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 | |
1da177e4 LT |
65 | #include <linux/module.h> |
66 | #include <linux/moduleparam.h> | |
67 | ||
7c0f6ba6 | 68 | #include <linux/uaccess.h> |
1da177e4 | 69 | #include <linux/bitops.h> |
3f07c014 | 70 | #include <linux/sched/signal.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> | |
12dc2fdd | 83 | #include <linux/delay.h> |
1da177e4 | 84 | #include <linux/init.h> |
5a0e3ad6 | 85 | #include <linux/slab.h> |
661f7fda | 86 | #include <linux/workqueue.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 | |
e99e88a9 KC |
109 | static void sl_keepalive(struct timer_list *t); |
110 | static void sl_outfill(struct timer_list *t); | |
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); | |
4ab42d78 | 167 | if (IS_ERR(slcomp)) |
1da177e4 LT |
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); | |
7686d1cc | 185 | #endif |
1da177e4 LT |
186 | #ifdef CONFIG_SLIP_MODE_SLIP6 |
187 | sl->xdata = 0; | |
188 | sl->xbits = 0; | |
1da177e4 LT |
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); |
30c5f8ec | 197 | slhc_free(slcomp); |
1da177e4 | 198 | #endif |
158a0e45 JJ |
199 | kfree(xbuff); |
200 | kfree(rbuff); | |
1da177e4 LT |
201 | return err; |
202 | } | |
203 | ||
204 | /* Free a SLIP channel buffers. */ | |
9ce6cf25 | 205 | static void sl_free_bufs(struct slip *sl) |
1da177e4 | 206 | { |
1da177e4 | 207 | /* Free all SLIP frame buffers. */ |
9b200b02 JJ |
208 | kfree(xchg(&sl->rbuff, NULL)); |
209 | kfree(xchg(&sl->xbuff, NULL)); | |
1da177e4 | 210 | #ifdef SL_INCLUDE_CSLIP |
9b200b02 JJ |
211 | kfree(xchg(&sl->cbuff, NULL)); |
212 | slhc_free(xchg(&sl->slcomp, NULL)); | |
1da177e4 LT |
213 | #endif |
214 | } | |
215 | ||
6aa20a22 | 216 | /* |
1da177e4 LT |
217 | Reallocate slip channel buffers. |
218 | */ | |
219 | ||
220 | static int sl_realloc_bufs(struct slip *sl, int mtu) | |
221 | { | |
222 | int err = 0; | |
223 | struct net_device *dev = sl->dev; | |
224 | unsigned char *xbuff, *rbuff; | |
225 | #ifdef SL_INCLUDE_CSLIP | |
226 | unsigned char *cbuff; | |
227 | #endif | |
228 | int len = mtu * 2; | |
229 | ||
230 | /* | |
231 | * allow for arrival of larger UDP packets, even if we say not to | |
232 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
233 | * an MSS of 128 | |
234 | */ | |
235 | if (len < 576 * 2) | |
236 | len = 576 * 2; | |
237 | ||
5cbded58 RD |
238 | xbuff = kmalloc(len + 4, GFP_ATOMIC); |
239 | rbuff = kmalloc(len + 4, GFP_ATOMIC); | |
1da177e4 | 240 | #ifdef SL_INCLUDE_CSLIP |
5cbded58 | 241 | cbuff = kmalloc(len + 4, GFP_ATOMIC); |
1da177e4 LT |
242 | #endif |
243 | ||
244 | ||
245 | #ifdef SL_INCLUDE_CSLIP | |
246 | if (xbuff == NULL || rbuff == NULL || cbuff == NULL) { | |
247 | #else | |
248 | if (xbuff == NULL || rbuff == NULL) { | |
249 | #endif | |
e28634d6 | 250 | if (mtu > sl->mtu) { |
1da177e4 LT |
251 | printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n", |
252 | dev->name); | |
253 | err = -ENOBUFS; | |
254 | } | |
255 | goto done; | |
256 | } | |
1da177e4 LT |
257 | spin_lock_bh(&sl->lock); |
258 | ||
259 | err = -ENODEV; | |
260 | if (sl->tty == NULL) | |
261 | goto done_on_bh; | |
262 | ||
263 | xbuff = xchg(&sl->xbuff, xbuff); | |
264 | rbuff = xchg(&sl->rbuff, rbuff); | |
265 | #ifdef SL_INCLUDE_CSLIP | |
266 | cbuff = xchg(&sl->cbuff, cbuff); | |
267 | #endif | |
268 | if (sl->xleft) { | |
269 | if (sl->xleft <= len) { | |
270 | memcpy(sl->xbuff, sl->xhead, sl->xleft); | |
271 | } else { | |
272 | sl->xleft = 0; | |
034de00b | 273 | dev->stats.tx_dropped++; |
1da177e4 LT |
274 | } |
275 | } | |
276 | sl->xhead = sl->xbuff; | |
277 | ||
278 | if (sl->rcount) { | |
279 | if (sl->rcount <= len) { | |
280 | memcpy(sl->rbuff, rbuff, sl->rcount); | |
281 | } else { | |
282 | sl->rcount = 0; | |
034de00b | 283 | dev->stats.rx_over_errors++; |
1da177e4 LT |
284 | set_bit(SLF_ERROR, &sl->flags); |
285 | } | |
286 | } | |
287 | sl->mtu = mtu; | |
288 | dev->mtu = mtu; | |
289 | sl->buffsize = len; | |
290 | err = 0; | |
291 | ||
292 | done_on_bh: | |
293 | spin_unlock_bh(&sl->lock); | |
294 | ||
295 | done: | |
158a0e45 JJ |
296 | kfree(xbuff); |
297 | kfree(rbuff); | |
1da177e4 | 298 | #ifdef SL_INCLUDE_CSLIP |
158a0e45 | 299 | kfree(cbuff); |
1da177e4 LT |
300 | #endif |
301 | return err; | |
302 | } | |
303 | ||
304 | ||
305 | /* Set the "sending" flag. This must be atomic hence the set_bit. */ | |
9ce6cf25 | 306 | static inline void sl_lock(struct slip *sl) |
1da177e4 LT |
307 | { |
308 | netif_stop_queue(sl->dev); | |
309 | } | |
310 | ||
311 | ||
312 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ | |
9ce6cf25 | 313 | static inline void sl_unlock(struct slip *sl) |
1da177e4 LT |
314 | { |
315 | netif_wake_queue(sl->dev); | |
316 | } | |
317 | ||
318 | /* Send one completely decapsulated IP datagram to the IP layer. */ | |
9ce6cf25 | 319 | static void sl_bump(struct slip *sl) |
1da177e4 | 320 | { |
034de00b | 321 | struct net_device *dev = sl->dev; |
1da177e4 LT |
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)) { | |
034de00b | 332 | printk(KERN_WARNING "%s: compressed packet ignored\n", dev->name); |
1da177e4 LT |
333 | return; |
334 | } | |
9ce6cf25 AC |
335 | /* make sure we've reserved enough space for uncompress |
336 | to use */ | |
1da177e4 | 337 | if (count + 80 > sl->buffsize) { |
034de00b | 338 | dev->stats.rx_over_errors++; |
1da177e4 LT |
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; | |
034de00b | 349 | printk(KERN_INFO "%s: header compression turned on\n", dev->name); |
1da177e4 LT |
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 | ||
034de00b | 358 | dev->stats.rx_bytes += count; |
6aa20a22 | 359 | |
1da177e4 | 360 | skb = dev_alloc_skb(count); |
9ce6cf25 | 361 | if (skb == NULL) { |
034de00b TK |
362 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name); |
363 | dev->stats.rx_dropped++; | |
1da177e4 LT |
364 | return; |
365 | } | |
034de00b | 366 | skb->dev = dev; |
59ae1d12 | 367 | skb_put_data(skb, sl->rbuff, count); |
98e399f8 | 368 | skb_reset_mac_header(skb); |
9ce6cf25 | 369 | skb->protocol = htons(ETH_P_IP); |
61485160 | 370 | netif_rx_ni(skb); |
034de00b | 371 | dev->stats.rx_packets++; |
1da177e4 LT |
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); | |
034de00b | 382 | sl->dev->stats.tx_dropped++; |
1da177e4 LT |
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) |
c2fd03a0 | 394 | count = slip_esc6(p, sl->xbuff, len); |
1da177e4 LT |
395 | else |
396 | #endif | |
c2fd03a0 | 397 | count = slip_esc(p, sl->xbuff, len); |
1da177e4 LT |
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 | 409 | #ifdef SL_CHECK_TRANSMIT |
860e9538 | 410 | netif_trans_update(sl->dev); |
1da177e4 LT |
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 | ||
661f7fda TH |
420 | /* Write out any remaining transmit buffer. Scheduled when tty is writable */ |
421 | static void slip_transmit(struct work_struct *work) | |
1da177e4 | 422 | { |
661f7fda | 423 | struct slip *sl = container_of(work, struct slip, tx_work); |
1da177e4 | 424 | int actual; |
1da177e4 | 425 | |
661f7fda | 426 | spin_lock_bh(&sl->lock); |
1da177e4 | 427 | /* First make sure we're connected. */ |
661f7fda TH |
428 | if (!sl->tty || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) { |
429 | spin_unlock_bh(&sl->lock); | |
1da177e4 | 430 | return; |
661f7fda | 431 | } |
9ce6cf25 | 432 | |
1da177e4 LT |
433 | if (sl->xleft <= 0) { |
434 | /* Now serial buffer is almost free & we can start | |
435 | * transmission of another packet */ | |
034de00b | 436 | sl->dev->stats.tx_packets++; |
661f7fda | 437 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
ddcde142 | 438 | spin_unlock_bh(&sl->lock); |
1da177e4 LT |
439 | sl_unlock(sl); |
440 | return; | |
441 | } | |
442 | ||
661f7fda | 443 | actual = sl->tty->ops->write(sl->tty, sl->xhead, sl->xleft); |
1da177e4 LT |
444 | sl->xleft -= actual; |
445 | sl->xhead += actual; | |
ddcde142 | 446 | spin_unlock_bh(&sl->lock); |
1da177e4 LT |
447 | } |
448 | ||
661f7fda TH |
449 | /* |
450 | * Called by the driver when there's room for more data. | |
451 | * Schedule the transmit. | |
452 | */ | |
453 | static void slip_write_wakeup(struct tty_struct *tty) | |
454 | { | |
455 | struct slip *sl = tty->disc_data; | |
456 | ||
457 | schedule_work(&sl->tx_work); | |
458 | } | |
459 | ||
1da177e4 LT |
460 | static void sl_tx_timeout(struct net_device *dev) |
461 | { | |
462 | struct slip *sl = netdev_priv(dev); | |
463 | ||
464 | spin_lock(&sl->lock); | |
465 | ||
466 | if (netif_queue_stopped(dev)) { | |
467 | if (!netif_running(dev)) | |
468 | goto out; | |
469 | ||
470 | /* May be we must check transmitter timeout here ? | |
471 | * 14 Oct 1994 Dmitry Gorodchanin. | |
472 | */ | |
473 | #ifdef SL_CHECK_TRANSMIT | |
1ae5dc34 | 474 | if (time_before(jiffies, dev_trans_start(dev) + 20 * HZ)) { |
1da177e4 LT |
475 | /* 20 sec timeout not reached */ |
476 | goto out; | |
477 | } | |
9ce6cf25 AC |
478 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", |
479 | dev->name, | |
f34d7a5b | 480 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
9ce6cf25 | 481 | "bad line quality" : "driver error"); |
1da177e4 | 482 | sl->xleft = 0; |
8a1ec21e | 483 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
484 | sl_unlock(sl); |
485 | #endif | |
486 | } | |
1da177e4 LT |
487 | out: |
488 | spin_unlock(&sl->lock); | |
489 | } | |
490 | ||
491 | ||
492 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
424efe9c | 493 | static netdev_tx_t |
1da177e4 LT |
494 | sl_xmit(struct sk_buff *skb, struct net_device *dev) |
495 | { | |
496 | struct slip *sl = netdev_priv(dev); | |
497 | ||
498 | spin_lock(&sl->lock); | |
9ce6cf25 | 499 | if (!netif_running(dev)) { |
1da177e4 LT |
500 | spin_unlock(&sl->lock); |
501 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
502 | dev_kfree_skb(skb); | |
6ed10654 | 503 | return NETDEV_TX_OK; |
1da177e4 LT |
504 | } |
505 | if (sl->tty == NULL) { | |
506 | spin_unlock(&sl->lock); | |
507 | dev_kfree_skb(skb); | |
6ed10654 | 508 | return NETDEV_TX_OK; |
1da177e4 LT |
509 | } |
510 | ||
511 | sl_lock(sl); | |
034de00b | 512 | dev->stats.tx_bytes += skb->len; |
1da177e4 LT |
513 | sl_encaps(sl, skb->data, skb->len); |
514 | spin_unlock(&sl->lock); | |
515 | ||
516 | dev_kfree_skb(skb); | |
6ed10654 | 517 | return NETDEV_TX_OK; |
1da177e4 LT |
518 | } |
519 | ||
520 | ||
521 | /****************************************** | |
522 | * Routines looking at netdevice side. | |
523 | ******************************************/ | |
524 | ||
525 | /* Netdevice UP -> DOWN routine */ | |
526 | ||
527 | static int | |
528 | sl_close(struct net_device *dev) | |
529 | { | |
530 | struct slip *sl = netdev_priv(dev); | |
531 | ||
532 | spin_lock_bh(&sl->lock); | |
8a1ec21e | 533 | if (sl->tty) |
1da177e4 | 534 | /* TTY discipline is running. */ |
8a1ec21e | 535 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
536 | netif_stop_queue(dev); |
537 | sl->rcount = 0; | |
538 | sl->xleft = 0; | |
539 | spin_unlock_bh(&sl->lock); | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | /* Netdevice DOWN -> UP routine */ | |
545 | ||
546 | static int sl_open(struct net_device *dev) | |
547 | { | |
548 | struct slip *sl = netdev_priv(dev); | |
549 | ||
9ce6cf25 | 550 | if (sl->tty == NULL) |
1da177e4 LT |
551 | return -ENODEV; |
552 | ||
553 | sl->flags &= (1 << SLF_INUSE); | |
554 | netif_start_queue(dev); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | /* Netdevice change MTU request */ | |
559 | ||
560 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
561 | { | |
562 | struct slip *sl = netdev_priv(dev); | |
563 | ||
b3e3893e | 564 | return sl_realloc_bufs(sl, new_mtu); |
1da177e4 LT |
565 | } |
566 | ||
567 | /* Netdevice get statistics request */ | |
568 | ||
bc1f4470 | 569 | static void |
034de00b | 570 | sl_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
1da177e4 | 571 | { |
034de00b | 572 | struct net_device_stats *devstats = &dev->stats; |
1da177e4 | 573 | #ifdef SL_INCLUDE_CSLIP |
034de00b | 574 | struct slip *sl = netdev_priv(dev); |
6f0bee16 | 575 | struct slcompress *comp = sl->slcomp; |
6f0bee16 | 576 | #endif |
034de00b TK |
577 | stats->rx_packets = devstats->rx_packets; |
578 | stats->tx_packets = devstats->tx_packets; | |
579 | stats->rx_bytes = devstats->rx_bytes; | |
580 | stats->tx_bytes = devstats->tx_bytes; | |
f3f70bf6 | 581 | stats->rx_dropped = devstats->rx_dropped; |
034de00b TK |
582 | stats->tx_dropped = devstats->tx_dropped; |
583 | stats->tx_errors = devstats->tx_errors; | |
584 | stats->rx_errors = devstats->rx_errors; | |
585 | stats->rx_over_errors = devstats->rx_over_errors; | |
6f0bee16 | 586 | |
f3f70bf6 MI |
587 | #ifdef SL_INCLUDE_CSLIP |
588 | if (comp) { | |
589 | /* Generic compressed statistics */ | |
590 | stats->rx_compressed = comp->sls_i_compressed; | |
591 | stats->tx_compressed = comp->sls_o_compressed; | |
592 | ||
593 | /* Are we really still needs this? */ | |
594 | stats->rx_fifo_errors += comp->sls_i_compressed; | |
595 | stats->rx_dropped += comp->sls_i_tossed; | |
596 | stats->tx_fifo_errors += comp->sls_o_compressed; | |
597 | stats->collisions += comp->sls_o_misses; | |
598 | } | |
599 | #endif | |
1da177e4 LT |
600 | } |
601 | ||
602 | /* Netdevice register callback */ | |
603 | ||
604 | static int sl_init(struct net_device *dev) | |
605 | { | |
606 | struct slip *sl = netdev_priv(dev); | |
607 | ||
608 | /* | |
6aa20a22 | 609 | * Finish setting up the DEVICE info. |
1da177e4 LT |
610 | */ |
611 | ||
612 | dev->mtu = sl->mtu; | |
613 | dev->type = ARPHRD_SLIP + sl->mode; | |
614 | #ifdef SL_CHECK_TRANSMIT | |
1da177e4 LT |
615 | dev->watchdog_timeo = 20*HZ; |
616 | #endif | |
617 | return 0; | |
618 | } | |
619 | ||
620 | ||
621 | static void sl_uninit(struct net_device *dev) | |
622 | { | |
623 | struct slip *sl = netdev_priv(dev); | |
624 | ||
625 | sl_free_bufs(sl); | |
626 | } | |
627 | ||
5342b77c AC |
628 | /* Hook the destructor so we can free slip devices at the right point in time */ |
629 | static void sl_free_netdev(struct net_device *dev) | |
630 | { | |
631 | int i = dev->base_addr; | |
cf124db5 | 632 | |
5342b77c AC |
633 | slip_devs[i] = NULL; |
634 | } | |
635 | ||
b1da683d SH |
636 | static const struct net_device_ops sl_netdev_ops = { |
637 | .ndo_init = sl_init, | |
638 | .ndo_uninit = sl_uninit, | |
639 | .ndo_open = sl_open, | |
640 | .ndo_stop = sl_close, | |
641 | .ndo_start_xmit = sl_xmit, | |
034de00b | 642 | .ndo_get_stats64 = sl_get_stats64, |
b1da683d SH |
643 | .ndo_change_mtu = sl_change_mtu, |
644 | .ndo_tx_timeout = sl_tx_timeout, | |
645 | #ifdef CONFIG_SLIP_SMART | |
646 | .ndo_do_ioctl = sl_ioctl, | |
647 | #endif | |
648 | }; | |
649 | ||
650 | ||
1da177e4 LT |
651 | static void sl_setup(struct net_device *dev) |
652 | { | |
b1da683d | 653 | dev->netdev_ops = &sl_netdev_ops; |
cf124db5 DM |
654 | dev->needs_free_netdev = true; |
655 | dev->priv_destructor = sl_free_netdev; | |
b1da683d | 656 | |
1da177e4 LT |
657 | dev->hard_header_len = 0; |
658 | dev->addr_len = 0; | |
659 | dev->tx_queue_len = 10; | |
660 | ||
b3e3893e JW |
661 | /* MTU range: 68 - 65534 */ |
662 | dev->min_mtu = 68; | |
663 | dev->max_mtu = 65534; | |
664 | ||
1da177e4 LT |
665 | /* New-style flags. */ |
666 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
667 | } | |
668 | ||
669 | /****************************************** | |
670 | Routines looking at TTY side. | |
671 | ******************************************/ | |
672 | ||
673 | ||
1da177e4 LT |
674 | /* |
675 | * Handle the 'receiver data ready' interrupt. | |
676 | * This function is called by the 'tty_io' module in the kernel when | |
677 | * a block of SLIP data has been received, which can now be decapsulated | |
678 | * and sent on to some IP layer for further processing. This will not | |
679 | * be re-entered while running but other ldisc functions may be called | |
680 | * in parallel | |
681 | */ | |
6aa20a22 | 682 | |
55db4c64 LT |
683 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
684 | char *fp, int count) | |
1da177e4 | 685 | { |
9ce6cf25 | 686 | struct slip *sl = tty->disc_data; |
1da177e4 | 687 | |
9ce6cf25 | 688 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
55db4c64 | 689 | return; |
1da177e4 LT |
690 | |
691 | /* Read the characters out of the buffer */ | |
55db4c64 | 692 | while (count--) { |
1da177e4 | 693 | if (fp && *fp++) { |
9ce6cf25 | 694 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
034de00b | 695 | sl->dev->stats.rx_errors++; |
1da177e4 LT |
696 | cp++; |
697 | continue; | |
698 | } | |
699 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
700 | if (sl->mode & SL_MODE_SLIP6) | |
701 | slip_unesc6(sl, *cp++); | |
702 | else | |
703 | #endif | |
704 | slip_unesc(sl, *cp++); | |
705 | } | |
706 | } | |
707 | ||
708 | /************************************ | |
709 | * slip_open helper routines. | |
710 | ************************************/ | |
711 | ||
712 | /* Collect hanged up channels */ | |
1da177e4 LT |
713 | static void sl_sync(void) |
714 | { | |
715 | int i; | |
716 | struct net_device *dev; | |
717 | struct slip *sl; | |
718 | ||
719 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
720 | dev = slip_devs[i]; |
721 | if (dev == NULL) | |
1da177e4 LT |
722 | break; |
723 | ||
724 | sl = netdev_priv(dev); | |
725 | if (sl->tty || sl->leased) | |
726 | continue; | |
9ce6cf25 | 727 | if (dev->flags & IFF_UP) |
1da177e4 LT |
728 | dev_close(dev); |
729 | } | |
730 | } | |
731 | ||
732 | ||
733 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
936e5d8b | 734 | static struct slip *sl_alloc(void) |
1da177e4 LT |
735 | { |
736 | int i; | |
390fd0b3 | 737 | char name[IFNAMSIZ]; |
1da177e4 LT |
738 | struct net_device *dev = NULL; |
739 | struct slip *sl; | |
740 | ||
1da177e4 LT |
741 | for (i = 0; i < slip_maxdev; i++) { |
742 | dev = slip_devs[i]; | |
743 | if (dev == NULL) | |
744 | break; | |
1da177e4 | 745 | } |
1da177e4 LT |
746 | /* Sorry, too many, all slots in use */ |
747 | if (i >= slip_maxdev) | |
748 | return NULL; | |
749 | ||
390fd0b3 | 750 | sprintf(name, "sl%d", i); |
c835a677 | 751 | dev = alloc_netdev(sizeof(*sl), name, NET_NAME_UNKNOWN, sl_setup); |
390fd0b3 MI |
752 | if (!dev) |
753 | return NULL; | |
1da177e4 | 754 | |
390fd0b3 | 755 | dev->base_addr = i; |
1da177e4 LT |
756 | sl = netdev_priv(dev); |
757 | ||
758 | /* Initialize channel control data */ | |
759 | sl->magic = SLIP_MAGIC; | |
760 | sl->dev = dev; | |
761 | spin_lock_init(&sl->lock); | |
661f7fda | 762 | INIT_WORK(&sl->tx_work, slip_transmit); |
1da177e4 LT |
763 | sl->mode = SL_MODE_DEFAULT; |
764 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 | 765 | /* initialize timer_list struct */ |
e99e88a9 KC |
766 | timer_setup(&sl->keepalive_timer, sl_keepalive, 0); |
767 | timer_setup(&sl->outfill_timer, sl_outfill, 0); | |
1da177e4 LT |
768 | #endif |
769 | slip_devs[i] = dev; | |
1da177e4 LT |
770 | return sl; |
771 | } | |
772 | ||
773 | /* | |
774 | * Open the high-level part of the SLIP channel. | |
775 | * This function is called by the TTY module when the | |
776 | * SLIP line discipline is called for. Because we are | |
777 | * sure the tty line exists, we only have to link it to | |
778 | * a free SLIP channel... | |
779 | * | |
780 | * Called in process context serialized from other ldisc calls. | |
781 | */ | |
782 | ||
783 | static int slip_open(struct tty_struct *tty) | |
784 | { | |
785 | struct slip *sl; | |
786 | int err; | |
787 | ||
9ce6cf25 | 788 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 789 | return -EPERM; |
6aa20a22 | 790 | |
f34d7a5b AC |
791 | if (tty->ops->write == NULL) |
792 | return -EOPNOTSUPP; | |
793 | ||
1da177e4 LT |
794 | /* RTnetlink lock is misused here to serialize concurrent |
795 | opens of slip channels. There are better ways, but it is | |
796 | the simplest one. | |
797 | */ | |
798 | rtnl_lock(); | |
799 | ||
800 | /* Collect hanged up channels. */ | |
801 | sl_sync(); | |
802 | ||
9ce6cf25 | 803 | sl = tty->disc_data; |
1da177e4 LT |
804 | |
805 | err = -EEXIST; | |
806 | /* First make sure we're not already connected. */ | |
807 | if (sl && sl->magic == SLIP_MAGIC) | |
808 | goto err_exit; | |
809 | ||
810 | /* OK. Find a free SLIP channel to use. */ | |
811 | err = -ENFILE; | |
936e5d8b | 812 | sl = sl_alloc(); |
9ce6cf25 | 813 | if (sl == NULL) |
1da177e4 LT |
814 | goto err_exit; |
815 | ||
816 | sl->tty = tty; | |
817 | tty->disc_data = sl; | |
1da177e4 | 818 | sl->pid = current->pid; |
6aa20a22 | 819 | |
1da177e4 LT |
820 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
821 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
822 | err = sl_alloc_bufs(sl, SL_MTU); |
823 | if (err) | |
1da177e4 LT |
824 | goto err_free_chan; |
825 | ||
826 | set_bit(SLF_INUSE, &sl->flags); | |
827 | ||
9ce6cf25 AC |
828 | err = register_netdevice(sl->dev); |
829 | if (err) | |
1da177e4 LT |
830 | goto err_free_bufs; |
831 | } | |
832 | ||
833 | #ifdef CONFIG_SLIP_SMART | |
834 | if (sl->keepalive) { | |
9ce6cf25 AC |
835 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
836 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
837 | } |
838 | if (sl->outfill) { | |
9ce6cf25 AC |
839 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
840 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
841 | } |
842 | #endif | |
843 | ||
844 | /* Done. We have linked the TTY line to a channel. */ | |
845 | rtnl_unlock(); | |
33f0f88f | 846 | tty->receive_room = 65536; /* We don't flow control */ |
057bef93 MI |
847 | |
848 | /* TTY layer expects 0 on success */ | |
849 | return 0; | |
1da177e4 LT |
850 | |
851 | err_free_bufs: | |
852 | sl_free_bufs(sl); | |
853 | ||
854 | err_free_chan: | |
855 | sl->tty = NULL; | |
856 | tty->disc_data = NULL; | |
857 | clear_bit(SLF_INUSE, &sl->flags); | |
858 | ||
859 | err_exit: | |
860 | rtnl_unlock(); | |
861 | ||
862 | /* Count references from TTY module */ | |
863 | return err; | |
864 | } | |
865 | ||
1da177e4 LT |
866 | /* |
867 | * Close down a SLIP channel. | |
868 | * This means flushing out any pending queues, and then returning. This | |
869 | * call is serialized against other ldisc functions. | |
5342b77c AC |
870 | * |
871 | * We also use this method fo a hangup event | |
1da177e4 | 872 | */ |
5342b77c | 873 | |
9ce6cf25 | 874 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 875 | { |
9ce6cf25 | 876 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
877 | |
878 | /* First make sure we're connected. */ | |
879 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
880 | return; | |
881 | ||
661f7fda | 882 | spin_lock_bh(&sl->lock); |
1da177e4 LT |
883 | tty->disc_data = NULL; |
884 | sl->tty = NULL; | |
661f7fda TH |
885 | spin_unlock_bh(&sl->lock); |
886 | ||
887 | flush_work(&sl->tx_work); | |
1da177e4 LT |
888 | |
889 | /* VSV = very important to remove timers */ | |
890 | #ifdef CONFIG_SLIP_SMART | |
891 | del_timer_sync(&sl->keepalive_timer); | |
892 | del_timer_sync(&sl->outfill_timer); | |
893 | #endif | |
5342b77c AC |
894 | /* Flush network side */ |
895 | unregister_netdev(sl->dev); | |
896 | /* This will complete via sl_free_netdev */ | |
1da177e4 LT |
897 | } |
898 | ||
5342b77c AC |
899 | static int slip_hangup(struct tty_struct *tty) |
900 | { | |
901 | slip_close(tty); | |
902 | return 0; | |
903 | } | |
1da177e4 LT |
904 | /************************************************************************ |
905 | * STANDARD SLIP ENCAPSULATION * | |
906 | ************************************************************************/ | |
907 | ||
9ce6cf25 | 908 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
909 | { |
910 | unsigned char *ptr = d; | |
911 | unsigned char c; | |
912 | ||
913 | /* | |
914 | * Send an initial END character to flush out any | |
915 | * data that may have accumulated in the receiver | |
916 | * due to line noise. | |
917 | */ | |
918 | ||
919 | *ptr++ = END; | |
920 | ||
921 | /* | |
922 | * For each byte in the packet, send the appropriate | |
923 | * character sequence, according to the SLIP protocol. | |
924 | */ | |
925 | ||
926 | while (len-- > 0) { | |
9ce6cf25 AC |
927 | switch (c = *s++) { |
928 | case END: | |
1da177e4 LT |
929 | *ptr++ = ESC; |
930 | *ptr++ = ESC_END; | |
931 | break; | |
9ce6cf25 | 932 | case ESC: |
1da177e4 LT |
933 | *ptr++ = ESC; |
934 | *ptr++ = ESC_ESC; | |
935 | break; | |
9ce6cf25 | 936 | default: |
1da177e4 LT |
937 | *ptr++ = c; |
938 | break; | |
939 | } | |
940 | } | |
941 | *ptr++ = END; | |
807540ba | 942 | return ptr - d; |
1da177e4 LT |
943 | } |
944 | ||
945 | static void slip_unesc(struct slip *sl, unsigned char s) | |
946 | { | |
947 | ||
9ce6cf25 AC |
948 | switch (s) { |
949 | case END: | |
1da177e4 LT |
950 | #ifdef CONFIG_SLIP_SMART |
951 | /* drop keeptest bit = VSV */ | |
952 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
953 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
954 | #endif | |
955 | ||
8e95a202 JP |
956 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
957 | (sl->rcount > 2)) | |
1da177e4 | 958 | sl_bump(sl); |
1da177e4 LT |
959 | clear_bit(SLF_ESCAPE, &sl->flags); |
960 | sl->rcount = 0; | |
961 | return; | |
962 | ||
9ce6cf25 | 963 | case ESC: |
1da177e4 LT |
964 | set_bit(SLF_ESCAPE, &sl->flags); |
965 | return; | |
9ce6cf25 AC |
966 | case ESC_ESC: |
967 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 968 | s = ESC; |
1da177e4 | 969 | break; |
9ce6cf25 AC |
970 | case ESC_END: |
971 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 972 | s = END; |
1da177e4 LT |
973 | break; |
974 | } | |
975 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
976 | if (sl->rcount < sl->buffsize) { | |
977 | sl->rbuff[sl->rcount++] = s; | |
978 | return; | |
979 | } | |
034de00b | 980 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
981 | set_bit(SLF_ERROR, &sl->flags); |
982 | } | |
983 | } | |
984 | ||
985 | ||
986 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
987 | /************************************************************************ | |
988 | * 6 BIT SLIP ENCAPSULATION * | |
989 | ************************************************************************/ | |
990 | ||
9ce6cf25 | 991 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
992 | { |
993 | unsigned char *ptr = d; | |
994 | unsigned char c; | |
995 | int i; | |
996 | unsigned short v = 0; | |
997 | short bits = 0; | |
998 | ||
999 | /* | |
1000 | * Send an initial END character to flush out any | |
1001 | * data that may have accumulated in the receiver | |
1002 | * due to line noise. | |
1003 | */ | |
1004 | ||
1005 | *ptr++ = 0x70; | |
1006 | ||
1007 | /* | |
1008 | * Encode the packet into printable ascii characters | |
1009 | */ | |
1010 | ||
1011 | for (i = 0; i < len; ++i) { | |
1012 | v = (v << 8) | s[i]; | |
1013 | bits += 8; | |
1014 | while (bits >= 6) { | |
1015 | bits -= 6; | |
1016 | c = 0x30 + ((v >> bits) & 0x3F); | |
1017 | *ptr++ = c; | |
1018 | } | |
1019 | } | |
1020 | if (bits) { | |
1021 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1022 | *ptr++ = c; | |
1023 | } | |
1024 | *ptr++ = 0x70; | |
1025 | return ptr - d; | |
1026 | } | |
1027 | ||
9ce6cf25 | 1028 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1029 | { |
1030 | unsigned char c; | |
1031 | ||
1032 | if (s == 0x70) { | |
1033 | #ifdef CONFIG_SLIP_SMART | |
1034 | /* drop keeptest bit = VSV */ | |
1035 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1036 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1037 | #endif | |
1038 | ||
8e95a202 JP |
1039 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
1040 | (sl->rcount > 2)) | |
1da177e4 | 1041 | sl_bump(sl); |
1da177e4 LT |
1042 | sl->rcount = 0; |
1043 | sl->xbits = 0; | |
1044 | sl->xdata = 0; | |
9ce6cf25 | 1045 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1046 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1047 | sl->xbits += 6; | |
1048 | if (sl->xbits >= 8) { | |
1049 | sl->xbits -= 8; | |
1050 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1051 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1052 | if (sl->rcount < sl->buffsize) { | |
1053 | sl->rbuff[sl->rcount++] = c; | |
1054 | return; | |
1055 | } | |
034de00b | 1056 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
1057 | set_bit(SLF_ERROR, &sl->flags); |
1058 | } | |
1059 | } | |
9ce6cf25 | 1060 | } |
1da177e4 LT |
1061 | } |
1062 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1063 | ||
1064 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1065 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1066 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1067 | { |
9ce6cf25 | 1068 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1069 | unsigned int tmp; |
1070 | int __user *p = (int __user *)arg; | |
1071 | ||
1072 | /* First make sure we're connected. */ | |
9ce6cf25 | 1073 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1074 | return -EINVAL; |
1da177e4 | 1075 | |
9ce6cf25 AC |
1076 | switch (cmd) { |
1077 | case SIOCGIFNAME: | |
1da177e4 LT |
1078 | tmp = strlen(sl->dev->name) + 1; |
1079 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1080 | return -EFAULT; | |
1081 | return 0; | |
1082 | ||
1083 | case SIOCGIFENCAP: | |
1084 | if (put_user(sl->mode, p)) | |
1085 | return -EFAULT; | |
1086 | return 0; | |
1087 | ||
1088 | case SIOCSIFENCAP: | |
1089 | if (get_user(tmp, p)) | |
1090 | return -EFAULT; | |
1091 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1092 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1093 | return -EINVAL; |
1da177e4 LT |
1094 | #else |
1095 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1096 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1097 | /* return -EINVAL; */ |
1098 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1099 | #endif |
1100 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1101 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1102 | return -EINVAL; |
1da177e4 LT |
1103 | #endif |
1104 | sl->mode = tmp; | |
9ce6cf25 | 1105 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1106 | return 0; |
1107 | ||
9ce6cf25 | 1108 | case SIOCSIFHWADDR: |
1da177e4 LT |
1109 | return -EINVAL; |
1110 | ||
1111 | #ifdef CONFIG_SLIP_SMART | |
1112 | /* VSV changes start here */ | |
9ce6cf25 | 1113 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1114 | if (get_user(tmp, p)) |
1115 | return -EFAULT; | |
9ce6cf25 | 1116 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1117 | return -EINVAL; |
1118 | ||
1119 | spin_lock_bh(&sl->lock); | |
1120 | if (!sl->tty) { | |
1121 | spin_unlock_bh(&sl->lock); | |
1122 | return -ENODEV; | |
1123 | } | |
9ce6cf25 AC |
1124 | sl->keepalive = (u8)tmp; |
1125 | if (sl->keepalive != 0) { | |
1126 | mod_timer(&sl->keepalive_timer, | |
1127 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1128 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1129 | } else |
1130 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1131 | spin_unlock_bh(&sl->lock); |
1132 | return 0; | |
1133 | ||
9ce6cf25 | 1134 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1135 | if (put_user(sl->keepalive, p)) |
1136 | return -EFAULT; | |
1137 | return 0; | |
1138 | ||
9ce6cf25 | 1139 | case SIOCSOUTFILL: |
1da177e4 LT |
1140 | if (get_user(tmp, p)) |
1141 | return -EFAULT; | |
9ce6cf25 | 1142 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1143 | return -EINVAL; |
1144 | spin_lock_bh(&sl->lock); | |
1145 | if (!sl->tty) { | |
1146 | spin_unlock_bh(&sl->lock); | |
1147 | return -ENODEV; | |
1148 | } | |
9ce6cf25 AC |
1149 | sl->outfill = (u8)tmp; |
1150 | if (sl->outfill != 0) { | |
1151 | mod_timer(&sl->outfill_timer, | |
1152 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1153 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1154 | } else |
1155 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1156 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1157 | return 0; |
1da177e4 | 1158 | |
9ce6cf25 | 1159 | case SIOCGOUTFILL: |
1da177e4 LT |
1160 | if (put_user(sl->outfill, p)) |
1161 | return -EFAULT; | |
1162 | return 0; | |
1163 | /* VSV changes end */ | |
1164 | #endif | |
1da177e4 | 1165 | default: |
d0127539 | 1166 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1167 | } |
1168 | } | |
1169 | ||
1170 | /* VSV changes start here */ | |
1171 | #ifdef CONFIG_SLIP_SMART | |
1172 | /* function do_ioctl called from net/core/dev.c | |
1173 | to allow get/set outfill/keepalive parameter | |
1174 | by ifconfig */ | |
1175 | ||
9ce6cf25 | 1176 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1177 | { |
1178 | struct slip *sl = netdev_priv(dev); | |
1179 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1180 | ||
1181 | if (sl == NULL) /* Allocation failed ?? */ | |
1182 | return -ENODEV; | |
1183 | ||
1184 | spin_lock_bh(&sl->lock); | |
1185 | ||
1186 | if (!sl->tty) { | |
1187 | spin_unlock_bh(&sl->lock); | |
1188 | return -ENODEV; | |
1189 | } | |
1190 | ||
9ce6cf25 AC |
1191 | switch (cmd) { |
1192 | case SIOCSKEEPALIVE: | |
1da177e4 | 1193 | /* max for unchar */ |
9ce6cf25 | 1194 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1195 | spin_unlock_bh(&sl->lock); |
1196 | return -EINVAL; | |
1197 | } | |
9ce6cf25 | 1198 | sl->keepalive = (u8)*p; |
1da177e4 | 1199 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1200 | sl->keepalive_timer.expires = |
1201 | jiffies + sl->keepalive * HZ; | |
1202 | mod_timer(&sl->keepalive_timer, | |
1203 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1204 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1205 | } else |
1206 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1207 | break; |
1208 | ||
9ce6cf25 | 1209 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1210 | *p = sl->keepalive; |
1211 | break; | |
1212 | ||
9ce6cf25 AC |
1213 | case SIOCSOUTFILL: |
1214 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1215 | spin_unlock_bh(&sl->lock); |
1216 | return -EINVAL; | |
1217 | } | |
9ce6cf25 AC |
1218 | sl->outfill = (u8)*p; |
1219 | if (sl->outfill != 0) { | |
1220 | mod_timer(&sl->outfill_timer, | |
1221 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1222 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1223 | } else |
1224 | del_timer(&sl->outfill_timer); | |
1225 | break; | |
1da177e4 | 1226 | |
9ce6cf25 | 1227 | case SIOCGOUTFILL: |
1da177e4 LT |
1228 | *p = sl->outfill; |
1229 | break; | |
1230 | ||
9ce6cf25 | 1231 | case SIOCSLEASE: |
6aa20a22 | 1232 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1233 | and opened by another process device. |
1234 | */ | |
9ce6cf25 AC |
1235 | if (sl->tty != current->signal->tty && |
1236 | sl->pid != current->pid) { | |
1da177e4 LT |
1237 | spin_unlock_bh(&sl->lock); |
1238 | return -EPERM; | |
1239 | } | |
1240 | sl->leased = 0; | |
9ce6cf25 | 1241 | if (*p) |
1da177e4 | 1242 | sl->leased = 1; |
9ce6cf25 | 1243 | break; |
1da177e4 | 1244 | |
9ce6cf25 | 1245 | case SIOCGLEASE: |
1da177e4 | 1246 | *p = sl->leased; |
ee289b64 | 1247 | } |
1da177e4 LT |
1248 | spin_unlock_bh(&sl->lock); |
1249 | return 0; | |
1250 | } | |
1251 | #endif | |
1252 | /* VSV changes end */ | |
1253 | ||
a352def2 | 1254 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 LT |
1255 | .owner = THIS_MODULE, |
1256 | .magic = TTY_LDISC_MAGIC, | |
1257 | .name = "slip", | |
1258 | .open = slip_open, | |
1259 | .close = slip_close, | |
5342b77c | 1260 | .hangup = slip_hangup, |
1da177e4 LT |
1261 | .ioctl = slip_ioctl, |
1262 | .receive_buf = slip_receive_buf, | |
1da177e4 LT |
1263 | .write_wakeup = slip_write_wakeup, |
1264 | }; | |
1265 | ||
1266 | static int __init slip_init(void) | |
1267 | { | |
1268 | int status; | |
1269 | ||
1270 | if (slip_maxdev < 4) | |
1271 | slip_maxdev = 4; /* Sanity */ | |
1272 | ||
1273 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1274 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1275 | " (6 bit encapsulation enabled)" | |
1276 | #endif | |
1277 | ".\n", | |
9ce6cf25 | 1278 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1279 | #if defined(SL_INCLUDE_CSLIP) |
1280 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1281 | #endif | |
1282 | #ifdef CONFIG_SLIP_SMART | |
1283 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1284 | #endif | |
1285 | ||
6396bb22 | 1286 | slip_devs = kcalloc(slip_maxdev, sizeof(struct net_device *), |
9ce6cf25 | 1287 | GFP_KERNEL); |
e404decb | 1288 | if (!slip_devs) |
1da177e4 | 1289 | return -ENOMEM; |
1da177e4 | 1290 | |
1da177e4 | 1291 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1292 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1293 | if (status != 0) { | |
1da177e4 LT |
1294 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1295 | kfree(slip_devs); | |
1296 | } | |
1297 | return status; | |
1298 | } | |
1299 | ||
1300 | static void __exit slip_exit(void) | |
1301 | { | |
1302 | int i; | |
1303 | struct net_device *dev; | |
1304 | struct slip *sl; | |
1305 | unsigned long timeout = jiffies + HZ; | |
1306 | int busy = 0; | |
1307 | ||
6aa20a22 | 1308 | if (slip_devs == NULL) |
1da177e4 LT |
1309 | return; |
1310 | ||
1311 | /* First of all: check for active disciplines and hangup them. | |
1312 | */ | |
1313 | do { | |
a9fc2510 NA |
1314 | if (busy) |
1315 | msleep_interruptible(100); | |
1da177e4 LT |
1316 | |
1317 | busy = 0; | |
1318 | for (i = 0; i < slip_maxdev; i++) { | |
1319 | dev = slip_devs[i]; | |
1320 | if (!dev) | |
1321 | continue; | |
1322 | sl = netdev_priv(dev); | |
1323 | spin_lock_bh(&sl->lock); | |
1324 | if (sl->tty) { | |
1325 | busy++; | |
1326 | tty_hangup(sl->tty); | |
1327 | } | |
1328 | spin_unlock_bh(&sl->lock); | |
1329 | } | |
1330 | } while (busy && time_before(jiffies, timeout)); | |
1331 | ||
5342b77c AC |
1332 | /* FIXME: hangup is async so we should wait when doing this second |
1333 | phase */ | |
1da177e4 LT |
1334 | |
1335 | for (i = 0; i < slip_maxdev; i++) { | |
1336 | dev = slip_devs[i]; | |
1337 | if (!dev) | |
1338 | continue; | |
1339 | slip_devs[i] = NULL; | |
1340 | ||
1341 | sl = netdev_priv(dev); | |
1342 | if (sl->tty) { | |
1343 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1344 | dev->name); | |
6aa20a22 | 1345 | } |
1da177e4 LT |
1346 | |
1347 | unregister_netdev(dev); | |
1348 | } | |
1349 | ||
1350 | kfree(slip_devs); | |
1351 | slip_devs = NULL; | |
1352 | ||
9ce6cf25 AC |
1353 | i = tty_unregister_ldisc(N_SLIP); |
1354 | if (i != 0) | |
1da177e4 | 1355 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1356 | } |
1357 | ||
1358 | module_init(slip_init); | |
1359 | module_exit(slip_exit); | |
1360 | ||
1361 | #ifdef CONFIG_SLIP_SMART | |
1362 | /* | |
1363 | * This is start of the code for multislip style line checking | |
1364 | * added by Stanislav Voronyi. All changes before marked VSV | |
1365 | */ | |
1366 | ||
e99e88a9 | 1367 | static void sl_outfill(struct timer_list *t) |
1da177e4 | 1368 | { |
e99e88a9 | 1369 | struct slip *sl = from_timer(sl, t, outfill_timer); |
1da177e4 LT |
1370 | |
1371 | spin_lock(&sl->lock); | |
1372 | ||
1373 | if (sl->tty == NULL) | |
1374 | goto out; | |
1375 | ||
9ce6cf25 AC |
1376 | if (sl->outfill) { |
1377 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1378 | /* no packets were transmitted, do outfill */ |
1379 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1380 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1381 | #else | |
1382 | unsigned char s = END; | |
1383 | #endif | |
1384 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1385 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1386 | /* if device busy no outfill */ |
f34d7a5b | 1387 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1388 | } |
9ce6cf25 | 1389 | } else |
1da177e4 LT |
1390 | set_bit(SLF_OUTWAIT, &sl->flags); |
1391 | ||
1392 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1393 | } | |
1394 | out: | |
1395 | spin_unlock(&sl->lock); | |
1396 | } | |
1397 | ||
e99e88a9 | 1398 | static void sl_keepalive(struct timer_list *t) |
1da177e4 | 1399 | { |
e99e88a9 | 1400 | struct slip *sl = from_timer(sl, t, keepalive_timer); |
1da177e4 LT |
1401 | |
1402 | spin_lock(&sl->lock); | |
1403 | ||
1404 | if (sl->tty == NULL) | |
1405 | goto out; | |
1406 | ||
9ce6cf25 AC |
1407 | if (sl->keepalive) { |
1408 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1409 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1410 | if (sl->outfill) |
1411 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1412 | (void)del_timer(&sl->outfill_timer); |
1413 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1414 | /* this must hangup tty & close slip */ |
1415 | tty_hangup(sl->tty); | |
1da177e4 LT |
1416 | /* I think we need not something else */ |
1417 | goto out; | |
9ce6cf25 | 1418 | } else |
1da177e4 LT |
1419 | set_bit(SLF_KEEPTEST, &sl->flags); |
1420 | ||
1421 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1422 | } | |
1da177e4 LT |
1423 | out: |
1424 | spin_unlock(&sl->lock); | |
1425 | } | |
1426 | ||
1427 | #endif | |
1428 | MODULE_LICENSE("GPL"); | |
1429 | MODULE_ALIAS_LDISC(N_SLIP); |