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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * slip.c This module implements the SLIP protocol for kernel-based | |
3 | * devices like TTY. It interfaces between a raw TTY, and the | |
4 | * kernel's INET protocol layers. | |
5 | * | |
6 | * Version: @(#)slip.c 0.8.3 12/24/94 | |
7 | * | |
8 | * Authors: Laurence Culhane, <loz@holmes.demon.co.uk> | |
9 | * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> | |
10 | * | |
11 | * Fixes: | |
12 | * Alan Cox : Sanity checks and avoid tx overruns. | |
13 | * Has a new sl->mtu field. | |
9ce6cf25 AC |
14 | * Alan Cox : Found cause of overrun. ifconfig sl0 |
15 | * mtu upwards. Driver now spots this | |
16 | * and grows/shrinks its buffers(hack!). | |
17 | * Memory leak if you run out of memory | |
18 | * setting up a slip driver fixed. | |
1da177e4 LT |
19 | * Matt Dillon : Printable slip (borrowed from NET2E) |
20 | * Pauline Middelink : Slip driver fixes. | |
21 | * Alan Cox : Honours the old SL_COMPRESSED flag | |
22 | * Alan Cox : KISS AX.25 and AXUI IP support | |
23 | * Michael Riepe : Automatic CSLIP recognition added | |
24 | * Charles Hedrick : CSLIP header length problem fix. | |
25 | * Alan Cox : Corrected non-IP cases of the above. | |
26 | * Alan Cox : Now uses hardware type as per FvK. | |
27 | * Alan Cox : Default to 192.168.0.0 (RFC 1597) | |
28 | * A.N.Kuznetsov : dev_tint() recursion fix. | |
29 | * Dmitry Gorodchanin : SLIP memory leaks | |
30 | * Dmitry Gorodchanin : Code cleanup. Reduce tty driver | |
31 | * buffering from 4096 to 256 bytes. | |
32 | * Improving SLIP response time. | |
33 | * CONFIG_SLIP_MODE_SLIP6. | |
9ce6cf25 AC |
34 | * ifconfig sl? up & down now works |
35 | * correctly. | |
1da177e4 LT |
36 | * Modularization. |
37 | * Alan Cox : Oops - fix AX.25 buffer lengths | |
38 | * Dmitry Gorodchanin : Even more cleanups. Preserve CSLIP | |
39 | * statistics. Include CSLIP code only | |
40 | * if it really needed. | |
41 | * Alan Cox : Free slhc buffers in the right place. | |
42 | * Alan Cox : Allow for digipeated IP over AX.25 | |
43 | * Matti Aarnio : Dynamic SLIP devices, with ideas taken | |
44 | * from Jim Freeman's <jfree@caldera.com> | |
45 | * dynamic PPP devices. We do NOT kfree() | |
46 | * device entries, just reg./unreg. them | |
47 | * as they are needed. We kfree() them | |
48 | * at module cleanup. | |
9ce6cf25 AC |
49 | * With MODULE-loading ``insmod'', user |
50 | * can issue parameter: slip_maxdev=1024 | |
51 | * (Or how much he/she wants.. Default | |
52 | * is 256) | |
53 | * Stanislav Voronyi : Slip line checking, with ideas taken | |
54 | * from multislip BSDI driver which was | |
55 | * written by Igor Chechik, RELCOM Corp. | |
56 | * Only algorithms have been ported to | |
57 | * Linux SLIP driver. | |
1da177e4 | 58 | * Vitaly E. Lavrov : Sane behaviour on tty hangup. |
9ce6cf25 AC |
59 | * Alexey Kuznetsov : Cleanup interfaces to tty & netdevice |
60 | * modules. | |
1da177e4 LT |
61 | */ |
62 | ||
63 | #define SL_CHECK_TRANSMIT | |
1da177e4 LT |
64 | #include <linux/module.h> |
65 | #include <linux/moduleparam.h> | |
66 | ||
67 | #include <asm/system.h> | |
68 | #include <asm/uaccess.h> | |
69 | #include <linux/bitops.h> | |
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 | 367 | netif_rx(skb); |
1da177e4 LT |
368 | sl->rx_packets++; |
369 | } | |
370 | ||
371 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ | |
9ce6cf25 | 372 | static void sl_encaps(struct slip *sl, unsigned char *icp, int len) |
1da177e4 LT |
373 | { |
374 | unsigned char *p; | |
375 | int actual, count; | |
376 | ||
377 | if (len > sl->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
378 | printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name); | |
379 | sl->tx_dropped++; | |
380 | sl_unlock(sl); | |
381 | return; | |
382 | } | |
383 | ||
384 | p = icp; | |
385 | #ifdef SL_INCLUDE_CSLIP | |
9ce6cf25 | 386 | if (sl->mode & SL_MODE_CSLIP) |
1da177e4 | 387 | len = slhc_compress(sl->slcomp, p, len, sl->cbuff, &p, 1); |
1da177e4 LT |
388 | #endif |
389 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 390 | if (sl->mode & SL_MODE_SLIP6) |
1da177e4 LT |
391 | count = slip_esc6(p, (unsigned char *) sl->xbuff, len); |
392 | else | |
393 | #endif | |
394 | count = slip_esc(p, (unsigned char *) sl->xbuff, len); | |
395 | ||
396 | /* Order of next two lines is *very* important. | |
397 | * When we are sending a little amount of data, | |
f34d7a5b | 398 | * the transfer may be completed inside the ops->write() |
1da177e4 LT |
399 | * routine, because it's running with interrupts enabled. |
400 | * In this case we *never* got WRITE_WAKEUP event, | |
401 | * if we did not request it before write operation. | |
402 | * 14 Oct 1994 Dmitry Gorodchanin. | |
403 | */ | |
404 | sl->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); | |
f34d7a5b | 405 | actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
1da177e4 LT |
406 | #ifdef SL_CHECK_TRANSMIT |
407 | sl->dev->trans_start = jiffies; | |
408 | #endif | |
409 | sl->xleft = count - actual; | |
410 | sl->xhead = sl->xbuff + actual; | |
411 | #ifdef CONFIG_SLIP_SMART | |
412 | /* VSV */ | |
413 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ | |
414 | #endif | |
415 | } | |
416 | ||
417 | /* | |
418 | * Called by the driver when there's room for more data. If we have | |
419 | * more packets to send, we send them here. | |
420 | */ | |
421 | static void slip_write_wakeup(struct tty_struct *tty) | |
422 | { | |
423 | int actual; | |
9ce6cf25 | 424 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
425 | |
426 | /* First make sure we're connected. */ | |
9ce6cf25 | 427 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 | 428 | return; |
9ce6cf25 | 429 | |
1da177e4 LT |
430 | if (sl->xleft <= 0) { |
431 | /* Now serial buffer is almost free & we can start | |
432 | * transmission of another packet */ | |
433 | sl->tx_packets++; | |
434 | tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
435 | sl_unlock(sl); | |
436 | return; | |
437 | } | |
438 | ||
f34d7a5b | 439 | actual = tty->ops->write(tty, sl->xhead, sl->xleft); |
1da177e4 LT |
440 | sl->xleft -= actual; |
441 | sl->xhead += actual; | |
442 | } | |
443 | ||
444 | static void sl_tx_timeout(struct net_device *dev) | |
445 | { | |
446 | struct slip *sl = netdev_priv(dev); | |
447 | ||
448 | spin_lock(&sl->lock); | |
449 | ||
450 | if (netif_queue_stopped(dev)) { | |
451 | if (!netif_running(dev)) | |
452 | goto out; | |
453 | ||
454 | /* May be we must check transmitter timeout here ? | |
455 | * 14 Oct 1994 Dmitry Gorodchanin. | |
456 | */ | |
457 | #ifdef SL_CHECK_TRANSMIT | |
458 | if (time_before(jiffies, dev->trans_start + 20 * HZ)) { | |
459 | /* 20 sec timeout not reached */ | |
460 | goto out; | |
461 | } | |
9ce6cf25 AC |
462 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", |
463 | dev->name, | |
f34d7a5b | 464 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
9ce6cf25 | 465 | "bad line quality" : "driver error"); |
1da177e4 LT |
466 | sl->xleft = 0; |
467 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
468 | sl_unlock(sl); | |
469 | #endif | |
470 | } | |
1da177e4 LT |
471 | out: |
472 | spin_unlock(&sl->lock); | |
473 | } | |
474 | ||
475 | ||
476 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ | |
477 | static int | |
478 | sl_xmit(struct sk_buff *skb, struct net_device *dev) | |
479 | { | |
480 | struct slip *sl = netdev_priv(dev); | |
481 | ||
482 | spin_lock(&sl->lock); | |
9ce6cf25 | 483 | if (!netif_running(dev)) { |
1da177e4 LT |
484 | spin_unlock(&sl->lock); |
485 | printk(KERN_WARNING "%s: xmit call when iface is down\n", dev->name); | |
486 | dev_kfree_skb(skb); | |
487 | return 0; | |
488 | } | |
489 | if (sl->tty == NULL) { | |
490 | spin_unlock(&sl->lock); | |
491 | dev_kfree_skb(skb); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | sl_lock(sl); | |
9ce6cf25 | 496 | sl->tx_bytes += skb->len; |
1da177e4 LT |
497 | sl_encaps(sl, skb->data, skb->len); |
498 | spin_unlock(&sl->lock); | |
499 | ||
500 | dev_kfree_skb(skb); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | ||
505 | /****************************************** | |
506 | * Routines looking at netdevice side. | |
507 | ******************************************/ | |
508 | ||
509 | /* Netdevice UP -> DOWN routine */ | |
510 | ||
511 | static int | |
512 | sl_close(struct net_device *dev) | |
513 | { | |
514 | struct slip *sl = netdev_priv(dev); | |
515 | ||
516 | spin_lock_bh(&sl->lock); | |
517 | if (sl->tty) { | |
518 | /* TTY discipline is running. */ | |
519 | sl->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); | |
520 | } | |
521 | netif_stop_queue(dev); | |
522 | sl->rcount = 0; | |
523 | sl->xleft = 0; | |
524 | spin_unlock_bh(&sl->lock); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | /* Netdevice DOWN -> UP routine */ | |
530 | ||
531 | static int sl_open(struct net_device *dev) | |
532 | { | |
533 | struct slip *sl = netdev_priv(dev); | |
534 | ||
9ce6cf25 | 535 | if (sl->tty == NULL) |
1da177e4 LT |
536 | return -ENODEV; |
537 | ||
538 | sl->flags &= (1 << SLF_INUSE); | |
539 | netif_start_queue(dev); | |
540 | return 0; | |
541 | } | |
542 | ||
543 | /* Netdevice change MTU request */ | |
544 | ||
545 | static int sl_change_mtu(struct net_device *dev, int new_mtu) | |
546 | { | |
547 | struct slip *sl = netdev_priv(dev); | |
548 | ||
549 | if (new_mtu < 68 || new_mtu > 65534) | |
550 | return -EINVAL; | |
551 | ||
552 | if (new_mtu != dev->mtu) | |
553 | return sl_realloc_bufs(sl, new_mtu); | |
554 | return 0; | |
555 | } | |
556 | ||
557 | /* Netdevice get statistics request */ | |
558 | ||
559 | static struct net_device_stats * | |
560 | sl_get_stats(struct net_device *dev) | |
561 | { | |
562 | static struct net_device_stats stats; | |
563 | struct slip *sl = netdev_priv(dev); | |
564 | #ifdef SL_INCLUDE_CSLIP | |
565 | struct slcompress *comp; | |
566 | #endif | |
567 | ||
568 | memset(&stats, 0, sizeof(struct net_device_stats)); | |
569 | ||
570 | stats.rx_packets = sl->rx_packets; | |
571 | stats.tx_packets = sl->tx_packets; | |
572 | stats.rx_bytes = sl->rx_bytes; | |
573 | stats.tx_bytes = sl->tx_bytes; | |
574 | stats.rx_dropped = sl->rx_dropped; | |
575 | stats.tx_dropped = sl->tx_dropped; | |
576 | stats.tx_errors = sl->tx_errors; | |
577 | stats.rx_errors = sl->rx_errors; | |
578 | stats.rx_over_errors = sl->rx_over_errors; | |
579 | #ifdef SL_INCLUDE_CSLIP | |
580 | stats.rx_fifo_errors = sl->rx_compressed; | |
581 | stats.tx_fifo_errors = sl->tx_compressed; | |
582 | stats.collisions = sl->tx_misses; | |
583 | comp = sl->slcomp; | |
584 | if (comp) { | |
585 | stats.rx_fifo_errors += comp->sls_i_compressed; | |
586 | stats.rx_dropped += comp->sls_i_tossed; | |
587 | stats.tx_fifo_errors += comp->sls_o_compressed; | |
588 | stats.collisions += comp->sls_o_misses; | |
589 | } | |
590 | #endif /* CONFIG_INET */ | |
591 | return (&stats); | |
592 | } | |
593 | ||
594 | /* Netdevice register callback */ | |
595 | ||
596 | static int sl_init(struct net_device *dev) | |
597 | { | |
598 | struct slip *sl = netdev_priv(dev); | |
599 | ||
600 | /* | |
6aa20a22 | 601 | * Finish setting up the DEVICE info. |
1da177e4 LT |
602 | */ |
603 | ||
604 | dev->mtu = sl->mtu; | |
605 | dev->type = ARPHRD_SLIP + sl->mode; | |
606 | #ifdef SL_CHECK_TRANSMIT | |
607 | dev->tx_timeout = sl_tx_timeout; | |
608 | dev->watchdog_timeo = 20*HZ; | |
609 | #endif | |
610 | return 0; | |
611 | } | |
612 | ||
613 | ||
614 | static void sl_uninit(struct net_device *dev) | |
615 | { | |
616 | struct slip *sl = netdev_priv(dev); | |
617 | ||
618 | sl_free_bufs(sl); | |
619 | } | |
620 | ||
621 | static void sl_setup(struct net_device *dev) | |
622 | { | |
623 | dev->init = sl_init; | |
624 | dev->uninit = sl_uninit; | |
625 | dev->open = sl_open; | |
626 | dev->destructor = free_netdev; | |
627 | dev->stop = sl_close; | |
628 | dev->get_stats = sl_get_stats; | |
629 | dev->change_mtu = sl_change_mtu; | |
630 | dev->hard_start_xmit = sl_xmit; | |
631 | #ifdef CONFIG_SLIP_SMART | |
632 | dev->do_ioctl = sl_ioctl; | |
633 | #endif | |
634 | dev->hard_header_len = 0; | |
635 | dev->addr_len = 0; | |
636 | dev->tx_queue_len = 10; | |
637 | ||
1da177e4 LT |
638 | /* New-style flags. */ |
639 | dev->flags = IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST; | |
640 | } | |
641 | ||
642 | /****************************************** | |
643 | Routines looking at TTY side. | |
644 | ******************************************/ | |
645 | ||
646 | ||
1da177e4 LT |
647 | /* |
648 | * Handle the 'receiver data ready' interrupt. | |
649 | * This function is called by the 'tty_io' module in the kernel when | |
650 | * a block of SLIP data has been received, which can now be decapsulated | |
651 | * and sent on to some IP layer for further processing. This will not | |
652 | * be re-entered while running but other ldisc functions may be called | |
653 | * in parallel | |
654 | */ | |
6aa20a22 | 655 | |
9ce6cf25 AC |
656 | static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
657 | char *fp, int count) | |
1da177e4 | 658 | { |
9ce6cf25 | 659 | struct slip *sl = tty->disc_data; |
1da177e4 | 660 | |
9ce6cf25 | 661 | if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) |
1da177e4 LT |
662 | return; |
663 | ||
664 | /* Read the characters out of the buffer */ | |
665 | while (count--) { | |
666 | if (fp && *fp++) { | |
9ce6cf25 | 667 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
1da177e4 | 668 | sl->rx_errors++; |
1da177e4 LT |
669 | cp++; |
670 | continue; | |
671 | } | |
672 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
673 | if (sl->mode & SL_MODE_SLIP6) | |
674 | slip_unesc6(sl, *cp++); | |
675 | else | |
676 | #endif | |
677 | slip_unesc(sl, *cp++); | |
678 | } | |
679 | } | |
680 | ||
681 | /************************************ | |
682 | * slip_open helper routines. | |
683 | ************************************/ | |
684 | ||
685 | /* Collect hanged up channels */ | |
1da177e4 LT |
686 | static void sl_sync(void) |
687 | { | |
688 | int i; | |
689 | struct net_device *dev; | |
690 | struct slip *sl; | |
691 | ||
692 | for (i = 0; i < slip_maxdev; i++) { | |
9ce6cf25 AC |
693 | dev = slip_devs[i]; |
694 | if (dev == NULL) | |
1da177e4 LT |
695 | break; |
696 | ||
697 | sl = netdev_priv(dev); | |
698 | if (sl->tty || sl->leased) | |
699 | continue; | |
9ce6cf25 | 700 | if (dev->flags & IFF_UP) |
1da177e4 LT |
701 | dev_close(dev); |
702 | } | |
703 | } | |
704 | ||
705 | ||
706 | /* Find a free SLIP channel, and link in this `tty' line. */ | |
9ce6cf25 | 707 | static struct slip *sl_alloc(dev_t line) |
1da177e4 LT |
708 | { |
709 | int i; | |
710 | int sel = -1; | |
711 | int score = -1; | |
712 | struct net_device *dev = NULL; | |
713 | struct slip *sl; | |
714 | ||
6aa20a22 | 715 | if (slip_devs == NULL) |
1da177e4 LT |
716 | return NULL; /* Master array missing ! */ |
717 | ||
718 | for (i = 0; i < slip_maxdev; i++) { | |
719 | dev = slip_devs[i]; | |
720 | if (dev == NULL) | |
721 | break; | |
722 | ||
723 | sl = netdev_priv(dev); | |
724 | if (sl->leased) { | |
725 | if (sl->line != line) | |
726 | continue; | |
727 | if (sl->tty) | |
728 | return NULL; | |
729 | ||
730 | /* Clear ESCAPE & ERROR flags */ | |
731 | sl->flags &= (1 << SLF_INUSE); | |
732 | return sl; | |
733 | } | |
734 | ||
735 | if (sl->tty) | |
736 | continue; | |
737 | ||
738 | if (current->pid == sl->pid) { | |
739 | if (sl->line == line && score < 3) { | |
740 | sel = i; | |
741 | score = 3; | |
742 | continue; | |
743 | } | |
744 | if (score < 2) { | |
745 | sel = i; | |
746 | score = 2; | |
747 | } | |
748 | continue; | |
749 | } | |
750 | if (sl->line == line && score < 1) { | |
751 | sel = i; | |
752 | score = 1; | |
753 | continue; | |
754 | } | |
755 | if (score < 0) { | |
756 | sel = i; | |
757 | score = 0; | |
758 | } | |
759 | } | |
760 | ||
761 | if (sel >= 0) { | |
762 | i = sel; | |
763 | dev = slip_devs[i]; | |
764 | if (score > 1) { | |
765 | sl = netdev_priv(dev); | |
766 | sl->flags &= (1 << SLF_INUSE); | |
767 | return sl; | |
768 | } | |
769 | } | |
770 | ||
771 | /* Sorry, too many, all slots in use */ | |
772 | if (i >= slip_maxdev) | |
773 | return NULL; | |
774 | ||
775 | if (dev) { | |
776 | sl = netdev_priv(dev); | |
777 | if (test_bit(SLF_INUSE, &sl->flags)) { | |
778 | unregister_netdevice(dev); | |
779 | dev = NULL; | |
780 | slip_devs[i] = NULL; | |
781 | } | |
782 | } | |
6aa20a22 | 783 | |
1da177e4 LT |
784 | if (!dev) { |
785 | char name[IFNAMSIZ]; | |
786 | sprintf(name, "sl%d", i); | |
787 | ||
788 | dev = alloc_netdev(sizeof(*sl), name, sl_setup); | |
789 | if (!dev) | |
790 | return NULL; | |
791 | dev->base_addr = i; | |
792 | } | |
793 | ||
794 | sl = netdev_priv(dev); | |
795 | ||
796 | /* Initialize channel control data */ | |
797 | sl->magic = SLIP_MAGIC; | |
798 | sl->dev = dev; | |
799 | spin_lock_init(&sl->lock); | |
800 | sl->mode = SL_MODE_DEFAULT; | |
801 | #ifdef CONFIG_SLIP_SMART | |
9ce6cf25 AC |
802 | /* initialize timer_list struct */ |
803 | init_timer(&sl->keepalive_timer); | |
804 | sl->keepalive_timer.data = (unsigned long)sl; | |
805 | sl->keepalive_timer.function = sl_keepalive; | |
1da177e4 | 806 | init_timer(&sl->outfill_timer); |
9ce6cf25 AC |
807 | sl->outfill_timer.data = (unsigned long)sl; |
808 | sl->outfill_timer.function = sl_outfill; | |
1da177e4 LT |
809 | #endif |
810 | slip_devs[i] = dev; | |
1da177e4 LT |
811 | return sl; |
812 | } | |
813 | ||
814 | /* | |
815 | * Open the high-level part of the SLIP channel. | |
816 | * This function is called by the TTY module when the | |
817 | * SLIP line discipline is called for. Because we are | |
818 | * sure the tty line exists, we only have to link it to | |
819 | * a free SLIP channel... | |
820 | * | |
821 | * Called in process context serialized from other ldisc calls. | |
822 | */ | |
823 | ||
824 | static int slip_open(struct tty_struct *tty) | |
825 | { | |
826 | struct slip *sl; | |
827 | int err; | |
828 | ||
9ce6cf25 | 829 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 | 830 | return -EPERM; |
6aa20a22 | 831 | |
f34d7a5b AC |
832 | if (tty->ops->write == NULL) |
833 | return -EOPNOTSUPP; | |
834 | ||
1da177e4 LT |
835 | /* RTnetlink lock is misused here to serialize concurrent |
836 | opens of slip channels. There are better ways, but it is | |
837 | the simplest one. | |
838 | */ | |
839 | rtnl_lock(); | |
840 | ||
841 | /* Collect hanged up channels. */ | |
842 | sl_sync(); | |
843 | ||
9ce6cf25 | 844 | sl = tty->disc_data; |
1da177e4 LT |
845 | |
846 | err = -EEXIST; | |
847 | /* First make sure we're not already connected. */ | |
848 | if (sl && sl->magic == SLIP_MAGIC) | |
849 | goto err_exit; | |
850 | ||
851 | /* OK. Find a free SLIP channel to use. */ | |
852 | err = -ENFILE; | |
9ce6cf25 AC |
853 | sl = sl_alloc(tty_devnum(tty)); |
854 | if (sl == NULL) | |
1da177e4 LT |
855 | goto err_exit; |
856 | ||
857 | sl->tty = tty; | |
858 | tty->disc_data = sl; | |
859 | sl->line = tty_devnum(tty); | |
860 | sl->pid = current->pid; | |
6aa20a22 | 861 | |
1da177e4 LT |
862 | if (!test_bit(SLF_INUSE, &sl->flags)) { |
863 | /* Perform the low-level SLIP initialization. */ | |
9ce6cf25 AC |
864 | err = sl_alloc_bufs(sl, SL_MTU); |
865 | if (err) | |
1da177e4 LT |
866 | goto err_free_chan; |
867 | ||
868 | set_bit(SLF_INUSE, &sl->flags); | |
869 | ||
9ce6cf25 AC |
870 | err = register_netdevice(sl->dev); |
871 | if (err) | |
1da177e4 LT |
872 | goto err_free_bufs; |
873 | } | |
874 | ||
875 | #ifdef CONFIG_SLIP_SMART | |
876 | if (sl->keepalive) { | |
9ce6cf25 AC |
877 | sl->keepalive_timer.expires = jiffies + sl->keepalive * HZ; |
878 | add_timer(&sl->keepalive_timer); | |
1da177e4 LT |
879 | } |
880 | if (sl->outfill) { | |
9ce6cf25 AC |
881 | sl->outfill_timer.expires = jiffies + sl->outfill * HZ; |
882 | add_timer(&sl->outfill_timer); | |
1da177e4 LT |
883 | } |
884 | #endif | |
885 | ||
886 | /* Done. We have linked the TTY line to a channel. */ | |
887 | rtnl_unlock(); | |
33f0f88f | 888 | tty->receive_room = 65536; /* We don't flow control */ |
1da177e4 LT |
889 | return sl->dev->base_addr; |
890 | ||
891 | err_free_bufs: | |
892 | sl_free_bufs(sl); | |
893 | ||
894 | err_free_chan: | |
895 | sl->tty = NULL; | |
896 | tty->disc_data = NULL; | |
897 | clear_bit(SLF_INUSE, &sl->flags); | |
898 | ||
899 | err_exit: | |
900 | rtnl_unlock(); | |
901 | ||
902 | /* Count references from TTY module */ | |
903 | return err; | |
904 | } | |
905 | ||
906 | /* | |
907 | ||
908 | FIXME: 1,2 are fixed 3 was never true anyway. | |
6aa20a22 | 909 | |
1da177e4 LT |
910 | Let me to blame a bit. |
911 | 1. TTY module calls this funstion on soft interrupt. | |
912 | 2. TTY module calls this function WITH MASKED INTERRUPTS! | |
913 | 3. TTY module does not notify us about line discipline | |
914 | shutdown, | |
915 | ||
916 | Seems, now it is clean. The solution is to consider netdevice and | |
917 | line discipline sides as two independent threads. | |
918 | ||
919 | By-product (not desired): sl? does not feel hangups and remains open. | |
920 | It is supposed, that user level program (dip, diald, slattach...) | |
6aa20a22 | 921 | will catch SIGHUP and make the rest of work. |
1da177e4 LT |
922 | |
923 | I see no way to make more with current tty code. --ANK | |
924 | */ | |
925 | ||
926 | /* | |
927 | * Close down a SLIP channel. | |
928 | * This means flushing out any pending queues, and then returning. This | |
929 | * call is serialized against other ldisc functions. | |
930 | */ | |
9ce6cf25 | 931 | static void slip_close(struct tty_struct *tty) |
1da177e4 | 932 | { |
9ce6cf25 | 933 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
934 | |
935 | /* First make sure we're connected. */ | |
936 | if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) | |
937 | return; | |
938 | ||
939 | tty->disc_data = NULL; | |
940 | sl->tty = NULL; | |
941 | if (!sl->leased) | |
942 | sl->line = 0; | |
943 | ||
944 | /* VSV = very important to remove timers */ | |
945 | #ifdef CONFIG_SLIP_SMART | |
946 | del_timer_sync(&sl->keepalive_timer); | |
947 | del_timer_sync(&sl->outfill_timer); | |
948 | #endif | |
949 | ||
950 | /* Count references from TTY module */ | |
951 | } | |
952 | ||
953 | /************************************************************************ | |
954 | * STANDARD SLIP ENCAPSULATION * | |
955 | ************************************************************************/ | |
956 | ||
9ce6cf25 | 957 | static int slip_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
958 | { |
959 | unsigned char *ptr = d; | |
960 | unsigned char c; | |
961 | ||
962 | /* | |
963 | * Send an initial END character to flush out any | |
964 | * data that may have accumulated in the receiver | |
965 | * due to line noise. | |
966 | */ | |
967 | ||
968 | *ptr++ = END; | |
969 | ||
970 | /* | |
971 | * For each byte in the packet, send the appropriate | |
972 | * character sequence, according to the SLIP protocol. | |
973 | */ | |
974 | ||
975 | while (len-- > 0) { | |
9ce6cf25 AC |
976 | switch (c = *s++) { |
977 | case END: | |
1da177e4 LT |
978 | *ptr++ = ESC; |
979 | *ptr++ = ESC_END; | |
980 | break; | |
9ce6cf25 | 981 | case ESC: |
1da177e4 LT |
982 | *ptr++ = ESC; |
983 | *ptr++ = ESC_ESC; | |
984 | break; | |
9ce6cf25 | 985 | default: |
1da177e4 LT |
986 | *ptr++ = c; |
987 | break; | |
988 | } | |
989 | } | |
990 | *ptr++ = END; | |
991 | return (ptr - d); | |
992 | } | |
993 | ||
994 | static void slip_unesc(struct slip *sl, unsigned char s) | |
995 | { | |
996 | ||
9ce6cf25 AC |
997 | switch (s) { |
998 | case END: | |
1da177e4 LT |
999 | #ifdef CONFIG_SLIP_SMART |
1000 | /* drop keeptest bit = VSV */ | |
1001 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1002 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1003 | #endif | |
1004 | ||
9ce6cf25 AC |
1005 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) |
1006 | && (sl->rcount > 2)) | |
1da177e4 | 1007 | sl_bump(sl); |
1da177e4 LT |
1008 | clear_bit(SLF_ESCAPE, &sl->flags); |
1009 | sl->rcount = 0; | |
1010 | return; | |
1011 | ||
9ce6cf25 | 1012 | case ESC: |
1da177e4 LT |
1013 | set_bit(SLF_ESCAPE, &sl->flags); |
1014 | return; | |
9ce6cf25 AC |
1015 | case ESC_ESC: |
1016 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 1017 | s = ESC; |
1da177e4 | 1018 | break; |
9ce6cf25 AC |
1019 | case ESC_END: |
1020 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) | |
1da177e4 | 1021 | s = END; |
1da177e4 LT |
1022 | break; |
1023 | } | |
1024 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1025 | if (sl->rcount < sl->buffsize) { | |
1026 | sl->rbuff[sl->rcount++] = s; | |
1027 | return; | |
1028 | } | |
1029 | sl->rx_over_errors++; | |
1030 | set_bit(SLF_ERROR, &sl->flags); | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | ||
1035 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1036 | /************************************************************************ | |
1037 | * 6 BIT SLIP ENCAPSULATION * | |
1038 | ************************************************************************/ | |
1039 | ||
9ce6cf25 | 1040 | static int slip_esc6(unsigned char *s, unsigned char *d, int len) |
1da177e4 LT |
1041 | { |
1042 | unsigned char *ptr = d; | |
1043 | unsigned char c; | |
1044 | int i; | |
1045 | unsigned short v = 0; | |
1046 | short bits = 0; | |
1047 | ||
1048 | /* | |
1049 | * Send an initial END character to flush out any | |
1050 | * data that may have accumulated in the receiver | |
1051 | * due to line noise. | |
1052 | */ | |
1053 | ||
1054 | *ptr++ = 0x70; | |
1055 | ||
1056 | /* | |
1057 | * Encode the packet into printable ascii characters | |
1058 | */ | |
1059 | ||
1060 | for (i = 0; i < len; ++i) { | |
1061 | v = (v << 8) | s[i]; | |
1062 | bits += 8; | |
1063 | while (bits >= 6) { | |
1064 | bits -= 6; | |
1065 | c = 0x30 + ((v >> bits) & 0x3F); | |
1066 | *ptr++ = c; | |
1067 | } | |
1068 | } | |
1069 | if (bits) { | |
1070 | c = 0x30 + ((v << (6 - bits)) & 0x3F); | |
1071 | *ptr++ = c; | |
1072 | } | |
1073 | *ptr++ = 0x70; | |
1074 | return ptr - d; | |
1075 | } | |
1076 | ||
9ce6cf25 | 1077 | static void slip_unesc6(struct slip *sl, unsigned char s) |
1da177e4 LT |
1078 | { |
1079 | unsigned char c; | |
1080 | ||
1081 | if (s == 0x70) { | |
1082 | #ifdef CONFIG_SLIP_SMART | |
1083 | /* drop keeptest bit = VSV */ | |
1084 | if (test_bit(SLF_KEEPTEST, &sl->flags)) | |
1085 | clear_bit(SLF_KEEPTEST, &sl->flags); | |
1086 | #endif | |
1087 | ||
9ce6cf25 AC |
1088 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) |
1089 | && (sl->rcount > 2)) | |
1da177e4 | 1090 | sl_bump(sl); |
1da177e4 LT |
1091 | sl->rcount = 0; |
1092 | sl->xbits = 0; | |
1093 | sl->xdata = 0; | |
9ce6cf25 | 1094 | } else if (s >= 0x30 && s < 0x70) { |
1da177e4 LT |
1095 | sl->xdata = (sl->xdata << 6) | ((s - 0x30) & 0x3F); |
1096 | sl->xbits += 6; | |
1097 | if (sl->xbits >= 8) { | |
1098 | sl->xbits -= 8; | |
1099 | c = (unsigned char)(sl->xdata >> sl->xbits); | |
1100 | if (!test_bit(SLF_ERROR, &sl->flags)) { | |
1101 | if (sl->rcount < sl->buffsize) { | |
1102 | sl->rbuff[sl->rcount++] = c; | |
1103 | return; | |
1104 | } | |
1105 | sl->rx_over_errors++; | |
1106 | set_bit(SLF_ERROR, &sl->flags); | |
1107 | } | |
1108 | } | |
9ce6cf25 | 1109 | } |
1da177e4 LT |
1110 | } |
1111 | #endif /* CONFIG_SLIP_MODE_SLIP6 */ | |
1112 | ||
1113 | /* Perform I/O control on an active SLIP channel. */ | |
9ce6cf25 AC |
1114 | static int slip_ioctl(struct tty_struct *tty, struct file *file, |
1115 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1116 | { |
9ce6cf25 | 1117 | struct slip *sl = tty->disc_data; |
1da177e4 LT |
1118 | unsigned int tmp; |
1119 | int __user *p = (int __user *)arg; | |
1120 | ||
1121 | /* First make sure we're connected. */ | |
9ce6cf25 | 1122 | if (!sl || sl->magic != SLIP_MAGIC) |
1da177e4 | 1123 | return -EINVAL; |
1da177e4 | 1124 | |
9ce6cf25 AC |
1125 | switch (cmd) { |
1126 | case SIOCGIFNAME: | |
1da177e4 LT |
1127 | tmp = strlen(sl->dev->name) + 1; |
1128 | if (copy_to_user((void __user *)arg, sl->dev->name, tmp)) | |
1129 | return -EFAULT; | |
1130 | return 0; | |
1131 | ||
1132 | case SIOCGIFENCAP: | |
1133 | if (put_user(sl->mode, p)) | |
1134 | return -EFAULT; | |
1135 | return 0; | |
1136 | ||
1137 | case SIOCSIFENCAP: | |
1138 | if (get_user(tmp, p)) | |
1139 | return -EFAULT; | |
1140 | #ifndef SL_INCLUDE_CSLIP | |
9ce6cf25 | 1141 | if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE)) |
1da177e4 | 1142 | return -EINVAL; |
1da177e4 LT |
1143 | #else |
1144 | if ((tmp & (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) == | |
9ce6cf25 | 1145 | (SL_MODE_ADAPTIVE | SL_MODE_CSLIP)) |
1da177e4 LT |
1146 | /* return -EINVAL; */ |
1147 | tmp &= ~SL_MODE_ADAPTIVE; | |
1da177e4 LT |
1148 | #endif |
1149 | #ifndef CONFIG_SLIP_MODE_SLIP6 | |
9ce6cf25 | 1150 | if (tmp & SL_MODE_SLIP6) |
1da177e4 | 1151 | return -EINVAL; |
1da177e4 LT |
1152 | #endif |
1153 | sl->mode = tmp; | |
9ce6cf25 | 1154 | sl->dev->type = ARPHRD_SLIP + sl->mode; |
1da177e4 LT |
1155 | return 0; |
1156 | ||
9ce6cf25 | 1157 | case SIOCSIFHWADDR: |
1da177e4 LT |
1158 | return -EINVAL; |
1159 | ||
1160 | #ifdef CONFIG_SLIP_SMART | |
1161 | /* VSV changes start here */ | |
9ce6cf25 | 1162 | case SIOCSKEEPALIVE: |
1da177e4 LT |
1163 | if (get_user(tmp, p)) |
1164 | return -EFAULT; | |
9ce6cf25 | 1165 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1166 | return -EINVAL; |
1167 | ||
1168 | spin_lock_bh(&sl->lock); | |
1169 | if (!sl->tty) { | |
1170 | spin_unlock_bh(&sl->lock); | |
1171 | return -ENODEV; | |
1172 | } | |
9ce6cf25 AC |
1173 | sl->keepalive = (u8)tmp; |
1174 | if (sl->keepalive != 0) { | |
1175 | mod_timer(&sl->keepalive_timer, | |
1176 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1177 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1178 | } else |
1179 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1180 | spin_unlock_bh(&sl->lock); |
1181 | return 0; | |
1182 | ||
9ce6cf25 | 1183 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1184 | if (put_user(sl->keepalive, p)) |
1185 | return -EFAULT; | |
1186 | return 0; | |
1187 | ||
9ce6cf25 | 1188 | case SIOCSOUTFILL: |
1da177e4 LT |
1189 | if (get_user(tmp, p)) |
1190 | return -EFAULT; | |
9ce6cf25 | 1191 | if (tmp > 255) /* max for unchar */ |
1da177e4 LT |
1192 | return -EINVAL; |
1193 | spin_lock_bh(&sl->lock); | |
1194 | if (!sl->tty) { | |
1195 | spin_unlock_bh(&sl->lock); | |
1196 | return -ENODEV; | |
1197 | } | |
9ce6cf25 AC |
1198 | sl->outfill = (u8)tmp; |
1199 | if (sl->outfill != 0) { | |
1200 | mod_timer(&sl->outfill_timer, | |
1201 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1202 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1203 | } else |
1204 | del_timer(&sl->outfill_timer); | |
1da177e4 | 1205 | spin_unlock_bh(&sl->lock); |
9ce6cf25 | 1206 | return 0; |
1da177e4 | 1207 | |
9ce6cf25 | 1208 | case SIOCGOUTFILL: |
1da177e4 LT |
1209 | if (put_user(sl->outfill, p)) |
1210 | return -EFAULT; | |
1211 | return 0; | |
1212 | /* VSV changes end */ | |
1213 | #endif | |
1da177e4 | 1214 | default: |
d0127539 | 1215 | return tty_mode_ioctl(tty, file, cmd, arg); |
1da177e4 LT |
1216 | } |
1217 | } | |
1218 | ||
1219 | /* VSV changes start here */ | |
1220 | #ifdef CONFIG_SLIP_SMART | |
1221 | /* function do_ioctl called from net/core/dev.c | |
1222 | to allow get/set outfill/keepalive parameter | |
1223 | by ifconfig */ | |
1224 | ||
9ce6cf25 | 1225 | static int sl_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
1da177e4 LT |
1226 | { |
1227 | struct slip *sl = netdev_priv(dev); | |
1228 | unsigned long *p = (unsigned long *)&rq->ifr_ifru; | |
1229 | ||
1230 | if (sl == NULL) /* Allocation failed ?? */ | |
1231 | return -ENODEV; | |
1232 | ||
1233 | spin_lock_bh(&sl->lock); | |
1234 | ||
1235 | if (!sl->tty) { | |
1236 | spin_unlock_bh(&sl->lock); | |
1237 | return -ENODEV; | |
1238 | } | |
1239 | ||
9ce6cf25 AC |
1240 | switch (cmd) { |
1241 | case SIOCSKEEPALIVE: | |
1da177e4 | 1242 | /* max for unchar */ |
9ce6cf25 | 1243 | if ((unsigned)*p > 255) { |
1da177e4 LT |
1244 | spin_unlock_bh(&sl->lock); |
1245 | return -EINVAL; | |
1246 | } | |
9ce6cf25 | 1247 | sl->keepalive = (u8)*p; |
1da177e4 | 1248 | if (sl->keepalive != 0) { |
9ce6cf25 AC |
1249 | sl->keepalive_timer.expires = |
1250 | jiffies + sl->keepalive * HZ; | |
1251 | mod_timer(&sl->keepalive_timer, | |
1252 | jiffies + sl->keepalive * HZ); | |
1da177e4 | 1253 | set_bit(SLF_KEEPTEST, &sl->flags); |
9ce6cf25 AC |
1254 | } else |
1255 | del_timer(&sl->keepalive_timer); | |
1da177e4 LT |
1256 | break; |
1257 | ||
9ce6cf25 | 1258 | case SIOCGKEEPALIVE: |
1da177e4 LT |
1259 | *p = sl->keepalive; |
1260 | break; | |
1261 | ||
9ce6cf25 AC |
1262 | case SIOCSOUTFILL: |
1263 | if ((unsigned)*p > 255) { /* max for unchar */ | |
1da177e4 LT |
1264 | spin_unlock_bh(&sl->lock); |
1265 | return -EINVAL; | |
1266 | } | |
9ce6cf25 AC |
1267 | sl->outfill = (u8)*p; |
1268 | if (sl->outfill != 0) { | |
1269 | mod_timer(&sl->outfill_timer, | |
1270 | jiffies + sl->outfill * HZ); | |
1da177e4 | 1271 | set_bit(SLF_OUTWAIT, &sl->flags); |
9ce6cf25 AC |
1272 | } else |
1273 | del_timer(&sl->outfill_timer); | |
1274 | break; | |
1da177e4 | 1275 | |
9ce6cf25 | 1276 | case SIOCGOUTFILL: |
1da177e4 LT |
1277 | *p = sl->outfill; |
1278 | break; | |
1279 | ||
9ce6cf25 | 1280 | case SIOCSLEASE: |
6aa20a22 | 1281 | /* Resolve race condition, when ioctl'ing hanged up |
1da177e4 LT |
1282 | and opened by another process device. |
1283 | */ | |
9ce6cf25 AC |
1284 | if (sl->tty != current->signal->tty && |
1285 | sl->pid != current->pid) { | |
1da177e4 LT |
1286 | spin_unlock_bh(&sl->lock); |
1287 | return -EPERM; | |
1288 | } | |
1289 | sl->leased = 0; | |
9ce6cf25 | 1290 | if (*p) |
1da177e4 | 1291 | sl->leased = 1; |
9ce6cf25 | 1292 | break; |
1da177e4 | 1293 | |
9ce6cf25 | 1294 | case SIOCGLEASE: |
1da177e4 LT |
1295 | *p = sl->leased; |
1296 | }; | |
1297 | spin_unlock_bh(&sl->lock); | |
1298 | return 0; | |
1299 | } | |
1300 | #endif | |
1301 | /* VSV changes end */ | |
1302 | ||
a352def2 | 1303 | static struct tty_ldisc_ops sl_ldisc = { |
1da177e4 LT |
1304 | .owner = THIS_MODULE, |
1305 | .magic = TTY_LDISC_MAGIC, | |
1306 | .name = "slip", | |
1307 | .open = slip_open, | |
1308 | .close = slip_close, | |
1309 | .ioctl = slip_ioctl, | |
1310 | .receive_buf = slip_receive_buf, | |
1da177e4 LT |
1311 | .write_wakeup = slip_write_wakeup, |
1312 | }; | |
1313 | ||
1314 | static int __init slip_init(void) | |
1315 | { | |
1316 | int status; | |
1317 | ||
1318 | if (slip_maxdev < 4) | |
1319 | slip_maxdev = 4; /* Sanity */ | |
1320 | ||
1321 | printk(KERN_INFO "SLIP: version %s (dynamic channels, max=%d)" | |
1322 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1323 | " (6 bit encapsulation enabled)" | |
1324 | #endif | |
1325 | ".\n", | |
9ce6cf25 | 1326 | SLIP_VERSION, slip_maxdev); |
1da177e4 LT |
1327 | #if defined(SL_INCLUDE_CSLIP) |
1328 | printk(KERN_INFO "CSLIP: code copyright 1989 Regents of the University of California.\n"); | |
1329 | #endif | |
1330 | #ifdef CONFIG_SLIP_SMART | |
1331 | printk(KERN_INFO "SLIP linefill/keepalive option.\n"); | |
1332 | #endif | |
1333 | ||
9ce6cf25 AC |
1334 | slip_devs = kzalloc(sizeof(struct net_device *)*slip_maxdev, |
1335 | GFP_KERNEL); | |
1da177e4 | 1336 | if (!slip_devs) { |
9ce6cf25 | 1337 | printk(KERN_ERR "SLIP: Can't allocate slip devices array.\n"); |
1da177e4 LT |
1338 | return -ENOMEM; |
1339 | } | |
1340 | ||
1da177e4 | 1341 | /* Fill in our line protocol discipline, and register it */ |
9ce6cf25 AC |
1342 | status = tty_register_ldisc(N_SLIP, &sl_ldisc); |
1343 | if (status != 0) { | |
1da177e4 LT |
1344 | printk(KERN_ERR "SLIP: can't register line discipline (err = %d)\n", status); |
1345 | kfree(slip_devs); | |
1346 | } | |
1347 | return status; | |
1348 | } | |
1349 | ||
1350 | static void __exit slip_exit(void) | |
1351 | { | |
1352 | int i; | |
1353 | struct net_device *dev; | |
1354 | struct slip *sl; | |
1355 | unsigned long timeout = jiffies + HZ; | |
1356 | int busy = 0; | |
1357 | ||
6aa20a22 | 1358 | if (slip_devs == NULL) |
1da177e4 LT |
1359 | return; |
1360 | ||
1361 | /* First of all: check for active disciplines and hangup them. | |
1362 | */ | |
1363 | do { | |
a9fc2510 NA |
1364 | if (busy) |
1365 | msleep_interruptible(100); | |
1da177e4 LT |
1366 | |
1367 | busy = 0; | |
1368 | for (i = 0; i < slip_maxdev; i++) { | |
1369 | dev = slip_devs[i]; | |
1370 | if (!dev) | |
1371 | continue; | |
1372 | sl = netdev_priv(dev); | |
1373 | spin_lock_bh(&sl->lock); | |
1374 | if (sl->tty) { | |
1375 | busy++; | |
1376 | tty_hangup(sl->tty); | |
1377 | } | |
1378 | spin_unlock_bh(&sl->lock); | |
1379 | } | |
1380 | } while (busy && time_before(jiffies, timeout)); | |
1381 | ||
1382 | ||
1383 | for (i = 0; i < slip_maxdev; i++) { | |
1384 | dev = slip_devs[i]; | |
1385 | if (!dev) | |
1386 | continue; | |
1387 | slip_devs[i] = NULL; | |
1388 | ||
1389 | sl = netdev_priv(dev); | |
1390 | if (sl->tty) { | |
1391 | printk(KERN_ERR "%s: tty discipline still running\n", | |
1392 | dev->name); | |
1393 | /* Intentionally leak the control block. */ | |
1394 | dev->destructor = NULL; | |
6aa20a22 | 1395 | } |
1da177e4 LT |
1396 | |
1397 | unregister_netdev(dev); | |
1398 | } | |
1399 | ||
1400 | kfree(slip_devs); | |
1401 | slip_devs = NULL; | |
1402 | ||
9ce6cf25 AC |
1403 | i = tty_unregister_ldisc(N_SLIP); |
1404 | if (i != 0) | |
1da177e4 | 1405 | printk(KERN_ERR "SLIP: can't unregister line discipline (err = %d)\n", i); |
1da177e4 LT |
1406 | } |
1407 | ||
1408 | module_init(slip_init); | |
1409 | module_exit(slip_exit); | |
1410 | ||
1411 | #ifdef CONFIG_SLIP_SMART | |
1412 | /* | |
1413 | * This is start of the code for multislip style line checking | |
1414 | * added by Stanislav Voronyi. All changes before marked VSV | |
1415 | */ | |
1416 | ||
1417 | static void sl_outfill(unsigned long sls) | |
1418 | { | |
9ce6cf25 | 1419 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1420 | |
1421 | spin_lock(&sl->lock); | |
1422 | ||
1423 | if (sl->tty == NULL) | |
1424 | goto out; | |
1425 | ||
9ce6cf25 AC |
1426 | if (sl->outfill) { |
1427 | if (test_bit(SLF_OUTWAIT, &sl->flags)) { | |
1da177e4 LT |
1428 | /* no packets were transmitted, do outfill */ |
1429 | #ifdef CONFIG_SLIP_MODE_SLIP6 | |
1430 | unsigned char s = (sl->mode & SL_MODE_SLIP6)?0x70:END; | |
1431 | #else | |
1432 | unsigned char s = END; | |
1433 | #endif | |
1434 | /* put END into tty queue. Is it right ??? */ | |
9ce6cf25 | 1435 | if (!netif_queue_stopped(sl->dev)) { |
1da177e4 | 1436 | /* if device busy no outfill */ |
f34d7a5b | 1437 | sl->tty->ops->write(sl->tty, &s, 1); |
1da177e4 | 1438 | } |
9ce6cf25 | 1439 | } else |
1da177e4 LT |
1440 | set_bit(SLF_OUTWAIT, &sl->flags); |
1441 | ||
1442 | mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ); | |
1443 | } | |
1444 | out: | |
1445 | spin_unlock(&sl->lock); | |
1446 | } | |
1447 | ||
1448 | static void sl_keepalive(unsigned long sls) | |
1449 | { | |
9ce6cf25 | 1450 | struct slip *sl = (struct slip *)sls; |
1da177e4 LT |
1451 | |
1452 | spin_lock(&sl->lock); | |
1453 | ||
1454 | if (sl->tty == NULL) | |
1455 | goto out; | |
1456 | ||
9ce6cf25 AC |
1457 | if (sl->keepalive) { |
1458 | if (test_bit(SLF_KEEPTEST, &sl->flags)) { | |
1da177e4 | 1459 | /* keepalive still high :(, we must hangup */ |
9ce6cf25 AC |
1460 | if (sl->outfill) |
1461 | /* outfill timer must be deleted too */ | |
1da177e4 LT |
1462 | (void)del_timer(&sl->outfill_timer); |
1463 | printk(KERN_DEBUG "%s: no packets received during keepalive timeout, hangup.\n", sl->dev->name); | |
9ce6cf25 AC |
1464 | /* this must hangup tty & close slip */ |
1465 | tty_hangup(sl->tty); | |
1da177e4 LT |
1466 | /* I think we need not something else */ |
1467 | goto out; | |
9ce6cf25 | 1468 | } else |
1da177e4 LT |
1469 | set_bit(SLF_KEEPTEST, &sl->flags); |
1470 | ||
1471 | mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ); | |
1472 | } | |
1da177e4 LT |
1473 | out: |
1474 | spin_unlock(&sl->lock); | |
1475 | } | |
1476 | ||
1477 | #endif | |
1478 | MODULE_LICENSE("GPL"); | |
1479 | MODULE_ALIAS_LDISC(N_SLIP); |