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-rw-r--r--net/rose/rose_subr.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/net/rose/rose_subr.c b/net/rose/rose_subr.c
new file mode 100644
index 000000000000..7db7e1cedc3a
--- /dev/null
+++ b/net/rose/rose_subr.c
@@ -0,0 +1,519 @@
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
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);
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++ = 0xAA;
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 p += 2;
250 n += 2;
251 len -= 2;
252 break;
253
254 case 0x40:
255 if (*p == FAC_NATIONAL_RAND)
256 facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
257 p += 3;
258 n += 3;
259 len -= 3;
260 break;
261
262 case 0x80:
263 p += 4;
264 n += 4;
265 len -= 4;
266 break;
267
268 case 0xC0:
269 l = p[1];
270 if (*p == FAC_NATIONAL_DEST_DIGI) {
271 if (!fac_national_digis_received) {
272 memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
273 facilities->source_ndigis = 1;
274 }
275 }
276 else if (*p == FAC_NATIONAL_SRC_DIGI) {
277 if (!fac_national_digis_received) {
278 memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
279 facilities->dest_ndigis = 1;
280 }
281 }
282 else if (*p == FAC_NATIONAL_FAIL_CALL) {
283 memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
284 }
285 else if (*p == FAC_NATIONAL_FAIL_ADD) {
286 memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
287 }
288 else if (*p == FAC_NATIONAL_DIGIS) {
289 fac_national_digis_received = 1;
290 facilities->source_ndigis = 0;
291 facilities->dest_ndigis = 0;
292 for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
293 if (pt[6] & AX25_HBIT)
294 memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
295 else
296 memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
297 }
298 }
299 p += l + 2;
300 n += l + 2;
301 len -= l + 2;
302 break;
303 }
304 } while (*p != 0x00 && len > 0);
305
306 return n;
307}
308
309static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
310{
311 unsigned char l, n = 0;
312 char callsign[11];
313
314 do {
315 switch (*p & 0xC0) {
316 case 0x00:
317 p += 2;
318 n += 2;
319 len -= 2;
320 break;
321
322 case 0x40:
323 p += 3;
324 n += 3;
325 len -= 3;
326 break;
327
328 case 0x80:
329 p += 4;
330 n += 4;
331 len -= 4;
332 break;
333
334 case 0xC0:
335 l = p[1];
336 if (*p == FAC_CCITT_DEST_NSAP) {
337 memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
338 memcpy(callsign, p + 12, l - 10);
339 callsign[l - 10] = '\0';
340 facilities->source_call = *asc2ax(callsign);
341 }
342 if (*p == FAC_CCITT_SRC_NSAP) {
343 memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
344 memcpy(callsign, p + 12, l - 10);
345 callsign[l - 10] = '\0';
346 facilities->dest_call = *asc2ax(callsign);
347 }
348 p += l + 2;
349 n += l + 2;
350 len -= l + 2;
351 break;
352 }
353 } while (*p != 0x00 && len > 0);
354
355 return n;
356}
357
358int rose_parse_facilities(unsigned char *p,
359 struct rose_facilities_struct *facilities)
360{
361 int facilities_len, len;
362
363 facilities_len = *p++;
364
365 if (facilities_len == 0)
366 return 0;
367
368 while (facilities_len > 0) {
369 if (*p == 0x00) {
370 facilities_len--;
371 p++;
372
373 switch (*p) {
374 case FAC_NATIONAL: /* National */
375 len = rose_parse_national(p + 1, facilities, facilities_len - 1);
376 facilities_len -= len + 1;
377 p += len + 1;
378 break;
379
380 case FAC_CCITT: /* CCITT */
381 len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
382 facilities_len -= len + 1;
383 p += len + 1;
384 break;
385
386 default:
387 printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
388 facilities_len--;
389 p++;
390 break;
391 }
392 } else
393 break; /* Error in facilities format */
394 }
395
396 return 1;
397}
398
399static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
400{
401 unsigned char *p = buffer + 1;
402 char *callsign;
403 int len, nb;
404
405 /* National Facilities */
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 /* Sent before older facilities */
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 /* For compatibility */
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 /* For compatibility */
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(&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(&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}
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