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 RB |
11 | * You should have received a copy of the GNU General Public License along |
12 | * with this program; if not, write to the Free Software Foundation, Inc., | |
13 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
1da177e4 | 14 | * |
815f62bf RB |
15 | * Copyright (C) Hans Alblas PE1AYX <hans@esrac.ele.tue.nl> |
16 | * Copyright (C) 2004, 05 Ralf Baechle DL5RB <ralf@linux-mips.org> | |
5793f4be | 17 | * Copyright (C) 2004, 05 Thomas Osterried DL9SAU <thomas@x-berg.in-berlin.de> |
1da177e4 | 18 | */ |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <asm/system.h> | |
21 | #include <linux/bitops.h> | |
22 | #include <asm/uaccess.h> | |
5793f4be | 23 | #include <linux/crc16.h> |
1da177e4 LT |
24 | #include <linux/string.h> |
25 | #include <linux/mm.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
1da177e4 LT |
30 | #include <linux/tty.h> |
31 | #include <linux/errno.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/major.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/rtnetlink.h> | |
36 | #include <linux/etherdevice.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/if_arp.h> | |
cd8749b4 | 39 | #include <linux/jiffies.h> |
9646e7ce | 40 | #include <linux/compat.h> |
1da177e4 LT |
41 | |
42 | #include <net/ax25.h> | |
43 | ||
815f62bf RB |
44 | #define AX_MTU 236 |
45 | ||
46 | /* SLIP/KISS protocol characters. */ | |
47 | #define END 0300 /* indicates end of frame */ | |
48 | #define ESC 0333 /* indicates byte stuffing */ | |
49 | #define ESC_END 0334 /* ESC ESC_END means END 'data' */ | |
50 | #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ | |
51 | ||
52 | struct mkiss { | |
53 | struct tty_struct *tty; /* ptr to TTY structure */ | |
54 | struct net_device *dev; /* easy for intr handling */ | |
55 | ||
56 | /* These are pointers to the malloc()ed frame buffers. */ | |
57 | spinlock_t buflock;/* lock for rbuf and xbuf */ | |
58 | unsigned char *rbuff; /* receiver buffer */ | |
59 | int rcount; /* received chars counter */ | |
60 | unsigned char *xbuff; /* transmitter buffer */ | |
61 | unsigned char *xhead; /* pointer to next byte to XMIT */ | |
62 | int xleft; /* bytes left in XMIT queue */ | |
63 | ||
815f62bf RB |
64 | /* Detailed SLIP statistics. */ |
65 | int mtu; /* Our mtu (to spot changes!) */ | |
66 | int buffsize; /* Max buffers sizes */ | |
67 | ||
68 | unsigned long flags; /* Flag values/ mode etc */ | |
69 | /* long req'd: used by set_bit --RR */ | |
70 | #define AXF_INUSE 0 /* Channel in use */ | |
71 | #define AXF_ESCAPE 1 /* ESC received */ | |
72 | #define AXF_ERROR 2 /* Parity, etc. error */ | |
73 | #define AXF_KEEPTEST 3 /* Keepalive test flag */ | |
74 | #define AXF_OUTWAIT 4 /* is outpacket was flag */ | |
75 | ||
76 | int mode; | |
77 | int crcmode; /* MW: for FlexNet, SMACK etc. */ | |
5793f4be RB |
78 | int crcauto; /* CRC auto mode */ |
79 | ||
80 | #define CRC_MODE_NONE 0 | |
81 | #define CRC_MODE_FLEX 1 | |
82 | #define CRC_MODE_SMACK 2 | |
83 | #define CRC_MODE_FLEX_TEST 3 | |
84 | #define CRC_MODE_SMACK_TEST 4 | |
815f62bf RB |
85 | |
86 | atomic_t refcnt; | |
87 | struct semaphore dead_sem; | |
88 | }; | |
1da177e4 LT |
89 | |
90 | /*---------------------------------------------------------------------------*/ | |
91 | ||
815f62bf RB |
92 | static const unsigned short crc_flex_table[] = { |
93 | 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38, | |
94 | 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770, | |
95 | 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9, | |
96 | 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1, | |
97 | 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a, | |
98 | 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672, | |
99 | 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb, | |
100 | 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3, | |
101 | 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c, | |
102 | 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574, | |
103 | 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd, | |
104 | 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5, | |
105 | 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e, | |
106 | 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476, | |
107 | 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf, | |
108 | 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7, | |
109 | 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30, | |
110 | 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378, | |
111 | 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1, | |
112 | 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9, | |
113 | 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32, | |
114 | 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a, | |
115 | 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3, | |
116 | 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb, | |
117 | 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34, | |
118 | 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c, | |
119 | 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5, | |
120 | 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd, | |
121 | 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36, | |
122 | 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e, | |
123 | 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7, | |
124 | 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff | |
1da177e4 LT |
125 | }; |
126 | ||
1da177e4 LT |
127 | static unsigned short calc_crc_flex(unsigned char *cp, int size) |
128 | { | |
815f62bf | 129 | unsigned short crc = 0xffff; |
1da177e4 | 130 | |
815f62bf RB |
131 | while (size--) |
132 | crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; | |
1da177e4 | 133 | |
815f62bf RB |
134 | return crc; |
135 | } | |
1da177e4 LT |
136 | |
137 | static int check_crc_flex(unsigned char *cp, int size) | |
138 | { | |
815f62bf | 139 | unsigned short crc = 0xffff; |
1da177e4 | 140 | |
815f62bf RB |
141 | if (size < 3) |
142 | return -1; | |
1da177e4 | 143 | |
815f62bf RB |
144 | while (size--) |
145 | crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; | |
1da177e4 | 146 | |
815f62bf RB |
147 | if ((crc & 0xffff) != 0x7070) |
148 | return -1; | |
1da177e4 | 149 | |
815f62bf | 150 | return 0; |
1da177e4 LT |
151 | } |
152 | ||
5793f4be RB |
153 | static int check_crc_16(unsigned char *cp, int size) |
154 | { | |
155 | unsigned short crc = 0x0000; | |
156 | ||
157 | if (size < 3) | |
158 | return -1; | |
159 | ||
160 | crc = crc16(0, cp, size); | |
161 | ||
162 | if (crc != 0x0000) | |
163 | return -1; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
815f62bf RB |
168 | /* |
169 | * Standard encapsulation | |
170 | */ | |
1da177e4 | 171 | |
815f62bf | 172 | static int kiss_esc(unsigned char *s, unsigned char *d, int len) |
1da177e4 | 173 | { |
815f62bf RB |
174 | unsigned char *ptr = d; |
175 | unsigned char c; | |
1da177e4 | 176 | |
815f62bf RB |
177 | /* |
178 | * Send an initial END character to flush out any data that may have | |
179 | * accumulated in the receiver due to line noise. | |
180 | */ | |
1da177e4 | 181 | |
815f62bf | 182 | *ptr++ = END; |
1da177e4 | 183 | |
815f62bf RB |
184 | while (len-- > 0) { |
185 | switch (c = *s++) { | |
186 | case END: | |
187 | *ptr++ = ESC; | |
188 | *ptr++ = ESC_END; | |
1da177e4 | 189 | break; |
815f62bf RB |
190 | case ESC: |
191 | *ptr++ = ESC; | |
192 | *ptr++ = ESC_ESC; | |
193 | break; | |
194 | default: | |
195 | *ptr++ = c; | |
196 | break; | |
197 | } | |
1da177e4 LT |
198 | } |
199 | ||
815f62bf RB |
200 | *ptr++ = END; |
201 | ||
202 | return ptr - d; | |
203 | } | |
204 | ||
205 | /* | |
206 | * MW: | |
207 | * OK its ugly, but tell me a better solution without copying the | |
208 | * packet to a temporary buffer :-) | |
209 | */ | |
210 | static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc, | |
211 | int len) | |
212 | { | |
213 | unsigned char *ptr = d; | |
214 | unsigned char c=0; | |
215 | ||
216 | *ptr++ = END; | |
217 | while (len > 0) { | |
218 | if (len > 2) | |
219 | c = *s++; | |
220 | else if (len > 1) | |
221 | c = crc >> 8; | |
222 | else if (len > 0) | |
223 | c = crc & 0xff; | |
224 | ||
225 | len--; | |
1da177e4 | 226 | |
815f62bf RB |
227 | switch (c) { |
228 | case END: | |
229 | *ptr++ = ESC; | |
230 | *ptr++ = ESC_END; | |
231 | break; | |
232 | case ESC: | |
233 | *ptr++ = ESC; | |
234 | *ptr++ = ESC_ESC; | |
235 | break; | |
236 | default: | |
237 | *ptr++ = c; | |
238 | break; | |
239 | } | |
1da177e4 | 240 | } |
815f62bf RB |
241 | *ptr++ = END; |
242 | ||
243 | return ptr - d; | |
244 | } | |
245 | ||
246 | /* Send one completely decapsulated AX.25 packet to the AX.25 layer. */ | |
247 | static void ax_bump(struct mkiss *ax) | |
248 | { | |
249 | struct sk_buff *skb; | |
250 | int count; | |
251 | ||
252 | spin_lock_bh(&ax->buflock); | |
253 | if (ax->rbuff[0] > 0x0f) { | |
5793f4be RB |
254 | if (ax->rbuff[0] & 0x80) { |
255 | if (check_crc_16(ax->rbuff, ax->rcount) < 0) { | |
ddbe9a68 | 256 | ax->dev->stats.rx_errors++; |
5793f4be RB |
257 | spin_unlock_bh(&ax->buflock); |
258 | ||
259 | return; | |
260 | } | |
261 | if (ax->crcmode != CRC_MODE_SMACK && ax->crcauto) { | |
262 | printk(KERN_INFO | |
7b1401cf | 263 | "mkiss: %s: Switching to crc-smack\n", |
5793f4be RB |
264 | ax->dev->name); |
265 | ax->crcmode = CRC_MODE_SMACK; | |
266 | } | |
267 | ax->rcount -= 2; | |
268 | *ax->rbuff &= ~0x80; | |
269 | } else if (ax->rbuff[0] & 0x20) { | |
815f62bf | 270 | if (check_crc_flex(ax->rbuff, ax->rcount) < 0) { |
ddbe9a68 | 271 | ax->dev->stats.rx_errors++; |
5793f4be | 272 | spin_unlock_bh(&ax->buflock); |
815f62bf RB |
273 | return; |
274 | } | |
5793f4be RB |
275 | if (ax->crcmode != CRC_MODE_FLEX && ax->crcauto) { |
276 | printk(KERN_INFO | |
7b1401cf | 277 | "mkiss: %s: Switching to crc-flexnet\n", |
5793f4be RB |
278 | ax->dev->name); |
279 | ax->crcmode = CRC_MODE_FLEX; | |
280 | } | |
815f62bf | 281 | ax->rcount -= 2; |
5793f4be RB |
282 | |
283 | /* | |
284 | * dl9sau bugfix: the trailling two bytes flexnet crc | |
285 | * will not be passed to the kernel. thus we have to | |
286 | * correct the kissparm signature, because it indicates | |
287 | * a crc but there's none | |
815f62bf | 288 | */ |
5793f4be | 289 | *ax->rbuff &= ~0x20; |
1da177e4 | 290 | } |
815f62bf | 291 | } |
815f62bf RB |
292 | |
293 | count = ax->rcount; | |
294 | ||
295 | if ((skb = dev_alloc_skb(count)) == NULL) { | |
296 | printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", | |
297 | ax->dev->name); | |
ddbe9a68 | 298 | ax->dev->stats.rx_dropped++; |
9f30c768 | 299 | spin_unlock_bh(&ax->buflock); |
815f62bf | 300 | return; |
1da177e4 LT |
301 | } |
302 | ||
815f62bf | 303 | memcpy(skb_put(skb,count), ax->rbuff, count); |
815f62bf RB |
304 | skb->protocol = ax25_type_trans(skb, ax->dev); |
305 | netif_rx(skb); | |
ddbe9a68 SH |
306 | ax->dev->stats.rx_packets++; |
307 | ax->dev->stats.rx_bytes += count; | |
9f30c768 | 308 | spin_unlock_bh(&ax->buflock); |
1da177e4 LT |
309 | } |
310 | ||
815f62bf | 311 | static void kiss_unesc(struct mkiss *ax, unsigned char s) |
1da177e4 | 312 | { |
815f62bf RB |
313 | switch (s) { |
314 | case END: | |
315 | /* drop keeptest bit = VSV */ | |
316 | if (test_bit(AXF_KEEPTEST, &ax->flags)) | |
317 | clear_bit(AXF_KEEPTEST, &ax->flags); | |
318 | ||
319 | if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2)) | |
320 | ax_bump(ax); | |
321 | ||
322 | clear_bit(AXF_ESCAPE, &ax->flags); | |
323 | ax->rcount = 0; | |
324 | return; | |
325 | ||
326 | case ESC: | |
327 | set_bit(AXF_ESCAPE, &ax->flags); | |
328 | return; | |
329 | case ESC_ESC: | |
330 | if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) | |
331 | s = ESC; | |
332 | break; | |
333 | case ESC_END: | |
334 | if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) | |
335 | s = END; | |
336 | break; | |
337 | } | |
338 | ||
339 | spin_lock_bh(&ax->buflock); | |
340 | if (!test_bit(AXF_ERROR, &ax->flags)) { | |
341 | if (ax->rcount < ax->buffsize) { | |
342 | ax->rbuff[ax->rcount++] = s; | |
343 | spin_unlock_bh(&ax->buflock); | |
344 | return; | |
345 | } | |
346 | ||
ddbe9a68 | 347 | ax->dev->stats.rx_over_errors++; |
815f62bf RB |
348 | set_bit(AXF_ERROR, &ax->flags); |
349 | } | |
350 | spin_unlock_bh(&ax->buflock); | |
351 | } | |
352 | ||
353 | static int ax_set_mac_address(struct net_device *dev, void *addr) | |
354 | { | |
355 | struct sockaddr_ax25 *sa = addr; | |
356 | ||
932ff279 | 357 | netif_tx_lock_bh(dev); |
e308a5d8 | 358 | netif_addr_lock(dev); |
815f62bf | 359 | memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN); |
e308a5d8 | 360 | netif_addr_unlock(dev); |
932ff279 | 361 | netif_tx_unlock_bh(dev); |
815f62bf RB |
362 | |
363 | return 0; | |
1da177e4 LT |
364 | } |
365 | ||
815f62bf RB |
366 | /*---------------------------------------------------------------------------*/ |
367 | ||
368 | static void ax_changedmtu(struct mkiss *ax) | |
1da177e4 LT |
369 | { |
370 | struct net_device *dev = ax->dev; | |
371 | unsigned char *xbuff, *rbuff, *oxbuff, *orbuff; | |
372 | int len; | |
373 | ||
374 | len = dev->mtu * 2; | |
375 | ||
376 | /* | |
377 | * allow for arrival of larger UDP packets, even if we say not to | |
378 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
379 | * an MSS of 128 | |
380 | */ | |
381 | if (len < 576 * 2) | |
382 | len = 576 * 2; | |
383 | ||
384 | xbuff = kmalloc(len + 4, GFP_ATOMIC); | |
385 | rbuff = kmalloc(len + 4, GFP_ATOMIC); | |
386 | ||
387 | if (xbuff == NULL || rbuff == NULL) { | |
815f62bf RB |
388 | printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, " |
389 | "MTU change cancelled.\n", | |
1da177e4 LT |
390 | ax->dev->name); |
391 | dev->mtu = ax->mtu; | |
b4558ea9 JJ |
392 | kfree(xbuff); |
393 | kfree(rbuff); | |
1da177e4 LT |
394 | return; |
395 | } | |
396 | ||
397 | spin_lock_bh(&ax->buflock); | |
398 | ||
399 | oxbuff = ax->xbuff; | |
400 | ax->xbuff = xbuff; | |
401 | orbuff = ax->rbuff; | |
402 | ax->rbuff = rbuff; | |
403 | ||
404 | if (ax->xleft) { | |
405 | if (ax->xleft <= len) { | |
406 | memcpy(ax->xbuff, ax->xhead, ax->xleft); | |
407 | } else { | |
408 | ax->xleft = 0; | |
ddbe9a68 | 409 | dev->stats.tx_dropped++; |
1da177e4 LT |
410 | } |
411 | } | |
412 | ||
413 | ax->xhead = ax->xbuff; | |
414 | ||
415 | if (ax->rcount) { | |
416 | if (ax->rcount <= len) { | |
417 | memcpy(ax->rbuff, orbuff, ax->rcount); | |
418 | } else { | |
419 | ax->rcount = 0; | |
ddbe9a68 | 420 | dev->stats.rx_over_errors++; |
1da177e4 LT |
421 | set_bit(AXF_ERROR, &ax->flags); |
422 | } | |
423 | } | |
424 | ||
425 | ax->mtu = dev->mtu + 73; | |
426 | ax->buffsize = len; | |
427 | ||
428 | spin_unlock_bh(&ax->buflock); | |
429 | ||
815f62bf RB |
430 | kfree(oxbuff); |
431 | kfree(orbuff); | |
1da177e4 LT |
432 | } |
433 | ||
434 | /* Encapsulate one AX.25 packet and stuff into a TTY queue. */ | |
815f62bf | 435 | static void ax_encaps(struct net_device *dev, unsigned char *icp, int len) |
1da177e4 | 436 | { |
815f62bf | 437 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 LT |
438 | unsigned char *p; |
439 | int actual, count; | |
440 | ||
441 | if (ax->mtu != ax->dev->mtu + 73) /* Someone has been ifconfigging */ | |
442 | ax_changedmtu(ax); | |
443 | ||
444 | if (len > ax->mtu) { /* Sigh, shouldn't occur BUT ... */ | |
445 | len = ax->mtu; | |
446 | printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name); | |
ddbe9a68 | 447 | dev->stats.tx_dropped++; |
815f62bf | 448 | netif_start_queue(dev); |
1da177e4 LT |
449 | return; |
450 | } | |
451 | ||
452 | p = icp; | |
453 | ||
454 | spin_lock_bh(&ax->buflock); | |
5793f4be RB |
455 | if ((*p & 0x0f) != 0) { |
456 | /* Configuration Command (kissparms(1). | |
457 | * Protocol spec says: never append CRC. | |
458 | * This fixes a very old bug in the linux | |
459 | * kiss driver. -- dl9sau */ | |
460 | switch (*p & 0xff) { | |
461 | case 0x85: | |
462 | /* command from userspace especially for us, | |
463 | * not for delivery to the tnc */ | |
464 | if (len > 1) { | |
465 | int cmd = (p[1] & 0xff); | |
466 | switch(cmd) { | |
467 | case 3: | |
468 | ax->crcmode = CRC_MODE_SMACK; | |
469 | break; | |
470 | case 2: | |
471 | ax->crcmode = CRC_MODE_FLEX; | |
472 | break; | |
473 | case 1: | |
474 | ax->crcmode = CRC_MODE_NONE; | |
475 | break; | |
476 | case 0: | |
477 | default: | |
478 | ax->crcmode = CRC_MODE_SMACK_TEST; | |
479 | cmd = 0; | |
480 | } | |
481 | ax->crcauto = (cmd ? 0 : 1); | |
482 | printk(KERN_INFO "mkiss: %s: crc mode %s %d\n", ax->dev->name, (len) ? "set to" : "is", cmd); | |
483 | } | |
484 | spin_unlock_bh(&ax->buflock); | |
485 | netif_start_queue(dev); | |
1da177e4 | 486 | |
5793f4be RB |
487 | return; |
488 | default: | |
489 | count = kiss_esc(p, (unsigned char *)ax->xbuff, len); | |
490 | } | |
491 | } else { | |
492 | unsigned short crc; | |
493 | switch (ax->crcmode) { | |
494 | case CRC_MODE_SMACK_TEST: | |
495 | ax->crcmode = CRC_MODE_FLEX_TEST; | |
496 | printk(KERN_INFO "mkiss: %s: Trying crc-smack\n", ax->dev->name); | |
497 | // fall through | |
498 | case CRC_MODE_SMACK: | |
499 | *p |= 0x80; | |
500 | crc = swab16(crc16(0, p, len)); | |
501 | count = kiss_esc_crc(p, (unsigned char *)ax->xbuff, crc, len+2); | |
502 | break; | |
503 | case CRC_MODE_FLEX_TEST: | |
504 | ax->crcmode = CRC_MODE_NONE; | |
505 | printk(KERN_INFO "mkiss: %s: Trying crc-flexnet\n", ax->dev->name); | |
506 | // fall through | |
507 | case CRC_MODE_FLEX: | |
508 | *p |= 0x20; | |
509 | crc = calc_crc_flex(p, len); | |
510 | count = kiss_esc_crc(p, (unsigned char *)ax->xbuff, crc, len+2); | |
511 | break; | |
512 | ||
513 | default: | |
514 | count = kiss_esc(p, (unsigned char *)ax->xbuff, len); | |
515 | } | |
516 | } | |
c1854ebc | 517 | spin_unlock_bh(&ax->buflock); |
1da177e4 | 518 | |
815f62bf | 519 | set_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); |
f34d7a5b | 520 | actual = ax->tty->ops->write(ax->tty, ax->xbuff, count); |
ddbe9a68 SH |
521 | dev->stats.tx_packets++; |
522 | dev->stats.tx_bytes += actual; | |
815f62bf | 523 | |
1da177e4 LT |
524 | ax->dev->trans_start = jiffies; |
525 | ax->xleft = count - actual; | |
526 | ax->xhead = ax->xbuff + actual; | |
1da177e4 LT |
527 | } |
528 | ||
1da177e4 | 529 | /* Encapsulate an AX.25 packet and kick it into a TTY queue. */ |
36e4d64a | 530 | static netdev_tx_t ax_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 531 | { |
815f62bf | 532 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 LT |
533 | |
534 | if (!netif_running(dev)) { | |
535 | printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name); | |
5b548140 | 536 | return NETDEV_TX_BUSY; |
1da177e4 LT |
537 | } |
538 | ||
539 | if (netif_queue_stopped(dev)) { | |
540 | /* | |
541 | * May be we must check transmitter timeout here ? | |
542 | * 14 Oct 1994 Dmitry Gorodchanin. | |
543 | */ | |
cd8749b4 | 544 | if (time_before(jiffies, dev->trans_start + 20 * HZ)) { |
1da177e4 | 545 | /* 20 sec timeout not reached */ |
5b548140 | 546 | return NETDEV_TX_BUSY; |
1da177e4 LT |
547 | } |
548 | ||
549 | printk(KERN_ERR "mkiss: %s: transmit timed out, %s?\n", dev->name, | |
5608784f | 550 | (tty_chars_in_buffer(ax->tty) || ax->xleft) ? |
1da177e4 LT |
551 | "bad line quality" : "driver error"); |
552 | ||
553 | ax->xleft = 0; | |
815f62bf RB |
554 | clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); |
555 | netif_start_queue(dev); | |
1da177e4 LT |
556 | } |
557 | ||
558 | /* We were not busy, so we are now... :-) */ | |
559 | if (skb != NULL) { | |
815f62bf RB |
560 | netif_stop_queue(dev); |
561 | ax_encaps(dev, skb->data, skb->len); | |
1da177e4 LT |
562 | kfree_skb(skb); |
563 | } | |
564 | ||
6ed10654 | 565 | return NETDEV_TX_OK; |
1da177e4 LT |
566 | } |
567 | ||
815f62bf RB |
568 | static int ax_open_dev(struct net_device *dev) |
569 | { | |
570 | struct mkiss *ax = netdev_priv(dev); | |
571 | ||
572 | if (ax->tty == NULL) | |
573 | return -ENODEV; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
1da177e4 LT |
578 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
579 | ||
580 | /* Return the frame type ID */ | |
3b04ddde SH |
581 | static int ax_header(struct sk_buff *skb, struct net_device *dev, |
582 | unsigned short type, const void *daddr, | |
583 | const void *saddr, unsigned len) | |
1da177e4 LT |
584 | { |
585 | #ifdef CONFIG_INET | |
d9a19d20 | 586 | if (type != ETH_P_AX25) |
6f74998e | 587 | return ax25_hard_header(skb, dev, type, daddr, saddr, len); |
1da177e4 LT |
588 | #endif |
589 | return 0; | |
590 | } | |
591 | ||
592 | ||
593 | static int ax_rebuild_header(struct sk_buff *skb) | |
594 | { | |
595 | #ifdef CONFIG_INET | |
596 | return ax25_rebuild_header(skb); | |
597 | #else | |
598 | return 0; | |
599 | #endif | |
600 | } | |
601 | ||
602 | #endif /* CONFIG_{AX25,AX25_MODULE} */ | |
603 | ||
604 | /* Open the low-level part of the AX25 channel. Easy! */ | |
605 | static int ax_open(struct net_device *dev) | |
606 | { | |
815f62bf | 607 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 LT |
608 | unsigned long len; |
609 | ||
610 | if (ax->tty == NULL) | |
611 | return -ENODEV; | |
612 | ||
613 | /* | |
614 | * Allocate the frame buffers: | |
615 | * | |
616 | * rbuff Receive buffer. | |
617 | * xbuff Transmit buffer. | |
618 | */ | |
619 | len = dev->mtu * 2; | |
620 | ||
621 | /* | |
622 | * allow for arrival of larger UDP packets, even if we say not to | |
623 | * also fixes a bug in which SunOS sends 512-byte packets even with | |
624 | * an MSS of 128 | |
625 | */ | |
626 | if (len < 576 * 2) | |
627 | len = 576 * 2; | |
628 | ||
629 | if ((ax->rbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL) | |
630 | goto norbuff; | |
631 | ||
632 | if ((ax->xbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL) | |
633 | goto noxbuff; | |
634 | ||
635 | ax->mtu = dev->mtu + 73; | |
636 | ax->buffsize = len; | |
637 | ax->rcount = 0; | |
638 | ax->xleft = 0; | |
639 | ||
640 | ax->flags &= (1 << AXF_INUSE); /* Clear ESCAPE & ERROR flags */ | |
641 | ||
642 | spin_lock_init(&ax->buflock); | |
643 | ||
1da177e4 LT |
644 | return 0; |
645 | ||
646 | noxbuff: | |
647 | kfree(ax->rbuff); | |
648 | ||
649 | norbuff: | |
650 | return -ENOMEM; | |
651 | } | |
652 | ||
653 | ||
654 | /* Close the low-level part of the AX25 channel. Easy! */ | |
655 | static int ax_close(struct net_device *dev) | |
656 | { | |
815f62bf | 657 | struct mkiss *ax = netdev_priv(dev); |
1da177e4 | 658 | |
815f62bf RB |
659 | if (ax->tty) |
660 | clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); | |
1da177e4 LT |
661 | |
662 | netif_stop_queue(dev); | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
3b04ddde SH |
667 | static const struct header_ops ax_header_ops = { |
668 | .create = ax_header, | |
669 | .rebuild = ax_rebuild_header, | |
670 | }; | |
671 | ||
6095e081 SH |
672 | static const struct net_device_ops ax_netdev_ops = { |
673 | .ndo_open = ax_open_dev, | |
674 | .ndo_stop = ax_close, | |
675 | .ndo_start_xmit = ax_xmit, | |
676 | .ndo_set_mac_address = ax_set_mac_address, | |
677 | }; | |
678 | ||
815f62bf RB |
679 | static void ax_setup(struct net_device *dev) |
680 | { | |
815f62bf RB |
681 | /* Finish setting up the DEVICE info. */ |
682 | dev->mtu = AX_MTU; | |
815f62bf RB |
683 | dev->hard_header_len = 0; |
684 | dev->addr_len = 0; | |
685 | dev->type = ARPHRD_AX25; | |
686 | dev->tx_queue_len = 10; | |
3b04ddde | 687 | dev->header_ops = &ax_header_ops; |
6095e081 | 688 | dev->netdev_ops = &ax_netdev_ops; |
3b04ddde | 689 | |
815f62bf | 690 | |
15b1c0e8 RB |
691 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
692 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
815f62bf RB |
693 | |
694 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; | |
1da177e4 LT |
695 | } |
696 | ||
697 | /* | |
815f62bf RB |
698 | * We have a potential race on dereferencing tty->disc_data, because the tty |
699 | * layer provides no locking at all - thus one cpu could be running | |
700 | * sixpack_receive_buf while another calls sixpack_close, which zeroes | |
701 | * tty->disc_data and frees the memory that sixpack_receive_buf is using. The | |
702 | * best way to fix this is to use a rwlock in the tty struct, but for now we | |
703 | * use a single global rwlock for all ttys in ppp line discipline. | |
1da177e4 | 704 | */ |
d5919586 | 705 | static DEFINE_RWLOCK(disc_data_lock); |
815f62bf RB |
706 | |
707 | static struct mkiss *mkiss_get(struct tty_struct *tty) | |
1da177e4 | 708 | { |
815f62bf | 709 | struct mkiss *ax; |
1da177e4 | 710 | |
815f62bf RB |
711 | read_lock(&disc_data_lock); |
712 | ax = tty->disc_data; | |
713 | if (ax) | |
714 | atomic_inc(&ax->refcnt); | |
715 | read_unlock(&disc_data_lock); | |
1da177e4 | 716 | |
815f62bf RB |
717 | return ax; |
718 | } | |
1da177e4 | 719 | |
815f62bf RB |
720 | static void mkiss_put(struct mkiss *ax) |
721 | { | |
722 | if (atomic_dec_and_test(&ax->refcnt)) | |
723 | up(&ax->dead_sem); | |
1da177e4 LT |
724 | } |
725 | ||
5793f4be RB |
726 | static int crc_force = 0; /* Can be overridden with insmod */ |
727 | ||
815f62bf | 728 | static int mkiss_open(struct tty_struct *tty) |
1da177e4 | 729 | { |
815f62bf RB |
730 | struct net_device *dev; |
731 | struct mkiss *ax; | |
1da177e4 LT |
732 | int err; |
733 | ||
815f62bf RB |
734 | if (!capable(CAP_NET_ADMIN)) |
735 | return -EPERM; | |
f34d7a5b AC |
736 | if (tty->ops->write == NULL) |
737 | return -EOPNOTSUPP; | |
1da177e4 | 738 | |
815f62bf RB |
739 | dev = alloc_netdev(sizeof(struct mkiss), "ax%d", ax_setup); |
740 | if (!dev) { | |
741 | err = -ENOMEM; | |
742 | goto out; | |
743 | } | |
744 | ||
745 | ax = netdev_priv(dev); | |
746 | ax->dev = dev; | |
747 | ||
748 | spin_lock_init(&ax->buflock); | |
749 | atomic_set(&ax->refcnt, 1); | |
495e64bd | 750 | sema_init(&ax->dead_sem, 0); |
1da177e4 LT |
751 | |
752 | ax->tty = tty; | |
753 | tty->disc_data = ax; | |
33f0f88f | 754 | tty->receive_room = 65535; |
1da177e4 | 755 | |
f34d7a5b | 756 | tty_driver_flush_buffer(tty); |
1da177e4 LT |
757 | |
758 | /* Restore default settings */ | |
815f62bf | 759 | dev->type = ARPHRD_AX25; |
1da177e4 LT |
760 | |
761 | /* Perform the low-level AX25 initialization. */ | |
815f62bf RB |
762 | if ((err = ax_open(ax->dev))) { |
763 | goto out_free_netdev; | |
764 | } | |
1da177e4 | 765 | |
815f62bf RB |
766 | if (register_netdev(dev)) |
767 | goto out_free_buffers; | |
1da177e4 | 768 | |
5793f4be RB |
769 | /* after register_netdev() - because else printk smashes the kernel */ |
770 | switch (crc_force) { | |
771 | case 3: | |
772 | ax->crcmode = CRC_MODE_SMACK; | |
773 | printk(KERN_INFO "mkiss: %s: crc mode smack forced.\n", | |
774 | ax->dev->name); | |
775 | break; | |
776 | case 2: | |
777 | ax->crcmode = CRC_MODE_FLEX; | |
778 | printk(KERN_INFO "mkiss: %s: crc mode flexnet forced.\n", | |
779 | ax->dev->name); | |
780 | break; | |
781 | case 1: | |
782 | ax->crcmode = CRC_MODE_NONE; | |
783 | printk(KERN_INFO "mkiss: %s: crc mode disabled.\n", | |
784 | ax->dev->name); | |
785 | break; | |
786 | case 0: | |
787 | /* fall through */ | |
788 | default: | |
789 | crc_force = 0; | |
790 | printk(KERN_INFO "mkiss: %s: crc mode is auto.\n", | |
791 | ax->dev->name); | |
792 | ax->crcmode = CRC_MODE_SMACK_TEST; | |
793 | } | |
794 | ax->crcauto = (crc_force ? 0 : 1); | |
795 | ||
815f62bf | 796 | netif_start_queue(dev); |
1da177e4 | 797 | |
815f62bf RB |
798 | /* Done. We have linked the TTY line to a channel. */ |
799 | return 0; | |
1da177e4 | 800 | |
815f62bf RB |
801 | out_free_buffers: |
802 | kfree(ax->rbuff); | |
803 | kfree(ax->xbuff); | |
1da177e4 | 804 | |
815f62bf RB |
805 | out_free_netdev: |
806 | free_netdev(dev); | |
1da177e4 | 807 | |
815f62bf RB |
808 | out: |
809 | return err; | |
1da177e4 LT |
810 | } |
811 | ||
815f62bf | 812 | static void mkiss_close(struct tty_struct *tty) |
1da177e4 | 813 | { |
815f62bf | 814 | struct mkiss *ax; |
1da177e4 | 815 | |
6e4e2f81 | 816 | write_lock_bh(&disc_data_lock); |
815f62bf RB |
817 | ax = tty->disc_data; |
818 | tty->disc_data = NULL; | |
6e4e2f81 | 819 | write_unlock_bh(&disc_data_lock); |
1da177e4 | 820 | |
79ea13ce | 821 | if (!ax) |
815f62bf | 822 | return; |
1da177e4 LT |
823 | |
824 | /* | |
815f62bf RB |
825 | * We have now ensured that nobody can start using ap from now on, but |
826 | * we have to wait for all existing users to finish. | |
1da177e4 | 827 | */ |
815f62bf RB |
828 | if (!atomic_dec_and_test(&ax->refcnt)) |
829 | down(&ax->dead_sem); | |
1da177e4 | 830 | |
815f62bf | 831 | unregister_netdev(ax->dev); |
1da177e4 | 832 | |
815f62bf RB |
833 | /* Free all AX25 frame buffers. */ |
834 | kfree(ax->rbuff); | |
835 | kfree(ax->xbuff); | |
1da177e4 | 836 | |
815f62bf | 837 | ax->tty = NULL; |
1da177e4 LT |
838 | } |
839 | ||
815f62bf RB |
840 | /* Perform I/O control on an active ax25 channel. */ |
841 | static int mkiss_ioctl(struct tty_struct *tty, struct file *file, | |
842 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 843 | { |
815f62bf | 844 | struct mkiss *ax = mkiss_get(tty); |
f40e0638 | 845 | struct net_device *dev; |
815f62bf | 846 | unsigned int tmp, err; |
1da177e4 | 847 | |
815f62bf RB |
848 | /* First make sure we're connected. */ |
849 | if (ax == NULL) | |
850 | return -ENXIO; | |
f40e0638 | 851 | dev = ax->dev; |
1da177e4 | 852 | |
815f62bf RB |
853 | switch (cmd) { |
854 | case SIOCGIFNAME: | |
855 | err = copy_to_user((void __user *) arg, ax->dev->name, | |
856 | strlen(ax->dev->name) + 1) ? -EFAULT : 0; | |
857 | break; | |
858 | ||
859 | case SIOCGIFENCAP: | |
860 | err = put_user(4, (int __user *) arg); | |
861 | break; | |
862 | ||
863 | case SIOCSIFENCAP: | |
864 | if (get_user(tmp, (int __user *) arg)) { | |
865 | err = -EFAULT; | |
866 | break; | |
1da177e4 | 867 | } |
1da177e4 | 868 | |
815f62bf RB |
869 | ax->mode = tmp; |
870 | dev->addr_len = AX25_ADDR_LEN; | |
871 | dev->hard_header_len = AX25_KISS_HEADER_LEN + | |
872 | AX25_MAX_HEADER_LEN + 3; | |
873 | dev->type = ARPHRD_AX25; | |
1da177e4 | 874 | |
815f62bf RB |
875 | err = 0; |
876 | break; | |
1da177e4 | 877 | |
815f62bf RB |
878 | case SIOCSIFHWADDR: { |
879 | char addr[AX25_ADDR_LEN]; | |
1da177e4 | 880 | |
815f62bf RB |
881 | if (copy_from_user(&addr, |
882 | (void __user *) arg, AX25_ADDR_LEN)) { | |
883 | err = -EFAULT; | |
1da177e4 | 884 | break; |
1da177e4 LT |
885 | } |
886 | ||
932ff279 | 887 | netif_tx_lock_bh(dev); |
815f62bf | 888 | memcpy(dev->dev_addr, addr, AX25_ADDR_LEN); |
932ff279 | 889 | netif_tx_unlock_bh(dev); |
815f62bf RB |
890 | |
891 | err = 0; | |
892 | break; | |
893 | } | |
894 | default: | |
895 | err = -ENOIOCTLCMD; | |
1da177e4 | 896 | } |
1da177e4 | 897 | |
815f62bf | 898 | mkiss_put(ax); |
1da177e4 | 899 | |
815f62bf | 900 | return err; |
1da177e4 LT |
901 | } |
902 | ||
9646e7ce AB |
903 | #ifdef CONFIG_COMPAT |
904 | static long mkiss_compat_ioctl(struct tty_struct *tty, struct file *file, | |
905 | unsigned int cmd, unsigned long arg) | |
906 | { | |
07c3c4ee | 907 | switch (cmd) { |
9646e7ce AB |
908 | case SIOCGIFNAME: |
909 | case SIOCGIFENCAP: | |
910 | case SIOCSIFENCAP: | |
911 | case SIOCSIFHWADDR: | |
912 | return mkiss_ioctl(tty, file, cmd, | |
913 | (unsigned long)compat_ptr(arg)); | |
914 | } | |
915 | ||
916 | return -ENOIOCTLCMD; | |
917 | } | |
918 | #endif | |
919 | ||
815f62bf RB |
920 | /* |
921 | * Handle the 'receiver data ready' interrupt. | |
922 | * This function is called by the 'tty_io' module in the kernel when | |
923 | * a block of data has been received, which can now be decapsulated | |
924 | * and sent on to the AX.25 layer for further processing. | |
925 | */ | |
55db4c64 LT |
926 | static void mkiss_receive_buf(struct tty_struct *tty, const unsigned char *cp, |
927 | char *fp, int count) | |
1da177e4 | 928 | { |
815f62bf | 929 | struct mkiss *ax = mkiss_get(tty); |
1da177e4 | 930 | |
815f62bf | 931 | if (!ax) |
55db4c64 | 932 | return; |
1da177e4 | 933 | |
815f62bf RB |
934 | /* |
935 | * Argh! mtu change time! - costs us the packet part received | |
936 | * at the change | |
937 | */ | |
938 | if (ax->mtu != ax->dev->mtu + 73) | |
939 | ax_changedmtu(ax); | |
1da177e4 | 940 | |
815f62bf | 941 | /* Read the characters out of the buffer */ |
55db4c64 | 942 | while (count--) { |
815f62bf RB |
943 | if (fp != NULL && *fp++) { |
944 | if (!test_and_set_bit(AXF_ERROR, &ax->flags)) | |
ddbe9a68 | 945 | ax->dev->stats.rx_errors++; |
815f62bf RB |
946 | cp++; |
947 | continue; | |
948 | } | |
1da177e4 | 949 | |
815f62bf | 950 | kiss_unesc(ax, *cp++); |
1da177e4 | 951 | } |
815f62bf RB |
952 | |
953 | mkiss_put(ax); | |
39c2e60f | 954 | tty_unthrottle(tty); |
1da177e4 LT |
955 | } |
956 | ||
815f62bf RB |
957 | /* |
958 | * Called by the driver when there's room for more data. If we have | |
959 | * more packets to send, we send them here. | |
960 | */ | |
961 | static void mkiss_write_wakeup(struct tty_struct *tty) | |
1da177e4 | 962 | { |
815f62bf RB |
963 | struct mkiss *ax = mkiss_get(tty); |
964 | int actual; | |
1da177e4 | 965 | |
815f62bf RB |
966 | if (!ax) |
967 | return; | |
1da177e4 | 968 | |
815f62bf RB |
969 | if (ax->xleft <= 0) { |
970 | /* Now serial buffer is almost free & we can start | |
971 | * transmission of another packet | |
972 | */ | |
973 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
1da177e4 | 974 | |
815f62bf RB |
975 | netif_wake_queue(ax->dev); |
976 | goto out; | |
977 | } | |
1da177e4 | 978 | |
f34d7a5b | 979 | actual = tty->ops->write(tty, ax->xhead, ax->xleft); |
815f62bf RB |
980 | ax->xleft -= actual; |
981 | ax->xhead += actual; | |
1da177e4 | 982 | |
815f62bf RB |
983 | out: |
984 | mkiss_put(ax); | |
1da177e4 LT |
985 | } |
986 | ||
a352def2 | 987 | static struct tty_ldisc_ops ax_ldisc = { |
74cfe03f | 988 | .owner = THIS_MODULE, |
815f62bf RB |
989 | .magic = TTY_LDISC_MAGIC, |
990 | .name = "mkiss", | |
991 | .open = mkiss_open, | |
992 | .close = mkiss_close, | |
993 | .ioctl = mkiss_ioctl, | |
9646e7ce AB |
994 | #ifdef CONFIG_COMPAT |
995 | .compat_ioctl = mkiss_compat_ioctl, | |
996 | #endif | |
815f62bf | 997 | .receive_buf = mkiss_receive_buf, |
815f62bf RB |
998 | .write_wakeup = mkiss_write_wakeup |
999 | }; | |
1da177e4 | 1000 | |
eb33ae24 | 1001 | static const char banner[] __initdata = KERN_INFO \ |
815f62bf | 1002 | "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n"; |
eb33ae24 | 1003 | static const char msg_regfail[] __initdata = KERN_ERR \ |
815f62bf | 1004 | "mkiss: can't register line discipline (err = %d)\n"; |
1da177e4 LT |
1005 | |
1006 | static int __init mkiss_init_driver(void) | |
1007 | { | |
1008 | int status; | |
1009 | ||
1010 | printk(banner); | |
1011 | ||
eb33ae24 HE |
1012 | status = tty_register_ldisc(N_AX25, &ax_ldisc); |
1013 | if (status != 0) | |
1014 | printk(msg_regfail, status); | |
1da177e4 | 1015 | |
1da177e4 LT |
1016 | return status; |
1017 | } | |
1018 | ||
815f62bf RB |
1019 | static const char msg_unregfail[] __exitdata = KERN_ERR \ |
1020 | "mkiss: can't unregister line discipline (err = %d)\n"; | |
1021 | ||
1da177e4 LT |
1022 | static void __exit mkiss_exit_driver(void) |
1023 | { | |
815f62bf | 1024 | int ret; |
1da177e4 | 1025 | |
815f62bf RB |
1026 | if ((ret = tty_unregister_ldisc(N_AX25))) |
1027 | printk(msg_unregfail, ret); | |
1da177e4 LT |
1028 | } |
1029 | ||
815f62bf | 1030 | MODULE_AUTHOR("Ralf Baechle DL5RB <ralf@linux-mips.org>"); |
1da177e4 | 1031 | MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs"); |
8d3b33f6 | 1032 | module_param(crc_force, int, 0); |
5793f4be | 1033 | MODULE_PARM_DESC(crc_force, "crc [0 = auto | 1 = none | 2 = flexnet | 3 = smack]"); |
1da177e4 LT |
1034 | MODULE_LICENSE("GPL"); |
1035 | MODULE_ALIAS_LDISC(N_AX25); | |
815f62bf | 1036 | |
1da177e4 LT |
1037 | module_init(mkiss_init_driver); |
1038 | module_exit(mkiss_exit_driver); |