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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 | |
158a0e45 | 188 | kfree(cbuff); |
1da177e4 LT |
189 | if (slcomp) |
190 | slhc_free(slcomp); | |
191 | #endif | |
158a0e45 JJ |
192 | kfree(xbuff); |
193 | kfree(rbuff); | |
1da177e4 LT |
194 | return err; |
195 | } | |
196 | ||
197 | /* Free a SLIP channel buffers. */ | |
198 | static void | |
199 | sl_free_bufs(struct slip *sl) | |
200 | { | |
201 | void * tmp; | |
202 | ||
203 | /* Free all SLIP frame buffers. */ | |
158a0e45 JJ |
204 | tmp = xchg(&sl->rbuff, NULL); |
205 | kfree(tmp); | |
206 | tmp = xchg(&sl->xbuff, NULL); | |
207 | kfree(tmp); | |
1da177e4 | 208 | #ifdef SL_INCLUDE_CSLIP |
158a0e45 JJ |
209 | tmp = xchg(&sl->cbuff, NULL); |
210 | kfree(tmp); | |
1da177e4 LT |
211 | if ((tmp = xchg(&sl->slcomp, NULL)) != NULL) |
212 | slhc_free(tmp); | |
213 | #endif | |
214 | } | |
215 | ||
216 | /* | |
217 | Reallocate slip channel buffers. | |
218 | */ | |
219 | ||
220 | static 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 = (unsigned char *) kmalloc (len + 4, GFP_ATOMIC); | |
239 | rbuff = (unsigned char *) kmalloc (len + 4, GFP_ATOMIC); | |
240 | #ifdef SL_INCLUDE_CSLIP | |
241 | cbuff = (unsigned char *) 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 | ||
258 | spin_lock_bh(&sl->lock); | |
259 | ||
260 | err = -ENODEV; | |
261 | if (sl->tty == NULL) | |
262 | goto done_on_bh; | |
263 | ||
264 | xbuff = xchg(&sl->xbuff, xbuff); | |
265 | rbuff = xchg(&sl->rbuff, rbuff); | |
266 | #ifdef SL_INCLUDE_CSLIP | |
267 | cbuff = xchg(&sl->cbuff, cbuff); | |
268 | #endif | |
269 | if (sl->xleft) { | |
270 | if (sl->xleft <= len) { | |
271 | memcpy(sl->xbuff, sl->xhead, sl->xleft); | |
272 | } else { | |
273 | sl->xleft = 0; | |
274 | sl->tx_dropped++; | |
275 | } | |
276 | } | |
277 | sl->xhead = sl->xbuff; | |
278 | ||
279 | if (sl->rcount) { | |
280 | if (sl->rcount <= len) { | |
281 | memcpy(sl->rbuff, rbuff, sl->rcount); | |
282 | } else { | |
283 | sl->rcount = 0; | |
284 | sl->rx_over_errors++; | |
285 | set_bit(SLF_ERROR, &sl->flags); | |
286 | } | |
287 | } | |
288 | sl->mtu = mtu; | |
289 | dev->mtu = mtu; | |
290 | sl->buffsize = len; | |
291 | err = 0; | |
292 | ||
293 | done_on_bh: | |
294 | spin_unlock_bh(&sl->lock); | |
295 | ||
296 | done: | |
158a0e45 JJ |
297 | kfree(xbuff); |
298 | kfree(rbuff); | |
1da177e4 | 299 | #ifdef SL_INCLUDE_CSLIP |
158a0e45 | 300 | kfree(cbuff); |
1da177e4 LT |
301 | #endif |
302 | return err; | |
303 | } | |
304 | ||
305 | ||
306 | /* Set the "sending" flag. This must be atomic hence the set_bit. */ | |
307 | static inline void | |
308 | sl_lock(struct slip *sl) | |
309 | { | |
310 | netif_stop_queue(sl->dev); | |
311 | } | |
312 | ||
313 | ||
314 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ | |
315 | static inline void | |
316 | sl_unlock(struct slip *sl) | |
317 | { | |
318 | netif_wake_queue(sl->dev); | |
319 | } | |
320 | ||
321 | /* Send one completely decapsulated IP datagram to the IP layer. */ | |
322 | static void | |
323 | sl_bump(struct slip *sl) | |
324 | { | |
325 | struct sk_buff *skb; | |
326 | int count; | |
327 | ||
328 | count = sl->rcount; | |
329 | #ifdef SL_INCLUDE_CSLIP | |
330 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
331 | unsigned char c; | |
332 | if ((c = sl->rbuff[0]) & SL_TYPE_COMPRESSED_TCP) { | |
333 | /* ignore compressed packets when CSLIP is off */ | |
334 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
335 | printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name); | |
336 | return; | |
337 | } | |
338 | /* make sure we've reserved enough space for uncompress to use */ | |
339 | if (count + 80 > sl->buffsize) { | |
340 | sl->rx_over_errors++; | |
341 | return; | |
342 | } | |
343 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
344 | if (count <= 0) { | |
345 | return; | |
346 | } | |
347 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { | |
348 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
349 | /* turn on header compression */ | |
350 | sl->mode |= SL_MODE_CSLIP; | |
351 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
352 | printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name); | |
353 | } | |
354 | sl->rbuff[0] &= 0x4f; | |
355 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) { | |
356 | return; | |
357 | } | |
358 | } | |
359 | } | |
360 | #endif /* SL_INCLUDE_CSLIP */ | |
361 | ||
362 | sl->rx_bytes+=count; | |
363 | ||
364 | skb = dev_alloc_skb(count); | |
365 | if (skb == NULL) { | |
366 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name); | |
367 | sl->rx_dropped++; | |
368 | return; | |
369 | } | |
370 | skb->dev = sl->dev; | |
371 | memcpy(skb_put(skb,count), sl->rbuff, count); | |
372 | skb->mac.raw=skb->data; | |
373 | skb->protocol=htons(ETH_P_IP); | |
374 | netif_rx(skb); | |
375 | sl->dev->last_rx = jiffies; | |
376 | sl->rx_packets++; | |
377 | } | |
378 | ||
379 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
380 | static void | |
381 | sl_encaps(struct slip *sl, unsigned char *icp, int len) | |
382 | { | |
383 | unsigned char *p; | |
384 | int actual, count; | |
385 | ||
386 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
387 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
388 | sl->tx_dropped++; | |
389 | sl_unlock(sl); | |
390 | return; | |
391 | } | |
392 | ||
393 | p = icp; | |
394 | #ifdef SL_INCLUDE_CSLIP | |
395 | if (sl->mode & SL_MODE_CSLIP) { | |
396 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); | |
397 | } | |
398 | #endif | |
399 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
400 | if(sl->mode & SL_MODE_SLIP6) | |
401 | count = slip_esc6(p, (unsigned char *) sl->xbuff, len); | |
402 | else | |
403 | #endif | |
404 | count = slip_esc(p, (unsigned char *) sl->xbuff, len); | |
405 | ||
406 | /* Order of next two lines is *very* important. | |
407 | * When we are sending a little amount of data, | |
408 | * the transfer may be completed inside driver.write() | |
409 | * routine, because it's running with interrupts enabled. | |
410 | * In this case we *never* got WRITE_WAKEUP event, | |
411 | * if we did not request it before write operation. | |
412 | * 14 Oct 1994 Dmitry Gorodchanin. | |
413 | */ | |
414 | sl->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); | |
415 | actual = sl->tty->driver->write(sl->tty, sl->xbuff, count); | |
416 | #ifdef SL_CHECK_TRANSMIT | |
417 | sl->dev->trans_start = jiffies; | |
418 | #endif | |
419 | sl->xleft = count - actual; | |
420 | sl->xhead = sl->xbuff + actual; | |
421 | #ifdef CONFIG_SLIP_SMART | |
422 | /* VSV */ | |
423 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
424 | #endif | |
425 | } | |
426 | ||
427 | /* | |
428 | * Called by the driver when there's room for more data. If we have | |
429 | * more packets to send, we send them here. | |
430 | */ | |
431 | static void slip_write_wakeup(struct tty_struct *tty) | |
432 | { | |
433 | int actual; | |
434 | struct slip *sl = (struct slip *) tty->disc_data; | |
435 | ||
436 | /* First make sure we're connected. */ | |
437 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) { | |
438 | return; | |
439 | } | |
440 | if (sl->xleft <= 0) { | |
441 | /* Now serial buffer is almost free & we can start | |
442 | * transmission of another packet */ | |
443 | sl->tx_packets++; | |
444 | tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
445 | sl_unlock(sl); | |
446 | return; | |
447 | } | |
448 | ||
449 | actual = tty->driver->write(tty, sl->xhead, sl->xleft); | |
450 | sl->xleft -= actual; | |
451 | sl->xhead += actual; | |
452 | } | |
453 | ||
454 | static void sl_tx_timeout(struct net_device *dev) | |
455 | { | |
456 | struct slip *sl = netdev_priv(dev); | |
457 | ||
458 | spin_lock(&sl->lock); | |
459 | ||
460 | if (netif_queue_stopped(dev)) { | |
461 | if (!netif_running(dev)) | |
462 | goto out; | |
463 | ||
464 | /* May be we must check transmitter timeout here ? | |
465 | * 14 Oct 1994 Dmitry Gorodchanin. | |
466 | */ | |
467 | #ifdef SL_CHECK_TRANSMIT | |
468 | if (time_before(jiffies, dev->trans_start + 20 * HZ)) { | |
469 | /* 20 sec timeout not reached */ | |
470 | goto out; | |
471 | } | |
472 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, | |
473 | (sl->tty->driver->chars_in_buffer(sl->tty) || sl->xleft) ? | |
474 | "bad line quality" : "driver error"); | |
475 | sl->xleft = 0; | |
476 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
477 | sl_unlock(sl); | |
478 | #endif | |
479 | } | |
480 | ||
481 | out: | |
482 | spin_unlock(&sl->lock); | |
483 | } | |
484 | ||
485 | ||
486 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
487 | static int | |
488 | sl_xmit(struct sk_buff *skb, struct net_device *dev) | |
489 | { | |
490 | struct slip *sl = netdev_priv(dev); | |
491 | ||
492 | spin_lock(&sl->lock); | |
493 | if (!netif_running(dev)) { | |
494 | spin_unlock(&sl->lock); | |
495 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
496 | dev_kfree_skb(skb); | |
497 | return 0; | |
498 | } | |
499 | if (sl->tty == NULL) { | |
500 | spin_unlock(&sl->lock); | |
501 | dev_kfree_skb(skb); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | sl_lock(sl); | |
506 | sl->tx_bytes+=skb->len; | |
507 | sl_encaps(sl, skb->data, skb->len); | |
508 | spin_unlock(&sl->lock); | |
509 | ||
510 | dev_kfree_skb(skb); | |
511 | return 0; | |
512 | } | |
513 | ||
514 | ||
515 | /****************************************** | |
516 | * Routines looking at netdevice side. | |
517 | ******************************************/ | |
518 | ||
519 | /* Netdevice UP -> DOWN routine */ | |
520 | ||
521 | static int | |
522 | sl_close(struct net_device *dev) | |
523 | { | |
524 | struct slip *sl = netdev_priv(dev); | |
525 | ||
526 | spin_lock_bh(&sl->lock); | |
527 | if (sl->tty) { | |
528 | /* TTY discipline is running. */ | |
529 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
530 | } | |
531 | netif_stop_queue(dev); | |
532 | sl->rcount = 0; | |
533 | sl->xleft = 0; | |
534 | spin_unlock_bh(&sl->lock); | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | /* Netdevice DOWN -> UP routine */ | |
540 | ||
541 | static int sl_open(struct net_device *dev) | |
542 | { | |
543 | struct slip *sl = netdev_priv(dev); | |
544 | ||
545 | if (sl->tty==NULL) | |
546 | return -ENODEV; | |
547 | ||
548 | sl->flags &= (1 << SLF_INUSE); | |
549 | netif_start_queue(dev); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | /* Netdevice change MTU request */ | |
554 | ||
555 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
556 | { | |
557 | struct slip *sl = netdev_priv(dev); | |
558 | ||
559 | if (new_mtu < 68 || new_mtu > 65534) | |
560 | return -EINVAL; | |
561 | ||
562 | if (new_mtu != dev->mtu) | |
563 | return sl_realloc_bufs(sl, new_mtu); | |
564 | return 0; | |
565 | } | |
566 | ||
567 | /* Netdevice get statistics request */ | |
568 | ||
569 | static struct net_device_stats * | |
570 | sl_get_stats(struct net_device *dev) | |
571 | { | |
572 | static struct net_device_stats stats; | |
573 | struct slip *sl = netdev_priv(dev); | |
574 | #ifdef SL_INCLUDE_CSLIP | |
575 | struct slcompress *comp; | |
576 | #endif | |
577 | ||
578 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
579 | ||
580 | stats.rx_packets = sl->rx_packets; | |
581 | stats.tx_packets = sl->tx_packets; | |
582 | stats.rx_bytes = sl->rx_bytes; | |
583 | stats.tx_bytes = sl->tx_bytes; | |
584 | stats.rx_dropped = sl->rx_dropped; | |
585 | stats.tx_dropped = sl->tx_dropped; | |
586 | stats.tx_errors = sl->tx_errors; | |
587 | stats.rx_errors = sl->rx_errors; | |
588 | stats.rx_over_errors = sl->rx_over_errors; | |
589 | #ifdef SL_INCLUDE_CSLIP | |
590 | stats.rx_fifo_errors = sl->rx_compressed; | |
591 | stats.tx_fifo_errors = sl->tx_compressed; | |
592 | stats.collisions = sl->tx_misses; | |
593 | comp = sl->slcomp; | |
594 | if (comp) { | |
595 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
596 | stats.rx_dropped += comp->sls_i_tossed; | |
597 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
598 | stats.collisions += comp->sls_o_misses; | |
599 | } | |
600 | #endif /* CONFIG_INET */ | |
601 | return (&stats); | |
602 | } | |
603 | ||
604 | /* Netdevice register callback */ | |
605 | ||
606 | static int sl_init(struct net_device *dev) | |
607 | { | |
608 | struct slip *sl = netdev_priv(dev); | |
609 | ||
610 | /* | |
611 | * Finish setting up the DEVICE info. | |
612 | */ | |
613 | ||
614 | dev->mtu = sl->mtu; | |
615 | dev->type = ARPHRD_SLIP + sl->mode; | |
616 | #ifdef SL_CHECK_TRANSMIT | |
617 | dev->tx_timeout = sl_tx_timeout; | |
618 | dev->watchdog_timeo = 20*HZ; | |
619 | #endif | |
620 | return 0; | |
621 | } | |
622 | ||
623 | ||
624 | static void sl_uninit(struct net_device *dev) | |
625 | { | |
626 | struct slip *sl = netdev_priv(dev); | |
627 | ||
628 | sl_free_bufs(sl); | |
629 | } | |
630 | ||
631 | static void sl_setup(struct net_device *dev) | |
632 | { | |
633 | dev->init = sl_init; | |
634 | dev->uninit = sl_uninit; | |
635 | dev->open = sl_open; | |
636 | dev->destructor = free_netdev; | |
637 | dev->stop = sl_close; | |
638 | dev->get_stats = sl_get_stats; | |
639 | dev->change_mtu = sl_change_mtu; | |
640 | dev->hard_start_xmit = sl_xmit; | |
641 | #ifdef CONFIG_SLIP_SMART | |
642 | dev->do_ioctl = sl_ioctl; | |
643 | #endif | |
644 | dev->hard_header_len = 0; | |
645 | dev->addr_len = 0; | |
646 | dev->tx_queue_len = 10; | |
647 | ||
648 | SET_MODULE_OWNER(dev); | |
649 | ||
650 | /* New-style flags. */ | |
651 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
652 | } | |
653 | ||
654 | /****************************************** | |
655 | Routines looking at TTY side. | |
656 | ******************************************/ | |
657 | ||
658 | ||
659 | static int slip_receive_room(struct tty_struct *tty) | |
660 | { | |
661 | return 65536; /* We can handle an infinite amount of data. :-) */ | |
662 | } | |
663 | ||
664 | /* | |
665 | * Handle the 'receiver data ready' interrupt. | |
666 | * This function is called by the 'tty_io' module in the kernel when | |
667 | * a block of SLIP data has been received, which can now be decapsulated | |
668 | * and sent on to some IP layer for further processing. This will not | |
669 | * be re-entered while running but other ldisc functions may be called | |
670 | * in parallel | |
671 | */ | |
672 | ||
673 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) | |
674 | { | |
675 | struct slip *sl = (struct slip *) tty->disc_data; | |
676 | ||
677 | if (!sl || sl->magic != SLIP_MAGIC || | |
678 | !netif_running(sl->dev)) | |
679 | return; | |
680 | ||
681 | /* Read the characters out of the buffer */ | |
682 | while (count--) { | |
683 | if (fp && *fp++) { | |
684 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) { | |
685 | sl->rx_errors++; | |
686 | } | |
687 | cp++; | |
688 | continue; | |
689 | } | |
690 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
691 | if (sl->mode & SL_MODE_SLIP6) | |
692 | slip_unesc6(sl, *cp++); | |
693 | else | |
694 | #endif | |
695 | slip_unesc(sl, *cp++); | |
696 | } | |
697 | } | |
698 | ||
699 | /************************************ | |
700 | * slip_open helper routines. | |
701 | ************************************/ | |
702 | ||
703 | /* Collect hanged up channels */ | |
704 | ||
705 | static void sl_sync(void) | |
706 | { | |
707 | int i; | |
708 | struct net_device *dev; | |
709 | struct slip *sl; | |
710 | ||
711 | for (i = 0; i < slip_maxdev; i++) { | |
712 | if ((dev = slip_devs[i]) == NULL) | |
713 | break; | |
714 | ||
715 | sl = netdev_priv(dev); | |
716 | if (sl->tty || sl->leased) | |
717 | continue; | |
718 | if (dev->flags&IFF_UP) | |
719 | dev_close(dev); | |
720 | } | |
721 | } | |
722 | ||
723 | ||
724 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
725 | static struct slip * | |
726 | sl_alloc(dev_t line) | |
727 | { | |
728 | int i; | |
729 | int sel = -1; | |
730 | int score = -1; | |
731 | struct net_device *dev = NULL; | |
732 | struct slip *sl; | |
733 | ||
734 | if (slip_devs == NULL) | |
735 | return NULL; /* Master array missing ! */ | |
736 | ||
737 | for (i = 0; i < slip_maxdev; i++) { | |
738 | dev = slip_devs[i]; | |
739 | if (dev == NULL) | |
740 | break; | |
741 | ||
742 | sl = netdev_priv(dev); | |
743 | if (sl->leased) { | |
744 | if (sl->line != line) | |
745 | continue; | |
746 | if (sl->tty) | |
747 | return NULL; | |
748 | ||
749 | /* Clear ESCAPE & ERROR flags */ | |
750 | sl->flags &= (1 << SLF_INUSE); | |
751 | return sl; | |
752 | } | |
753 | ||
754 | if (sl->tty) | |
755 | continue; | |
756 | ||
757 | if (current->pid == sl->pid) { | |
758 | if (sl->line == line && score < 3) { | |
759 | sel = i; | |
760 | score = 3; | |
761 | continue; | |
762 | } | |
763 | if (score < 2) { | |
764 | sel = i; | |
765 | score = 2; | |
766 | } | |
767 | continue; | |
768 | } | |
769 | if (sl->line == line && score < 1) { | |
770 | sel = i; | |
771 | score = 1; | |
772 | continue; | |
773 | } | |
774 | if (score < 0) { | |
775 | sel = i; | |
776 | score = 0; | |
777 | } | |
778 | } | |
779 | ||
780 | if (sel >= 0) { | |
781 | i = sel; | |
782 | dev = slip_devs[i]; | |
783 | if (score > 1) { | |
784 | sl = netdev_priv(dev); | |
785 | sl->flags &= (1 << SLF_INUSE); | |
786 | return sl; | |
787 | } | |
788 | } | |
789 | ||
790 | /* Sorry, too many, all slots in use */ | |
791 | if (i >= slip_maxdev) | |
792 | return NULL; | |
793 | ||
794 | if (dev) { | |
795 | sl = netdev_priv(dev); | |
796 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
797 | unregister_netdevice(dev); | |
798 | dev = NULL; | |
799 | slip_devs[i] = NULL; | |
800 | } | |
801 | } | |
802 | ||
803 | if (!dev) { | |
804 | char name[IFNAMSIZ]; | |
805 | sprintf(name, "sl%d", i); | |
806 | ||
807 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
808 | if (!dev) | |
809 | return NULL; | |
810 | dev->base_addr = i; | |
811 | } | |
812 | ||
813 | sl = netdev_priv(dev); | |
814 | ||
815 | /* Initialize channel control data */ | |
816 | sl->magic = SLIP_MAGIC; | |
817 | sl->dev = dev; | |
818 | spin_lock_init(&sl->lock); | |
819 | sl->mode = SL_MODE_DEFAULT; | |
820 | #ifdef CONFIG_SLIP_SMART | |
821 | init_timer(&sl->keepalive_timer); /* initialize timer_list struct */ | |
822 | sl->keepalive_timer.data=(unsigned long)sl; | |
823 | sl->keepalive_timer.function=sl_keepalive; | |
824 | init_timer(&sl->outfill_timer); | |
825 | sl->outfill_timer.data=(unsigned long)sl; | |
826 | sl->outfill_timer.function=sl_outfill; | |
827 | #endif | |
828 | slip_devs[i] = dev; | |
829 | ||
830 | return sl; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Open the high-level part of the SLIP channel. | |
835 | * This function is called by the TTY module when the | |
836 | * SLIP line discipline is called for. Because we are | |
837 | * sure the tty line exists, we only have to link it to | |
838 | * a free SLIP channel... | |
839 | * | |
840 | * Called in process context serialized from other ldisc calls. | |
841 | */ | |
842 | ||
843 | static int slip_open(struct tty_struct *tty) | |
844 | { | |
845 | struct slip *sl; | |
846 | int err; | |
847 | ||
848 | if(!capable(CAP_NET_ADMIN)) | |
849 | return -EPERM; | |
850 | ||
851 | /* RTnetlink lock is misused here to serialize concurrent | |
852 | opens of slip channels. There are better ways, but it is | |
853 | the simplest one. | |
854 | */ | |
855 | rtnl_lock(); | |
856 | ||
857 | /* Collect hanged up channels. */ | |
858 | sl_sync(); | |
859 | ||
860 | sl = (struct slip *) tty->disc_data; | |
861 | ||
862 | err = -EEXIST; | |
863 | /* First make sure we're not already connected. */ | |
864 | if (sl && sl->magic == SLIP_MAGIC) | |
865 | goto err_exit; | |
866 | ||
867 | /* OK. Find a free SLIP channel to use. */ | |
868 | err = -ENFILE; | |
869 | if ((sl = sl_alloc(tty_devnum(tty))) == NULL) | |
870 | goto err_exit; | |
871 | ||
872 | sl->tty = tty; | |
873 | tty->disc_data = sl; | |
874 | sl->line = tty_devnum(tty); | |
875 | sl->pid = current->pid; | |
876 | ||
877 | /* FIXME: already done before we were called - seems this can go */ | |
878 | if (tty->driver->flush_buffer) | |
879 | tty->driver->flush_buffer(tty); | |
880 | ||
881 | if (!test_bit(SLF_INUSE, &sl->flags)) { | |
882 | /* Perform the low-level SLIP initialization. */ | |
883 | if ((err = sl_alloc_bufs(sl, SL_MTU)) != 0) | |
884 | goto err_free_chan; | |
885 | ||
886 | set_bit(SLF_INUSE, &sl->flags); | |
887 | ||
888 | if ((err = register_netdevice(sl->dev))) | |
889 | goto err_free_bufs; | |
890 | } | |
891 | ||
892 | #ifdef CONFIG_SLIP_SMART | |
893 | if (sl->keepalive) { | |
894 | sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ; | |
895 | add_timer (&sl->keepalive_timer); | |
896 | } | |
897 | if (sl->outfill) { | |
898 | sl->outfill_timer.expires=jiffies+sl->outfill*HZ; | |
899 | add_timer (&sl->outfill_timer); | |
900 | } | |
901 | #endif | |
902 | ||
903 | /* Done. We have linked the TTY line to a channel. */ | |
904 | rtnl_unlock(); | |
905 | return sl->dev->base_addr; | |
906 | ||
907 | err_free_bufs: | |
908 | sl_free_bufs(sl); | |
909 | ||
910 | err_free_chan: | |
911 | sl->tty = NULL; | |
912 | tty->disc_data = NULL; | |
913 | clear_bit(SLF_INUSE, &sl->flags); | |
914 | ||
915 | err_exit: | |
916 | rtnl_unlock(); | |
917 | ||
918 | /* Count references from TTY module */ | |
919 | return err; | |
920 | } | |
921 | ||
922 | /* | |
923 | ||
924 | FIXME: 1,2 are fixed 3 was never true anyway. | |
925 | ||
926 | Let me to blame a bit. | |
927 | 1. TTY module calls this funstion on soft interrupt. | |
928 | 2. TTY module calls this function WITH MASKED INTERRUPTS! | |
929 | 3. TTY module does not notify us about line discipline | |
930 | shutdown, | |
931 | ||
932 | Seems, now it is clean. The solution is to consider netdevice and | |
933 | line discipline sides as two independent threads. | |
934 | ||
935 | By-product (not desired): sl? does not feel hangups and remains open. | |
936 | It is supposed, that user level program (dip, diald, slattach...) | |
937 | will catch SIGHUP and make the rest of work. | |
938 | ||
939 | I see no way to make more with current tty code. --ANK | |
940 | */ | |
941 | ||
942 | /* | |
943 | * Close down a SLIP channel. | |
944 | * This means flushing out any pending queues, and then returning. This | |
945 | * call is serialized against other ldisc functions. | |
946 | */ | |
947 | static void | |
948 | slip_close(struct tty_struct *tty) | |
949 | { | |
950 | struct slip *sl = (struct slip *) tty->disc_data; | |
951 | ||
952 | /* First make sure we're connected. */ | |
953 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
954 | return; | |
955 | ||
956 | tty->disc_data = NULL; | |
957 | sl->tty = NULL; | |
958 | if (!sl->leased) | |
959 | sl->line = 0; | |
960 | ||
961 | /* VSV = very important to remove timers */ | |
962 | #ifdef CONFIG_SLIP_SMART | |
963 | del_timer_sync(&sl->keepalive_timer); | |
964 | del_timer_sync(&sl->outfill_timer); | |
965 | #endif | |
966 | ||
967 | /* Count references from TTY module */ | |
968 | } | |
969 | ||
970 | /************************************************************************ | |
971 | * STANDARD SLIP ENCAPSULATION * | |
972 | ************************************************************************/ | |
973 | ||
974 | int | |
975 | slip_esc(unsigned char *s, unsigned char *d, int len) | |
976 | { | |
977 | unsigned char *ptr = d; | |
978 | unsigned char c; | |
979 | ||
980 | /* | |
981 | * Send an initial END character to flush out any | |
982 | * data that may have accumulated in the receiver | |
983 | * due to line noise. | |
984 | */ | |
985 | ||
986 | *ptr++ = END; | |
987 | ||
988 | /* | |
989 | * For each byte in the packet, send the appropriate | |
990 | * character sequence, according to the SLIP protocol. | |
991 | */ | |
992 | ||
993 | while (len-- > 0) { | |
994 | switch(c = *s++) { | |
995 | case END: | |
996 | *ptr++ = ESC; | |
997 | *ptr++ = ESC_END; | |
998 | break; | |
999 | case ESC: | |
1000 | *ptr++ = ESC; | |
1001 | *ptr++ = ESC_ESC; | |
1002 | break; | |
1003 | default: | |
1004 | *ptr++ = c; | |
1005 | break; | |
1006 | } | |
1007 | } | |
1008 | *ptr++ = END; | |
1009 | return (ptr - d); | |
1010 | } | |
1011 | ||
1012 | static void slip_unesc(struct slip *sl, unsigned char s) | |
1013 | { | |
1014 | ||
1015 | switch(s) { | |
1016 | case END: | |
1017 | #ifdef CONFIG_SLIP_SMART | |
1018 | /* drop keeptest bit = VSV */ | |
1019 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1020 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1021 | #endif | |
1022 | ||
1023 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && (sl->rcount > 2)) { | |
1024 | sl_bump(sl); | |
1025 | } | |
1026 | clear_bit(SLF_ESCAPE, &sl->flags); | |
1027 | sl->rcount = 0; | |
1028 | return; | |
1029 | ||
1030 | case ESC: | |
1031 | set_bit(SLF_ESCAPE, &sl->flags); | |
1032 | return; | |
1033 | case ESC_ESC: | |
1034 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) { | |
1035 | s = ESC; | |
1036 | } | |
1037 | break; | |
1038 | case ESC_END: | |
1039 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) { | |
1040 | s = END; | |
1041 | } | |
1042 | break; | |
1043 | } | |
1044 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1045 | if (sl->rcount < sl->buffsize) { | |
1046 | sl->rbuff[sl->rcount++] = s; | |
1047 | return; | |
1048 | } | |
1049 | sl->rx_over_errors++; | |
1050 | set_bit(SLF_ERROR, &sl->flags); | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | ||
1055 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1056 | /************************************************************************ | |
1057 | * 6 BIT SLIP ENCAPSULATION * | |
1058 | ************************************************************************/ | |
1059 | ||
1060 | int | |
1061 | slip_esc6(unsigned char *s, unsigned char *d, int len) | |
1062 | { | |
1063 | unsigned char *ptr = d; | |
1064 | unsigned char c; | |
1065 | int i; | |
1066 | unsigned short v = 0; | |
1067 | short bits = 0; | |
1068 | ||
1069 | /* | |
1070 | * Send an initial END character to flush out any | |
1071 | * data that may have accumulated in the receiver | |
1072 | * due to line noise. | |
1073 | */ | |
1074 | ||
1075 | *ptr++ = 0x70; | |
1076 | ||
1077 | /* | |
1078 | * Encode the packet into printable ascii characters | |
1079 | */ | |
1080 | ||
1081 | for (i = 0; i < len; ++i) { | |
1082 | v = (v << 8) | s[i]; | |
1083 | bits += 8; | |
1084 | while (bits >= 6) { | |
1085 | bits -= 6; | |
1086 | c = 0x30 + ((v >> bits) & 0x3F); | |
1087 | *ptr++ = c; | |
1088 | } | |
1089 | } | |
1090 | if (bits) { | |
1091 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1092 | *ptr++ = c; | |
1093 | } | |
1094 | *ptr++ = 0x70; | |
1095 | return ptr - d; | |
1096 | } | |
1097 | ||
1098 | void | |
1099 | slip_unesc6(struct slip *sl, unsigned char s) | |
1100 | { | |
1101 | unsigned char c; | |
1102 | ||
1103 | if (s == 0x70) { | |
1104 | #ifdef CONFIG_SLIP_SMART | |
1105 | /* drop keeptest bit = VSV */ | |
1106 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1107 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1108 | #endif | |
1109 | ||
1110 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && (sl->rcount > 2)) { | |
1111 | sl_bump(sl); | |
1112 | } | |
1113 | sl->rcount = 0; | |
1114 | sl->xbits = 0; | |
1115 | sl->xdata = 0; | |
1116 | } else if (s >= 0x30 && s < 0x70) { | |
1117 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); | |
1118 | sl->xbits += 6; | |
1119 | if (sl->xbits >= 8) { | |
1120 | sl->xbits -= 8; | |
1121 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1122 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1123 | if (sl->rcount < sl->buffsize) { | |
1124 | sl->rbuff[sl->rcount++] = c; | |
1125 | return; | |
1126 | } | |
1127 | sl->rx_over_errors++; | |
1128 | set_bit(SLF_ERROR, &sl->flags); | |
1129 | } | |
1130 | } | |
1131 | } | |
1132 | } | |
1133 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1134 | ||
1135 | /* Perform I/O control on an active SLIP channel. */ | |
1136 | static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) | |
1137 | { | |
1138 | struct slip *sl = (struct slip *) tty->disc_data; | |
1139 | unsigned int tmp; | |
1140 | int __user *p = (int __user *)arg; | |
1141 | ||
1142 | /* First make sure we're connected. */ | |
1143 | if (!sl || sl->magic != SLIP_MAGIC) { | |
1144 | return -EINVAL; | |
1145 | } | |
1146 | ||
1147 | switch(cmd) { | |
1148 | case SIOCGIFNAME: | |
1149 | tmp = strlen(sl->dev->name) + 1; | |
1150 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1151 | return -EFAULT; | |
1152 | return 0; | |
1153 | ||
1154 | case SIOCGIFENCAP: | |
1155 | if (put_user(sl->mode, p)) | |
1156 | return -EFAULT; | |
1157 | return 0; | |
1158 | ||
1159 | case SIOCSIFENCAP: | |
1160 | if (get_user(tmp, p)) | |
1161 | return -EFAULT; | |
1162 | #ifndef SL_INCLUDE_CSLIP | |
1163 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) { | |
1164 | return -EINVAL; | |
1165 | } | |
1166 | #else | |
1167 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
1168 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
1169 | /* return -EINVAL; */ | |
1170 | tmp &= ~SL_MODE_ADAPTIVE; | |
1171 | } | |
1172 | #endif | |
1173 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
1174 | if (tmp & SL_MODE_SLIP6) { | |
1175 | return -EINVAL; | |
1176 | } | |
1177 | #endif | |
1178 | sl->mode = tmp; | |
1179 | sl->dev->type = ARPHRD_SLIP+sl->mode; | |
1180 | return 0; | |
1181 | ||
1182 | case SIOCSIFHWADDR: | |
1183 | return -EINVAL; | |
1184 | ||
1185 | #ifdef CONFIG_SLIP_SMART | |
1186 | /* VSV changes start here */ | |
1187 | case SIOCSKEEPALIVE: | |
1188 | if (get_user(tmp, p)) | |
1189 | return -EFAULT; | |
1190 | if (tmp > 255) /* max for unchar */ | |
1191 | return -EINVAL; | |
1192 | ||
1193 | spin_lock_bh(&sl->lock); | |
1194 | if (!sl->tty) { | |
1195 | spin_unlock_bh(&sl->lock); | |
1196 | return -ENODEV; | |
1197 | } | |
1198 | if ((sl->keepalive = (unchar) tmp) != 0) { | |
1199 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1200 | set_bit(SLF_KEEPTEST, &sl->flags); | |
1201 | } else { | |
1202 | del_timer (&sl->keepalive_timer); | |
1203 | } | |
1204 | spin_unlock_bh(&sl->lock); | |
1205 | return 0; | |
1206 | ||
1207 | case SIOCGKEEPALIVE: | |
1208 | if (put_user(sl->keepalive, p)) | |
1209 | return -EFAULT; | |
1210 | return 0; | |
1211 | ||
1212 | case SIOCSOUTFILL: | |
1213 | if (get_user(tmp, p)) | |
1214 | return -EFAULT; | |
1215 | if (tmp > 255) /* max for unchar */ | |
1216 | return -EINVAL; | |
1217 | spin_lock_bh(&sl->lock); | |
1218 | if (!sl->tty) { | |
1219 | spin_unlock_bh(&sl->lock); | |
1220 | return -ENODEV; | |
1221 | } | |
1222 | if ((sl->outfill = (unchar) tmp) != 0){ | |
1223 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1224 | set_bit(SLF_OUTWAIT, &sl->flags); | |
1225 | } else { | |
1226 | del_timer (&sl->outfill_timer); | |
1227 | } | |
1228 | spin_unlock_bh(&sl->lock); | |
1229 | return 0; | |
1230 | ||
1231 | case SIOCGOUTFILL: | |
1232 | if (put_user(sl->outfill, p)) | |
1233 | return -EFAULT; | |
1234 | return 0; | |
1235 | /* VSV changes end */ | |
1236 | #endif | |
1237 | ||
1238 | /* Allow stty to read, but not set, the serial port */ | |
1239 | case TCGETS: | |
1240 | case TCGETA: | |
1241 | return n_tty_ioctl(tty, file, cmd, arg); | |
1242 | ||
1243 | default: | |
1244 | return -ENOIOCTLCMD; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | /* VSV changes start here */ | |
1249 | #ifdef CONFIG_SLIP_SMART | |
1250 | /* function do_ioctl called from net/core/dev.c | |
1251 | to allow get/set outfill/keepalive parameter | |
1252 | by ifconfig */ | |
1253 | ||
1254 | static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd) | |
1255 | { | |
1256 | struct slip *sl = netdev_priv(dev); | |
1257 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1258 | ||
1259 | if (sl == NULL) /* Allocation failed ?? */ | |
1260 | return -ENODEV; | |
1261 | ||
1262 | spin_lock_bh(&sl->lock); | |
1263 | ||
1264 | if (!sl->tty) { | |
1265 | spin_unlock_bh(&sl->lock); | |
1266 | return -ENODEV; | |
1267 | } | |
1268 | ||
1269 | switch(cmd){ | |
1270 | case SIOCSKEEPALIVE: | |
1271 | /* max for unchar */ | |
1272 | if ((unsigned)*p > 255) { | |
1273 | spin_unlock_bh(&sl->lock); | |
1274 | return -EINVAL; | |
1275 | } | |
1276 | sl->keepalive = (unchar) *p; | |
1277 | if (sl->keepalive != 0) { | |
1278 | sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ; | |
1279 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1280 | set_bit(SLF_KEEPTEST, &sl->flags); | |
1281 | } else { | |
1282 | del_timer(&sl->keepalive_timer); | |
1283 | } | |
1284 | break; | |
1285 | ||
1286 | case SIOCGKEEPALIVE: | |
1287 | *p = sl->keepalive; | |
1288 | break; | |
1289 | ||
1290 | case SIOCSOUTFILL: | |
1291 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1292 | spin_unlock_bh(&sl->lock); | |
1293 | return -EINVAL; | |
1294 | } | |
1295 | if ((sl->outfill = (unchar)*p) != 0){ | |
1296 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1297 | set_bit(SLF_OUTWAIT, &sl->flags); | |
1298 | } else { | |
1299 | del_timer (&sl->outfill_timer); | |
1300 | } | |
1301 | break; | |
1302 | ||
1303 | case SIOCGOUTFILL: | |
1304 | *p = sl->outfill; | |
1305 | break; | |
1306 | ||
1307 | case SIOCSLEASE: | |
1308 | /* Resolve race condition, when ioctl'ing hanged up | |
1309 | and opened by another process device. | |
1310 | */ | |
1311 | if (sl->tty != current->signal->tty && sl->pid != current->pid) { | |
1312 | spin_unlock_bh(&sl->lock); | |
1313 | return -EPERM; | |
1314 | } | |
1315 | sl->leased = 0; | |
1316 | if (*p) | |
1317 | sl->leased = 1; | |
1318 | break; | |
1319 | ||
1320 | case SIOCGLEASE: | |
1321 | *p = sl->leased; | |
1322 | }; | |
1323 | spin_unlock_bh(&sl->lock); | |
1324 | return 0; | |
1325 | } | |
1326 | #endif | |
1327 | /* VSV changes end */ | |
1328 | ||
1329 | static struct tty_ldisc sl_ldisc = { | |
1330 | .owner = THIS_MODULE, | |
1331 | .magic = TTY_LDISC_MAGIC, | |
1332 | .name = "slip", | |
1333 | .open = slip_open, | |
1334 | .close = slip_close, | |
1335 | .ioctl = slip_ioctl, | |
1336 | .receive_buf = slip_receive_buf, | |
1337 | .receive_room = slip_receive_room, | |
1338 | .write_wakeup = slip_write_wakeup, | |
1339 | }; | |
1340 | ||
1341 | static int __init slip_init(void) | |
1342 | { | |
1343 | int status; | |
1344 | ||
1345 | if (slip_maxdev < 4) | |
1346 | slip_maxdev = 4; /* Sanity */ | |
1347 | ||
1348 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1349 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1350 | " (6 bit encapsulation enabled)" | |
1351 | #endif | |
1352 | ".\n", | |
1353 | SLIP_VERSION, slip_maxdev ); | |
1354 | #if defined(SL_INCLUDE_CSLIP) | |
1355 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1356 | #endif | |
1357 | #ifdef CONFIG_SLIP_SMART | |
1358 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1359 | #endif | |
1360 | ||
1361 | slip_devs = kmalloc(sizeof(struct net_device *)*slip_maxdev, GFP_KERNEL); | |
1362 | if (!slip_devs) { | |
1363 | printk(KERN_ERR "SLIP: Can't allocate slip devices array! Uaargh! (-> No SLIP available)\n"); | |
1364 | return -ENOMEM; | |
1365 | } | |
1366 | ||
1367 | /* Clear the pointer array, we allocate devices when we need them */ | |
1368 | memset(slip_devs, 0, sizeof(struct net_device *)*slip_maxdev); | |
1369 | ||
1370 | /* Fill in our line protocol discipline, and register it */ | |
1371 | if ((status = tty_register_ldisc(N_SLIP, &sl_ldisc)) != 0) { | |
1372 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); | |
1373 | kfree(slip_devs); | |
1374 | } | |
1375 | return status; | |
1376 | } | |
1377 | ||
1378 | static void __exit slip_exit(void) | |
1379 | { | |
1380 | int i; | |
1381 | struct net_device *dev; | |
1382 | struct slip *sl; | |
1383 | unsigned long timeout = jiffies + HZ; | |
1384 | int busy = 0; | |
1385 | ||
1386 | if (slip_devs == NULL) | |
1387 | return; | |
1388 | ||
1389 | /* First of all: check for active disciplines and hangup them. | |
1390 | */ | |
1391 | do { | |
1392 | if (busy) { | |
1393 | set_current_state(TASK_INTERRUPTIBLE); | |
1394 | schedule_timeout(HZ / 10); | |
1395 | } | |
1396 | ||
1397 | busy = 0; | |
1398 | for (i = 0; i < slip_maxdev; i++) { | |
1399 | dev = slip_devs[i]; | |
1400 | if (!dev) | |
1401 | continue; | |
1402 | sl = netdev_priv(dev); | |
1403 | spin_lock_bh(&sl->lock); | |
1404 | if (sl->tty) { | |
1405 | busy++; | |
1406 | tty_hangup(sl->tty); | |
1407 | } | |
1408 | spin_unlock_bh(&sl->lock); | |
1409 | } | |
1410 | } while (busy && time_before(jiffies, timeout)); | |
1411 | ||
1412 | ||
1413 | for (i = 0; i < slip_maxdev; i++) { | |
1414 | dev = slip_devs[i]; | |
1415 | if (!dev) | |
1416 | continue; | |
1417 | slip_devs[i] = NULL; | |
1418 | ||
1419 | sl = netdev_priv(dev); | |
1420 | if (sl->tty) { | |
1421 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1422 | dev->name); | |
1423 | /* Intentionally leak the control block. */ | |
1424 | dev->destructor = NULL; | |
1425 | } | |
1426 | ||
1427 | unregister_netdev(dev); | |
1428 | } | |
1429 | ||
1430 | kfree(slip_devs); | |
1431 | slip_devs = NULL; | |
1432 | ||
1433 | if ((i = tty_register_ldisc(N_SLIP, NULL))) | |
1434 | { | |
1435 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | module_init(slip_init); | |
1440 | module_exit(slip_exit); | |
1441 | ||
1442 | #ifdef CONFIG_SLIP_SMART | |
1443 | /* | |
1444 | * This is start of the code for multislip style line checking | |
1445 | * added by Stanislav Voronyi. All changes before marked VSV | |
1446 | */ | |
1447 | ||
1448 | static void sl_outfill(unsigned long sls) | |
1449 | { | |
1450 | struct slip *sl=(struct slip *)sls; | |
1451 | ||
1452 | spin_lock(&sl->lock); | |
1453 | ||
1454 | if (sl->tty == NULL) | |
1455 | goto out; | |
1456 | ||
1457 | if(sl->outfill) | |
1458 | { | |
1459 | if( test_bit(SLF_OUTWAIT, &sl->flags) ) | |
1460 | { | |
1461 | /* no packets were transmitted, do outfill */ | |
1462 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1463 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1464 | #else | |
1465 | unsigned char s = END; | |
1466 | #endif | |
1467 | /* put END into tty queue. Is it right ??? */ | |
1468 | if (!netif_queue_stopped(sl->dev)) | |
1469 | { | |
1470 | /* if device busy no outfill */ | |
1471 | sl->tty->driver->write(sl->tty, &s, 1); | |
1472 | } | |
1473 | } | |
1474 | else | |
1475 | set_bit(SLF_OUTWAIT, &sl->flags); | |
1476 | ||
1477 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1478 | } | |
1479 | out: | |
1480 | spin_unlock(&sl->lock); | |
1481 | } | |
1482 | ||
1483 | static void sl_keepalive(unsigned long sls) | |
1484 | { | |
1485 | struct slip *sl=(struct slip *)sls; | |
1486 | ||
1487 | spin_lock(&sl->lock); | |
1488 | ||
1489 | if (sl->tty == NULL) | |
1490 | goto out; | |
1491 | ||
1492 | if( sl->keepalive) | |
1493 | { | |
1494 | if(test_bit(SLF_KEEPTEST, &sl->flags)) | |
1495 | { | |
1496 | /* keepalive still high :(, we must hangup */ | |
1497 | if( sl->outfill ) /* outfill timer must be deleted too */ | |
1498 | (void)del_timer(&sl->outfill_timer); | |
1499 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
1500 | tty_hangup(sl->tty); /* this must hangup tty & close slip */ | |
1501 | /* I think we need not something else */ | |
1502 | goto out; | |
1503 | } | |
1504 | else | |
1505 | set_bit(SLF_KEEPTEST, &sl->flags); | |
1506 | ||
1507 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1508 | } | |
1509 | ||
1510 | out: | |
1511 | spin_unlock(&sl->lock); | |
1512 | } | |
1513 | ||
1514 | #endif | |
1515 | MODULE_LICENSE("GPL"); | |
1516 | MODULE_ALIAS_LDISC(N_SLIP); |