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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 <net/ax25.h>
19#include <linux/inet.h>
20#include <linux/netdevice.h>
21#include <linux/skbuff.h>
22#include <net/sock.h>
23#include <net/tcp_states.h>
24#include <asm/system.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
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
43
44
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
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
69
70
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
83
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
100
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
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++ = 0xAA;
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;
158 *dptr++ = 0;
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 p += 2;
249 n += 2;
250 len -= 2;
251 break;
252
253 case 0x40:
254 if (*p == FAC_NATIONAL_RAND)
255 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
256 p += 3;
257 n += 3;
258 len -= 3;
259 break;
260
261 case 0x80:
262 p += 4;
263 n += 4;
264 len -= 4;
265 break;
266
267 case 0xC0:
268 l = p[1];
269 if (*p == FAC_NATIONAL_DEST_DIGI) {
270 if (!fac_national_digis_received) {
271 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
272 facilities->source_ndigis = 1;
273 }
274 }
275 else if (*p == FAC_NATIONAL_SRC_DIGI) {
276 if (!fac_national_digis_received) {
277 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
278 facilities->dest_ndigis = 1;
279 }
280 }
281 else if (*p == FAC_NATIONAL_FAIL_CALL) {
282 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
283 }
284 else if (*p == FAC_NATIONAL_FAIL_ADD) {
285 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
286 }
287 else if (*p == FAC_NATIONAL_DIGIS) {
288 fac_national_digis_received = 1;
289 facilities->source_ndigis = 0;
290 facilities->dest_ndigis = 0;
291 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
292 if (pt[6] & AX25_HBIT)
293 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
294 else
295 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
296 }
297 }
298 p += l + 2;
299 n += l + 2;
300 len -= l + 2;
301 break;
302 }
303 } while (*p != 0x00 && len > 0);
304
305 return n;
306}
307
308static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
309{
310 unsigned char l, n = 0;
311 char callsign[11];
312
313 do {
314 switch (*p & 0xC0) {
315 case 0x00:
316 p += 2;
317 n += 2;
318 len -= 2;
319 break;
320
321 case 0x40:
322 p += 3;
323 n += 3;
324 len -= 3;
325 break;
326
327 case 0x80:
328 p += 4;
329 n += 4;
330 len -= 4;
331 break;
332
333 case 0xC0:
334 l = p[1];
335 if (*p == FAC_CCITT_DEST_NSAP) {
336 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
337 memcpy(callsign, p + 12, l - 10);
338 callsign[l - 10] = '\0';
339 asc2ax(&facilities->source_call, callsign);
340 }
341 if (*p == FAC_CCITT_SRC_NSAP) {
342 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
343 memcpy(callsign, p + 12, l - 10);
344 callsign[l - 10] = '\0';
345 asc2ax(&facilities->dest_call, callsign);
346 }
347 p += l + 2;
348 n += l + 2;
349 len -= l + 2;
350 break;
351 }
352 } while (*p != 0x00 && len > 0);
353
354 return n;
355}
356
357int rose_parse_facilities(unsigned char *p,
358 struct rose_facilities_struct *facilities)
359{
360 int facilities_len, len;
361
362 facilities_len = *p++;
363
364 if (facilities_len == 0)
365 return 0;
366
367 while (facilities_len > 0) {
368 if (*p == 0x00) {
369 facilities_len--;
370 p++;
371
372 switch (*p) {
373 case FAC_NATIONAL:
374 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
375 facilities_len -= len + 1;
376 p += len + 1;
377 break;
378
379 case FAC_CCITT:
380 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
381 facilities_len -= len + 1;
382 p += len + 1;
383 break;
384
385 default:
386 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
387 facilities_len--;
388 p++;
389 break;
390 }
391 } else
392 break;
393 }
394
395 return 1;
396}
397
398static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
399{
400 unsigned char *p = buffer + 1;
401 char *callsign;
402 char buf[11];
403 int len, nb;
404
405
406 if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
407 *p++ = 0x00;
408 *p++ = FAC_NATIONAL;
409
410 if (rose->rand != 0) {
411 *p++ = FAC_NATIONAL_RAND;
412 *p++ = (rose->rand >> 8) & 0xFF;
413 *p++ = (rose->rand >> 0) & 0xFF;
414 }
415
416
417 if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
418 int maxdigi = 0;
419 *p++ = FAC_NATIONAL_DIGIS;
420 *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
421 for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
422 if (++maxdigi >= ROSE_MAX_DIGIS)
423 break;
424 memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
425 p[6] |= AX25_HBIT;
426 p += AX25_ADDR_LEN;
427 }
428 for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
429 if (++maxdigi >= ROSE_MAX_DIGIS)
430 break;
431 memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
432 p[6] &= ~AX25_HBIT;
433 p += AX25_ADDR_LEN;
434 }
435 }
436
437
438 if (rose->source_ndigis > 0) {
439 *p++ = FAC_NATIONAL_SRC_DIGI;
440 *p++ = AX25_ADDR_LEN;
441 memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
442 p += AX25_ADDR_LEN;
443 }
444
445
446 if (rose->dest_ndigis > 0) {
447 *p++ = FAC_NATIONAL_DEST_DIGI;
448 *p++ = AX25_ADDR_LEN;
449 memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
450 p += AX25_ADDR_LEN;
451 }
452 }
453
454 *p++ = 0x00;
455 *p++ = FAC_CCITT;
456
457 *p++ = FAC_CCITT_DEST_NSAP;
458
459 callsign = ax2asc(buf, &rose->dest_call);
460
461 *p++ = strlen(callsign) + 10;
462 *p++ = (strlen(callsign) + 9) * 2;
463
464 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
465 *p++ = ROSE_ADDR_LEN * 2;
466 memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
467 p += ROSE_ADDR_LEN;
468
469 memcpy(p, callsign, strlen(callsign));
470 p += strlen(callsign);
471
472 *p++ = FAC_CCITT_SRC_NSAP;
473
474 callsign = ax2asc(buf, &rose->source_call);
475
476 *p++ = strlen(callsign) + 10;
477 *p++ = (strlen(callsign) + 9) * 2;
478
479 *p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
480 *p++ = ROSE_ADDR_LEN * 2;
481 memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
482 p += ROSE_ADDR_LEN;
483
484 memcpy(p, callsign, strlen(callsign));
485 p += strlen(callsign);
486
487 len = p - buffer;
488 buffer[0] = len - 1;
489
490 return len;
491}
492
493void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
494{
495 struct rose_sock *rose = rose_sk(sk);
496
497 rose_stop_timer(sk);
498 rose_stop_idletimer(sk);
499
500 rose_clear_queues(sk);
501
502 rose->lci = 0;
503 rose->state = ROSE_STATE_0;
504
505 if (cause != -1)
506 rose->cause = cause;
507
508 if (diagnostic != -1)
509 rose->diagnostic = diagnostic;
510
511 sk->sk_state = TCP_CLOSE;
512 sk->sk_err = reason;
513 sk->sk_shutdown |= SEND_SHUTDOWN;
514
515 if (!sock_flag(sk, SOCK_DEAD)) {
516 sk->sk_state_change(sk);
517 sock_set_flag(sk, SOCK_DEAD);
518 }
519}
520
