Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
67 | #include <asm/uaccess.h> |
68 | #include <linux/bitops.h> | |
d43c36dc | 69 | #include <linux/sched.h> |
1da177e4 LT |
70 | #include <linux/string.h> |
71 | #include <linux/mm.h> | |
72 | #include <linux/interrupt.h> | |
73 | #include <linux/in.h> | |
74 | #include <linux/tty.h> | |
75 | #include <linux/errno.h> | |
76 | #include <linux/netdevice.h> | |
77 | #include <linux/etherdevice.h> | |
78 | #include <linux/skbuff.h> | |
79 | #include <linux/rtnetlink.h> | |
80 | #include <linux/if_arp.h> | |
81 | #include <linux/if_slip.h> | |
9646e7ce | 82 | #include <linux/compat.h> |
12dc2fdd | 83 | #include <linux/delay.h> |
1da177e4 | 84 | #include <linux/init.h> |
5a0e3ad6 | 85 | #include <linux/slab.h> |
1da177e4 LT |
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); | |
7686d1cc | 184 | #endif |
1da177e4 LT |
185 | #ifdef CONFIG_SLIP_MODE_SLIP6 |
186 | sl->xdata = 0; | |
187 | sl->xbits = 0; | |
1da177e4 LT |
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); |
30c5f8ec | 196 | slhc_free(slcomp); |
1da177e4 | 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 | |
e28634d6 | 249 | if (mtu > sl->mtu) { |
1da177e4 LT |
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; | |
034de00b | 272 | dev->stats.tx_dropped++; |
1da177e4 LT |
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; | |
034de00b | 282 | dev->stats.rx_over_errors++; |
1da177e4 LT |
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 | 319 | { |
034de00b | 320 | struct net_device *dev = sl->dev; |
1da177e4 LT |
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)) { | |
034de00b | 331 | printk(KERN_WARNING "%s: compressed packet ignored\n", dev->name); |
1da177e4 LT |
332 | return; |
333 | } | |
9ce6cf25 AC |
334 | /* make sure we've reserved enough space for uncompress |
335 | to use */ | |
1da177e4 | 336 | if (count + 80 > sl->buffsize) { |
034de00b | 337 | dev->stats.rx_over_errors++; |
1da177e4 LT |
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; | |
034de00b | 348 | printk(KERN_INFO "%s: header compression turned on\n", dev->name); |
1da177e4 LT |
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 | ||
034de00b | 357 | dev->stats.rx_bytes += count; |
6aa20a22 | 358 | |
1da177e4 | 359 | skb = dev_alloc_skb(count); |
9ce6cf25 | 360 | if (skb == NULL) { |
034de00b TK |
361 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name); |
362 | dev->stats.rx_dropped++; | |
1da177e4 LT |
363 | return; |
364 | } | |
034de00b | 365 | skb->dev = 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); |
61485160 | 369 | netif_rx_ni(skb); |
034de00b | 370 | dev->stats.rx_packets++; |
1da177e4 LT |
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); | |
034de00b | 381 | sl->dev->stats.tx_dropped++; |
1da177e4 LT |
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) |
c2fd03a0 | 393 | count = slip_esc6(p, sl->xbuff, len); |
1da177e4 LT |
394 | else |
395 | #endif | |
c2fd03a0 | 396 | count = slip_esc(p, sl->xbuff, len); |
1da177e4 LT |
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 */ | |
034de00b | 435 | sl->dev->stats.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 | |
1ae5dc34 | 460 | if (time_before(jiffies, dev_trans_start(dev) + 20 * HZ)) { |
1da177e4 LT |
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); | |
034de00b | 498 | dev->stats.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 | ||
034de00b TK |
560 | static struct rtnl_link_stats64 * |
561 | sl_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
1da177e4 | 562 | { |
034de00b | 563 | struct net_device_stats *devstats = &dev->stats; |
1da177e4 | 564 | #ifdef SL_INCLUDE_CSLIP |
034de00b | 565 | struct slip *sl = netdev_priv(dev); |
6f0bee16 | 566 | struct slcompress *comp = sl->slcomp; |
6f0bee16 | 567 | #endif |
034de00b TK |
568 | stats->rx_packets = devstats->rx_packets; |
569 | stats->tx_packets = devstats->tx_packets; | |
570 | stats->rx_bytes = devstats->rx_bytes; | |
571 | stats->tx_bytes = devstats->tx_bytes; | |
f3f70bf6 | 572 | stats->rx_dropped = devstats->rx_dropped; |
034de00b TK |
573 | stats->tx_dropped = devstats->tx_dropped; |
574 | stats->tx_errors = devstats->tx_errors; | |
575 | stats->rx_errors = devstats->rx_errors; | |
576 | stats->rx_over_errors = devstats->rx_over_errors; | |
6f0bee16 | 577 | |
f3f70bf6 MI |
578 | #ifdef SL_INCLUDE_CSLIP |
579 | if (comp) { | |
580 | /* Generic compressed statistics */ | |
581 | stats->rx_compressed = comp->sls_i_compressed; | |
582 | stats->tx_compressed = comp->sls_o_compressed; | |
583 | ||
584 | /* Are we really still needs this? */ | |
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 | |
6f0bee16 | 591 | return stats; |
1da177e4 LT |
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, | |
034de00b | 634 | .ndo_get_stats64 = sl_get_stats64, |
b1da683d SH |
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 | |
55db4c64 LT |
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)) |
55db4c64 | 676 | return; |
1da177e4 LT |
677 | |
678 | /* Read the characters out of the buffer */ | |
55db4c64 | 679 | while (count--) { |
1da177e4 | 680 | if (fp && *fp++) { |
9ce6cf25 | 681 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
034de00b | 682 | sl->dev->stats.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; | |
390fd0b3 | 724 | char name[IFNAMSIZ]; |
1da177e4 LT |
725 | struct net_device *dev = NULL; |
726 | struct slip *sl; | |
727 | ||
1da177e4 LT |
728 | for (i = 0; i < slip_maxdev; i++) { |
729 | dev = slip_devs[i]; | |
730 | if (dev == NULL) | |
731 | break; | |
1da177e4 | 732 | } |
1da177e4 LT |
733 | /* Sorry, too many, all slots in use */ |
734 | if (i >= slip_maxdev) | |
735 | return NULL; | |
736 | ||
390fd0b3 MI |
737 | sprintf(name, "sl%d", i); |
738 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
739 | if (!dev) | |
740 | return NULL; | |
1da177e4 | 741 | |
390fd0b3 | 742 | dev->base_addr = i; |
1da177e4 LT |
743 | sl = netdev_priv(dev); |
744 | ||
745 | /* Initialize channel control data */ | |
746 | sl->magic = SLIP_MAGIC; | |
747 | sl->dev = dev; | |
748 | spin_lock_init(&sl->lock); | |
749 | sl->mode = SL_MODE_DEFAULT; | |
750 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
751 | /* initialize timer_list struct */ |
752 | init_timer(&sl->keepalive_timer); | |
753 | sl->keepalive_timer.data = (unsigned long)sl; | |
754 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 755 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
756 | sl->outfill_timer.data = (unsigned long)sl; |
757 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
758 | #endif |
759 | slip_devs[i] = dev; | |
1da177e4 LT |
760 | return sl; |
761 | } | |
762 | ||
763 | /* | |
764 | * Open the high-level part of the SLIP channel. | |
765 | * This function is called by the TTY module when the | |
766 | * SLIP line discipline is called for. Because we are | |
767 | * sure the tty line exists, we only have to link it to | |
768 | * a free SLIP channel... | |
769 | * | |
770 | * Called in process context serialized from other ldisc calls. | |
771 | */ | |
772 | ||
773 | static int slip_open(struct tty_struct *tty) | |
774 | { | |
775 | struct slip *sl; | |
776 | int err; | |
777 | ||
9ce6cf25 | 778 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 779 | return -EPERM; |
6aa20a22 | 780 | |
f34d7a5b AC |
781 | if (tty->ops->write == NULL) |
782 | return -EOPNOTSUPP; | |
783 | ||
1da177e4 LT |
784 | /* RTnetlink lock is misused here to serialize concurrent |
785 | opens of slip channels. There are better ways, but it is | |
786 | the simplest one. | |
787 | */ | |
788 | rtnl_lock(); | |
789 | ||
790 | /* Collect hanged up channels. */ | |
791 | sl_sync(); | |
792 | ||
9ce6cf25 | 793 | sl = tty->disc_data; |
1da177e4 LT |
794 | |
795 | err = -EEXIST; | |
796 | /* First make sure we're not already connected. */ | |
797 | if (sl && sl->magic == SLIP_MAGIC) | |
798 | goto err_exit; | |
799 | ||
800 | /* OK. Find a free SLIP channel to use. */ | |
801 | err = -ENFILE; | |
9ce6cf25 AC |
802 | sl = sl_alloc(tty_devnum(tty)); |
803 | if (sl == NULL) | |
1da177e4 LT |
804 | goto err_exit; |
805 | ||
806 | sl->tty = tty; | |
807 | tty->disc_data = sl; | |
1da177e4 | 808 | sl->pid = current->pid; |
6aa20a22 | 809 | |
1da177e4 LT |
810 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
811 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
812 | err = sl_alloc_bufs(sl, SL_MTU); |
813 | if (err) | |
1da177e4 LT |
814 | goto err_free_chan; |
815 | ||
816 | set_bit(SLF_INUSE, &sl->flags); | |
817 | ||
9ce6cf25 AC |
818 | err = register_netdevice(sl->dev); |
819 | if (err) | |
1da177e4 LT |
820 | goto err_free_bufs; |
821 | } | |
822 | ||
823 | #ifdef CONFIG_SLIP_SMART | |
824 | if (sl->keepalive) { | |
9ce6cf25 AC |
825 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
826 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
827 | } |
828 | if (sl->outfill) { | |
9ce6cf25 AC |
829 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
830 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
831 | } |
832 | #endif | |
833 | ||
834 | /* Done. We have linked the TTY line to a channel. */ | |
835 | rtnl_unlock(); | |
33f0f88f | 836 | tty->receive_room = 65536; /* We don't flow control */ |
057bef93 MI |
837 | |
838 | /* TTY layer expects 0 on success */ | |
839 | return 0; | |
1da177e4 LT |
840 | |
841 | err_free_bufs: | |
842 | sl_free_bufs(sl); | |
843 | ||
844 | err_free_chan: | |
845 | sl->tty = NULL; | |
846 | tty->disc_data = NULL; | |
847 | clear_bit(SLF_INUSE, &sl->flags); | |
848 | ||
849 | err_exit: | |
850 | rtnl_unlock(); | |
851 | ||
852 | /* Count references from TTY module */ | |
853 | return err; | |
854 | } | |
855 | ||
1da177e4 LT |
856 | /* |
857 | * Close down a SLIP channel. | |
858 | * This means flushing out any pending queues, and then returning. This | |
859 | * call is serialized against other ldisc functions. | |
5342b77c AC |
860 | * |
861 | * We also use this method fo a hangup event | |
1da177e4 | 862 | */ |
5342b77c | 863 | |
9ce6cf25 | 864 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 865 | { |
9ce6cf25 | 866 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
867 | |
868 | /* First make sure we're connected. */ | |
869 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
870 | return; | |
871 | ||
872 | tty->disc_data = NULL; | |
873 | sl->tty = NULL; | |
1da177e4 LT |
874 | |
875 | /* VSV = very important to remove timers */ | |
876 | #ifdef CONFIG_SLIP_SMART | |
877 | del_timer_sync(&sl->keepalive_timer); | |
878 | del_timer_sync(&sl->outfill_timer); | |
879 | #endif | |
5342b77c AC |
880 | /* Flush network side */ |
881 | unregister_netdev(sl->dev); | |
882 | /* This will complete via sl_free_netdev */ | |
1da177e4 LT |
883 | } |
884 | ||
5342b77c AC |
885 | static int slip_hangup(struct tty_struct *tty) |
886 | { | |
887 | slip_close(tty); | |
888 | return 0; | |
889 | } | |
1da177e4 LT |
890 | /************************************************************************ |
891 | * STANDARD SLIP ENCAPSULATION * | |
892 | ************************************************************************/ | |
893 | ||
9ce6cf25 | 894 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
895 | { |
896 | unsigned char *ptr = d; | |
897 | unsigned char c; | |
898 | ||
899 | /* | |
900 | * Send an initial END character to flush out any | |
901 | * data that may have accumulated in the receiver | |
902 | * due to line noise. | |
903 | */ | |
904 | ||
905 | *ptr++ = END; | |
906 | ||
907 | /* | |
908 | * For each byte in the packet, send the appropriate | |
909 | * character sequence, according to the SLIP protocol. | |
910 | */ | |
911 | ||
912 | while (len-- > 0) { | |
9ce6cf25 AC |
913 | switch (c = *s++) { |
914 | case END: | |
1da177e4 LT |
915 | *ptr++ = ESC; |
916 | *ptr++ = ESC_END; | |
917 | break; | |
9ce6cf25 | 918 | case ESC: |
1da177e4 LT |
919 | *ptr++ = ESC; |
920 | *ptr++ = ESC_ESC; | |
921 | break; | |
9ce6cf25 | 922 | default: |
1da177e4 LT |
923 | *ptr++ = c; |
924 | break; | |
925 | } | |
926 | } | |
927 | *ptr++ = END; | |
807540ba | 928 | return ptr - d; |
1da177e4 LT |
929 | } |
930 | ||
931 | static void slip_unesc(struct slip *sl, unsigned char s) | |
932 | { | |
933 | ||
9ce6cf25 AC |
934 | switch (s) { |
935 | case END: | |
1da177e4 LT |
936 | #ifdef CONFIG_SLIP_SMART |
937 | /* drop keeptest bit = VSV */ | |
938 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
939 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
940 | #endif | |
941 | ||
8e95a202 JP |
942 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
943 | (sl->rcount > 2)) | |
1da177e4 | 944 | sl_bump(sl); |
1da177e4 LT |
945 | clear_bit(SLF_ESCAPE, &sl->flags); |
946 | sl->rcount = 0; | |
947 | return; | |
948 | ||
9ce6cf25 | 949 | case ESC: |
1da177e4 LT |
950 | set_bit(SLF_ESCAPE, &sl->flags); |
951 | return; | |
9ce6cf25 AC |
952 | case ESC_ESC: |
953 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 954 | s = ESC; |
1da177e4 | 955 | break; |
9ce6cf25 AC |
956 | case ESC_END: |
957 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 958 | s = END; |
1da177e4 LT |
959 | break; |
960 | } | |
961 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
962 | if (sl->rcount < sl->buffsize) { | |
963 | sl->rbuff[sl->rcount++] = s; | |
964 | return; | |
965 | } | |
034de00b | 966 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
967 | set_bit(SLF_ERROR, &sl->flags); |
968 | } | |
969 | } | |
970 | ||
971 | ||
972 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
973 | /************************************************************************ | |
974 | * 6 BIT SLIP ENCAPSULATION * | |
975 | ************************************************************************/ | |
976 | ||
9ce6cf25 | 977 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
978 | { |
979 | unsigned char *ptr = d; | |
980 | unsigned char c; | |
981 | int i; | |
982 | unsigned short v = 0; | |
983 | short bits = 0; | |
984 | ||
985 | /* | |
986 | * Send an initial END character to flush out any | |
987 | * data that may have accumulated in the receiver | |
988 | * due to line noise. | |
989 | */ | |
990 | ||
991 | *ptr++ = 0x70; | |
992 | ||
993 | /* | |
994 | * Encode the packet into printable ascii characters | |
995 | */ | |
996 | ||
997 | for (i = 0; i < len; ++i) { | |
998 | v = (v << 8) | s[i]; | |
999 | bits += 8; | |
1000 | while (bits >= 6) { | |
1001 | bits -= 6; | |
1002 | c = 0x30 + ((v >> bits) & 0x3F); | |
1003 | *ptr++ = c; | |
1004 | } | |
1005 | } | |
1006 | if (bits) { | |
1007 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1008 | *ptr++ = c; | |
1009 | } | |
1010 | *ptr++ = 0x70; | |
1011 | return ptr - d; | |
1012 | } | |
1013 | ||
9ce6cf25 | 1014 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1015 | { |
1016 | unsigned char c; | |
1017 | ||
1018 | if (s == 0x70) { | |
1019 | #ifdef CONFIG_SLIP_SMART | |
1020 | /* drop keeptest bit = VSV */ | |
1021 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1022 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1023 | #endif | |
1024 | ||
8e95a202 JP |
1025 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
1026 | (sl->rcount > 2)) | |
1da177e4 | 1027 | sl_bump(sl); |
1da177e4 LT |
1028 | sl->rcount = 0; |
1029 | sl->xbits = 0; | |
1030 | sl->xdata = 0; | |
9ce6cf25 | 1031 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1032 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1033 | sl->xbits += 6; | |
1034 | if (sl->xbits >= 8) { | |
1035 | sl->xbits -= 8; | |
1036 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1037 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1038 | if (sl->rcount < sl->buffsize) { | |
1039 | sl->rbuff[sl->rcount++] = c; | |
1040 | return; | |
1041 | } | |
034de00b | 1042 | sl->dev->stats.rx_over_errors++; |
1da177e4 LT |
1043 | set_bit(SLF_ERROR, &sl->flags); |
1044 | } | |
1045 | } | |
9ce6cf25 | 1046 | } |
1da177e4 LT |
1047 | } |
1048 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1049 | ||
1050 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1051 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1052 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1053 | { |
9ce6cf25 | 1054 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1055 | unsigned int tmp; |
1056 | int __user *p = (int __user *)arg; | |
1057 | ||
1058 | /* First make sure we're connected. */ | |
9ce6cf25 | 1059 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1060 | return -EINVAL; |
1da177e4 | 1061 | |
9ce6cf25 AC |
1062 | switch (cmd) { |
1063 | case SIOCGIFNAME: | |
1da177e4 LT |
1064 | tmp = strlen(sl->dev->name) + 1; |
1065 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1066 | return -EFAULT; | |
1067 | return 0; | |
1068 | ||
1069 | case SIOCGIFENCAP: | |
1070 | if (put_user(sl->mode, p)) | |
1071 | return -EFAULT; | |
1072 | return 0; | |
1073 | ||
1074 | case SIOCSIFENCAP: | |
1075 | if (get_user(tmp, p)) | |
1076 | return -EFAULT; | |
1077 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1078 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1079 | return -EINVAL; |
1da177e4 LT |
1080 | #else |
1081 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1082 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1083 | /* return -EINVAL; */ |
1084 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1085 | #endif |
1086 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1087 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1088 | return -EINVAL; |
1da177e4 LT |
1089 | #endif |
1090 | sl->mode = tmp; | |
9ce6cf25 | 1091 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1092 | return 0; |
1093 | ||
9ce6cf25 | 1094 | case SIOCSIFHWADDR: |
1da177e4 LT |
1095 | return -EINVAL; |
1096 | ||
1097 | #ifdef CONFIG_SLIP_SMART | |
1098 | /* VSV changes start here */ | |
9ce6cf25 | 1099 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1100 | if (get_user(tmp, p)) |
1101 | return -EFAULT; | |
9ce6cf25 | 1102 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1103 | return -EINVAL; |
1104 | ||
1105 | spin_lock_bh(&sl->lock); | |
1106 | if (!sl->tty) { | |
1107 | spin_unlock_bh(&sl->lock); | |
1108 | return -ENODEV; | |
1109 | } | |
9ce6cf25 AC |
1110 | sl->keepalive = (u8)tmp; |
1111 | if (sl->keepalive != 0) { | |
1112 | mod_timer(&sl->keepalive_timer, | |
1113 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1114 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1115 | } else |
1116 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1117 | spin_unlock_bh(&sl->lock); |
1118 | return 0; | |
1119 | ||
9ce6cf25 | 1120 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1121 | if (put_user(sl->keepalive, p)) |
1122 | return -EFAULT; | |
1123 | return 0; | |
1124 | ||
9ce6cf25 | 1125 | case SIOCSOUTFILL: |
1da177e4 LT |
1126 | if (get_user(tmp, p)) |
1127 | return -EFAULT; | |
9ce6cf25 | 1128 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1129 | return -EINVAL; |
1130 | spin_lock_bh(&sl->lock); | |
1131 | if (!sl->tty) { | |
1132 | spin_unlock_bh(&sl->lock); | |
1133 | return -ENODEV; | |
1134 | } | |
9ce6cf25 AC |
1135 | sl->outfill = (u8)tmp; |
1136 | if (sl->outfill != 0) { | |
1137 | mod_timer(&sl->outfill_timer, | |
1138 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1139 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1140 | } else |
1141 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1142 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1143 | return 0; |
1da177e4 | 1144 | |
9ce6cf25 | 1145 | case SIOCGOUTFILL: |
1da177e4 LT |
1146 | if (put_user(sl->outfill, p)) |
1147 | return -EFAULT; | |
1148 | return 0; | |
1149 | /* VSV changes end */ | |
1150 | #endif | |
1da177e4 | 1151 | default: |
d0127539 | 1152 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1153 | } |
1154 | } | |
1155 | ||
9646e7ce AB |
1156 | #ifdef CONFIG_COMPAT |
1157 | static long slip_compat_ioctl(struct tty_struct *tty, struct file *file, | |
1158 | unsigned int cmd, unsigned long arg) | |
1159 | { | |
1160 | switch (cmd) { | |
1161 | case SIOCGIFNAME: | |
1162 | case SIOCGIFENCAP: | |
1163 | case SIOCSIFENCAP: | |
1164 | case SIOCSIFHWADDR: | |
1165 | case SIOCSKEEPALIVE: | |
1166 | case SIOCGKEEPALIVE: | |
1167 | case SIOCSOUTFILL: | |
1168 | case SIOCGOUTFILL: | |
1169 | return slip_ioctl(tty, file, cmd, | |
1170 | (unsigned long)compat_ptr(arg)); | |
1171 | } | |
1172 | ||
1173 | return -ENOIOCTLCMD; | |
1174 | } | |
1175 | #endif | |
1176 | ||
1da177e4 LT |
1177 | /* VSV changes start here */ |
1178 | #ifdef CONFIG_SLIP_SMART | |
1179 | /* function do_ioctl called from net/core/dev.c | |
1180 | to allow get/set outfill/keepalive parameter | |
1181 | by ifconfig */ | |
1182 | ||
9ce6cf25 | 1183 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1184 | { |
1185 | struct slip *sl = netdev_priv(dev); | |
1186 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1187 | ||
1188 | if (sl == NULL) /* Allocation failed ?? */ | |
1189 | return -ENODEV; | |
1190 | ||
1191 | spin_lock_bh(&sl->lock); | |
1192 | ||
1193 | if (!sl->tty) { | |
1194 | spin_unlock_bh(&sl->lock); | |
1195 | return -ENODEV; | |
1196 | } | |
1197 | ||
9ce6cf25 AC |
1198 | switch (cmd) { |
1199 | case SIOCSKEEPALIVE: | |
1da177e4 | 1200 | /* max for unchar */ |
9ce6cf25 | 1201 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1202 | spin_unlock_bh(&sl->lock); |
1203 | return -EINVAL; | |
1204 | } | |
9ce6cf25 | 1205 | sl->keepalive = (u8)*p; |
1da177e4 | 1206 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1207 | sl->keepalive_timer.expires = |
1208 | jiffies + sl->keepalive * HZ; | |
1209 | mod_timer(&sl->keepalive_timer, | |
1210 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1211 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1212 | } else |
1213 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1214 | break; |
1215 | ||
9ce6cf25 | 1216 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1217 | *p = sl->keepalive; |
1218 | break; | |
1219 | ||
9ce6cf25 AC |
1220 | case SIOCSOUTFILL: |
1221 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1222 | spin_unlock_bh(&sl->lock); |
1223 | return -EINVAL; | |
1224 | } | |
9ce6cf25 AC |
1225 | sl->outfill = (u8)*p; |
1226 | if (sl->outfill != 0) { | |
1227 | mod_timer(&sl->outfill_timer, | |
1228 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1229 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1230 | } else |
1231 | del_timer(&sl->outfill_timer); | |
1232 | break; | |
1da177e4 | 1233 | |
9ce6cf25 | 1234 | case SIOCGOUTFILL: |
1da177e4 LT |
1235 | *p = sl->outfill; |
1236 | break; | |
1237 | ||
9ce6cf25 | 1238 | case SIOCSLEASE: |
6aa20a22 | 1239 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1240 | and opened by another process device. |
1241 | */ | |
9ce6cf25 AC |
1242 | if (sl->tty != current->signal->tty && |
1243 | sl->pid != current->pid) { | |
1da177e4 LT |
1244 | spin_unlock_bh(&sl->lock); |
1245 | return -EPERM; | |
1246 | } | |
1247 | sl->leased = 0; | |
9ce6cf25 | 1248 | if (*p) |
1da177e4 | 1249 | sl->leased = 1; |
9ce6cf25 | 1250 | break; |
1da177e4 | 1251 | |
9ce6cf25 | 1252 | case SIOCGLEASE: |
1da177e4 | 1253 | *p = sl->leased; |
ee289b64 | 1254 | } |
1da177e4 LT |
1255 | spin_unlock_bh(&sl->lock); |
1256 | return 0; | |
1257 | } | |
1258 | #endif | |
1259 | /* VSV changes end */ | |
1260 | ||
a352def2 | 1261 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 LT |
1262 | .owner = THIS_MODULE, |
1263 | .magic = TTY_LDISC_MAGIC, | |
1264 | .name = "slip", | |
1265 | .open = slip_open, | |
1266 | .close = slip_close, | |
5342b77c | 1267 | .hangup = slip_hangup, |
1da177e4 | 1268 | .ioctl = slip_ioctl, |
9646e7ce AB |
1269 | #ifdef CONFIG_COMPAT |
1270 | .compat_ioctl = slip_compat_ioctl, | |
1271 | #endif | |
1da177e4 | 1272 | .receive_buf = slip_receive_buf, |
1da177e4 LT |
1273 | .write_wakeup = slip_write_wakeup, |
1274 | }; | |
1275 | ||
1276 | static int __init slip_init(void) | |
1277 | { | |
1278 | int status; | |
1279 | ||
1280 | if (slip_maxdev < 4) | |
1281 | slip_maxdev = 4; /* Sanity */ | |
1282 | ||
1283 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1284 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1285 | " (6 bit encapsulation enabled)" | |
1286 | #endif | |
1287 | ".\n", | |
9ce6cf25 | 1288 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1289 | #if defined(SL_INCLUDE_CSLIP) |
1290 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1291 | #endif | |
1292 | #ifdef CONFIG_SLIP_SMART | |
1293 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1294 | #endif | |
1295 | ||
9ce6cf25 AC |
1296 | slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev, |
1297 | GFP_KERNEL); | |
e404decb | 1298 | if (!slip_devs) |
1da177e4 | 1299 | return -ENOMEM; |
1da177e4 | 1300 | |
1da177e4 | 1301 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1302 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1303 | if (status != 0) { | |
1da177e4 LT |
1304 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1305 | kfree(slip_devs); | |
1306 | } | |
1307 | return status; | |
1308 | } | |
1309 | ||
1310 | static void __exit slip_exit(void) | |
1311 | { | |
1312 | int i; | |
1313 | struct net_device *dev; | |
1314 | struct slip *sl; | |
1315 | unsigned long timeout = jiffies + HZ; | |
1316 | int busy = 0; | |
1317 | ||
6aa20a22 | 1318 | if (slip_devs == NULL) |
1da177e4 LT |
1319 | return; |
1320 | ||
1321 | /* First of all: check for active disciplines and hangup them. | |
1322 | */ | |
1323 | do { | |
a9fc2510 NA |
1324 | if (busy) |
1325 | msleep_interruptible(100); | |
1da177e4 LT |
1326 | |
1327 | busy = 0; | |
1328 | for (i = 0; i < slip_maxdev; i++) { | |
1329 | dev = slip_devs[i]; | |
1330 | if (!dev) | |
1331 | continue; | |
1332 | sl = netdev_priv(dev); | |
1333 | spin_lock_bh(&sl->lock); | |
1334 | if (sl->tty) { | |
1335 | busy++; | |
1336 | tty_hangup(sl->tty); | |
1337 | } | |
1338 | spin_unlock_bh(&sl->lock); | |
1339 | } | |
1340 | } while (busy && time_before(jiffies, timeout)); | |
1341 | ||
5342b77c AC |
1342 | /* FIXME: hangup is async so we should wait when doing this second |
1343 | phase */ | |
1da177e4 LT |
1344 | |
1345 | for (i = 0; i < slip_maxdev; i++) { | |
1346 | dev = slip_devs[i]; | |
1347 | if (!dev) | |
1348 | continue; | |
1349 | slip_devs[i] = NULL; | |
1350 | ||
1351 | sl = netdev_priv(dev); | |
1352 | if (sl->tty) { | |
1353 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1354 | dev->name); | |
1355 | /* Intentionally leak the control block. */ | |
1356 | dev->destructor = NULL; | |
6aa20a22 | 1357 | } |
1da177e4 LT |
1358 | |
1359 | unregister_netdev(dev); | |
1360 | } | |
1361 | ||
1362 | kfree(slip_devs); | |
1363 | slip_devs = NULL; | |
1364 | ||
9ce6cf25 AC |
1365 | i = tty_unregister_ldisc(N_SLIP); |
1366 | if (i != 0) | |
1da177e4 | 1367 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1368 | } |
1369 | ||
1370 | module_init(slip_init); | |
1371 | module_exit(slip_exit); | |
1372 | ||
1373 | #ifdef CONFIG_SLIP_SMART | |
1374 | /* | |
1375 | * This is start of the code for multislip style line checking | |
1376 | * added by Stanislav Voronyi. All changes before marked VSV | |
1377 | */ | |
1378 | ||
1379 | static void sl_outfill(unsigned long sls) | |
1380 | { | |
9ce6cf25 | 1381 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1382 | |
1383 | spin_lock(&sl->lock); | |
1384 | ||
1385 | if (sl->tty == NULL) | |
1386 | goto out; | |
1387 | ||
9ce6cf25 AC |
1388 | if (sl->outfill) { |
1389 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1390 | /* no packets were transmitted, do outfill */ |
1391 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1392 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1393 | #else | |
1394 | unsigned char s = END; | |
1395 | #endif | |
1396 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1397 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1398 | /* if device busy no outfill */ |
f34d7a5b | 1399 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1400 | } |
9ce6cf25 | 1401 | } else |
1da177e4 LT |
1402 | set_bit(SLF_OUTWAIT, &sl->flags); |
1403 | ||
1404 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1405 | } | |
1406 | out: | |
1407 | spin_unlock(&sl->lock); | |
1408 | } | |
1409 | ||
1410 | static void sl_keepalive(unsigned long sls) | |
1411 | { | |
9ce6cf25 | 1412 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1413 | |
1414 | spin_lock(&sl->lock); | |
1415 | ||
1416 | if (sl->tty == NULL) | |
1417 | goto out; | |
1418 | ||
9ce6cf25 AC |
1419 | if (sl->keepalive) { |
1420 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1421 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1422 | if (sl->outfill) |
1423 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1424 | (void)del_timer(&sl->outfill_timer); |
1425 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1426 | /* this must hangup tty & close slip */ |
1427 | tty_hangup(sl->tty); | |
1da177e4 LT |
1428 | /* I think we need not something else */ |
1429 | goto out; | |
9ce6cf25 | 1430 | } else |
1da177e4 LT |
1431 | set_bit(SLF_KEEPTEST, &sl->flags); |
1432 | ||
1433 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1434 | } | |
1da177e4 LT |
1435 | out: |
1436 | spin_unlock(&sl->lock); | |
1437 | } | |
1438 | ||
1439 | #endif | |
1440 | MODULE_LICENSE("GPL"); | |
1441 | MODULE_ALIAS_LDISC(N_SLIP); |