1 /*
2 * ROSE release 003
3 *
4 * This code REQUIRES 2.1.15 or higher/ NET3.038
5 *
6 * This module:
7 * This module is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * History
13 * ROSE 001 Jonathan(G4KLX) Cloned from nr_subr.c
14 * ROSE 002 Jonathan(G4KLX) Centralised disconnect processing.
15 * ROSE 003 Jonathan(G4KLX) Added use count to neighbours.
16 */
17
18 #include <linux/errno.h>
19 #include <linux/types.h>
20 #include <linux/socket.h>
21 #include <linux/in.h>
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <net/ax25.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/skbuff.h>
32 #include <net/sock.h>
33 #include <asm/segment.h>
34 #include <asm/system.h>
35 #include <linux/fcntl.h>
36 #include <linux/mm.h>
37 #include <linux/interrupt.h>
38 #include <net/rose.h>
39
40 /*
41 * This routine purges all of the queues of frames.
42 */
rose_clear_queues(struct sock * sk)43 void rose_clear_queues(struct sock *sk)
44 {
45 skb_queue_purge(&sk->write_queue);
46 skb_queue_purge(&sk->protinfo.rose->ack_queue);
47 }
48
49 /*
50 * This routine purges the input queue of those frames that have been
51 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
52 * SDL diagram.
53 */
rose_frames_acked(struct sock * sk,unsigned short nr)54 void rose_frames_acked(struct sock *sk, unsigned short nr)
55 {
56 struct sk_buff *skb;
57
58 /*
59 * Remove all the ack-ed frames from the ack queue.
60 */
61 if (sk->protinfo.rose->va != nr) {
62 while (skb_peek(&sk->protinfo.rose->ack_queue) != NULL && sk->protinfo.rose->va != nr) {
63 skb = skb_dequeue(&sk->protinfo.rose->ack_queue);
64 kfree_skb(skb);
65 sk->protinfo.rose->va = (sk->protinfo.rose->va + 1) % ROSE_MODULUS;
66 }
67 }
68 }
69
rose_requeue_frames(struct sock * sk)70 void rose_requeue_frames(struct sock *sk)
71 {
72 struct sk_buff *skb, *skb_prev = NULL;
73
74 /*
75 * Requeue all the un-ack-ed frames on the output queue to be picked
76 * up by rose_kick. This arrangement handles the possibility of an
77 * empty output queue.
78 */
79 while ((skb = skb_dequeue(&sk->protinfo.rose->ack_queue)) != NULL) {
80 if (skb_prev == NULL)
81 skb_queue_head(&sk->write_queue, skb);
82 else
83 skb_append(skb_prev, skb);
84 skb_prev = skb;
85 }
86 }
87
88 /*
89 * Validate that the value of nr is between va and vs. Return true or
90 * false for testing.
91 */
rose_validate_nr(struct sock * sk,unsigned short nr)92 int rose_validate_nr(struct sock *sk, unsigned short nr)
93 {
94 unsigned short vc = sk->protinfo.rose->va;
95
96 while (vc != sk->protinfo.rose->vs) {
97 if (nr == vc) return 1;
98 vc = (vc + 1) % ROSE_MODULUS;
99 }
100
101 if (nr == sk->protinfo.rose->vs) return 1;
102
103 return 0;
104 }
105
106 /*
107 * This routine is called when the packet layer internally generates a
108 * control frame.
109 */
rose_write_internal(struct sock * sk,int frametype)110 void rose_write_internal(struct sock *sk, int frametype)
111 {
112 struct sk_buff *skb;
113 unsigned char *dptr;
114 unsigned char lci1, lci2;
115 char buffer[100];
116 int len, faclen = 0;
117 int ax25_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1;
118
119 len = ax25_header_len + ROSE_MIN_LEN;
120
121 switch (frametype) {
122 case ROSE_CALL_REQUEST:
123 len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
124 faclen = rose_create_facilities(buffer, sk->protinfo.rose);
125 len += faclen;
126 break;
127 case ROSE_CALL_ACCEPTED:
128 case ROSE_RESET_REQUEST:
129 len += 2;
130 break;
131 case ROSE_CLEAR_REQUEST:
132 len += 3;
133 /* facilities */
134 faclen = 3 + 2 + AX25_ADDR_LEN + 3 + ROSE_ADDR_LEN;
135 dptr = buffer;
136 *dptr++ = faclen-1; /* Facilities length */
137 *dptr++ = 0;
138 *dptr++ = FAC_NATIONAL;
139 *dptr++ = FAC_NATIONAL_FAIL_CALL;
140 *dptr++ = AX25_ADDR_LEN;
141 memcpy(dptr, &rose_callsign, AX25_ADDR_LEN);
142 dptr += AX25_ADDR_LEN;
143 *dptr++ = FAC_NATIONAL_FAIL_ADD;
144 *dptr++ = ROSE_ADDR_LEN + 1;
145 *dptr++ = ROSE_ADDR_LEN * 2;
146 memcpy(dptr, &sk->protinfo.rose->source_addr, ROSE_ADDR_LEN);
147 len += faclen;
148 break;
149 }
150
151 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
152 return;
153
154 /*
155 * Space for AX.25 header and PID.
156 */
157 skb_reserve(skb, ax25_header_len);
158
159 dptr = skb_put(skb, len - ax25_header_len);
160
161 lci1 = (sk->protinfo.rose->lci >> 8) & 0x0F;
162 lci2 = (sk->protinfo.rose->lci >> 0) & 0xFF;
163
164 switch (frametype) {
165
166 case ROSE_CALL_REQUEST:
167 *dptr++ = ROSE_GFI | lci1;
168 *dptr++ = lci2;
169 *dptr++ = frametype;
170 *dptr++ = 0xAA;
171 memcpy(dptr, &sk->protinfo.rose->dest_addr, ROSE_ADDR_LEN);
172 dptr += ROSE_ADDR_LEN;
173 memcpy(dptr, &sk->protinfo.rose->source_addr, ROSE_ADDR_LEN);
174 dptr += ROSE_ADDR_LEN;
175 memcpy(dptr, buffer, faclen);
176 dptr += faclen;
177 break;
178
179 case ROSE_CALL_ACCEPTED:
180 *dptr++ = ROSE_GFI | lci1;
181 *dptr++ = lci2;
182 *dptr++ = frametype;
183 *dptr++ = 0x00; /* Address length */
184 *dptr++ = 0; /* Facilities length */
185 break;
186
187 case ROSE_CLEAR_REQUEST:
188 *dptr++ = ROSE_GFI | lci1;
189 *dptr++ = lci2;
190 *dptr++ = frametype;
191 *dptr++ = sk->protinfo.rose->cause;
192 *dptr++ = sk->protinfo.rose->diagnostic;
193 *dptr++ = 0x00; /* Address length */
194 memcpy(dptr, buffer, faclen);
195 dptr += faclen;
196 break;
197
198 case ROSE_RESET_REQUEST:
199 *dptr++ = ROSE_GFI | lci1;
200 *dptr++ = lci2;
201 *dptr++ = frametype;
202 *dptr++ = ROSE_DTE_ORIGINATED;
203 *dptr++ = 0;
204 break;
205
206 case ROSE_RR:
207 case ROSE_RNR:
208 *dptr++ = ROSE_GFI | lci1;
209 *dptr++ = lci2;
210 *dptr = frametype;
211 *dptr++ |= (sk->protinfo.rose->vr << 5) & 0xE0;
212 break;
213
214 case ROSE_CLEAR_CONFIRMATION:
215 case ROSE_RESET_CONFIRMATION:
216 *dptr++ = ROSE_GFI | lci1;
217 *dptr++ = lci2;
218 *dptr++ = frametype;
219 break;
220
221 default:
222 printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
223 kfree_skb(skb);
224 return;
225 }
226
227 rose_transmit_link(skb, sk->protinfo.rose->neighbour);
228 }
229
rose_decode(struct sk_buff * skb,int * ns,int * nr,int * q,int * d,int * m)230 int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
231 {
232 unsigned char *frame;
233
234 frame = skb->data;
235
236 *ns = *nr = *q = *d = *m = 0;
237
238 switch (frame[2]) {
239 case ROSE_CALL_REQUEST:
240 case ROSE_CALL_ACCEPTED:
241 case ROSE_CLEAR_REQUEST:
242 case ROSE_CLEAR_CONFIRMATION:
243 case ROSE_RESET_REQUEST:
244 case ROSE_RESET_CONFIRMATION:
245 return frame[2];
246 default:
247 break;
248 }
249
250 if ((frame[2] & 0x1F) == ROSE_RR ||
251 (frame[2] & 0x1F) == ROSE_RNR) {
252 *nr = (frame[2] >> 5) & 0x07;
253 return frame[2] & 0x1F;
254 }
255
256 if ((frame[2] & 0x01) == ROSE_DATA) {
257 *q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
258 *d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
259 *m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
260 *nr = (frame[2] >> 5) & 0x07;
261 *ns = (frame[2] >> 1) & 0x07;
262 return ROSE_DATA;
263 }
264
265 return ROSE_ILLEGAL;
266 }
267
rose_parse_national(unsigned char * p,struct rose_facilities_struct * facilities,int len)268 static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
269 {
270 unsigned char *pt;
271 unsigned char l, lg, n = 0;
272 int fac_national_digis_received = 0;
273
274 do {
275 switch (*p & 0xC0) {
276 case 0x00:
277 p += 2;
278 n += 2;
279 len -= 2;
280 break;
281
282 case 0x40:
283 if (*p == FAC_NATIONAL_RAND)
284 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
285 p += 3;
286 n += 3;
287 len -= 3;
288 break;
289
290 case 0x80:
291 p += 4;
292 n += 4;
293 len -= 4;
294 break;
295
296 case 0xC0:
297 l = p[1];
298 if (*p == FAC_NATIONAL_DEST_DIGI) {
299 if (!fac_national_digis_received) {
300 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
301 facilities->source_ndigis = 1;
302 }
303 }
304 else if (*p == FAC_NATIONAL_SRC_DIGI) {
305 if (!fac_national_digis_received) {
306 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
307 facilities->dest_ndigis = 1;
308 }
309 }
310 else if (*p == FAC_NATIONAL_FAIL_CALL) {
311 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
312 }
313 else if (*p == FAC_NATIONAL_FAIL_ADD) {
314 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
315 }
316 else if (*p == FAC_NATIONAL_DIGIS) {
317 fac_national_digis_received = 1;
318 facilities->source_ndigis = 0;
319 facilities->dest_ndigis = 0;
320 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
321 if (pt[6] & AX25_HBIT)
322 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
323 else
324 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
325 }
326 }
327 p += l + 2;
328 n += l + 2;
329 len -= l + 2;
330 break;
331 }
332 } while (*p != 0x00 && len > 0);
333
334 return n;
335 }
336
rose_parse_ccitt(unsigned char * p,struct rose_facilities_struct * facilities,int len)337 static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
338 {
339 unsigned char l, n = 0;
340 char callsign[11];
341
342 do {
343 switch (*p & 0xC0) {
344 case 0x00:
345 p += 2;
346 n += 2;
347 len -= 2;
348 break;
349
350 case 0x40:
351 p += 3;
352 n += 3;
353 len -= 3;
354 break;
355
356 case 0x80:
357 p += 4;
358 n += 4;
359 len -= 4;
360 break;
361
362 case 0xC0:
363 l = p[1];
364 if (*p == FAC_CCITT_DEST_NSAP) {
365 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
366 memcpy(callsign, p + 12, l - 10);
367 callsign[l - 10] = '\0';
368 facilities->source_call = *asc2ax(callsign);
369 }
370 if (*p == FAC_CCITT_SRC_NSAP) {
371 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
372 memcpy(callsign, p + 12, l - 10);
373 callsign[l - 10] = '\0';
374 facilities->dest_call = *asc2ax(callsign);
375 }
376 p += l + 2;
377 n += l + 2;
378 len -= l + 2;
379 break;
380 }
381 } while (*p != 0x00 && len > 0);
382
383 return n;
384 }
385
rose_parse_facilities(unsigned char * p,struct rose_facilities_struct * facilities)386 int rose_parse_facilities(unsigned char *p, struct rose_facilities_struct *facilities)
387 {
388 int facilities_len, len;
389
390 facilities_len = *p++;
391
392 if (facilities_len == 0)
393 return 0;
394
395 while (facilities_len > 0) {
396 if (*p == 0x00) {
397 facilities_len--;
398 p++;
399
400 switch (*p) {
401 case FAC_NATIONAL: /* National */
402 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
403 facilities_len -= len + 1;
404 p += len + 1;
405 break;
406
407 case FAC_CCITT: /* CCITT */
408 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
409 facilities_len -= len + 1;
410 p += len + 1;
411 break;
412
413 default:
414 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
415 facilities_len--;
416 p++;
417 break;
418 }
419 }
420 else break; /* Error in facilities format */
421 }
422
423 return 1;
424 }
425
rose_create_facilities(unsigned char * buffer,rose_cb * rose)426 int rose_create_facilities(unsigned char *buffer, rose_cb *rose)
427 {
428 unsigned char *p = buffer + 1;
429 char *callsign;
430 int len, nb;
431
432 /* National Facilities */
433 if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
434 *p++ = 0x00;
435 *p++ = FAC_NATIONAL;
436
437 if (rose->rand != 0) {
438 *p++ = FAC_NATIONAL_RAND;
439 *p++ = (rose->rand >> 8) & 0xFF;
440 *p++ = (rose->rand >> 0) & 0xFF;
441 }
442
443 /* Sent before older facilities */
444 if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
445 int maxdigi = 0;
446 *p++ = FAC_NATIONAL_DIGIS;
447 *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
448 for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
449 if (++maxdigi >= ROSE_MAX_DIGIS)
450 break;
451 memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
452 p[6] |= AX25_HBIT;
453 p += AX25_ADDR_LEN;
454 }
455 for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
456 if (++maxdigi >= ROSE_MAX_DIGIS)
457 break;
458 memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
459 p[6] &= ~AX25_HBIT;
460 p += AX25_ADDR_LEN;
461 }
462 }
463
464 /* For compatibility */
465 if (rose->source_ndigis > 0) {
466 *p++ = FAC_NATIONAL_SRC_DIGI;
467 *p++ = AX25_ADDR_LEN;
468 memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
469 p += AX25_ADDR_LEN;
470 }
471
472 /* For compatibility */
473 if (rose->dest_ndigis > 0) {
474 *p++ = FAC_NATIONAL_DEST_DIGI;
475 *p++ = AX25_ADDR_LEN;
476 memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
477 p += AX25_ADDR_LEN;
478 }
479 }
480
481 *p++ = 0x00;
482 *p++ = FAC_CCITT;
483
484 *p++ = FAC_CCITT_DEST_NSAP;
485
486 callsign = ax2asc(&rose->dest_call);
487
488 *p++ = strlen(callsign) + 10;
489 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
490
491 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
492 *p++ = ROSE_ADDR_LEN * 2;
493 memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
494 p += ROSE_ADDR_LEN;
495
496 memcpy(p, callsign, strlen(callsign));
497 p += strlen(callsign);
498
499 *p++ = FAC_CCITT_SRC_NSAP;
500
501 callsign = ax2asc(&rose->source_call);
502
503 *p++ = strlen(callsign) + 10;
504 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
505
506 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
507 *p++ = ROSE_ADDR_LEN * 2;
508 memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
509 p += ROSE_ADDR_LEN;
510
511 memcpy(p, callsign, strlen(callsign));
512 p += strlen(callsign);
513
514 len = p - buffer;
515 buffer[0] = len - 1;
516
517 return len;
518 }
519
rose_disconnect(struct sock * sk,int reason,int cause,int diagnostic)520 void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
521 {
522 rose_stop_timer(sk);
523 rose_stop_idletimer(sk);
524
525 rose_clear_queues(sk);
526
527 sk->protinfo.rose->lci = 0;
528 sk->protinfo.rose->state = ROSE_STATE_0;
529
530 if (cause != -1)
531 sk->protinfo.rose->cause = cause;
532
533 if (diagnostic != -1)
534 sk->protinfo.rose->diagnostic = diagnostic;
535
536 sk->state = TCP_CLOSE;
537 sk->err = reason;
538 sk->shutdown |= SEND_SHUTDOWN;
539
540 if (!sk->dead)
541 sk->state_change(sk);
542
543 sk->dead = 1;
544 }
545