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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/timer.h>
15#include <linux/string.h>
16#include <linux/sockios.h>
17#include <linux/net.h>
18#include <linux/slab.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_states.h>
25#include <linux/fcntl.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
28#include <net/rose.h>
29
30static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);
31
32/*
33 * This routine purges all of the queues of frames.
34 */
35void rose_clear_queues(struct sock *sk)
36{
37 skb_queue_purge(&sk->sk_write_queue);
38 skb_queue_purge(&rose_sk(sk)->ack_queue);
39}
40
41/*
42 * This routine purges the input queue of those frames that have been
43 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
44 * SDL diagram.
45 */
46void rose_frames_acked(struct sock *sk, unsigned short nr)
47{
48 struct sk_buff *skb;
49 struct rose_sock *rose = rose_sk(sk);
50
51 /*
52 * Remove all the ack-ed frames from the ack queue.
53 */
54 if (rose->va != nr) {
55 while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
56 skb = skb_dequeue(&rose->ack_queue);
57 kfree_skb(skb);
58 rose->va = (rose->va + 1) % ROSE_MODULUS;
59 }
60 }
61}
62
63void rose_requeue_frames(struct sock *sk)
64{
65 struct sk_buff *skb, *skb_prev = NULL;
66
67 /*
68 * Requeue all the un-ack-ed frames on the output queue to be picked
69 * up by rose_kick. This arrangement handles the possibility of an
70 * empty output queue.
71 */
72 while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
73 if (skb_prev == NULL)
74 skb_queue_head(&sk->sk_write_queue, skb);
75 else
76 skb_append(skb_prev, skb, &sk->sk_write_queue);
77 skb_prev = skb;
78 }
79}
80
81/*
82 * Validate that the value of nr is between va and vs. Return true or
83 * false for testing.
84 */
85int rose_validate_nr(struct sock *sk, unsigned short nr)
86{
87 struct rose_sock *rose = rose_sk(sk);
88 unsigned short vc = rose->va;
89
90 while (vc != rose->vs) {
91 if (nr == vc) return 1;
92 vc = (vc + 1) % ROSE_MODULUS;
93 }
94
95 return nr == rose->vs;
96}
97
98/*
99 * This routine is called when the packet layer internally generates a
100 * control frame.
101 */
102void rose_write_internal(struct sock *sk, int frametype)
103{
104 struct rose_sock *rose = rose_sk(sk);
105 struct sk_buff *skb;
106 unsigned char *dptr;
107 unsigned char lci1, lci2;
108 char buffer[100];
109 int len, faclen = 0;
110
111 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
112
113 switch (frametype) {
114 case ROSE_CALL_REQUEST:
115 len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
116 faclen = rose_create_facilities(buffer, rose);
117 len += faclen;
118 break;
119 case ROSE_CALL_ACCEPTED:
120 case ROSE_CLEAR_REQUEST:
121 case ROSE_RESET_REQUEST:
122 len += 2;
123 break;
124 }
125
126 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
127 return;
128
129 /*
130 * Space for AX.25 header and PID.
131 */
132 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);
133
134 dptr = skb_put(skb, skb_tailroom(skb));
135
136 lci1 = (rose->lci >> 8) & 0x0F;
137 lci2 = (rose->lci >> 0) & 0xFF;
138
139 switch (frametype) {
140 case ROSE_CALL_REQUEST:
141 *dptr++ = ROSE_GFI | lci1;
142 *dptr++ = lci2;
143 *dptr++ = frametype;
144 *dptr++ = ROSE_CALL_REQ_ADDR_LEN_VAL;
145 memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN);
146 dptr += ROSE_ADDR_LEN;
147 memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
148 dptr += ROSE_ADDR_LEN;
149 memcpy(dptr, buffer, faclen);
150 dptr += faclen;
151 break;
152
153 case ROSE_CALL_ACCEPTED:
154 *dptr++ = ROSE_GFI | lci1;
155 *dptr++ = lci2;
156 *dptr++ = frametype;
157 *dptr++ = 0x00; /* Address length */
158 *dptr++ = 0; /* Facilities length */
159 break;
160
161 case ROSE_CLEAR_REQUEST:
162 *dptr++ = ROSE_GFI | lci1;
163 *dptr++ = lci2;
164 *dptr++ = frametype;
165 *dptr++ = rose->cause;
166 *dptr++ = rose->diagnostic;
167 break;
168
169 case ROSE_RESET_REQUEST:
170 *dptr++ = ROSE_GFI | lci1;
171 *dptr++ = lci2;
172 *dptr++ = frametype;
173 *dptr++ = ROSE_DTE_ORIGINATED;
174 *dptr++ = 0;
175 break;
176
177 case ROSE_RR:
178 case ROSE_RNR:
179 *dptr++ = ROSE_GFI | lci1;
180 *dptr++ = lci2;
181 *dptr = frametype;
182 *dptr++ |= (rose->vr << 5) & 0xE0;
183 break;
184
185 case ROSE_CLEAR_CONFIRMATION:
186 case ROSE_RESET_CONFIRMATION:
187 *dptr++ = ROSE_GFI | lci1;
188 *dptr++ = lci2;
189 *dptr++ = frametype;
190 break;
191
192 default:
193 printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
194 kfree_skb(skb);
195 return;
196 }
197
198 rose_transmit_link(skb, rose->neighbour);
199}
200
201int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
202{
203 unsigned char *frame;
204
205 frame = skb->data;
206
207 *ns = *nr = *q = *d = *m = 0;
208
209 switch (frame[2]) {
210 case ROSE_CALL_REQUEST:
211 case ROSE_CALL_ACCEPTED:
212 case ROSE_CLEAR_REQUEST:
213 case ROSE_CLEAR_CONFIRMATION:
214 case ROSE_RESET_REQUEST:
215 case ROSE_RESET_CONFIRMATION:
216 return frame[2];
217 default:
218 break;
219 }
220
221 if ((frame[2] & 0x1F) == ROSE_RR ||
222 (frame[2] & 0x1F) == ROSE_RNR) {
223 *nr = (frame[2] >> 5) & 0x07;
224 return frame[2] & 0x1F;
225 }
226
227 if ((frame[2] & 0x01) == ROSE_DATA) {
228 *q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
229 *d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
230 *m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
231 *nr = (frame[2] >> 5) & 0x07;
232 *ns = (frame[2] >> 1) & 0x07;
233 return ROSE_DATA;
234 }
235
236 return ROSE_ILLEGAL;
237}
238
239static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
240{
241 unsigned char *pt;
242 unsigned char l, lg, n = 0;
243 int fac_national_digis_received = 0;
244
245 do {
246 switch (*p & 0xC0) {
247 case 0x00:
248 if (len < 2)
249 return -1;
250 p += 2;
251 n += 2;
252 len -= 2;
253 break;
254
255 case 0x40:
256 if (len < 3)
257 return -1;
258 if (*p == FAC_NATIONAL_RAND)
259 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
260 p += 3;
261 n += 3;
262 len -= 3;
263 break;
264
265 case 0x80:
266 if (len < 4)
267 return -1;
268 p += 4;
269 n += 4;
270 len -= 4;
271 break;
272
273 case 0xC0:
274 if (len < 2)
275 return -1;
276 l = p[1];
277 if (len < 2 + l)
278 return -1;
279 if (*p == FAC_NATIONAL_DEST_DIGI) {
280 if (!fac_national_digis_received) {
281 if (l < AX25_ADDR_LEN)
282 return -1;
283 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
284 facilities->source_ndigis = 1;
285 }
286 }
287 else if (*p == FAC_NATIONAL_SRC_DIGI) {
288 if (!fac_national_digis_received) {
289 if (l < AX25_ADDR_LEN)
290 return -1;
291 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
292 facilities->dest_ndigis = 1;
293 }
294 }
295 else if (*p == FAC_NATIONAL_FAIL_CALL) {
296 if (l < AX25_ADDR_LEN)
297 return -1;
298 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
299 }
300 else if (*p == FAC_NATIONAL_FAIL_ADD) {
301 if (l < 1 + ROSE_ADDR_LEN)
302 return -1;
303 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
304 }
305 else if (*p == FAC_NATIONAL_DIGIS) {
306 if (l % AX25_ADDR_LEN)
307 return -1;
308 fac_national_digis_received = 1;
309 facilities->source_ndigis = 0;
310 facilities->dest_ndigis = 0;
311 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
312 if (pt[6] & AX25_HBIT) {
313 if (facilities->dest_ndigis >= ROSE_MAX_DIGIS)
314 return -1;
315 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
316 } else {
317 if (facilities->source_ndigis >= ROSE_MAX_DIGIS)
318 return -1;
319 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
320 }
321 }
322 }
323 p += l + 2;
324 n += l + 2;
325 len -= l + 2;
326 break;
327 }
328 } while (*p != 0x00 && len > 0);
329
330 return n;
331}
332
333static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
334{
335 unsigned char l, n = 0;
336 char callsign[11];
337
338 do {
339 switch (*p & 0xC0) {
340 case 0x00:
341 if (len < 2)
342 return -1;
343 p += 2;
344 n += 2;
345 len -= 2;
346 break;
347
348 case 0x40:
349 if (len < 3)
350 return -1;
351 p += 3;
352 n += 3;
353 len -= 3;
354 break;
355
356 case 0x80:
357 if (len < 4)
358 return -1;
359 p += 4;
360 n += 4;
361 len -= 4;
362 break;
363
364 case 0xC0:
365 if (len < 2)
366 return -1;
367 l = p[1];
368
369 /* Prevent overflows*/
370 if (l < 10 || l > 20)
371 return -1;
372
373 if (*p == FAC_CCITT_DEST_NSAP) {
374 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
375 memcpy(callsign, p + 12, l - 10);
376 callsign[l - 10] = '\0';
377 asc2ax(&facilities->source_call, callsign);
378 }
379 if (*p == FAC_CCITT_SRC_NSAP) {
380 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
381 memcpy(callsign, p + 12, l - 10);
382 callsign[l - 10] = '\0';
383 asc2ax(&facilities->dest_call, callsign);
384 }
385 p += l + 2;
386 n += l + 2;
387 len -= l + 2;
388 break;
389 }
390 } while (*p != 0x00 && len > 0);
391
392 return n;
393}
394
395int rose_parse_facilities(unsigned char *p, unsigned packet_len,
396 struct rose_facilities_struct *facilities)
397{
398 int facilities_len, len;
399
400 facilities_len = *p++;
401
402 if (facilities_len == 0 || (unsigned int)facilities_len > packet_len)
403 return 0;
404
405 while (facilities_len >= 3 && *p == 0x00) {
406 facilities_len--;
407 p++;
408
409 switch (*p) {
410 case FAC_NATIONAL: /* National */
411 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
412 break;
413
414 case FAC_CCITT: /* CCITT */
415 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
416 break;
417
418 default:
419 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
420 len = 1;
421 break;
422 }
423
424 if (len < 0)
425 return 0;
426 if (WARN_ON(len >= facilities_len))
427 return 0;
428 facilities_len -= len + 1;
429 p += len + 1;
430 }
431
432 return facilities_len == 0;
433}
434
435static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
436{
437 unsigned char *p = buffer + 1;
438 char *callsign;
439 char buf[11];
440 int len, nb;
441
442 /* National Facilities */
443 if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
444 *p++ = 0x00;
445 *p++ = FAC_NATIONAL;
446
447 if (rose->rand != 0) {
448 *p++ = FAC_NATIONAL_RAND;
449 *p++ = (rose->rand >> 8) & 0xFF;
450 *p++ = (rose->rand >> 0) & 0xFF;
451 }
452
453 /* Sent before older facilities */
454 if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
455 int maxdigi = 0;
456 *p++ = FAC_NATIONAL_DIGIS;
457 *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
458 for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
459 if (++maxdigi >= ROSE_MAX_DIGIS)
460 break;
461 memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
462 p[6] |= AX25_HBIT;
463 p += AX25_ADDR_LEN;
464 }
465 for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
466 if (++maxdigi >= ROSE_MAX_DIGIS)
467 break;
468 memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
469 p[6] &= ~AX25_HBIT;
470 p += AX25_ADDR_LEN;
471 }
472 }
473
474 /* For compatibility */
475 if (rose->source_ndigis > 0) {
476 *p++ = FAC_NATIONAL_SRC_DIGI;
477 *p++ = AX25_ADDR_LEN;
478 memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
479 p += AX25_ADDR_LEN;
480 }
481
482 /* For compatibility */
483 if (rose->dest_ndigis > 0) {
484 *p++ = FAC_NATIONAL_DEST_DIGI;
485 *p++ = AX25_ADDR_LEN;
486 memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
487 p += AX25_ADDR_LEN;
488 }
489 }
490
491 *p++ = 0x00;
492 *p++ = FAC_CCITT;
493
494 *p++ = FAC_CCITT_DEST_NSAP;
495
496 callsign = ax2asc(buf, &rose->dest_call);
497
498 *p++ = strlen(callsign) + 10;
499 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
500
501 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
502 *p++ = ROSE_ADDR_LEN * 2;
503 memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
504 p += ROSE_ADDR_LEN;
505
506 memcpy(p, callsign, strlen(callsign));
507 p += strlen(callsign);
508
509 *p++ = FAC_CCITT_SRC_NSAP;
510
511 callsign = ax2asc(buf, &rose->source_call);
512
513 *p++ = strlen(callsign) + 10;
514 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
515
516 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
517 *p++ = ROSE_ADDR_LEN * 2;
518 memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
519 p += ROSE_ADDR_LEN;
520
521 memcpy(p, callsign, strlen(callsign));
522 p += strlen(callsign);
523
524 len = p - buffer;
525 buffer[0] = len - 1;
526
527 return len;
528}
529
530void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
531{
532 struct rose_sock *rose = rose_sk(sk);
533
534 rose_stop_timer(sk);
535 rose_stop_idletimer(sk);
536
537 rose_clear_queues(sk);
538
539 rose->lci = 0;
540 rose->state = ROSE_STATE_0;
541
542 if (cause != -1)
543 rose->cause = cause;
544
545 if (diagnostic != -1)
546 rose->diagnostic = diagnostic;
547
548 sk->sk_state = TCP_CLOSE;
549 sk->sk_err = reason;
550 sk->sk_shutdown |= SEND_SHUTDOWN;
551
552 if (!sock_flag(sk, SOCK_DEAD)) {
553 sk->sk_state_change(sk);
554 sock_set_flag(sk, SOCK_DEAD);
555 }
556}
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/timer.h>
15#include <linux/string.h>
16#include <linux/sockios.h>
17#include <linux/net.h>
18#include <linux/slab.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_states.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
31static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);
32
33/*
34 * This routine purges all of the queues of frames.
35 */
36void rose_clear_queues(struct sock *sk)
37{
38 skb_queue_purge(&sk->sk_write_queue);
39 skb_queue_purge(&rose_sk(sk)->ack_queue);
40}
41
42/*
43 * This routine purges the input queue of those frames that have been
44 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
45 * SDL diagram.
46 */
47void rose_frames_acked(struct sock *sk, unsigned short nr)
48{
49 struct sk_buff *skb;
50 struct rose_sock *rose = rose_sk(sk);
51
52 /*
53 * Remove all the ack-ed frames from the ack queue.
54 */
55 if (rose->va != nr) {
56 while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
57 skb = skb_dequeue(&rose->ack_queue);
58 kfree_skb(skb);
59 rose->va = (rose->va + 1) % ROSE_MODULUS;
60 }
61 }
62}
63
64void rose_requeue_frames(struct sock *sk)
65{
66 struct sk_buff *skb, *skb_prev = NULL;
67
68 /*
69 * Requeue all the un-ack-ed frames on the output queue to be picked
70 * up by rose_kick. This arrangement handles the possibility of an
71 * empty output queue.
72 */
73 while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
74 if (skb_prev == NULL)
75 skb_queue_head(&sk->sk_write_queue, skb);
76 else
77 skb_append(skb_prev, skb, &sk->sk_write_queue);
78 skb_prev = skb;
79 }
80}
81
82/*
83 * Validate that the value of nr is between va and vs. Return true or
84 * false for testing.
85 */
86int rose_validate_nr(struct sock *sk, unsigned short nr)
87{
88 struct rose_sock *rose = rose_sk(sk);
89 unsigned short vc = rose->va;
90
91 while (vc != rose->vs) {
92 if (nr == vc) return 1;
93 vc = (vc + 1) % ROSE_MODULUS;
94 }
95
96 return nr == rose->vs;
97}
98
99/*
100 * This routine is called when the packet layer internally generates a
101 * control frame.
102 */
103void rose_write_internal(struct sock *sk, int frametype)
104{
105 struct rose_sock *rose = rose_sk(sk);
106 struct sk_buff *skb;
107 unsigned char *dptr;
108 unsigned char lci1, lci2;
109 char buffer[100];
110 int len, faclen = 0;
111
112 len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
113
114 switch (frametype) {
115 case ROSE_CALL_REQUEST:
116 len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
117 faclen = rose_create_facilities(buffer, rose);
118 len += faclen;
119 break;
120 case ROSE_CALL_ACCEPTED:
121 case ROSE_CLEAR_REQUEST:
122 case ROSE_RESET_REQUEST:
123 len += 2;
124 break;
125 }
126
127 if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
128 return;
129
130 /*
131 * Space for AX.25 header and PID.
132 */
133 skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);
134
135 dptr = skb_put(skb, skb_tailroom(skb));
136
137 lci1 = (rose->lci >> 8) & 0x0F;
138 lci2 = (rose->lci >> 0) & 0xFF;
139
140 switch (frametype) {
141 case ROSE_CALL_REQUEST:
142 *dptr++ = ROSE_GFI | lci1;
143 *dptr++ = lci2;
144 *dptr++ = frametype;
145 *dptr++ = ROSE_CALL_REQ_ADDR_LEN_VAL;
146 memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN);
147 dptr += ROSE_ADDR_LEN;
148 memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
149 dptr += ROSE_ADDR_LEN;
150 memcpy(dptr, buffer, faclen);
151 dptr += faclen;
152 break;
153
154 case ROSE_CALL_ACCEPTED:
155 *dptr++ = ROSE_GFI | lci1;
156 *dptr++ = lci2;
157 *dptr++ = frametype;
158 *dptr++ = 0x00; /* Address length */
159 *dptr++ = 0; /* Facilities length */
160 break;
161
162 case ROSE_CLEAR_REQUEST:
163 *dptr++ = ROSE_GFI | lci1;
164 *dptr++ = lci2;
165 *dptr++ = frametype;
166 *dptr++ = rose->cause;
167 *dptr++ = rose->diagnostic;
168 break;
169
170 case ROSE_RESET_REQUEST:
171 *dptr++ = ROSE_GFI | lci1;
172 *dptr++ = lci2;
173 *dptr++ = frametype;
174 *dptr++ = ROSE_DTE_ORIGINATED;
175 *dptr++ = 0;
176 break;
177
178 case ROSE_RR:
179 case ROSE_RNR:
180 *dptr++ = ROSE_GFI | lci1;
181 *dptr++ = lci2;
182 *dptr = frametype;
183 *dptr++ |= (rose->vr << 5) & 0xE0;
184 break;
185
186 case ROSE_CLEAR_CONFIRMATION:
187 case ROSE_RESET_CONFIRMATION:
188 *dptr++ = ROSE_GFI | lci1;
189 *dptr++ = lci2;
190 *dptr++ = frametype;
191 break;
192
193 default:
194 printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
195 kfree_skb(skb);
196 return;
197 }
198
199 rose_transmit_link(skb, rose->neighbour);
200}
201
202int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
203{
204 unsigned char *frame;
205
206 frame = skb->data;
207
208 *ns = *nr = *q = *d = *m = 0;
209
210 switch (frame[2]) {
211 case ROSE_CALL_REQUEST:
212 case ROSE_CALL_ACCEPTED:
213 case ROSE_CLEAR_REQUEST:
214 case ROSE_CLEAR_CONFIRMATION:
215 case ROSE_RESET_REQUEST:
216 case ROSE_RESET_CONFIRMATION:
217 return frame[2];
218 default:
219 break;
220 }
221
222 if ((frame[2] & 0x1F) == ROSE_RR ||
223 (frame[2] & 0x1F) == ROSE_RNR) {
224 *nr = (frame[2] >> 5) & 0x07;
225 return frame[2] & 0x1F;
226 }
227
228 if ((frame[2] & 0x01) == ROSE_DATA) {
229 *q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
230 *d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
231 *m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
232 *nr = (frame[2] >> 5) & 0x07;
233 *ns = (frame[2] >> 1) & 0x07;
234 return ROSE_DATA;
235 }
236
237 return ROSE_ILLEGAL;
238}
239
240static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
241{
242 unsigned char *pt;
243 unsigned char l, lg, n = 0;
244 int fac_national_digis_received = 0;
245
246 do {
247 switch (*p & 0xC0) {
248 case 0x00:
249 if (len < 2)
250 return -1;
251 p += 2;
252 n += 2;
253 len -= 2;
254 break;
255
256 case 0x40:
257 if (len < 3)
258 return -1;
259 if (*p == FAC_NATIONAL_RAND)
260 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
261 p += 3;
262 n += 3;
263 len -= 3;
264 break;
265
266 case 0x80:
267 if (len < 4)
268 return -1;
269 p += 4;
270 n += 4;
271 len -= 4;
272 break;
273
274 case 0xC0:
275 if (len < 2)
276 return -1;
277 l = p[1];
278 if (len < 2 + l)
279 return -1;
280 if (*p == FAC_NATIONAL_DEST_DIGI) {
281 if (!fac_national_digis_received) {
282 if (l < AX25_ADDR_LEN)
283 return -1;
284 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
285 facilities->source_ndigis = 1;
286 }
287 }
288 else if (*p == FAC_NATIONAL_SRC_DIGI) {
289 if (!fac_national_digis_received) {
290 if (l < AX25_ADDR_LEN)
291 return -1;
292 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
293 facilities->dest_ndigis = 1;
294 }
295 }
296 else if (*p == FAC_NATIONAL_FAIL_CALL) {
297 if (l < AX25_ADDR_LEN)
298 return -1;
299 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
300 }
301 else if (*p == FAC_NATIONAL_FAIL_ADD) {
302 if (l < 1 + ROSE_ADDR_LEN)
303 return -1;
304 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
305 }
306 else if (*p == FAC_NATIONAL_DIGIS) {
307 if (l % AX25_ADDR_LEN)
308 return -1;
309 fac_national_digis_received = 1;
310 facilities->source_ndigis = 0;
311 facilities->dest_ndigis = 0;
312 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
313 if (pt[6] & AX25_HBIT) {
314 if (facilities->dest_ndigis >= ROSE_MAX_DIGIS)
315 return -1;
316 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
317 } else {
318 if (facilities->source_ndigis >= ROSE_MAX_DIGIS)
319 return -1;
320 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
321 }
322 }
323 }
324 p += l + 2;
325 n += l + 2;
326 len -= l + 2;
327 break;
328 }
329 } while (*p != 0x00 && len > 0);
330
331 return n;
332}
333
334static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
335{
336 unsigned char l, n = 0;
337 char callsign[11];
338
339 do {
340 switch (*p & 0xC0) {
341 case 0x00:
342 if (len < 2)
343 return -1;
344 p += 2;
345 n += 2;
346 len -= 2;
347 break;
348
349 case 0x40:
350 if (len < 3)
351 return -1;
352 p += 3;
353 n += 3;
354 len -= 3;
355 break;
356
357 case 0x80:
358 if (len < 4)
359 return -1;
360 p += 4;
361 n += 4;
362 len -= 4;
363 break;
364
365 case 0xC0:
366 if (len < 2)
367 return -1;
368 l = p[1];
369
370 /* Prevent overflows*/
371 if (l < 10 || l > 20)
372 return -1;
373
374 if (*p == FAC_CCITT_DEST_NSAP) {
375 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
376 memcpy(callsign, p + 12, l - 10);
377 callsign[l - 10] = '\0';
378 asc2ax(&facilities->source_call, callsign);
379 }
380 if (*p == FAC_CCITT_SRC_NSAP) {
381 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
382 memcpy(callsign, p + 12, l - 10);
383 callsign[l - 10] = '\0';
384 asc2ax(&facilities->dest_call, callsign);
385 }
386 p += l + 2;
387 n += l + 2;
388 len -= l + 2;
389 break;
390 }
391 } while (*p != 0x00 && len > 0);
392
393 return n;
394}
395
396int rose_parse_facilities(unsigned char *p, unsigned packet_len,
397 struct rose_facilities_struct *facilities)
398{
399 int facilities_len, len;
400
401 facilities_len = *p++;
402
403 if (facilities_len == 0 || (unsigned)facilities_len > packet_len)
404 return 0;
405
406 while (facilities_len >= 3 && *p == 0x00) {
407 facilities_len--;
408 p++;
409
410 switch (*p) {
411 case FAC_NATIONAL: /* National */
412 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
413 break;
414
415 case FAC_CCITT: /* CCITT */
416 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
417 break;
418
419 default:
420 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
421 len = 1;
422 break;
423 }
424
425 if (len < 0)
426 return 0;
427 if (WARN_ON(len >= facilities_len))
428 return 0;
429 facilities_len -= len + 1;
430 p += len + 1;
431 }
432
433 return facilities_len == 0;
434}
435
436static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
437{
438 unsigned char *p = buffer + 1;
439 char *callsign;
440 char buf[11];
441 int len, nb;
442
443 /* National Facilities */
444 if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
445 *p++ = 0x00;
446 *p++ = FAC_NATIONAL;
447
448 if (rose->rand != 0) {
449 *p++ = FAC_NATIONAL_RAND;
450 *p++ = (rose->rand >> 8) & 0xFF;
451 *p++ = (rose->rand >> 0) & 0xFF;
452 }
453
454 /* Sent before older facilities */
455 if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
456 int maxdigi = 0;
457 *p++ = FAC_NATIONAL_DIGIS;
458 *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
459 for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
460 if (++maxdigi >= ROSE_MAX_DIGIS)
461 break;
462 memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
463 p[6] |= AX25_HBIT;
464 p += AX25_ADDR_LEN;
465 }
466 for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
467 if (++maxdigi >= ROSE_MAX_DIGIS)
468 break;
469 memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
470 p[6] &= ~AX25_HBIT;
471 p += AX25_ADDR_LEN;
472 }
473 }
474
475 /* For compatibility */
476 if (rose->source_ndigis > 0) {
477 *p++ = FAC_NATIONAL_SRC_DIGI;
478 *p++ = AX25_ADDR_LEN;
479 memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
480 p += AX25_ADDR_LEN;
481 }
482
483 /* For compatibility */
484 if (rose->dest_ndigis > 0) {
485 *p++ = FAC_NATIONAL_DEST_DIGI;
486 *p++ = AX25_ADDR_LEN;
487 memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
488 p += AX25_ADDR_LEN;
489 }
490 }
491
492 *p++ = 0x00;
493 *p++ = FAC_CCITT;
494
495 *p++ = FAC_CCITT_DEST_NSAP;
496
497 callsign = ax2asc(buf, &rose->dest_call);
498
499 *p++ = strlen(callsign) + 10;
500 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
501
502 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
503 *p++ = ROSE_ADDR_LEN * 2;
504 memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
505 p += ROSE_ADDR_LEN;
506
507 memcpy(p, callsign, strlen(callsign));
508 p += strlen(callsign);
509
510 *p++ = FAC_CCITT_SRC_NSAP;
511
512 callsign = ax2asc(buf, &rose->source_call);
513
514 *p++ = strlen(callsign) + 10;
515 *p++ = (strlen(callsign) + 9) * 2; /* ??? */
516
517 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
518 *p++ = ROSE_ADDR_LEN * 2;
519 memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
520 p += ROSE_ADDR_LEN;
521
522 memcpy(p, callsign, strlen(callsign));
523 p += strlen(callsign);
524
525 len = p - buffer;
526 buffer[0] = len - 1;
527
528 return len;
529}
530
531void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
532{
533 struct rose_sock *rose = rose_sk(sk);
534
535 rose_stop_timer(sk);
536 rose_stop_idletimer(sk);
537
538 rose_clear_queues(sk);
539
540 rose->lci = 0;
541 rose->state = ROSE_STATE_0;
542
543 if (cause != -1)
544 rose->cause = cause;
545
546 if (diagnostic != -1)
547 rose->diagnostic = diagnostic;
548
549 sk->sk_state = TCP_CLOSE;
550 sk->sk_err = reason;
551 sk->sk_shutdown |= SEND_SHUTDOWN;
552
553 if (!sock_flag(sk, SOCK_DEAD)) {
554 sk->sk_state_change(sk);
555 sock_set_flag(sk, SOCK_DEAD);
556 }
557}