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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. | |
9ce6cf25 AC |
14 | * Alan Cox : Found cause of overrun. ifconfig sl0 |
15 | * mtu upwards. Driver now spots this | |
16 | * and grows/shrinks its buffers(hack!). | |
17 | * Memory leak if you run out of memory | |
18 | * setting up a slip driver fixed. | |
1da177e4 LT |
19 | * Matt Dillon : Printable slip (borrowed from NET2E) |
20 | * Pauline Middelink : Slip driver fixes. | |
21 | * Alan Cox : Honours the old SL_COMPRESSED flag | |
22 | * Alan Cox : KISS AX.25 and AXUI IP support | |
23 | * Michael Riepe : Automatic CSLIP recognition added | |
24 | * Charles Hedrick : CSLIP header length problem fix. | |
25 | * Alan Cox : Corrected non-IP cases of the above. | |
26 | * Alan Cox : Now uses hardware type as per FvK. | |
27 | * Alan Cox : Default to 192.168.0.0 (RFC 1597) | |
28 | * A.N.Kuznetsov : dev_tint() recursion fix. | |
29 | * Dmitry Gorodchanin : SLIP memory leaks | |
30 | * Dmitry Gorodchanin : Code cleanup. Reduce tty driver | |
31 | * buffering from 4096 to 256 bytes. | |
32 | * Improving SLIP response time. | |
33 | * CONFIG_SLIP_MODE_SLIP6. | |
9ce6cf25 AC |
34 | * ifconfig sl? up & down now works |
35 | * correctly. | |
1da177e4 LT |
36 | * Modularization. |
37 | * Alan Cox : Oops - fix AX.25 buffer lengths | |
38 | * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP | |
39 | * statistics. Include CSLIP code only | |
40 | * if it really needed. | |
41 | * Alan Cox : Free slhc buffers in the right place. | |
42 | * Alan Cox : Allow for digipeated IP over AX.25 | |
43 | * Matti Aarnio : Dynamic SLIP devices, with ideas taken | |
44 | * from Jim Freeman's <jfree@caldera.com> | |
45 | * dynamic PPP devices. We do NOT kfree() | |
46 | * device entries, just reg./unreg. them | |
47 | * as they are needed. We kfree() them | |
48 | * at module cleanup. | |
9ce6cf25 AC |
49 | * With MODULE-loading ``insmod'', user |
50 | * can issue parameter: slip_maxdev=1024 | |
51 | * (Or how much he/she wants.. Default | |
52 | * is 256) | |
53 | * Stanislav Voronyi : Slip line checking, with ideas taken | |
54 | * from multislip BSDI driver which was | |
55 | * written by Igor Chechik, RELCOM Corp. | |
56 | * Only algorithms have been ported to | |
57 | * Linux SLIP driver. | |
1da177e4 | 58 | * Vitaly E. Lavrov : Sane behaviour on tty hangup. |
9ce6cf25 AC |
59 | * Alexey Kuznetsov : Cleanup interfaces to tty & netdevice |
60 | * modules. | |
1da177e4 LT |
61 | */ |
62 | ||
63 | #define SL_CHECK_TRANSMIT | |
1da177e4 LT |
64 | #include <linux/module.h> |
65 | #include <linux/moduleparam.h> | |
66 | ||
67 | #include <asm/system.h> | |
68 | #include <asm/uaccess.h> | |
69 | #include <linux/bitops.h> | |
d43c36dc | 70 | #include <linux/sched.h> |
1da177e4 LT |
71 | #include <linux/string.h> |
72 | #include <linux/mm.h> | |
73 | #include <linux/interrupt.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/tty.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/netdevice.h> | |
78 | #include <linux/etherdevice.h> | |
79 | #include <linux/skbuff.h> | |
80 | #include <linux/rtnetlink.h> | |
81 | #include <linux/if_arp.h> | |
82 | #include <linux/if_slip.h> | |
9646e7ce | 83 | #include <linux/compat.h> |
12dc2fdd | 84 | #include <linux/delay.h> |
1da177e4 | 85 | #include <linux/init.h> |
5a0e3ad6 | 86 | #include <linux/slab.h> |
1da177e4 LT |
87 | #include "slip.h" |
88 | #ifdef CONFIG_INET | |
89 | #include <linux/ip.h> | |
90 | #include <linux/tcp.h> | |
91 | #include <net/slhc_vj.h> | |
92 | #endif | |
93 | ||
94 | #define SLIP_VERSION "0.8.4-NET3.019-NEWTTY" | |
95 | ||
96 | static struct net_device **slip_devs; | |
97 | ||
98 | static int slip_maxdev = SL_NRUNIT; | |
99 | module_param(slip_maxdev, int, 0); | |
100 | MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices"); | |
101 | ||
102 | static int slip_esc(unsigned char *p, unsigned char *d, int len); | |
103 | static void slip_unesc(struct slip *sl, unsigned char c); | |
104 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
105 | static int slip_esc6(unsigned char *p, unsigned char *d, int len); | |
106 | static void slip_unesc6(struct slip *sl, unsigned char c); | |
107 | #endif | |
108 | #ifdef CONFIG_SLIP_SMART | |
109 | static void sl_keepalive(unsigned long sls); | |
110 | static void sl_outfill(unsigned long sls); | |
9ce6cf25 | 111 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); |
1da177e4 LT |
112 | #endif |
113 | ||
114 | /******************************** | |
115 | * Buffer administration routines: | |
116 | * sl_alloc_bufs() | |
117 | * sl_free_bufs() | |
118 | * sl_realloc_bufs() | |
119 | * | |
120 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
121 | * sl_realloc_bufs provides strong atomicity and reallocation | |
122 | * on actively running device. | |
123 | *********************************/ | |
124 | ||
6aa20a22 | 125 | /* |
1da177e4 LT |
126 | Allocate channel buffers. |
127 | */ | |
128 | ||
9ce6cf25 | 129 | static int sl_alloc_bufs(struct slip *sl, int mtu) |
1da177e4 LT |
130 | { |
131 | int err = -ENOBUFS; | |
132 | unsigned long len; | |
9ce6cf25 AC |
133 | char *rbuff = NULL; |
134 | char *xbuff = NULL; | |
1da177e4 | 135 | #ifdef SL_INCLUDE_CSLIP |
9ce6cf25 | 136 | char *cbuff = NULL; |
1da177e4 LT |
137 | struct slcompress *slcomp = NULL; |
138 | #endif | |
139 | ||
140 | /* | |
141 | * Allocate the SLIP frame buffers: | |
142 | * | |
143 | * rbuff Receive buffer. | |
144 | * xbuff Transmit buffer. | |
145 | * cbuff Temporary compression buffer. | |
146 | */ | |
147 | len = mtu * 2; | |
148 | ||
149 | /* | |
150 | * allow for arrival of larger UDP packets, even if we say not to | |
151 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
152 | * an MSS of 128 | |
153 | */ | |
154 | if (len < 576 * 2) | |
155 | len = 576 * 2; | |
156 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
157 | if (rbuff == NULL) | |
158 | goto err_exit; | |
159 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
160 | if (xbuff == NULL) | |
161 | goto err_exit; | |
162 | #ifdef SL_INCLUDE_CSLIP | |
163 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
164 | if (cbuff == NULL) | |
165 | goto err_exit; | |
166 | slcomp = slhc_init(16, 16); | |
167 | if (slcomp == NULL) | |
168 | goto err_exit; | |
169 | #endif | |
170 | spin_lock_bh(&sl->lock); | |
171 | if (sl->tty == NULL) { | |
172 | spin_unlock_bh(&sl->lock); | |
173 | err = -ENODEV; | |
174 | goto err_exit; | |
175 | } | |
176 | sl->mtu = mtu; | |
177 | sl->buffsize = len; | |
178 | sl->rcount = 0; | |
179 | sl->xleft = 0; | |
180 | rbuff = xchg(&sl->rbuff, rbuff); | |
181 | xbuff = xchg(&sl->xbuff, xbuff); | |
182 | #ifdef SL_INCLUDE_CSLIP | |
183 | cbuff = xchg(&sl->cbuff, cbuff); | |
184 | slcomp = xchg(&sl->slcomp, slcomp); | |
185 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
186 | sl->xdata = 0; | |
187 | sl->xbits = 0; | |
188 | #endif | |
189 | #endif | |
190 | spin_unlock_bh(&sl->lock); | |
191 | err = 0; | |
192 | ||
193 | /* Cleanup */ | |
194 | err_exit: | |
195 | #ifdef SL_INCLUDE_CSLIP | |
158a0e45 | 196 | kfree(cbuff); |
1da177e4 LT |
197 | if (slcomp) |
198 | slhc_free(slcomp); | |
199 | #endif | |
158a0e45 JJ |
200 | kfree(xbuff); |
201 | kfree(rbuff); | |
1da177e4 LT |
202 | return err; |
203 | } | |
204 | ||
205 | /* Free a SLIP channel buffers. */ | |
9ce6cf25 | 206 | static void sl_free_bufs(struct slip *sl) |
1da177e4 | 207 | { |
1da177e4 | 208 | /* Free all SLIP frame buffers. */ |
9b200b02 JJ |
209 | kfree(xchg(&sl->rbuff, NULL)); |
210 | kfree(xchg(&sl->xbuff, NULL)); | |
1da177e4 | 211 | #ifdef SL_INCLUDE_CSLIP |
9b200b02 JJ |
212 | kfree(xchg(&sl->cbuff, NULL)); |
213 | slhc_free(xchg(&sl->slcomp, NULL)); | |
1da177e4 LT |
214 | #endif |
215 | } | |
216 | ||
6aa20a22 | 217 | /* |
1da177e4 LT |
218 | Reallocate slip channel buffers. |
219 | */ | |
220 | ||
221 | static int sl_realloc_bufs(struct slip *sl, int mtu) | |
222 | { | |
223 | int err = 0; | |
224 | struct net_device *dev = sl->dev; | |
225 | unsigned char *xbuff, *rbuff; | |
226 | #ifdef SL_INCLUDE_CSLIP | |
227 | unsigned char *cbuff; | |
228 | #endif | |
229 | int len = mtu * 2; | |
230 | ||
231 | /* | |
232 | * allow for arrival of larger UDP packets, even if we say not to | |
233 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
234 | * an MSS of 128 | |
235 | */ | |
236 | if (len < 576 * 2) | |
237 | len = 576 * 2; | |
238 | ||
5cbded58 RD |
239 | xbuff = kmalloc(len + 4, GFP_ATOMIC); |
240 | rbuff = kmalloc(len + 4, GFP_ATOMIC); | |
1da177e4 | 241 | #ifdef SL_INCLUDE_CSLIP |
5cbded58 | 242 | cbuff = kmalloc(len + 4, GFP_ATOMIC); |
1da177e4 LT |
243 | #endif |
244 | ||
245 | ||
246 | #ifdef SL_INCLUDE_CSLIP | |
247 | if (xbuff == NULL || rbuff == NULL || cbuff == NULL) { | |
248 | #else | |
249 | if (xbuff == NULL || rbuff == NULL) { | |
250 | #endif | |
251 | if (mtu >= sl->mtu) { | |
252 | printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n", | |
253 | dev->name); | |
254 | err = -ENOBUFS; | |
255 | } | |
256 | goto done; | |
257 | } | |
1da177e4 LT |
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. */ | |
9ce6cf25 | 307 | static inline void sl_lock(struct slip *sl) |
1da177e4 LT |
308 | { |
309 | netif_stop_queue(sl->dev); | |
310 | } | |
311 | ||
312 | ||
313 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ | |
9ce6cf25 | 314 | static inline void sl_unlock(struct slip *sl) |
1da177e4 LT |
315 | { |
316 | netif_wake_queue(sl->dev); | |
317 | } | |
318 | ||
319 | /* Send one completely decapsulated IP datagram to the IP layer. */ | |
9ce6cf25 | 320 | static void sl_bump(struct slip *sl) |
1da177e4 LT |
321 | { |
322 | struct sk_buff *skb; | |
323 | int count; | |
324 | ||
325 | count = sl->rcount; | |
326 | #ifdef SL_INCLUDE_CSLIP | |
327 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
9ce6cf25 AC |
328 | unsigned char c = sl->rbuff[0]; |
329 | if (c & SL_TYPE_COMPRESSED_TCP) { | |
1da177e4 LT |
330 | /* ignore compressed packets when CSLIP is off */ |
331 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
332 | printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name); | |
333 | return; | |
334 | } | |
9ce6cf25 AC |
335 | /* make sure we've reserved enough space for uncompress |
336 | to use */ | |
1da177e4 LT |
337 | if (count + 80 > sl->buffsize) { |
338 | sl->rx_over_errors++; | |
339 | return; | |
340 | } | |
341 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
9ce6cf25 | 342 | if (count <= 0) |
1da177e4 | 343 | return; |
1da177e4 LT |
344 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { |
345 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
346 | /* turn on header compression */ | |
347 | sl->mode |= SL_MODE_CSLIP; | |
348 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
349 | printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name); | |
350 | } | |
351 | sl->rbuff[0] &= 0x4f; | |
9ce6cf25 | 352 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) |
1da177e4 | 353 | return; |
1da177e4 LT |
354 | } |
355 | } | |
356 | #endif /* SL_INCLUDE_CSLIP */ | |
357 | ||
9ce6cf25 | 358 | sl->rx_bytes += count; |
6aa20a22 | 359 | |
1da177e4 | 360 | skb = dev_alloc_skb(count); |
9ce6cf25 | 361 | if (skb == NULL) { |
1da177e4 LT |
362 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name); |
363 | sl->rx_dropped++; | |
364 | return; | |
365 | } | |
366 | skb->dev = sl->dev; | |
9ce6cf25 | 367 | memcpy(skb_put(skb, count), sl->rbuff, count); |
98e399f8 | 368 | skb_reset_mac_header(skb); |
9ce6cf25 | 369 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 370 | netif_rx(skb); |
1da177e4 LT |
371 | sl->rx_packets++; |
372 | } | |
373 | ||
374 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
9ce6cf25 | 375 | static void sl_encaps(struct slip *sl, unsigned char *icp, int len) |
1da177e4 LT |
376 | { |
377 | unsigned char *p; | |
378 | int actual, count; | |
379 | ||
380 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
381 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
382 | sl->tx_dropped++; | |
383 | sl_unlock(sl); | |
384 | return; | |
385 | } | |
386 | ||
387 | p = icp; | |
388 | #ifdef SL_INCLUDE_CSLIP | |
9ce6cf25 | 389 | if (sl->mode & SL_MODE_CSLIP) |
1da177e4 | 390 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); |
1da177e4 LT |
391 | #endif |
392 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 393 | if (sl->mode & SL_MODE_SLIP6) |
1da177e4 LT |
394 | count = slip_esc6(p, (unsigned char *) sl->xbuff, len); |
395 | else | |
396 | #endif | |
397 | count = slip_esc(p, (unsigned char *) sl->xbuff, len); | |
398 | ||
399 | /* Order of next two lines is *very* important. | |
400 | * When we are sending a little amount of data, | |
f34d7a5b | 401 | * the transfer may be completed inside the ops->write() |
1da177e4 LT |
402 | * routine, because it's running with interrupts enabled. |
403 | * In this case we *never* got WRITE_WAKEUP event, | |
404 | * if we did not request it before write operation. | |
405 | * 14 Oct 1994 Dmitry Gorodchanin. | |
406 | */ | |
8a1ec21e | 407 | set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
f34d7a5b | 408 | actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
1da177e4 LT |
409 | #ifdef SL_CHECK_TRANSMIT |
410 | sl->dev->trans_start = jiffies; | |
411 | #endif | |
412 | sl->xleft = count - actual; | |
413 | sl->xhead = sl->xbuff + actual; | |
414 | #ifdef CONFIG_SLIP_SMART | |
415 | /* VSV */ | |
416 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
417 | #endif | |
418 | } | |
419 | ||
420 | /* | |
421 | * Called by the driver when there's room for more data. If we have | |
422 | * more packets to send, we send them here. | |
423 | */ | |
424 | static void slip_write_wakeup(struct tty_struct *tty) | |
425 | { | |
426 | int actual; | |
9ce6cf25 | 427 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
428 | |
429 | /* First make sure we're connected. */ | |
9ce6cf25 | 430 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 | 431 | return; |
9ce6cf25 | 432 | |
1da177e4 LT |
433 | if (sl->xleft <= 0) { |
434 | /* Now serial buffer is almost free & we can start | |
435 | * transmission of another packet */ | |
436 | sl->tx_packets++; | |
8a1ec21e | 437 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
1da177e4 LT |
438 | sl_unlock(sl); |
439 | return; | |
440 | } | |
441 | ||
f34d7a5b | 442 | actual = tty->ops->write(tty, sl->xhead, sl->xleft); |
1da177e4 LT |
443 | sl->xleft -= actual; |
444 | sl->xhead += actual; | |
445 | } | |
446 | ||
447 | static void sl_tx_timeout(struct net_device *dev) | |
448 | { | |
449 | struct slip *sl = netdev_priv(dev); | |
450 | ||
451 | spin_lock(&sl->lock); | |
452 | ||
453 | if (netif_queue_stopped(dev)) { | |
454 | if (!netif_running(dev)) | |
455 | goto out; | |
456 | ||
457 | /* May be we must check transmitter timeout here ? | |
458 | * 14 Oct 1994 Dmitry Gorodchanin. | |
459 | */ | |
460 | #ifdef SL_CHECK_TRANSMIT | |
1ae5dc34 | 461 | if (time_before(jiffies, dev_trans_start(dev) + 20 * HZ)) { |
1da177e4 LT |
462 | /* 20 sec timeout not reached */ |
463 | goto out; | |
464 | } | |
9ce6cf25 AC |
465 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", |
466 | dev->name, | |
f34d7a5b | 467 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
9ce6cf25 | 468 | "bad line quality" : "driver error"); |
1da177e4 | 469 | sl->xleft = 0; |
8a1ec21e | 470 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
471 | sl_unlock(sl); |
472 | #endif | |
473 | } | |
1da177e4 LT |
474 | out: |
475 | spin_unlock(&sl->lock); | |
476 | } | |
477 | ||
478 | ||
479 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
424efe9c | 480 | static netdev_tx_t |
1da177e4 LT |
481 | sl_xmit(struct sk_buff *skb, struct net_device *dev) |
482 | { | |
483 | struct slip *sl = netdev_priv(dev); | |
484 | ||
485 | spin_lock(&sl->lock); | |
9ce6cf25 | 486 | if (!netif_running(dev)) { |
1da177e4 LT |
487 | spin_unlock(&sl->lock); |
488 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
489 | dev_kfree_skb(skb); | |
6ed10654 | 490 | return NETDEV_TX_OK; |
1da177e4 LT |
491 | } |
492 | if (sl->tty == NULL) { | |
493 | spin_unlock(&sl->lock); | |
494 | dev_kfree_skb(skb); | |
6ed10654 | 495 | return NETDEV_TX_OK; |
1da177e4 LT |
496 | } |
497 | ||
498 | sl_lock(sl); | |
9ce6cf25 | 499 | sl->tx_bytes += skb->len; |
1da177e4 LT |
500 | sl_encaps(sl, skb->data, skb->len); |
501 | spin_unlock(&sl->lock); | |
502 | ||
503 | dev_kfree_skb(skb); | |
6ed10654 | 504 | return NETDEV_TX_OK; |
1da177e4 LT |
505 | } |
506 | ||
507 | ||
508 | /****************************************** | |
509 | * Routines looking at netdevice side. | |
510 | ******************************************/ | |
511 | ||
512 | /* Netdevice UP -> DOWN routine */ | |
513 | ||
514 | static int | |
515 | sl_close(struct net_device *dev) | |
516 | { | |
517 | struct slip *sl = netdev_priv(dev); | |
518 | ||
519 | spin_lock_bh(&sl->lock); | |
8a1ec21e | 520 | if (sl->tty) |
1da177e4 | 521 | /* TTY discipline is running. */ |
8a1ec21e | 522 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
523 | netif_stop_queue(dev); |
524 | sl->rcount = 0; | |
525 | sl->xleft = 0; | |
526 | spin_unlock_bh(&sl->lock); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /* Netdevice DOWN -> UP routine */ | |
532 | ||
533 | static int sl_open(struct net_device *dev) | |
534 | { | |
535 | struct slip *sl = netdev_priv(dev); | |
536 | ||
9ce6cf25 | 537 | if (sl->tty == NULL) |
1da177e4 LT |
538 | return -ENODEV; |
539 | ||
540 | sl->flags &= (1 << SLF_INUSE); | |
541 | netif_start_queue(dev); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | /* Netdevice change MTU request */ | |
546 | ||
547 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
548 | { | |
549 | struct slip *sl = netdev_priv(dev); | |
550 | ||
551 | if (new_mtu < 68 || new_mtu > 65534) | |
552 | return -EINVAL; | |
553 | ||
554 | if (new_mtu != dev->mtu) | |
555 | return sl_realloc_bufs(sl, new_mtu); | |
556 | return 0; | |
557 | } | |
558 | ||
559 | /* Netdevice get statistics request */ | |
560 | ||
561 | static struct net_device_stats * | |
562 | sl_get_stats(struct net_device *dev) | |
563 | { | |
564 | static struct net_device_stats stats; | |
565 | struct slip *sl = netdev_priv(dev); | |
566 | #ifdef SL_INCLUDE_CSLIP | |
567 | struct slcompress *comp; | |
568 | #endif | |
569 | ||
570 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
571 | ||
572 | stats.rx_packets = sl->rx_packets; | |
573 | stats.tx_packets = sl->tx_packets; | |
574 | stats.rx_bytes = sl->rx_bytes; | |
575 | stats.tx_bytes = sl->tx_bytes; | |
576 | stats.rx_dropped = sl->rx_dropped; | |
577 | stats.tx_dropped = sl->tx_dropped; | |
578 | stats.tx_errors = sl->tx_errors; | |
579 | stats.rx_errors = sl->rx_errors; | |
580 | stats.rx_over_errors = sl->rx_over_errors; | |
581 | #ifdef SL_INCLUDE_CSLIP | |
582 | stats.rx_fifo_errors = sl->rx_compressed; | |
583 | stats.tx_fifo_errors = sl->tx_compressed; | |
584 | stats.collisions = sl->tx_misses; | |
585 | comp = sl->slcomp; | |
586 | if (comp) { | |
587 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
588 | stats.rx_dropped += comp->sls_i_tossed; | |
589 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
590 | stats.collisions += comp->sls_o_misses; | |
591 | } | |
592 | #endif /* CONFIG_INET */ | |
593 | return (&stats); | |
594 | } | |
595 | ||
596 | /* Netdevice register callback */ | |
597 | ||
598 | static int sl_init(struct net_device *dev) | |
599 | { | |
600 | struct slip *sl = netdev_priv(dev); | |
601 | ||
602 | /* | |
6aa20a22 | 603 | * Finish setting up the DEVICE info. |
1da177e4 LT |
604 | */ |
605 | ||
606 | dev->mtu = sl->mtu; | |
607 | dev->type = ARPHRD_SLIP + sl->mode; | |
608 | #ifdef SL_CHECK_TRANSMIT | |
1da177e4 LT |
609 | dev->watchdog_timeo = 20*HZ; |
610 | #endif | |
611 | return 0; | |
612 | } | |
613 | ||
614 | ||
615 | static void sl_uninit(struct net_device *dev) | |
616 | { | |
617 | struct slip *sl = netdev_priv(dev); | |
618 | ||
619 | sl_free_bufs(sl); | |
620 | } | |
621 | ||
5342b77c AC |
622 | /* Hook the destructor so we can free slip devices at the right point in time */ |
623 | static void sl_free_netdev(struct net_device *dev) | |
624 | { | |
625 | int i = dev->base_addr; | |
626 | free_netdev(dev); | |
627 | slip_devs[i] = NULL; | |
628 | } | |
629 | ||
b1da683d SH |
630 | static const struct net_device_ops sl_netdev_ops = { |
631 | .ndo_init = sl_init, | |
632 | .ndo_uninit = sl_uninit, | |
633 | .ndo_open = sl_open, | |
634 | .ndo_stop = sl_close, | |
635 | .ndo_start_xmit = sl_xmit, | |
636 | .ndo_get_stats = sl_get_stats, | |
637 | .ndo_change_mtu = sl_change_mtu, | |
638 | .ndo_tx_timeout = sl_tx_timeout, | |
639 | #ifdef CONFIG_SLIP_SMART | |
640 | .ndo_do_ioctl = sl_ioctl, | |
641 | #endif | |
642 | }; | |
643 | ||
644 | ||
1da177e4 LT |
645 | static void sl_setup(struct net_device *dev) |
646 | { | |
b1da683d | 647 | dev->netdev_ops = &sl_netdev_ops; |
5342b77c | 648 | dev->destructor = sl_free_netdev; |
b1da683d | 649 | |
1da177e4 LT |
650 | dev->hard_header_len = 0; |
651 | dev->addr_len = 0; | |
652 | dev->tx_queue_len = 10; | |
653 | ||
1da177e4 LT |
654 | /* New-style flags. */ |
655 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
656 | } | |
657 | ||
658 | /****************************************** | |
659 | Routines looking at TTY side. | |
660 | ******************************************/ | |
661 | ||
662 | ||
1da177e4 LT |
663 | /* |
664 | * Handle the 'receiver data ready' interrupt. | |
665 | * This function is called by the 'tty_io' module in the kernel when | |
666 | * a block of SLIP data has been received, which can now be decapsulated | |
667 | * and sent on to some IP layer for further processing. This will not | |
668 | * be re-entered while running but other ldisc functions may be called | |
669 | * in parallel | |
670 | */ | |
6aa20a22 | 671 | |
9ce6cf25 AC |
672 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
673 | char *fp, int count) | |
1da177e4 | 674 | { |
9ce6cf25 | 675 | struct slip *sl = tty->disc_data; |
1da177e4 | 676 | |
9ce6cf25 | 677 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 LT |
678 | return; |
679 | ||
680 | /* Read the characters out of the buffer */ | |
681 | while (count--) { | |
682 | if (fp && *fp++) { | |
9ce6cf25 | 683 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
1da177e4 | 684 | sl->rx_errors++; |
1da177e4 LT |
685 | cp++; |
686 | continue; | |
687 | } | |
688 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
689 | if (sl->mode & SL_MODE_SLIP6) | |
690 | slip_unesc6(sl, *cp++); | |
691 | else | |
692 | #endif | |
693 | slip_unesc(sl, *cp++); | |
694 | } | |
695 | } | |
696 | ||
697 | /************************************ | |
698 | * slip_open helper routines. | |
699 | ************************************/ | |
700 | ||
701 | /* Collect hanged up channels */ | |
1da177e4 LT |
702 | static void sl_sync(void) |
703 | { | |
704 | int i; | |
705 | struct net_device *dev; | |
706 | struct slip *sl; | |
707 | ||
708 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
709 | dev = slip_devs[i]; |
710 | if (dev == NULL) | |
1da177e4 LT |
711 | break; |
712 | ||
713 | sl = netdev_priv(dev); | |
714 | if (sl->tty || sl->leased) | |
715 | continue; | |
9ce6cf25 | 716 | if (dev->flags & IFF_UP) |
1da177e4 LT |
717 | dev_close(dev); |
718 | } | |
719 | } | |
720 | ||
721 | ||
722 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
9ce6cf25 | 723 | static struct slip *sl_alloc(dev_t line) |
1da177e4 LT |
724 | { |
725 | int i; | |
1da177e4 LT |
726 | struct net_device *dev = NULL; |
727 | struct slip *sl; | |
728 | ||
6aa20a22 | 729 | if (slip_devs == NULL) |
1da177e4 LT |
730 | return NULL; /* Master array missing ! */ |
731 | ||
732 | for (i = 0; i < slip_maxdev; i++) { | |
733 | dev = slip_devs[i]; | |
734 | if (dev == NULL) | |
735 | break; | |
1da177e4 | 736 | } |
1da177e4 LT |
737 | /* Sorry, too many, all slots in use */ |
738 | if (i >= slip_maxdev) | |
739 | return NULL; | |
740 | ||
741 | if (dev) { | |
742 | sl = netdev_priv(dev); | |
743 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
744 | unregister_netdevice(dev); | |
745 | dev = NULL; | |
746 | slip_devs[i] = NULL; | |
747 | } | |
748 | } | |
6aa20a22 | 749 | |
1da177e4 LT |
750 | if (!dev) { |
751 | char name[IFNAMSIZ]; | |
752 | sprintf(name, "sl%d", i); | |
753 | ||
754 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
755 | if (!dev) | |
756 | return NULL; | |
757 | dev->base_addr = i; | |
758 | } | |
759 | ||
760 | sl = netdev_priv(dev); | |
761 | ||
762 | /* Initialize channel control data */ | |
763 | sl->magic = SLIP_MAGIC; | |
764 | sl->dev = dev; | |
765 | spin_lock_init(&sl->lock); | |
766 | sl->mode = SL_MODE_DEFAULT; | |
767 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
768 | /* initialize timer_list struct */ |
769 | init_timer(&sl->keepalive_timer); | |
770 | sl->keepalive_timer.data = (unsigned long)sl; | |
771 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 772 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
773 | sl->outfill_timer.data = (unsigned long)sl; |
774 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
775 | #endif |
776 | slip_devs[i] = dev; | |
1da177e4 LT |
777 | return sl; |
778 | } | |
779 | ||
780 | /* | |
781 | * Open the high-level part of the SLIP channel. | |
782 | * This function is called by the TTY module when the | |
783 | * SLIP line discipline is called for. Because we are | |
784 | * sure the tty line exists, we only have to link it to | |
785 | * a free SLIP channel... | |
786 | * | |
787 | * Called in process context serialized from other ldisc calls. | |
788 | */ | |
789 | ||
790 | static int slip_open(struct tty_struct *tty) | |
791 | { | |
792 | struct slip *sl; | |
793 | int err; | |
794 | ||
9ce6cf25 | 795 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 796 | return -EPERM; |
6aa20a22 | 797 | |
f34d7a5b AC |
798 | if (tty->ops->write == NULL) |
799 | return -EOPNOTSUPP; | |
800 | ||
1da177e4 LT |
801 | /* RTnetlink lock is misused here to serialize concurrent |
802 | opens of slip channels. There are better ways, but it is | |
803 | the simplest one. | |
804 | */ | |
805 | rtnl_lock(); | |
806 | ||
807 | /* Collect hanged up channels. */ | |
808 | sl_sync(); | |
809 | ||
9ce6cf25 | 810 | sl = tty->disc_data; |
1da177e4 LT |
811 | |
812 | err = -EEXIST; | |
813 | /* First make sure we're not already connected. */ | |
814 | if (sl && sl->magic == SLIP_MAGIC) | |
815 | goto err_exit; | |
816 | ||
817 | /* OK. Find a free SLIP channel to use. */ | |
818 | err = -ENFILE; | |
9ce6cf25 AC |
819 | sl = sl_alloc(tty_devnum(tty)); |
820 | if (sl == NULL) | |
1da177e4 LT |
821 | goto err_exit; |
822 | ||
823 | sl->tty = tty; | |
824 | tty->disc_data = sl; | |
825 | sl->line = tty_devnum(tty); | |
826 | sl->pid = current->pid; | |
6aa20a22 | 827 | |
1da177e4 LT |
828 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
829 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
830 | err = sl_alloc_bufs(sl, SL_MTU); |
831 | if (err) | |
1da177e4 LT |
832 | goto err_free_chan; |
833 | ||
834 | set_bit(SLF_INUSE, &sl->flags); | |
835 | ||
9ce6cf25 AC |
836 | err = register_netdevice(sl->dev); |
837 | if (err) | |
1da177e4 LT |
838 | goto err_free_bufs; |
839 | } | |
840 | ||
841 | #ifdef CONFIG_SLIP_SMART | |
842 | if (sl->keepalive) { | |
9ce6cf25 AC |
843 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
844 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
845 | } |
846 | if (sl->outfill) { | |
9ce6cf25 AC |
847 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
848 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
849 | } |
850 | #endif | |
851 | ||
852 | /* Done. We have linked the TTY line to a channel. */ | |
853 | rtnl_unlock(); | |
33f0f88f | 854 | tty->receive_room = 65536; /* We don't flow control */ |
1da177e4 LT |
855 | return sl->dev->base_addr; |
856 | ||
857 | err_free_bufs: | |
858 | sl_free_bufs(sl); | |
859 | ||
860 | err_free_chan: | |
861 | sl->tty = NULL; | |
862 | tty->disc_data = NULL; | |
863 | clear_bit(SLF_INUSE, &sl->flags); | |
864 | ||
865 | err_exit: | |
866 | rtnl_unlock(); | |
867 | ||
868 | /* Count references from TTY module */ | |
869 | return err; | |
870 | } | |
871 | ||
1da177e4 LT |
872 | /* |
873 | * Close down a SLIP channel. | |
874 | * This means flushing out any pending queues, and then returning. This | |
875 | * call is serialized against other ldisc functions. | |
5342b77c AC |
876 | * |
877 | * We also use this method fo a hangup event | |
1da177e4 | 878 | */ |
5342b77c | 879 | |
9ce6cf25 | 880 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 881 | { |
9ce6cf25 | 882 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
883 | |
884 | /* First make sure we're connected. */ | |
885 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
886 | return; | |
887 | ||
888 | tty->disc_data = NULL; | |
889 | sl->tty = NULL; | |
890 | if (!sl->leased) | |
891 | sl->line = 0; | |
892 | ||
893 | /* VSV = very important to remove timers */ | |
894 | #ifdef CONFIG_SLIP_SMART | |
895 | del_timer_sync(&sl->keepalive_timer); | |
896 | del_timer_sync(&sl->outfill_timer); | |
897 | #endif | |
5342b77c AC |
898 | /* Flush network side */ |
899 | unregister_netdev(sl->dev); | |
900 | /* This will complete via sl_free_netdev */ | |
1da177e4 LT |
901 | } |
902 | ||
5342b77c AC |
903 | static int slip_hangup(struct tty_struct *tty) |
904 | { | |
905 | slip_close(tty); | |
906 | return 0; | |
907 | } | |
1da177e4 LT |
908 | /************************************************************************ |
909 | * STANDARD SLIP ENCAPSULATION * | |
910 | ************************************************************************/ | |
911 | ||
9ce6cf25 | 912 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
913 | { |
914 | unsigned char *ptr = d; | |
915 | unsigned char c; | |
916 | ||
917 | /* | |
918 | * Send an initial END character to flush out any | |
919 | * data that may have accumulated in the receiver | |
920 | * due to line noise. | |
921 | */ | |
922 | ||
923 | *ptr++ = END; | |
924 | ||
925 | /* | |
926 | * For each byte in the packet, send the appropriate | |
927 | * character sequence, according to the SLIP protocol. | |
928 | */ | |
929 | ||
930 | while (len-- > 0) { | |
9ce6cf25 AC |
931 | switch (c = *s++) { |
932 | case END: | |
1da177e4 LT |
933 | *ptr++ = ESC; |
934 | *ptr++ = ESC_END; | |
935 | break; | |
9ce6cf25 | 936 | case ESC: |
1da177e4 LT |
937 | *ptr++ = ESC; |
938 | *ptr++ = ESC_ESC; | |
939 | break; | |
9ce6cf25 | 940 | default: |
1da177e4 LT |
941 | *ptr++ = c; |
942 | break; | |
943 | } | |
944 | } | |
945 | *ptr++ = END; | |
946 | return (ptr - d); | |
947 | } | |
948 | ||
949 | static void slip_unesc(struct slip *sl, unsigned char s) | |
950 | { | |
951 | ||
9ce6cf25 AC |
952 | switch (s) { |
953 | case END: | |
1da177e4 LT |
954 | #ifdef CONFIG_SLIP_SMART |
955 | /* drop keeptest bit = VSV */ | |
956 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
957 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
958 | #endif | |
959 | ||
8e95a202 JP |
960 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
961 | (sl->rcount > 2)) | |
1da177e4 | 962 | sl_bump(sl); |
1da177e4 LT |
963 | clear_bit(SLF_ESCAPE, &sl->flags); |
964 | sl->rcount = 0; | |
965 | return; | |
966 | ||
9ce6cf25 | 967 | case ESC: |
1da177e4 LT |
968 | set_bit(SLF_ESCAPE, &sl->flags); |
969 | return; | |
9ce6cf25 AC |
970 | case ESC_ESC: |
971 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 972 | s = ESC; |
1da177e4 | 973 | break; |
9ce6cf25 AC |
974 | case ESC_END: |
975 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 976 | s = END; |
1da177e4 LT |
977 | break; |
978 | } | |
979 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
980 | if (sl->rcount < sl->buffsize) { | |
981 | sl->rbuff[sl->rcount++] = s; | |
982 | return; | |
983 | } | |
984 | sl->rx_over_errors++; | |
985 | set_bit(SLF_ERROR, &sl->flags); | |
986 | } | |
987 | } | |
988 | ||
989 | ||
990 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
991 | /************************************************************************ | |
992 | * 6 BIT SLIP ENCAPSULATION * | |
993 | ************************************************************************/ | |
994 | ||
9ce6cf25 | 995 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
996 | { |
997 | unsigned char *ptr = d; | |
998 | unsigned char c; | |
999 | int i; | |
1000 | unsigned short v = 0; | |
1001 | short bits = 0; | |
1002 | ||
1003 | /* | |
1004 | * Send an initial END character to flush out any | |
1005 | * data that may have accumulated in the receiver | |
1006 | * due to line noise. | |
1007 | */ | |
1008 | ||
1009 | *ptr++ = 0x70; | |
1010 | ||
1011 | /* | |
1012 | * Encode the packet into printable ascii characters | |
1013 | */ | |
1014 | ||
1015 | for (i = 0; i < len; ++i) { | |
1016 | v = (v << 8) | s[i]; | |
1017 | bits += 8; | |
1018 | while (bits >= 6) { | |
1019 | bits -= 6; | |
1020 | c = 0x30 + ((v >> bits) & 0x3F); | |
1021 | *ptr++ = c; | |
1022 | } | |
1023 | } | |
1024 | if (bits) { | |
1025 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1026 | *ptr++ = c; | |
1027 | } | |
1028 | *ptr++ = 0x70; | |
1029 | return ptr - d; | |
1030 | } | |
1031 | ||
9ce6cf25 | 1032 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1033 | { |
1034 | unsigned char c; | |
1035 | ||
1036 | if (s == 0x70) { | |
1037 | #ifdef CONFIG_SLIP_SMART | |
1038 | /* drop keeptest bit = VSV */ | |
1039 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1040 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1041 | #endif | |
1042 | ||
8e95a202 JP |
1043 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
1044 | (sl->rcount > 2)) | |
1da177e4 | 1045 | sl_bump(sl); |
1da177e4 LT |
1046 | sl->rcount = 0; |
1047 | sl->xbits = 0; | |
1048 | sl->xdata = 0; | |
9ce6cf25 | 1049 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1050 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1051 | sl->xbits += 6; | |
1052 | if (sl->xbits >= 8) { | |
1053 | sl->xbits -= 8; | |
1054 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1055 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1056 | if (sl->rcount < sl->buffsize) { | |
1057 | sl->rbuff[sl->rcount++] = c; | |
1058 | return; | |
1059 | } | |
1060 | sl->rx_over_errors++; | |
1061 | set_bit(SLF_ERROR, &sl->flags); | |
1062 | } | |
1063 | } | |
9ce6cf25 | 1064 | } |
1da177e4 LT |
1065 | } |
1066 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1067 | ||
1068 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1069 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1070 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1071 | { |
9ce6cf25 | 1072 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1073 | unsigned int tmp; |
1074 | int __user *p = (int __user *)arg; | |
1075 | ||
1076 | /* First make sure we're connected. */ | |
9ce6cf25 | 1077 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1078 | return -EINVAL; |
1da177e4 | 1079 | |
9ce6cf25 AC |
1080 | switch (cmd) { |
1081 | case SIOCGIFNAME: | |
1da177e4 LT |
1082 | tmp = strlen(sl->dev->name) + 1; |
1083 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1084 | return -EFAULT; | |
1085 | return 0; | |
1086 | ||
1087 | case SIOCGIFENCAP: | |
1088 | if (put_user(sl->mode, p)) | |
1089 | return -EFAULT; | |
1090 | return 0; | |
1091 | ||
1092 | case SIOCSIFENCAP: | |
1093 | if (get_user(tmp, p)) | |
1094 | return -EFAULT; | |
1095 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1096 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1097 | return -EINVAL; |
1da177e4 LT |
1098 | #else |
1099 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1100 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1101 | /* return -EINVAL; */ |
1102 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1103 | #endif |
1104 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1105 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1106 | return -EINVAL; |
1da177e4 LT |
1107 | #endif |
1108 | sl->mode = tmp; | |
9ce6cf25 | 1109 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1110 | return 0; |
1111 | ||
9ce6cf25 | 1112 | case SIOCSIFHWADDR: |
1da177e4 LT |
1113 | return -EINVAL; |
1114 | ||
1115 | #ifdef CONFIG_SLIP_SMART | |
1116 | /* VSV changes start here */ | |
9ce6cf25 | 1117 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1118 | if (get_user(tmp, p)) |
1119 | return -EFAULT; | |
9ce6cf25 | 1120 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1121 | return -EINVAL; |
1122 | ||
1123 | spin_lock_bh(&sl->lock); | |
1124 | if (!sl->tty) { | |
1125 | spin_unlock_bh(&sl->lock); | |
1126 | return -ENODEV; | |
1127 | } | |
9ce6cf25 AC |
1128 | sl->keepalive = (u8)tmp; |
1129 | if (sl->keepalive != 0) { | |
1130 | mod_timer(&sl->keepalive_timer, | |
1131 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1132 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1133 | } else |
1134 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1135 | spin_unlock_bh(&sl->lock); |
1136 | return 0; | |
1137 | ||
9ce6cf25 | 1138 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1139 | if (put_user(sl->keepalive, p)) |
1140 | return -EFAULT; | |
1141 | return 0; | |
1142 | ||
9ce6cf25 | 1143 | case SIOCSOUTFILL: |
1da177e4 LT |
1144 | if (get_user(tmp, p)) |
1145 | return -EFAULT; | |
9ce6cf25 | 1146 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1147 | return -EINVAL; |
1148 | spin_lock_bh(&sl->lock); | |
1149 | if (!sl->tty) { | |
1150 | spin_unlock_bh(&sl->lock); | |
1151 | return -ENODEV; | |
1152 | } | |
9ce6cf25 AC |
1153 | sl->outfill = (u8)tmp; |
1154 | if (sl->outfill != 0) { | |
1155 | mod_timer(&sl->outfill_timer, | |
1156 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1157 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1158 | } else |
1159 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1160 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1161 | return 0; |
1da177e4 | 1162 | |
9ce6cf25 | 1163 | case SIOCGOUTFILL: |
1da177e4 LT |
1164 | if (put_user(sl->outfill, p)) |
1165 | return -EFAULT; | |
1166 | return 0; | |
1167 | /* VSV changes end */ | |
1168 | #endif | |
1da177e4 | 1169 | default: |
d0127539 | 1170 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1171 | } |
1172 | } | |
1173 | ||
9646e7ce AB |
1174 | #ifdef CONFIG_COMPAT |
1175 | static long slip_compat_ioctl(struct tty_struct *tty, struct file *file, | |
1176 | unsigned int cmd, unsigned long arg) | |
1177 | { | |
1178 | switch (cmd) { | |
1179 | case SIOCGIFNAME: | |
1180 | case SIOCGIFENCAP: | |
1181 | case SIOCSIFENCAP: | |
1182 | case SIOCSIFHWADDR: | |
1183 | case SIOCSKEEPALIVE: | |
1184 | case SIOCGKEEPALIVE: | |
1185 | case SIOCSOUTFILL: | |
1186 | case SIOCGOUTFILL: | |
1187 | return slip_ioctl(tty, file, cmd, | |
1188 | (unsigned long)compat_ptr(arg)); | |
1189 | } | |
1190 | ||
1191 | return -ENOIOCTLCMD; | |
1192 | } | |
1193 | #endif | |
1194 | ||
1da177e4 LT |
1195 | /* VSV changes start here */ |
1196 | #ifdef CONFIG_SLIP_SMART | |
1197 | /* function do_ioctl called from net/core/dev.c | |
1198 | to allow get/set outfill/keepalive parameter | |
1199 | by ifconfig */ | |
1200 | ||
9ce6cf25 | 1201 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1202 | { |
1203 | struct slip *sl = netdev_priv(dev); | |
1204 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1205 | ||
1206 | if (sl == NULL) /* Allocation failed ?? */ | |
1207 | return -ENODEV; | |
1208 | ||
1209 | spin_lock_bh(&sl->lock); | |
1210 | ||
1211 | if (!sl->tty) { | |
1212 | spin_unlock_bh(&sl->lock); | |
1213 | return -ENODEV; | |
1214 | } | |
1215 | ||
9ce6cf25 AC |
1216 | switch (cmd) { |
1217 | case SIOCSKEEPALIVE: | |
1da177e4 | 1218 | /* max for unchar */ |
9ce6cf25 | 1219 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1220 | spin_unlock_bh(&sl->lock); |
1221 | return -EINVAL; | |
1222 | } | |
9ce6cf25 | 1223 | sl->keepalive = (u8)*p; |
1da177e4 | 1224 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1225 | sl->keepalive_timer.expires = |
1226 | jiffies + sl->keepalive * HZ; | |
1227 | mod_timer(&sl->keepalive_timer, | |
1228 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1229 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1230 | } else |
1231 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1232 | break; |
1233 | ||
9ce6cf25 | 1234 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1235 | *p = sl->keepalive; |
1236 | break; | |
1237 | ||
9ce6cf25 AC |
1238 | case SIOCSOUTFILL: |
1239 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1240 | spin_unlock_bh(&sl->lock); |
1241 | return -EINVAL; | |
1242 | } | |
9ce6cf25 AC |
1243 | sl->outfill = (u8)*p; |
1244 | if (sl->outfill != 0) { | |
1245 | mod_timer(&sl->outfill_timer, | |
1246 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1247 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1248 | } else |
1249 | del_timer(&sl->outfill_timer); | |
1250 | break; | |
1da177e4 | 1251 | |
9ce6cf25 | 1252 | case SIOCGOUTFILL: |
1da177e4 LT |
1253 | *p = sl->outfill; |
1254 | break; | |
1255 | ||
9ce6cf25 | 1256 | case SIOCSLEASE: |
6aa20a22 | 1257 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1258 | and opened by another process device. |
1259 | */ | |
9ce6cf25 AC |
1260 | if (sl->tty != current->signal->tty && |
1261 | sl->pid != current->pid) { | |
1da177e4 LT |
1262 | spin_unlock_bh(&sl->lock); |
1263 | return -EPERM; | |
1264 | } | |
1265 | sl->leased = 0; | |
9ce6cf25 | 1266 | if (*p) |
1da177e4 | 1267 | sl->leased = 1; |
9ce6cf25 | 1268 | break; |
1da177e4 | 1269 | |
9ce6cf25 | 1270 | case SIOCGLEASE: |
1da177e4 | 1271 | *p = sl->leased; |
ee289b64 | 1272 | } |
1da177e4 LT |
1273 | spin_unlock_bh(&sl->lock); |
1274 | return 0; | |
1275 | } | |
1276 | #endif | |
1277 | /* VSV changes end */ | |
1278 | ||
a352def2 | 1279 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 LT |
1280 | .owner = THIS_MODULE, |
1281 | .magic = TTY_LDISC_MAGIC, | |
1282 | .name = "slip", | |
1283 | .open = slip_open, | |
1284 | .close = slip_close, | |
5342b77c | 1285 | .hangup = slip_hangup, |
1da177e4 | 1286 | .ioctl = slip_ioctl, |
9646e7ce AB |
1287 | #ifdef CONFIG_COMPAT |
1288 | .compat_ioctl = slip_compat_ioctl, | |
1289 | #endif | |
1da177e4 | 1290 | .receive_buf = slip_receive_buf, |
1da177e4 LT |
1291 | .write_wakeup = slip_write_wakeup, |
1292 | }; | |
1293 | ||
1294 | static int __init slip_init(void) | |
1295 | { | |
1296 | int status; | |
1297 | ||
1298 | if (slip_maxdev < 4) | |
1299 | slip_maxdev = 4; /* Sanity */ | |
1300 | ||
1301 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1302 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1303 | " (6 bit encapsulation enabled)" | |
1304 | #endif | |
1305 | ".\n", | |
9ce6cf25 | 1306 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1307 | #if defined(SL_INCLUDE_CSLIP) |
1308 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1309 | #endif | |
1310 | #ifdef CONFIG_SLIP_SMART | |
1311 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1312 | #endif | |
1313 | ||
9ce6cf25 AC |
1314 | slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev, |
1315 | GFP_KERNEL); | |
1da177e4 | 1316 | if (!slip_devs) { |
9ce6cf25 | 1317 | printk(KERN_ERR "SLIP: Can't allocate slip devices array.\n"); |
1da177e4 LT |
1318 | return -ENOMEM; |
1319 | } | |
1320 | ||
1da177e4 | 1321 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1322 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1323 | if (status != 0) { | |
1da177e4 LT |
1324 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1325 | kfree(slip_devs); | |
1326 | } | |
1327 | return status; | |
1328 | } | |
1329 | ||
1330 | static void __exit slip_exit(void) | |
1331 | { | |
1332 | int i; | |
1333 | struct net_device *dev; | |
1334 | struct slip *sl; | |
1335 | unsigned long timeout = jiffies + HZ; | |
1336 | int busy = 0; | |
1337 | ||
6aa20a22 | 1338 | if (slip_devs == NULL) |
1da177e4 LT |
1339 | return; |
1340 | ||
1341 | /* First of all: check for active disciplines and hangup them. | |
1342 | */ | |
1343 | do { | |
a9fc2510 NA |
1344 | if (busy) |
1345 | msleep_interruptible(100); | |
1da177e4 LT |
1346 | |
1347 | busy = 0; | |
1348 | for (i = 0; i < slip_maxdev; i++) { | |
1349 | dev = slip_devs[i]; | |
1350 | if (!dev) | |
1351 | continue; | |
1352 | sl = netdev_priv(dev); | |
1353 | spin_lock_bh(&sl->lock); | |
1354 | if (sl->tty) { | |
1355 | busy++; | |
1356 | tty_hangup(sl->tty); | |
1357 | } | |
1358 | spin_unlock_bh(&sl->lock); | |
1359 | } | |
1360 | } while (busy && time_before(jiffies, timeout)); | |
1361 | ||
5342b77c AC |
1362 | /* FIXME: hangup is async so we should wait when doing this second |
1363 | phase */ | |
1da177e4 LT |
1364 | |
1365 | for (i = 0; i < slip_maxdev; i++) { | |
1366 | dev = slip_devs[i]; | |
1367 | if (!dev) | |
1368 | continue; | |
1369 | slip_devs[i] = NULL; | |
1370 | ||
1371 | sl = netdev_priv(dev); | |
1372 | if (sl->tty) { | |
1373 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1374 | dev->name); | |
1375 | /* Intentionally leak the control block. */ | |
1376 | dev->destructor = NULL; | |
6aa20a22 | 1377 | } |
1da177e4 LT |
1378 | |
1379 | unregister_netdev(dev); | |
1380 | } | |
1381 | ||
1382 | kfree(slip_devs); | |
1383 | slip_devs = NULL; | |
1384 | ||
9ce6cf25 AC |
1385 | i = tty_unregister_ldisc(N_SLIP); |
1386 | if (i != 0) | |
1da177e4 | 1387 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1388 | } |
1389 | ||
1390 | module_init(slip_init); | |
1391 | module_exit(slip_exit); | |
1392 | ||
1393 | #ifdef CONFIG_SLIP_SMART | |
1394 | /* | |
1395 | * This is start of the code for multislip style line checking | |
1396 | * added by Stanislav Voronyi. All changes before marked VSV | |
1397 | */ | |
1398 | ||
1399 | static void sl_outfill(unsigned long sls) | |
1400 | { | |
9ce6cf25 | 1401 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1402 | |
1403 | spin_lock(&sl->lock); | |
1404 | ||
1405 | if (sl->tty == NULL) | |
1406 | goto out; | |
1407 | ||
9ce6cf25 AC |
1408 | if (sl->outfill) { |
1409 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1410 | /* no packets were transmitted, do outfill */ |
1411 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1412 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1413 | #else | |
1414 | unsigned char s = END; | |
1415 | #endif | |
1416 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1417 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1418 | /* if device busy no outfill */ |
f34d7a5b | 1419 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1420 | } |
9ce6cf25 | 1421 | } else |
1da177e4 LT |
1422 | set_bit(SLF_OUTWAIT, &sl->flags); |
1423 | ||
1424 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1425 | } | |
1426 | out: | |
1427 | spin_unlock(&sl->lock); | |
1428 | } | |
1429 | ||
1430 | static void sl_keepalive(unsigned long sls) | |
1431 | { | |
9ce6cf25 | 1432 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1433 | |
1434 | spin_lock(&sl->lock); | |
1435 | ||
1436 | if (sl->tty == NULL) | |
1437 | goto out; | |
1438 | ||
9ce6cf25 AC |
1439 | if (sl->keepalive) { |
1440 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1441 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1442 | if (sl->outfill) |
1443 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1444 | (void)del_timer(&sl->outfill_timer); |
1445 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1446 | /* this must hangup tty & close slip */ |
1447 | tty_hangup(sl->tty); | |
1da177e4 LT |
1448 | /* I think we need not something else */ |
1449 | goto out; | |
9ce6cf25 | 1450 | } else |
1da177e4 LT |
1451 | set_bit(SLF_KEEPTEST, &sl->flags); |
1452 | ||
1453 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1454 | } | |
1da177e4 LT |
1455 | out: |
1456 | spin_unlock(&sl->lock); | |
1457 | } | |
1458 | ||
1459 | #endif | |
1460 | MODULE_LICENSE("GPL"); | |
1461 | MODULE_ALIAS_LDISC(N_SLIP); |