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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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
10 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
11 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
12 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
13 * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl)
14 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
15 */
16 #include <linux/capability.h>
17 #include <linux/module.h>
18 #include <linux/errno.h>
19 #include <linux/types.h>
20 #include <linux/socket.h>
21 #include <linux/in.h>
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/slab.h>
29 #include <net/ax25.h>
30 #include <linux/inet.h>
31 #include <linux/netdevice.h>
32 #include <linux/if_arp.h>
33 #include <linux/skbuff.h>
34 #include <net/sock.h>
35 #include <linux/uaccess.h>
36 #include <linux/fcntl.h>
37 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
38 #include <linux/mm.h>
39 #include <linux/interrupt.h>
40 #include <linux/notifier.h>
41 #include <linux/proc_fs.h>
42 #include <linux/stat.h>
43 #include <linux/sysctl.h>
44 #include <linux/init.h>
45 #include <linux/spinlock.h>
46 #include <net/net_namespace.h>
47 #include <net/tcp_states.h>
48 #include <net/ip.h>
49 #include <net/arp.h>
50
51
52
53 HLIST_HEAD(ax25_list);
54 DEFINE_SPINLOCK(ax25_list_lock);
55
56 static const struct proto_ops ax25_proto_ops;
57
58 static void ax25_free_sock(struct sock *sk)
59 {
60 ax25_cb_put(sk_to_ax25(sk));
61 }
62
63 /*
64 * Socket removal during an interrupt is now safe.
65 */
66 static void ax25_cb_del(ax25_cb *ax25)
67 {
68 if (!hlist_unhashed(&ax25->ax25_node)) {
69 spin_lock_bh(&ax25_list_lock);
70 hlist_del_init(&ax25->ax25_node);
71 spin_unlock_bh(&ax25_list_lock);
72 ax25_cb_put(ax25);
73 }
74 }
75
76 /*
77 * Kill all bound sockets on a dropped device.
78 */
79 static void ax25_kill_by_device(struct net_device *dev)
80 {
81 ax25_dev *ax25_dev;
82 ax25_cb *s;
83
84 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
85 return;
86
87 spin_lock_bh(&ax25_list_lock);
88 again:
89 ax25_for_each(s, &ax25_list) {
90 if (s->ax25_dev == ax25_dev) {
91 s->ax25_dev = NULL;
92 spin_unlock_bh(&ax25_list_lock);
93 ax25_disconnect(s, ENETUNREACH);
94 spin_lock_bh(&ax25_list_lock);
95
96 /* The entry could have been deleted from the
97 * list meanwhile and thus the next pointer is
98 * no longer valid. Play it safe and restart
99 * the scan. Forward progress is ensured
100 * because we set s->ax25_dev to NULL and we
101 * are never passed a NULL 'dev' argument.
102 */
103 goto again;
104 }
105 }
106 spin_unlock_bh(&ax25_list_lock);
107 }
108
109 /*
110 * Handle device status changes.
111 */
112 static int ax25_device_event(struct notifier_block *this, unsigned long event,
113 void *ptr)
114 {
115 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
116
117 if (!net_eq(dev_net(dev), &init_net))
118 return NOTIFY_DONE;
119
120 /* Reject non AX.25 devices */
121 if (dev->type != ARPHRD_AX25)
122 return NOTIFY_DONE;
123
124 switch (event) {
125 case NETDEV_UP:
126 ax25_dev_device_up(dev);
127 break;
128 case NETDEV_DOWN:
129 ax25_kill_by_device(dev);
130 ax25_rt_device_down(dev);
131 ax25_dev_device_down(dev);
132 break;
133 default:
134 break;
135 }
136
137 return NOTIFY_DONE;
138 }
139
140 /*
141 * Add a socket to the bound sockets list.
142 */
143 void ax25_cb_add(ax25_cb *ax25)
144 {
145 spin_lock_bh(&ax25_list_lock);
146 ax25_cb_hold(ax25);
147 hlist_add_head(&ax25->ax25_node, &ax25_list);
148 spin_unlock_bh(&ax25_list_lock);
149 }
150
151 /*
152 * Find a socket that wants to accept the SABM we have just
153 * received.
154 */
155 struct sock *ax25_find_listener(ax25_address *addr, int digi,
156 struct net_device *dev, int type)
157 {
158 ax25_cb *s;
159
160 spin_lock(&ax25_list_lock);
161 ax25_for_each(s, &ax25_list) {
162 if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
163 continue;
164 if (s->sk && !ax25cmp(&s->source_addr, addr) &&
165 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
166 /* If device is null we match any device */
167 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
168 sock_hold(s->sk);
169 spin_unlock(&ax25_list_lock);
170 return s->sk;
171 }
172 }
173 }
174 spin_unlock(&ax25_list_lock);
175
176 return NULL;
177 }
178
179 /*
180 * Find an AX.25 socket given both ends.
181 */
182 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
183 int type)
184 {
185 struct sock *sk = NULL;
186 ax25_cb *s;
187
188 spin_lock(&ax25_list_lock);
189 ax25_for_each(s, &ax25_list) {
190 if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
191 !ax25cmp(&s->dest_addr, dest_addr) &&
192 s->sk->sk_type == type) {
193 sk = s->sk;
194 sock_hold(sk);
195 break;
196 }
197 }
198
199 spin_unlock(&ax25_list_lock);
200
201 return sk;
202 }
203
204 /*
205 * Find an AX.25 control block given both ends. It will only pick up
206 * floating AX.25 control blocks or non Raw socket bound control blocks.
207 */
208 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
209 ax25_digi *digi, struct net_device *dev)
210 {
211 ax25_cb *s;
212
213 spin_lock_bh(&ax25_list_lock);
214 ax25_for_each(s, &ax25_list) {
215 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
216 continue;
217 if (s->ax25_dev == NULL)
218 continue;
219 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
220 if (digi != NULL && digi->ndigi != 0) {
221 if (s->digipeat == NULL)
222 continue;
223 if (ax25digicmp(s->digipeat, digi) != 0)
224 continue;
225 } else {
226 if (s->digipeat != NULL && s->digipeat->ndigi != 0)
227 continue;
228 }
229 ax25_cb_hold(s);
230 spin_unlock_bh(&ax25_list_lock);
231
232 return s;
233 }
234 }
235 spin_unlock_bh(&ax25_list_lock);
236
237 return NULL;
238 }
239
240 EXPORT_SYMBOL(ax25_find_cb);
241
242 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
243 {
244 ax25_cb *s;
245 struct sk_buff *copy;
246
247 spin_lock(&ax25_list_lock);
248 ax25_for_each(s, &ax25_list) {
249 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
250 s->sk->sk_type == SOCK_RAW &&
251 s->sk->sk_protocol == proto &&
252 s->ax25_dev->dev == skb->dev &&
253 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
254 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
255 continue;
256 if (sock_queue_rcv_skb(s->sk, copy) != 0)
257 kfree_skb(copy);
258 }
259 }
260 spin_unlock(&ax25_list_lock);
261 }
262
263 /*
264 * Deferred destroy.
265 */
266 void ax25_destroy_socket(ax25_cb *);
267
268 /*
269 * Handler for deferred kills.
270 */
271 static void ax25_destroy_timer(unsigned long data)
272 {
273 ax25_cb *ax25=(ax25_cb *)data;
274 struct sock *sk;
275
276 sk=ax25->sk;
277
278 bh_lock_sock(sk);
279 sock_hold(sk);
280 ax25_destroy_socket(ax25);
281 bh_unlock_sock(sk);
282 sock_put(sk);
283 }
284
285 /*
286 * This is called from user mode and the timers. Thus it protects itself
287 * against interrupt users but doesn't worry about being called during
288 * work. Once it is removed from the queue no interrupt or bottom half
289 * will touch it and we are (fairly 8-) ) safe.
290 */
291 void ax25_destroy_socket(ax25_cb *ax25)
292 {
293 struct sk_buff *skb;
294
295 ax25_cb_del(ax25);
296
297 ax25_stop_heartbeat(ax25);
298 ax25_stop_t1timer(ax25);
299 ax25_stop_t2timer(ax25);
300 ax25_stop_t3timer(ax25);
301 ax25_stop_idletimer(ax25);
302
303 ax25_clear_queues(ax25); /* Flush the queues */
304
305 if (ax25->sk != NULL) {
306 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
307 if (skb->sk != ax25->sk) {
308 /* A pending connection */
309 ax25_cb *sax25 = sk_to_ax25(skb->sk);
310
311 /* Queue the unaccepted socket for death */
312 sock_orphan(skb->sk);
313
314 /* 9A4GL: hack to release unaccepted sockets */
315 skb->sk->sk_state = TCP_LISTEN;
316
317 ax25_start_heartbeat(sax25);
318 sax25->state = AX25_STATE_0;
319 }
320
321 kfree_skb(skb);
322 }
323 skb_queue_purge(&ax25->sk->sk_write_queue);
324 }
325
326 if (ax25->sk != NULL) {
327 if (sk_has_allocations(ax25->sk)) {
328 /* Defer: outstanding buffers */
329 setup_timer(&ax25->dtimer, ax25_destroy_timer,
330 (unsigned long)ax25);
331 ax25->dtimer.expires = jiffies + 2 * HZ;
332 add_timer(&ax25->dtimer);
333 } else {
334 struct sock *sk=ax25->sk;
335 ax25->sk=NULL;
336 sock_put(sk);
337 }
338 } else {
339 ax25_cb_put(ax25);
340 }
341 }
342
343 /*
344 * dl1bke 960311: set parameters for existing AX.25 connections,
345 * includes a KILL command to abort any connection.
346 * VERY useful for debugging ;-)
347 */
348 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
349 {
350 struct ax25_ctl_struct ax25_ctl;
351 ax25_digi digi;
352 ax25_dev *ax25_dev;
353 ax25_cb *ax25;
354 unsigned int k;
355 int ret = 0;
356
357 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
358 return -EFAULT;
359
360 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
361 return -ENODEV;
362
363 if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
364 return -EINVAL;
365
366 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
367 return -EINVAL;
368
369 digi.ndigi = ax25_ctl.digi_count;
370 for (k = 0; k < digi.ndigi; k++)
371 digi.calls[k] = ax25_ctl.digi_addr[k];
372
373 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
374 return -ENOTCONN;
375
376 switch (ax25_ctl.cmd) {
377 case AX25_KILL:
378 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
379 #ifdef CONFIG_AX25_DAMA_SLAVE
380 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
381 ax25_dama_off(ax25);
382 #endif
383 ax25_disconnect(ax25, ENETRESET);
384 break;
385
386 case AX25_WINDOW:
387 if (ax25->modulus == AX25_MODULUS) {
388 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
389 goto einval_put;
390 } else {
391 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
392 goto einval_put;
393 }
394 ax25->window = ax25_ctl.arg;
395 break;
396
397 case AX25_T1:
398 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
399 goto einval_put;
400 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
401 ax25->t1 = ax25_ctl.arg * HZ;
402 break;
403
404 case AX25_T2:
405 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
406 goto einval_put;
407 ax25->t2 = ax25_ctl.arg * HZ;
408 break;
409
410 case AX25_N2:
411 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
412 goto einval_put;
413 ax25->n2count = 0;
414 ax25->n2 = ax25_ctl.arg;
415 break;
416
417 case AX25_T3:
418 if (ax25_ctl.arg > ULONG_MAX / HZ)
419 goto einval_put;
420 ax25->t3 = ax25_ctl.arg * HZ;
421 break;
422
423 case AX25_IDLE:
424 if (ax25_ctl.arg > ULONG_MAX / (60 * HZ))
425 goto einval_put;
426
427 ax25->idle = ax25_ctl.arg * 60 * HZ;
428 break;
429
430 case AX25_PACLEN:
431 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
432 goto einval_put;
433 ax25->paclen = ax25_ctl.arg;
434 break;
435
436 default:
437 goto einval_put;
438 }
439
440 out_put:
441 ax25_cb_put(ax25);
442 return ret;
443
444 einval_put:
445 ret = -EINVAL;
446 goto out_put;
447 }
448
449 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
450 {
451 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
452 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
453 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
454 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
455 ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
456 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
457 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
458 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
459
460 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
461 ax25->modulus = AX25_EMODULUS;
462 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
463 } else {
464 ax25->modulus = AX25_MODULUS;
465 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
466 }
467 }
468
469 /*
470 * Fill in a created AX.25 created control block with the default
471 * values for a particular device.
472 */
473 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
474 {
475 ax25->ax25_dev = ax25_dev;
476
477 if (ax25->ax25_dev != NULL) {
478 ax25_fillin_cb_from_dev(ax25, ax25_dev);
479 return;
480 }
481
482 /*
483 * No device, use kernel / AX.25 spec default values
484 */
485 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2;
486 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1);
487 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2);
488 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3);
489 ax25->n2 = AX25_DEF_N2;
490 ax25->paclen = AX25_DEF_PACLEN;
491 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE);
492 ax25->backoff = AX25_DEF_BACKOFF;
493
494 if (AX25_DEF_AXDEFMODE) {
495 ax25->modulus = AX25_EMODULUS;
496 ax25->window = AX25_DEF_EWINDOW;
497 } else {
498 ax25->modulus = AX25_MODULUS;
499 ax25->window = AX25_DEF_WINDOW;
500 }
501 }
502
503 /*
504 * Create an empty AX.25 control block.
505 */
506 ax25_cb *ax25_create_cb(void)
507 {
508 ax25_cb *ax25;
509
510 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
511 return NULL;
512
513 atomic_set(&ax25->refcount, 1);
514
515 skb_queue_head_init(&ax25->write_queue);
516 skb_queue_head_init(&ax25->frag_queue);
517 skb_queue_head_init(&ax25->ack_queue);
518 skb_queue_head_init(&ax25->reseq_queue);
519
520 ax25_setup_timers(ax25);
521
522 ax25_fillin_cb(ax25, NULL);
523
524 ax25->state = AX25_STATE_0;
525
526 return ax25;
527 }
528
529 /*
530 * Handling for system calls applied via the various interfaces to an
531 * AX25 socket object
532 */
533
534 static int ax25_setsockopt(struct socket *sock, int level, int optname,
535 char __user *optval, unsigned int optlen)
536 {
537 struct sock *sk = sock->sk;
538 ax25_cb *ax25;
539 struct net_device *dev;
540 char devname[IFNAMSIZ];
541 unsigned long opt;
542 int res = 0;
543
544 if (level != SOL_AX25)
545 return -ENOPROTOOPT;
546
547 if (optlen < sizeof(unsigned int))
548 return -EINVAL;
549
550 if (get_user(opt, (unsigned int __user *)optval))
551 return -EFAULT;
552
553 lock_sock(sk);
554 ax25 = sk_to_ax25(sk);
555
556 switch (optname) {
557 case AX25_WINDOW:
558 if (ax25->modulus == AX25_MODULUS) {
559 if (opt < 1 || opt > 7) {
560 res = -EINVAL;
561 break;
562 }
563 } else {
564 if (opt < 1 || opt > 63) {
565 res = -EINVAL;
566 break;
567 }
568 }
569 ax25->window = opt;
570 break;
571
572 case AX25_T1:
573 if (opt < 1 || opt > ULONG_MAX / HZ) {
574 res = -EINVAL;
575 break;
576 }
577 ax25->rtt = (opt * HZ) >> 1;
578 ax25->t1 = opt * HZ;
579 break;
580
581 case AX25_T2:
582 if (opt < 1 || opt > ULONG_MAX / HZ) {
583 res = -EINVAL;
584 break;
585 }
586 ax25->t2 = opt * HZ;
587 break;
588
589 case AX25_N2:
590 if (opt < 1 || opt > 31) {
591 res = -EINVAL;
592 break;
593 }
594 ax25->n2 = opt;
595 break;
596
597 case AX25_T3:
598 if (opt < 1 || opt > ULONG_MAX / HZ) {
599 res = -EINVAL;
600 break;
601 }
602 ax25->t3 = opt * HZ;
603 break;
604
605 case AX25_IDLE:
606 if (opt > ULONG_MAX / (60 * HZ)) {
607 res = -EINVAL;
608 break;
609 }
610 ax25->idle = opt * 60 * HZ;
611 break;
612
613 case AX25_BACKOFF:
614 if (opt > 2) {
615 res = -EINVAL;
616 break;
617 }
618 ax25->backoff = opt;
619 break;
620
621 case AX25_EXTSEQ:
622 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
623 break;
624
625 case AX25_PIDINCL:
626 ax25->pidincl = opt ? 1 : 0;
627 break;
628
629 case AX25_IAMDIGI:
630 ax25->iamdigi = opt ? 1 : 0;
631 break;
632
633 case AX25_PACLEN:
634 if (opt < 16 || opt > 65535) {
635 res = -EINVAL;
636 break;
637 }
638 ax25->paclen = opt;
639 break;
640
641 case SO_BINDTODEVICE:
642 if (optlen > IFNAMSIZ)
643 optlen = IFNAMSIZ;
644
645 if (copy_from_user(devname, optval, optlen)) {
646 res = -EFAULT;
647 break;
648 }
649
650 if (sk->sk_type == SOCK_SEQPACKET &&
651 (sock->state != SS_UNCONNECTED ||
652 sk->sk_state == TCP_LISTEN)) {
653 res = -EADDRNOTAVAIL;
654 break;
655 }
656
657 dev = dev_get_by_name(&init_net, devname);
658 if (!dev) {
659 res = -ENODEV;
660 break;
661 }
662
663 ax25->ax25_dev = ax25_dev_ax25dev(dev);
664 ax25_fillin_cb(ax25, ax25->ax25_dev);
665 dev_put(dev);
666 break;
667
668 default:
669 res = -ENOPROTOOPT;
670 }
671 release_sock(sk);
672
673 return res;
674 }
675
676 static int ax25_getsockopt(struct socket *sock, int level, int optname,
677 char __user *optval, int __user *optlen)
678 {
679 struct sock *sk = sock->sk;
680 ax25_cb *ax25;
681 struct ax25_dev *ax25_dev;
682 char devname[IFNAMSIZ];
683 void *valptr;
684 int val = 0;
685 int maxlen, length;
686
687 if (level != SOL_AX25)
688 return -ENOPROTOOPT;
689
690 if (get_user(maxlen, optlen))
691 return -EFAULT;
692
693 if (maxlen < 1)
694 return -EFAULT;
695
696 valptr = (void *) &val;
697 length = min_t(unsigned int, maxlen, sizeof(int));
698
699 lock_sock(sk);
700 ax25 = sk_to_ax25(sk);
701
702 switch (optname) {
703 case AX25_WINDOW:
704 val = ax25->window;
705 break;
706
707 case AX25_T1:
708 val = ax25->t1 / HZ;
709 break;
710
711 case AX25_T2:
712 val = ax25->t2 / HZ;
713 break;
714
715 case AX25_N2:
716 val = ax25->n2;
717 break;
718
719 case AX25_T3:
720 val = ax25->t3 / HZ;
721 break;
722
723 case AX25_IDLE:
724 val = ax25->idle / (60 * HZ);
725 break;
726
727 case AX25_BACKOFF:
728 val = ax25->backoff;
729 break;
730
731 case AX25_EXTSEQ:
732 val = (ax25->modulus == AX25_EMODULUS);
733 break;
734
735 case AX25_PIDINCL:
736 val = ax25->pidincl;
737 break;
738
739 case AX25_IAMDIGI:
740 val = ax25->iamdigi;
741 break;
742
743 case AX25_PACLEN:
744 val = ax25->paclen;
745 break;
746
747 case SO_BINDTODEVICE:
748 ax25_dev = ax25->ax25_dev;
749
750 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
751 strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
752 length = strlen(devname) + 1;
753 } else {
754 *devname = '\0';
755 length = 1;
756 }
757
758 valptr = (void *) devname;
759 break;
760
761 default:
762 release_sock(sk);
763 return -ENOPROTOOPT;
764 }
765 release_sock(sk);
766
767 if (put_user(length, optlen))
768 return -EFAULT;
769
770 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
771 }
772
773 static int ax25_listen(struct socket *sock, int backlog)
774 {
775 struct sock *sk = sock->sk;
776 int res = 0;
777
778 lock_sock(sk);
779 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
780 sk->sk_max_ack_backlog = backlog;
781 sk->sk_state = TCP_LISTEN;
782 goto out;
783 }
784 res = -EOPNOTSUPP;
785
786 out:
787 release_sock(sk);
788
789 return res;
790 }
791
792 /*
793 * XXX: when creating ax25_sock we should update the .obj_size setting
794 * below.
795 */
796 static struct proto ax25_proto = {
797 .name = "AX25",
798 .owner = THIS_MODULE,
799 .obj_size = sizeof(struct ax25_sock),
800 };
801
802 static int ax25_create(struct net *net, struct socket *sock, int protocol,
803 int kern)
804 {
805 struct sock *sk;
806 ax25_cb *ax25;
807
808 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
809 return -EINVAL;
810
811 if (!net_eq(net, &init_net))
812 return -EAFNOSUPPORT;
813
814 switch (sock->type) {
815 case SOCK_DGRAM:
816 if (protocol == 0 || protocol == PF_AX25)
817 protocol = AX25_P_TEXT;
818 break;
819
820 case SOCK_SEQPACKET:
821 switch (protocol) {
822 case 0:
823 case PF_AX25: /* For CLX */
824 protocol = AX25_P_TEXT;
825 break;
826 case AX25_P_SEGMENT:
827 #ifdef CONFIG_INET
828 case AX25_P_ARP:
829 case AX25_P_IP:
830 #endif
831 #ifdef CONFIG_NETROM
832 case AX25_P_NETROM:
833 #endif
834 #ifdef CONFIG_ROSE
835 case AX25_P_ROSE:
836 #endif
837 return -ESOCKTNOSUPPORT;
838 #ifdef CONFIG_NETROM_MODULE
839 case AX25_P_NETROM:
840 if (ax25_protocol_is_registered(AX25_P_NETROM))
841 return -ESOCKTNOSUPPORT;
842 break;
843 #endif
844 #ifdef CONFIG_ROSE_MODULE
845 case AX25_P_ROSE:
846 if (ax25_protocol_is_registered(AX25_P_ROSE))
847 return -ESOCKTNOSUPPORT;
848 #endif
849 default:
850 break;
851 }
852 break;
853
854 case SOCK_RAW:
855 break;
856 default:
857 return -ESOCKTNOSUPPORT;
858 }
859
860 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
861 if (sk == NULL)
862 return -ENOMEM;
863
864 ax25 = ax25_sk(sk)->cb = ax25_create_cb();
865 if (!ax25) {
866 sk_free(sk);
867 return -ENOMEM;
868 }
869
870 sock_init_data(sock, sk);
871
872 sk->sk_destruct = ax25_free_sock;
873 sock->ops = &ax25_proto_ops;
874 sk->sk_protocol = protocol;
875
876 ax25->sk = sk;
877
878 return 0;
879 }
880
881 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
882 {
883 struct sock *sk;
884 ax25_cb *ax25, *oax25;
885
886 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
887 if (sk == NULL)
888 return NULL;
889
890 if ((ax25 = ax25_create_cb()) == NULL) {
891 sk_free(sk);
892 return NULL;
893 }
894
895 switch (osk->sk_type) {
896 case SOCK_DGRAM:
897 break;
898 case SOCK_SEQPACKET:
899 break;
900 default:
901 sk_free(sk);
902 ax25_cb_put(ax25);
903 return NULL;
904 }
905
906 sock_init_data(NULL, sk);
907
908 sk->sk_type = osk->sk_type;
909 sk->sk_priority = osk->sk_priority;
910 sk->sk_protocol = osk->sk_protocol;
911 sk->sk_rcvbuf = osk->sk_rcvbuf;
912 sk->sk_sndbuf = osk->sk_sndbuf;
913 sk->sk_state = TCP_ESTABLISHED;
914 sock_copy_flags(sk, osk);
915
916 oax25 = sk_to_ax25(osk);
917
918 ax25->modulus = oax25->modulus;
919 ax25->backoff = oax25->backoff;
920 ax25->pidincl = oax25->pidincl;
921 ax25->iamdigi = oax25->iamdigi;
922 ax25->rtt = oax25->rtt;
923 ax25->t1 = oax25->t1;
924 ax25->t2 = oax25->t2;
925 ax25->t3 = oax25->t3;
926 ax25->n2 = oax25->n2;
927 ax25->idle = oax25->idle;
928 ax25->paclen = oax25->paclen;
929 ax25->window = oax25->window;
930
931 ax25->ax25_dev = ax25_dev;
932 ax25->source_addr = oax25->source_addr;
933
934 if (oax25->digipeat != NULL) {
935 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
936 GFP_ATOMIC);
937 if (ax25->digipeat == NULL) {
938 sk_free(sk);
939 ax25_cb_put(ax25);
940 return NULL;
941 }
942 }
943
944 ax25_sk(sk)->cb = ax25;
945 sk->sk_destruct = ax25_free_sock;
946 ax25->sk = sk;
947
948 return sk;
949 }
950
951 static int ax25_release(struct socket *sock)
952 {
953 struct sock *sk = sock->sk;
954 ax25_cb *ax25;
955
956 if (sk == NULL)
957 return 0;
958
959 sock_hold(sk);
960 sock_orphan(sk);
961 lock_sock(sk);
962 ax25 = sk_to_ax25(sk);
963
964 if (sk->sk_type == SOCK_SEQPACKET) {
965 switch (ax25->state) {
966 case AX25_STATE_0:
967 release_sock(sk);
968 ax25_disconnect(ax25, 0);
969 lock_sock(sk);
970 ax25_destroy_socket(ax25);
971 break;
972
973 case AX25_STATE_1:
974 case AX25_STATE_2:
975 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
976 release_sock(sk);
977 ax25_disconnect(ax25, 0);
978 lock_sock(sk);
979 if (!sock_flag(ax25->sk, SOCK_DESTROY))
980 ax25_destroy_socket(ax25);
981 break;
982
983 case AX25_STATE_3:
984 case AX25_STATE_4:
985 ax25_clear_queues(ax25);
986 ax25->n2count = 0;
987
988 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
989 case AX25_PROTO_STD_SIMPLEX:
990 case AX25_PROTO_STD_DUPLEX:
991 ax25_send_control(ax25,
992 AX25_DISC,
993 AX25_POLLON,
994 AX25_COMMAND);
995 ax25_stop_t2timer(ax25);
996 ax25_stop_t3timer(ax25);
997 ax25_stop_idletimer(ax25);
998 break;
999 #ifdef CONFIG_AX25_DAMA_SLAVE
1000 case AX25_PROTO_DAMA_SLAVE:
1001 ax25_stop_t3timer(ax25);
1002 ax25_stop_idletimer(ax25);
1003 break;
1004 #endif
1005 }
1006 ax25_calculate_t1(ax25);
1007 ax25_start_t1timer(ax25);
1008 ax25->state = AX25_STATE_2;
1009 sk->sk_state = TCP_CLOSE;
1010 sk->sk_shutdown |= SEND_SHUTDOWN;
1011 sk->sk_state_change(sk);
1012 sock_set_flag(sk, SOCK_DESTROY);
1013 break;
1014
1015 default:
1016 break;
1017 }
1018 } else {
1019 sk->sk_state = TCP_CLOSE;
1020 sk->sk_shutdown |= SEND_SHUTDOWN;
1021 sk->sk_state_change(sk);
1022 ax25_destroy_socket(ax25);
1023 }
1024
1025 sock->sk = NULL;
1026 release_sock(sk);
1027 sock_put(sk);
1028
1029 return 0;
1030 }
1031
1032 /*
1033 * We support a funny extension here so you can (as root) give any callsign
1034 * digipeated via a local address as source. This hack is obsolete now
1035 * that we've implemented support for SO_BINDTODEVICE. It is however small
1036 * and trivially backward compatible.
1037 */
1038 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1039 {
1040 struct sock *sk = sock->sk;
1041 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1042 ax25_dev *ax25_dev = NULL;
1043 ax25_uid_assoc *user;
1044 ax25_address call;
1045 ax25_cb *ax25;
1046 int err = 0;
1047
1048 if (addr_len != sizeof(struct sockaddr_ax25) &&
1049 addr_len != sizeof(struct full_sockaddr_ax25))
1050 /* support for old structure may go away some time
1051 * ax25_bind(): uses old (6 digipeater) socket structure.
1052 */
1053 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1054 (addr_len > sizeof(struct full_sockaddr_ax25)))
1055 return -EINVAL;
1056
1057 if (addr->fsa_ax25.sax25_family != AF_AX25)
1058 return -EINVAL;
1059
1060 user = ax25_findbyuid(current_euid());
1061 if (user) {
1062 call = user->call;
1063 ax25_uid_put(user);
1064 } else {
1065 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1066 return -EACCES;
1067
1068 call = addr->fsa_ax25.sax25_call;
1069 }
1070
1071 lock_sock(sk);
1072
1073 ax25 = sk_to_ax25(sk);
1074 if (!sock_flag(sk, SOCK_ZAPPED)) {
1075 err = -EINVAL;
1076 goto out;
1077 }
1078
1079 ax25->source_addr = call;
1080
1081 /*
1082 * User already set interface with SO_BINDTODEVICE
1083 */
1084 if (ax25->ax25_dev != NULL)
1085 goto done;
1086
1087 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1088 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1089 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1090 err = -EADDRNOTAVAIL;
1091 goto out;
1092 }
1093 } else {
1094 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1095 err = -EADDRNOTAVAIL;
1096 goto out;
1097 }
1098 }
1099
1100 if (ax25_dev != NULL)
1101 ax25_fillin_cb(ax25, ax25_dev);
1102
1103 done:
1104 ax25_cb_add(ax25);
1105 sock_reset_flag(sk, SOCK_ZAPPED);
1106
1107 out:
1108 release_sock(sk);
1109
1110 return err;
1111 }
1112
1113 /*
1114 * FIXME: nonblock behaviour looks like it may have a bug.
1115 */
1116 static int __must_check ax25_connect(struct socket *sock,
1117 struct sockaddr *uaddr, int addr_len, int flags)
1118 {
1119 struct sock *sk = sock->sk;
1120 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
1121 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1122 ax25_digi *digi = NULL;
1123 int ct = 0, err = 0;
1124
1125 /*
1126 * some sanity checks. code further down depends on this
1127 */
1128
1129 if (addr_len == sizeof(struct sockaddr_ax25))
1130 /* support for this will go away in early 2.5.x
1131 * ax25_connect(): uses obsolete socket structure
1132 */
1133 ;
1134 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1135 /* support for old structure may go away some time
1136 * ax25_connect(): uses old (6 digipeater) socket structure.
1137 */
1138 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1139 (addr_len > sizeof(struct full_sockaddr_ax25)))
1140 return -EINVAL;
1141
1142
1143 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1144 return -EINVAL;
1145
1146 lock_sock(sk);
1147
1148 /* deal with restarts */
1149 if (sock->state == SS_CONNECTING) {
1150 switch (sk->sk_state) {
1151 case TCP_SYN_SENT: /* still trying */
1152 err = -EINPROGRESS;
1153 goto out_release;
1154
1155 case TCP_ESTABLISHED: /* connection established */
1156 sock->state = SS_CONNECTED;
1157 goto out_release;
1158
1159 case TCP_CLOSE: /* connection refused */
1160 sock->state = SS_UNCONNECTED;
1161 err = -ECONNREFUSED;
1162 goto out_release;
1163 }
1164 }
1165
1166 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1167 err = -EISCONN; /* No reconnect on a seqpacket socket */
1168 goto out_release;
1169 }
1170
1171 sk->sk_state = TCP_CLOSE;
1172 sock->state = SS_UNCONNECTED;
1173
1174 kfree(ax25->digipeat);
1175 ax25->digipeat = NULL;
1176
1177 /*
1178 * Handle digi-peaters to be used.
1179 */
1180 if (addr_len > sizeof(struct sockaddr_ax25) &&
1181 fsa->fsa_ax25.sax25_ndigis != 0) {
1182 /* Valid number of digipeaters ? */
1183 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1184 err = -EINVAL;
1185 goto out_release;
1186 }
1187
1188 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1189 err = -ENOBUFS;
1190 goto out_release;
1191 }
1192
1193 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1194 digi->lastrepeat = -1;
1195
1196 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1197 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1198 AX25_HBIT) && ax25->iamdigi) {
1199 digi->repeated[ct] = 1;
1200 digi->lastrepeat = ct;
1201 } else {
1202 digi->repeated[ct] = 0;
1203 }
1204 digi->calls[ct] = fsa->fsa_digipeater[ct];
1205 ct++;
1206 }
1207 }
1208
1209 /*
1210 * Must bind first - autobinding in this may or may not work. If
1211 * the socket is already bound, check to see if the device has
1212 * been filled in, error if it hasn't.
1213 */
1214 if (sock_flag(sk, SOCK_ZAPPED)) {
1215 /* check if we can remove this feature. It is broken. */
1216 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1217 current->comm);
1218 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1219 kfree(digi);
1220 goto out_release;
1221 }
1222
1223 ax25_fillin_cb(ax25, ax25->ax25_dev);
1224 ax25_cb_add(ax25);
1225 } else {
1226 if (ax25->ax25_dev == NULL) {
1227 kfree(digi);
1228 err = -EHOSTUNREACH;
1229 goto out_release;
1230 }
1231 }
1232
1233 if (sk->sk_type == SOCK_SEQPACKET &&
1234 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1235 ax25->ax25_dev->dev))) {
1236 kfree(digi);
1237 err = -EADDRINUSE; /* Already such a connection */
1238 ax25_cb_put(ax25t);
1239 goto out_release;
1240 }
1241
1242 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1243 ax25->digipeat = digi;
1244
1245 /* First the easy one */
1246 if (sk->sk_type != SOCK_SEQPACKET) {
1247 sock->state = SS_CONNECTED;
1248 sk->sk_state = TCP_ESTABLISHED;
1249 goto out_release;
1250 }
1251
1252 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1253 sock->state = SS_CONNECTING;
1254 sk->sk_state = TCP_SYN_SENT;
1255
1256 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1257 case AX25_PROTO_STD_SIMPLEX:
1258 case AX25_PROTO_STD_DUPLEX:
1259 ax25_std_establish_data_link(ax25);
1260 break;
1261
1262 #ifdef CONFIG_AX25_DAMA_SLAVE
1263 case AX25_PROTO_DAMA_SLAVE:
1264 ax25->modulus = AX25_MODULUS;
1265 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1266 if (ax25->ax25_dev->dama.slave)
1267 ax25_ds_establish_data_link(ax25);
1268 else
1269 ax25_std_establish_data_link(ax25);
1270 break;
1271 #endif
1272 }
1273
1274 ax25->state = AX25_STATE_1;
1275
1276 ax25_start_heartbeat(ax25);
1277
1278 /* Now the loop */
1279 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1280 err = -EINPROGRESS;
1281 goto out_release;
1282 }
1283
1284 if (sk->sk_state == TCP_SYN_SENT) {
1285 DEFINE_WAIT(wait);
1286
1287 for (;;) {
1288 prepare_to_wait(sk_sleep(sk), &wait,
1289 TASK_INTERRUPTIBLE);
1290 if (sk->sk_state != TCP_SYN_SENT)
1291 break;
1292 if (!signal_pending(current)) {
1293 release_sock(sk);
1294 schedule();
1295 lock_sock(sk);
1296 continue;
1297 }
1298 err = -ERESTARTSYS;
1299 break;
1300 }
1301 finish_wait(sk_sleep(sk), &wait);
1302
1303 if (err)
1304 goto out_release;
1305 }
1306
1307 if (sk->sk_state != TCP_ESTABLISHED) {
1308 /* Not in ABM, not in WAIT_UA -> failed */
1309 sock->state = SS_UNCONNECTED;
1310 err = sock_error(sk); /* Always set at this point */
1311 goto out_release;
1312 }
1313
1314 sock->state = SS_CONNECTED;
1315
1316 err = 0;
1317 out_release:
1318 release_sock(sk);
1319
1320 return err;
1321 }
1322
1323 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
1324 {
1325 struct sk_buff *skb;
1326 struct sock *newsk;
1327 DEFINE_WAIT(wait);
1328 struct sock *sk;
1329 int err = 0;
1330
1331 if (sock->state != SS_UNCONNECTED)
1332 return -EINVAL;
1333
1334 if ((sk = sock->sk) == NULL)
1335 return -EINVAL;
1336
1337 lock_sock(sk);
1338 if (sk->sk_type != SOCK_SEQPACKET) {
1339 err = -EOPNOTSUPP;
1340 goto out;
1341 }
1342
1343 if (sk->sk_state != TCP_LISTEN) {
1344 err = -EINVAL;
1345 goto out;
1346 }
1347
1348 /*
1349 * The read queue this time is holding sockets ready to use
1350 * hooked into the SABM we saved
1351 */
1352 for (;;) {
1353 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1354 skb = skb_dequeue(&sk->sk_receive_queue);
1355 if (skb)
1356 break;
1357
1358 if (flags & O_NONBLOCK) {
1359 err = -EWOULDBLOCK;
1360 break;
1361 }
1362 if (!signal_pending(current)) {
1363 release_sock(sk);
1364 schedule();
1365 lock_sock(sk);
1366 continue;
1367 }
1368 err = -ERESTARTSYS;
1369 break;
1370 }
1371 finish_wait(sk_sleep(sk), &wait);
1372
1373 if (err)
1374 goto out;
1375
1376 newsk = skb->sk;
1377 sock_graft(newsk, newsock);
1378
1379 /* Now attach up the new socket */
1380 kfree_skb(skb);
1381 sk->sk_ack_backlog--;
1382 newsock->state = SS_CONNECTED;
1383
1384 out:
1385 release_sock(sk);
1386
1387 return err;
1388 }
1389
1390 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1391 int *uaddr_len, int peer)
1392 {
1393 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1394 struct sock *sk = sock->sk;
1395 unsigned char ndigi, i;
1396 ax25_cb *ax25;
1397 int err = 0;
1398
1399 memset(fsa, 0, sizeof(*fsa));
1400 lock_sock(sk);
1401 ax25 = sk_to_ax25(sk);
1402
1403 if (peer != 0) {
1404 if (sk->sk_state != TCP_ESTABLISHED) {
1405 err = -ENOTCONN;
1406 goto out;
1407 }
1408
1409 fsa->fsa_ax25.sax25_family = AF_AX25;
1410 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1411
1412 if (ax25->digipeat != NULL) {
1413 ndigi = ax25->digipeat->ndigi;
1414 fsa->fsa_ax25.sax25_ndigis = ndigi;
1415 for (i = 0; i < ndigi; i++)
1416 fsa->fsa_digipeater[i] =
1417 ax25->digipeat->calls[i];
1418 }
1419 } else {
1420 fsa->fsa_ax25.sax25_family = AF_AX25;
1421 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1422 fsa->fsa_ax25.sax25_ndigis = 1;
1423 if (ax25->ax25_dev != NULL) {
1424 memcpy(&fsa->fsa_digipeater[0],
1425 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1426 } else {
1427 fsa->fsa_digipeater[0] = null_ax25_address;
1428 }
1429 }
1430 *uaddr_len = sizeof (struct full_sockaddr_ax25);
1431
1432 out:
1433 release_sock(sk);
1434
1435 return err;
1436 }
1437
1438 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1439 {
1440 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1441 struct sock *sk = sock->sk;
1442 struct sockaddr_ax25 sax;
1443 struct sk_buff *skb;
1444 ax25_digi dtmp, *dp;
1445 ax25_cb *ax25;
1446 size_t size;
1447 int lv, err, addr_len = msg->msg_namelen;
1448
1449 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1450 return -EINVAL;
1451
1452 lock_sock(sk);
1453 ax25 = sk_to_ax25(sk);
1454
1455 if (sock_flag(sk, SOCK_ZAPPED)) {
1456 err = -EADDRNOTAVAIL;
1457 goto out;
1458 }
1459
1460 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1461 send_sig(SIGPIPE, current, 0);
1462 err = -EPIPE;
1463 goto out;
1464 }
1465
1466 if (ax25->ax25_dev == NULL) {
1467 err = -ENETUNREACH;
1468 goto out;
1469 }
1470
1471 if (len > ax25->ax25_dev->dev->mtu) {
1472 err = -EMSGSIZE;
1473 goto out;
1474 }
1475
1476 if (usax != NULL) {
1477 if (usax->sax25_family != AF_AX25) {
1478 err = -EINVAL;
1479 goto out;
1480 }
1481
1482 if (addr_len == sizeof(struct sockaddr_ax25))
1483 /* ax25_sendmsg(): uses obsolete socket structure */
1484 ;
1485 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1486 /* support for old structure may go away some time
1487 * ax25_sendmsg(): uses old (6 digipeater)
1488 * socket structure.
1489 */
1490 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1491 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1492 err = -EINVAL;
1493 goto out;
1494 }
1495
1496
1497 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1498 int ct = 0;
1499 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1500
1501 /* Valid number of digipeaters ? */
1502 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1503 err = -EINVAL;
1504 goto out;
1505 }
1506
1507 dtmp.ndigi = usax->sax25_ndigis;
1508
1509 while (ct < usax->sax25_ndigis) {
1510 dtmp.repeated[ct] = 0;
1511 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1512 ct++;
1513 }
1514
1515 dtmp.lastrepeat = 0;
1516 }
1517
1518 sax = *usax;
1519 if (sk->sk_type == SOCK_SEQPACKET &&
1520 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1521 err = -EISCONN;
1522 goto out;
1523 }
1524 if (usax->sax25_ndigis == 0)
1525 dp = NULL;
1526 else
1527 dp = &dtmp;
1528 } else {
1529 /*
1530 * FIXME: 1003.1g - if the socket is like this because
1531 * it has become closed (not started closed) and is VC
1532 * we ought to SIGPIPE, EPIPE
1533 */
1534 if (sk->sk_state != TCP_ESTABLISHED) {
1535 err = -ENOTCONN;
1536 goto out;
1537 }
1538 sax.sax25_family = AF_AX25;
1539 sax.sax25_call = ax25->dest_addr;
1540 dp = ax25->digipeat;
1541 }
1542
1543 /* Build a packet */
1544 /* Assume the worst case */
1545 size = len + ax25->ax25_dev->dev->hard_header_len;
1546
1547 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1548 if (skb == NULL)
1549 goto out;
1550
1551 skb_reserve(skb, size - len);
1552
1553 /* User data follows immediately after the AX.25 data */
1554 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1555 err = -EFAULT;
1556 kfree_skb(skb);
1557 goto out;
1558 }
1559
1560 skb_reset_network_header(skb);
1561
1562 /* Add the PID if one is not supplied by the user in the skb */
1563 if (!ax25->pidincl)
1564 *skb_push(skb, 1) = sk->sk_protocol;
1565
1566 if (sk->sk_type == SOCK_SEQPACKET) {
1567 /* Connected mode sockets go via the LAPB machine */
1568 if (sk->sk_state != TCP_ESTABLISHED) {
1569 kfree_skb(skb);
1570 err = -ENOTCONN;
1571 goto out;
1572 }
1573
1574 /* Shove it onto the queue and kick */
1575 ax25_output(ax25, ax25->paclen, skb);
1576
1577 err = len;
1578 goto out;
1579 }
1580
1581 skb_push(skb, 1 + ax25_addr_size(dp));
1582
1583 /* Building AX.25 Header */
1584
1585 /* Build an AX.25 header */
1586 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1587 dp, AX25_COMMAND, AX25_MODULUS);
1588
1589 skb_set_transport_header(skb, lv);
1590
1591 *skb_transport_header(skb) = AX25_UI;
1592
1593 /* Datagram frames go straight out of the door as UI */
1594 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1595
1596 err = len;
1597
1598 out:
1599 release_sock(sk);
1600
1601 return err;
1602 }
1603
1604 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1605 int flags)
1606 {
1607 struct sock *sk = sock->sk;
1608 struct sk_buff *skb;
1609 int copied;
1610 int err = 0;
1611
1612 lock_sock(sk);
1613 /*
1614 * This works for seqpacket too. The receiver has ordered the
1615 * queue for us! We do one quick check first though
1616 */
1617 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1618 err = -ENOTCONN;
1619 goto out;
1620 }
1621
1622 /* Now we can treat all alike */
1623 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1624 flags & MSG_DONTWAIT, &err);
1625 if (skb == NULL)
1626 goto out;
1627
1628 if (!sk_to_ax25(sk)->pidincl)
1629 skb_pull(skb, 1); /* Remove PID */
1630
1631 skb_reset_transport_header(skb);
1632 copied = skb->len;
1633
1634 if (copied > size) {
1635 copied = size;
1636 msg->msg_flags |= MSG_TRUNC;
1637 }
1638
1639 skb_copy_datagram_msg(skb, 0, msg, copied);
1640
1641 if (msg->msg_name) {
1642 ax25_digi digi;
1643 ax25_address src;
1644 const unsigned char *mac = skb_mac_header(skb);
1645 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1646
1647 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1648 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1649 &digi, NULL, NULL);
1650 sax->sax25_family = AF_AX25;
1651 /* We set this correctly, even though we may not let the
1652 application know the digi calls further down (because it
1653 did NOT ask to know them). This could get political... **/
1654 sax->sax25_ndigis = digi.ndigi;
1655 sax->sax25_call = src;
1656
1657 if (sax->sax25_ndigis != 0) {
1658 int ct;
1659 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1660
1661 for (ct = 0; ct < digi.ndigi; ct++)
1662 fsa->fsa_digipeater[ct] = digi.calls[ct];
1663 }
1664 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1665 }
1666
1667 skb_free_datagram(sk, skb);
1668 err = copied;
1669
1670 out:
1671 release_sock(sk);
1672
1673 return err;
1674 }
1675
1676 static int ax25_shutdown(struct socket *sk, int how)
1677 {
1678 /* FIXME - generate DM and RNR states */
1679 return -EOPNOTSUPP;
1680 }
1681
1682 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1683 {
1684 struct sock *sk = sock->sk;
1685 void __user *argp = (void __user *)arg;
1686 int res = 0;
1687
1688 lock_sock(sk);
1689 switch (cmd) {
1690 case TIOCOUTQ: {
1691 long amount;
1692
1693 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1694 if (amount < 0)
1695 amount = 0;
1696 res = put_user(amount, (int __user *)argp);
1697 break;
1698 }
1699
1700 case TIOCINQ: {
1701 struct sk_buff *skb;
1702 long amount = 0L;
1703 /* These two are safe on a single CPU system as only user tasks fiddle here */
1704 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1705 amount = skb->len;
1706 res = put_user(amount, (int __user *) argp);
1707 break;
1708 }
1709
1710 case SIOCGSTAMP:
1711 res = sock_get_timestamp(sk, argp);
1712 break;
1713
1714 case SIOCGSTAMPNS:
1715 res = sock_get_timestampns(sk, argp);
1716 break;
1717
1718 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1719 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1720 case SIOCAX25GETUID: {
1721 struct sockaddr_ax25 sax25;
1722 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1723 res = -EFAULT;
1724 break;
1725 }
1726 res = ax25_uid_ioctl(cmd, &sax25);
1727 break;
1728 }
1729
1730 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1731 long amount;
1732 if (!capable(CAP_NET_ADMIN)) {
1733 res = -EPERM;
1734 break;
1735 }
1736 if (get_user(amount, (long __user *)argp)) {
1737 res = -EFAULT;
1738 break;
1739 }
1740 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1741 res = -EINVAL;
1742 break;
1743 }
1744 ax25_uid_policy = amount;
1745 res = 0;
1746 break;
1747 }
1748
1749 case SIOCADDRT:
1750 case SIOCDELRT:
1751 case SIOCAX25OPTRT:
1752 if (!capable(CAP_NET_ADMIN)) {
1753 res = -EPERM;
1754 break;
1755 }
1756 res = ax25_rt_ioctl(cmd, argp);
1757 break;
1758
1759 case SIOCAX25CTLCON:
1760 if (!capable(CAP_NET_ADMIN)) {
1761 res = -EPERM;
1762 break;
1763 }
1764 res = ax25_ctl_ioctl(cmd, argp);
1765 break;
1766
1767 case SIOCAX25GETINFO:
1768 case SIOCAX25GETINFOOLD: {
1769 ax25_cb *ax25 = sk_to_ax25(sk);
1770 struct ax25_info_struct ax25_info;
1771
1772 ax25_info.t1 = ax25->t1 / HZ;
1773 ax25_info.t2 = ax25->t2 / HZ;
1774 ax25_info.t3 = ax25->t3 / HZ;
1775 ax25_info.idle = ax25->idle / (60 * HZ);
1776 ax25_info.n2 = ax25->n2;
1777 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1778 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1779 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1780 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1781 ax25_info.n2count = ax25->n2count;
1782 ax25_info.state = ax25->state;
1783 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1784 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1785 ax25_info.vs = ax25->vs;
1786 ax25_info.vr = ax25->vr;
1787 ax25_info.va = ax25->va;
1788 ax25_info.vs_max = ax25->vs; /* reserved */
1789 ax25_info.paclen = ax25->paclen;
1790 ax25_info.window = ax25->window;
1791
1792 /* old structure? */
1793 if (cmd == SIOCAX25GETINFOOLD) {
1794 static int warned = 0;
1795 if (!warned) {
1796 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1797 current->comm);
1798 warned=1;
1799 }
1800
1801 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1802 res = -EFAULT;
1803 break;
1804 }
1805 } else {
1806 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1807 res = -EINVAL;
1808 break;
1809 }
1810 }
1811 res = 0;
1812 break;
1813 }
1814
1815 case SIOCAX25ADDFWD:
1816 case SIOCAX25DELFWD: {
1817 struct ax25_fwd_struct ax25_fwd;
1818 if (!capable(CAP_NET_ADMIN)) {
1819 res = -EPERM;
1820 break;
1821 }
1822 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1823 res = -EFAULT;
1824 break;
1825 }
1826 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1827 break;
1828 }
1829
1830 case SIOCGIFADDR:
1831 case SIOCSIFADDR:
1832 case SIOCGIFDSTADDR:
1833 case SIOCSIFDSTADDR:
1834 case SIOCGIFBRDADDR:
1835 case SIOCSIFBRDADDR:
1836 case SIOCGIFNETMASK:
1837 case SIOCSIFNETMASK:
1838 case SIOCGIFMETRIC:
1839 case SIOCSIFMETRIC:
1840 res = -EINVAL;
1841 break;
1842
1843 default:
1844 res = -ENOIOCTLCMD;
1845 break;
1846 }
1847 release_sock(sk);
1848
1849 return res;
1850 }
1851
1852 #ifdef CONFIG_PROC_FS
1853
1854 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1855 __acquires(ax25_list_lock)
1856 {
1857 spin_lock_bh(&ax25_list_lock);
1858 return seq_hlist_start(&ax25_list, *pos);
1859 }
1860
1861 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1862 {
1863 return seq_hlist_next(v, &ax25_list, pos);
1864 }
1865
1866 static void ax25_info_stop(struct seq_file *seq, void *v)
1867 __releases(ax25_list_lock)
1868 {
1869 spin_unlock_bh(&ax25_list_lock);
1870 }
1871
1872 static int ax25_info_show(struct seq_file *seq, void *v)
1873 {
1874 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1875 char buf[11];
1876 int k;
1877
1878
1879 /*
1880 * New format:
1881 * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode
1882 */
1883
1884 seq_printf(seq, "%8.8lx %s %s%s ",
1885 (long) ax25,
1886 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1887 ax2asc(buf, &ax25->source_addr),
1888 ax25->iamdigi? "*":"");
1889 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1890
1891 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1892 seq_printf(seq, ",%s%s",
1893 ax2asc(buf, &ax25->digipeat->calls[k]),
1894 ax25->digipeat->repeated[k]? "*":"");
1895 }
1896
1897 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1898 ax25->state,
1899 ax25->vs, ax25->vr, ax25->va,
1900 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1901 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1902 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1903 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1904 ax25->idle / (60 * HZ),
1905 ax25->n2count, ax25->n2,
1906 ax25->rtt / HZ,
1907 ax25->window,
1908 ax25->paclen);
1909
1910 if (ax25->sk != NULL) {
1911 seq_printf(seq, " %d %d %lu\n",
1912 sk_wmem_alloc_get(ax25->sk),
1913 sk_rmem_alloc_get(ax25->sk),
1914 sock_i_ino(ax25->sk));
1915 } else {
1916 seq_puts(seq, " * * *\n");
1917 }
1918 return 0;
1919 }
1920
1921 static const struct seq_operations ax25_info_seqops = {
1922 .start = ax25_info_start,
1923 .next = ax25_info_next,
1924 .stop = ax25_info_stop,
1925 .show = ax25_info_show,
1926 };
1927
1928 static int ax25_info_open(struct inode *inode, struct file *file)
1929 {
1930 return seq_open(file, &ax25_info_seqops);
1931 }
1932
1933 static const struct file_operations ax25_info_fops = {
1934 .owner = THIS_MODULE,
1935 .open = ax25_info_open,
1936 .read = seq_read,
1937 .llseek = seq_lseek,
1938 .release = seq_release,
1939 };
1940
1941 #endif
1942
1943 static const struct net_proto_family ax25_family_ops = {
1944 .family = PF_AX25,
1945 .create = ax25_create,
1946 .owner = THIS_MODULE,
1947 };
1948
1949 static const struct proto_ops ax25_proto_ops = {
1950 .family = PF_AX25,
1951 .owner = THIS_MODULE,
1952 .release = ax25_release,
1953 .bind = ax25_bind,
1954 .connect = ax25_connect,
1955 .socketpair = sock_no_socketpair,
1956 .accept = ax25_accept,
1957 .getname = ax25_getname,
1958 .poll = datagram_poll,
1959 .ioctl = ax25_ioctl,
1960 .listen = ax25_listen,
1961 .shutdown = ax25_shutdown,
1962 .setsockopt = ax25_setsockopt,
1963 .getsockopt = ax25_getsockopt,
1964 .sendmsg = ax25_sendmsg,
1965 .recvmsg = ax25_recvmsg,
1966 .mmap = sock_no_mmap,
1967 .sendpage = sock_no_sendpage,
1968 };
1969
1970 /*
1971 * Called by socket.c on kernel start up
1972 */
1973 static struct packet_type ax25_packet_type __read_mostly = {
1974 .type = cpu_to_be16(ETH_P_AX25),
1975 .func = ax25_kiss_rcv,
1976 };
1977
1978 static struct notifier_block ax25_dev_notifier = {
1979 .notifier_call = ax25_device_event,
1980 };
1981
1982 static int __init ax25_init(void)
1983 {
1984 int rc = proto_register(&ax25_proto, 0);
1985
1986 if (rc != 0)
1987 goto out;
1988
1989 sock_register(&ax25_family_ops);
1990 dev_add_pack(&ax25_packet_type);
1991 register_netdevice_notifier(&ax25_dev_notifier);
1992
1993 proc_create("ax25_route", S_IRUGO, init_net.proc_net,
1994 &ax25_route_fops);
1995 proc_create("ax25", S_IRUGO, init_net.proc_net, &ax25_info_fops);
1996 proc_create("ax25_calls", S_IRUGO, init_net.proc_net, &ax25_uid_fops);
1997 out:
1998 return rc;
1999 }
2000 module_init(ax25_init);
2001
2002
2003 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
2004 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
2005 MODULE_LICENSE("GPL");
2006 MODULE_ALIAS_NETPROTO(PF_AX25);
2007
2008 static void __exit ax25_exit(void)
2009 {
2010 remove_proc_entry("ax25_route", init_net.proc_net);
2011 remove_proc_entry("ax25", init_net.proc_net);
2012 remove_proc_entry("ax25_calls", init_net.proc_net);
2013
2014 unregister_netdevice_notifier(&ax25_dev_notifier);
2015
2016 dev_remove_pack(&ax25_packet_type);
2017
2018 sock_unregister(PF_AX25);
2019 proto_unregister(&ax25_proto);
2020
2021 ax25_rt_free();
2022 ax25_uid_free();
2023 ax25_dev_free();
2024 }
2025 module_exit(ax25_exit);
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