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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> | |
12dc2fdd | 83 | #include <linux/delay.h> |
1da177e4 LT |
84 | #include <linux/init.h> |
85 | #include "slip.h" | |
86 | #ifdef CONFIG_INET | |
87 | #include <linux/ip.h> | |
88 | #include <linux/tcp.h> | |
89 | #include <net/slhc_vj.h> | |
90 | #endif | |
91 | ||
92 | #define SLIP_VERSION "0.8.4-NET3.019-NEWTTY" | |
93 | ||
94 | static struct net_device **slip_devs; | |
95 | ||
96 | static int slip_maxdev = SL_NRUNIT; | |
97 | module_param(slip_maxdev, int, 0); | |
98 | MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices"); | |
99 | ||
100 | static int slip_esc(unsigned char *p, unsigned char *d, int len); | |
101 | static void slip_unesc(struct slip *sl, unsigned char c); | |
102 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
103 | static int slip_esc6(unsigned char *p, unsigned char *d, int len); | |
104 | static void slip_unesc6(struct slip *sl, unsigned char c); | |
105 | #endif | |
106 | #ifdef CONFIG_SLIP_SMART | |
107 | static void sl_keepalive(unsigned long sls); | |
108 | static void sl_outfill(unsigned long sls); | |
9ce6cf25 | 109 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); |
1da177e4 LT |
110 | #endif |
111 | ||
112 | /******************************** | |
113 | * Buffer administration routines: | |
114 | * sl_alloc_bufs() | |
115 | * sl_free_bufs() | |
116 | * sl_realloc_bufs() | |
117 | * | |
118 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
119 | * sl_realloc_bufs provides strong atomicity and reallocation | |
120 | * on actively running device. | |
121 | *********************************/ | |
122 | ||
6aa20a22 | 123 | /* |
1da177e4 LT |
124 | Allocate channel buffers. |
125 | */ | |
126 | ||
9ce6cf25 | 127 | static int sl_alloc_bufs(struct slip *sl, int mtu) |
1da177e4 LT |
128 | { |
129 | int err = -ENOBUFS; | |
130 | unsigned long len; | |
9ce6cf25 AC |
131 | char *rbuff = NULL; |
132 | char *xbuff = NULL; | |
1da177e4 | 133 | #ifdef SL_INCLUDE_CSLIP |
9ce6cf25 | 134 | char *cbuff = NULL; |
1da177e4 LT |
135 | struct slcompress *slcomp = NULL; |
136 | #endif | |
137 | ||
138 | /* | |
139 | * Allocate the SLIP frame buffers: | |
140 | * | |
141 | * rbuff Receive buffer. | |
142 | * xbuff Transmit buffer. | |
143 | * cbuff Temporary compression buffer. | |
144 | */ | |
145 | len = mtu * 2; | |
146 | ||
147 | /* | |
148 | * allow for arrival of larger UDP packets, even if we say not to | |
149 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
150 | * an MSS of 128 | |
151 | */ | |
152 | if (len < 576 * 2) | |
153 | len = 576 * 2; | |
154 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
155 | if (rbuff == NULL) | |
156 | goto err_exit; | |
157 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
158 | if (xbuff == NULL) | |
159 | goto err_exit; | |
160 | #ifdef SL_INCLUDE_CSLIP | |
161 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
162 | if (cbuff == NULL) | |
163 | goto err_exit; | |
164 | slcomp = slhc_init(16, 16); | |
165 | if (slcomp == NULL) | |
166 | goto err_exit; | |
167 | #endif | |
168 | spin_lock_bh(&sl->lock); | |
169 | if (sl->tty == NULL) { | |
170 | spin_unlock_bh(&sl->lock); | |
171 | err = -ENODEV; | |
172 | goto err_exit; | |
173 | } | |
174 | sl->mtu = mtu; | |
175 | sl->buffsize = len; | |
176 | sl->rcount = 0; | |
177 | sl->xleft = 0; | |
178 | rbuff = xchg(&sl->rbuff, rbuff); | |
179 | xbuff = xchg(&sl->xbuff, xbuff); | |
180 | #ifdef SL_INCLUDE_CSLIP | |
181 | cbuff = xchg(&sl->cbuff, cbuff); | |
182 | slcomp = xchg(&sl->slcomp, slcomp); | |
183 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
184 | sl->xdata = 0; | |
185 | sl->xbits = 0; | |
186 | #endif | |
187 | #endif | |
188 | spin_unlock_bh(&sl->lock); | |
189 | err = 0; | |
190 | ||
191 | /* Cleanup */ | |
192 | err_exit: | |
193 | #ifdef SL_INCLUDE_CSLIP | |
158a0e45 | 194 | kfree(cbuff); |
1da177e4 LT |
195 | if (slcomp) |
196 | slhc_free(slcomp); | |
197 | #endif | |
158a0e45 JJ |
198 | kfree(xbuff); |
199 | kfree(rbuff); | |
1da177e4 LT |
200 | return err; |
201 | } | |
202 | ||
203 | /* Free a SLIP channel buffers. */ | |
9ce6cf25 | 204 | static void sl_free_bufs(struct slip *sl) |
1da177e4 | 205 | { |
1da177e4 | 206 | /* Free all SLIP frame buffers. */ |
9b200b02 JJ |
207 | kfree(xchg(&sl->rbuff, NULL)); |
208 | kfree(xchg(&sl->xbuff, NULL)); | |
1da177e4 | 209 | #ifdef SL_INCLUDE_CSLIP |
9b200b02 JJ |
210 | kfree(xchg(&sl->cbuff, NULL)); |
211 | slhc_free(xchg(&sl->slcomp, NULL)); | |
1da177e4 LT |
212 | #endif |
213 | } | |
214 | ||
6aa20a22 | 215 | /* |
1da177e4 LT |
216 | Reallocate slip channel buffers. |
217 | */ | |
218 | ||
219 | static int sl_realloc_bufs(struct slip *sl, int mtu) | |
220 | { | |
221 | int err = 0; | |
222 | struct net_device *dev = sl->dev; | |
223 | unsigned char *xbuff, *rbuff; | |
224 | #ifdef SL_INCLUDE_CSLIP | |
225 | unsigned char *cbuff; | |
226 | #endif | |
227 | int len = mtu * 2; | |
228 | ||
229 | /* | |
230 | * allow for arrival of larger UDP packets, even if we say not to | |
231 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
232 | * an MSS of 128 | |
233 | */ | |
234 | if (len < 576 * 2) | |
235 | len = 576 * 2; | |
236 | ||
5cbded58 RD |
237 | xbuff = kmalloc(len + 4, GFP_ATOMIC); |
238 | rbuff = kmalloc(len + 4, GFP_ATOMIC); | |
1da177e4 | 239 | #ifdef SL_INCLUDE_CSLIP |
5cbded58 | 240 | cbuff = kmalloc(len + 4, GFP_ATOMIC); |
1da177e4 LT |
241 | #endif |
242 | ||
243 | ||
244 | #ifdef SL_INCLUDE_CSLIP | |
245 | if (xbuff == NULL || rbuff == NULL || cbuff == NULL) { | |
246 | #else | |
247 | if (xbuff == NULL || rbuff == NULL) { | |
248 | #endif | |
249 | if (mtu >= sl->mtu) { | |
250 | printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n", | |
251 | dev->name); | |
252 | err = -ENOBUFS; | |
253 | } | |
254 | goto done; | |
255 | } | |
1da177e4 LT |
256 | spin_lock_bh(&sl->lock); |
257 | ||
258 | err = -ENODEV; | |
259 | if (sl->tty == NULL) | |
260 | goto done_on_bh; | |
261 | ||
262 | xbuff = xchg(&sl->xbuff, xbuff); | |
263 | rbuff = xchg(&sl->rbuff, rbuff); | |
264 | #ifdef SL_INCLUDE_CSLIP | |
265 | cbuff = xchg(&sl->cbuff, cbuff); | |
266 | #endif | |
267 | if (sl->xleft) { | |
268 | if (sl->xleft <= len) { | |
269 | memcpy(sl->xbuff, sl->xhead, sl->xleft); | |
270 | } else { | |
271 | sl->xleft = 0; | |
272 | sl->tx_dropped++; | |
273 | } | |
274 | } | |
275 | sl->xhead = sl->xbuff; | |
276 | ||
277 | if (sl->rcount) { | |
278 | if (sl->rcount <= len) { | |
279 | memcpy(sl->rbuff, rbuff, sl->rcount); | |
280 | } else { | |
281 | sl->rcount = 0; | |
282 | sl->rx_over_errors++; | |
283 | set_bit(SLF_ERROR, &sl->flags); | |
284 | } | |
285 | } | |
286 | sl->mtu = mtu; | |
287 | dev->mtu = mtu; | |
288 | sl->buffsize = len; | |
289 | err = 0; | |
290 | ||
291 | done_on_bh: | |
292 | spin_unlock_bh(&sl->lock); | |
293 | ||
294 | done: | |
158a0e45 JJ |
295 | kfree(xbuff); |
296 | kfree(rbuff); | |
1da177e4 | 297 | #ifdef SL_INCLUDE_CSLIP |
158a0e45 | 298 | kfree(cbuff); |
1da177e4 LT |
299 | #endif |
300 | return err; | |
301 | } | |
302 | ||
303 | ||
304 | /* Set the "sending" flag. This must be atomic hence the set_bit. */ | |
9ce6cf25 | 305 | static inline void sl_lock(struct slip *sl) |
1da177e4 LT |
306 | { |
307 | netif_stop_queue(sl->dev); | |
308 | } | |
309 | ||
310 | ||
311 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ | |
9ce6cf25 | 312 | static inline void sl_unlock(struct slip *sl) |
1da177e4 LT |
313 | { |
314 | netif_wake_queue(sl->dev); | |
315 | } | |
316 | ||
317 | /* Send one completely decapsulated IP datagram to the IP layer. */ | |
9ce6cf25 | 318 | static void sl_bump(struct slip *sl) |
1da177e4 LT |
319 | { |
320 | struct sk_buff *skb; | |
321 | int count; | |
322 | ||
323 | count = sl->rcount; | |
324 | #ifdef SL_INCLUDE_CSLIP | |
325 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
9ce6cf25 AC |
326 | unsigned char c = sl->rbuff[0]; |
327 | if (c & SL_TYPE_COMPRESSED_TCP) { | |
1da177e4 LT |
328 | /* ignore compressed packets when CSLIP is off */ |
329 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
330 | printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name); | |
331 | return; | |
332 | } | |
9ce6cf25 AC |
333 | /* make sure we've reserved enough space for uncompress |
334 | to use */ | |
1da177e4 LT |
335 | if (count + 80 > sl->buffsize) { |
336 | sl->rx_over_errors++; | |
337 | return; | |
338 | } | |
339 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
9ce6cf25 | 340 | if (count <= 0) |
1da177e4 | 341 | return; |
1da177e4 LT |
342 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { |
343 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
344 | /* turn on header compression */ | |
345 | sl->mode |= SL_MODE_CSLIP; | |
346 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
347 | printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name); | |
348 | } | |
349 | sl->rbuff[0] &= 0x4f; | |
9ce6cf25 | 350 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) |
1da177e4 | 351 | return; |
1da177e4 LT |
352 | } |
353 | } | |
354 | #endif /* SL_INCLUDE_CSLIP */ | |
355 | ||
9ce6cf25 | 356 | sl->rx_bytes += count; |
6aa20a22 | 357 | |
1da177e4 | 358 | skb = dev_alloc_skb(count); |
9ce6cf25 | 359 | if (skb == NULL) { |
1da177e4 LT |
360 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name); |
361 | sl->rx_dropped++; | |
362 | return; | |
363 | } | |
364 | skb->dev = sl->dev; | |
9ce6cf25 | 365 | memcpy(skb_put(skb, count), sl->rbuff, count); |
98e399f8 | 366 | skb_reset_mac_header(skb); |
9ce6cf25 | 367 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 368 | netif_rx(skb); |
1da177e4 LT |
369 | sl->rx_packets++; |
370 | } | |
371 | ||
372 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
9ce6cf25 | 373 | static void sl_encaps(struct slip *sl, unsigned char *icp, int len) |
1da177e4 LT |
374 | { |
375 | unsigned char *p; | |
376 | int actual, count; | |
377 | ||
378 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
379 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
380 | sl->tx_dropped++; | |
381 | sl_unlock(sl); | |
382 | return; | |
383 | } | |
384 | ||
385 | p = icp; | |
386 | #ifdef SL_INCLUDE_CSLIP | |
9ce6cf25 | 387 | if (sl->mode & SL_MODE_CSLIP) |
1da177e4 | 388 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); |
1da177e4 LT |
389 | #endif |
390 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 391 | if (sl->mode & SL_MODE_SLIP6) |
1da177e4 LT |
392 | count = slip_esc6(p, (unsigned char *) sl->xbuff, len); |
393 | else | |
394 | #endif | |
395 | count = slip_esc(p, (unsigned char *) sl->xbuff, len); | |
396 | ||
397 | /* Order of next two lines is *very* important. | |
398 | * When we are sending a little amount of data, | |
f34d7a5b | 399 | * the transfer may be completed inside the ops->write() |
1da177e4 LT |
400 | * routine, because it's running with interrupts enabled. |
401 | * In this case we *never* got WRITE_WAKEUP event, | |
402 | * if we did not request it before write operation. | |
403 | * 14 Oct 1994 Dmitry Gorodchanin. | |
404 | */ | |
8a1ec21e | 405 | set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
f34d7a5b | 406 | actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
1da177e4 LT |
407 | #ifdef SL_CHECK_TRANSMIT |
408 | sl->dev->trans_start = jiffies; | |
409 | #endif | |
410 | sl->xleft = count - actual; | |
411 | sl->xhead = sl->xbuff + actual; | |
412 | #ifdef CONFIG_SLIP_SMART | |
413 | /* VSV */ | |
414 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
415 | #endif | |
416 | } | |
417 | ||
418 | /* | |
419 | * Called by the driver when there's room for more data. If we have | |
420 | * more packets to send, we send them here. | |
421 | */ | |
422 | static void slip_write_wakeup(struct tty_struct *tty) | |
423 | { | |
424 | int actual; | |
9ce6cf25 | 425 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
426 | |
427 | /* First make sure we're connected. */ | |
9ce6cf25 | 428 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 | 429 | return; |
9ce6cf25 | 430 | |
1da177e4 LT |
431 | if (sl->xleft <= 0) { |
432 | /* Now serial buffer is almost free & we can start | |
433 | * transmission of another packet */ | |
434 | sl->tx_packets++; | |
8a1ec21e | 435 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
1da177e4 LT |
436 | sl_unlock(sl); |
437 | return; | |
438 | } | |
439 | ||
f34d7a5b | 440 | actual = tty->ops->write(tty, sl->xhead, sl->xleft); |
1da177e4 LT |
441 | sl->xleft -= actual; |
442 | sl->xhead += actual; | |
443 | } | |
444 | ||
445 | static void sl_tx_timeout(struct net_device *dev) | |
446 | { | |
447 | struct slip *sl = netdev_priv(dev); | |
448 | ||
449 | spin_lock(&sl->lock); | |
450 | ||
451 | if (netif_queue_stopped(dev)) { | |
452 | if (!netif_running(dev)) | |
453 | goto out; | |
454 | ||
455 | /* May be we must check transmitter timeout here ? | |
456 | * 14 Oct 1994 Dmitry Gorodchanin. | |
457 | */ | |
458 | #ifdef SL_CHECK_TRANSMIT | |
459 | if (time_before(jiffies, dev->trans_start + 20 * HZ)) { | |
460 | /* 20 sec timeout not reached */ | |
461 | goto out; | |
462 | } | |
9ce6cf25 AC |
463 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", |
464 | dev->name, | |
f34d7a5b | 465 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
9ce6cf25 | 466 | "bad line quality" : "driver error"); |
1da177e4 | 467 | sl->xleft = 0; |
8a1ec21e | 468 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
469 | sl_unlock(sl); |
470 | #endif | |
471 | } | |
1da177e4 LT |
472 | out: |
473 | spin_unlock(&sl->lock); | |
474 | } | |
475 | ||
476 | ||
477 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
424efe9c | 478 | static netdev_tx_t |
1da177e4 LT |
479 | sl_xmit(struct sk_buff *skb, struct net_device *dev) |
480 | { | |
481 | struct slip *sl = netdev_priv(dev); | |
482 | ||
483 | spin_lock(&sl->lock); | |
9ce6cf25 | 484 | if (!netif_running(dev)) { |
1da177e4 LT |
485 | spin_unlock(&sl->lock); |
486 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
487 | dev_kfree_skb(skb); | |
6ed10654 | 488 | return NETDEV_TX_OK; |
1da177e4 LT |
489 | } |
490 | if (sl->tty == NULL) { | |
491 | spin_unlock(&sl->lock); | |
492 | dev_kfree_skb(skb); | |
6ed10654 | 493 | return NETDEV_TX_OK; |
1da177e4 LT |
494 | } |
495 | ||
496 | sl_lock(sl); | |
9ce6cf25 | 497 | sl->tx_bytes += skb->len; |
1da177e4 LT |
498 | sl_encaps(sl, skb->data, skb->len); |
499 | spin_unlock(&sl->lock); | |
500 | ||
501 | dev_kfree_skb(skb); | |
6ed10654 | 502 | return NETDEV_TX_OK; |
1da177e4 LT |
503 | } |
504 | ||
505 | ||
506 | /****************************************** | |
507 | * Routines looking at netdevice side. | |
508 | ******************************************/ | |
509 | ||
510 | /* Netdevice UP -> DOWN routine */ | |
511 | ||
512 | static int | |
513 | sl_close(struct net_device *dev) | |
514 | { | |
515 | struct slip *sl = netdev_priv(dev); | |
516 | ||
517 | spin_lock_bh(&sl->lock); | |
8a1ec21e | 518 | if (sl->tty) |
1da177e4 | 519 | /* TTY discipline is running. */ |
8a1ec21e | 520 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
1da177e4 LT |
521 | netif_stop_queue(dev); |
522 | sl->rcount = 0; | |
523 | sl->xleft = 0; | |
524 | spin_unlock_bh(&sl->lock); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | /* Netdevice DOWN -> UP routine */ | |
530 | ||
531 | static int sl_open(struct net_device *dev) | |
532 | { | |
533 | struct slip *sl = netdev_priv(dev); | |
534 | ||
9ce6cf25 | 535 | if (sl->tty == NULL) |
1da177e4 LT |
536 | return -ENODEV; |
537 | ||
538 | sl->flags &= (1 << SLF_INUSE); | |
539 | netif_start_queue(dev); | |
540 | return 0; | |
541 | } | |
542 | ||
543 | /* Netdevice change MTU request */ | |
544 | ||
545 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
546 | { | |
547 | struct slip *sl = netdev_priv(dev); | |
548 | ||
549 | if (new_mtu < 68 || new_mtu > 65534) | |
550 | return -EINVAL; | |
551 | ||
552 | if (new_mtu != dev->mtu) | |
553 | return sl_realloc_bufs(sl, new_mtu); | |
554 | return 0; | |
555 | } | |
556 | ||
557 | /* Netdevice get statistics request */ | |
558 | ||
559 | static struct net_device_stats * | |
560 | sl_get_stats(struct net_device *dev) | |
561 | { | |
562 | static struct net_device_stats stats; | |
563 | struct slip *sl = netdev_priv(dev); | |
564 | #ifdef SL_INCLUDE_CSLIP | |
565 | struct slcompress *comp; | |
566 | #endif | |
567 | ||
568 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
569 | ||
570 | stats.rx_packets = sl->rx_packets; | |
571 | stats.tx_packets = sl->tx_packets; | |
572 | stats.rx_bytes = sl->rx_bytes; | |
573 | stats.tx_bytes = sl->tx_bytes; | |
574 | stats.rx_dropped = sl->rx_dropped; | |
575 | stats.tx_dropped = sl->tx_dropped; | |
576 | stats.tx_errors = sl->tx_errors; | |
577 | stats.rx_errors = sl->rx_errors; | |
578 | stats.rx_over_errors = sl->rx_over_errors; | |
579 | #ifdef SL_INCLUDE_CSLIP | |
580 | stats.rx_fifo_errors = sl->rx_compressed; | |
581 | stats.tx_fifo_errors = sl->tx_compressed; | |
582 | stats.collisions = sl->tx_misses; | |
583 | comp = sl->slcomp; | |
584 | if (comp) { | |
585 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
586 | stats.rx_dropped += comp->sls_i_tossed; | |
587 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
588 | stats.collisions += comp->sls_o_misses; | |
589 | } | |
590 | #endif /* CONFIG_INET */ | |
591 | return (&stats); | |
592 | } | |
593 | ||
594 | /* Netdevice register callback */ | |
595 | ||
596 | static int sl_init(struct net_device *dev) | |
597 | { | |
598 | struct slip *sl = netdev_priv(dev); | |
599 | ||
600 | /* | |
6aa20a22 | 601 | * Finish setting up the DEVICE info. |
1da177e4 LT |
602 | */ |
603 | ||
604 | dev->mtu = sl->mtu; | |
605 | dev->type = ARPHRD_SLIP + sl->mode; | |
606 | #ifdef SL_CHECK_TRANSMIT | |
1da177e4 LT |
607 | dev->watchdog_timeo = 20*HZ; |
608 | #endif | |
609 | return 0; | |
610 | } | |
611 | ||
612 | ||
613 | static void sl_uninit(struct net_device *dev) | |
614 | { | |
615 | struct slip *sl = netdev_priv(dev); | |
616 | ||
617 | sl_free_bufs(sl); | |
618 | } | |
619 | ||
5342b77c AC |
620 | /* Hook the destructor so we can free slip devices at the right point in time */ |
621 | static void sl_free_netdev(struct net_device *dev) | |
622 | { | |
623 | int i = dev->base_addr; | |
624 | free_netdev(dev); | |
625 | slip_devs[i] = NULL; | |
626 | } | |
627 | ||
b1da683d SH |
628 | static const struct net_device_ops sl_netdev_ops = { |
629 | .ndo_init = sl_init, | |
630 | .ndo_uninit = sl_uninit, | |
631 | .ndo_open = sl_open, | |
632 | .ndo_stop = sl_close, | |
633 | .ndo_start_xmit = sl_xmit, | |
634 | .ndo_get_stats = sl_get_stats, | |
635 | .ndo_change_mtu = sl_change_mtu, | |
636 | .ndo_tx_timeout = sl_tx_timeout, | |
637 | #ifdef CONFIG_SLIP_SMART | |
638 | .ndo_do_ioctl = sl_ioctl, | |
639 | #endif | |
640 | }; | |
641 | ||
642 | ||
1da177e4 LT |
643 | static void sl_setup(struct net_device *dev) |
644 | { | |
b1da683d | 645 | dev->netdev_ops = &sl_netdev_ops; |
5342b77c | 646 | dev->destructor = sl_free_netdev; |
b1da683d | 647 | |
1da177e4 LT |
648 | dev->hard_header_len = 0; |
649 | dev->addr_len = 0; | |
650 | dev->tx_queue_len = 10; | |
651 | ||
1da177e4 LT |
652 | /* New-style flags. */ |
653 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
654 | } | |
655 | ||
656 | /****************************************** | |
657 | Routines looking at TTY side. | |
658 | ******************************************/ | |
659 | ||
660 | ||
1da177e4 LT |
661 | /* |
662 | * Handle the 'receiver data ready' interrupt. | |
663 | * This function is called by the 'tty_io' module in the kernel when | |
664 | * a block of SLIP data has been received, which can now be decapsulated | |
665 | * and sent on to some IP layer for further processing. This will not | |
666 | * be re-entered while running but other ldisc functions may be called | |
667 | * in parallel | |
668 | */ | |
6aa20a22 | 669 | |
9ce6cf25 AC |
670 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
671 | char *fp, int count) | |
1da177e4 | 672 | { |
9ce6cf25 | 673 | struct slip *sl = tty->disc_data; |
1da177e4 | 674 | |
9ce6cf25 | 675 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 LT |
676 | return; |
677 | ||
678 | /* Read the characters out of the buffer */ | |
679 | while (count--) { | |
680 | if (fp && *fp++) { | |
9ce6cf25 | 681 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
1da177e4 | 682 | sl->rx_errors++; |
1da177e4 LT |
683 | cp++; |
684 | continue; | |
685 | } | |
686 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
687 | if (sl->mode & SL_MODE_SLIP6) | |
688 | slip_unesc6(sl, *cp++); | |
689 | else | |
690 | #endif | |
691 | slip_unesc(sl, *cp++); | |
692 | } | |
693 | } | |
694 | ||
695 | /************************************ | |
696 | * slip_open helper routines. | |
697 | ************************************/ | |
698 | ||
699 | /* Collect hanged up channels */ | |
1da177e4 LT |
700 | static void sl_sync(void) |
701 | { | |
702 | int i; | |
703 | struct net_device *dev; | |
704 | struct slip *sl; | |
705 | ||
706 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
707 | dev = slip_devs[i]; |
708 | if (dev == NULL) | |
1da177e4 LT |
709 | break; |
710 | ||
711 | sl = netdev_priv(dev); | |
712 | if (sl->tty || sl->leased) | |
713 | continue; | |
9ce6cf25 | 714 | if (dev->flags & IFF_UP) |
1da177e4 LT |
715 | dev_close(dev); |
716 | } | |
717 | } | |
718 | ||
719 | ||
720 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
9ce6cf25 | 721 | static struct slip *sl_alloc(dev_t line) |
1da177e4 LT |
722 | { |
723 | int i; | |
1da177e4 LT |
724 | struct net_device *dev = NULL; |
725 | struct slip *sl; | |
726 | ||
6aa20a22 | 727 | if (slip_devs == NULL) |
1da177e4 LT |
728 | return NULL; /* Master array missing ! */ |
729 | ||
730 | for (i = 0; i < slip_maxdev; i++) { | |
731 | dev = slip_devs[i]; | |
732 | if (dev == NULL) | |
733 | break; | |
1da177e4 | 734 | } |
1da177e4 LT |
735 | /* Sorry, too many, all slots in use */ |
736 | if (i >= slip_maxdev) | |
737 | return NULL; | |
738 | ||
739 | if (dev) { | |
740 | sl = netdev_priv(dev); | |
741 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
742 | unregister_netdevice(dev); | |
743 | dev = NULL; | |
744 | slip_devs[i] = NULL; | |
745 | } | |
746 | } | |
6aa20a22 | 747 | |
1da177e4 LT |
748 | if (!dev) { |
749 | char name[IFNAMSIZ]; | |
750 | sprintf(name, "sl%d", i); | |
751 | ||
752 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
753 | if (!dev) | |
754 | return NULL; | |
755 | dev->base_addr = i; | |
756 | } | |
757 | ||
758 | sl = netdev_priv(dev); | |
759 | ||
760 | /* Initialize channel control data */ | |
761 | sl->magic = SLIP_MAGIC; | |
762 | sl->dev = dev; | |
763 | spin_lock_init(&sl->lock); | |
764 | sl->mode = SL_MODE_DEFAULT; | |
765 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
766 | /* initialize timer_list struct */ |
767 | init_timer(&sl->keepalive_timer); | |
768 | sl->keepalive_timer.data = (unsigned long)sl; | |
769 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 770 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
771 | sl->outfill_timer.data = (unsigned long)sl; |
772 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
773 | #endif |
774 | slip_devs[i] = dev; | |
1da177e4 LT |
775 | return sl; |
776 | } | |
777 | ||
778 | /* | |
779 | * Open the high-level part of the SLIP channel. | |
780 | * This function is called by the TTY module when the | |
781 | * SLIP line discipline is called for. Because we are | |
782 | * sure the tty line exists, we only have to link it to | |
783 | * a free SLIP channel... | |
784 | * | |
785 | * Called in process context serialized from other ldisc calls. | |
786 | */ | |
787 | ||
788 | static int slip_open(struct tty_struct *tty) | |
789 | { | |
790 | struct slip *sl; | |
791 | int err; | |
792 | ||
9ce6cf25 | 793 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 794 | return -EPERM; |
6aa20a22 | 795 | |
f34d7a5b AC |
796 | if (tty->ops->write == NULL) |
797 | return -EOPNOTSUPP; | |
798 | ||
1da177e4 LT |
799 | /* RTnetlink lock is misused here to serialize concurrent |
800 | opens of slip channels. There are better ways, but it is | |
801 | the simplest one. | |
802 | */ | |
803 | rtnl_lock(); | |
804 | ||
805 | /* Collect hanged up channels. */ | |
806 | sl_sync(); | |
807 | ||
9ce6cf25 | 808 | sl = tty->disc_data; |
1da177e4 LT |
809 | |
810 | err = -EEXIST; | |
811 | /* First make sure we're not already connected. */ | |
812 | if (sl && sl->magic == SLIP_MAGIC) | |
813 | goto err_exit; | |
814 | ||
815 | /* OK. Find a free SLIP channel to use. */ | |
816 | err = -ENFILE; | |
9ce6cf25 AC |
817 | sl = sl_alloc(tty_devnum(tty)); |
818 | if (sl == NULL) | |
1da177e4 LT |
819 | goto err_exit; |
820 | ||
821 | sl->tty = tty; | |
822 | tty->disc_data = sl; | |
823 | sl->line = tty_devnum(tty); | |
824 | sl->pid = current->pid; | |
6aa20a22 | 825 | |
1da177e4 LT |
826 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
827 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
828 | err = sl_alloc_bufs(sl, SL_MTU); |
829 | if (err) | |
1da177e4 LT |
830 | goto err_free_chan; |
831 | ||
832 | set_bit(SLF_INUSE, &sl->flags); | |
833 | ||
9ce6cf25 AC |
834 | err = register_netdevice(sl->dev); |
835 | if (err) | |
1da177e4 LT |
836 | goto err_free_bufs; |
837 | } | |
838 | ||
839 | #ifdef CONFIG_SLIP_SMART | |
840 | if (sl->keepalive) { | |
9ce6cf25 AC |
841 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
842 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
843 | } |
844 | if (sl->outfill) { | |
9ce6cf25 AC |
845 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
846 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
847 | } |
848 | #endif | |
849 | ||
850 | /* Done. We have linked the TTY line to a channel. */ | |
851 | rtnl_unlock(); | |
33f0f88f | 852 | tty->receive_room = 65536; /* We don't flow control */ |
1da177e4 LT |
853 | return sl->dev->base_addr; |
854 | ||
855 | err_free_bufs: | |
856 | sl_free_bufs(sl); | |
857 | ||
858 | err_free_chan: | |
859 | sl->tty = NULL; | |
860 | tty->disc_data = NULL; | |
861 | clear_bit(SLF_INUSE, &sl->flags); | |
862 | ||
863 | err_exit: | |
864 | rtnl_unlock(); | |
865 | ||
866 | /* Count references from TTY module */ | |
867 | return err; | |
868 | } | |
869 | ||
1da177e4 LT |
870 | /* |
871 | * Close down a SLIP channel. | |
872 | * This means flushing out any pending queues, and then returning. This | |
873 | * call is serialized against other ldisc functions. | |
5342b77c AC |
874 | * |
875 | * We also use this method fo a hangup event | |
1da177e4 | 876 | */ |
5342b77c | 877 | |
9ce6cf25 | 878 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 879 | { |
9ce6cf25 | 880 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
881 | |
882 | /* First make sure we're connected. */ | |
883 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
884 | return; | |
885 | ||
886 | tty->disc_data = NULL; | |
887 | sl->tty = NULL; | |
888 | if (!sl->leased) | |
889 | sl->line = 0; | |
890 | ||
891 | /* VSV = very important to remove timers */ | |
892 | #ifdef CONFIG_SLIP_SMART | |
893 | del_timer_sync(&sl->keepalive_timer); | |
894 | del_timer_sync(&sl->outfill_timer); | |
895 | #endif | |
5342b77c AC |
896 | /* Flush network side */ |
897 | unregister_netdev(sl->dev); | |
898 | /* This will complete via sl_free_netdev */ | |
1da177e4 LT |
899 | } |
900 | ||
5342b77c AC |
901 | static int slip_hangup(struct tty_struct *tty) |
902 | { | |
903 | slip_close(tty); | |
904 | return 0; | |
905 | } | |
1da177e4 LT |
906 | /************************************************************************ |
907 | * STANDARD SLIP ENCAPSULATION * | |
908 | ************************************************************************/ | |
909 | ||
9ce6cf25 | 910 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
911 | { |
912 | unsigned char *ptr = d; | |
913 | unsigned char c; | |
914 | ||
915 | /* | |
916 | * Send an initial END character to flush out any | |
917 | * data that may have accumulated in the receiver | |
918 | * due to line noise. | |
919 | */ | |
920 | ||
921 | *ptr++ = END; | |
922 | ||
923 | /* | |
924 | * For each byte in the packet, send the appropriate | |
925 | * character sequence, according to the SLIP protocol. | |
926 | */ | |
927 | ||
928 | while (len-- > 0) { | |
9ce6cf25 AC |
929 | switch (c = *s++) { |
930 | case END: | |
1da177e4 LT |
931 | *ptr++ = ESC; |
932 | *ptr++ = ESC_END; | |
933 | break; | |
9ce6cf25 | 934 | case ESC: |
1da177e4 LT |
935 | *ptr++ = ESC; |
936 | *ptr++ = ESC_ESC; | |
937 | break; | |
9ce6cf25 | 938 | default: |
1da177e4 LT |
939 | *ptr++ = c; |
940 | break; | |
941 | } | |
942 | } | |
943 | *ptr++ = END; | |
944 | return (ptr - d); | |
945 | } | |
946 | ||
947 | static void slip_unesc(struct slip *sl, unsigned char s) | |
948 | { | |
949 | ||
9ce6cf25 AC |
950 | switch (s) { |
951 | case END: | |
1da177e4 LT |
952 | #ifdef CONFIG_SLIP_SMART |
953 | /* drop keeptest bit = VSV */ | |
954 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
955 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
956 | #endif | |
957 | ||
9ce6cf25 AC |
958 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) |
959 | && (sl->rcount > 2)) | |
1da177e4 | 960 | sl_bump(sl); |
1da177e4 LT |
961 | clear_bit(SLF_ESCAPE, &sl->flags); |
962 | sl->rcount = 0; | |
963 | return; | |
964 | ||
9ce6cf25 | 965 | case ESC: |
1da177e4 LT |
966 | set_bit(SLF_ESCAPE, &sl->flags); |
967 | return; | |
9ce6cf25 AC |
968 | case ESC_ESC: |
969 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 970 | s = ESC; |
1da177e4 | 971 | break; |
9ce6cf25 AC |
972 | case ESC_END: |
973 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 974 | s = END; |
1da177e4 LT |
975 | break; |
976 | } | |
977 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
978 | if (sl->rcount < sl->buffsize) { | |
979 | sl->rbuff[sl->rcount++] = s; | |
980 | return; | |
981 | } | |
982 | sl->rx_over_errors++; | |
983 | set_bit(SLF_ERROR, &sl->flags); | |
984 | } | |
985 | } | |
986 | ||
987 | ||
988 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
989 | /************************************************************************ | |
990 | * 6 BIT SLIP ENCAPSULATION * | |
991 | ************************************************************************/ | |
992 | ||
9ce6cf25 | 993 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
994 | { |
995 | unsigned char *ptr = d; | |
996 | unsigned char c; | |
997 | int i; | |
998 | unsigned short v = 0; | |
999 | short bits = 0; | |
1000 | ||
1001 | /* | |
1002 | * Send an initial END character to flush out any | |
1003 | * data that may have accumulated in the receiver | |
1004 | * due to line noise. | |
1005 | */ | |
1006 | ||
1007 | *ptr++ = 0x70; | |
1008 | ||
1009 | /* | |
1010 | * Encode the packet into printable ascii characters | |
1011 | */ | |
1012 | ||
1013 | for (i = 0; i < len; ++i) { | |
1014 | v = (v << 8) | s[i]; | |
1015 | bits += 8; | |
1016 | while (bits >= 6) { | |
1017 | bits -= 6; | |
1018 | c = 0x30 + ((v >> bits) & 0x3F); | |
1019 | *ptr++ = c; | |
1020 | } | |
1021 | } | |
1022 | if (bits) { | |
1023 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1024 | *ptr++ = c; | |
1025 | } | |
1026 | *ptr++ = 0x70; | |
1027 | return ptr - d; | |
1028 | } | |
1029 | ||
9ce6cf25 | 1030 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1031 | { |
1032 | unsigned char c; | |
1033 | ||
1034 | if (s == 0x70) { | |
1035 | #ifdef CONFIG_SLIP_SMART | |
1036 | /* drop keeptest bit = VSV */ | |
1037 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1038 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1039 | #endif | |
1040 | ||
9ce6cf25 AC |
1041 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) |
1042 | && (sl->rcount > 2)) | |
1da177e4 | 1043 | sl_bump(sl); |
1da177e4 LT |
1044 | sl->rcount = 0; |
1045 | sl->xbits = 0; | |
1046 | sl->xdata = 0; | |
9ce6cf25 | 1047 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1048 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1049 | sl->xbits += 6; | |
1050 | if (sl->xbits >= 8) { | |
1051 | sl->xbits -= 8; | |
1052 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1053 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1054 | if (sl->rcount < sl->buffsize) { | |
1055 | sl->rbuff[sl->rcount++] = c; | |
1056 | return; | |
1057 | } | |
1058 | sl->rx_over_errors++; | |
1059 | set_bit(SLF_ERROR, &sl->flags); | |
1060 | } | |
1061 | } | |
9ce6cf25 | 1062 | } |
1da177e4 LT |
1063 | } |
1064 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1065 | ||
1066 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1067 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1068 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1069 | { |
9ce6cf25 | 1070 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1071 | unsigned int tmp; |
1072 | int __user *p = (int __user *)arg; | |
1073 | ||
1074 | /* First make sure we're connected. */ | |
9ce6cf25 | 1075 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1076 | return -EINVAL; |
1da177e4 | 1077 | |
9ce6cf25 AC |
1078 | switch (cmd) { |
1079 | case SIOCGIFNAME: | |
1da177e4 LT |
1080 | tmp = strlen(sl->dev->name) + 1; |
1081 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1082 | return -EFAULT; | |
1083 | return 0; | |
1084 | ||
1085 | case SIOCGIFENCAP: | |
1086 | if (put_user(sl->mode, p)) | |
1087 | return -EFAULT; | |
1088 | return 0; | |
1089 | ||
1090 | case SIOCSIFENCAP: | |
1091 | if (get_user(tmp, p)) | |
1092 | return -EFAULT; | |
1093 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1094 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1095 | return -EINVAL; |
1da177e4 LT |
1096 | #else |
1097 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1098 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1099 | /* return -EINVAL; */ |
1100 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1101 | #endif |
1102 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1103 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1104 | return -EINVAL; |
1da177e4 LT |
1105 | #endif |
1106 | sl->mode = tmp; | |
9ce6cf25 | 1107 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1108 | return 0; |
1109 | ||
9ce6cf25 | 1110 | case SIOCSIFHWADDR: |
1da177e4 LT |
1111 | return -EINVAL; |
1112 | ||
1113 | #ifdef CONFIG_SLIP_SMART | |
1114 | /* VSV changes start here */ | |
9ce6cf25 | 1115 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1116 | if (get_user(tmp, p)) |
1117 | return -EFAULT; | |
9ce6cf25 | 1118 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1119 | return -EINVAL; |
1120 | ||
1121 | spin_lock_bh(&sl->lock); | |
1122 | if (!sl->tty) { | |
1123 | spin_unlock_bh(&sl->lock); | |
1124 | return -ENODEV; | |
1125 | } | |
9ce6cf25 AC |
1126 | sl->keepalive = (u8)tmp; |
1127 | if (sl->keepalive != 0) { | |
1128 | mod_timer(&sl->keepalive_timer, | |
1129 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1130 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1131 | } else |
1132 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1133 | spin_unlock_bh(&sl->lock); |
1134 | return 0; | |
1135 | ||
9ce6cf25 | 1136 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1137 | if (put_user(sl->keepalive, p)) |
1138 | return -EFAULT; | |
1139 | return 0; | |
1140 | ||
9ce6cf25 | 1141 | case SIOCSOUTFILL: |
1da177e4 LT |
1142 | if (get_user(tmp, p)) |
1143 | return -EFAULT; | |
9ce6cf25 | 1144 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1145 | return -EINVAL; |
1146 | spin_lock_bh(&sl->lock); | |
1147 | if (!sl->tty) { | |
1148 | spin_unlock_bh(&sl->lock); | |
1149 | return -ENODEV; | |
1150 | } | |
9ce6cf25 AC |
1151 | sl->outfill = (u8)tmp; |
1152 | if (sl->outfill != 0) { | |
1153 | mod_timer(&sl->outfill_timer, | |
1154 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1155 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1156 | } else |
1157 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1158 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1159 | return 0; |
1da177e4 | 1160 | |
9ce6cf25 | 1161 | case SIOCGOUTFILL: |
1da177e4 LT |
1162 | if (put_user(sl->outfill, p)) |
1163 | return -EFAULT; | |
1164 | return 0; | |
1165 | /* VSV changes end */ | |
1166 | #endif | |
1da177e4 | 1167 | default: |
d0127539 | 1168 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1169 | } |
1170 | } | |
1171 | ||
1172 | /* VSV changes start here */ | |
1173 | #ifdef CONFIG_SLIP_SMART | |
1174 | /* function do_ioctl called from net/core/dev.c | |
1175 | to allow get/set outfill/keepalive parameter | |
1176 | by ifconfig */ | |
1177 | ||
9ce6cf25 | 1178 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1179 | { |
1180 | struct slip *sl = netdev_priv(dev); | |
1181 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1182 | ||
1183 | if (sl == NULL) /* Allocation failed ?? */ | |
1184 | return -ENODEV; | |
1185 | ||
1186 | spin_lock_bh(&sl->lock); | |
1187 | ||
1188 | if (!sl->tty) { | |
1189 | spin_unlock_bh(&sl->lock); | |
1190 | return -ENODEV; | |
1191 | } | |
1192 | ||
9ce6cf25 AC |
1193 | switch (cmd) { |
1194 | case SIOCSKEEPALIVE: | |
1da177e4 | 1195 | /* max for unchar */ |
9ce6cf25 | 1196 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1197 | spin_unlock_bh(&sl->lock); |
1198 | return -EINVAL; | |
1199 | } | |
9ce6cf25 | 1200 | sl->keepalive = (u8)*p; |
1da177e4 | 1201 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1202 | sl->keepalive_timer.expires = |
1203 | jiffies + sl->keepalive * HZ; | |
1204 | mod_timer(&sl->keepalive_timer, | |
1205 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1206 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1207 | } else |
1208 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1209 | break; |
1210 | ||
9ce6cf25 | 1211 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1212 | *p = sl->keepalive; |
1213 | break; | |
1214 | ||
9ce6cf25 AC |
1215 | case SIOCSOUTFILL: |
1216 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1217 | spin_unlock_bh(&sl->lock); |
1218 | return -EINVAL; | |
1219 | } | |
9ce6cf25 AC |
1220 | sl->outfill = (u8)*p; |
1221 | if (sl->outfill != 0) { | |
1222 | mod_timer(&sl->outfill_timer, | |
1223 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1224 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1225 | } else |
1226 | del_timer(&sl->outfill_timer); | |
1227 | break; | |
1da177e4 | 1228 | |
9ce6cf25 | 1229 | case SIOCGOUTFILL: |
1da177e4 LT |
1230 | *p = sl->outfill; |
1231 | break; | |
1232 | ||
9ce6cf25 | 1233 | case SIOCSLEASE: |
6aa20a22 | 1234 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1235 | and opened by another process device. |
1236 | */ | |
9ce6cf25 AC |
1237 | if (sl->tty != current->signal->tty && |
1238 | sl->pid != current->pid) { | |
1da177e4 LT |
1239 | spin_unlock_bh(&sl->lock); |
1240 | return -EPERM; | |
1241 | } | |
1242 | sl->leased = 0; | |
9ce6cf25 | 1243 | if (*p) |
1da177e4 | 1244 | sl->leased = 1; |
9ce6cf25 | 1245 | break; |
1da177e4 | 1246 | |
9ce6cf25 | 1247 | case SIOCGLEASE: |
1da177e4 LT |
1248 | *p = sl->leased; |
1249 | }; | |
1250 | spin_unlock_bh(&sl->lock); | |
1251 | return 0; | |
1252 | } | |
1253 | #endif | |
1254 | /* VSV changes end */ | |
1255 | ||
a352def2 | 1256 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 LT |
1257 | .owner = THIS_MODULE, |
1258 | .magic = TTY_LDISC_MAGIC, | |
1259 | .name = "slip", | |
1260 | .open = slip_open, | |
1261 | .close = slip_close, | |
5342b77c | 1262 | .hangup = slip_hangup, |
1da177e4 LT |
1263 | .ioctl = slip_ioctl, |
1264 | .receive_buf = slip_receive_buf, | |
1da177e4 LT |
1265 | .write_wakeup = slip_write_wakeup, |
1266 | }; | |
1267 | ||
1268 | static int __init slip_init(void) | |
1269 | { | |
1270 | int status; | |
1271 | ||
1272 | if (slip_maxdev < 4) | |
1273 | slip_maxdev = 4; /* Sanity */ | |
1274 | ||
1275 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1276 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1277 | " (6 bit encapsulation enabled)" | |
1278 | #endif | |
1279 | ".\n", | |
9ce6cf25 | 1280 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1281 | #if defined(SL_INCLUDE_CSLIP) |
1282 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1283 | #endif | |
1284 | #ifdef CONFIG_SLIP_SMART | |
1285 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1286 | #endif | |
1287 | ||
9ce6cf25 AC |
1288 | slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev, |
1289 | GFP_KERNEL); | |
1da177e4 | 1290 | if (!slip_devs) { |
9ce6cf25 | 1291 | printk(KERN_ERR "SLIP: Can't allocate slip devices array.\n"); |
1da177e4 LT |
1292 | return -ENOMEM; |
1293 | } | |
1294 | ||
1da177e4 | 1295 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1296 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1297 | if (status != 0) { | |
1da177e4 LT |
1298 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1299 | kfree(slip_devs); | |
1300 | } | |
1301 | return status; | |
1302 | } | |
1303 | ||
1304 | static void __exit slip_exit(void) | |
1305 | { | |
1306 | int i; | |
1307 | struct net_device *dev; | |
1308 | struct slip *sl; | |
1309 | unsigned long timeout = jiffies + HZ; | |
1310 | int busy = 0; | |
1311 | ||
6aa20a22 | 1312 | if (slip_devs == NULL) |
1da177e4 LT |
1313 | return; |
1314 | ||
1315 | /* First of all: check for active disciplines and hangup them. | |
1316 | */ | |
1317 | do { | |
a9fc2510 NA |
1318 | if (busy) |
1319 | msleep_interruptible(100); | |
1da177e4 LT |
1320 | |
1321 | busy = 0; | |
1322 | for (i = 0; i < slip_maxdev; i++) { | |
1323 | dev = slip_devs[i]; | |
1324 | if (!dev) | |
1325 | continue; | |
1326 | sl = netdev_priv(dev); | |
1327 | spin_lock_bh(&sl->lock); | |
1328 | if (sl->tty) { | |
1329 | busy++; | |
1330 | tty_hangup(sl->tty); | |
1331 | } | |
1332 | spin_unlock_bh(&sl->lock); | |
1333 | } | |
1334 | } while (busy && time_before(jiffies, timeout)); | |
1335 | ||
5342b77c AC |
1336 | /* FIXME: hangup is async so we should wait when doing this second |
1337 | phase */ | |
1da177e4 LT |
1338 | |
1339 | for (i = 0; i < slip_maxdev; i++) { | |
1340 | dev = slip_devs[i]; | |
1341 | if (!dev) | |
1342 | continue; | |
1343 | slip_devs[i] = NULL; | |
1344 | ||
1345 | sl = netdev_priv(dev); | |
1346 | if (sl->tty) { | |
1347 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1348 | dev->name); | |
1349 | /* Intentionally leak the control block. */ | |
1350 | dev->destructor = NULL; | |
6aa20a22 | 1351 | } |
1da177e4 LT |
1352 | |
1353 | unregister_netdev(dev); | |
1354 | } | |
1355 | ||
1356 | kfree(slip_devs); | |
1357 | slip_devs = NULL; | |
1358 | ||
9ce6cf25 AC |
1359 | i = tty_unregister_ldisc(N_SLIP); |
1360 | if (i != 0) | |
1da177e4 | 1361 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | module_init(slip_init); | |
1365 | module_exit(slip_exit); | |
1366 | ||
1367 | #ifdef CONFIG_SLIP_SMART | |
1368 | /* | |
1369 | * This is start of the code for multislip style line checking | |
1370 | * added by Stanislav Voronyi. All changes before marked VSV | |
1371 | */ | |
1372 | ||
1373 | static void sl_outfill(unsigned long sls) | |
1374 | { | |
9ce6cf25 | 1375 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1376 | |
1377 | spin_lock(&sl->lock); | |
1378 | ||
1379 | if (sl->tty == NULL) | |
1380 | goto out; | |
1381 | ||
9ce6cf25 AC |
1382 | if (sl->outfill) { |
1383 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1384 | /* no packets were transmitted, do outfill */ |
1385 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1386 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1387 | #else | |
1388 | unsigned char s = END; | |
1389 | #endif | |
1390 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1391 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1392 | /* if device busy no outfill */ |
f34d7a5b | 1393 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1394 | } |
9ce6cf25 | 1395 | } else |
1da177e4 LT |
1396 | set_bit(SLF_OUTWAIT, &sl->flags); |
1397 | ||
1398 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1399 | } | |
1400 | out: | |
1401 | spin_unlock(&sl->lock); | |
1402 | } | |
1403 | ||
1404 | static void sl_keepalive(unsigned long sls) | |
1405 | { | |
9ce6cf25 | 1406 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1407 | |
1408 | spin_lock(&sl->lock); | |
1409 | ||
1410 | if (sl->tty == NULL) | |
1411 | goto out; | |
1412 | ||
9ce6cf25 AC |
1413 | if (sl->keepalive) { |
1414 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1415 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1416 | if (sl->outfill) |
1417 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1418 | (void)del_timer(&sl->outfill_timer); |
1419 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1420 | /* this must hangup tty & close slip */ |
1421 | tty_hangup(sl->tty); | |
1da177e4 LT |
1422 | /* I think we need not something else */ |
1423 | goto out; | |
9ce6cf25 | 1424 | } else |
1da177e4 LT |
1425 | set_bit(SLF_KEEPTEST, &sl->flags); |
1426 | ||
1427 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1428 | } | |
1da177e4 LT |
1429 | out: |
1430 | spin_unlock(&sl->lock); | |
1431 | } | |
1432 | ||
1433 | #endif | |
1434 | MODULE_LICENSE("GPL"); | |
1435 | MODULE_ALIAS_LDISC(N_SLIP); |