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 | ||
67 | #include <asm/system.h> | |
68 | #include <asm/uaccess.h> | |
69 | #include <linux/bitops.h> | |
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> | |
12dc2fdd | 82 | #include <linux/delay.h> |
1da177e4 LT |
83 | #include <linux/init.h> |
84 | #include "slip.h" | |
85 | #ifdef CONFIG_INET | |
86 | #include <linux/ip.h> | |
87 | #include <linux/tcp.h> | |
88 | #include <net/slhc_vj.h> | |
89 | #endif | |
90 | ||
91 | #define SLIP_VERSION "0.8.4-NET3.019-NEWTTY" | |
92 | ||
93 | static struct net_device **slip_devs; | |
94 | ||
95 | static int slip_maxdev = SL_NRUNIT; | |
96 | module_param(slip_maxdev, int, 0); | |
97 | MODULE_PARM_DESC(slip_maxdev, "Maximum number of slip devices"); | |
98 | ||
99 | static int slip_esc(unsigned char *p, unsigned char *d, int len); | |
100 | static void slip_unesc(struct slip *sl, unsigned char c); | |
101 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
102 | static int slip_esc6(unsigned char *p, unsigned char *d, int len); | |
103 | static void slip_unesc6(struct slip *sl, unsigned char c); | |
104 | #endif | |
105 | #ifdef CONFIG_SLIP_SMART | |
106 | static void sl_keepalive(unsigned long sls); | |
107 | static void sl_outfill(unsigned long sls); | |
9ce6cf25 | 108 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); |
1da177e4 LT |
109 | #endif |
110 | ||
111 | /******************************** | |
112 | * Buffer administration routines: | |
113 | * sl_alloc_bufs() | |
114 | * sl_free_bufs() | |
115 | * sl_realloc_bufs() | |
116 | * | |
117 | * NOTE: sl_realloc_bufs != sl_free_bufs + sl_alloc_bufs, because | |
118 | * sl_realloc_bufs provides strong atomicity and reallocation | |
119 | * on actively running device. | |
120 | *********************************/ | |
121 | ||
6aa20a22 | 122 | /* |
1da177e4 LT |
123 | Allocate channel buffers. |
124 | */ | |
125 | ||
9ce6cf25 | 126 | static int sl_alloc_bufs(struct slip *sl, int mtu) |
1da177e4 LT |
127 | { |
128 | int err = -ENOBUFS; | |
129 | unsigned long len; | |
9ce6cf25 AC |
130 | char *rbuff = NULL; |
131 | char *xbuff = NULL; | |
1da177e4 | 132 | #ifdef SL_INCLUDE_CSLIP |
9ce6cf25 | 133 | char *cbuff = NULL; |
1da177e4 LT |
134 | struct slcompress *slcomp = NULL; |
135 | #endif | |
136 | ||
137 | /* | |
138 | * Allocate the SLIP frame buffers: | |
139 | * | |
140 | * rbuff Receive buffer. | |
141 | * xbuff Transmit buffer. | |
142 | * cbuff Temporary compression buffer. | |
143 | */ | |
144 | len = mtu * 2; | |
145 | ||
146 | /* | |
147 | * allow for arrival of larger UDP packets, even if we say not to | |
148 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
149 | * an MSS of 128 | |
150 | */ | |
151 | if (len < 576 * 2) | |
152 | len = 576 * 2; | |
153 | rbuff = kmalloc(len + 4, GFP_KERNEL); | |
154 | if (rbuff == NULL) | |
155 | goto err_exit; | |
156 | xbuff = kmalloc(len + 4, GFP_KERNEL); | |
157 | if (xbuff == NULL) | |
158 | goto err_exit; | |
159 | #ifdef SL_INCLUDE_CSLIP | |
160 | cbuff = kmalloc(len + 4, GFP_KERNEL); | |
161 | if (cbuff == NULL) | |
162 | goto err_exit; | |
163 | slcomp = slhc_init(16, 16); | |
164 | if (slcomp == NULL) | |
165 | goto err_exit; | |
166 | #endif | |
167 | spin_lock_bh(&sl->lock); | |
168 | if (sl->tty == NULL) { | |
169 | spin_unlock_bh(&sl->lock); | |
170 | err = -ENODEV; | |
171 | goto err_exit; | |
172 | } | |
173 | sl->mtu = mtu; | |
174 | sl->buffsize = len; | |
175 | sl->rcount = 0; | |
176 | sl->xleft = 0; | |
177 | rbuff = xchg(&sl->rbuff, rbuff); | |
178 | xbuff = xchg(&sl->xbuff, xbuff); | |
179 | #ifdef SL_INCLUDE_CSLIP | |
180 | cbuff = xchg(&sl->cbuff, cbuff); | |
181 | slcomp = xchg(&sl->slcomp, slcomp); | |
182 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
183 | sl->xdata = 0; | |
184 | sl->xbits = 0; | |
185 | #endif | |
186 | #endif | |
187 | spin_unlock_bh(&sl->lock); | |
188 | err = 0; | |
189 | ||
190 | /* Cleanup */ | |
191 | err_exit: | |
192 | #ifdef SL_INCLUDE_CSLIP | |
158a0e45 | 193 | kfree(cbuff); |
1da177e4 LT |
194 | if (slcomp) |
195 | slhc_free(slcomp); | |
196 | #endif | |
158a0e45 JJ |
197 | kfree(xbuff); |
198 | kfree(rbuff); | |
1da177e4 LT |
199 | return err; |
200 | } | |
201 | ||
202 | /* Free a SLIP channel buffers. */ | |
9ce6cf25 | 203 | static void sl_free_bufs(struct slip *sl) |
1da177e4 | 204 | { |
1da177e4 | 205 | /* Free all SLIP frame buffers. */ |
9b200b02 JJ |
206 | kfree(xchg(&sl->rbuff, NULL)); |
207 | kfree(xchg(&sl->xbuff, NULL)); | |
1da177e4 | 208 | #ifdef SL_INCLUDE_CSLIP |
9b200b02 JJ |
209 | kfree(xchg(&sl->cbuff, NULL)); |
210 | slhc_free(xchg(&sl->slcomp, NULL)); | |
1da177e4 LT |
211 | #endif |
212 | } | |
213 | ||
6aa20a22 | 214 | /* |
1da177e4 LT |
215 | Reallocate slip channel buffers. |
216 | */ | |
217 | ||
218 | static int sl_realloc_bufs(struct slip *sl, int mtu) | |
219 | { | |
220 | int err = 0; | |
221 | struct net_device *dev = sl->dev; | |
222 | unsigned char *xbuff, *rbuff; | |
223 | #ifdef SL_INCLUDE_CSLIP | |
224 | unsigned char *cbuff; | |
225 | #endif | |
226 | int len = mtu * 2; | |
227 | ||
228 | /* | |
229 | * allow for arrival of larger UDP packets, even if we say not to | |
230 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
231 | * an MSS of 128 | |
232 | */ | |
233 | if (len < 576 * 2) | |
234 | len = 576 * 2; | |
235 | ||
5cbded58 RD |
236 | xbuff = kmalloc(len + 4, GFP_ATOMIC); |
237 | rbuff = kmalloc(len + 4, GFP_ATOMIC); | |
1da177e4 | 238 | #ifdef SL_INCLUDE_CSLIP |
5cbded58 | 239 | cbuff = kmalloc(len + 4, GFP_ATOMIC); |
1da177e4 LT |
240 | #endif |
241 | ||
242 | ||
243 | #ifdef SL_INCLUDE_CSLIP | |
244 | if (xbuff == NULL || rbuff == NULL || cbuff == NULL) { | |
245 | #else | |
246 | if (xbuff == NULL || rbuff == NULL) { | |
247 | #endif | |
248 | if (mtu >= sl->mtu) { | |
249 | printk(KERN_WARNING "%s: unable to grow slip buffers, MTU change cancelled.\n", | |
250 | dev->name); | |
251 | err = -ENOBUFS; | |
252 | } | |
253 | goto done; | |
254 | } | |
1da177e4 LT |
255 | spin_lock_bh(&sl->lock); |
256 | ||
257 | err = -ENODEV; | |
258 | if (sl->tty == NULL) | |
259 | goto done_on_bh; | |
260 | ||
261 | xbuff = xchg(&sl->xbuff, xbuff); | |
262 | rbuff = xchg(&sl->rbuff, rbuff); | |
263 | #ifdef SL_INCLUDE_CSLIP | |
264 | cbuff = xchg(&sl->cbuff, cbuff); | |
265 | #endif | |
266 | if (sl->xleft) { | |
267 | if (sl->xleft <= len) { | |
268 | memcpy(sl->xbuff, sl->xhead, sl->xleft); | |
269 | } else { | |
270 | sl->xleft = 0; | |
271 | sl->tx_dropped++; | |
272 | } | |
273 | } | |
274 | sl->xhead = sl->xbuff; | |
275 | ||
276 | if (sl->rcount) { | |
277 | if (sl->rcount <= len) { | |
278 | memcpy(sl->rbuff, rbuff, sl->rcount); | |
279 | } else { | |
280 | sl->rcount = 0; | |
281 | sl->rx_over_errors++; | |
282 | set_bit(SLF_ERROR, &sl->flags); | |
283 | } | |
284 | } | |
285 | sl->mtu = mtu; | |
286 | dev->mtu = mtu; | |
287 | sl->buffsize = len; | |
288 | err = 0; | |
289 | ||
290 | done_on_bh: | |
291 | spin_unlock_bh(&sl->lock); | |
292 | ||
293 | done: | |
158a0e45 JJ |
294 | kfree(xbuff); |
295 | kfree(rbuff); | |
1da177e4 | 296 | #ifdef SL_INCLUDE_CSLIP |
158a0e45 | 297 | kfree(cbuff); |
1da177e4 LT |
298 | #endif |
299 | return err; | |
300 | } | |
301 | ||
302 | ||
303 | /* Set the "sending" flag. This must be atomic hence the set_bit. */ | |
9ce6cf25 | 304 | static inline void sl_lock(struct slip *sl) |
1da177e4 LT |
305 | { |
306 | netif_stop_queue(sl->dev); | |
307 | } | |
308 | ||
309 | ||
310 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ | |
9ce6cf25 | 311 | static inline void sl_unlock(struct slip *sl) |
1da177e4 LT |
312 | { |
313 | netif_wake_queue(sl->dev); | |
314 | } | |
315 | ||
316 | /* Send one completely decapsulated IP datagram to the IP layer. */ | |
9ce6cf25 | 317 | static void sl_bump(struct slip *sl) |
1da177e4 LT |
318 | { |
319 | struct sk_buff *skb; | |
320 | int count; | |
321 | ||
322 | count = sl->rcount; | |
323 | #ifdef SL_INCLUDE_CSLIP | |
324 | if (sl->mode & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) { | |
9ce6cf25 AC |
325 | unsigned char c = sl->rbuff[0]; |
326 | if (c & SL_TYPE_COMPRESSED_TCP) { | |
1da177e4 LT |
327 | /* ignore compressed packets when CSLIP is off */ |
328 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
329 | printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name); | |
330 | return; | |
331 | } | |
9ce6cf25 AC |
332 | /* make sure we've reserved enough space for uncompress |
333 | to use */ | |
1da177e4 LT |
334 | if (count + 80 > sl->buffsize) { |
335 | sl->rx_over_errors++; | |
336 | return; | |
337 | } | |
338 | count = slhc_uncompress(sl->slcomp, sl->rbuff, count); | |
9ce6cf25 | 339 | if (count <= 0) |
1da177e4 | 340 | return; |
1da177e4 LT |
341 | } else if (c >= SL_TYPE_UNCOMPRESSED_TCP) { |
342 | if (!(sl->mode & SL_MODE_CSLIP)) { | |
343 | /* turn on header compression */ | |
344 | sl->mode |= SL_MODE_CSLIP; | |
345 | sl->mode &= ~SL_MODE_ADAPTIVE; | |
346 | printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name); | |
347 | } | |
348 | sl->rbuff[0] &= 0x4f; | |
9ce6cf25 | 349 | if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0) |
1da177e4 | 350 | return; |
1da177e4 LT |
351 | } |
352 | } | |
353 | #endif /* SL_INCLUDE_CSLIP */ | |
354 | ||
9ce6cf25 | 355 | sl->rx_bytes += count; |
6aa20a22 | 356 | |
1da177e4 | 357 | skb = dev_alloc_skb(count); |
9ce6cf25 | 358 | if (skb == NULL) { |
1da177e4 LT |
359 | printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name); |
360 | sl->rx_dropped++; | |
361 | return; | |
362 | } | |
363 | skb->dev = sl->dev; | |
9ce6cf25 | 364 | memcpy(skb_put(skb, count), sl->rbuff, count); |
98e399f8 | 365 | skb_reset_mac_header(skb); |
9ce6cf25 | 366 | skb->protocol = htons(ETH_P_IP); |
1da177e4 LT |
367 | netif_rx(skb); |
368 | sl->dev->last_rx = jiffies; | |
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, | |
399 | * the transfer may be completed inside driver.write() | |
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 | */ | |
405 | sl->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); | |
406 | actual = sl->tty->driver->write(sl->tty, sl->xbuff, count); | |
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++; | |
435 | tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
436 | sl_unlock(sl); | |
437 | return; | |
438 | } | |
439 | ||
440 | actual = tty->driver->write(tty, sl->xhead, sl->xleft); | |
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, | |
465 | (sl->tty->driver->chars_in_buffer(sl->tty) || sl->xleft) ? | |
466 | "bad line quality" : "driver error"); | |
1da177e4 LT |
467 | sl->xleft = 0; |
468 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
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. */ | |
478 | static int | |
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); | |
488 | return 0; | |
489 | } | |
490 | if (sl->tty == NULL) { | |
491 | spin_unlock(&sl->lock); | |
492 | dev_kfree_skb(skb); | |
493 | return 0; | |
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); | |
502 | return 0; | |
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); | |
518 | if (sl->tty) { | |
519 | /* TTY discipline is running. */ | |
520 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
521 | } | |
522 | netif_stop_queue(dev); | |
523 | sl->rcount = 0; | |
524 | sl->xleft = 0; | |
525 | spin_unlock_bh(&sl->lock); | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | /* Netdevice DOWN -> UP routine */ | |
531 | ||
532 | static int sl_open(struct net_device *dev) | |
533 | { | |
534 | struct slip *sl = netdev_priv(dev); | |
535 | ||
9ce6cf25 | 536 | if (sl->tty == NULL) |
1da177e4 LT |
537 | return -ENODEV; |
538 | ||
539 | sl->flags &= (1 << SLF_INUSE); | |
540 | netif_start_queue(dev); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* Netdevice change MTU request */ | |
545 | ||
546 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
547 | { | |
548 | struct slip *sl = netdev_priv(dev); | |
549 | ||
550 | if (new_mtu < 68 || new_mtu > 65534) | |
551 | return -EINVAL; | |
552 | ||
553 | if (new_mtu != dev->mtu) | |
554 | return sl_realloc_bufs(sl, new_mtu); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | /* Netdevice get statistics request */ | |
559 | ||
560 | static struct net_device_stats * | |
561 | sl_get_stats(struct net_device *dev) | |
562 | { | |
563 | static struct net_device_stats stats; | |
564 | struct slip *sl = netdev_priv(dev); | |
565 | #ifdef SL_INCLUDE_CSLIP | |
566 | struct slcompress *comp; | |
567 | #endif | |
568 | ||
569 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
570 | ||
571 | stats.rx_packets = sl->rx_packets; | |
572 | stats.tx_packets = sl->tx_packets; | |
573 | stats.rx_bytes = sl->rx_bytes; | |
574 | stats.tx_bytes = sl->tx_bytes; | |
575 | stats.rx_dropped = sl->rx_dropped; | |
576 | stats.tx_dropped = sl->tx_dropped; | |
577 | stats.tx_errors = sl->tx_errors; | |
578 | stats.rx_errors = sl->rx_errors; | |
579 | stats.rx_over_errors = sl->rx_over_errors; | |
580 | #ifdef SL_INCLUDE_CSLIP | |
581 | stats.rx_fifo_errors = sl->rx_compressed; | |
582 | stats.tx_fifo_errors = sl->tx_compressed; | |
583 | stats.collisions = sl->tx_misses; | |
584 | comp = sl->slcomp; | |
585 | if (comp) { | |
586 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
587 | stats.rx_dropped += comp->sls_i_tossed; | |
588 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
589 | stats.collisions += comp->sls_o_misses; | |
590 | } | |
591 | #endif /* CONFIG_INET */ | |
592 | return (&stats); | |
593 | } | |
594 | ||
595 | /* Netdevice register callback */ | |
596 | ||
597 | static int sl_init(struct net_device *dev) | |
598 | { | |
599 | struct slip *sl = netdev_priv(dev); | |
600 | ||
601 | /* | |
6aa20a22 | 602 | * Finish setting up the DEVICE info. |
1da177e4 LT |
603 | */ |
604 | ||
605 | dev->mtu = sl->mtu; | |
606 | dev->type = ARPHRD_SLIP + sl->mode; | |
607 | #ifdef SL_CHECK_TRANSMIT | |
608 | dev->tx_timeout = sl_tx_timeout; | |
609 | dev->watchdog_timeo = 20*HZ; | |
610 | #endif | |
611 | return 0; | |
612 | } | |
613 | ||
614 | ||
615 | static void sl_uninit(struct net_device *dev) | |
616 | { | |
617 | struct slip *sl = netdev_priv(dev); | |
618 | ||
619 | sl_free_bufs(sl); | |
620 | } | |
621 | ||
622 | static void sl_setup(struct net_device *dev) | |
623 | { | |
624 | dev->init = sl_init; | |
625 | dev->uninit = sl_uninit; | |
626 | dev->open = sl_open; | |
627 | dev->destructor = free_netdev; | |
628 | dev->stop = sl_close; | |
629 | dev->get_stats = sl_get_stats; | |
630 | dev->change_mtu = sl_change_mtu; | |
631 | dev->hard_start_xmit = sl_xmit; | |
632 | #ifdef CONFIG_SLIP_SMART | |
633 | dev->do_ioctl = sl_ioctl; | |
634 | #endif | |
635 | dev->hard_header_len = 0; | |
636 | dev->addr_len = 0; | |
637 | dev->tx_queue_len = 10; | |
638 | ||
1da177e4 LT |
639 | /* New-style flags. */ |
640 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
641 | } | |
642 | ||
643 | /****************************************** | |
644 | Routines looking at TTY side. | |
645 | ******************************************/ | |
646 | ||
647 | ||
1da177e4 LT |
648 | /* |
649 | * Handle the 'receiver data ready' interrupt. | |
650 | * This function is called by the 'tty_io' module in the kernel when | |
651 | * a block of SLIP data has been received, which can now be decapsulated | |
652 | * and sent on to some IP layer for further processing. This will not | |
653 | * be re-entered while running but other ldisc functions may be called | |
654 | * in parallel | |
655 | */ | |
6aa20a22 | 656 | |
9ce6cf25 AC |
657 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
658 | char *fp, int count) | |
1da177e4 | 659 | { |
9ce6cf25 | 660 | struct slip *sl = tty->disc_data; |
1da177e4 | 661 | |
9ce6cf25 | 662 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 LT |
663 | return; |
664 | ||
665 | /* Read the characters out of the buffer */ | |
666 | while (count--) { | |
667 | if (fp && *fp++) { | |
9ce6cf25 | 668 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
1da177e4 | 669 | sl->rx_errors++; |
1da177e4 LT |
670 | cp++; |
671 | continue; | |
672 | } | |
673 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
674 | if (sl->mode & SL_MODE_SLIP6) | |
675 | slip_unesc6(sl, *cp++); | |
676 | else | |
677 | #endif | |
678 | slip_unesc(sl, *cp++); | |
679 | } | |
680 | } | |
681 | ||
682 | /************************************ | |
683 | * slip_open helper routines. | |
684 | ************************************/ | |
685 | ||
686 | /* Collect hanged up channels */ | |
1da177e4 LT |
687 | static void sl_sync(void) |
688 | { | |
689 | int i; | |
690 | struct net_device *dev; | |
691 | struct slip *sl; | |
692 | ||
693 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
694 | dev = slip_devs[i]; |
695 | if (dev == NULL) | |
1da177e4 LT |
696 | break; |
697 | ||
698 | sl = netdev_priv(dev); | |
699 | if (sl->tty || sl->leased) | |
700 | continue; | |
9ce6cf25 | 701 | if (dev->flags & IFF_UP) |
1da177e4 LT |
702 | dev_close(dev); |
703 | } | |
704 | } | |
705 | ||
706 | ||
707 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
9ce6cf25 | 708 | static struct slip *sl_alloc(dev_t line) |
1da177e4 LT |
709 | { |
710 | int i; | |
711 | int sel = -1; | |
712 | int score = -1; | |
713 | struct net_device *dev = NULL; | |
714 | struct slip *sl; | |
715 | ||
6aa20a22 | 716 | if (slip_devs == NULL) |
1da177e4 LT |
717 | return NULL; /* Master array missing ! */ |
718 | ||
719 | for (i = 0; i < slip_maxdev; i++) { | |
720 | dev = slip_devs[i]; | |
721 | if (dev == NULL) | |
722 | break; | |
723 | ||
724 | sl = netdev_priv(dev); | |
725 | if (sl->leased) { | |
726 | if (sl->line != line) | |
727 | continue; | |
728 | if (sl->tty) | |
729 | return NULL; | |
730 | ||
731 | /* Clear ESCAPE & ERROR flags */ | |
732 | sl->flags &= (1 << SLF_INUSE); | |
733 | return sl; | |
734 | } | |
735 | ||
736 | if (sl->tty) | |
737 | continue; | |
738 | ||
739 | if (current->pid == sl->pid) { | |
740 | if (sl->line == line && score < 3) { | |
741 | sel = i; | |
742 | score = 3; | |
743 | continue; | |
744 | } | |
745 | if (score < 2) { | |
746 | sel = i; | |
747 | score = 2; | |
748 | } | |
749 | continue; | |
750 | } | |
751 | if (sl->line == line && score < 1) { | |
752 | sel = i; | |
753 | score = 1; | |
754 | continue; | |
755 | } | |
756 | if (score < 0) { | |
757 | sel = i; | |
758 | score = 0; | |
759 | } | |
760 | } | |
761 | ||
762 | if (sel >= 0) { | |
763 | i = sel; | |
764 | dev = slip_devs[i]; | |
765 | if (score > 1) { | |
766 | sl = netdev_priv(dev); | |
767 | sl->flags &= (1 << SLF_INUSE); | |
768 | return sl; | |
769 | } | |
770 | } | |
771 | ||
772 | /* Sorry, too many, all slots in use */ | |
773 | if (i >= slip_maxdev) | |
774 | return NULL; | |
775 | ||
776 | if (dev) { | |
777 | sl = netdev_priv(dev); | |
778 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
779 | unregister_netdevice(dev); | |
780 | dev = NULL; | |
781 | slip_devs[i] = NULL; | |
782 | } | |
783 | } | |
6aa20a22 | 784 | |
1da177e4 LT |
785 | if (!dev) { |
786 | char name[IFNAMSIZ]; | |
787 | sprintf(name, "sl%d", i); | |
788 | ||
789 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
790 | if (!dev) | |
791 | return NULL; | |
792 | dev->base_addr = i; | |
793 | } | |
794 | ||
795 | sl = netdev_priv(dev); | |
796 | ||
797 | /* Initialize channel control data */ | |
798 | sl->magic = SLIP_MAGIC; | |
799 | sl->dev = dev; | |
800 | spin_lock_init(&sl->lock); | |
801 | sl->mode = SL_MODE_DEFAULT; | |
802 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
803 | /* initialize timer_list struct */ |
804 | init_timer(&sl->keepalive_timer); | |
805 | sl->keepalive_timer.data = (unsigned long)sl; | |
806 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 807 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
808 | sl->outfill_timer.data = (unsigned long)sl; |
809 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
810 | #endif |
811 | slip_devs[i] = dev; | |
1da177e4 LT |
812 | return sl; |
813 | } | |
814 | ||
815 | /* | |
816 | * Open the high-level part of the SLIP channel. | |
817 | * This function is called by the TTY module when the | |
818 | * SLIP line discipline is called for. Because we are | |
819 | * sure the tty line exists, we only have to link it to | |
820 | * a free SLIP channel... | |
821 | * | |
822 | * Called in process context serialized from other ldisc calls. | |
823 | */ | |
824 | ||
825 | static int slip_open(struct tty_struct *tty) | |
826 | { | |
827 | struct slip *sl; | |
828 | int err; | |
829 | ||
9ce6cf25 | 830 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 831 | return -EPERM; |
6aa20a22 | 832 | |
1da177e4 LT |
833 | /* RTnetlink lock is misused here to serialize concurrent |
834 | opens of slip channels. There are better ways, but it is | |
835 | the simplest one. | |
836 | */ | |
837 | rtnl_lock(); | |
838 | ||
839 | /* Collect hanged up channels. */ | |
840 | sl_sync(); | |
841 | ||
9ce6cf25 | 842 | sl = tty->disc_data; |
1da177e4 LT |
843 | |
844 | err = -EEXIST; | |
845 | /* First make sure we're not already connected. */ | |
846 | if (sl && sl->magic == SLIP_MAGIC) | |
847 | goto err_exit; | |
848 | ||
849 | /* OK. Find a free SLIP channel to use. */ | |
850 | err = -ENFILE; | |
9ce6cf25 AC |
851 | sl = sl_alloc(tty_devnum(tty)); |
852 | if (sl == NULL) | |
1da177e4 LT |
853 | goto err_exit; |
854 | ||
855 | sl->tty = tty; | |
856 | tty->disc_data = sl; | |
857 | sl->line = tty_devnum(tty); | |
858 | sl->pid = current->pid; | |
6aa20a22 | 859 | |
1da177e4 LT |
860 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
861 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
862 | err = sl_alloc_bufs(sl, SL_MTU); |
863 | if (err) | |
1da177e4 LT |
864 | goto err_free_chan; |
865 | ||
866 | set_bit(SLF_INUSE, &sl->flags); | |
867 | ||
9ce6cf25 AC |
868 | err = register_netdevice(sl->dev); |
869 | if (err) | |
1da177e4 LT |
870 | goto err_free_bufs; |
871 | } | |
872 | ||
873 | #ifdef CONFIG_SLIP_SMART | |
874 | if (sl->keepalive) { | |
9ce6cf25 AC |
875 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
876 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
877 | } |
878 | if (sl->outfill) { | |
9ce6cf25 AC |
879 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
880 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
881 | } |
882 | #endif | |
883 | ||
884 | /* Done. We have linked the TTY line to a channel. */ | |
885 | rtnl_unlock(); | |
33f0f88f | 886 | tty->receive_room = 65536; /* We don't flow control */ |
1da177e4 LT |
887 | return sl->dev->base_addr; |
888 | ||
889 | err_free_bufs: | |
890 | sl_free_bufs(sl); | |
891 | ||
892 | err_free_chan: | |
893 | sl->tty = NULL; | |
894 | tty->disc_data = NULL; | |
895 | clear_bit(SLF_INUSE, &sl->flags); | |
896 | ||
897 | err_exit: | |
898 | rtnl_unlock(); | |
899 | ||
900 | /* Count references from TTY module */ | |
901 | return err; | |
902 | } | |
903 | ||
904 | /* | |
905 | ||
906 | FIXME: 1,2 are fixed 3 was never true anyway. | |
6aa20a22 | 907 | |
1da177e4 LT |
908 | Let me to blame a bit. |
909 | 1. TTY module calls this funstion on soft interrupt. | |
910 | 2. TTY module calls this function WITH MASKED INTERRUPTS! | |
911 | 3. TTY module does not notify us about line discipline | |
912 | shutdown, | |
913 | ||
914 | Seems, now it is clean. The solution is to consider netdevice and | |
915 | line discipline sides as two independent threads. | |
916 | ||
917 | By-product (not desired): sl? does not feel hangups and remains open. | |
918 | It is supposed, that user level program (dip, diald, slattach...) | |
6aa20a22 | 919 | will catch SIGHUP and make the rest of work. |
1da177e4 LT |
920 | |
921 | I see no way to make more with current tty code. --ANK | |
922 | */ | |
923 | ||
924 | /* | |
925 | * Close down a SLIP channel. | |
926 | * This means flushing out any pending queues, and then returning. This | |
927 | * call is serialized against other ldisc functions. | |
928 | */ | |
9ce6cf25 | 929 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 930 | { |
9ce6cf25 | 931 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
932 | |
933 | /* First make sure we're connected. */ | |
934 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
935 | return; | |
936 | ||
937 | tty->disc_data = NULL; | |
938 | sl->tty = NULL; | |
939 | if (!sl->leased) | |
940 | sl->line = 0; | |
941 | ||
942 | /* VSV = very important to remove timers */ | |
943 | #ifdef CONFIG_SLIP_SMART | |
944 | del_timer_sync(&sl->keepalive_timer); | |
945 | del_timer_sync(&sl->outfill_timer); | |
946 | #endif | |
947 | ||
948 | /* Count references from TTY module */ | |
949 | } | |
950 | ||
951 | /************************************************************************ | |
952 | * STANDARD SLIP ENCAPSULATION * | |
953 | ************************************************************************/ | |
954 | ||
9ce6cf25 | 955 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
956 | { |
957 | unsigned char *ptr = d; | |
958 | unsigned char c; | |
959 | ||
960 | /* | |
961 | * Send an initial END character to flush out any | |
962 | * data that may have accumulated in the receiver | |
963 | * due to line noise. | |
964 | */ | |
965 | ||
966 | *ptr++ = END; | |
967 | ||
968 | /* | |
969 | * For each byte in the packet, send the appropriate | |
970 | * character sequence, according to the SLIP protocol. | |
971 | */ | |
972 | ||
973 | while (len-- > 0) { | |
9ce6cf25 AC |
974 | switch (c = *s++) { |
975 | case END: | |
1da177e4 LT |
976 | *ptr++ = ESC; |
977 | *ptr++ = ESC_END; | |
978 | break; | |
9ce6cf25 | 979 | case ESC: |
1da177e4 LT |
980 | *ptr++ = ESC; |
981 | *ptr++ = ESC_ESC; | |
982 | break; | |
9ce6cf25 | 983 | default: |
1da177e4 LT |
984 | *ptr++ = c; |
985 | break; | |
986 | } | |
987 | } | |
988 | *ptr++ = END; | |
989 | return (ptr - d); | |
990 | } | |
991 | ||
992 | static void slip_unesc(struct slip *sl, unsigned char s) | |
993 | { | |
994 | ||
9ce6cf25 AC |
995 | switch (s) { |
996 | case END: | |
1da177e4 LT |
997 | #ifdef CONFIG_SLIP_SMART |
998 | /* drop keeptest bit = VSV */ | |
999 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1000 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1001 | #endif | |
1002 | ||
9ce6cf25 AC |
1003 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) |
1004 | && (sl->rcount > 2)) | |
1da177e4 | 1005 | sl_bump(sl); |
1da177e4 LT |
1006 | clear_bit(SLF_ESCAPE, &sl->flags); |
1007 | sl->rcount = 0; | |
1008 | return; | |
1009 | ||
9ce6cf25 | 1010 | case ESC: |
1da177e4 LT |
1011 | set_bit(SLF_ESCAPE, &sl->flags); |
1012 | return; | |
9ce6cf25 AC |
1013 | case ESC_ESC: |
1014 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 1015 | s = ESC; |
1da177e4 | 1016 | break; |
9ce6cf25 AC |
1017 | case ESC_END: |
1018 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 1019 | s = END; |
1da177e4 LT |
1020 | break; |
1021 | } | |
1022 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1023 | if (sl->rcount < sl->buffsize) { | |
1024 | sl->rbuff[sl->rcount++] = s; | |
1025 | return; | |
1026 | } | |
1027 | sl->rx_over_errors++; | |
1028 | set_bit(SLF_ERROR, &sl->flags); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | ||
1033 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1034 | /************************************************************************ | |
1035 | * 6 BIT SLIP ENCAPSULATION * | |
1036 | ************************************************************************/ | |
1037 | ||
9ce6cf25 | 1038 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
1039 | { |
1040 | unsigned char *ptr = d; | |
1041 | unsigned char c; | |
1042 | int i; | |
1043 | unsigned short v = 0; | |
1044 | short bits = 0; | |
1045 | ||
1046 | /* | |
1047 | * Send an initial END character to flush out any | |
1048 | * data that may have accumulated in the receiver | |
1049 | * due to line noise. | |
1050 | */ | |
1051 | ||
1052 | *ptr++ = 0x70; | |
1053 | ||
1054 | /* | |
1055 | * Encode the packet into printable ascii characters | |
1056 | */ | |
1057 | ||
1058 | for (i = 0; i < len; ++i) { | |
1059 | v = (v << 8) | s[i]; | |
1060 | bits += 8; | |
1061 | while (bits >= 6) { | |
1062 | bits -= 6; | |
1063 | c = 0x30 + ((v >> bits) & 0x3F); | |
1064 | *ptr++ = c; | |
1065 | } | |
1066 | } | |
1067 | if (bits) { | |
1068 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1069 | *ptr++ = c; | |
1070 | } | |
1071 | *ptr++ = 0x70; | |
1072 | return ptr - d; | |
1073 | } | |
1074 | ||
9ce6cf25 | 1075 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1076 | { |
1077 | unsigned char c; | |
1078 | ||
1079 | if (s == 0x70) { | |
1080 | #ifdef CONFIG_SLIP_SMART | |
1081 | /* drop keeptest bit = VSV */ | |
1082 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1083 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1084 | #endif | |
1085 | ||
9ce6cf25 AC |
1086 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) |
1087 | && (sl->rcount > 2)) | |
1da177e4 | 1088 | sl_bump(sl); |
1da177e4 LT |
1089 | sl->rcount = 0; |
1090 | sl->xbits = 0; | |
1091 | sl->xdata = 0; | |
9ce6cf25 | 1092 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1093 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1094 | sl->xbits += 6; | |
1095 | if (sl->xbits >= 8) { | |
1096 | sl->xbits -= 8; | |
1097 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1098 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1099 | if (sl->rcount < sl->buffsize) { | |
1100 | sl->rbuff[sl->rcount++] = c; | |
1101 | return; | |
1102 | } | |
1103 | sl->rx_over_errors++; | |
1104 | set_bit(SLF_ERROR, &sl->flags); | |
1105 | } | |
1106 | } | |
9ce6cf25 | 1107 | } |
1da177e4 LT |
1108 | } |
1109 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1110 | ||
1111 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1112 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1113 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1114 | { |
9ce6cf25 | 1115 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1116 | unsigned int tmp; |
1117 | int __user *p = (int __user *)arg; | |
1118 | ||
1119 | /* First make sure we're connected. */ | |
9ce6cf25 | 1120 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1121 | return -EINVAL; |
1da177e4 | 1122 | |
9ce6cf25 AC |
1123 | switch (cmd) { |
1124 | case SIOCGIFNAME: | |
1da177e4 LT |
1125 | tmp = strlen(sl->dev->name) + 1; |
1126 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1127 | return -EFAULT; | |
1128 | return 0; | |
1129 | ||
1130 | case SIOCGIFENCAP: | |
1131 | if (put_user(sl->mode, p)) | |
1132 | return -EFAULT; | |
1133 | return 0; | |
1134 | ||
1135 | case SIOCSIFENCAP: | |
1136 | if (get_user(tmp, p)) | |
1137 | return -EFAULT; | |
1138 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1139 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1140 | return -EINVAL; |
1da177e4 LT |
1141 | #else |
1142 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1143 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1144 | /* return -EINVAL; */ |
1145 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1146 | #endif |
1147 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1148 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1149 | return -EINVAL; |
1da177e4 LT |
1150 | #endif |
1151 | sl->mode = tmp; | |
9ce6cf25 | 1152 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1153 | return 0; |
1154 | ||
9ce6cf25 | 1155 | case SIOCSIFHWADDR: |
1da177e4 LT |
1156 | return -EINVAL; |
1157 | ||
1158 | #ifdef CONFIG_SLIP_SMART | |
1159 | /* VSV changes start here */ | |
9ce6cf25 | 1160 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1161 | if (get_user(tmp, p)) |
1162 | return -EFAULT; | |
9ce6cf25 | 1163 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1164 | return -EINVAL; |
1165 | ||
1166 | spin_lock_bh(&sl->lock); | |
1167 | if (!sl->tty) { | |
1168 | spin_unlock_bh(&sl->lock); | |
1169 | return -ENODEV; | |
1170 | } | |
9ce6cf25 AC |
1171 | sl->keepalive = (u8)tmp; |
1172 | if (sl->keepalive != 0) { | |
1173 | mod_timer(&sl->keepalive_timer, | |
1174 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1175 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1176 | } else |
1177 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1178 | spin_unlock_bh(&sl->lock); |
1179 | return 0; | |
1180 | ||
9ce6cf25 | 1181 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1182 | if (put_user(sl->keepalive, p)) |
1183 | return -EFAULT; | |
1184 | return 0; | |
1185 | ||
9ce6cf25 | 1186 | case SIOCSOUTFILL: |
1da177e4 LT |
1187 | if (get_user(tmp, p)) |
1188 | return -EFAULT; | |
9ce6cf25 | 1189 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1190 | return -EINVAL; |
1191 | spin_lock_bh(&sl->lock); | |
1192 | if (!sl->tty) { | |
1193 | spin_unlock_bh(&sl->lock); | |
1194 | return -ENODEV; | |
1195 | } | |
9ce6cf25 AC |
1196 | sl->outfill = (u8)tmp; |
1197 | if (sl->outfill != 0) { | |
1198 | mod_timer(&sl->outfill_timer, | |
1199 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1200 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1201 | } else |
1202 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1203 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1204 | return 0; |
1da177e4 | 1205 | |
9ce6cf25 | 1206 | case SIOCGOUTFILL: |
1da177e4 LT |
1207 | if (put_user(sl->outfill, p)) |
1208 | return -EFAULT; | |
1209 | return 0; | |
1210 | /* VSV changes end */ | |
1211 | #endif | |
1da177e4 | 1212 | default: |
d0127539 | 1213 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1214 | } |
1215 | } | |
1216 | ||
1217 | /* VSV changes start here */ | |
1218 | #ifdef CONFIG_SLIP_SMART | |
1219 | /* function do_ioctl called from net/core/dev.c | |
1220 | to allow get/set outfill/keepalive parameter | |
1221 | by ifconfig */ | |
1222 | ||
9ce6cf25 | 1223 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1224 | { |
1225 | struct slip *sl = netdev_priv(dev); | |
1226 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1227 | ||
1228 | if (sl == NULL) /* Allocation failed ?? */ | |
1229 | return -ENODEV; | |
1230 | ||
1231 | spin_lock_bh(&sl->lock); | |
1232 | ||
1233 | if (!sl->tty) { | |
1234 | spin_unlock_bh(&sl->lock); | |
1235 | return -ENODEV; | |
1236 | } | |
1237 | ||
9ce6cf25 AC |
1238 | switch (cmd) { |
1239 | case SIOCSKEEPALIVE: | |
1da177e4 | 1240 | /* max for unchar */ |
9ce6cf25 | 1241 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1242 | spin_unlock_bh(&sl->lock); |
1243 | return -EINVAL; | |
1244 | } | |
9ce6cf25 | 1245 | sl->keepalive = (u8)*p; |
1da177e4 | 1246 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1247 | sl->keepalive_timer.expires = |
1248 | jiffies + sl->keepalive * HZ; | |
1249 | mod_timer(&sl->keepalive_timer, | |
1250 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1251 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1252 | } else |
1253 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1254 | break; |
1255 | ||
9ce6cf25 | 1256 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1257 | *p = sl->keepalive; |
1258 | break; | |
1259 | ||
9ce6cf25 AC |
1260 | case SIOCSOUTFILL: |
1261 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1262 | spin_unlock_bh(&sl->lock); |
1263 | return -EINVAL; | |
1264 | } | |
9ce6cf25 AC |
1265 | sl->outfill = (u8)*p; |
1266 | if (sl->outfill != 0) { | |
1267 | mod_timer(&sl->outfill_timer, | |
1268 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1269 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1270 | } else |
1271 | del_timer(&sl->outfill_timer); | |
1272 | break; | |
1da177e4 | 1273 | |
9ce6cf25 | 1274 | case SIOCGOUTFILL: |
1da177e4 LT |
1275 | *p = sl->outfill; |
1276 | break; | |
1277 | ||
9ce6cf25 | 1278 | case SIOCSLEASE: |
6aa20a22 | 1279 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1280 | and opened by another process device. |
1281 | */ | |
9ce6cf25 AC |
1282 | if (sl->tty != current->signal->tty && |
1283 | sl->pid != current->pid) { | |
1da177e4 LT |
1284 | spin_unlock_bh(&sl->lock); |
1285 | return -EPERM; | |
1286 | } | |
1287 | sl->leased = 0; | |
9ce6cf25 | 1288 | if (*p) |
1da177e4 | 1289 | sl->leased = 1; |
9ce6cf25 | 1290 | break; |
1da177e4 | 1291 | |
9ce6cf25 | 1292 | case SIOCGLEASE: |
1da177e4 LT |
1293 | *p = sl->leased; |
1294 | }; | |
1295 | spin_unlock_bh(&sl->lock); | |
1296 | return 0; | |
1297 | } | |
1298 | #endif | |
1299 | /* VSV changes end */ | |
1300 | ||
1301 | static struct tty_ldisc sl_ldisc = { | |
1302 | .owner = THIS_MODULE, | |
1303 | .magic = TTY_LDISC_MAGIC, | |
1304 | .name = "slip", | |
1305 | .open = slip_open, | |
1306 | .close = slip_close, | |
1307 | .ioctl = slip_ioctl, | |
1308 | .receive_buf = slip_receive_buf, | |
1da177e4 LT |
1309 | .write_wakeup = slip_write_wakeup, |
1310 | }; | |
1311 | ||
1312 | static int __init slip_init(void) | |
1313 | { | |
1314 | int status; | |
1315 | ||
1316 | if (slip_maxdev < 4) | |
1317 | slip_maxdev = 4; /* Sanity */ | |
1318 | ||
1319 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1320 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1321 | " (6 bit encapsulation enabled)" | |
1322 | #endif | |
1323 | ".\n", | |
9ce6cf25 | 1324 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1325 | #if defined(SL_INCLUDE_CSLIP) |
1326 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1327 | #endif | |
1328 | #ifdef CONFIG_SLIP_SMART | |
1329 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1330 | #endif | |
1331 | ||
9ce6cf25 AC |
1332 | slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev, |
1333 | GFP_KERNEL); | |
1da177e4 | 1334 | if (!slip_devs) { |
9ce6cf25 | 1335 | printk(KERN_ERR "SLIP: Can't allocate slip devices array.\n"); |
1da177e4 LT |
1336 | return -ENOMEM; |
1337 | } | |
1338 | ||
1da177e4 | 1339 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1340 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1341 | if (status != 0) { | |
1da177e4 LT |
1342 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1343 | kfree(slip_devs); | |
1344 | } | |
1345 | return status; | |
1346 | } | |
1347 | ||
1348 | static void __exit slip_exit(void) | |
1349 | { | |
1350 | int i; | |
1351 | struct net_device *dev; | |
1352 | struct slip *sl; | |
1353 | unsigned long timeout = jiffies + HZ; | |
1354 | int busy = 0; | |
1355 | ||
6aa20a22 | 1356 | if (slip_devs == NULL) |
1da177e4 LT |
1357 | return; |
1358 | ||
1359 | /* First of all: check for active disciplines and hangup them. | |
1360 | */ | |
1361 | do { | |
a9fc2510 NA |
1362 | if (busy) |
1363 | msleep_interruptible(100); | |
1da177e4 LT |
1364 | |
1365 | busy = 0; | |
1366 | for (i = 0; i < slip_maxdev; i++) { | |
1367 | dev = slip_devs[i]; | |
1368 | if (!dev) | |
1369 | continue; | |
1370 | sl = netdev_priv(dev); | |
1371 | spin_lock_bh(&sl->lock); | |
1372 | if (sl->tty) { | |
1373 | busy++; | |
1374 | tty_hangup(sl->tty); | |
1375 | } | |
1376 | spin_unlock_bh(&sl->lock); | |
1377 | } | |
1378 | } while (busy && time_before(jiffies, timeout)); | |
1379 | ||
1380 | ||
1381 | for (i = 0; i < slip_maxdev; i++) { | |
1382 | dev = slip_devs[i]; | |
1383 | if (!dev) | |
1384 | continue; | |
1385 | slip_devs[i] = NULL; | |
1386 | ||
1387 | sl = netdev_priv(dev); | |
1388 | if (sl->tty) { | |
1389 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1390 | dev->name); | |
1391 | /* Intentionally leak the control block. */ | |
1392 | dev->destructor = NULL; | |
6aa20a22 | 1393 | } |
1da177e4 LT |
1394 | |
1395 | unregister_netdev(dev); | |
1396 | } | |
1397 | ||
1398 | kfree(slip_devs); | |
1399 | slip_devs = NULL; | |
1400 | ||
9ce6cf25 AC |
1401 | i = tty_unregister_ldisc(N_SLIP); |
1402 | if (i != 0) | |
1da177e4 | 1403 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1404 | } |
1405 | ||
1406 | module_init(slip_init); | |
1407 | module_exit(slip_exit); | |
1408 | ||
1409 | #ifdef CONFIG_SLIP_SMART | |
1410 | /* | |
1411 | * This is start of the code for multislip style line checking | |
1412 | * added by Stanislav Voronyi. All changes before marked VSV | |
1413 | */ | |
1414 | ||
1415 | static void sl_outfill(unsigned long sls) | |
1416 | { | |
9ce6cf25 | 1417 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1418 | |
1419 | spin_lock(&sl->lock); | |
1420 | ||
1421 | if (sl->tty == NULL) | |
1422 | goto out; | |
1423 | ||
9ce6cf25 AC |
1424 | if (sl->outfill) { |
1425 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1426 | /* no packets were transmitted, do outfill */ |
1427 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1428 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1429 | #else | |
1430 | unsigned char s = END; | |
1431 | #endif | |
1432 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1433 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 LT |
1434 | /* if device busy no outfill */ |
1435 | sl->tty->driver->write(sl->tty, &s, 1); | |
1436 | } | |
9ce6cf25 | 1437 | } else |
1da177e4 LT |
1438 | set_bit(SLF_OUTWAIT, &sl->flags); |
1439 | ||
1440 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1441 | } | |
1442 | out: | |
1443 | spin_unlock(&sl->lock); | |
1444 | } | |
1445 | ||
1446 | static void sl_keepalive(unsigned long sls) | |
1447 | { | |
9ce6cf25 | 1448 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1449 | |
1450 | spin_lock(&sl->lock); | |
1451 | ||
1452 | if (sl->tty == NULL) | |
1453 | goto out; | |
1454 | ||
9ce6cf25 AC |
1455 | if (sl->keepalive) { |
1456 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1457 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1458 | if (sl->outfill) |
1459 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1460 | (void)del_timer(&sl->outfill_timer); |
1461 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1462 | /* this must hangup tty & close slip */ |
1463 | tty_hangup(sl->tty); | |
1da177e4 LT |
1464 | /* I think we need not something else */ |
1465 | goto out; | |
9ce6cf25 | 1466 | } else |
1da177e4 LT |
1467 | set_bit(SLF_KEEPTEST, &sl->flags); |
1468 | ||
1469 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1470 | } | |
1da177e4 LT |
1471 | out: |
1472 | spin_unlock(&sl->lock); | |
1473 | } | |
1474 | ||
1475 | #endif | |
1476 | MODULE_LICENSE("GPL"); | |
1477 | MODULE_ALIAS_LDISC(N_SLIP); |