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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / net / rose / rose_subr.c
blob4c3f3c7f08a888faa2fad5fc37e310901023eae4
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.h>
12 #include <linux/in.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/timer.h>
16 #include <linux/string.h>
17 #include <linux/sockios.h>
18 #include <linux/net.h>
19 #include <net/ax25.h>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <net/sock.h>
24 #include <net/tcp.h>
25 #include <asm/system.h>
26 #include <linux/fcntl.h>
27 #include <linux/mm.h>
28 #include <linux/interrupt.h>
29 #include <net/rose.h>
30
31 /*
32 * This routine purges all of the queues of frames.
33 */
34 void rose_clear_queues(struct sock *sk)
35 {
36 skb_queue_purge(&sk->sk_write_queue);
37 skb_queue_purge(&rose_sk(sk)->ack_queue);
38 }
39
40 /*
41 * This routine purges the input queue of those frames that have been
42 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
43 * SDL diagram.
44 */
45 void rose_frames_acked(struct sock *sk, unsigned short nr)
46 {
47 struct sk_buff *skb;
48 rose_cb *rose = rose_sk(sk);
49
50 /*
51 * Remove all the ack-ed frames from the ack queue.
52 */
53 if (rose->va != nr) {
54 while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
55 skb = skb_dequeue(&rose->ack_queue);
56 kfree_skb(skb);
57 rose->va = (rose->va + 1) % ROSE_MODULUS;
58 }
59 }
60 }
61
62 void rose_requeue_frames(struct sock *sk)
63 {
64 struct sk_buff *skb, *skb_prev = NULL;
65
66 /*
67 * Requeue all the un-ack-ed frames on the output queue to be picked
68 * up by rose_kick. This arrangement handles the possibility of an
69 * empty output queue.
70 */
71 while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
72 if (skb_prev == NULL)
73 skb_queue_head(&sk->sk_write_queue, skb);
74 else
75 skb_append(skb_prev, skb);
76 skb_prev = skb;
77 }
78 }
79
80 /*
81 * Validate that the value of nr is between va and vs. Return true or
82 * false for testing.
83 */
84 int rose_validate_nr(struct sock *sk, unsigned short nr)
85 {
86 rose_cb *rose = rose_sk(sk);
87 unsigned short vc = rose->va;
88
89 while (vc != rose->vs) {
90 if (nr == vc) return 1;
91 vc = (vc + 1) % ROSE_MODULUS;
92 }
93
94 return nr == rose->vs;
95 }
96
97 /*
98 * This routine is called when the packet layer internally generates a
99 * control frame.
100 */
101 void rose_write_internal(struct sock *sk, int frametype)
102 {
103 rose_cb *rose = rose_sk(sk);
104 struct sk_buff *skb;
105 unsigned char *dptr;
106 unsigned char lci1, lci2;
107 char buffer[100];
108 int len, faclen = 0;
109
110 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
111
112 switch (frametype) {
113 case ROSE_CALL_REQUEST:
114 len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
115 faclen = rose_create_facilities(buffer, rose);
116 len += faclen;
117 break;
118 case ROSE_CALL_ACCEPTED:
119 case ROSE_CLEAR_REQUEST:
120 case ROSE_RESET_REQUEST:
121 len += 2;
122 break;
123 }
124
125 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
126 return;
127
128 /*
129 * Space for AX.25 header and PID.
130 */
131 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);
132
133 dptr = skb_put(skb, skb_tailroom(skb));
134
135 lci1 = (rose->lci >> 8) & 0x0F;
136 lci2 = (rose->lci >> 0) & 0xFF;
137
138 switch (frametype) {
139 case ROSE_CALL_REQUEST:
140 *dptr++ = ROSE_GFI | lci1;
141 *dptr++ = lci2;
142 *dptr++ = frametype;
143 *dptr++ = 0xAA;
144 memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN);
145 dptr += ROSE_ADDR_LEN;
146 memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
147 dptr += ROSE_ADDR_LEN;
148 memcpy(dptr, buffer, faclen);
149 dptr += faclen;
150 break;
151
152 case ROSE_CALL_ACCEPTED:
153 *dptr++ = ROSE_GFI | lci1;
154 *dptr++ = lci2;
155 *dptr++ = frametype;
156 *dptr++ = 0x00; /* Address length */
157 *dptr++ = 0; /* Facilities length */
158 break;
159
160 case ROSE_CLEAR_REQUEST:
161 *dptr++ = ROSE_GFI | lci1;
162 *dptr++ = lci2;
163 *dptr++ = frametype;
164 *dptr++ = rose->cause;
165 *dptr++ = rose->diagnostic;
166 break;
167
168 case ROSE_RESET_REQUEST:
169 *dptr++ = ROSE_GFI | lci1;
170 *dptr++ = lci2;
171 *dptr++ = frametype;
172 *dptr++ = ROSE_DTE_ORIGINATED;
173 *dptr++ = 0;
174 break;
175
176 case ROSE_RR:
177 case ROSE_RNR:
178 *dptr++ = ROSE_GFI | lci1;
179 *dptr++ = lci2;
180 *dptr = frametype;
181 *dptr++ |= (rose->vr << 5) & 0xE0;
182 break;
183
184 case ROSE_CLEAR_CONFIRMATION:
185 case ROSE_RESET_CONFIRMATION:
186 *dptr++ = ROSE_GFI | lci1;
187 *dptr++ = lci2;
188 *dptr++ = frametype;
189 break;
190
191 default:
192 printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
193 kfree_skb(skb);
194 return;
195 }
196
197 rose_transmit_link(skb, rose->neighbour);
198 }
199
200 int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
201 {
202 unsigned char *frame;
203
204 frame = skb->data;
205
206 *ns = *nr = *q = *d = *m = 0;
207
208 switch (frame[2]) {
209 case ROSE_CALL_REQUEST:
210 case ROSE_CALL_ACCEPTED:
211 case ROSE_CLEAR_REQUEST:
212 case ROSE_CLEAR_CONFIRMATION:
213 case ROSE_RESET_REQUEST:
214 case ROSE_RESET_CONFIRMATION:
215 return frame[2];
216 default:
217 break;
218 }
219
220 if ((frame[2] & 0x1F) == ROSE_RR ||
221 (frame[2] & 0x1F) == ROSE_RNR) {
222 *nr = (frame[2] >> 5) & 0x07;
223 return frame[2] & 0x1F;
224 }
225
226 if ((frame[2] & 0x01) == ROSE_DATA) {
227 *q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
228 *d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
229 *m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
230 *nr = (frame[2] >> 5) & 0x07;
231 *ns = (frame[2] >> 1) & 0x07;
232 return ROSE_DATA;
233 }
234
235 return ROSE_ILLEGAL;
236 }
237
238 static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
239 {
240 unsigned char *pt;
241 unsigned char l, lg, n = 0;
242 int fac_national_digis_received = 0;
243
244 do {
245 switch (*p & 0xC0) {
246 case 0x00:
247 p += 2;
248 n += 2;
249 len -= 2;
250 break;
251
252 case 0x40:
253 if (*p == FAC_NATIONAL_RAND)
254 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
255 p += 3;
256 n += 3;
257 len -= 3;
258 break;
259
260 case 0x80:
261 p += 4;
262 n += 4;
263 len -= 4;
264 break;
265
266 case 0xC0:
267 l = p[1];
268 if (*p == FAC_NATIONAL_DEST_DIGI) {
269 if (!fac_national_digis_received) {
270 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
271 facilities->source_ndigis = 1;
272 }
273 }
274 else if (*p == FAC_NATIONAL_SRC_DIGI) {
275 if (!fac_national_digis_received) {
276 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
277 facilities->dest_ndigis = 1;
278 }
279 }
280 else if (*p == FAC_NATIONAL_FAIL_CALL) {
281 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
282 }
283 else if (*p == FAC_NATIONAL_FAIL_ADD) {
284 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
285 }
286 else if (*p == FAC_NATIONAL_DIGIS) {
287 fac_national_digis_received = 1;
288 facilities->source_ndigis = 0;
289 facilities->dest_ndigis = 0;
290 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
291 if (pt[6] & AX25_HBIT)
292 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
293 else
294 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
295 }
296 }
297 p += l + 2;
298 n += l + 2;
299 len -= l + 2;
300 break;
301 }
302 } while (*p != 0x00 && len > 0);
303
304 return n;
305 }
306
307 static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
308 {
309 unsigned char l, n = 0;
310 char callsign[11];
311
312 do {
313 switch (*p & 0xC0) {
314 case 0x00:
315 p += 2;
316 n += 2;
317 len -= 2;
318 break;
319
320 case 0x40:
321 p += 3;
322 n += 3;
323 len -= 3;
324 break;
325
326 case 0x80:
327 p += 4;
328 n += 4;
329 len -= 4;
330 break;
331
332 case 0xC0:
333 l = p[1];
334 if (*p == FAC_CCITT_DEST_NSAP) {
335 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
336 memcpy(callsign, p + 12, l - 10);
337 callsign[l - 10] = '\0';
338 facilities->source_call = *asc2ax(callsign);
339 }
340 if (*p == FAC_CCITT_SRC_NSAP) {
341 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
342 memcpy(callsign, p + 12, l - 10);
343 callsign[l - 10] = '\0';
344 facilities->dest_call = *asc2ax(callsign);
345 }
346 p += l + 2;
347 n += l + 2;
348 len -= l + 2;
349 break;
350 }
351 } while (*p != 0x00 && len > 0);
352
353 return n;
354 }
355
356 int rose_parse_facilities(unsigned char *p,
357 struct rose_facilities_struct *facilities)
358 {
359 int facilities_len, len;
360
361 facilities_len = *p++;
362
363 if (facilities_len == 0)
364 return 0;
365
366 while (facilities_len > 0) {
367 if (*p == 0x00) {
368 facilities_len--;
369 p++;
370
371 switch (*p) {
372 case FAC_NATIONAL: /* National */
373 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
374 facilities_len -= len + 1;
375 p += len + 1;
376 break;
377
378 case FAC_CCITT: /* CCITT */
379 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
380 facilities_len -= len + 1;
381 p += len + 1;
382 break;
383
384 default:
385 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
386 facilities_len--;
387 p++;
388 break;
389 }
390 } else
391 break; /* Error in facilities format */
392 }
393
394 return 1;
395 }
396
397 int rose_create_facilities(unsigned char *buffer, rose_cb *rose)
398 {
399 unsigned char *p = buffer + 1;
400 char *callsign;
401 int len, nb;
402
403 /* National Facilities */
404 if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
405 *p++ = 0x00;
406 *p++ = FAC_NATIONAL;
407
408 if (rose->rand != 0) {
409 *p++ = FAC_NATIONAL_RAND;
410 *p++ = (rose->rand >> 8) & 0xFF;
411 *p++ = (rose->rand >> 0) & 0xFF;
412 }
413
414 /* Sent before older facilities */
415 if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
416 int maxdigi = 0;
417 *p++ = FAC_NATIONAL_DIGIS;
418 *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
419 for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
420 if (++maxdigi >= ROSE_MAX_DIGIS)
421 break;
422 memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
423 p[6] |= AX25_HBIT;
424 p += AX25_ADDR_LEN;
425 }
426 for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
427 if (++maxdigi >= ROSE_MAX_DIGIS)
428 break;
429 memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
430 p[6] &= ~AX25_HBIT;
431 p += AX25_ADDR_LEN;
432 }
433 }
434
435 /* For compatibility */
436 if (rose->source_ndigis > 0) {
437 *p++ = FAC_NATIONAL_SRC_DIGI;
438 *p++ = AX25_ADDR_LEN;
439 memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
440 p += AX25_ADDR_LEN;
441 }
442
443 /* For compatibility */
444 if (rose->dest_ndigis > 0) {
445 *p++ = FAC_NATIONAL_DEST_DIGI;
446 *p++ = AX25_ADDR_LEN;
447 memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
448 p += AX25_ADDR_LEN;
449 }
450 }
451
452 *p++ = 0x00;
453 *p++ = FAC_CCITT;
454
455 *p++ = FAC_CCITT_DEST_NSAP;
456
457 callsign = ax2asc(&rose->dest_call);
458
459 *p++ = strlen(callsign) + 10;
460 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
461
462 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
463 *p++ = ROSE_ADDR_LEN * 2;
464 memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
465 p += ROSE_ADDR_LEN;
466
467 memcpy(p, callsign, strlen(callsign));
468 p += strlen(callsign);
469
470 *p++ = FAC_CCITT_SRC_NSAP;
471
472 callsign = ax2asc(&rose->source_call);
473
474 *p++ = strlen(callsign) + 10;
475 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
476
477 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
478 *p++ = ROSE_ADDR_LEN * 2;
479 memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
480 p += ROSE_ADDR_LEN;
481
482 memcpy(p, callsign, strlen(callsign));
483 p += strlen(callsign);
484
485 len = p - buffer;
486 buffer[0] = len - 1;
487
488 return len;
489 }
490
491 void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
492 {
493 rose_cb *rose = rose_sk(sk);
494
495 rose_stop_timer(sk);
496 rose_stop_idletimer(sk);
497
498 rose_clear_queues(sk);
499
500 rose->lci = 0;
501 rose->state = ROSE_STATE_0;
502
503 if (cause != -1)
504 rose->cause = cause;
505
506 if (diagnostic != -1)
507 rose->diagnostic = diagnostic;
508
509 sk->sk_state = TCP_CLOSE;
510 sk->sk_err = reason;
511 sk->sk_shutdown |= SEND_SHUTDOWN;
512
513 if (!sock_flag(sk, SOCK_DEAD)) {
514 sk->sk_state_change(sk);
515 sock_set_flag(sk, SOCK_DEAD);
516 }
517 }
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