Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-2.6.git] / net / rose / rose_subr.c
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 <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
30 static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);
31
32 /*
33  *      This routine purges all of the queues of frames.
34  */
35 void 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  */
46 void 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
63 void 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  */
85 int 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  */
102 void 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++ = 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;         /* 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
201 int 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
239 static 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
308 static 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
357 int 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:              /* 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:         /* 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;  /* Error in facilities format */
393         }
394
395         return 1;
396 }
397
398 static 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         /* 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(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
493 void 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 }