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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * slip.c This module implements the SLIP protocol for kernel-based | |
3 | * devices like TTY. It interfaces between a raw TTY, and the | |
4 | * kernel's INET protocol layers. | |
5 | * | |
6 | * Version: @(#)slip.c 0.8.3 12/24/94 | |
7 | * | |
8 | * Authors: Laurence Culhane, <loz@holmes.demon.co.uk> | |
9 | * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> | |
10 | * | |
11 | * Fixes: | |
12 | * Alan Cox : Sanity checks and avoid tx overruns. | |
13 | * Has a new sl->mtu field. | |
9ce6cf25 AC |
14 | * Alan Cox : Found cause of overrun. ifconfig sl0 |
15 | * mtu upwards. Driver now spots this | |
16 | * and grows/shrinks its buffers(hack!). | |
17 | * Memory leak if you run out of memory | |
18 | * setting up a slip driver fixed. | |
1da177e4 LT |
19 | * Matt Dillon : Printable slip (borrowed from NET2E) |
20 | * Pauline Middelink : Slip driver fixes. | |
21 | * Alan Cox : Honours the old SL_COMPRESSED flag | |
22 | * Alan Cox : KISS AX.25 and AXUI IP support | |
23 | * Michael Riepe : Automatic CSLIP recognition added | |
24 | * Charles Hedrick : CSLIP header length problem fix. | |
25 | * Alan Cox : Corrected non-IP cases of the above. | |
26 | * Alan Cox : Now uses hardware type as per FvK. | |
27 | * Alan Cox : Default to 192.168.0.0 (RFC 1597) | |
28 | * A.N.Kuznetsov : dev_tint() recursion fix. | |
29 | * Dmitry Gorodchanin : SLIP memory leaks | |
30 | * Dmitry Gorodchanin : Code cleanup. Reduce tty driver | |
31 | * buffering from 4096 to 256 bytes. | |
32 | * Improving SLIP response time. | |
33 | * CONFIG_SLIP_MODE_SLIP6. | |
9ce6cf25 AC |
34 | * ifconfig sl? up & down now works |
35 | * correctly. | |
1da177e4 LT |
36 | * Modularization. |
37 | * Alan Cox : Oops - fix AX.25 buffer lengths | |
38 | * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP | |
39 | * statistics. Include CSLIP code only | |
40 | * if it really needed. | |
41 | * Alan Cox : Free slhc buffers in the right place. | |
42 | * Alan Cox : Allow for digipeated IP over AX.25 | |
43 | * Matti Aarnio : Dynamic SLIP devices, with ideas taken | |
44 | * from Jim Freeman's <jfree@caldera.com> | |
45 | * dynamic PPP devices. We do NOT kfree() | |
46 | * device entries, just reg./unreg. them | |
47 | * as they are needed. We kfree() them | |
48 | * at module cleanup. | |
9ce6cf25 AC |
49 | * With MODULE-loading ``insmod'', user |
50 | * can issue parameter: slip_maxdev=1024 | |
51 | * (Or how much he/she wants.. Default | |
52 | * is 256) | |
53 | * Stanislav Voronyi : Slip line checking, with ideas taken | |
54 | * from multislip BSDI driver which was | |
55 | * written by Igor Chechik, RELCOM Corp. | |
56 | * Only algorithms have been ported to | |
57 | * Linux SLIP driver. | |
1da177e4 | 58 | * Vitaly E. Lavrov : Sane behaviour on tty hangup. |
9ce6cf25 AC |
59 | * Alexey Kuznetsov : Cleanup interfaces to tty & netdevice |
60 | * modules. | |
1da177e4 LT |
61 | */ |
62 | ||
63 | #define SL_CHECK_TRANSMIT | |
1da177e4 LT |
64 | #include <linux/module.h> |
65 | #include <linux/moduleparam.h> | |
66 | ||
7c0f6ba6 | 67 | #include <linux/uaccess.h> |
1da177e4 | 68 | #include <linux/bitops.h> |
3f07c014 | 69 | #include <linux/sched/signal.h> |
1da177e4 LT |
70 | #include <linux/string.h> |
71 | #include <linux/mm.h> | |
72 | #include <linux/interrupt.h> | |
73 | #include <linux/in.h> | |
74 | #include <linux/tty.h> | |
75 | #include <linux/errno.h> | |
76 | #include <linux/netdevice.h> | |
77 | #include <linux/etherdevice.h> | |
78 | #include <linux/skbuff.h> | |
79 | #include <linux/rtnetlink.h> | |
80 | #include <linux/if_arp.h> | |
81 | #include <linux/if_slip.h> | |
9646e7ce | 82 | #include <linux/compat.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 | |
109 | static void sl_keepalive(unsigned long sls); | |
110 | static void sl_outfill(unsigned long sls); | |
9ce6cf25 | 111 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); |
1da177e4 LT |
112 | #endif |
113 | ||
114 | /******************************** | |
115 | * Buffer administration routines: | |
116 | * sl_alloc_bufs() | |
117 | * sl_free_bufs() | |
118 | * sl_realloc_bufs() | |
119 | * | |
120 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
121 | * sl_realloc_bufs provides strong atomicity and reallocation | |
122 | * on actively running device. | |
123 | *********************************/ | |
124 | ||
6aa20a22 | 125 | /* |
1da177e4 LT |
126 | Allocate channel buffers. |
127 | */ | |
128 | ||
9ce6cf25 | 129 | static int sl_alloc_bufs(struct slip *sl, int mtu) |
1da177e4 LT |
130 | { |
131 | int err = -ENOBUFS; | |
132 | unsigned long len; | |
9ce6cf25 AC |
133 | char *rbuff = NULL; |
134 | char *xbuff = NULL; | |
1da177e4 | 135 | #ifdef SL_INCLUDE_CSLIP |
9ce6cf25 | 136 | char *cbuff = NULL; |
1da177e4 LT |
137 | struct slcompress *slcomp = NULL; |
138 | #endif | |
139 | ||
140 | /* | |
141 | * Allocate the SLIP frame buffers: | |
142 | * | |
143 | * rbuff Receive buffer. | |
144 | * xbuff Transmit buffer. | |
145 | * cbuff Temporary compression buffer. | |
146 | */ | |
147 | len = mtu * 2; | |
148 | ||
149 | /* | |
150 | * allow for arrival of larger UDP packets, even if we say not to | |
151 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
152 | * an MSS of 128 | |
153 | */ | |
154 | if (len < 576 * 2) | |
155 | len = 576 * 2; | |
156 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
157 | if (rbuff == NULL) | |
158 | goto err_exit; | |
159 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
160 | if (xbuff == NULL) | |
161 | goto err_exit; | |
162 | #ifdef SL_INCLUDE_CSLIP | |
163 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
164 | if (cbuff == NULL) | |
165 | goto err_exit; | |
166 | slcomp = slhc_init(16, 16); | |
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; |
9ce6cf25 | 367 | memcpy(skb_put(skb, count), sl->rbuff, count); |
98e399f8 | 368 | skb_reset_mac_header(skb); |
9ce6cf25 | 369 | skb->protocol = htons(ETH_P_IP); |
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; | |
632 | free_netdev(dev); | |
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; |
5342b77c | 654 | dev->destructor = sl_free_netdev; |
b1da683d | 655 | |
1da177e4 LT |
656 | dev->hard_header_len = 0; |
657 | dev->addr_len = 0; | |
658 | dev->tx_queue_len = 10; | |
659 | ||
b3e3893e JW |
660 | /* MTU range: 68 - 65534 */ |
661 | dev->min_mtu = 68; | |
662 | dev->max_mtu = 65534; | |
663 | ||
1da177e4 LT |
664 | /* New-style flags. */ |
665 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
666 | } | |
667 | ||
668 | /****************************************** | |
669 | Routines looking at TTY side. | |
670 | ******************************************/ | |
671 | ||
672 | ||
1da177e4 LT |
673 | /* |
674 | * Handle the 'receiver data ready' interrupt. | |
675 | * This function is called by the 'tty_io' module in the kernel when | |
676 | * a block of SLIP data has been received, which can now be decapsulated | |
677 | * and sent on to some IP layer for further processing. This will not | |
678 | * be re-entered while running but other ldisc functions may be called | |
679 | * in parallel | |
680 | */ | |
6aa20a22 | 681 | |
55db4c64 LT |
682 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
683 | char *fp, int count) | |
1da177e4 | 684 | { |
9ce6cf25 | 685 | struct slip *sl = tty->disc_data; |
1da177e4 | 686 | |
9ce6cf25 | 687 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
55db4c64 | 688 | return; |
1da177e4 LT |
689 | |
690 | /* Read the characters out of the buffer */ | |
55db4c64 | 691 | while (count--) { |
1da177e4 | 692 | if (fp && *fp++) { |
9ce6cf25 | 693 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
034de00b | 694 | sl->dev->stats.rx_errors++; |
1da177e4 LT |
695 | cp++; |
696 | continue; | |
697 | } | |
698 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
699 | if (sl->mode & SL_MODE_SLIP6) | |
700 | slip_unesc6(sl, *cp++); | |
701 | else | |
702 | #endif | |
703 | slip_unesc(sl, *cp++); | |
704 | } | |
705 | } | |
706 | ||
707 | /************************************ | |
708 | * slip_open helper routines. | |
709 | ************************************/ | |
710 | ||
711 | /* Collect hanged up channels */ | |
1da177e4 LT |
712 | static void sl_sync(void) |
713 | { | |
714 | int i; | |
715 | struct net_device *dev; | |
716 | struct slip *sl; | |
717 | ||
718 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
719 | dev = slip_devs[i]; |
720 | if (dev == NULL) | |
1da177e4 LT |
721 | break; |
722 | ||
723 | sl = netdev_priv(dev); | |
724 | if (sl->tty || sl->leased) | |
725 | continue; | |
9ce6cf25 | 726 | if (dev->flags & IFF_UP) |
1da177e4 LT |
727 | dev_close(dev); |
728 | } | |
729 | } | |
730 | ||
731 | ||
732 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
9ce6cf25 | 733 | static struct slip *sl_alloc(dev_t line) |
1da177e4 LT |
734 | { |
735 | int i; | |
390fd0b3 | 736 | char name[IFNAMSIZ]; |
1da177e4 LT |
737 | struct net_device *dev = NULL; |
738 | struct slip *sl; | |
739 | ||
1da177e4 LT |
740 | for (i = 0; i < slip_maxdev; i++) { |
741 | dev = slip_devs[i]; | |
742 | if (dev == NULL) | |
743 | break; | |
1da177e4 | 744 | } |
1da177e4 LT |
745 | /* Sorry, too many, all slots in use */ |
746 | if (i >= slip_maxdev) | |
747 | return NULL; | |
748 | ||
390fd0b3 | 749 | sprintf(name, "sl%d", i); |
c835a677 | 750 | dev = alloc_netdev(sizeof(*sl), name, NET_NAME_UNKNOWN, sl_setup); |
390fd0b3 MI |
751 | if (!dev) |
752 | return NULL; | |
1da177e4 | 753 | |
390fd0b3 | 754 | dev->base_addr = i; |
1da177e4 LT |
755 | sl = netdev_priv(dev); |
756 | ||
757 | /* Initialize channel control data */ | |
758 | sl->magic = SLIP_MAGIC; | |
759 | sl->dev = dev; | |
760 | spin_lock_init(&sl->lock); | |
661f7fda | 761 | INIT_WORK(&sl->tx_work, slip_transmit); |
1da177e4 LT |
762 | sl->mode = SL_MODE_DEFAULT; |
763 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
764 | /* initialize timer_list struct */ |
765 | init_timer(&sl->keepalive_timer); | |
766 | sl->keepalive_timer.data = (unsigned long)sl; | |
767 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 768 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
769 | sl->outfill_timer.data = (unsigned long)sl; |
770 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
771 | #endif |
772 | slip_devs[i] = dev; | |
1da177e4 LT |
773 | return sl; |
774 | } | |
775 | ||
776 | /* | |
777 | * Open the high-level part of the SLIP channel. | |
778 | * This function is called by the TTY module when the | |
779 | * SLIP line discipline is called for. Because we are | |
780 | * sure the tty line exists, we only have to link it to | |
781 | * a free SLIP channel... | |
782 | * | |
783 | * Called in process context serialized from other ldisc calls. | |
784 | */ | |
785 | ||
786 | static int slip_open(struct tty_struct *tty) | |
787 | { | |
788 | struct slip *sl; | |
789 | int err; | |
790 | ||
9ce6cf25 | 791 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 792 | return -EPERM; |
6aa20a22 | 793 | |
f34d7a5b AC |
794 | if (tty->ops->write == NULL) |
795 | return -EOPNOTSUPP; | |
796 | ||
1da177e4 LT |
797 | /* RTnetlink lock is misused here to serialize concurrent |
798 | opens of slip channels. There are better ways, but it is | |
799 | the simplest one. | |
800 | */ | |
801 | rtnl_lock(); | |
802 | ||
803 | /* Collect hanged up channels. */ | |
804 | sl_sync(); | |
805 | ||
9ce6cf25 | 806 | sl = tty->disc_data; |
1da177e4 LT |
807 | |
808 | err = -EEXIST; | |
809 | /* First make sure we're not already connected. */ | |
810 | if (sl && sl->magic == SLIP_MAGIC) | |
811 | goto err_exit; | |
812 | ||
813 | /* OK. Find a free SLIP channel to use. */ | |
814 | err = -ENFILE; | |
9ce6cf25 AC |
815 | sl = sl_alloc(tty_devnum(tty)); |
816 | if (sl == NULL) | |
1da177e4 LT |
817 | goto err_exit; |
818 | ||
819 | sl->tty = tty; | |
820 | tty->disc_data = sl; | |
1da177e4 | 821 | sl->pid = current->pid; |
6aa20a22 | 822 | |
1da177e4 LT |
823 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
824 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
825 | err = sl_alloc_bufs(sl, SL_MTU); |
826 | if (err) | |
1da177e4 LT |
827 | goto err_free_chan; |
828 | ||
829 | set_bit(SLF_INUSE, &sl->flags); | |
830 | ||
9ce6cf25 AC |
831 | err = register_netdevice(sl->dev); |
832 | if (err) | |
1da177e4 LT |
833 | goto err_free_bufs; |
834 | } | |
835 | ||
836 | #ifdef CONFIG_SLIP_SMART | |
837 | if (sl->keepalive) { | |
9ce6cf25 AC |
838 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
839 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
840 | } |
841 | if (sl->outfill) { | |
9ce6cf25 AC |
842 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
843 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
844 | } |
845 | #endif | |
846 | ||
847 | /* Done. We have linked the TTY line to a channel. */ | |
848 | rtnl_unlock(); | |
33f0f88f | 849 | tty->receive_room = 65536; /* We don't flow control */ |
057bef93 MI |
850 | |
851 | /* TTY layer expects 0 on success */ | |
852 | return 0; | |
1da177e4 LT |
853 | |
854 | err_free_bufs: | |
855 | sl_free_bufs(sl); | |
856 | ||
857 | err_free_chan: | |
858 | sl->tty = NULL; | |
859 | tty->disc_data = NULL; | |
860 | clear_bit(SLF_INUSE, &sl->flags); | |
861 | ||
862 | err_exit: | |
863 | rtnl_unlock(); | |
864 | ||
865 | /* Count references from TTY module */ | |
866 | return err; | |
867 | } | |
868 | ||
1da177e4 LT |
869 | /* |
870 | * Close down a SLIP channel. | |
871 | * This means flushing out any pending queues, and then returning. This | |
872 | * call is serialized against other ldisc functions. | |
5342b77c AC |
873 | * |
874 | * We also use this method fo a hangup event | |
1da177e4 | 875 | */ |
5342b77c | 876 | |
9ce6cf25 | 877 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 878 | { |
9ce6cf25 | 879 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
880 | |
881 | /* First make sure we're connected. */ | |
882 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
883 | return; | |
884 | ||
661f7fda | 885 | spin_lock_bh(&sl->lock); |
1da177e4 LT |
886 | tty->disc_data = NULL; |
887 | sl->tty = NULL; | |
661f7fda TH |
888 | spin_unlock_bh(&sl->lock); |
889 | ||
890 | flush_work(&sl->tx_work); | |
1da177e4 LT |
891 | |
892 | /* VSV = very important to remove timers */ | |
893 | #ifdef CONFIG_SLIP_SMART | |
894 | del_timer_sync(&sl->keepalive_timer); | |
895 | del_timer_sync(&sl->outfill_timer); | |
896 | #endif | |
5342b77c AC |
897 | /* Flush network side */ |
898 | unregister_netdev(sl->dev); | |
899 | /* This will complete via sl_free_netdev */ | |
1da177e4 LT |
900 | } |
901 | ||
5342b77c AC |
902 | static int slip_hangup(struct tty_struct *tty) |
903 | { | |
904 | slip_close(tty); | |
905 | return 0; | |
906 | } | |
1da177e4 LT |
907 | /************************************************************************ |
908 | * STANDARD SLIP ENCAPSULATION * | |
909 | ************************************************************************/ | |
910 | ||
9ce6cf25 | 911 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
912 | { |
913 | unsigned char *ptr = d; | |
914 | unsigned char c; | |
915 | ||
916 | /* | |
917 | * Send an initial END character to flush out any | |
918 | * data that may have accumulated in the receiver | |
919 | * due to line noise. | |
920 | */ | |
921 | ||
922 | *ptr++ = END; | |
923 | ||
924 | /* | |
925 | * For each byte in the packet, send the appropriate | |
926 | * character sequence, according to the SLIP protocol. | |
927 | */ | |
928 | ||
929 | while (len-- > 0) { | |
9ce6cf25 AC |
930 | switch (c = *s++) { |
931 | case END: | |
1da177e4 LT |
932 | *ptr++ = ESC; |
933 | *ptr++ = ESC_END; | |
934 | break; | |
9ce6cf25 | 935 | case ESC: |
1da177e4 LT |
936 | *ptr++ = ESC; |
937 | *ptr++ = ESC_ESC; | |
938 | break; | |
9ce6cf25 | 939 | default: |
1da177e4 LT |
940 | *ptr++ = c; |
941 | break; | |
942 | } | |
943 | } | |
944 | *ptr++ = END; | |
807540ba | 945 | return ptr - d; |
1da177e4 LT |
946 | } |
947 | ||
948 | static void slip_unesc(struct slip *sl, unsigned char s) | |
949 | { | |
950 | ||
9ce6cf25 AC |
951 | switch (s) { |
952 | case END: | |
1da177e4 LT |
953 | #ifdef CONFIG_SLIP_SMART |
954 | /* drop keeptest bit = VSV */ | |
955 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
956 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
957 | #endif | |
958 | ||
8e95a202 JP |
959 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
960 | (sl->rcount > 2)) | |
1da177e4 | 961 | sl_bump(sl); |
1da177e4 LT |
962 | clear_bit(SLF_ESCAPE, &sl->flags); |
963 | sl->rcount = 0; | |
964 | return; | |
965 | ||
9ce6cf25 | 966 | case ESC: |
1da177e4 LT |
967 | set_bit(SLF_ESCAPE, &sl->flags); |
968 | return; | |
9ce6cf25 AC |
969 | case ESC_ESC: |
970 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 971 | s = ESC; |
1da177e4 | 972 | break; |
9ce6cf25 AC |
973 | case ESC_END: |
974 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 975 | s = END; |
1da177e4 LT |
976 | break; |
977 | } | |
978 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
979 | if (sl->rcount < sl->buffsize) { | |
980 | sl->rbuff[sl->rcount++] = s; | |
981 | return; | |
982 | } | |
034de00b | 983 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
984 | set_bit(SLF_ERROR, &sl->flags); |
985 | } | |
986 | } | |
987 | ||
988 | ||
989 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
990 | /************************************************************************ | |
991 | * 6 BIT SLIP ENCAPSULATION * | |
992 | ************************************************************************/ | |
993 | ||
9ce6cf25 | 994 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
995 | { |
996 | unsigned char *ptr = d; | |
997 | unsigned char c; | |
998 | int i; | |
999 | unsigned short v = 0; | |
1000 | short bits = 0; | |
1001 | ||
1002 | /* | |
1003 | * Send an initial END character to flush out any | |
1004 | * data that may have accumulated in the receiver | |
1005 | * due to line noise. | |
1006 | */ | |
1007 | ||
1008 | *ptr++ = 0x70; | |
1009 | ||
1010 | /* | |
1011 | * Encode the packet into printable ascii characters | |
1012 | */ | |
1013 | ||
1014 | for (i = 0; i < len; ++i) { | |
1015 | v = (v << 8) | s[i]; | |
1016 | bits += 8; | |
1017 | while (bits >= 6) { | |
1018 | bits -= 6; | |
1019 | c = 0x30 + ((v >> bits) & 0x3F); | |
1020 | *ptr++ = c; | |
1021 | } | |
1022 | } | |
1023 | if (bits) { | |
1024 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1025 | *ptr++ = c; | |
1026 | } | |
1027 | *ptr++ = 0x70; | |
1028 | return ptr - d; | |
1029 | } | |
1030 | ||
9ce6cf25 | 1031 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1032 | { |
1033 | unsigned char c; | |
1034 | ||
1035 | if (s == 0x70) { | |
1036 | #ifdef CONFIG_SLIP_SMART | |
1037 | /* drop keeptest bit = VSV */ | |
1038 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1039 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1040 | #endif | |
1041 | ||
8e95a202 JP |
1042 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
1043 | (sl->rcount > 2)) | |
1da177e4 | 1044 | sl_bump(sl); |
1da177e4 LT |
1045 | sl->rcount = 0; |
1046 | sl->xbits = 0; | |
1047 | sl->xdata = 0; | |
9ce6cf25 | 1048 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1049 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1050 | sl->xbits += 6; | |
1051 | if (sl->xbits >= 8) { | |
1052 | sl->xbits -= 8; | |
1053 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1054 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1055 | if (sl->rcount < sl->buffsize) { | |
1056 | sl->rbuff[sl->rcount++] = c; | |
1057 | return; | |
1058 | } | |
034de00b | 1059 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
1060 | set_bit(SLF_ERROR, &sl->flags); |
1061 | } | |
1062 | } | |
9ce6cf25 | 1063 | } |
1da177e4 LT |
1064 | } |
1065 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1066 | ||
1067 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1068 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1069 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1070 | { |
9ce6cf25 | 1071 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1072 | unsigned int tmp; |
1073 | int __user *p = (int __user *)arg; | |
1074 | ||
1075 | /* First make sure we're connected. */ | |
9ce6cf25 | 1076 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1077 | return -EINVAL; |
1da177e4 | 1078 | |
9ce6cf25 AC |
1079 | switch (cmd) { |
1080 | case SIOCGIFNAME: | |
1da177e4 LT |
1081 | tmp = strlen(sl->dev->name) + 1; |
1082 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1083 | return -EFAULT; | |
1084 | return 0; | |
1085 | ||
1086 | case SIOCGIFENCAP: | |
1087 | if (put_user(sl->mode, p)) | |
1088 | return -EFAULT; | |
1089 | return 0; | |
1090 | ||
1091 | case SIOCSIFENCAP: | |
1092 | if (get_user(tmp, p)) | |
1093 | return -EFAULT; | |
1094 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1095 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1096 | return -EINVAL; |
1da177e4 LT |
1097 | #else |
1098 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1099 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1100 | /* return -EINVAL; */ |
1101 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1102 | #endif |
1103 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1104 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1105 | return -EINVAL; |
1da177e4 LT |
1106 | #endif |
1107 | sl->mode = tmp; | |
9ce6cf25 | 1108 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1109 | return 0; |
1110 | ||
9ce6cf25 | 1111 | case SIOCSIFHWADDR: |
1da177e4 LT |
1112 | return -EINVAL; |
1113 | ||
1114 | #ifdef CONFIG_SLIP_SMART | |
1115 | /* VSV changes start here */ | |
9ce6cf25 | 1116 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1117 | if (get_user(tmp, p)) |
1118 | return -EFAULT; | |
9ce6cf25 | 1119 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1120 | return -EINVAL; |
1121 | ||
1122 | spin_lock_bh(&sl->lock); | |
1123 | if (!sl->tty) { | |
1124 | spin_unlock_bh(&sl->lock); | |
1125 | return -ENODEV; | |
1126 | } | |
9ce6cf25 AC |
1127 | sl->keepalive = (u8)tmp; |
1128 | if (sl->keepalive != 0) { | |
1129 | mod_timer(&sl->keepalive_timer, | |
1130 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1131 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1132 | } else |
1133 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1134 | spin_unlock_bh(&sl->lock); |
1135 | return 0; | |
1136 | ||
9ce6cf25 | 1137 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1138 | if (put_user(sl->keepalive, p)) |
1139 | return -EFAULT; | |
1140 | return 0; | |
1141 | ||
9ce6cf25 | 1142 | case SIOCSOUTFILL: |
1da177e4 LT |
1143 | if (get_user(tmp, p)) |
1144 | return -EFAULT; | |
9ce6cf25 | 1145 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1146 | return -EINVAL; |
1147 | spin_lock_bh(&sl->lock); | |
1148 | if (!sl->tty) { | |
1149 | spin_unlock_bh(&sl->lock); | |
1150 | return -ENODEV; | |
1151 | } | |
9ce6cf25 AC |
1152 | sl->outfill = (u8)tmp; |
1153 | if (sl->outfill != 0) { | |
1154 | mod_timer(&sl->outfill_timer, | |
1155 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1156 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1157 | } else |
1158 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1159 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1160 | return 0; |
1da177e4 | 1161 | |
9ce6cf25 | 1162 | case SIOCGOUTFILL: |
1da177e4 LT |
1163 | if (put_user(sl->outfill, p)) |
1164 | return -EFAULT; | |
1165 | return 0; | |
1166 | /* VSV changes end */ | |
1167 | #endif | |
1da177e4 | 1168 | default: |
d0127539 | 1169 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1170 | } |
1171 | } | |
1172 | ||
9646e7ce AB |
1173 | #ifdef CONFIG_COMPAT |
1174 | static long slip_compat_ioctl(struct tty_struct *tty, struct file *file, | |
1175 | unsigned int cmd, unsigned long arg) | |
1176 | { | |
1177 | switch (cmd) { | |
1178 | case SIOCGIFNAME: | |
1179 | case SIOCGIFENCAP: | |
1180 | case SIOCSIFENCAP: | |
1181 | case SIOCSIFHWADDR: | |
1182 | case SIOCSKEEPALIVE: | |
1183 | case SIOCGKEEPALIVE: | |
1184 | case SIOCSOUTFILL: | |
1185 | case SIOCGOUTFILL: | |
1186 | return slip_ioctl(tty, file, cmd, | |
1187 | (unsigned long)compat_ptr(arg)); | |
1188 | } | |
1189 | ||
1190 | return -ENOIOCTLCMD; | |
1191 | } | |
1192 | #endif | |
1193 | ||
1da177e4 LT |
1194 | /* VSV changes start here */ |
1195 | #ifdef CONFIG_SLIP_SMART | |
1196 | /* function do_ioctl called from net/core/dev.c | |
1197 | to allow get/set outfill/keepalive parameter | |
1198 | by ifconfig */ | |
1199 | ||
9ce6cf25 | 1200 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1201 | { |
1202 | struct slip *sl = netdev_priv(dev); | |
1203 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1204 | ||
1205 | if (sl == NULL) /* Allocation failed ?? */ | |
1206 | return -ENODEV; | |
1207 | ||
1208 | spin_lock_bh(&sl->lock); | |
1209 | ||
1210 | if (!sl->tty) { | |
1211 | spin_unlock_bh(&sl->lock); | |
1212 | return -ENODEV; | |
1213 | } | |
1214 | ||
9ce6cf25 AC |
1215 | switch (cmd) { |
1216 | case SIOCSKEEPALIVE: | |
1da177e4 | 1217 | /* max for unchar */ |
9ce6cf25 | 1218 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1219 | spin_unlock_bh(&sl->lock); |
1220 | return -EINVAL; | |
1221 | } | |
9ce6cf25 | 1222 | sl->keepalive = (u8)*p; |
1da177e4 | 1223 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1224 | sl->keepalive_timer.expires = |
1225 | jiffies + sl->keepalive * HZ; | |
1226 | mod_timer(&sl->keepalive_timer, | |
1227 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1228 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1229 | } else |
1230 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1231 | break; |
1232 | ||
9ce6cf25 | 1233 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1234 | *p = sl->keepalive; |
1235 | break; | |
1236 | ||
9ce6cf25 AC |
1237 | case SIOCSOUTFILL: |
1238 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1239 | spin_unlock_bh(&sl->lock); |
1240 | return -EINVAL; | |
1241 | } | |
9ce6cf25 AC |
1242 | sl->outfill = (u8)*p; |
1243 | if (sl->outfill != 0) { | |
1244 | mod_timer(&sl->outfill_timer, | |
1245 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1246 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1247 | } else |
1248 | del_timer(&sl->outfill_timer); | |
1249 | break; | |
1da177e4 | 1250 | |
9ce6cf25 | 1251 | case SIOCGOUTFILL: |
1da177e4 LT |
1252 | *p = sl->outfill; |
1253 | break; | |
1254 | ||
9ce6cf25 | 1255 | case SIOCSLEASE: |
6aa20a22 | 1256 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1257 | and opened by another process device. |
1258 | */ | |
9ce6cf25 AC |
1259 | if (sl->tty != current->signal->tty && |
1260 | sl->pid != current->pid) { | |
1da177e4 LT |
1261 | spin_unlock_bh(&sl->lock); |
1262 | return -EPERM; | |
1263 | } | |
1264 | sl->leased = 0; | |
9ce6cf25 | 1265 | if (*p) |
1da177e4 | 1266 | sl->leased = 1; |
9ce6cf25 | 1267 | break; |
1da177e4 | 1268 | |
9ce6cf25 | 1269 | case SIOCGLEASE: |
1da177e4 | 1270 | *p = sl->leased; |
ee289b64 | 1271 | } |
1da177e4 LT |
1272 | spin_unlock_bh(&sl->lock); |
1273 | return 0; | |
1274 | } | |
1275 | #endif | |
1276 | /* VSV changes end */ | |
1277 | ||
a352def2 | 1278 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 LT |
1279 | .owner = THIS_MODULE, |
1280 | .magic = TTY_LDISC_MAGIC, | |
1281 | .name = "slip", | |
1282 | .open = slip_open, | |
1283 | .close = slip_close, | |
5342b77c | 1284 | .hangup = slip_hangup, |
1da177e4 | 1285 | .ioctl = slip_ioctl, |
9646e7ce AB |
1286 | #ifdef CONFIG_COMPAT |
1287 | .compat_ioctl = slip_compat_ioctl, | |
1288 | #endif | |
1da177e4 | 1289 | .receive_buf = slip_receive_buf, |
1da177e4 LT |
1290 | .write_wakeup = slip_write_wakeup, |
1291 | }; | |
1292 | ||
1293 | static int __init slip_init(void) | |
1294 | { | |
1295 | int status; | |
1296 | ||
1297 | if (slip_maxdev < 4) | |
1298 | slip_maxdev = 4; /* Sanity */ | |
1299 | ||
1300 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1301 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1302 | " (6 bit encapsulation enabled)" | |
1303 | #endif | |
1304 | ".\n", | |
9ce6cf25 | 1305 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1306 | #if defined(SL_INCLUDE_CSLIP) |
1307 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1308 | #endif | |
1309 | #ifdef CONFIG_SLIP_SMART | |
1310 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1311 | #endif | |
1312 | ||
9ce6cf25 AC |
1313 | slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev, |
1314 | GFP_KERNEL); | |
e404decb | 1315 | if (!slip_devs) |
1da177e4 | 1316 | return -ENOMEM; |
1da177e4 | 1317 | |
1da177e4 | 1318 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1319 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1320 | if (status != 0) { | |
1da177e4 LT |
1321 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1322 | kfree(slip_devs); | |
1323 | } | |
1324 | return status; | |
1325 | } | |
1326 | ||
1327 | static void __exit slip_exit(void) | |
1328 | { | |
1329 | int i; | |
1330 | struct net_device *dev; | |
1331 | struct slip *sl; | |
1332 | unsigned long timeout = jiffies + HZ; | |
1333 | int busy = 0; | |
1334 | ||
6aa20a22 | 1335 | if (slip_devs == NULL) |
1da177e4 LT |
1336 | return; |
1337 | ||
1338 | /* First of all: check for active disciplines and hangup them. | |
1339 | */ | |
1340 | do { | |
a9fc2510 NA |
1341 | if (busy) |
1342 | msleep_interruptible(100); | |
1da177e4 LT |
1343 | |
1344 | busy = 0; | |
1345 | for (i = 0; i < slip_maxdev; i++) { | |
1346 | dev = slip_devs[i]; | |
1347 | if (!dev) | |
1348 | continue; | |
1349 | sl = netdev_priv(dev); | |
1350 | spin_lock_bh(&sl->lock); | |
1351 | if (sl->tty) { | |
1352 | busy++; | |
1353 | tty_hangup(sl->tty); | |
1354 | } | |
1355 | spin_unlock_bh(&sl->lock); | |
1356 | } | |
1357 | } while (busy && time_before(jiffies, timeout)); | |
1358 | ||
5342b77c AC |
1359 | /* FIXME: hangup is async so we should wait when doing this second |
1360 | phase */ | |
1da177e4 LT |
1361 | |
1362 | for (i = 0; i < slip_maxdev; i++) { | |
1363 | dev = slip_devs[i]; | |
1364 | if (!dev) | |
1365 | continue; | |
1366 | slip_devs[i] = NULL; | |
1367 | ||
1368 | sl = netdev_priv(dev); | |
1369 | if (sl->tty) { | |
1370 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1371 | dev->name); | |
1372 | /* Intentionally leak the control block. */ | |
1373 | dev->destructor = NULL; | |
6aa20a22 | 1374 | } |
1da177e4 LT |
1375 | |
1376 | unregister_netdev(dev); | |
1377 | } | |
1378 | ||
1379 | kfree(slip_devs); | |
1380 | slip_devs = NULL; | |
1381 | ||
9ce6cf25 AC |
1382 | i = tty_unregister_ldisc(N_SLIP); |
1383 | if (i != 0) | |
1da177e4 | 1384 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | module_init(slip_init); | |
1388 | module_exit(slip_exit); | |
1389 | ||
1390 | #ifdef CONFIG_SLIP_SMART | |
1391 | /* | |
1392 | * This is start of the code for multislip style line checking | |
1393 | * added by Stanislav Voronyi. All changes before marked VSV | |
1394 | */ | |
1395 | ||
1396 | static void sl_outfill(unsigned long sls) | |
1397 | { | |
9ce6cf25 | 1398 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1399 | |
1400 | spin_lock(&sl->lock); | |
1401 | ||
1402 | if (sl->tty == NULL) | |
1403 | goto out; | |
1404 | ||
9ce6cf25 AC |
1405 | if (sl->outfill) { |
1406 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1407 | /* no packets were transmitted, do outfill */ |
1408 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1409 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1410 | #else | |
1411 | unsigned char s = END; | |
1412 | #endif | |
1413 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1414 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1415 | /* if device busy no outfill */ |
f34d7a5b | 1416 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1417 | } |
9ce6cf25 | 1418 | } else |
1da177e4 LT |
1419 | set_bit(SLF_OUTWAIT, &sl->flags); |
1420 | ||
1421 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1422 | } | |
1423 | out: | |
1424 | spin_unlock(&sl->lock); | |
1425 | } | |
1426 | ||
1427 | static void sl_keepalive(unsigned long sls) | |
1428 | { | |
9ce6cf25 | 1429 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1430 | |
1431 | spin_lock(&sl->lock); | |
1432 | ||
1433 | if (sl->tty == NULL) | |
1434 | goto out; | |
1435 | ||
9ce6cf25 AC |
1436 | if (sl->keepalive) { |
1437 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1438 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1439 | if (sl->outfill) |
1440 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1441 | (void)del_timer(&sl->outfill_timer); |
1442 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1443 | /* this must hangup tty & close slip */ |
1444 | tty_hangup(sl->tty); | |
1da177e4 LT |
1445 | /* I think we need not something else */ |
1446 | goto out; | |
9ce6cf25 | 1447 | } else |
1da177e4 LT |
1448 | set_bit(SLF_KEEPTEST, &sl->flags); |
1449 | ||
1450 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1451 | } | |
1da177e4 LT |
1452 | out: |
1453 | spin_unlock(&sl->lock); | |
1454 | } | |
1455 | ||
1456 | #endif | |
1457 | MODULE_LICENSE("GPL"); | |
1458 | MODULE_ALIAS_LDISC(N_SLIP); |