Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
815f62bf RB |
2 | * This program is free software; you can distribute it and/or modify it |
3 | * under the terms of the GNU General Public License (Version 2) as | |
4 | * published by the Free Software Foundation. | |
1da177e4 | 5 | * |
815f62bf RB |
6 | * This program is distributed in the hope it will be useful, but WITHOUT |
7 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
8 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
9 | * for more details. | |
1da177e4 | 10 | * |
815f62bf | 11 | * You should have received a copy of the GNU General Public License along |
adf8d3ff | 12 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 | 13 | * |
815f62bf RB |
14 | * Copyright (C) Hans Alblas PE1AYX <hans@esrac.ele.tue.nl> |
15 | * Copyright (C) 2004, 05 Ralf Baechle DL5RB <ralf@linux-mips.org> | |
5793f4be | 16 | * Copyright (C) 2004, 05 Thomas Osterried DL9SAU <thomas@x-berg.in-berlin.de> |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include <linux/module.h> |
1da177e4 LT |
19 | #include <linux/bitops.h> |
20 | #include <asm/uaccess.h> | |
5793f4be | 21 | #include <linux/crc16.h> |
1da177e4 LT |
22 | #include <linux/string.h> |
23 | #include <linux/mm.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/inet.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 LT |
28 | #include <linux/tty.h> |
29 | #include <linux/errno.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/major.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/rtnetlink.h> | |
34 | #include <linux/etherdevice.h> | |
35 | #include <linux/skbuff.h> | |
36 | #include <linux/if_arp.h> | |
cd8749b4 | 37 | #include <linux/jiffies.h> |
9646e7ce | 38 | #include <linux/compat.h> |
1da177e4 LT |
39 | |
40 | #include <net/ax25.h> | |
41 | ||
815f62bf RB |
42 | #define AX_MTU 236 |
43 | ||
44 | /* SLIP/KISS protocol characters. */ | |
45 | #define END 0300 /* indicates end of frame */ | |
46 | #define ESC 0333 /* indicates byte stuffing */ | |
47 | #define ESC_END 0334 /* ESC ESC_END means END 'data' */ | |
48 | #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ | |
49 | ||
50 | struct mkiss { | |
51 | struct tty_struct *tty; /* ptr to TTY structure */ | |
52 | struct net_device *dev; /* easy for intr handling */ | |
53 | ||
54 | /* These are pointers to the malloc()ed frame buffers. */ | |
55 | spinlock_t buflock;/* lock for rbuf and xbuf */ | |
56 | unsigned char *rbuff; /* receiver buffer */ | |
57 | int rcount; /* received chars counter */ | |
58 | unsigned char *xbuff; /* transmitter buffer */ | |
59 | unsigned char *xhead; /* pointer to next byte to XMIT */ | |
60 | int xleft; /* bytes left in XMIT queue */ | |
61 | ||
815f62bf RB |
62 | /* Detailed SLIP statistics. */ |
63 | int mtu; /* Our mtu (to spot changes!) */ | |
64 | int buffsize; /* Max buffers sizes */ | |
65 | ||
66 | unsigned long flags; /* Flag values/ mode etc */ | |
67 | /* long req'd: used by set_bit --RR */ | |
68 | #define AXF_INUSE 0 /* Channel in use */ | |
69 | #define AXF_ESCAPE 1 /* ESC received */ | |
70 | #define AXF_ERROR 2 /* Parity, etc. error */ | |
71 | #define AXF_KEEPTEST 3 /* Keepalive test flag */ | |
72 | #define AXF_OUTWAIT 4 /* is outpacket was flag */ | |
73 | ||
74 | int mode; | |
75 | int crcmode; /* MW: for FlexNet, SMACK etc. */ | |
5793f4be RB |
76 | int crcauto; /* CRC auto mode */ |
77 | ||
78 | #define CRC_MODE_NONE 0 | |
79 | #define CRC_MODE_FLEX 1 | |
80 | #define CRC_MODE_SMACK 2 | |
81 | #define CRC_MODE_FLEX_TEST 3 | |
82 | #define CRC_MODE_SMACK_TEST 4 | |
815f62bf RB |
83 | |
84 | atomic_t refcnt; | |
85 | struct semaphore dead_sem; | |
86 | }; | |
1da177e4 LT |
87 | |
88 | /*---------------------------------------------------------------------------*/ | |
89 | ||
815f62bf RB |
90 | static const unsigned short crc_flex_table[] = { |
91 | 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38, | |
92 | 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770, | |
93 | 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9, | |
94 | 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1, | |
95 | 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a, | |
96 | 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672, | |
97 | 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb, | |
98 | 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3, | |
99 | 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c, | |
100 | 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574, | |
101 | 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd, | |
102 | 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5, | |
103 | 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e, | |
104 | 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476, | |
105 | 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf, | |
106 | 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7, | |
107 | 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30, | |
108 | 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378, | |
109 | 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1, | |
110 | 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9, | |
111 | 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32, | |
112 | 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a, | |
113 | 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3, | |
114 | 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb, | |
115 | 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34, | |
116 | 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c, | |
117 | 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5, | |
118 | 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd, | |
119 | 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36, | |
120 | 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e, | |
121 | 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7, | |
122 | 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff | |
1da177e4 LT |
123 | }; |
124 | ||
1da177e4 LT |
125 | static unsigned short calc_crc_flex(unsigned char *cp, int size) |
126 | { | |
815f62bf | 127 | unsigned short crc = 0xffff; |
1da177e4 | 128 | |
815f62bf RB |
129 | while (size--) |
130 | crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; | |
1da177e4 | 131 | |
815f62bf RB |
132 | return crc; |
133 | } | |
1da177e4 LT |
134 | |
135 | static int check_crc_flex(unsigned char *cp, int size) | |
136 | { | |
815f62bf | 137 | unsigned short crc = 0xffff; |
1da177e4 | 138 | |
815f62bf RB |
139 | if (size < 3) |
140 | return -1; | |
1da177e4 | 141 | |
815f62bf RB |
142 | while (size--) |
143 | crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; | |
1da177e4 | 144 | |
815f62bf RB |
145 | if ((crc & 0xffff) != 0x7070) |
146 | return -1; | |
1da177e4 | 147 | |
815f62bf | 148 | return 0; |
1da177e4 LT |
149 | } |
150 | ||
5793f4be RB |
151 | static int check_crc_16(unsigned char *cp, int size) |
152 | { | |
153 | unsigned short crc = 0x0000; | |
154 | ||
155 | if (size < 3) | |
156 | return -1; | |
157 | ||
158 | crc = crc16(0, cp, size); | |
159 | ||
160 | if (crc != 0x0000) | |
161 | return -1; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
815f62bf RB |
166 | /* |
167 | * Standard encapsulation | |
168 | */ | |
1da177e4 | 169 | |
815f62bf | 170 | static int kiss_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 | 171 | { |
815f62bf RB |
172 | unsigned char *ptr = d; |
173 | unsigned char c; | |
1da177e4 | 174 | |
815f62bf RB |
175 | /* |
176 | * Send an initial END character to flush out any data that may have | |
177 | * accumulated in the receiver due to line noise. | |
178 | */ | |
1da177e4 | 179 | |
815f62bf | 180 | *ptr++ = END; |
1da177e4 | 181 | |
815f62bf RB |
182 | while (len-- > 0) { |
183 | switch (c = *s++) { | |
184 | case END: | |
185 | *ptr++ = ESC; | |
186 | *ptr++ = ESC_END; | |
1da177e4 | 187 | break; |
815f62bf RB |
188 | case ESC: |
189 | *ptr++ = ESC; | |
190 | *ptr++ = ESC_ESC; | |
191 | break; | |
192 | default: | |
193 | *ptr++ = c; | |
194 | break; | |
195 | } | |
1da177e4 LT |
196 | } |
197 | ||
815f62bf RB |
198 | *ptr++ = END; |
199 | ||
200 | return ptr - d; | |
201 | } | |
202 | ||
203 | /* | |
204 | * MW: | |
205 | * OK its ugly, but tell me a better solution without copying the | |
206 | * packet to a temporary buffer :-) | |
207 | */ | |
208 | static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc, | |
209 | int len) | |
210 | { | |
211 | unsigned char *ptr = d; | |
212 | unsigned char c=0; | |
213 | ||
214 | *ptr++ = END; | |
215 | while (len > 0) { | |
216 | if (len > 2) | |
217 | c = *s++; | |
218 | else if (len > 1) | |
219 | c = crc >> 8; | |
220 | else if (len > 0) | |
221 | c = crc & 0xff; | |
222 | ||
223 | len--; | |
1da177e4 | 224 | |
815f62bf RB |
225 | switch (c) { |
226 | case END: | |
227 | *ptr++ = ESC; | |
228 | *ptr++ = ESC_END; | |
229 | break; | |
230 | case ESC: | |
231 | *ptr++ = ESC; | |
232 | *ptr++ = ESC_ESC; | |
233 | break; | |
234 | default: | |
235 | *ptr++ = c; | |
236 | break; | |
237 | } | |
1da177e4 | 238 | } |
815f62bf RB |
239 | *ptr++ = END; |
240 | ||
241 | return ptr - d; | |
242 | } | |
243 | ||
244 | /* Send one completely decapsulated AX.25 packet to the AX.25 layer. */ | |
245 | static void ax_bump(struct mkiss *ax) | |
246 | { | |
247 | struct sk_buff *skb; | |
248 | int count; | |
249 | ||
250 | spin_lock_bh(&ax->buflock); | |
251 | if (ax->rbuff[0] > 0x0f) { | |
5793f4be RB |
252 | if (ax->rbuff[0] & 0x80) { |
253 | if (check_crc_16(ax->rbuff, ax->rcount) < 0) { | |
ddbe9a68 | 254 | ax->dev->stats.rx_errors++; |
5793f4be RB |
255 | spin_unlock_bh(&ax->buflock); |
256 | ||
257 | return; | |
258 | } | |
259 | if (ax->crcmode != CRC_MODE_SMACK && ax->crcauto) { | |
260 | printk(KERN_INFO | |
7b1401cf | 261 | "mkiss: %s: Switching to crc-smack\n", |
5793f4be RB |
262 | ax->dev->name); |
263 | ax->crcmode = CRC_MODE_SMACK; | |
264 | } | |
265 | ax->rcount -= 2; | |
266 | *ax->rbuff &= ~0x80; | |
267 | } else if (ax->rbuff[0] & 0x20) { | |
815f62bf | 268 | if (check_crc_flex(ax->rbuff, ax->rcount) < 0) { |
ddbe9a68 | 269 | ax->dev->stats.rx_errors++; |
5793f4be | 270 | spin_unlock_bh(&ax->buflock); |
815f62bf RB |
271 | return; |
272 | } | |
5793f4be RB |
273 | if (ax->crcmode != CRC_MODE_FLEX && ax->crcauto) { |
274 | printk(KERN_INFO | |
7b1401cf | 275 | "mkiss: %s: Switching to crc-flexnet\n", |
5793f4be RB |
276 | ax->dev->name); |
277 | ax->crcmode = CRC_MODE_FLEX; | |
278 | } | |
815f62bf | 279 | ax->rcount -= 2; |
5793f4be RB |
280 | |
281 | /* | |
282 | * dl9sau bugfix: the trailling two bytes flexnet crc | |
283 | * will not be passed to the kernel. thus we have to | |
284 | * correct the kissparm signature, because it indicates | |
285 | * a crc but there's none | |
815f62bf | 286 | */ |
5793f4be | 287 | *ax->rbuff &= ~0x20; |
1da177e4 | 288 | } |
815f62bf | 289 | } |
815f62bf RB |
290 | |
291 | count = ax->rcount; | |
292 | ||
293 | if ((skb = dev_alloc_skb(count)) == NULL) { | |
294 | printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", | |
295 | ax->dev->name); | |
ddbe9a68 | 296 | ax->dev->stats.rx_dropped++; |
9f30c768 | 297 | spin_unlock_bh(&ax->buflock); |
815f62bf | 298 | return; |
1da177e4 LT |
299 | } |
300 | ||
815f62bf | 301 | memcpy(skb_put(skb,count), ax->rbuff, count); |
815f62bf RB |
302 | skb->protocol = ax25_type_trans(skb, ax->dev); |
303 | netif_rx(skb); | |
ddbe9a68 SH |
304 | ax->dev->stats.rx_packets++; |
305 | ax->dev->stats.rx_bytes += count; | |
9f30c768 | 306 | spin_unlock_bh(&ax->buflock); |
1da177e4 LT |
307 | } |
308 | ||
815f62bf | 309 | static void kiss_unesc(struct mkiss *ax, unsigned char s) |
1da177e4 | 310 | { |
815f62bf RB |
311 | switch (s) { |
312 | case END: | |
313 | /* drop keeptest bit = VSV */ | |
314 | if (test_bit(AXF_KEEPTEST, &ax->flags)) | |
315 | clear_bit(AXF_KEEPTEST, &ax->flags); | |
316 | ||
317 | if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2)) | |
318 | ax_bump(ax); | |
319 | ||
320 | clear_bit(AXF_ESCAPE, &ax->flags); | |
321 | ax->rcount = 0; | |
322 | return; | |
323 | ||
324 | case ESC: | |
325 | set_bit(AXF_ESCAPE, &ax->flags); | |
326 | return; | |
327 | case ESC_ESC: | |
328 | if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) | |
329 | s = ESC; | |
330 | break; | |
331 | case ESC_END: | |
332 | if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) | |
333 | s = END; | |
334 | break; | |
335 | } | |
336 | ||
337 | spin_lock_bh(&ax->buflock); | |
338 | if (!test_bit(AXF_ERROR, &ax->flags)) { | |
339 | if (ax->rcount < ax->buffsize) { | |
340 | ax->rbuff[ax->rcount++] = s; | |
341 | spin_unlock_bh(&ax->buflock); | |
342 | return; | |
343 | } | |
344 | ||
ddbe9a68 | 345 | ax->dev->stats.rx_over_errors++; |
815f62bf RB |
346 | set_bit(AXF_ERROR, &ax->flags); |
347 | } | |
348 | spin_unlock_bh(&ax->buflock); | |
349 | } | |
350 | ||
351 | static int ax_set_mac_address(struct net_device *dev, void *addr) | |
352 | { | |
353 | struct sockaddr_ax25 *sa = addr; | |
354 | ||
932ff279 | 355 | netif_tx_lock_bh(dev); |
e308a5d8 | 356 | netif_addr_lock(dev); |
815f62bf | 357 | memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN); |
e308a5d8 | 358 | netif_addr_unlock(dev); |
932ff279 | 359 | netif_tx_unlock_bh(dev); |
815f62bf RB |
360 | |
361 | return 0; | |
1da177e4 LT |
362 | } |
363 | ||
815f62bf RB |
364 | /*---------------------------------------------------------------------------*/ |
365 | ||
366 | static void ax_changedmtu(struct mkiss *ax) | |
1da177e4 LT |
367 | { |
368 | struct net_device *dev = ax->dev; | |
369 | unsigned char *xbuff, *rbuff, *oxbuff, *orbuff; | |
370 | int len; | |
371 | ||
372 | len = dev->mtu * 2; | |
373 | ||
374 | /* | |
375 | * allow for arrival of larger UDP packets, even if we say not to | |
376 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
377 | * an MSS of 128 | |
378 | */ | |
379 | if (len < 576 * 2) | |
380 | len = 576 * 2; | |
381 | ||
382 | xbuff = kmalloc(len + 4, GFP_ATOMIC); | |
383 | rbuff = kmalloc(len + 4, GFP_ATOMIC); | |
384 | ||
385 | if (xbuff == NULL || rbuff == NULL) { | |
815f62bf RB |
386 | printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, " |
387 | "MTU change cancelled.\n", | |
1da177e4 LT |
388 | ax->dev->name); |
389 | dev->mtu = ax->mtu; | |
b4558ea9 JJ |
390 | kfree(xbuff); |
391 | kfree(rbuff); | |
1da177e4 LT |
392 | return; |
393 | } | |
394 | ||
395 | spin_lock_bh(&ax->buflock); | |
396 | ||
397 | oxbuff = ax->xbuff; | |
398 | ax->xbuff = xbuff; | |
399 | orbuff = ax->rbuff; | |
400 | ax->rbuff = rbuff; | |
401 | ||
402 | if (ax->xleft) { | |
403 | if (ax->xleft <= len) { | |
404 | memcpy(ax->xbuff, ax->xhead, ax->xleft); | |
405 | } else { | |
406 | ax->xleft = 0; | |
ddbe9a68 | 407 | dev->stats.tx_dropped++; |
1da177e4 LT |
408 | } |
409 | } | |
410 | ||
411 | ax->xhead = ax->xbuff; | |
412 | ||
413 | if (ax->rcount) { | |
414 | if (ax->rcount <= len) { | |
415 | memcpy(ax->rbuff, orbuff, ax->rcount); | |
416 | } else { | |
417 | ax->rcount = 0; | |
ddbe9a68 | 418 | dev->stats.rx_over_errors++; |
1da177e4 LT |
419 | set_bit(AXF_ERROR, &ax->flags); |
420 | } | |
421 | } | |
422 | ||
423 | ax->mtu = dev->mtu + 73; | |
424 | ax->buffsize = len; | |
425 | ||
426 | spin_unlock_bh(&ax->buflock); | |
427 | ||
815f62bf RB |
428 | kfree(oxbuff); |
429 | kfree(orbuff); | |
1da177e4 LT |
430 | } |
431 | ||
432 | /* Encapsulate one AX.25 packet and stuff into a TTY queue. */ | |
815f62bf | 433 | static void ax_encaps(struct net_device *dev, unsigned char *icp, int len) |
1da177e4 | 434 | { |
815f62bf | 435 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 LT |
436 | unsigned char *p; |
437 | int actual, count; | |
438 | ||
439 | if (ax->mtu != ax->dev->mtu + 73) /* Someone has been ifconfigging */ | |
440 | ax_changedmtu(ax); | |
441 | ||
442 | if (len > ax->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
443 | len = ax->mtu; | |
444 | printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name); | |
ddbe9a68 | 445 | dev->stats.tx_dropped++; |
815f62bf | 446 | netif_start_queue(dev); |
1da177e4 LT |
447 | return; |
448 | } | |
449 | ||
450 | p = icp; | |
451 | ||
452 | spin_lock_bh(&ax->buflock); | |
5793f4be RB |
453 | if ((*p & 0x0f) != 0) { |
454 | /* Configuration Command (kissparms(1). | |
455 | * Protocol spec says: never append CRC. | |
456 | * This fixes a very old bug in the linux | |
457 | * kiss driver. -- dl9sau */ | |
458 | switch (*p & 0xff) { | |
459 | case 0x85: | |
460 | /* command from userspace especially for us, | |
461 | * not for delivery to the tnc */ | |
462 | if (len > 1) { | |
463 | int cmd = (p[1] & 0xff); | |
464 | switch(cmd) { | |
465 | case 3: | |
466 | ax->crcmode = CRC_MODE_SMACK; | |
467 | break; | |
468 | case 2: | |
469 | ax->crcmode = CRC_MODE_FLEX; | |
470 | break; | |
471 | case 1: | |
472 | ax->crcmode = CRC_MODE_NONE; | |
473 | break; | |
474 | case 0: | |
475 | default: | |
476 | ax->crcmode = CRC_MODE_SMACK_TEST; | |
477 | cmd = 0; | |
478 | } | |
479 | ax->crcauto = (cmd ? 0 : 1); | |
480 | printk(KERN_INFO "mkiss: %s: crc mode %s %d\n", ax->dev->name, (len) ? "set to" : "is", cmd); | |
481 | } | |
482 | spin_unlock_bh(&ax->buflock); | |
483 | netif_start_queue(dev); | |
1da177e4 | 484 | |
5793f4be RB |
485 | return; |
486 | default: | |
c2fd03a0 | 487 | count = kiss_esc(p, ax->xbuff, len); |
5793f4be RB |
488 | } |
489 | } else { | |
490 | unsigned short crc; | |
491 | switch (ax->crcmode) { | |
492 | case CRC_MODE_SMACK_TEST: | |
493 | ax->crcmode = CRC_MODE_FLEX_TEST; | |
494 | printk(KERN_INFO "mkiss: %s: Trying crc-smack\n", ax->dev->name); | |
495 | // fall through | |
496 | case CRC_MODE_SMACK: | |
497 | *p |= 0x80; | |
498 | crc = swab16(crc16(0, p, len)); | |
c2fd03a0 | 499 | count = kiss_esc_crc(p, ax->xbuff, crc, len+2); |
5793f4be RB |
500 | break; |
501 | case CRC_MODE_FLEX_TEST: | |
502 | ax->crcmode = CRC_MODE_NONE; | |
503 | printk(KERN_INFO "mkiss: %s: Trying crc-flexnet\n", ax->dev->name); | |
504 | // fall through | |
505 | case CRC_MODE_FLEX: | |
506 | *p |= 0x20; | |
507 | crc = calc_crc_flex(p, len); | |
c2fd03a0 | 508 | count = kiss_esc_crc(p, ax->xbuff, crc, len+2); |
5793f4be RB |
509 | break; |
510 | ||
511 | default: | |
c2fd03a0 | 512 | count = kiss_esc(p, ax->xbuff, len); |
5793f4be RB |
513 | } |
514 | } | |
c1854ebc | 515 | spin_unlock_bh(&ax->buflock); |
1da177e4 | 516 | |
815f62bf | 517 | set_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); |
f34d7a5b | 518 | actual = ax->tty->ops->write(ax->tty, ax->xbuff, count); |
ddbe9a68 SH |
519 | dev->stats.tx_packets++; |
520 | dev->stats.tx_bytes += actual; | |
815f62bf | 521 | |
860e9538 | 522 | netif_trans_update(ax->dev); |
1da177e4 LT |
523 | ax->xleft = count - actual; |
524 | ax->xhead = ax->xbuff + actual; | |
1da177e4 LT |
525 | } |
526 | ||
1da177e4 | 527 | /* Encapsulate an AX.25 packet and kick it into a TTY queue. */ |
36e4d64a | 528 | static netdev_tx_t ax_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 529 | { |
815f62bf | 530 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 | 531 | |
1d5da757 EB |
532 | if (skb->protocol == htons(ETH_P_IP)) |
533 | return ax25_ip_xmit(skb); | |
534 | ||
1da177e4 LT |
535 | if (!netif_running(dev)) { |
536 | printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name); | |
5b548140 | 537 | return NETDEV_TX_BUSY; |
1da177e4 LT |
538 | } |
539 | ||
540 | if (netif_queue_stopped(dev)) { | |
541 | /* | |
542 | * May be we must check transmitter timeout here ? | |
543 | * 14 Oct 1994 Dmitry Gorodchanin. | |
544 | */ | |
4d0e9657 | 545 | if (time_before(jiffies, dev_trans_start(dev) + 20 * HZ)) { |
1da177e4 | 546 | /* 20 sec timeout not reached */ |
5b548140 | 547 | return NETDEV_TX_BUSY; |
1da177e4 LT |
548 | } |
549 | ||
550 | printk(KERN_ERR "mkiss: %s: transmit timed out, %s?\n", dev->name, | |
5608784f | 551 | (tty_chars_in_buffer(ax->tty) || ax->xleft) ? |
1da177e4 LT |
552 | "bad line quality" : "driver error"); |
553 | ||
554 | ax->xleft = 0; | |
815f62bf RB |
555 | clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); |
556 | netif_start_queue(dev); | |
1da177e4 LT |
557 | } |
558 | ||
559 | /* We were not busy, so we are now... :-) */ | |
feb27d15 DC |
560 | netif_stop_queue(dev); |
561 | ax_encaps(dev, skb->data, skb->len); | |
562 | kfree_skb(skb); | |
1da177e4 | 563 | |
6ed10654 | 564 | return NETDEV_TX_OK; |
1da177e4 LT |
565 | } |
566 | ||
815f62bf RB |
567 | static int ax_open_dev(struct net_device *dev) |
568 | { | |
569 | struct mkiss *ax = netdev_priv(dev); | |
570 | ||
571 | if (ax->tty == NULL) | |
572 | return -ENODEV; | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
1da177e4 LT |
577 | /* Open the low-level part of the AX25 channel. Easy! */ |
578 | static int ax_open(struct net_device *dev) | |
579 | { | |
815f62bf | 580 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 LT |
581 | unsigned long len; |
582 | ||
583 | if (ax->tty == NULL) | |
584 | return -ENODEV; | |
585 | ||
586 | /* | |
587 | * Allocate the frame buffers: | |
588 | * | |
589 | * rbuff Receive buffer. | |
590 | * xbuff Transmit buffer. | |
591 | */ | |
592 | len = dev->mtu * 2; | |
593 | ||
594 | /* | |
595 | * allow for arrival of larger UDP packets, even if we say not to | |
596 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
597 | * an MSS of 128 | |
598 | */ | |
599 | if (len < 576 * 2) | |
600 | len = 576 * 2; | |
601 | ||
602 | if ((ax->rbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL) | |
603 | goto norbuff; | |
604 | ||
605 | if ((ax->xbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL) | |
606 | goto noxbuff; | |
607 | ||
608 | ax->mtu = dev->mtu + 73; | |
609 | ax->buffsize = len; | |
610 | ax->rcount = 0; | |
611 | ax->xleft = 0; | |
612 | ||
613 | ax->flags &= (1 << AXF_INUSE); /* Clear ESCAPE & ERROR flags */ | |
614 | ||
615 | spin_lock_init(&ax->buflock); | |
616 | ||
1da177e4 LT |
617 | return 0; |
618 | ||
619 | noxbuff: | |
620 | kfree(ax->rbuff); | |
621 | ||
622 | norbuff: | |
623 | return -ENOMEM; | |
624 | } | |
625 | ||
626 | ||
627 | /* Close the low-level part of the AX25 channel. Easy! */ | |
628 | static int ax_close(struct net_device *dev) | |
629 | { | |
815f62bf | 630 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 | 631 | |
815f62bf RB |
632 | if (ax->tty) |
633 | clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); | |
1da177e4 LT |
634 | |
635 | netif_stop_queue(dev); | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
6095e081 SH |
640 | static const struct net_device_ops ax_netdev_ops = { |
641 | .ndo_open = ax_open_dev, | |
642 | .ndo_stop = ax_close, | |
643 | .ndo_start_xmit = ax_xmit, | |
644 | .ndo_set_mac_address = ax_set_mac_address, | |
645 | }; | |
646 | ||
815f62bf RB |
647 | static void ax_setup(struct net_device *dev) |
648 | { | |
815f62bf RB |
649 | /* Finish setting up the DEVICE info. */ |
650 | dev->mtu = AX_MTU; | |
815f62bf RB |
651 | dev->hard_header_len = 0; |
652 | dev->addr_len = 0; | |
653 | dev->type = ARPHRD_AX25; | |
654 | dev->tx_queue_len = 10; | |
56fc7e71 | 655 | dev->header_ops = &ax25_header_ops; |
6095e081 | 656 | dev->netdev_ops = &ax_netdev_ops; |
3b04ddde | 657 | |
815f62bf | 658 | |
15b1c0e8 RB |
659 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
660 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
815f62bf RB |
661 | |
662 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; | |
1da177e4 LT |
663 | } |
664 | ||
665 | /* | |
815f62bf RB |
666 | * We have a potential race on dereferencing tty->disc_data, because the tty |
667 | * layer provides no locking at all - thus one cpu could be running | |
668 | * sixpack_receive_buf while another calls sixpack_close, which zeroes | |
669 | * tty->disc_data and frees the memory that sixpack_receive_buf is using. The | |
670 | * best way to fix this is to use a rwlock in the tty struct, but for now we | |
671 | * use a single global rwlock for all ttys in ppp line discipline. | |
1da177e4 | 672 | */ |
d5919586 | 673 | static DEFINE_RWLOCK(disc_data_lock); |
815f62bf RB |
674 | |
675 | static struct mkiss *mkiss_get(struct tty_struct *tty) | |
1da177e4 | 676 | { |
815f62bf | 677 | struct mkiss *ax; |
1da177e4 | 678 | |
815f62bf RB |
679 | read_lock(&disc_data_lock); |
680 | ax = tty->disc_data; | |
681 | if (ax) | |
682 | atomic_inc(&ax->refcnt); | |
683 | read_unlock(&disc_data_lock); | |
1da177e4 | 684 | |
815f62bf RB |
685 | return ax; |
686 | } | |
1da177e4 | 687 | |
815f62bf RB |
688 | static void mkiss_put(struct mkiss *ax) |
689 | { | |
690 | if (atomic_dec_and_test(&ax->refcnt)) | |
691 | up(&ax->dead_sem); | |
1da177e4 LT |
692 | } |
693 | ||
5793f4be RB |
694 | static int crc_force = 0; /* Can be overridden with insmod */ |
695 | ||
815f62bf | 696 | static int mkiss_open(struct tty_struct *tty) |
1da177e4 | 697 | { |
815f62bf RB |
698 | struct net_device *dev; |
699 | struct mkiss *ax; | |
1da177e4 LT |
700 | int err; |
701 | ||
815f62bf RB |
702 | if (!capable(CAP_NET_ADMIN)) |
703 | return -EPERM; | |
f34d7a5b AC |
704 | if (tty->ops->write == NULL) |
705 | return -EOPNOTSUPP; | |
1da177e4 | 706 | |
c835a677 TG |
707 | dev = alloc_netdev(sizeof(struct mkiss), "ax%d", NET_NAME_UNKNOWN, |
708 | ax_setup); | |
815f62bf RB |
709 | if (!dev) { |
710 | err = -ENOMEM; | |
711 | goto out; | |
712 | } | |
713 | ||
714 | ax = netdev_priv(dev); | |
715 | ax->dev = dev; | |
716 | ||
717 | spin_lock_init(&ax->buflock); | |
718 | atomic_set(&ax->refcnt, 1); | |
495e64bd | 719 | sema_init(&ax->dead_sem, 0); |
1da177e4 LT |
720 | |
721 | ax->tty = tty; | |
722 | tty->disc_data = ax; | |
33f0f88f | 723 | tty->receive_room = 65535; |
1da177e4 | 724 | |
f34d7a5b | 725 | tty_driver_flush_buffer(tty); |
1da177e4 LT |
726 | |
727 | /* Restore default settings */ | |
815f62bf | 728 | dev->type = ARPHRD_AX25; |
1da177e4 LT |
729 | |
730 | /* Perform the low-level AX25 initialization. */ | |
9d332d92 FE |
731 | err = ax_open(ax->dev); |
732 | if (err) | |
815f62bf | 733 | goto out_free_netdev; |
1da177e4 | 734 | |
9d332d92 FE |
735 | err = register_netdev(dev); |
736 | if (err) | |
815f62bf | 737 | goto out_free_buffers; |
1da177e4 | 738 | |
5793f4be RB |
739 | /* after register_netdev() - because else printk smashes the kernel */ |
740 | switch (crc_force) { | |
741 | case 3: | |
742 | ax->crcmode = CRC_MODE_SMACK; | |
743 | printk(KERN_INFO "mkiss: %s: crc mode smack forced.\n", | |
744 | ax->dev->name); | |
745 | break; | |
746 | case 2: | |
747 | ax->crcmode = CRC_MODE_FLEX; | |
748 | printk(KERN_INFO "mkiss: %s: crc mode flexnet forced.\n", | |
749 | ax->dev->name); | |
750 | break; | |
751 | case 1: | |
752 | ax->crcmode = CRC_MODE_NONE; | |
753 | printk(KERN_INFO "mkiss: %s: crc mode disabled.\n", | |
754 | ax->dev->name); | |
755 | break; | |
756 | case 0: | |
757 | /* fall through */ | |
758 | default: | |
759 | crc_force = 0; | |
760 | printk(KERN_INFO "mkiss: %s: crc mode is auto.\n", | |
761 | ax->dev->name); | |
762 | ax->crcmode = CRC_MODE_SMACK_TEST; | |
763 | } | |
764 | ax->crcauto = (crc_force ? 0 : 1); | |
765 | ||
815f62bf | 766 | netif_start_queue(dev); |
1da177e4 | 767 | |
815f62bf RB |
768 | /* Done. We have linked the TTY line to a channel. */ |
769 | return 0; | |
1da177e4 | 770 | |
815f62bf RB |
771 | out_free_buffers: |
772 | kfree(ax->rbuff); | |
773 | kfree(ax->xbuff); | |
1da177e4 | 774 | |
815f62bf RB |
775 | out_free_netdev: |
776 | free_netdev(dev); | |
1da177e4 | 777 | |
815f62bf RB |
778 | out: |
779 | return err; | |
1da177e4 LT |
780 | } |
781 | ||
815f62bf | 782 | static void mkiss_close(struct tty_struct *tty) |
1da177e4 | 783 | { |
815f62bf | 784 | struct mkiss *ax; |
1da177e4 | 785 | |
6e4e2f81 | 786 | write_lock_bh(&disc_data_lock); |
815f62bf RB |
787 | ax = tty->disc_data; |
788 | tty->disc_data = NULL; | |
6e4e2f81 | 789 | write_unlock_bh(&disc_data_lock); |
1da177e4 | 790 | |
79ea13ce | 791 | if (!ax) |
815f62bf | 792 | return; |
1da177e4 LT |
793 | |
794 | /* | |
815f62bf RB |
795 | * We have now ensured that nobody can start using ap from now on, but |
796 | * we have to wait for all existing users to finish. | |
1da177e4 | 797 | */ |
815f62bf RB |
798 | if (!atomic_dec_and_test(&ax->refcnt)) |
799 | down(&ax->dead_sem); | |
fde55c45 A |
800 | /* |
801 | * Halt the transmit queue so that a new transmit cannot scribble | |
802 | * on our buffers | |
803 | */ | |
804 | netif_stop_queue(ax->dev); | |
1da177e4 | 805 | |
815f62bf RB |
806 | /* Free all AX25 frame buffers. */ |
807 | kfree(ax->rbuff); | |
808 | kfree(ax->xbuff); | |
1da177e4 | 809 | |
815f62bf | 810 | ax->tty = NULL; |
d79f16c0 DM |
811 | |
812 | unregister_netdev(ax->dev); | |
1da177e4 LT |
813 | } |
814 | ||
815f62bf RB |
815 | /* Perform I/O control on an active ax25 channel. */ |
816 | static int mkiss_ioctl(struct tty_struct *tty, struct file *file, | |
817 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 818 | { |
815f62bf | 819 | struct mkiss *ax = mkiss_get(tty); |
f40e0638 | 820 | struct net_device *dev; |
815f62bf | 821 | unsigned int tmp, err; |
1da177e4 | 822 | |
815f62bf RB |
823 | /* First make sure we're connected. */ |
824 | if (ax == NULL) | |
825 | return -ENXIO; | |
f40e0638 | 826 | dev = ax->dev; |
1da177e4 | 827 | |
815f62bf RB |
828 | switch (cmd) { |
829 | case SIOCGIFNAME: | |
830 | err = copy_to_user((void __user *) arg, ax->dev->name, | |
831 | strlen(ax->dev->name) + 1) ? -EFAULT : 0; | |
832 | break; | |
833 | ||
834 | case SIOCGIFENCAP: | |
835 | err = put_user(4, (int __user *) arg); | |
836 | break; | |
837 | ||
838 | case SIOCSIFENCAP: | |
839 | if (get_user(tmp, (int __user *) arg)) { | |
840 | err = -EFAULT; | |
841 | break; | |
1da177e4 | 842 | } |
1da177e4 | 843 | |
815f62bf RB |
844 | ax->mode = tmp; |
845 | dev->addr_len = AX25_ADDR_LEN; | |
846 | dev->hard_header_len = AX25_KISS_HEADER_LEN + | |
847 | AX25_MAX_HEADER_LEN + 3; | |
848 | dev->type = ARPHRD_AX25; | |
1da177e4 | 849 | |
815f62bf RB |
850 | err = 0; |
851 | break; | |
1da177e4 | 852 | |
815f62bf RB |
853 | case SIOCSIFHWADDR: { |
854 | char addr[AX25_ADDR_LEN]; | |
1da177e4 | 855 | |
815f62bf RB |
856 | if (copy_from_user(&addr, |
857 | (void __user *) arg, AX25_ADDR_LEN)) { | |
858 | err = -EFAULT; | |
1da177e4 | 859 | break; |
1da177e4 LT |
860 | } |
861 | ||
932ff279 | 862 | netif_tx_lock_bh(dev); |
815f62bf | 863 | memcpy(dev->dev_addr, addr, AX25_ADDR_LEN); |
932ff279 | 864 | netif_tx_unlock_bh(dev); |
815f62bf RB |
865 | |
866 | err = 0; | |
867 | break; | |
868 | } | |
869 | default: | |
870 | err = -ENOIOCTLCMD; | |
1da177e4 | 871 | } |
1da177e4 | 872 | |
815f62bf | 873 | mkiss_put(ax); |
1da177e4 | 874 | |
815f62bf | 875 | return err; |
1da177e4 LT |
876 | } |
877 | ||
9646e7ce AB |
878 | #ifdef CONFIG_COMPAT |
879 | static long mkiss_compat_ioctl(struct tty_struct *tty, struct file *file, | |
880 | unsigned int cmd, unsigned long arg) | |
881 | { | |
07c3c4ee | 882 | switch (cmd) { |
9646e7ce AB |
883 | case SIOCGIFNAME: |
884 | case SIOCGIFENCAP: | |
885 | case SIOCSIFENCAP: | |
886 | case SIOCSIFHWADDR: | |
887 | return mkiss_ioctl(tty, file, cmd, | |
888 | (unsigned long)compat_ptr(arg)); | |
889 | } | |
890 | ||
891 | return -ENOIOCTLCMD; | |
892 | } | |
893 | #endif | |
894 | ||
815f62bf RB |
895 | /* |
896 | * Handle the 'receiver data ready' interrupt. | |
897 | * This function is called by the 'tty_io' module in the kernel when | |
898 | * a block of data has been received, which can now be decapsulated | |
899 | * and sent on to the AX.25 layer for further processing. | |
900 | */ | |
55db4c64 LT |
901 | static void mkiss_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
902 | char *fp, int count) | |
1da177e4 | 903 | { |
815f62bf | 904 | struct mkiss *ax = mkiss_get(tty); |
1da177e4 | 905 | |
815f62bf | 906 | if (!ax) |
55db4c64 | 907 | return; |
1da177e4 | 908 | |
815f62bf RB |
909 | /* |
910 | * Argh! mtu change time! - costs us the packet part received | |
911 | * at the change | |
912 | */ | |
913 | if (ax->mtu != ax->dev->mtu + 73) | |
914 | ax_changedmtu(ax); | |
1da177e4 | 915 | |
815f62bf | 916 | /* Read the characters out of the buffer */ |
55db4c64 | 917 | while (count--) { |
815f62bf RB |
918 | if (fp != NULL && *fp++) { |
919 | if (!test_and_set_bit(AXF_ERROR, &ax->flags)) | |
ddbe9a68 | 920 | ax->dev->stats.rx_errors++; |
815f62bf RB |
921 | cp++; |
922 | continue; | |
923 | } | |
1da177e4 | 924 | |
815f62bf | 925 | kiss_unesc(ax, *cp++); |
1da177e4 | 926 | } |
815f62bf RB |
927 | |
928 | mkiss_put(ax); | |
39c2e60f | 929 | tty_unthrottle(tty); |
1da177e4 LT |
930 | } |
931 | ||
815f62bf RB |
932 | /* |
933 | * Called by the driver when there's room for more data. If we have | |
934 | * more packets to send, we send them here. | |
935 | */ | |
936 | static void mkiss_write_wakeup(struct tty_struct *tty) | |
1da177e4 | 937 | { |
815f62bf RB |
938 | struct mkiss *ax = mkiss_get(tty); |
939 | int actual; | |
1da177e4 | 940 | |
815f62bf RB |
941 | if (!ax) |
942 | return; | |
1da177e4 | 943 | |
815f62bf RB |
944 | if (ax->xleft <= 0) { |
945 | /* Now serial buffer is almost free & we can start | |
946 | * transmission of another packet | |
947 | */ | |
948 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
1da177e4 | 949 | |
815f62bf RB |
950 | netif_wake_queue(ax->dev); |
951 | goto out; | |
952 | } | |
1da177e4 | 953 | |
f34d7a5b | 954 | actual = tty->ops->write(tty, ax->xhead, ax->xleft); |
815f62bf RB |
955 | ax->xleft -= actual; |
956 | ax->xhead += actual; | |
1da177e4 | 957 | |
815f62bf RB |
958 | out: |
959 | mkiss_put(ax); | |
1da177e4 LT |
960 | } |
961 | ||
a352def2 | 962 | static struct tty_ldisc_ops ax_ldisc = { |
74cfe03f | 963 | .owner = THIS_MODULE, |
815f62bf RB |
964 | .magic = TTY_LDISC_MAGIC, |
965 | .name = "mkiss", | |
966 | .open = mkiss_open, | |
967 | .close = mkiss_close, | |
968 | .ioctl = mkiss_ioctl, | |
9646e7ce AB |
969 | #ifdef CONFIG_COMPAT |
970 | .compat_ioctl = mkiss_compat_ioctl, | |
971 | #endif | |
815f62bf | 972 | .receive_buf = mkiss_receive_buf, |
815f62bf RB |
973 | .write_wakeup = mkiss_write_wakeup |
974 | }; | |
1da177e4 | 975 | |
afa8c78b | 976 | static const char banner[] __initconst = KERN_INFO \ |
815f62bf | 977 | "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n"; |
afa8c78b | 978 | static const char msg_regfail[] __initconst = KERN_ERR \ |
815f62bf | 979 | "mkiss: can't register line discipline (err = %d)\n"; |
1da177e4 LT |
980 | |
981 | static int __init mkiss_init_driver(void) | |
982 | { | |
983 | int status; | |
984 | ||
985 | printk(banner); | |
986 | ||
eb33ae24 HE |
987 | status = tty_register_ldisc(N_AX25, &ax_ldisc); |
988 | if (status != 0) | |
989 | printk(msg_regfail, status); | |
1da177e4 | 990 | |
1da177e4 LT |
991 | return status; |
992 | } | |
993 | ||
afa8c78b | 994 | static const char msg_unregfail[] = KERN_ERR \ |
815f62bf RB |
995 | "mkiss: can't unregister line discipline (err = %d)\n"; |
996 | ||
1da177e4 LT |
997 | static void __exit mkiss_exit_driver(void) |
998 | { | |
815f62bf | 999 | int ret; |
1da177e4 | 1000 | |
815f62bf RB |
1001 | if ((ret = tty_unregister_ldisc(N_AX25))) |
1002 | printk(msg_unregfail, ret); | |
1da177e4 LT |
1003 | } |
1004 | ||
815f62bf | 1005 | MODULE_AUTHOR("Ralf Baechle DL5RB <ralf@linux-mips.org>"); |
1da177e4 | 1006 | MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs"); |
8d3b33f6 | 1007 | module_param(crc_force, int, 0); |
5793f4be | 1008 | MODULE_PARM_DESC(crc_force, "crc [0 = auto | 1 = none | 2 = flexnet | 3 = smack]"); |
1da177e4 LT |
1009 | MODULE_LICENSE("GPL"); |
1010 | MODULE_ALIAS_LDISC(N_AX25); | |
815f62bf | 1011 | |
1da177e4 LT |
1012 | module_init(mkiss_init_driver); |
1013 | module_exit(mkiss_exit_driver); |