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.
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.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>
19 #include <linux/inet.h>
20 #include <linux/netdevice.h>
21 #include <linux/skbuff.h>
23 #include <net/tcp_states.h>
24 #include <asm/system.h>
25 #include <linux/fcntl.h>
27 #include <linux/interrupt.h>
30 static int rose_create_facilities(unsigned char *buffer
, struct rose_sock
*rose
);
33 * This routine purges all of the queues of frames.
35 void rose_clear_queues(struct sock
*sk
)
37 skb_queue_purge(&sk
->sk_write_queue
);
38 skb_queue_purge(&rose_sk(sk
)->ack_queue
);
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
46 void rose_frames_acked(struct sock
*sk
, unsigned short nr
)
49 struct rose_sock
*rose
= rose_sk(sk
);
52 * Remove all the ack-ed frames from the ack queue.
55 while (skb_peek(&rose
->ack_queue
) != NULL
&& rose
->va
!= nr
) {
56 skb
= skb_dequeue(&rose
->ack_queue
);
58 rose
->va
= (rose
->va
+ 1) % ROSE_MODULUS
;
63 void rose_requeue_frames(struct sock
*sk
)
65 struct sk_buff
*skb
, *skb_prev
= NULL
;
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
72 while ((skb
= skb_dequeue(&rose_sk(sk
)->ack_queue
)) != NULL
) {
74 skb_queue_head(&sk
->sk_write_queue
, skb
);
76 skb_append(skb_prev
, skb
, &sk
->sk_write_queue
);
82 * Validate that the value of nr is between va and vs. Return true or
85 int rose_validate_nr(struct sock
*sk
, unsigned short nr
)
87 struct rose_sock
*rose
= rose_sk(sk
);
88 unsigned short vc
= rose
->va
;
90 while (vc
!= rose
->vs
) {
91 if (nr
== vc
) return 1;
92 vc
= (vc
+ 1) % ROSE_MODULUS
;
95 return nr
== rose
->vs
;
99 * This routine is called when the packet layer internally generates a
102 void rose_write_internal(struct sock
*sk
, int frametype
)
104 struct rose_sock
*rose
= rose_sk(sk
);
107 unsigned char lci1
, lci2
;
111 len
= AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
+ ROSE_MIN_LEN
+ 1;
114 case ROSE_CALL_REQUEST
:
115 len
+= 1 + ROSE_ADDR_LEN
+ ROSE_ADDR_LEN
;
116 faclen
= rose_create_facilities(buffer
, rose
);
119 case ROSE_CALL_ACCEPTED
:
120 case ROSE_CLEAR_REQUEST
:
121 case ROSE_RESET_REQUEST
:
126 if ((skb
= alloc_skb(len
, GFP_ATOMIC
)) == NULL
)
130 * Space for AX.25 header and PID.
132 skb_reserve(skb
, AX25_BPQ_HEADER_LEN
+ AX25_MAX_HEADER_LEN
+ 1);
134 dptr
= skb_put(skb
, skb_tailroom(skb
));
136 lci1
= (rose
->lci
>> 8) & 0x0F;
137 lci2
= (rose
->lci
>> 0) & 0xFF;
140 case ROSE_CALL_REQUEST
:
141 *dptr
++ = ROSE_GFI
| lci1
;
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
);
153 case ROSE_CALL_ACCEPTED
:
154 *dptr
++ = ROSE_GFI
| lci1
;
157 *dptr
++ = 0x00; /* Address length */
158 *dptr
++ = 0; /* Facilities length */
161 case ROSE_CLEAR_REQUEST
:
162 *dptr
++ = ROSE_GFI
| lci1
;
165 *dptr
++ = rose
->cause
;
166 *dptr
++ = rose
->diagnostic
;
169 case ROSE_RESET_REQUEST
:
170 *dptr
++ = ROSE_GFI
| lci1
;
173 *dptr
++ = ROSE_DTE_ORIGINATED
;
179 *dptr
++ = ROSE_GFI
| lci1
;
182 *dptr
++ |= (rose
->vr
<< 5) & 0xE0;
185 case ROSE_CLEAR_CONFIRMATION
:
186 case ROSE_RESET_CONFIRMATION
:
187 *dptr
++ = ROSE_GFI
| lci1
;
193 printk(KERN_ERR
"ROSE: rose_write_internal - invalid frametype %02X\n", frametype
);
198 rose_transmit_link(skb
, rose
->neighbour
);
201 int rose_decode(struct sk_buff
*skb
, int *ns
, int *nr
, int *q
, int *d
, int *m
)
203 unsigned char *frame
;
207 *ns
= *nr
= *q
= *d
= *m
= 0;
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
:
221 if ((frame
[2] & 0x1F) == ROSE_RR
||
222 (frame
[2] & 0x1F) == ROSE_RNR
) {
223 *nr
= (frame
[2] >> 5) & 0x07;
224 return frame
[2] & 0x1F;
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;
239 static int rose_parse_national(unsigned char *p
, struct rose_facilities_struct
*facilities
, int len
)
242 unsigned char l
, lg
, n
= 0;
243 int fac_national_digis_received
= 0;
254 if (*p
== FAC_NATIONAL_RAND
)
255 facilities
->rand
= ((p
[1] << 8) & 0xFF00) + ((p
[2] << 0) & 0x00FF);
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;
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;
281 else if (*p
== FAC_NATIONAL_FAIL_CALL
) {
282 memcpy(&facilities
->fail_call
, p
+ 2, AX25_ADDR_LEN
);
284 else if (*p
== FAC_NATIONAL_FAIL_ADD
) {
285 memcpy(&facilities
->fail_addr
, p
+ 3, ROSE_ADDR_LEN
);
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 if (facilities
->dest_ndigis
>= ROSE_MAX_DIGIS
)
295 memcpy(&facilities
->dest_digis
[facilities
->dest_ndigis
++], pt
, AX25_ADDR_LEN
);
297 if (facilities
->source_ndigis
>= ROSE_MAX_DIGIS
)
299 memcpy(&facilities
->source_digis
[facilities
->source_ndigis
++], pt
, AX25_ADDR_LEN
);
308 } while (*p
!= 0x00 && len
> 0);
313 static int rose_parse_ccitt(unsigned char *p
, struct rose_facilities_struct
*facilities
, int len
)
315 unsigned char l
, n
= 0;
341 /* Prevent overflows*/
342 if (l
< 10 || l
> 20)
345 if (*p
== FAC_CCITT_DEST_NSAP
) {
346 memcpy(&facilities
->source_addr
, p
+ 7, ROSE_ADDR_LEN
);
347 memcpy(callsign
, p
+ 12, l
- 10);
348 callsign
[l
- 10] = '\0';
349 asc2ax(&facilities
->source_call
, callsign
);
351 if (*p
== FAC_CCITT_SRC_NSAP
) {
352 memcpy(&facilities
->dest_addr
, p
+ 7, ROSE_ADDR_LEN
);
353 memcpy(callsign
, p
+ 12, l
- 10);
354 callsign
[l
- 10] = '\0';
355 asc2ax(&facilities
->dest_call
, callsign
);
362 } while (*p
!= 0x00 && len
> 0);
367 int rose_parse_facilities(unsigned char *p
,
368 struct rose_facilities_struct
*facilities
)
370 int facilities_len
, len
;
372 facilities_len
= *p
++;
374 if (facilities_len
== 0)
377 while (facilities_len
> 0) {
383 case FAC_NATIONAL
: /* National */
384 len
= rose_parse_national(p
+ 1, facilities
, facilities_len
- 1);
387 facilities_len
-= len
+ 1;
391 case FAC_CCITT
: /* CCITT */
392 len
= rose_parse_ccitt(p
+ 1, facilities
, facilities_len
- 1);
395 facilities_len
-= len
+ 1;
400 printk(KERN_DEBUG
"ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p
);
406 break; /* Error in facilities format */
412 static int rose_create_facilities(unsigned char *buffer
, struct rose_sock
*rose
)
414 unsigned char *p
= buffer
+ 1;
419 /* National Facilities */
420 if (rose
->rand
!= 0 || rose
->source_ndigis
== 1 || rose
->dest_ndigis
== 1) {
424 if (rose
->rand
!= 0) {
425 *p
++ = FAC_NATIONAL_RAND
;
426 *p
++ = (rose
->rand
>> 8) & 0xFF;
427 *p
++ = (rose
->rand
>> 0) & 0xFF;
430 /* Sent before older facilities */
431 if ((rose
->source_ndigis
> 0) || (rose
->dest_ndigis
> 0)) {
433 *p
++ = FAC_NATIONAL_DIGIS
;
434 *p
++ = AX25_ADDR_LEN
* (rose
->source_ndigis
+ rose
->dest_ndigis
);
435 for (nb
= 0 ; nb
< rose
->source_ndigis
; nb
++) {
436 if (++maxdigi
>= ROSE_MAX_DIGIS
)
438 memcpy(p
, &rose
->source_digis
[nb
], AX25_ADDR_LEN
);
442 for (nb
= 0 ; nb
< rose
->dest_ndigis
; nb
++) {
443 if (++maxdigi
>= ROSE_MAX_DIGIS
)
445 memcpy(p
, &rose
->dest_digis
[nb
], AX25_ADDR_LEN
);
451 /* For compatibility */
452 if (rose
->source_ndigis
> 0) {
453 *p
++ = FAC_NATIONAL_SRC_DIGI
;
454 *p
++ = AX25_ADDR_LEN
;
455 memcpy(p
, &rose
->source_digis
[0], AX25_ADDR_LEN
);
459 /* For compatibility */
460 if (rose
->dest_ndigis
> 0) {
461 *p
++ = FAC_NATIONAL_DEST_DIGI
;
462 *p
++ = AX25_ADDR_LEN
;
463 memcpy(p
, &rose
->dest_digis
[0], AX25_ADDR_LEN
);
471 *p
++ = FAC_CCITT_DEST_NSAP
;
473 callsign
= ax2asc(buf
, &rose
->dest_call
);
475 *p
++ = strlen(callsign
) + 10;
476 *p
++ = (strlen(callsign
) + 9) * 2; /* ??? */
478 *p
++ = 0x47; *p
++ = 0x00; *p
++ = 0x11;
479 *p
++ = ROSE_ADDR_LEN
* 2;
480 memcpy(p
, &rose
->dest_addr
, ROSE_ADDR_LEN
);
483 memcpy(p
, callsign
, strlen(callsign
));
484 p
+= strlen(callsign
);
486 *p
++ = FAC_CCITT_SRC_NSAP
;
488 callsign
= ax2asc(buf
, &rose
->source_call
);
490 *p
++ = strlen(callsign
) + 10;
491 *p
++ = (strlen(callsign
) + 9) * 2; /* ??? */
493 *p
++ = 0x47; *p
++ = 0x00; *p
++ = 0x11;
494 *p
++ = ROSE_ADDR_LEN
* 2;
495 memcpy(p
, &rose
->source_addr
, ROSE_ADDR_LEN
);
498 memcpy(p
, callsign
, strlen(callsign
));
499 p
+= strlen(callsign
);
507 void rose_disconnect(struct sock
*sk
, int reason
, int cause
, int diagnostic
)
509 struct rose_sock
*rose
= rose_sk(sk
);
512 rose_stop_idletimer(sk
);
514 rose_clear_queues(sk
);
517 rose
->state
= ROSE_STATE_0
;
522 if (diagnostic
!= -1)
523 rose
->diagnostic
= diagnostic
;
525 sk
->sk_state
= TCP_CLOSE
;
527 sk
->sk_shutdown
|= SEND_SHUTDOWN
;
529 if (!sock_flag(sk
, SOCK_DEAD
)) {
530 sk
->sk_state_change(sk
);
531 sock_set_flag(sk
, SOCK_DEAD
);