Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * slip.c This module implements the SLIP protocol for kernel-based | |
4 | * devices like TTY. It interfaces between a raw TTY, and the | |
5 | * kernel's INET protocol layers. | |
6 | * | |
7 | * Version: @(#)slip.c 0.8.3 12/24/94 | |
8 | * | |
9 | * Authors: Laurence Culhane, <loz@holmes.demon.co.uk> | |
10 | * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> | |
11 | * | |
12 | * Fixes: | |
13 | * Alan Cox : Sanity checks and avoid tx overruns. | |
14 | * Has a new sl->mtu field. | |
9ce6cf25 AC |
15 | * Alan Cox : Found cause of overrun. ifconfig sl0 |
16 | * mtu upwards. Driver now spots this | |
17 | * and grows/shrinks its buffers(hack!). | |
18 | * Memory leak if you run out of memory | |
19 | * setting up a slip driver fixed. | |
1da177e4 LT |
20 | * Matt Dillon : Printable slip (borrowed from NET2E) |
21 | * Pauline Middelink : Slip driver fixes. | |
22 | * Alan Cox : Honours the old SL_COMPRESSED flag | |
23 | * Alan Cox : KISS AX.25 and AXUI IP support | |
24 | * Michael Riepe : Automatic CSLIP recognition added | |
25 | * Charles Hedrick : CSLIP header length problem fix. | |
26 | * Alan Cox : Corrected non-IP cases of the above. | |
27 | * Alan Cox : Now uses hardware type as per FvK. | |
28 | * Alan Cox : Default to 192.168.0.0 (RFC 1597) | |
29 | * A.N.Kuznetsov : dev_tint() recursion fix. | |
30 | * Dmitry Gorodchanin : SLIP memory leaks | |
31 | * Dmitry Gorodchanin : Code cleanup. Reduce tty driver | |
32 | * buffering from 4096 to 256 bytes. | |
33 | * Improving SLIP response time. | |
34 | * CONFIG_SLIP_MODE_SLIP6. | |
9ce6cf25 AC |
35 | * ifconfig sl? up & down now works |
36 | * correctly. | |
1da177e4 LT |
37 | * Modularization. |
38 | * Alan Cox : Oops - fix AX.25 buffer lengths | |
39 | * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP | |
40 | * statistics. Include CSLIP code only | |
41 | * if it really needed. | |
42 | * Alan Cox : Free slhc buffers in the right place. | |
43 | * Alan Cox : Allow for digipeated IP over AX.25 | |
44 | * Matti Aarnio : Dynamic SLIP devices, with ideas taken | |
45 | * from Jim Freeman's <jfree@caldera.com> | |
46 | * dynamic PPP devices. We do NOT kfree() | |
47 | * device entries, just reg./unreg. them | |
48 | * as they are needed. We kfree() them | |
49 | * at module cleanup. | |
9ce6cf25 AC |
50 | * With MODULE-loading ``insmod'', user |
51 | * can issue parameter: slip_maxdev=1024 | |
52 | * (Or how much he/she wants.. Default | |
53 | * is 256) | |
54 | * Stanislav Voronyi : Slip line checking, with ideas taken | |
55 | * from multislip BSDI driver which was | |
56 | * written by Igor Chechik, RELCOM Corp. | |
57 | * Only algorithms have been ported to | |
58 | * Linux SLIP driver. | |
1da177e4 | 59 | * Vitaly E. Lavrov : Sane behaviour on tty hangup. |
9ce6cf25 AC |
60 | * Alexey Kuznetsov : Cleanup interfaces to tty & netdevice |
61 | * modules. | |
1da177e4 LT |
62 | */ |
63 | ||
64 | #define SL_CHECK_TRANSMIT | |
76b5878c | 65 | #include <linux/compat.h> |
1da177e4 LT |
66 | #include <linux/module.h> |
67 | #include <linux/moduleparam.h> | |
68 | ||
7c0f6ba6 | 69 | #include <linux/uaccess.h> |
1da177e4 | 70 | #include <linux/bitops.h> |
3f07c014 | 71 | #include <linux/sched/signal.h> |
1da177e4 LT |
72 | #include <linux/string.h> |
73 | #include <linux/mm.h> | |
74 | #include <linux/interrupt.h> | |
75 | #include <linux/in.h> | |
76 | #include <linux/tty.h> | |
77 | #include <linux/errno.h> | |
78 | #include <linux/netdevice.h> | |
79 | #include <linux/etherdevice.h> | |
80 | #include <linux/skbuff.h> | |
81 | #include <linux/rtnetlink.h> | |
82 | #include <linux/if_arp.h> | |
83 | #include <linux/if_slip.h> | |
12dc2fdd | 84 | #include <linux/delay.h> |
1da177e4 | 85 | #include <linux/init.h> |
5a0e3ad6 | 86 | #include <linux/slab.h> |
661f7fda | 87 | #include <linux/workqueue.h> |
1da177e4 LT |
88 | #include "slip.h" |
89 | #ifdef CONFIG_INET | |
90 | #include <linux/ip.h> | |
91 | #include <linux/tcp.h> | |
92 | #include <net/slhc_vj.h> | |
93 | #endif | |
94 | ||
95 | #define SLIP_VERSION "0.8.4-NET3.019-NEWTTY" | |
96 | ||
97 | static struct net_device **slip_devs; | |
98 | ||
99 | static int slip_maxdev = SL_NRUNIT; | |
100 | module_param(slip_maxdev, int, 0); | |
101 | MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices"); | |
102 | ||
103 | static int slip_esc(unsigned char *p, unsigned char *d, int len); | |
104 | static void slip_unesc(struct slip *sl, unsigned char c); | |
105 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
106 | static int slip_esc6(unsigned char *p, unsigned char *d, int len); | |
107 | static void slip_unesc6(struct slip *sl, unsigned char c); | |
108 | #endif | |
109 | #ifdef CONFIG_SLIP_SMART | |
e99e88a9 KC |
110 | static void sl_keepalive(struct timer_list *t); |
111 | static void sl_outfill(struct timer_list *t); | |
76b5878c | 112 | static int sl_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd); |
1da177e4 LT |
113 | #endif |
114 | ||
115 | /******************************** | |
116 | * Buffer administration routines: | |
117 | * sl_alloc_bufs() | |
118 | * sl_free_bufs() | |
119 | * sl_realloc_bufs() | |
120 | * | |
121 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
122 | * sl_realloc_bufs provides strong atomicity and reallocation | |
123 | * on actively running device. | |
124 | *********************************/ | |
125 | ||
6aa20a22 | 126 | /* |
1da177e4 LT |
127 | Allocate channel buffers. |
128 | */ | |
129 | ||
9ce6cf25 | 130 | static int sl_alloc_bufs(struct slip *sl, int mtu) |
1da177e4 LT |
131 | { |
132 | int err = -ENOBUFS; | |
133 | unsigned long len; | |
9ce6cf25 AC |
134 | char *rbuff = NULL; |
135 | char *xbuff = NULL; | |
1da177e4 | 136 | #ifdef SL_INCLUDE_CSLIP |
9ce6cf25 | 137 | char *cbuff = NULL; |
1da177e4 LT |
138 | struct slcompress *slcomp = NULL; |
139 | #endif | |
140 | ||
141 | /* | |
142 | * Allocate the SLIP frame buffers: | |
143 | * | |
144 | * rbuff Receive buffer. | |
145 | * xbuff Transmit buffer. | |
146 | * cbuff Temporary compression buffer. | |
147 | */ | |
148 | len = mtu * 2; | |
149 | ||
150 | /* | |
151 | * allow for arrival of larger UDP packets, even if we say not to | |
152 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
153 | * an MSS of 128 | |
154 | */ | |
155 | if (len < 576 * 2) | |
156 | len = 576 * 2; | |
157 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
158 | if (rbuff == NULL) | |
159 | goto err_exit; | |
160 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
161 | if (xbuff == NULL) | |
162 | goto err_exit; | |
163 | #ifdef SL_INCLUDE_CSLIP | |
164 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
165 | if (cbuff == NULL) | |
166 | goto err_exit; | |
167 | slcomp = slhc_init(16, 16); | |
4ab42d78 | 168 | if (IS_ERR(slcomp)) |
1da177e4 LT |
169 | goto err_exit; |
170 | #endif | |
171 | spin_lock_bh(&sl->lock); | |
172 | if (sl->tty == NULL) { | |
173 | spin_unlock_bh(&sl->lock); | |
174 | err = -ENODEV; | |
175 | goto err_exit; | |
176 | } | |
177 | sl->mtu = mtu; | |
178 | sl->buffsize = len; | |
179 | sl->rcount = 0; | |
180 | sl->xleft = 0; | |
181 | rbuff = xchg(&sl->rbuff, rbuff); | |
182 | xbuff = xchg(&sl->xbuff, xbuff); | |
183 | #ifdef SL_INCLUDE_CSLIP | |
184 | cbuff = xchg(&sl->cbuff, cbuff); | |
185 | slcomp = xchg(&sl->slcomp, slcomp); | |
7686d1cc | 186 | #endif |
1da177e4 LT |
187 | #ifdef CONFIG_SLIP_MODE_SLIP6 |
188 | sl->xdata = 0; | |
189 | sl->xbits = 0; | |
1da177e4 LT |
190 | #endif |
191 | spin_unlock_bh(&sl->lock); | |
192 | err = 0; | |
193 | ||
194 | /* Cleanup */ | |
195 | err_exit: | |
196 | #ifdef SL_INCLUDE_CSLIP | |
158a0e45 | 197 | kfree(cbuff); |
30c5f8ec | 198 | slhc_free(slcomp); |
1da177e4 | 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 | |
e28634d6 | 251 | if (mtu > sl->mtu) { |
1da177e4 LT |
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; | |
034de00b | 274 | dev->stats.tx_dropped++; |
1da177e4 LT |
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; | |
034de00b | 284 | dev->stats.rx_over_errors++; |
1da177e4 LT |
285 | set_bit(SLF_ERROR, &sl->flags); |
286 | } | |
287 | } | |
288 | sl->mtu = mtu; | |
1eb2cded | 289 | WRITE_ONCE(dev->mtu, mtu); |
1da177e4 LT |
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 | 321 | { |
034de00b | 322 | struct net_device *dev = sl->dev; |
1da177e4 LT |
323 | struct sk_buff *skb; |
324 | int count; | |
325 | ||
326 | count = sl->rcount; | |
327 | #ifdef SL_INCLUDE_CSLIP | |
328 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
9ce6cf25 AC |
329 | unsigned char c = sl->rbuff[0]; |
330 | if (c & SL_TYPE_COMPRESSED_TCP) { | |
1da177e4 LT |
331 | /* ignore compressed packets when CSLIP is off */ |
332 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
034de00b | 333 | printk(KERN_WARNING "%s: compressed packet ignored\n", dev->name); |
1da177e4 LT |
334 | return; |
335 | } | |
9ce6cf25 AC |
336 | /* make sure we've reserved enough space for uncompress |
337 | to use */ | |
1da177e4 | 338 | if (count + 80 > sl->buffsize) { |
034de00b | 339 | dev->stats.rx_over_errors++; |
1da177e4 LT |
340 | return; |
341 | } | |
342 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
9ce6cf25 | 343 | if (count <= 0) |
1da177e4 | 344 | return; |
1da177e4 LT |
345 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { |
346 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
347 | /* turn on header compression */ | |
348 | sl->mode |= SL_MODE_CSLIP; | |
349 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
034de00b | 350 | printk(KERN_INFO "%s: header compression turned on\n", dev->name); |
1da177e4 LT |
351 | } |
352 | sl->rbuff[0] &= 0x4f; | |
9ce6cf25 | 353 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) |
1da177e4 | 354 | return; |
1da177e4 LT |
355 | } |
356 | } | |
357 | #endif /* SL_INCLUDE_CSLIP */ | |
358 | ||
034de00b | 359 | dev->stats.rx_bytes += count; |
6aa20a22 | 360 | |
1da177e4 | 361 | skb = dev_alloc_skb(count); |
9ce6cf25 | 362 | if (skb == NULL) { |
034de00b TK |
363 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name); |
364 | dev->stats.rx_dropped++; | |
1da177e4 LT |
365 | return; |
366 | } | |
034de00b | 367 | skb->dev = dev; |
59ae1d12 | 368 | skb_put_data(skb, sl->rbuff, count); |
98e399f8 | 369 | skb_reset_mac_header(skb); |
9ce6cf25 | 370 | skb->protocol = htons(ETH_P_IP); |
e77975e0 | 371 | netif_rx(skb); |
034de00b | 372 | dev->stats.rx_packets++; |
1da177e4 LT |
373 | } |
374 | ||
375 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
9ce6cf25 | 376 | static void sl_encaps(struct slip *sl, unsigned char *icp, int len) |
1da177e4 LT |
377 | { |
378 | unsigned char *p; | |
379 | int actual, count; | |
380 | ||
381 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
382 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
034de00b | 383 | sl->dev->stats.tx_dropped++; |
1da177e4 LT |
384 | sl_unlock(sl); |
385 | return; | |
386 | } | |
387 | ||
388 | p = icp; | |
389 | #ifdef SL_INCLUDE_CSLIP | |
9ce6cf25 | 390 | if (sl->mode & SL_MODE_CSLIP) |
1da177e4 | 391 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); |
1da177e4 LT |
392 | #endif |
393 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 394 | if (sl->mode & SL_MODE_SLIP6) |
c2fd03a0 | 395 | count = slip_esc6(p, sl->xbuff, len); |
1da177e4 LT |
396 | else |
397 | #endif | |
c2fd03a0 | 398 | count = slip_esc(p, sl->xbuff, len); |
1da177e4 LT |
399 | |
400 | /* Order of next two lines is *very* important. | |
401 | * When we are sending a little amount of data, | |
f34d7a5b | 402 | * the transfer may be completed inside the ops->write() |
1da177e4 LT |
403 | * routine, because it's running with interrupts enabled. |
404 | * In this case we *never* got WRITE_WAKEUP event, | |
405 | * if we did not request it before write operation. | |
406 | * 14 Oct 1994 Dmitry Gorodchanin. | |
407 | */ | |
8a1ec21e | 408 | set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
f34d7a5b | 409 | actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
1da177e4 | 410 | #ifdef SL_CHECK_TRANSMIT |
860e9538 | 411 | netif_trans_update(sl->dev); |
1da177e4 LT |
412 | #endif |
413 | sl->xleft = count - actual; | |
414 | sl->xhead = sl->xbuff + actual; | |
415 | #ifdef CONFIG_SLIP_SMART | |
416 | /* VSV */ | |
417 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
418 | #endif | |
419 | } | |
420 | ||
661f7fda TH |
421 | /* Write out any remaining transmit buffer. Scheduled when tty is writable */ |
422 | static void slip_transmit(struct work_struct *work) | |
1da177e4 | 423 | { |
661f7fda | 424 | struct slip *sl = container_of(work, struct slip, tx_work); |
1da177e4 | 425 | int actual; |
1da177e4 | 426 | |
661f7fda | 427 | spin_lock_bh(&sl->lock); |
1da177e4 | 428 | /* First make sure we're connected. */ |
661f7fda TH |
429 | if (!sl->tty || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) { |
430 | spin_unlock_bh(&sl->lock); | |
1da177e4 | 431 | return; |
661f7fda | 432 | } |
9ce6cf25 | 433 | |
1da177e4 LT |
434 | if (sl->xleft <= 0) { |
435 | /* Now serial buffer is almost free & we can start | |
436 | * transmission of another packet */ | |
034de00b | 437 | sl->dev->stats.tx_packets++; |
661f7fda | 438 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
ddcde142 | 439 | spin_unlock_bh(&sl->lock); |
1da177e4 LT |
440 | sl_unlock(sl); |
441 | return; | |
442 | } | |
443 | ||
661f7fda | 444 | actual = sl->tty->ops->write(sl->tty, sl->xhead, sl->xleft); |
1da177e4 LT |
445 | sl->xleft -= actual; |
446 | sl->xhead += actual; | |
ddcde142 | 447 | spin_unlock_bh(&sl->lock); |
1da177e4 LT |
448 | } |
449 | ||
661f7fda TH |
450 | /* |
451 | * Called by the driver when there's room for more data. | |
452 | * Schedule the transmit. | |
453 | */ | |
454 | static void slip_write_wakeup(struct tty_struct *tty) | |
455 | { | |
0ace17d5 RP |
456 | struct slip *sl; |
457 | ||
458 | rcu_read_lock(); | |
459 | sl = rcu_dereference(tty->disc_data); | |
dacf470b PM |
460 | if (sl) |
461 | schedule_work(&sl->tx_work); | |
0ace17d5 | 462 | rcu_read_unlock(); |
661f7fda TH |
463 | } |
464 | ||
0290bd29 | 465 | static void sl_tx_timeout(struct net_device *dev, unsigned int txqueue) |
1da177e4 LT |
466 | { |
467 | struct slip *sl = netdev_priv(dev); | |
468 | ||
469 | spin_lock(&sl->lock); | |
470 | ||
471 | if (netif_queue_stopped(dev)) { | |
ec4eb8a8 | 472 | if (!netif_running(dev) || !sl->tty) |
1da177e4 LT |
473 | goto out; |
474 | ||
475 | /* May be we must check transmitter timeout here ? | |
476 | * 14 Oct 1994 Dmitry Gorodchanin. | |
477 | */ | |
478 | #ifdef SL_CHECK_TRANSMIT | |
1ae5dc34 | 479 | if (time_before(jiffies, dev_trans_start(dev) + 20 * HZ)) { |
1da177e4 LT |
480 | /* 20 sec timeout not reached */ |
481 | goto out; | |
482 | } | |
9ce6cf25 AC |
483 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", |
484 | dev->name, | |
f34d7a5b | 485 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
9ce6cf25 | 486 | "bad line quality" : "driver error"); |
1da177e4 | 487 | sl->xleft = 0; |
8a1ec21e | 488 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
489 | sl_unlock(sl); |
490 | #endif | |
491 | } | |
1da177e4 LT |
492 | out: |
493 | spin_unlock(&sl->lock); | |
494 | } | |
495 | ||
496 | ||
497 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
424efe9c | 498 | static netdev_tx_t |
1da177e4 LT |
499 | sl_xmit(struct sk_buff *skb, struct net_device *dev) |
500 | { | |
501 | struct slip *sl = netdev_priv(dev); | |
502 | ||
503 | spin_lock(&sl->lock); | |
9ce6cf25 | 504 | if (!netif_running(dev)) { |
1da177e4 LT |
505 | spin_unlock(&sl->lock); |
506 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
507 | dev_kfree_skb(skb); | |
6ed10654 | 508 | return NETDEV_TX_OK; |
1da177e4 LT |
509 | } |
510 | if (sl->tty == NULL) { | |
511 | spin_unlock(&sl->lock); | |
512 | dev_kfree_skb(skb); | |
6ed10654 | 513 | return NETDEV_TX_OK; |
1da177e4 LT |
514 | } |
515 | ||
516 | sl_lock(sl); | |
034de00b | 517 | dev->stats.tx_bytes += skb->len; |
1da177e4 LT |
518 | sl_encaps(sl, skb->data, skb->len); |
519 | spin_unlock(&sl->lock); | |
520 | ||
521 | dev_kfree_skb(skb); | |
6ed10654 | 522 | return NETDEV_TX_OK; |
1da177e4 LT |
523 | } |
524 | ||
525 | ||
526 | /****************************************** | |
527 | * Routines looking at netdevice side. | |
528 | ******************************************/ | |
529 | ||
530 | /* Netdevice UP -> DOWN routine */ | |
531 | ||
532 | static int | |
533 | sl_close(struct net_device *dev) | |
534 | { | |
535 | struct slip *sl = netdev_priv(dev); | |
536 | ||
537 | spin_lock_bh(&sl->lock); | |
8a1ec21e | 538 | if (sl->tty) |
1da177e4 | 539 | /* TTY discipline is running. */ |
8a1ec21e | 540 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
541 | netif_stop_queue(dev); |
542 | sl->rcount = 0; | |
543 | sl->xleft = 0; | |
544 | spin_unlock_bh(&sl->lock); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | /* Netdevice DOWN -> UP routine */ | |
550 | ||
551 | static int sl_open(struct net_device *dev) | |
552 | { | |
553 | struct slip *sl = netdev_priv(dev); | |
554 | ||
9ce6cf25 | 555 | if (sl->tty == NULL) |
1da177e4 LT |
556 | return -ENODEV; |
557 | ||
558 | sl->flags &= (1 << SLF_INUSE); | |
559 | netif_start_queue(dev); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | /* Netdevice change MTU request */ | |
564 | ||
565 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
566 | { | |
567 | struct slip *sl = netdev_priv(dev); | |
568 | ||
b3e3893e | 569 | return sl_realloc_bufs(sl, new_mtu); |
1da177e4 LT |
570 | } |
571 | ||
572 | /* Netdevice get statistics request */ | |
573 | ||
bc1f4470 | 574 | static void |
034de00b | 575 | sl_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
1da177e4 | 576 | { |
034de00b | 577 | struct net_device_stats *devstats = &dev->stats; |
1da177e4 | 578 | #ifdef SL_INCLUDE_CSLIP |
034de00b | 579 | struct slip *sl = netdev_priv(dev); |
6f0bee16 | 580 | struct slcompress *comp = sl->slcomp; |
6f0bee16 | 581 | #endif |
034de00b TK |
582 | stats->rx_packets = devstats->rx_packets; |
583 | stats->tx_packets = devstats->tx_packets; | |
584 | stats->rx_bytes = devstats->rx_bytes; | |
585 | stats->tx_bytes = devstats->tx_bytes; | |
f3f70bf6 | 586 | stats->rx_dropped = devstats->rx_dropped; |
034de00b TK |
587 | stats->tx_dropped = devstats->tx_dropped; |
588 | stats->tx_errors = devstats->tx_errors; | |
589 | stats->rx_errors = devstats->rx_errors; | |
590 | stats->rx_over_errors = devstats->rx_over_errors; | |
6f0bee16 | 591 | |
f3f70bf6 MI |
592 | #ifdef SL_INCLUDE_CSLIP |
593 | if (comp) { | |
594 | /* Generic compressed statistics */ | |
595 | stats->rx_compressed = comp->sls_i_compressed; | |
596 | stats->tx_compressed = comp->sls_o_compressed; | |
597 | ||
598 | /* Are we really still needs this? */ | |
599 | stats->rx_fifo_errors += comp->sls_i_compressed; | |
600 | stats->rx_dropped += comp->sls_i_tossed; | |
601 | stats->tx_fifo_errors += comp->sls_o_compressed; | |
602 | stats->collisions += comp->sls_o_misses; | |
603 | } | |
604 | #endif | |
1da177e4 LT |
605 | } |
606 | ||
607 | /* Netdevice register callback */ | |
608 | ||
609 | static int sl_init(struct net_device *dev) | |
610 | { | |
611 | struct slip *sl = netdev_priv(dev); | |
612 | ||
613 | /* | |
6aa20a22 | 614 | * Finish setting up the DEVICE info. |
1da177e4 LT |
615 | */ |
616 | ||
617 | dev->mtu = sl->mtu; | |
618 | dev->type = ARPHRD_SLIP + sl->mode; | |
619 | #ifdef SL_CHECK_TRANSMIT | |
1da177e4 LT |
620 | dev->watchdog_timeo = 20*HZ; |
621 | #endif | |
622 | return 0; | |
623 | } | |
624 | ||
625 | ||
626 | static void sl_uninit(struct net_device *dev) | |
627 | { | |
628 | struct slip *sl = netdev_priv(dev); | |
629 | ||
630 | sl_free_bufs(sl); | |
631 | } | |
632 | ||
5342b77c AC |
633 | /* Hook the destructor so we can free slip devices at the right point in time */ |
634 | static void sl_free_netdev(struct net_device *dev) | |
635 | { | |
636 | int i = dev->base_addr; | |
cf124db5 | 637 | |
5342b77c AC |
638 | slip_devs[i] = NULL; |
639 | } | |
640 | ||
b1da683d SH |
641 | static const struct net_device_ops sl_netdev_ops = { |
642 | .ndo_init = sl_init, | |
643 | .ndo_uninit = sl_uninit, | |
644 | .ndo_open = sl_open, | |
645 | .ndo_stop = sl_close, | |
646 | .ndo_start_xmit = sl_xmit, | |
034de00b | 647 | .ndo_get_stats64 = sl_get_stats64, |
b1da683d SH |
648 | .ndo_change_mtu = sl_change_mtu, |
649 | .ndo_tx_timeout = sl_tx_timeout, | |
650 | #ifdef CONFIG_SLIP_SMART | |
76b5878c | 651 | .ndo_siocdevprivate = sl_siocdevprivate, |
b1da683d SH |
652 | #endif |
653 | }; | |
654 | ||
655 | ||
1da177e4 LT |
656 | static void sl_setup(struct net_device *dev) |
657 | { | |
b1da683d | 658 | dev->netdev_ops = &sl_netdev_ops; |
cf124db5 DM |
659 | dev->needs_free_netdev = true; |
660 | dev->priv_destructor = sl_free_netdev; | |
b1da683d | 661 | |
1da177e4 LT |
662 | dev->hard_header_len = 0; |
663 | dev->addr_len = 0; | |
664 | dev->tx_queue_len = 10; | |
665 | ||
b3e3893e JW |
666 | /* MTU range: 68 - 65534 */ |
667 | dev->min_mtu = 68; | |
668 | dev->max_mtu = 65534; | |
669 | ||
1da177e4 LT |
670 | /* New-style flags. */ |
671 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
672 | } | |
673 | ||
674 | /****************************************** | |
675 | Routines looking at TTY side. | |
676 | ******************************************/ | |
677 | ||
678 | ||
1da177e4 LT |
679 | /* |
680 | * Handle the 'receiver data ready' interrupt. | |
681 | * This function is called by the 'tty_io' module in the kernel when | |
682 | * a block of SLIP data has been received, which can now be decapsulated | |
683 | * and sent on to some IP layer for further processing. This will not | |
684 | * be re-entered while running but other ldisc functions may be called | |
685 | * in parallel | |
686 | */ | |
6aa20a22 | 687 | |
892bc209 JSS |
688 | static void slip_receive_buf(struct tty_struct *tty, const u8 *cp, const u8 *fp, |
689 | size_t count) | |
1da177e4 | 690 | { |
9ce6cf25 | 691 | struct slip *sl = tty->disc_data; |
1da177e4 | 692 | |
9ce6cf25 | 693 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
55db4c64 | 694 | return; |
1da177e4 LT |
695 | |
696 | /* Read the characters out of the buffer */ | |
55db4c64 | 697 | while (count--) { |
1da177e4 | 698 | if (fp && *fp++) { |
9ce6cf25 | 699 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
034de00b | 700 | sl->dev->stats.rx_errors++; |
1da177e4 LT |
701 | cp++; |
702 | continue; | |
703 | } | |
704 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
705 | if (sl->mode & SL_MODE_SLIP6) | |
706 | slip_unesc6(sl, *cp++); | |
707 | else | |
708 | #endif | |
709 | slip_unesc(sl, *cp++); | |
710 | } | |
711 | } | |
712 | ||
713 | /************************************ | |
714 | * slip_open helper routines. | |
715 | ************************************/ | |
716 | ||
717 | /* Collect hanged up channels */ | |
1da177e4 LT |
718 | static void sl_sync(void) |
719 | { | |
720 | int i; | |
721 | struct net_device *dev; | |
722 | struct slip *sl; | |
723 | ||
724 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
725 | dev = slip_devs[i]; |
726 | if (dev == NULL) | |
1da177e4 LT |
727 | break; |
728 | ||
729 | sl = netdev_priv(dev); | |
730 | if (sl->tty || sl->leased) | |
731 | continue; | |
9ce6cf25 | 732 | if (dev->flags & IFF_UP) |
1da177e4 LT |
733 | dev_close(dev); |
734 | } | |
735 | } | |
736 | ||
737 | ||
738 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
936e5d8b | 739 | static struct slip *sl_alloc(void) |
1da177e4 LT |
740 | { |
741 | int i; | |
390fd0b3 | 742 | char name[IFNAMSIZ]; |
1da177e4 LT |
743 | struct net_device *dev = NULL; |
744 | struct slip *sl; | |
745 | ||
1da177e4 LT |
746 | for (i = 0; i < slip_maxdev; i++) { |
747 | dev = slip_devs[i]; | |
748 | if (dev == NULL) | |
749 | break; | |
1da177e4 | 750 | } |
1da177e4 LT |
751 | /* Sorry, too many, all slots in use */ |
752 | if (i >= slip_maxdev) | |
753 | return NULL; | |
754 | ||
390fd0b3 | 755 | sprintf(name, "sl%d", i); |
c835a677 | 756 | dev = alloc_netdev(sizeof(*sl), name, NET_NAME_UNKNOWN, sl_setup); |
390fd0b3 MI |
757 | if (!dev) |
758 | return NULL; | |
1da177e4 | 759 | |
390fd0b3 | 760 | dev->base_addr = i; |
1da177e4 LT |
761 | sl = netdev_priv(dev); |
762 | ||
763 | /* Initialize channel control data */ | |
764 | sl->magic = SLIP_MAGIC; | |
765 | sl->dev = dev; | |
766 | spin_lock_init(&sl->lock); | |
661f7fda | 767 | INIT_WORK(&sl->tx_work, slip_transmit); |
1da177e4 LT |
768 | sl->mode = SL_MODE_DEFAULT; |
769 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 | 770 | /* initialize timer_list struct */ |
e99e88a9 KC |
771 | timer_setup(&sl->keepalive_timer, sl_keepalive, 0); |
772 | timer_setup(&sl->outfill_timer, sl_outfill, 0); | |
1da177e4 LT |
773 | #endif |
774 | slip_devs[i] = dev; | |
1da177e4 LT |
775 | return sl; |
776 | } | |
777 | ||
778 | /* | |
779 | * Open the high-level part of the SLIP channel. | |
780 | * This function is called by the TTY module when the | |
781 | * SLIP line discipline is called for. Because we are | |
782 | * sure the tty line exists, we only have to link it to | |
783 | * a free SLIP channel... | |
784 | * | |
785 | * Called in process context serialized from other ldisc calls. | |
786 | */ | |
787 | ||
788 | static int slip_open(struct tty_struct *tty) | |
789 | { | |
790 | struct slip *sl; | |
791 | int err; | |
792 | ||
9ce6cf25 | 793 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 794 | return -EPERM; |
6aa20a22 | 795 | |
f34d7a5b AC |
796 | if (tty->ops->write == NULL) |
797 | return -EOPNOTSUPP; | |
798 | ||
1da177e4 LT |
799 | /* RTnetlink lock is misused here to serialize concurrent |
800 | opens of slip channels. There are better ways, but it is | |
801 | the simplest one. | |
802 | */ | |
803 | rtnl_lock(); | |
804 | ||
805 | /* Collect hanged up channels. */ | |
806 | sl_sync(); | |
807 | ||
9ce6cf25 | 808 | sl = tty->disc_data; |
1da177e4 LT |
809 | |
810 | err = -EEXIST; | |
811 | /* First make sure we're not already connected. */ | |
812 | if (sl && sl->magic == SLIP_MAGIC) | |
813 | goto err_exit; | |
814 | ||
815 | /* OK. Find a free SLIP channel to use. */ | |
816 | err = -ENFILE; | |
936e5d8b | 817 | sl = sl_alloc(); |
9ce6cf25 | 818 | if (sl == NULL) |
1da177e4 LT |
819 | goto err_exit; |
820 | ||
821 | sl->tty = tty; | |
822 | tty->disc_data = sl; | |
1da177e4 | 823 | sl->pid = current->pid; |
6aa20a22 | 824 | |
1da177e4 LT |
825 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
826 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
827 | err = sl_alloc_bufs(sl, SL_MTU); |
828 | if (err) | |
1da177e4 LT |
829 | goto err_free_chan; |
830 | ||
831 | set_bit(SLF_INUSE, &sl->flags); | |
832 | ||
9ce6cf25 AC |
833 | err = register_netdevice(sl->dev); |
834 | if (err) | |
1da177e4 LT |
835 | goto err_free_bufs; |
836 | } | |
837 | ||
838 | #ifdef CONFIG_SLIP_SMART | |
839 | if (sl->keepalive) { | |
9ce6cf25 AC |
840 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
841 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
842 | } |
843 | if (sl->outfill) { | |
9ce6cf25 AC |
844 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
845 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
846 | } |
847 | #endif | |
848 | ||
849 | /* Done. We have linked the TTY line to a channel. */ | |
850 | rtnl_unlock(); | |
33f0f88f | 851 | tty->receive_room = 65536; /* We don't flow control */ |
057bef93 MI |
852 | |
853 | /* TTY layer expects 0 on success */ | |
854 | return 0; | |
1da177e4 LT |
855 | |
856 | err_free_bufs: | |
857 | sl_free_bufs(sl); | |
858 | ||
859 | err_free_chan: | |
860 | sl->tty = NULL; | |
861 | tty->disc_data = NULL; | |
862 | clear_bit(SLF_INUSE, &sl->flags); | |
e58c1912 | 863 | sl_free_netdev(sl->dev); |
f596c870 | 864 | /* do not call free_netdev before rtnl_unlock */ |
865 | rtnl_unlock(); | |
3b5a3997 | 866 | free_netdev(sl->dev); |
f596c870 | 867 | return err; |
1da177e4 LT |
868 | |
869 | err_exit: | |
870 | rtnl_unlock(); | |
871 | ||
872 | /* Count references from TTY module */ | |
873 | return err; | |
874 | } | |
875 | ||
1da177e4 LT |
876 | /* |
877 | * Close down a SLIP channel. | |
878 | * This means flushing out any pending queues, and then returning. This | |
879 | * call is serialized against other ldisc functions. | |
5342b77c AC |
880 | * |
881 | * We also use this method fo a hangup event | |
1da177e4 | 882 | */ |
5342b77c | 883 | |
9ce6cf25 | 884 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 885 | { |
9ce6cf25 | 886 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
887 | |
888 | /* First make sure we're connected. */ | |
889 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
890 | return; | |
891 | ||
661f7fda | 892 | spin_lock_bh(&sl->lock); |
0ace17d5 | 893 | rcu_assign_pointer(tty->disc_data, NULL); |
1da177e4 | 894 | sl->tty = NULL; |
661f7fda TH |
895 | spin_unlock_bh(&sl->lock); |
896 | ||
0ace17d5 | 897 | synchronize_rcu(); |
661f7fda | 898 | flush_work(&sl->tx_work); |
1da177e4 LT |
899 | |
900 | /* VSV = very important to remove timers */ | |
901 | #ifdef CONFIG_SLIP_SMART | |
902 | del_timer_sync(&sl->keepalive_timer); | |
903 | del_timer_sync(&sl->outfill_timer); | |
904 | #endif | |
5342b77c AC |
905 | /* Flush network side */ |
906 | unregister_netdev(sl->dev); | |
907 | /* This will complete via sl_free_netdev */ | |
1da177e4 LT |
908 | } |
909 | ||
28f194da | 910 | static void slip_hangup(struct tty_struct *tty) |
5342b77c AC |
911 | { |
912 | slip_close(tty); | |
5342b77c | 913 | } |
1da177e4 LT |
914 | /************************************************************************ |
915 | * STANDARD SLIP ENCAPSULATION * | |
916 | ************************************************************************/ | |
917 | ||
9ce6cf25 | 918 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
919 | { |
920 | unsigned char *ptr = d; | |
921 | unsigned char c; | |
922 | ||
923 | /* | |
924 | * Send an initial END character to flush out any | |
925 | * data that may have accumulated in the receiver | |
926 | * due to line noise. | |
927 | */ | |
928 | ||
929 | *ptr++ = END; | |
930 | ||
931 | /* | |
932 | * For each byte in the packet, send the appropriate | |
933 | * character sequence, according to the SLIP protocol. | |
934 | */ | |
935 | ||
936 | while (len-- > 0) { | |
9ce6cf25 AC |
937 | switch (c = *s++) { |
938 | case END: | |
1da177e4 LT |
939 | *ptr++ = ESC; |
940 | *ptr++ = ESC_END; | |
941 | break; | |
9ce6cf25 | 942 | case ESC: |
1da177e4 LT |
943 | *ptr++ = ESC; |
944 | *ptr++ = ESC_ESC; | |
945 | break; | |
9ce6cf25 | 946 | default: |
1da177e4 LT |
947 | *ptr++ = c; |
948 | break; | |
949 | } | |
950 | } | |
951 | *ptr++ = END; | |
807540ba | 952 | return ptr - d; |
1da177e4 LT |
953 | } |
954 | ||
955 | static void slip_unesc(struct slip *sl, unsigned char s) | |
956 | { | |
957 | ||
9ce6cf25 AC |
958 | switch (s) { |
959 | case END: | |
1da177e4 LT |
960 | #ifdef CONFIG_SLIP_SMART |
961 | /* drop keeptest bit = VSV */ | |
962 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
963 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
964 | #endif | |
965 | ||
8e95a202 JP |
966 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
967 | (sl->rcount > 2)) | |
1da177e4 | 968 | sl_bump(sl); |
1da177e4 LT |
969 | clear_bit(SLF_ESCAPE, &sl->flags); |
970 | sl->rcount = 0; | |
971 | return; | |
972 | ||
9ce6cf25 | 973 | case ESC: |
1da177e4 LT |
974 | set_bit(SLF_ESCAPE, &sl->flags); |
975 | return; | |
9ce6cf25 AC |
976 | case ESC_ESC: |
977 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 978 | s = ESC; |
1da177e4 | 979 | break; |
9ce6cf25 AC |
980 | case ESC_END: |
981 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 982 | s = END; |
1da177e4 LT |
983 | break; |
984 | } | |
985 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
986 | if (sl->rcount < sl->buffsize) { | |
987 | sl->rbuff[sl->rcount++] = s; | |
988 | return; | |
989 | } | |
034de00b | 990 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
991 | set_bit(SLF_ERROR, &sl->flags); |
992 | } | |
993 | } | |
994 | ||
995 | ||
996 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
997 | /************************************************************************ | |
998 | * 6 BIT SLIP ENCAPSULATION * | |
999 | ************************************************************************/ | |
1000 | ||
9ce6cf25 | 1001 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
1002 | { |
1003 | unsigned char *ptr = d; | |
1004 | unsigned char c; | |
1005 | int i; | |
1006 | unsigned short v = 0; | |
1007 | short bits = 0; | |
1008 | ||
1009 | /* | |
1010 | * Send an initial END character to flush out any | |
1011 | * data that may have accumulated in the receiver | |
1012 | * due to line noise. | |
1013 | */ | |
1014 | ||
1015 | *ptr++ = 0x70; | |
1016 | ||
1017 | /* | |
1018 | * Encode the packet into printable ascii characters | |
1019 | */ | |
1020 | ||
1021 | for (i = 0; i < len; ++i) { | |
1022 | v = (v << 8) | s[i]; | |
1023 | bits += 8; | |
1024 | while (bits >= 6) { | |
1025 | bits -= 6; | |
1026 | c = 0x30 + ((v >> bits) & 0x3F); | |
1027 | *ptr++ = c; | |
1028 | } | |
1029 | } | |
1030 | if (bits) { | |
1031 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1032 | *ptr++ = c; | |
1033 | } | |
1034 | *ptr++ = 0x70; | |
1035 | return ptr - d; | |
1036 | } | |
1037 | ||
9ce6cf25 | 1038 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1039 | { |
1040 | unsigned char c; | |
1041 | ||
1042 | if (s == 0x70) { | |
1043 | #ifdef CONFIG_SLIP_SMART | |
1044 | /* drop keeptest bit = VSV */ | |
1045 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1046 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1047 | #endif | |
1048 | ||
8e95a202 JP |
1049 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
1050 | (sl->rcount > 2)) | |
1da177e4 | 1051 | sl_bump(sl); |
1da177e4 LT |
1052 | sl->rcount = 0; |
1053 | sl->xbits = 0; | |
1054 | sl->xdata = 0; | |
9ce6cf25 | 1055 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1056 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1057 | sl->xbits += 6; | |
1058 | if (sl->xbits >= 8) { | |
1059 | sl->xbits -= 8; | |
1060 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1061 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1062 | if (sl->rcount < sl->buffsize) { | |
1063 | sl->rbuff[sl->rcount++] = c; | |
1064 | return; | |
1065 | } | |
034de00b | 1066 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
1067 | set_bit(SLF_ERROR, &sl->flags); |
1068 | } | |
1069 | } | |
9ce6cf25 | 1070 | } |
1da177e4 LT |
1071 | } |
1072 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1073 | ||
1074 | /* Perform I/O control on an active SLIP channel. */ | |
d78328bc JS |
1075 | static int slip_ioctl(struct tty_struct *tty, unsigned int cmd, |
1076 | unsigned long arg) | |
1da177e4 | 1077 | { |
9ce6cf25 | 1078 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1079 | unsigned int tmp; |
1080 | int __user *p = (int __user *)arg; | |
1081 | ||
1082 | /* First make sure we're connected. */ | |
9ce6cf25 | 1083 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1084 | return -EINVAL; |
1da177e4 | 1085 | |
9ce6cf25 AC |
1086 | switch (cmd) { |
1087 | case SIOCGIFNAME: | |
1da177e4 LT |
1088 | tmp = strlen(sl->dev->name) + 1; |
1089 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1090 | return -EFAULT; | |
1091 | return 0; | |
1092 | ||
1093 | case SIOCGIFENCAP: | |
1094 | if (put_user(sl->mode, p)) | |
1095 | return -EFAULT; | |
1096 | return 0; | |
1097 | ||
1098 | case SIOCSIFENCAP: | |
1099 | if (get_user(tmp, p)) | |
1100 | return -EFAULT; | |
1101 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1102 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1103 | return -EINVAL; |
1da177e4 LT |
1104 | #else |
1105 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1106 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1107 | /* return -EINVAL; */ |
1108 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1109 | #endif |
1110 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1111 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1112 | return -EINVAL; |
1da177e4 LT |
1113 | #endif |
1114 | sl->mode = tmp; | |
9ce6cf25 | 1115 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1116 | return 0; |
1117 | ||
9ce6cf25 | 1118 | case SIOCSIFHWADDR: |
1da177e4 LT |
1119 | return -EINVAL; |
1120 | ||
1121 | #ifdef CONFIG_SLIP_SMART | |
1122 | /* VSV changes start here */ | |
9ce6cf25 | 1123 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1124 | if (get_user(tmp, p)) |
1125 | return -EFAULT; | |
9ce6cf25 | 1126 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1127 | return -EINVAL; |
1128 | ||
1129 | spin_lock_bh(&sl->lock); | |
1130 | if (!sl->tty) { | |
1131 | spin_unlock_bh(&sl->lock); | |
1132 | return -ENODEV; | |
1133 | } | |
9ce6cf25 AC |
1134 | sl->keepalive = (u8)tmp; |
1135 | if (sl->keepalive != 0) { | |
1136 | mod_timer(&sl->keepalive_timer, | |
1137 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1138 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1139 | } else |
1140 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1141 | spin_unlock_bh(&sl->lock); |
1142 | return 0; | |
1143 | ||
9ce6cf25 | 1144 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1145 | if (put_user(sl->keepalive, p)) |
1146 | return -EFAULT; | |
1147 | return 0; | |
1148 | ||
9ce6cf25 | 1149 | case SIOCSOUTFILL: |
1da177e4 LT |
1150 | if (get_user(tmp, p)) |
1151 | return -EFAULT; | |
9ce6cf25 | 1152 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1153 | return -EINVAL; |
1154 | spin_lock_bh(&sl->lock); | |
1155 | if (!sl->tty) { | |
1156 | spin_unlock_bh(&sl->lock); | |
1157 | return -ENODEV; | |
1158 | } | |
9ce6cf25 AC |
1159 | sl->outfill = (u8)tmp; |
1160 | if (sl->outfill != 0) { | |
1161 | mod_timer(&sl->outfill_timer, | |
1162 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1163 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1164 | } else |
1165 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1166 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1167 | return 0; |
1da177e4 | 1168 | |
9ce6cf25 | 1169 | case SIOCGOUTFILL: |
1da177e4 LT |
1170 | if (put_user(sl->outfill, p)) |
1171 | return -EFAULT; | |
1172 | return 0; | |
1173 | /* VSV changes end */ | |
1174 | #endif | |
1da177e4 | 1175 | default: |
dcc223e8 | 1176 | return tty_mode_ioctl(tty, cmd, arg); |
1da177e4 LT |
1177 | } |
1178 | } | |
1179 | ||
1180 | /* VSV changes start here */ | |
1181 | #ifdef CONFIG_SLIP_SMART | |
76b5878c | 1182 | /* function sl_siocdevprivate called from net/core/dev.c |
1da177e4 LT |
1183 | to allow get/set outfill/keepalive parameter |
1184 | by ifconfig */ | |
1185 | ||
76b5878c AB |
1186 | static int sl_siocdevprivate(struct net_device *dev, struct ifreq *rq, |
1187 | void __user *data, int cmd) | |
1da177e4 LT |
1188 | { |
1189 | struct slip *sl = netdev_priv(dev); | |
1190 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1191 | ||
1192 | if (sl == NULL) /* Allocation failed ?? */ | |
1193 | return -ENODEV; | |
1194 | ||
76b5878c AB |
1195 | if (in_compat_syscall()) |
1196 | return -EOPNOTSUPP; | |
1197 | ||
1da177e4 LT |
1198 | spin_lock_bh(&sl->lock); |
1199 | ||
1200 | if (!sl->tty) { | |
1201 | spin_unlock_bh(&sl->lock); | |
1202 | return -ENODEV; | |
1203 | } | |
1204 | ||
9ce6cf25 AC |
1205 | switch (cmd) { |
1206 | case SIOCSKEEPALIVE: | |
1da177e4 | 1207 | /* max for unchar */ |
9ce6cf25 | 1208 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1209 | spin_unlock_bh(&sl->lock); |
1210 | return -EINVAL; | |
1211 | } | |
9ce6cf25 | 1212 | sl->keepalive = (u8)*p; |
1da177e4 | 1213 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1214 | sl->keepalive_timer.expires = |
1215 | jiffies + sl->keepalive * HZ; | |
1216 | mod_timer(&sl->keepalive_timer, | |
1217 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1218 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1219 | } else |
1220 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1221 | break; |
1222 | ||
9ce6cf25 | 1223 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1224 | *p = sl->keepalive; |
1225 | break; | |
1226 | ||
9ce6cf25 AC |
1227 | case SIOCSOUTFILL: |
1228 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1229 | spin_unlock_bh(&sl->lock); |
1230 | return -EINVAL; | |
1231 | } | |
9ce6cf25 AC |
1232 | sl->outfill = (u8)*p; |
1233 | if (sl->outfill != 0) { | |
1234 | mod_timer(&sl->outfill_timer, | |
1235 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1236 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1237 | } else |
1238 | del_timer(&sl->outfill_timer); | |
1239 | break; | |
1da177e4 | 1240 | |
9ce6cf25 | 1241 | case SIOCGOUTFILL: |
1da177e4 LT |
1242 | *p = sl->outfill; |
1243 | break; | |
1244 | ||
9ce6cf25 | 1245 | case SIOCSLEASE: |
6aa20a22 | 1246 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1247 | and opened by another process device. |
1248 | */ | |
9ce6cf25 AC |
1249 | if (sl->tty != current->signal->tty && |
1250 | sl->pid != current->pid) { | |
1da177e4 LT |
1251 | spin_unlock_bh(&sl->lock); |
1252 | return -EPERM; | |
1253 | } | |
1254 | sl->leased = 0; | |
9ce6cf25 | 1255 | if (*p) |
1da177e4 | 1256 | sl->leased = 1; |
9ce6cf25 | 1257 | break; |
1da177e4 | 1258 | |
9ce6cf25 | 1259 | case SIOCGLEASE: |
1da177e4 | 1260 | *p = sl->leased; |
ee289b64 | 1261 | } |
1da177e4 LT |
1262 | spin_unlock_bh(&sl->lock); |
1263 | return 0; | |
1264 | } | |
1265 | #endif | |
1266 | /* VSV changes end */ | |
1267 | ||
a352def2 | 1268 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 | 1269 | .owner = THIS_MODULE, |
fbadf70a | 1270 | .num = N_SLIP, |
1da177e4 LT |
1271 | .name = "slip", |
1272 | .open = slip_open, | |
1273 | .close = slip_close, | |
5342b77c | 1274 | .hangup = slip_hangup, |
1da177e4 LT |
1275 | .ioctl = slip_ioctl, |
1276 | .receive_buf = slip_receive_buf, | |
1da177e4 LT |
1277 | .write_wakeup = slip_write_wakeup, |
1278 | }; | |
1279 | ||
1280 | static int __init slip_init(void) | |
1281 | { | |
1282 | int status; | |
1283 | ||
1284 | if (slip_maxdev < 4) | |
1285 | slip_maxdev = 4; /* Sanity */ | |
1286 | ||
1287 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1288 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1289 | " (6 bit encapsulation enabled)" | |
1290 | #endif | |
1291 | ".\n", | |
9ce6cf25 | 1292 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1293 | #if defined(SL_INCLUDE_CSLIP) |
1294 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1295 | #endif | |
1296 | #ifdef CONFIG_SLIP_SMART | |
1297 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1298 | #endif | |
1299 | ||
6396bb22 | 1300 | slip_devs = kcalloc(slip_maxdev, sizeof(struct net_device *), |
9ce6cf25 | 1301 | GFP_KERNEL); |
e404decb | 1302 | if (!slip_devs) |
1da177e4 | 1303 | return -ENOMEM; |
1da177e4 | 1304 | |
1da177e4 | 1305 | /* Fill in our line protocol discipline, and register it */ |
fbadf70a | 1306 | status = tty_register_ldisc(&sl_ldisc); |
9ce6cf25 | 1307 | if (status != 0) { |
1da177e4 LT |
1308 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1309 | kfree(slip_devs); | |
1310 | } | |
1311 | return status; | |
1312 | } | |
1313 | ||
1314 | static void __exit slip_exit(void) | |
1315 | { | |
1316 | int i; | |
1317 | struct net_device *dev; | |
1318 | struct slip *sl; | |
1319 | unsigned long timeout = jiffies + HZ; | |
1320 | int busy = 0; | |
1321 | ||
6aa20a22 | 1322 | if (slip_devs == NULL) |
1da177e4 LT |
1323 | return; |
1324 | ||
1325 | /* First of all: check for active disciplines and hangup them. | |
1326 | */ | |
1327 | do { | |
a9fc2510 NA |
1328 | if (busy) |
1329 | msleep_interruptible(100); | |
1da177e4 LT |
1330 | |
1331 | busy = 0; | |
1332 | for (i = 0; i < slip_maxdev; i++) { | |
1333 | dev = slip_devs[i]; | |
1334 | if (!dev) | |
1335 | continue; | |
1336 | sl = netdev_priv(dev); | |
1337 | spin_lock_bh(&sl->lock); | |
1338 | if (sl->tty) { | |
1339 | busy++; | |
1340 | tty_hangup(sl->tty); | |
1341 | } | |
1342 | spin_unlock_bh(&sl->lock); | |
1343 | } | |
1344 | } while (busy && time_before(jiffies, timeout)); | |
1345 | ||
5342b77c AC |
1346 | /* FIXME: hangup is async so we should wait when doing this second |
1347 | phase */ | |
1da177e4 LT |
1348 | |
1349 | for (i = 0; i < slip_maxdev; i++) { | |
1350 | dev = slip_devs[i]; | |
1351 | if (!dev) | |
1352 | continue; | |
1353 | slip_devs[i] = NULL; | |
1354 | ||
1355 | sl = netdev_priv(dev); | |
1356 | if (sl->tty) { | |
1357 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1358 | dev->name); | |
6aa20a22 | 1359 | } |
1da177e4 LT |
1360 | |
1361 | unregister_netdev(dev); | |
1362 | } | |
1363 | ||
1364 | kfree(slip_devs); | |
1365 | slip_devs = NULL; | |
1366 | ||
357a6a87 | 1367 | tty_unregister_ldisc(&sl_ldisc); |
1da177e4 LT |
1368 | } |
1369 | ||
1370 | module_init(slip_init); | |
1371 | module_exit(slip_exit); | |
1372 | ||
1373 | #ifdef CONFIG_SLIP_SMART | |
1374 | /* | |
1375 | * This is start of the code for multislip style line checking | |
1376 | * added by Stanislav Voronyi. All changes before marked VSV | |
1377 | */ | |
1378 | ||
e99e88a9 | 1379 | static void sl_outfill(struct timer_list *t) |
1da177e4 | 1380 | { |
e99e88a9 | 1381 | struct slip *sl = from_timer(sl, t, outfill_timer); |
1da177e4 LT |
1382 | |
1383 | spin_lock(&sl->lock); | |
1384 | ||
1385 | if (sl->tty == NULL) | |
1386 | goto out; | |
1387 | ||
9ce6cf25 AC |
1388 | if (sl->outfill) { |
1389 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1390 | /* no packets were transmitted, do outfill */ |
1391 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1392 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1393 | #else | |
1394 | unsigned char s = END; | |
1395 | #endif | |
1396 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1397 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1398 | /* if device busy no outfill */ |
f34d7a5b | 1399 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1400 | } |
9ce6cf25 | 1401 | } else |
1da177e4 LT |
1402 | set_bit(SLF_OUTWAIT, &sl->flags); |
1403 | ||
1404 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1405 | } | |
1406 | out: | |
1407 | spin_unlock(&sl->lock); | |
1408 | } | |
1409 | ||
e99e88a9 | 1410 | static void sl_keepalive(struct timer_list *t) |
1da177e4 | 1411 | { |
e99e88a9 | 1412 | struct slip *sl = from_timer(sl, t, keepalive_timer); |
1da177e4 LT |
1413 | |
1414 | spin_lock(&sl->lock); | |
1415 | ||
1416 | if (sl->tty == NULL) | |
1417 | goto out; | |
1418 | ||
9ce6cf25 AC |
1419 | if (sl->keepalive) { |
1420 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1421 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1422 | if (sl->outfill) |
1423 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1424 | (void)del_timer(&sl->outfill_timer); |
1425 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1426 | /* this must hangup tty & close slip */ |
1427 | tty_hangup(sl->tty); | |
1da177e4 LT |
1428 | /* I think we need not something else */ |
1429 | goto out; | |
9ce6cf25 | 1430 | } else |
1da177e4 LT |
1431 | set_bit(SLF_KEEPTEST, &sl->flags); |
1432 | ||
1433 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1434 | } | |
1da177e4 LT |
1435 | out: |
1436 | spin_unlock(&sl->lock); | |
1437 | } | |
1438 | ||
1439 | #endif | |
e1b1d282 | 1440 | MODULE_DESCRIPTION("SLIP (serial line) protocol module"); |
1da177e4 LT |
1441 | MODULE_LICENSE("GPL"); |
1442 | MODULE_ALIAS_LDISC(N_SLIP); |