->line != line) | |
751 | continue; | |
752 | if (sl->tty) | |
753 | return NULL; | |
754 | ||
755 | /* Clear ESCAPE & ERROR flags */ | |
756 | sl->flags &= (1 << SLF_INUSE); | |
757 | return sl; | |
758 | } | |
759 | ||
760 | if (sl->tty) | |
761 | continue; | |
762 | ||
763 | if (current->pid == sl->pid) { | |
764 | if (sl->line == line && score < 3) { | |
765 | sel = i; | |
766 | score = 3; | |
767 | continue; | |
768 | } | |
769 | if (score < 2) { | |
770 | sel = i; | |
771 | score = 2; | |
772 | } | |
773 | continue; | |
774 | } | |
775 | if (sl->line == line && score < 1) { | |
776 | sel = i; | |
777 | score = 1; | |
778 | continue; | |
779 | } | |
780 | if (score < 0) { | |
781 | sel = i; | |
782 | score = 0; | |
783 | } | |
784 | } | |
785 | ||
786 | if (sel >= 0) { | |
787 | i = sel; | |
788 | dev = slip_devs[i]; | |
789 | if (score > 1) { | |
790 | sl = netdev_priv(dev); | |
791 | sl->flags &= (1 << SLF_INUSE); | |
792 | return sl; | |
793 | } | |
794 | } | |
795 | ||
796 | /* Sorry, too many, all slots in use */ | |
797 | if (i >= slip_maxdev) | |
798 | return NULL; | |
799 | ||
800 | if (dev) { | |
801 | sl = netdev_priv(dev); | |
802 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
803 | unregister_netdevice(dev); | |
804 | dev = NULL; | |
805 | slip_devs[i] = NULL; | |
806 | } | |
807 | } | |
808 | ||
809 | if (!dev) { | |
810 | char name[IFNAMSIZ]; | |
811 | sprintf(name, "sl%d", i); | |
812 | ||
813 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
814 | if (!dev) | |
815 | return NULL; | |
816 | dev->base_addr = i; | |
817 | } | |
818 | ||
819 | sl = netdev_priv(dev); | |
820 | ||
821 | /* Initialize channel control data */ | |
822 | sl->magic = SLIP_MAGIC; | |
823 | sl->dev = dev; | |
824 | spin_lock_init(&sl->lock); | |
825 | sl->mode = SL_MODE_DEFAULT; | |
826 | #ifdef CONFIG_SLIP_SMART | |
827 | init_timer(&sl->keepalive_timer); /* initialize timer_list struct */ | |
828 | sl->keepalive_timer.data=(unsigned long)sl; | |
829 | sl->keepalive_timer.function=sl_keepalive; | |
830 | init_timer(&sl->outfill_timer); | |
831 | sl->outfill_timer.data=(unsigned long)sl; | |
832 | sl->outfill_timer.function=sl_outfill; | |
833 | #endif | |
834 | slip_devs[i] = dev; | |
835 | ||
836 | return sl; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Open the high-level part of the SLIP channel. | |
841 | * This function is called by the TTY module when the | |
842 | * SLIP line discipline is called for. Because we are | |
843 | * sure the tty line exists, we only have to link it to | |
844 | * a free SLIP channel... | |
845 | * | |
846 | * Called in process context serialized from other ldisc calls. | |
847 | */ | |
848 | ||
849 | static int slip_open(struct tty_struct *tty) | |
850 | { | |
851 | struct slip *sl; | |
852 | int err; | |
853 | ||
854 | if(!capable(CAP_NET_ADMIN)) | |
855 | return -EPERM; | |
856 | ||
857 | /* RTnetlink lock is misused here to serialize concurrent | |
858 | opens of slip channels. There are better ways, but it is | |
859 | the simplest one. | |
860 | */ | |
861 | rtnl_lock(); | |
862 | ||
863 | /* Collect hanged up channels. */ | |
864 | sl_sync(); | |
865 | ||
866 | sl = (struct slip *) tty->disc_data; | |
867 | ||
868 | err = -EEXIST; | |
869 | /* First make sure we're not already connected. */ | |
870 | if (sl && sl->magic == SLIP_MAGIC) | |
871 | goto err_exit; | |
872 | ||
873 | /* OK. Find a free SLIP channel to use. */ | |
874 | err = -ENFILE; | |
875 | if ((sl = sl_alloc(tty_devnum(tty))) == NULL) | |
876 | goto err_exit; | |
877 | ||
878 | sl->tty = tty; | |
879 | tty->disc_data = sl; | |
880 | sl->line = tty_devnum(tty); | |
881 | sl->pid = current->pid; | |
882 | ||
883 | /* FIXME: already done before we were called - seems this can go */ | |
884 | if (tty->driver->flush_buffer) | |
885 | tty->driver->flush_buffer(tty); | |
886 | ||
887 | if (!test_bit(SLF_INUSE, &sl->flags)) { | |
888 | /* Perform the low-level SLIP initialization. */ | |
889 | if ((err = sl_alloc_bufs(sl, SL_MTU)) != 0) | |
890 | goto err_free_chan; | |
891 | ||
892 | set_bit(SLF_INUSE, &sl->flags); | |
893 | ||
894 | if ((err = register_netdevice(sl->dev))) | |
895 | goto err_free_bufs; | |
896 | } | |
897 | ||
898 | #ifdef CONFIG_SLIP_SMART | |
899 | if (sl->keepalive) { | |
900 | sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ; | |
901 | add_timer (&sl->keepalive_timer); | |
902 | } | |
903 | if (sl->outfill) { | |
904 | sl->outfill_timer.expires=jiffies+sl->outfill*HZ; | |
905 | add_timer (&sl->outfill_timer); | |
906 | } | |
907 | #endif | |
908 | ||
909 | /* Done. We have linked the TTY line to a channel. */ | |
910 | rtnl_unlock(); | |
911 | return sl->dev->base_addr; | |
912 | ||
913 | err_free_bufs: | |
914 | sl_free_bufs(sl); | |
915 | ||
916 | err_free_chan: | |
917 | sl->tty = NULL; | |
918 | tty->disc_data = NULL; | |
919 | clear_bit(SLF_INUSE, &sl->flags); | |
920 | ||
921 | err_exit: | |
922 | rtnl_unlock(); | |
923 | ||
924 | /* Count references from TTY module */ | |
925 | return err; | |
926 | } | |
927 | ||
928 | /* | |
929 | ||
930 | FIXME: 1,2 are fixed 3 was never true anyway. | |
931 | ||
932 | Let me to blame a bit. | |
933 | 1. TTY module calls this funstion on soft interrupt. | |
934 | 2. TTY module calls this function WITH MASKED INTERRUPTS! | |
935 | 3. TTY module does not notify us about line discipline | |
936 | shutdown, | |
937 | ||
938 | Seems, now it is clean. The solution is to consider netdevice and | |
939 | line discipline sides as two independent threads. | |
940 | ||
941 | By-product (not desired): sl? does not feel hangups and remains open. | |
942 | It is supposed, that user level program (dip, diald, slattach...) | |
943 | will catch SIGHUP and make the rest of work. | |
944 | ||
945 | I see no way to make more with current tty code. --ANK | |
946 | */ | |
947 | ||
948 | /* | |
949 | * Close down a SLIP channel. | |
950 | * This means flushing out any pending queues, and then returning. This | |
951 | * call is serialized against other ldisc functions. | |
952 | */ | |
953 | static void | |
954 | slip_close(struct tty_struct *tty) | |
955 | { | |
956 | struct slip *sl = (struct slip *) tty->disc_data; | |
957 | ||
958 | /* First make sure we're connected. */ | |
959 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
960 | return; | |
961 | ||
962 | tty->disc_data = NULL; | |
963 | sl->tty = NULL; | |
964 | if (!sl->leased) | |
965 | sl->line = 0; | |
966 | ||
967 | /* VSV = very important to remove timers */ | |
968 | #ifdef CONFIG_SLIP_SMART | |
969 | del_timer_sync(&sl->keepalive_timer); | |
970 | del_timer_sync(&sl->outfill_timer); | |
971 | #endif | |
972 | ||
973 | /* Count references from TTY module */ | |
974 | } | |
975 | ||
976 | /************************************************************************ | |
977 | * STANDARD SLIP ENCAPSULATION * | |
978 | ************************************************************************/ | |
979 | ||
980 | int | |
981 | slip_esc(unsigned char *s, unsigned char *d, int len) | |
982 | { | |
983 | unsigned char *ptr = d; | |
984 | unsigned char c; | |
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++ = END; | |
993 | ||
994 | /* | |
995 | * For each byte in the packet, send the appropriate | |
996 | * character sequence, according to the SLIP protocol. | |
997 | */ | |
998 | ||
999 | while (len-- > 0) { | |
1000 | switch(c = *s++) { | |
1001 | case END: | |
1002 | *ptr++ = ESC; | |
1003 | *ptr++ = ESC_END; | |
1004 | break; | |
1005 | case ESC: | |
1006 | *ptr++ = ESC; | |
1007 | *ptr++ = ESC_ESC; | |
1008 | break; | |
1009 | default: | |
1010 | *ptr++ = c; | |
1011 | break; | |
1012 | } | |
1013 | } | |
1014 | *ptr++ = END; | |
1015 | return (ptr - d); | |
1016 | } | |
1017 | ||
1018 | static void slip_unesc(struct slip *sl, unsigned char s) | |
1019 | { | |
1020 | ||
1021 | switch(s) { | |
1022 | case END: | |
1023 | #ifdef CONFIG_SLIP_SMART | |
1024 | /* drop keeptest bit = VSV */ | |
1025 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1026 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1027 | #endif | |
1028 | ||
1029 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && (sl->rcount > 2)) { | |
1030 | sl_bump(sl); | |
1031 | } | |
1032 | clear_bit(SLF_ESCAPE, &sl->flags); | |
1033 | sl->rcount = 0; | |
1034 | return; | |
1035 | ||
1036 | case ESC: | |
1037 | set_bit(SLF_ESCAPE, &sl->flags); | |
1038 | return; | |
1039 | case ESC_ESC: | |
1040 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) { | |
1041 | s = ESC; | |
1042 | } | |
1043 | break; | |
1044 | case ESC_END: | |
1045 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) { | |
1046 | s = END; | |
1047 | } | |
1048 | break; | |
1049 | } | |
1050 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1051 | if (sl->rcount < sl->buffsize) { | |
1052 | sl->rbuff[sl->rcount++] = s; | |
1053 | return; | |
1054 | } | |
1055 | sl->rx_over_errors++; | |
1056 | set_bit(SLF_ERROR, &sl->flags); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | ||
1061 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1062 | /************************************************************************ | |
1063 | * 6 BIT SLIP ENCAPSULATION * | |
1064 | ************************************************************************/ | |
1065 | ||
1066 | int | |
1067 | slip_esc6(unsigned char *s, unsigned char *d, int len) | |
1068 | { | |
1069 | unsigned char *ptr = d; | |
1070 | unsigned char c; | |
1071 | int i; | |
1072 | unsigned short v = 0; | |
1073 | short bits = 0; | |
1074 | ||
1075 | /* | |
1076 | * Send an initial END character to flush out any | |
1077 | * data that may have accumulated in the receiver | |
1078 | * due to line noise. | |
1079 | */ | |
1080 | ||
1081 | *ptr++ = 0x70; | |
1082 | ||
1083 | /* | |
1084 | * Encode the packet into printable ascii characters | |
1085 | */ | |
1086 | ||
1087 | for (i = 0; i < len; ++i) { | |
1088 | v = (v << 8) | s[i]; | |
1089 | bits += 8; | |
1090 | while (bits >= 6) { | |
1091 | bits -= 6; | |
1092 | c = 0x30 + ((v >> bits) & 0x3F); | |
1093 | *ptr++ = c; | |
1094 | } | |
1095 | } | |
1096 | if (bits) { | |
1097 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1098 | *ptr++ = c; | |
1099 | } | |
1100 | *ptr++ = 0x70; | |
1101 | return ptr - d; | |
1102 | } | |
1103 | ||
1104 | void | |
1105 | slip_unesc6(struct slip *sl, unsigned char s) | |
1106 | { | |
1107 | unsigned char c; | |
1108 | ||
1109 | if (s == 0x70) { | |
1110 | #ifdef CONFIG_SLIP_SMART | |
1111 | /* drop keeptest bit = VSV */ | |
1112 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1113 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1114 | #endif | |
1115 | ||
1116 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && (sl->rcount > 2)) { | |
1117 | sl_bump(sl); | |
1118 | } | |
1119 | sl->rcount = 0; | |
1120 | sl->xbits = 0; | |
1121 | sl->xdata = 0; | |
1122 | } else if (s >= 0x30 && s < 0x70) { | |
1123 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); | |
1124 | sl->xbits += 6; | |
1125 | if (sl->xbits >= 8) { | |
1126 | sl->xbits -= 8; | |
1127 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1128 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1129 | if (sl->rcount < sl->buffsize) { | |
1130 | sl->rbuff[sl->rcount++] = c; | |
1131 | return; | |
1132 | } | |
1133 | sl->rx_over_errors++; | |
1134 | set_bit(SLF_ERROR, &sl->flags); | |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1140 | ||
1141 | /* Perform I/O control on an active SLIP channel. */ | |
1142 | static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) | |
1143 | { | |
1144 | struct slip *sl = (struct slip *) tty->disc_data; | |
1145 | unsigned int tmp; | |
1146 | int __user *p = (int __user *)arg; | |
1147 | ||
1148 | /* First make sure we're connected. */ | |
1149 | if (!sl || sl->magic != SLIP_MAGIC) { | |
1150 | return -EINVAL; | |
1151 | } | |
1152 | ||
1153 | switch(cmd) { | |
1154 | case SIOCGIFNAME: | |
1155 | tmp = strlen(sl->dev->name) + 1; | |
1156 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1157 | return -EFAULT; | |
1158 | return 0; | |
1159 | ||
1160 | case SIOCGIFENCAP: | |
1161 | if (put_user(sl->mode, p)) | |
1162 | return -EFAULT; | |
1163 | return 0; | |
1164 | ||
1165 | case SIOCSIFENCAP: | |
1166 | if (get_user(tmp, p)) | |
1167 | return -EFAULT; | |
1168 | #ifndef SL_INCLUDE_CSLIP | |
1169 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) { | |
1170 | return -EINVAL; | |
1171 | } | |
1172 | #else | |
1173 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
1174 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
1175 | /* return -EINVAL; */ | |
1176 | tmp &= ~SL_MODE_ADAPTIVE; | |
1177 | } | |
1178 | #endif | |
1179 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
1180 | if (tmp & SL_MODE_SLIP6) { | |
1181 | return -EINVAL; | |
1182 | } | |
1183 | #endif | |
1184 | sl->mode = tmp; | |
1185 | sl->dev->type = ARPHRD_SLIP+sl->mode; | |
1186 | return 0; | |
1187 | ||
1188 | case SIOCSIFHWADDR: | |
1189 | return -EINVAL; | |
1190 | ||
1191 | #ifdef CONFIG_SLIP_SMART | |
1192 | /* VSV changes start here */ | |
1193 | case SIOCSKEEPALIVE: | |
1194 | if (get_user(tmp, p)) | |
1195 | return -EFAULT; | |
1196 | if (tmp > 255) /* max for unchar */ | |
1197 | return -EINVAL; | |
1198 | ||
1199 | spin_lock_bh(&sl->lock); | |
1200 | if (!sl->tty) { | |
1201 | spin_unlock_bh(&sl->lock); | |
1202 | return -ENODEV; | |
1203 | } | |
1204 | if ((sl->keepalive = (unchar) tmp) != 0) { | |
1205 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1206 | set_bit(SLF_KEEPTEST, &sl->flags); | |
1207 | } else { | |
1208 | del_timer (&sl->keepalive_timer); | |
1209 | } | |
1210 | spin_unlock_bh(&sl->lock); | |
1211 | return 0; | |
1212 | ||
1213 | case SIOCGKEEPALIVE: | |
1214 | if (put_user(sl->keepalive, p)) | |
1215 | return -EFAULT; | |
1216 | return 0; | |
1217 | ||
1218 | case SIOCSOUTFILL: | |
1219 | if (get_user(tmp, p)) | |
1220 | return -EFAULT; | |
1221 | if (tmp > 255) /* max for unchar */ | |
1222 | return -EINVAL; | |
1223 | spin_lock_bh(&sl->lock); | |
1224 | if (!sl->tty) { | |
1225 | spin_unlock_bh(&sl->lock); | |
1226 | return -ENODEV; | |
1227 | } | |
1228 | if ((sl->outfill = (unchar) tmp) != 0){ | |
1229 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1230 | set_bit(SLF_OUTWAIT, &sl->flags); | |
1231 | } else { | |
1232 | del_timer (&sl->outfill_timer); | |
1233 | } | |
1234 | spin_unlock_bh(&sl->lock); | |
1235 | return 0; | |
1236 | ||
1237 | case SIOCGOUTFILL: | |
1238 | if (put_user(sl->outfill, p)) | |
1239 | return -EFAULT; | |
1240 | return 0; | |
1241 | /* VSV changes end */ | |
1242 | #endif | |
1243 | ||
1244 | /* Allow stty to read, but not set, the serial port */ | |
1245 | case TCGETS: | |
1246 | case TCGETA: | |
1247 | return n_tty_ioctl(tty, file, cmd, arg); | |
1248 | ||
1249 | default: | |
1250 | return -ENOIOCTLCMD; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | /* VSV changes start here */ | |
1255 | #ifdef CONFIG_SLIP_SMART | |
1256 | /* function do_ioctl called from net/core/dev.c | |
1257 | to allow get/set outfill/keepalive parameter | |
1258 | by ifconfig */ | |
1259 | ||
1260 | static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd) | |
1261 | { | |
1262 | struct slip *sl = netdev_priv(dev); | |
1263 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1264 | ||
1265 | if (sl == NULL) /* Allocation failed ?? */ | |
1266 | return -ENODEV; | |
1267 | ||
1268 | spin_lock_bh(&sl->lock); | |
1269 | ||
1270 | if (!sl->tty) { | |
1271 | spin_unlock_bh(&sl->lock); | |
1272 | return -ENODEV; | |
1273 | } | |
1274 | ||
1275 | switch(cmd){ | |
1276 | case SIOCSKEEPALIVE: | |
1277 | /* max for unchar */ | |
1278 | if ((unsigned)*p > 255) { | |
1279 | spin_unlock_bh(&sl->lock); | |
1280 | return -EINVAL; | |
1281 | } | |
1282 | sl->keepalive = (unchar) *p; | |
1283 | if (sl->keepalive != 0) { | |
1284 | sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ; | |
1285 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1286 | set_bit(SLF_KEEPTEST, &sl->flags); | |
1287 | } else { | |
1288 | del_timer(&sl->keepalive_timer); | |
1289 | } | |
1290 | break; | |
1291 | ||
1292 | case SIOCGKEEPALIVE: | |
1293 | *p = sl->keepalive; | |
1294 | break; | |
1295 | ||
1296 | case SIOCSOUTFILL: | |
1297 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1298 | spin_unlock_bh(&sl->lock); | |
1299 | return -EINVAL; | |
1300 | } | |
1301 | if ((sl->outfill = (unchar)*p) != 0){ | |
1302 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1303 | set_bit(SLF_OUTWAIT, &sl->flags); | |
1304 | } else { | |
1305 | del_timer (&sl->outfill_timer); | |
1306 | } | |
1307 | break; | |
1308 | ||
1309 | case SIOCGOUTFILL: | |
1310 | *p = sl->outfill; | |
1311 | break; | |
1312 | ||
1313 | case SIOCSLEASE: | |
1314 | /* Resolve race condition, when ioctl'ing hanged up | |
1315 | and opened by another process device. | |
1316 | */ | |
1317 | if (sl->tty != current->signal->tty && sl->pid != current->pid) { | |
1318 | spin_unlock_bh(&sl->lock); | |
1319 | return -EPERM; | |
1320 | } | |
1321 | sl->leased = 0; | |
1322 | if (*p) | |
1323 | sl->leased = 1; | |
1324 | break; | |
1325 | ||
1326 | case SIOCGLEASE: | |
1327 | *p = sl->leased; | |
1328 | }; | |
1329 | spin_unlock_bh(&sl->lock); | |
1330 | return 0; | |
1331 | } | |
1332 | #endif | |
1333 | /* VSV changes end */ | |
1334 | ||
1335 | static struct tty_ldisc sl_ldisc = { | |
1336 | .owner = THIS_MODULE, | |
1337 | .magic = TTY_LDISC_MAGIC, | |
1338 | .name = "slip", | |
1339 | .open = slip_open, | |
1340 | .close = slip_close, | |
1341 | .ioctl = slip_ioctl, | |
1342 | .receive_buf = slip_receive_buf, | |
1343 | .receive_room = slip_receive_room, | |
1344 | .write_wakeup = slip_write_wakeup, | |
1345 | }; | |
1346 | ||
1347 | static int __init slip_init(void) | |
1348 | { | |
1349 | int status; | |
1350 | ||
1351 | if (slip_maxdev < 4) | |
1352 | slip_maxdev = 4; /* Sanity */ | |
1353 | ||
1354 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1355 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1356 | " (6 bit encapsulation enabled)" | |
1357 | #endif | |
1358 | ".\n", | |
1359 | SLIP_VERSION, slip_maxdev ); | |
1360 | #if defined(SL_INCLUDE_CSLIP) | |
1361 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1362 | #endif | |
1363 | #ifdef CONFIG_SLIP_SMART | |
1364 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1365 | #endif | |
1366 | ||
1367 | slip_devs = kmalloc(sizeof(struct net_device *)*slip_maxdev, GFP_KERNEL); | |
1368 | if (!slip_devs) { | |
1369 | printk(KERN_ERR "SLIP: Can't allocate slip devices array! Uaargh! (-> No SLIP available)\n"); | |
1370 | return -ENOMEM; | |
1371 | } | |
1372 | ||
1373 | /* Clear the pointer array, we allocate devices when we need them */ | |
1374 | memset(slip_devs, 0, sizeof(struct net_device *)*slip_maxdev); | |
1375 | ||
1376 | /* Fill in our line protocol discipline, and register it */ | |
1377 | if ((status = tty_register_ldisc(N_SLIP, &sl_ldisc)) != 0) { | |
1378 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); | |
1379 | kfree(slip_devs); | |
1380 | } | |
1381 | return status; | |
1382 | } | |
1383 | ||
1384 | static void __exit slip_exit(void) | |
1385 | { | |
1386 | int i; | |
1387 | struct net_device *dev; | |
1388 | struct slip *sl; | |
1389 | unsigned long timeout = jiffies + HZ; | |
1390 | int busy = 0; | |
1391 | ||
1392 | if (slip_devs == NULL) | |
1393 | return; | |
1394 | ||
1395 | /* First of all: check for active disciplines and hangup them. | |
1396 | */ | |
1397 | do { | |
1398 | if (busy) { | |
1399 | set_current_state(TASK_INTERRUPTIBLE); | |
1400 | schedule_timeout(HZ / 10); | |
1401 | } | |
1402 | ||
1403 | busy = 0; | |
1404 | for (i = 0; i < slip_maxdev; i++) { | |
1405 | dev = slip_devs[i]; | |
1406 | if (!dev) | |
1407 | continue; | |
1408 | sl = netdev_priv(dev); | |
1409 | spin_lock_bh(&sl->lock); | |
1410 | if (sl->tty) { | |
1411 | busy++; | |
1412 | tty_hangup(sl->tty); | |
1413 | } | |
1414 | spin_unlock_bh(&sl->lock); | |
1415 | } | |
1416 | } while (busy && time_before(jiffies, timeout)); | |
1417 | ||
1418 | ||
1419 | for (i = 0; i < slip_maxdev; i++) { | |
1420 | dev = slip_devs[i]; | |
1421 | if (!dev) | |
1422 | continue; | |
1423 | slip_devs[i] = NULL; | |
1424 | ||
1425 | sl = netdev_priv(dev); | |
1426 | if (sl->tty) { | |
1427 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1428 | dev->name); | |
1429 | /* Intentionally leak the control block. */ | |
1430 | dev->destructor = NULL; | |
1431 | } | |
1432 | ||
1433 | unregister_netdev(dev); | |
1434 | } | |
1435 | ||
1436 | kfree(slip_devs); | |
1437 | slip_devs = NULL; | |
1438 | ||
1439 | if ((i = tty_register_ldisc(N_SLIP, NULL))) | |
1440 | { | |
1441 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | module_init(slip_init); | |
1446 | module_exit(slip_exit); | |
1447 | ||
1448 | #ifdef CONFIG_SLIP_SMART | |
1449 | /* | |
1450 | * This is start of the code for multislip style line checking | |
1451 | * added by Stanislav Voronyi. All changes before marked VSV | |
1452 | */ | |
1453 | ||
1454 | static void sl_outfill(unsigned long sls) | |
1455 | { | |
1456 | struct slip *sl=(struct slip *)sls; | |
1457 | ||
1458 | spin_lock(&sl->lock); | |
1459 | ||
1460 | if (sl->tty == NULL) | |
1461 | goto out; | |
1462 | ||
1463 | if(sl->outfill) | |
1464 | { | |
1465 | if( test_bit(SLF_OUTWAIT, &sl->flags) ) | |
1466 | { | |
1467 | /* no packets were transmitted, do outfill */ | |
1468 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1469 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1470 | #else | |
1471 | unsigned char s = END; | |
1472 | #endif | |
1473 | /* put END into tty queue. Is it right ??? */ | |
1474 | if (!netif_queue_stopped(sl->dev)) | |
1475 | { | |
1476 | /* if device busy no outfill */ | |
1477 | sl->tty->driver->write(sl->tty, &s, 1); | |
1478 | } | |
1479 | } | |
1480 | else | |
1481 | set_bit(SLF_OUTWAIT, &sl->flags); | |
1482 | ||
1483 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1484 | } | |
1485 | out: | |
1486 | spin_unlock(&sl->lock); | |
1487 | } | |
1488 | ||
1489 | static void sl_keepalive(unsigned long sls) | |
1490 | { | |
1491 | struct slip *sl=(struct slip *)sls; | |
1492 | ||
1493 | spin_lock(&sl->lock); | |
1494 | ||
1495 | if (sl->tty == NULL) | |
1496 | goto out; | |
1497 | ||
1498 | if( sl->keepalive) | |
1499 | { | |
1500 | if(test_bit(SLF_KEEPTEST, &sl->flags)) | |
1501 | { | |
1502 | /* keepalive still high :(, we must hangup */ | |
1503 | if( sl->outfill ) /* outfill timer must be deleted too */ | |
1504 | (void)del_timer(&sl->outfill_timer); | |
1505 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
1506 | tty_hangup(sl->tty); /* this must hangup tty & close slip */ | |
1507 | /* I think we need not something else */ | |
1508 | goto out; | |
1509 | } | |
1510 | else | |
1511 | set_bit(SLF_KEEPTEST, &sl->flags); | |
1512 | ||
1513 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1514 | } | |
1515 | ||
1516 | out: | |
1517 | spin_unlock(&sl->lock); | |
1518 | } | |
1519 | ||
1520 | #endif | |
1521 | MODULE_LICENSE("GPL"); | |
1522 | MODULE_ALIAS_LDISC(N_SLIP); |