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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * slip.c This module implements the SLIP protocol for kernel-based | |
3 | * devices like TTY. It interfaces between a raw TTY, and the | |
4 | * kernel's INET protocol layers. | |
5 | * | |
6 | * Version: @(#)slip.c 0.8.3 12/24/94 | |
7 | * | |
8 | * Authors: Laurence Culhane, <loz@holmes.demon.co.uk> | |
9 | * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> | |
10 | * | |
11 | * Fixes: | |
12 | * Alan Cox : Sanity checks and avoid tx overruns. | |
13 | * Has a new sl->mtu field. | |
9ce6cf25 AC |
14 | * Alan Cox : Found cause of overrun. ifconfig sl0 |
15 | * mtu upwards. Driver now spots this | |
16 | * and grows/shrinks its buffers(hack!). | |
17 | * Memory leak if you run out of memory | |
18 | * setting up a slip driver fixed. | |
1da177e4 LT |
19 | * Matt Dillon : Printable slip (borrowed from NET2E) |
20 | * Pauline Middelink : Slip driver fixes. | |
21 | * Alan Cox : Honours the old SL_COMPRESSED flag | |
22 | * Alan Cox : KISS AX.25 and AXUI IP support | |
23 | * Michael Riepe : Automatic CSLIP recognition added | |
24 | * Charles Hedrick : CSLIP header length problem fix. | |
25 | * Alan Cox : Corrected non-IP cases of the above. | |
26 | * Alan Cox : Now uses hardware type as per FvK. | |
27 | * Alan Cox : Default to 192.168.0.0 (RFC 1597) | |
28 | * A.N.Kuznetsov : dev_tint() recursion fix. | |
29 | * Dmitry Gorodchanin : SLIP memory leaks | |
30 | * Dmitry Gorodchanin : Code cleanup. Reduce tty driver | |
31 | * buffering from 4096 to 256 bytes. | |
32 | * Improving SLIP response time. | |
33 | * CONFIG_SLIP_MODE_SLIP6. | |
9ce6cf25 AC |
34 | * ifconfig sl? up & down now works |
35 | * correctly. | |
1da177e4 LT |
36 | * Modularization. |
37 | * Alan Cox : Oops - fix AX.25 buffer lengths | |
38 | * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP | |
39 | * statistics. Include CSLIP code only | |
40 | * if it really needed. | |
41 | * Alan Cox : Free slhc buffers in the right place. | |
42 | * Alan Cox : Allow for digipeated IP over AX.25 | |
43 | * Matti Aarnio : Dynamic SLIP devices, with ideas taken | |
44 | * from Jim Freeman's <jfree@caldera.com> | |
45 | * dynamic PPP devices. We do NOT kfree() | |
46 | * device entries, just reg./unreg. them | |
47 | * as they are needed. We kfree() them | |
48 | * at module cleanup. | |
9ce6cf25 AC |
49 | * With MODULE-loading ``insmod'', user |
50 | * can issue parameter: slip_maxdev=1024 | |
51 | * (Or how much he/she wants.. Default | |
52 | * is 256) | |
53 | * Stanislav Voronyi : Slip line checking, with ideas taken | |
54 | * from multislip BSDI driver which was | |
55 | * written by Igor Chechik, RELCOM Corp. | |
56 | * Only algorithms have been ported to | |
57 | * Linux SLIP driver. | |
1da177e4 | 58 | * Vitaly E. Lavrov : Sane behaviour on tty hangup. |
9ce6cf25 AC |
59 | * Alexey Kuznetsov : Cleanup interfaces to tty & netdevice |
60 | * modules. | |
1da177e4 LT |
61 | */ |
62 | ||
63 | #define SL_CHECK_TRANSMIT | |
1da177e4 LT |
64 | #include <linux/module.h> |
65 | #include <linux/moduleparam.h> | |
66 | ||
67 | #include <asm/system.h> | |
68 | #include <asm/uaccess.h> | |
69 | #include <linux/bitops.h> | |
d43c36dc | 70 | #include <linux/sched.h> |
1da177e4 LT |
71 | #include <linux/string.h> |
72 | #include <linux/mm.h> | |
73 | #include <linux/interrupt.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/tty.h> | |
76 | #include <linux/errno.h> | |
77 | #include <linux/netdevice.h> | |
78 | #include <linux/etherdevice.h> | |
79 | #include <linux/skbuff.h> | |
80 | #include <linux/rtnetlink.h> | |
81 | #include <linux/if_arp.h> | |
82 | #include <linux/if_slip.h> | |
9646e7ce | 83 | #include <linux/compat.h> |
12dc2fdd | 84 | #include <linux/delay.h> |
1da177e4 LT |
85 | #include <linux/init.h> |
86 | #include "slip.h" | |
87 | #ifdef CONFIG_INET | |
88 | #include <linux/ip.h> | |
89 | #include <linux/tcp.h> | |
90 | #include <net/slhc_vj.h> | |
91 | #endif | |
92 | ||
93 | #define SLIP_VERSION "0.8.4-NET3.019-NEWTTY" | |
94 | ||
95 | static struct net_device **slip_devs; | |
96 | ||
97 | static int slip_maxdev = SL_NRUNIT; | |
98 | module_param(slip_maxdev, int, 0); | |
99 | MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices"); | |
100 | ||
101 | static int slip_esc(unsigned char *p, unsigned char *d, int len); | |
102 | static void slip_unesc(struct slip *sl, unsigned char c); | |
103 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
104 | static int slip_esc6(unsigned char *p, unsigned char *d, int len); | |
105 | static void slip_unesc6(struct slip *sl, unsigned char c); | |
106 | #endif | |
107 | #ifdef CONFIG_SLIP_SMART | |
108 | static void sl_keepalive(unsigned long sls); | |
109 | static void sl_outfill(unsigned long sls); | |
9ce6cf25 | 110 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); |
1da177e4 LT |
111 | #endif |
112 | ||
113 | /******************************** | |
114 | * Buffer administration routines: | |
115 | * sl_alloc_bufs() | |
116 | * sl_free_bufs() | |
117 | * sl_realloc_bufs() | |
118 | * | |
119 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
120 | * sl_realloc_bufs provides strong atomicity and reallocation | |
121 | * on actively running device. | |
122 | *********************************/ | |
123 | ||
6aa20a22 | 124 | /* |
1da177e4 LT |
125 | Allocate channel buffers. |
126 | */ | |
127 | ||
9ce6cf25 | 128 | static int sl_alloc_bufs(struct slip *sl, int mtu) |
1da177e4 LT |
129 | { |
130 | int err = -ENOBUFS; | |
131 | unsigned long len; | |
9ce6cf25 AC |
132 | char *rbuff = NULL; |
133 | char *xbuff = NULL; | |
1da177e4 | 134 | #ifdef SL_INCLUDE_CSLIP |
9ce6cf25 | 135 | char *cbuff = NULL; |
1da177e4 LT |
136 | struct slcompress *slcomp = NULL; |
137 | #endif | |
138 | ||
139 | /* | |
140 | * Allocate the SLIP frame buffers: | |
141 | * | |
142 | * rbuff Receive buffer. | |
143 | * xbuff Transmit buffer. | |
144 | * cbuff Temporary compression buffer. | |
145 | */ | |
146 | len = mtu * 2; | |
147 | ||
148 | /* | |
149 | * allow for arrival of larger UDP packets, even if we say not to | |
150 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
151 | * an MSS of 128 | |
152 | */ | |
153 | if (len < 576 * 2) | |
154 | len = 576 * 2; | |
155 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
156 | if (rbuff == NULL) | |
157 | goto err_exit; | |
158 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
159 | if (xbuff == NULL) | |
160 | goto err_exit; | |
161 | #ifdef SL_INCLUDE_CSLIP | |
162 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
163 | if (cbuff == NULL) | |
164 | goto err_exit; | |
165 | slcomp = slhc_init(16, 16); | |
166 | if (slcomp == NULL) | |
167 | goto err_exit; | |
168 | #endif | |
169 | spin_lock_bh(&sl->lock); | |
170 | if (sl->tty == NULL) { | |
171 | spin_unlock_bh(&sl->lock); | |
172 | err = -ENODEV; | |
173 | goto err_exit; | |
174 | } | |
175 | sl->mtu = mtu; | |
176 | sl->buffsize = len; | |
177 | sl->rcount = 0; | |
178 | sl->xleft = 0; | |
179 | rbuff = xchg(&sl->rbuff, rbuff); | |
180 | xbuff = xchg(&sl->xbuff, xbuff); | |
181 | #ifdef SL_INCLUDE_CSLIP | |
182 | cbuff = xchg(&sl->cbuff, cbuff); | |
183 | slcomp = xchg(&sl->slcomp, slcomp); | |
184 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
185 | sl->xdata = 0; | |
186 | sl->xbits = 0; | |
187 | #endif | |
188 | #endif | |
189 | spin_unlock_bh(&sl->lock); | |
190 | err = 0; | |
191 | ||
192 | /* Cleanup */ | |
193 | err_exit: | |
194 | #ifdef SL_INCLUDE_CSLIP | |
158a0e45 | 195 | kfree(cbuff); |
1da177e4 LT |
196 | if (slcomp) |
197 | slhc_free(slcomp); | |
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 | |
250 | if (mtu >= sl->mtu) { | |
251 | printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n", | |
252 | dev->name); | |
253 | err = -ENOBUFS; | |
254 | } | |
255 | goto done; | |
256 | } | |
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; | |
273 | sl->tx_dropped++; | |
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; | |
283 | sl->rx_over_errors++; | |
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 LT |
320 | { |
321 | struct sk_buff *skb; | |
322 | int count; | |
323 | ||
324 | count = sl->rcount; | |
325 | #ifdef SL_INCLUDE_CSLIP | |
326 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
9ce6cf25 AC |
327 | unsigned char c = sl->rbuff[0]; |
328 | if (c & SL_TYPE_COMPRESSED_TCP) { | |
1da177e4 LT |
329 | /* ignore compressed packets when CSLIP is off */ |
330 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
331 | printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name); | |
332 | return; | |
333 | } | |
9ce6cf25 AC |
334 | /* make sure we've reserved enough space for uncompress |
335 | to use */ | |
1da177e4 LT |
336 | if (count + 80 > sl->buffsize) { |
337 | sl->rx_over_errors++; | |
338 | return; | |
339 | } | |
340 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
9ce6cf25 | 341 | if (count <= 0) |
1da177e4 | 342 | return; |
1da177e4 LT |
343 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { |
344 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
345 | /* turn on header compression */ | |
346 | sl->mode |= SL_MODE_CSLIP; | |
347 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
348 | printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name); | |
349 | } | |
350 | sl->rbuff[0] &= 0x4f; | |
9ce6cf25 | 351 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) |
1da177e4 | 352 | return; |
1da177e4 LT |
353 | } |
354 | } | |
355 | #endif /* SL_INCLUDE_CSLIP */ | |
356 | ||
9ce6cf25 | 357 | sl->rx_bytes += count; |
6aa20a22 | 358 | |
1da177e4 | 359 | skb = dev_alloc_skb(count); |
9ce6cf25 | 360 | if (skb == NULL) { |
1da177e4 LT |
361 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name); |
362 | sl->rx_dropped++; | |
363 | return; | |
364 | } | |
365 | skb->dev = sl->dev; | |
9ce6cf25 | 366 | memcpy(skb_put(skb, count), sl->rbuff, count); |
98e399f8 | 367 | skb_reset_mac_header(skb); |
9ce6cf25 | 368 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 369 | netif_rx(skb); |
1da177e4 LT |
370 | sl->rx_packets++; |
371 | } | |
372 | ||
373 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
9ce6cf25 | 374 | static void sl_encaps(struct slip *sl, unsigned char *icp, int len) |
1da177e4 LT |
375 | { |
376 | unsigned char *p; | |
377 | int actual, count; | |
378 | ||
379 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
380 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
381 | sl->tx_dropped++; | |
382 | sl_unlock(sl); | |
383 | return; | |
384 | } | |
385 | ||
386 | p = icp; | |
387 | #ifdef SL_INCLUDE_CSLIP | |
9ce6cf25 | 388 | if (sl->mode & SL_MODE_CSLIP) |
1da177e4 | 389 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); |
1da177e4 LT |
390 | #endif |
391 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 392 | if (sl->mode & SL_MODE_SLIP6) |
1da177e4 LT |
393 | count = slip_esc6(p, (unsigned char *) sl->xbuff, len); |
394 | else | |
395 | #endif | |
396 | count = slip_esc(p, (unsigned char *) sl->xbuff, len); | |
397 | ||
398 | /* Order of next two lines is *very* important. | |
399 | * When we are sending a little amount of data, | |
f34d7a5b | 400 | * the transfer may be completed inside the ops->write() |
1da177e4 LT |
401 | * routine, because it's running with interrupts enabled. |
402 | * In this case we *never* got WRITE_WAKEUP event, | |
403 | * if we did not request it before write operation. | |
404 | * 14 Oct 1994 Dmitry Gorodchanin. | |
405 | */ | |
8a1ec21e | 406 | set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
f34d7a5b | 407 | actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
1da177e4 LT |
408 | #ifdef SL_CHECK_TRANSMIT |
409 | sl->dev->trans_start = jiffies; | |
410 | #endif | |
411 | sl->xleft = count - actual; | |
412 | sl->xhead = sl->xbuff + actual; | |
413 | #ifdef CONFIG_SLIP_SMART | |
414 | /* VSV */ | |
415 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
416 | #endif | |
417 | } | |
418 | ||
419 | /* | |
420 | * Called by the driver when there's room for more data. If we have | |
421 | * more packets to send, we send them here. | |
422 | */ | |
423 | static void slip_write_wakeup(struct tty_struct *tty) | |
424 | { | |
425 | int actual; | |
9ce6cf25 | 426 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
427 | |
428 | /* First make sure we're connected. */ | |
9ce6cf25 | 429 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 | 430 | return; |
9ce6cf25 | 431 | |
1da177e4 LT |
432 | if (sl->xleft <= 0) { |
433 | /* Now serial buffer is almost free & we can start | |
434 | * transmission of another packet */ | |
435 | sl->tx_packets++; | |
8a1ec21e | 436 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
1da177e4 LT |
437 | sl_unlock(sl); |
438 | return; | |
439 | } | |
440 | ||
f34d7a5b | 441 | actual = tty->ops->write(tty, sl->xhead, sl->xleft); |
1da177e4 LT |
442 | sl->xleft -= actual; |
443 | sl->xhead += actual; | |
444 | } | |
445 | ||
446 | static void sl_tx_timeout(struct net_device *dev) | |
447 | { | |
448 | struct slip *sl = netdev_priv(dev); | |
449 | ||
450 | spin_lock(&sl->lock); | |
451 | ||
452 | if (netif_queue_stopped(dev)) { | |
453 | if (!netif_running(dev)) | |
454 | goto out; | |
455 | ||
456 | /* May be we must check transmitter timeout here ? | |
457 | * 14 Oct 1994 Dmitry Gorodchanin. | |
458 | */ | |
459 | #ifdef SL_CHECK_TRANSMIT | |
460 | if (time_before(jiffies, dev->trans_start + 20 * HZ)) { | |
461 | /* 20 sec timeout not reached */ | |
462 | goto out; | |
463 | } | |
9ce6cf25 AC |
464 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", |
465 | dev->name, | |
f34d7a5b | 466 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
9ce6cf25 | 467 | "bad line quality" : "driver error"); |
1da177e4 | 468 | sl->xleft = 0; |
8a1ec21e | 469 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
470 | sl_unlock(sl); |
471 | #endif | |
472 | } | |
1da177e4 LT |
473 | out: |
474 | spin_unlock(&sl->lock); | |
475 | } | |
476 | ||
477 | ||
478 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
424efe9c | 479 | static netdev_tx_t |
1da177e4 LT |
480 | sl_xmit(struct sk_buff *skb, struct net_device *dev) |
481 | { | |
482 | struct slip *sl = netdev_priv(dev); | |
483 | ||
484 | spin_lock(&sl->lock); | |
9ce6cf25 | 485 | if (!netif_running(dev)) { |
1da177e4 LT |
486 | spin_unlock(&sl->lock); |
487 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
488 | dev_kfree_skb(skb); | |
6ed10654 | 489 | return NETDEV_TX_OK; |
1da177e4 LT |
490 | } |
491 | if (sl->tty == NULL) { | |
492 | spin_unlock(&sl->lock); | |
493 | dev_kfree_skb(skb); | |
6ed10654 | 494 | return NETDEV_TX_OK; |
1da177e4 LT |
495 | } |
496 | ||
497 | sl_lock(sl); | |
9ce6cf25 | 498 | sl->tx_bytes += skb->len; |
1da177e4 LT |
499 | sl_encaps(sl, skb->data, skb->len); |
500 | spin_unlock(&sl->lock); | |
501 | ||
502 | dev_kfree_skb(skb); | |
6ed10654 | 503 | return NETDEV_TX_OK; |
1da177e4 LT |
504 | } |
505 | ||
506 | ||
507 | /****************************************** | |
508 | * Routines looking at netdevice side. | |
509 | ******************************************/ | |
510 | ||
511 | /* Netdevice UP -> DOWN routine */ | |
512 | ||
513 | static int | |
514 | sl_close(struct net_device *dev) | |
515 | { | |
516 | struct slip *sl = netdev_priv(dev); | |
517 | ||
518 | spin_lock_bh(&sl->lock); | |
8a1ec21e | 519 | if (sl->tty) |
1da177e4 | 520 | /* TTY discipline is running. */ |
8a1ec21e | 521 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
522 | netif_stop_queue(dev); |
523 | sl->rcount = 0; | |
524 | sl->xleft = 0; | |
525 | spin_unlock_bh(&sl->lock); | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | /* Netdevice DOWN -> UP routine */ | |
531 | ||
532 | static int sl_open(struct net_device *dev) | |
533 | { | |
534 | struct slip *sl = netdev_priv(dev); | |
535 | ||
9ce6cf25 | 536 | if (sl->tty == NULL) |
1da177e4 LT |
537 | return -ENODEV; |
538 | ||
539 | sl->flags &= (1 << SLF_INUSE); | |
540 | netif_start_queue(dev); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* Netdevice change MTU request */ | |
545 | ||
546 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
547 | { | |
548 | struct slip *sl = netdev_priv(dev); | |
549 | ||
550 | if (new_mtu < 68 || new_mtu > 65534) | |
551 | return -EINVAL; | |
552 | ||
553 | if (new_mtu != dev->mtu) | |
554 | return sl_realloc_bufs(sl, new_mtu); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | /* Netdevice get statistics request */ | |
559 | ||
560 | static struct net_device_stats * | |
561 | sl_get_stats(struct net_device *dev) | |
562 | { | |
563 | static struct net_device_stats stats; | |
564 | struct slip *sl = netdev_priv(dev); | |
565 | #ifdef SL_INCLUDE_CSLIP | |
566 | struct slcompress *comp; | |
567 | #endif | |
568 | ||
569 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
570 | ||
571 | stats.rx_packets = sl->rx_packets; | |
572 | stats.tx_packets = sl->tx_packets; | |
573 | stats.rx_bytes = sl->rx_bytes; | |
574 | stats.tx_bytes = sl->tx_bytes; | |
575 | stats.rx_dropped = sl->rx_dropped; | |
576 | stats.tx_dropped = sl->tx_dropped; | |
577 | stats.tx_errors = sl->tx_errors; | |
578 | stats.rx_errors = sl->rx_errors; | |
579 | stats.rx_over_errors = sl->rx_over_errors; | |
580 | #ifdef SL_INCLUDE_CSLIP | |
581 | stats.rx_fifo_errors = sl->rx_compressed; | |
582 | stats.tx_fifo_errors = sl->tx_compressed; | |
583 | stats.collisions = sl->tx_misses; | |
584 | comp = sl->slcomp; | |
585 | if (comp) { | |
586 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
587 | stats.rx_dropped += comp->sls_i_tossed; | |
588 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
589 | stats.collisions += comp->sls_o_misses; | |
590 | } | |
591 | #endif /* CONFIG_INET */ | |
592 | return (&stats); | |
593 | } | |
594 | ||
595 | /* Netdevice register callback */ | |
596 | ||
597 | static int sl_init(struct net_device *dev) | |
598 | { | |
599 | struct slip *sl = netdev_priv(dev); | |
600 | ||
601 | /* | |
6aa20a22 | 602 | * Finish setting up the DEVICE info. |
1da177e4 LT |
603 | */ |
604 | ||
605 | dev->mtu = sl->mtu; | |
606 | dev->type = ARPHRD_SLIP + sl->mode; | |
607 | #ifdef SL_CHECK_TRANSMIT | |
1da177e4 LT |
608 | dev->watchdog_timeo = 20*HZ; |
609 | #endif | |
610 | return 0; | |
611 | } | |
612 | ||
613 | ||
614 | static void sl_uninit(struct net_device *dev) | |
615 | { | |
616 | struct slip *sl = netdev_priv(dev); | |
617 | ||
618 | sl_free_bufs(sl); | |
619 | } | |
620 | ||
5342b77c AC |
621 | /* Hook the destructor so we can free slip devices at the right point in time */ |
622 | static void sl_free_netdev(struct net_device *dev) | |
623 | { | |
624 | int i = dev->base_addr; | |
625 | free_netdev(dev); | |
626 | slip_devs[i] = NULL; | |
627 | } | |
628 | ||
b1da683d SH |
629 | static const struct net_device_ops sl_netdev_ops = { |
630 | .ndo_init = sl_init, | |
631 | .ndo_uninit = sl_uninit, | |
632 | .ndo_open = sl_open, | |
633 | .ndo_stop = sl_close, | |
634 | .ndo_start_xmit = sl_xmit, | |
635 | .ndo_get_stats = sl_get_stats, | |
636 | .ndo_change_mtu = sl_change_mtu, | |
637 | .ndo_tx_timeout = sl_tx_timeout, | |
638 | #ifdef CONFIG_SLIP_SMART | |
639 | .ndo_do_ioctl = sl_ioctl, | |
640 | #endif | |
641 | }; | |
642 | ||
643 | ||
1da177e4 LT |
644 | static void sl_setup(struct net_device *dev) |
645 | { | |
b1da683d | 646 | dev->netdev_ops = &sl_netdev_ops; |
5342b77c | 647 | dev->destructor = sl_free_netdev; |
b1da683d | 648 | |
1da177e4 LT |
649 | dev->hard_header_len = 0; |
650 | dev->addr_len = 0; | |
651 | dev->tx_queue_len = 10; | |
652 | ||
1da177e4 LT |
653 | /* New-style flags. */ |
654 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
655 | } | |
656 | ||
657 | /****************************************** | |
658 | Routines looking at TTY side. | |
659 | ******************************************/ | |
660 | ||
661 | ||
1da177e4 LT |
662 | /* |
663 | * Handle the 'receiver data ready' interrupt. | |
664 | * This function is called by the 'tty_io' module in the kernel when | |
665 | * a block of SLIP data has been received, which can now be decapsulated | |
666 | * and sent on to some IP layer for further processing. This will not | |
667 | * be re-entered while running but other ldisc functions may be called | |
668 | * in parallel | |
669 | */ | |
6aa20a22 | 670 | |
9ce6cf25 AC |
671 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
672 | char *fp, int count) | |
1da177e4 | 673 | { |
9ce6cf25 | 674 | struct slip *sl = tty->disc_data; |
1da177e4 | 675 | |
9ce6cf25 | 676 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 LT |
677 | return; |
678 | ||
679 | /* Read the characters out of the buffer */ | |
680 | while (count--) { | |
681 | if (fp && *fp++) { | |
9ce6cf25 | 682 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
1da177e4 | 683 | sl->rx_errors++; |
1da177e4 LT |
684 | cp++; |
685 | continue; | |
686 | } | |
687 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
688 | if (sl->mode & SL_MODE_SLIP6) | |
689 | slip_unesc6(sl, *cp++); | |
690 | else | |
691 | #endif | |
692 | slip_unesc(sl, *cp++); | |
693 | } | |
694 | } | |
695 | ||
696 | /************************************ | |
697 | * slip_open helper routines. | |
698 | ************************************/ | |
699 | ||
700 | /* Collect hanged up channels */ | |
1da177e4 LT |
701 | static void sl_sync(void) |
702 | { | |
703 | int i; | |
704 | struct net_device *dev; | |
705 | struct slip *sl; | |
706 | ||
707 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
708 | dev = slip_devs[i]; |
709 | if (dev == NULL) | |
1da177e4 LT |
710 | break; |
711 | ||
712 | sl = netdev_priv(dev); | |
713 | if (sl->tty || sl->leased) | |
714 | continue; | |
9ce6cf25 | 715 | if (dev->flags & IFF_UP) |
1da177e4 LT |
716 | dev_close(dev); |
717 | } | |
718 | } | |
719 | ||
720 | ||
721 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
9ce6cf25 | 722 | static struct slip *sl_alloc(dev_t line) |
1da177e4 LT |
723 | { |
724 | int i; | |
1da177e4 LT |
725 | struct net_device *dev = NULL; |
726 | struct slip *sl; | |
727 | ||
6aa20a22 | 728 | if (slip_devs == NULL) |
1da177e4 LT |
729 | return NULL; /* Master array missing ! */ |
730 | ||
731 | for (i = 0; i < slip_maxdev; i++) { | |
732 | dev = slip_devs[i]; | |
733 | if (dev == NULL) | |
734 | break; | |
1da177e4 | 735 | } |
1da177e4 LT |
736 | /* Sorry, too many, all slots in use */ |
737 | if (i >= slip_maxdev) | |
738 | return NULL; | |
739 | ||
740 | if (dev) { | |
741 | sl = netdev_priv(dev); | |
742 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
743 | unregister_netdevice(dev); | |
744 | dev = NULL; | |
745 | slip_devs[i] = NULL; | |
746 | } | |
747 | } | |
6aa20a22 | 748 | |
1da177e4 LT |
749 | if (!dev) { |
750 | char name[IFNAMSIZ]; | |
751 | sprintf(name, "sl%d", i); | |
752 | ||
753 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
754 | if (!dev) | |
755 | return NULL; | |
756 | dev->base_addr = i; | |
757 | } | |
758 | ||
759 | sl = netdev_priv(dev); | |
760 | ||
761 | /* Initialize channel control data */ | |
762 | sl->magic = SLIP_MAGIC; | |
763 | sl->dev = dev; | |
764 | spin_lock_init(&sl->lock); | |
765 | sl->mode = SL_MODE_DEFAULT; | |
766 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
767 | /* initialize timer_list struct */ |
768 | init_timer(&sl->keepalive_timer); | |
769 | sl->keepalive_timer.data = (unsigned long)sl; | |
770 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 771 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
772 | sl->outfill_timer.data = (unsigned long)sl; |
773 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
774 | #endif |
775 | slip_devs[i] = dev; | |
1da177e4 LT |
776 | return sl; |
777 | } | |
778 | ||
779 | /* | |
780 | * Open the high-level part of the SLIP channel. | |
781 | * This function is called by the TTY module when the | |
782 | * SLIP line discipline is called for. Because we are | |
783 | * sure the tty line exists, we only have to link it to | |
784 | * a free SLIP channel... | |
785 | * | |
786 | * Called in process context serialized from other ldisc calls. | |
787 | */ | |
788 | ||
789 | static int slip_open(struct tty_struct *tty) | |
790 | { | |
791 | struct slip *sl; | |
792 | int err; | |
793 | ||
9ce6cf25 | 794 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 795 | return -EPERM; |
6aa20a22 | 796 | |
f34d7a5b AC |
797 | if (tty->ops->write == NULL) |
798 | return -EOPNOTSUPP; | |
799 | ||
1da177e4 LT |
800 | /* RTnetlink lock is misused here to serialize concurrent |
801 | opens of slip channels. There are better ways, but it is | |
802 | the simplest one. | |
803 | */ | |
804 | rtnl_lock(); | |
805 | ||
806 | /* Collect hanged up channels. */ | |
807 | sl_sync(); | |
808 | ||
9ce6cf25 | 809 | sl = tty->disc_data; |
1da177e4 LT |
810 | |
811 | err = -EEXIST; | |
812 | /* First make sure we're not already connected. */ | |
813 | if (sl && sl->magic == SLIP_MAGIC) | |
814 | goto err_exit; | |
815 | ||
816 | /* OK. Find a free SLIP channel to use. */ | |
817 | err = -ENFILE; | |
9ce6cf25 AC |
818 | sl = sl_alloc(tty_devnum(tty)); |
819 | if (sl == NULL) | |
1da177e4 LT |
820 | goto err_exit; |
821 | ||
822 | sl->tty = tty; | |
823 | tty->disc_data = sl; | |
824 | sl->line = tty_devnum(tty); | |
825 | sl->pid = current->pid; | |
6aa20a22 | 826 | |
1da177e4 LT |
827 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
828 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
829 | err = sl_alloc_bufs(sl, SL_MTU); |
830 | if (err) | |
1da177e4 LT |
831 | goto err_free_chan; |
832 | ||
833 | set_bit(SLF_INUSE, &sl->flags); | |
834 | ||
9ce6cf25 AC |
835 | err = register_netdevice(sl->dev); |
836 | if (err) | |
1da177e4 LT |
837 | goto err_free_bufs; |
838 | } | |
839 | ||
840 | #ifdef CONFIG_SLIP_SMART | |
841 | if (sl->keepalive) { | |
9ce6cf25 AC |
842 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
843 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
844 | } |
845 | if (sl->outfill) { | |
9ce6cf25 AC |
846 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
847 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
848 | } |
849 | #endif | |
850 | ||
851 | /* Done. We have linked the TTY line to a channel. */ | |
852 | rtnl_unlock(); | |
33f0f88f | 853 | tty->receive_room = 65536; /* We don't flow control */ |
1da177e4 LT |
854 | return sl->dev->base_addr; |
855 | ||
856 | err_free_bufs: | |
857 | sl_free_bufs(sl); | |
858 | ||
859 | err_free_chan: | |
860 | sl->tty = NULL; | |
861 | tty->disc_data = NULL; | |
862 | clear_bit(SLF_INUSE, &sl->flags); | |
863 | ||
864 | err_exit: | |
865 | rtnl_unlock(); | |
866 | ||
867 | /* Count references from TTY module */ | |
868 | return err; | |
869 | } | |
870 | ||
1da177e4 LT |
871 | /* |
872 | * Close down a SLIP channel. | |
873 | * This means flushing out any pending queues, and then returning. This | |
874 | * call is serialized against other ldisc functions. | |
5342b77c AC |
875 | * |
876 | * We also use this method fo a hangup event | |
1da177e4 | 877 | */ |
5342b77c | 878 | |
9ce6cf25 | 879 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 880 | { |
9ce6cf25 | 881 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
882 | |
883 | /* First make sure we're connected. */ | |
884 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
885 | return; | |
886 | ||
887 | tty->disc_data = NULL; | |
888 | sl->tty = NULL; | |
889 | if (!sl->leased) | |
890 | sl->line = 0; | |
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; | |
945 | return (ptr - d); | |
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 | } | |
983 | sl->rx_over_errors++; | |
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 | } | |
1059 | sl->rx_over_errors++; | |
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 LT |
1270 | *p = sl->leased; |
1271 | }; | |
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); | |
1da177e4 | 1315 | if (!slip_devs) { |
9ce6cf25 | 1316 | printk(KERN_ERR "SLIP: Can't allocate slip devices array.\n"); |
1da177e4 LT |
1317 | return -ENOMEM; |
1318 | } | |
1319 | ||
1da177e4 | 1320 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1321 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1322 | if (status != 0) { | |
1da177e4 LT |
1323 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1324 | kfree(slip_devs); | |
1325 | } | |
1326 | return status; | |
1327 | } | |
1328 | ||
1329 | static void __exit slip_exit(void) | |
1330 | { | |
1331 | int i; | |
1332 | struct net_device *dev; | |
1333 | struct slip *sl; | |
1334 | unsigned long timeout = jiffies + HZ; | |
1335 | int busy = 0; | |
1336 | ||
6aa20a22 | 1337 | if (slip_devs == NULL) |
1da177e4 LT |
1338 | return; |
1339 | ||
1340 | /* First of all: check for active disciplines and hangup them. | |
1341 | */ | |
1342 | do { | |
a9fc2510 NA |
1343 | if (busy) |
1344 | msleep_interruptible(100); | |
1da177e4 LT |
1345 | |
1346 | busy = 0; | |
1347 | for (i = 0; i < slip_maxdev; i++) { | |
1348 | dev = slip_devs[i]; | |
1349 | if (!dev) | |
1350 | continue; | |
1351 | sl = netdev_priv(dev); | |
1352 | spin_lock_bh(&sl->lock); | |
1353 | if (sl->tty) { | |
1354 | busy++; | |
1355 | tty_hangup(sl->tty); | |
1356 | } | |
1357 | spin_unlock_bh(&sl->lock); | |
1358 | } | |
1359 | } while (busy && time_before(jiffies, timeout)); | |
1360 | ||
5342b77c AC |
1361 | /* FIXME: hangup is async so we should wait when doing this second |
1362 | phase */ | |
1da177e4 LT |
1363 | |
1364 | for (i = 0; i < slip_maxdev; i++) { | |
1365 | dev = slip_devs[i]; | |
1366 | if (!dev) | |
1367 | continue; | |
1368 | slip_devs[i] = NULL; | |
1369 | ||
1370 | sl = netdev_priv(dev); | |
1371 | if (sl->tty) { | |
1372 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1373 | dev->name); | |
1374 | /* Intentionally leak the control block. */ | |
1375 | dev->destructor = NULL; | |
6aa20a22 | 1376 | } |
1da177e4 LT |
1377 | |
1378 | unregister_netdev(dev); | |
1379 | } | |
1380 | ||
1381 | kfree(slip_devs); | |
1382 | slip_devs = NULL; | |
1383 | ||
9ce6cf25 AC |
1384 | i = tty_unregister_ldisc(N_SLIP); |
1385 | if (i != 0) | |
1da177e4 | 1386 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | module_init(slip_init); | |
1390 | module_exit(slip_exit); | |
1391 | ||
1392 | #ifdef CONFIG_SLIP_SMART | |
1393 | /* | |
1394 | * This is start of the code for multislip style line checking | |
1395 | * added by Stanislav Voronyi. All changes before marked VSV | |
1396 | */ | |
1397 | ||
1398 | static void sl_outfill(unsigned long sls) | |
1399 | { | |
9ce6cf25 | 1400 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1401 | |
1402 | spin_lock(&sl->lock); | |
1403 | ||
1404 | if (sl->tty == NULL) | |
1405 | goto out; | |
1406 | ||
9ce6cf25 AC |
1407 | if (sl->outfill) { |
1408 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1409 | /* no packets were transmitted, do outfill */ |
1410 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1411 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1412 | #else | |
1413 | unsigned char s = END; | |
1414 | #endif | |
1415 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1416 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1417 | /* if device busy no outfill */ |
f34d7a5b | 1418 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1419 | } |
9ce6cf25 | 1420 | } else |
1da177e4 LT |
1421 | set_bit(SLF_OUTWAIT, &sl->flags); |
1422 | ||
1423 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1424 | } | |
1425 | out: | |
1426 | spin_unlock(&sl->lock); | |
1427 | } | |
1428 | ||
1429 | static void sl_keepalive(unsigned long sls) | |
1430 | { | |
9ce6cf25 | 1431 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1432 | |
1433 | spin_lock(&sl->lock); | |
1434 | ||
1435 | if (sl->tty == NULL) | |
1436 | goto out; | |
1437 | ||
9ce6cf25 AC |
1438 | if (sl->keepalive) { |
1439 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1440 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1441 | if (sl->outfill) |
1442 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1443 | (void)del_timer(&sl->outfill_timer); |
1444 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1445 | /* this must hangup tty & close slip */ |
1446 | tty_hangup(sl->tty); | |
1da177e4 LT |
1447 | /* I think we need not something else */ |
1448 | goto out; | |
9ce6cf25 | 1449 | } else |
1da177e4 LT |
1450 | set_bit(SLF_KEEPTEST, &sl->flags); |
1451 | ||
1452 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1453 | } | |
1da177e4 LT |
1454 | out: |
1455 | spin_unlock(&sl->lock); | |
1456 | } | |
1457 | ||
1458 | #endif | |
1459 | MODULE_LICENSE("GPL"); | |
1460 | MODULE_ALIAS_LDISC(N_SLIP); |