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Merge tag 'wireless-drivers-for-davem-2015-10-17' of git://git.kernel.org/pub/scm...
[linux-2.6/btrfs-unstable.git] / net / ax25 / af_ax25.c
blobae3a47f9d1d5298406ca33900624fe49c9c85719
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 <asm/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 (!net_eq(net, &init_net))
809 return -EAFNOSUPPORT;
810
811 switch (sock->type) {
812 case SOCK_DGRAM:
813 if (protocol == 0 || protocol == PF_AX25)
814 protocol = AX25_P_TEXT;
815 break;
816
817 case SOCK_SEQPACKET:
818 switch (protocol) {
819 case 0:
820 case PF_AX25: /* For CLX */
821 protocol = AX25_P_TEXT;
822 break;
823 case AX25_P_SEGMENT:
824 #ifdef CONFIG_INET
825 case AX25_P_ARP:
826 case AX25_P_IP:
827 #endif
828 #ifdef CONFIG_NETROM
829 case AX25_P_NETROM:
830 #endif
831 #ifdef CONFIG_ROSE
832 case AX25_P_ROSE:
833 #endif
834 return -ESOCKTNOSUPPORT;
835 #ifdef CONFIG_NETROM_MODULE
836 case AX25_P_NETROM:
837 if (ax25_protocol_is_registered(AX25_P_NETROM))
838 return -ESOCKTNOSUPPORT;
839 break;
840 #endif
841 #ifdef CONFIG_ROSE_MODULE
842 case AX25_P_ROSE:
843 if (ax25_protocol_is_registered(AX25_P_ROSE))
844 return -ESOCKTNOSUPPORT;
845 #endif
846 default:
847 break;
848 }
849 break;
850
851 case SOCK_RAW:
852 break;
853 default:
854 return -ESOCKTNOSUPPORT;
855 }
856
857 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
858 if (sk == NULL)
859 return -ENOMEM;
860
861 ax25 = ax25_sk(sk)->cb = ax25_create_cb();
862 if (!ax25) {
863 sk_free(sk);
864 return -ENOMEM;
865 }
866
867 sock_init_data(sock, sk);
868
869 sk->sk_destruct = ax25_free_sock;
870 sock->ops = &ax25_proto_ops;
871 sk->sk_protocol = protocol;
872
873 ax25->sk = sk;
874
875 return 0;
876 }
877
878 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
879 {
880 struct sock *sk;
881 ax25_cb *ax25, *oax25;
882
883 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
884 if (sk == NULL)
885 return NULL;
886
887 if ((ax25 = ax25_create_cb()) == NULL) {
888 sk_free(sk);
889 return NULL;
890 }
891
892 switch (osk->sk_type) {
893 case SOCK_DGRAM:
894 break;
895 case SOCK_SEQPACKET:
896 break;
897 default:
898 sk_free(sk);
899 ax25_cb_put(ax25);
900 return NULL;
901 }
902
903 sock_init_data(NULL, sk);
904
905 sk->sk_type = osk->sk_type;
906 sk->sk_priority = osk->sk_priority;
907 sk->sk_protocol = osk->sk_protocol;
908 sk->sk_rcvbuf = osk->sk_rcvbuf;
909 sk->sk_sndbuf = osk->sk_sndbuf;
910 sk->sk_state = TCP_ESTABLISHED;
911 sock_copy_flags(sk, osk);
912
913 oax25 = sk_to_ax25(osk);
914
915 ax25->modulus = oax25->modulus;
916 ax25->backoff = oax25->backoff;
917 ax25->pidincl = oax25->pidincl;
918 ax25->iamdigi = oax25->iamdigi;
919 ax25->rtt = oax25->rtt;
920 ax25->t1 = oax25->t1;
921 ax25->t2 = oax25->t2;
922 ax25->t3 = oax25->t3;
923 ax25->n2 = oax25->n2;
924 ax25->idle = oax25->idle;
925 ax25->paclen = oax25->paclen;
926 ax25->window = oax25->window;
927
928 ax25->ax25_dev = ax25_dev;
929 ax25->source_addr = oax25->source_addr;
930
931 if (oax25->digipeat != NULL) {
932 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
933 GFP_ATOMIC);
934 if (ax25->digipeat == NULL) {
935 sk_free(sk);
936 ax25_cb_put(ax25);
937 return NULL;
938 }
939 }
940
941 ax25_sk(sk)->cb = ax25;
942 sk->sk_destruct = ax25_free_sock;
943 ax25->sk = sk;
944
945 return sk;
946 }
947
948 static int ax25_release(struct socket *sock)
949 {
950 struct sock *sk = sock->sk;
951 ax25_cb *ax25;
952
953 if (sk == NULL)
954 return 0;
955
956 sock_hold(sk);
957 sock_orphan(sk);
958 lock_sock(sk);
959 ax25 = sk_to_ax25(sk);
960
961 if (sk->sk_type == SOCK_SEQPACKET) {
962 switch (ax25->state) {
963 case AX25_STATE_0:
964 release_sock(sk);
965 ax25_disconnect(ax25, 0);
966 lock_sock(sk);
967 ax25_destroy_socket(ax25);
968 break;
969
970 case AX25_STATE_1:
971 case AX25_STATE_2:
972 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
973 release_sock(sk);
974 ax25_disconnect(ax25, 0);
975 lock_sock(sk);
976 ax25_destroy_socket(ax25);
977 break;
978
979 case AX25_STATE_3:
980 case AX25_STATE_4:
981 ax25_clear_queues(ax25);
982 ax25->n2count = 0;
983
984 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
985 case AX25_PROTO_STD_SIMPLEX:
986 case AX25_PROTO_STD_DUPLEX:
987 ax25_send_control(ax25,
988 AX25_DISC,
989 AX25_POLLON,
990 AX25_COMMAND);
991 ax25_stop_t2timer(ax25);
992 ax25_stop_t3timer(ax25);
993 ax25_stop_idletimer(ax25);
994 break;
995 #ifdef CONFIG_AX25_DAMA_SLAVE
996 case AX25_PROTO_DAMA_SLAVE:
997 ax25_stop_t3timer(ax25);
998 ax25_stop_idletimer(ax25);
999 break;
1000 #endif
1001 }
1002 ax25_calculate_t1(ax25);
1003 ax25_start_t1timer(ax25);
1004 ax25->state = AX25_STATE_2;
1005 sk->sk_state = TCP_CLOSE;
1006 sk->sk_shutdown |= SEND_SHUTDOWN;
1007 sk->sk_state_change(sk);
1008 sock_set_flag(sk, SOCK_DESTROY);
1009 break;
1010
1011 default:
1012 break;
1013 }
1014 } else {
1015 sk->sk_state = TCP_CLOSE;
1016 sk->sk_shutdown |= SEND_SHUTDOWN;
1017 sk->sk_state_change(sk);
1018 ax25_destroy_socket(ax25);
1019 }
1020
1021 sock->sk = NULL;
1022 release_sock(sk);
1023 sock_put(sk);
1024
1025 return 0;
1026 }
1027
1028 /*
1029 * We support a funny extension here so you can (as root) give any callsign
1030 * digipeated via a local address as source. This hack is obsolete now
1031 * that we've implemented support for SO_BINDTODEVICE. It is however small
1032 * and trivially backward compatible.
1033 */
1034 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1035 {
1036 struct sock *sk = sock->sk;
1037 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1038 ax25_dev *ax25_dev = NULL;
1039 ax25_uid_assoc *user;
1040 ax25_address call;
1041 ax25_cb *ax25;
1042 int err = 0;
1043
1044 if (addr_len != sizeof(struct sockaddr_ax25) &&
1045 addr_len != sizeof(struct full_sockaddr_ax25))
1046 /* support for old structure may go away some time
1047 * ax25_bind(): uses old (6 digipeater) socket structure.
1048 */
1049 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1050 (addr_len > sizeof(struct full_sockaddr_ax25)))
1051 return -EINVAL;
1052
1053 if (addr->fsa_ax25.sax25_family != AF_AX25)
1054 return -EINVAL;
1055
1056 user = ax25_findbyuid(current_euid());
1057 if (user) {
1058 call = user->call;
1059 ax25_uid_put(user);
1060 } else {
1061 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1062 return -EACCES;
1063
1064 call = addr->fsa_ax25.sax25_call;
1065 }
1066
1067 lock_sock(sk);
1068
1069 ax25 = sk_to_ax25(sk);
1070 if (!sock_flag(sk, SOCK_ZAPPED)) {
1071 err = -EINVAL;
1072 goto out;
1073 }
1074
1075 ax25->source_addr = call;
1076
1077 /*
1078 * User already set interface with SO_BINDTODEVICE
1079 */
1080 if (ax25->ax25_dev != NULL)
1081 goto done;
1082
1083 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1084 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1085 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1086 err = -EADDRNOTAVAIL;
1087 goto out;
1088 }
1089 } else {
1090 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1091 err = -EADDRNOTAVAIL;
1092 goto out;
1093 }
1094 }
1095
1096 if (ax25_dev != NULL)
1097 ax25_fillin_cb(ax25, ax25_dev);
1098
1099 done:
1100 ax25_cb_add(ax25);
1101 sock_reset_flag(sk, SOCK_ZAPPED);
1102
1103 out:
1104 release_sock(sk);
1105
1106 return err;
1107 }
1108
1109 /*
1110 * FIXME: nonblock behaviour looks like it may have a bug.
1111 */
1112 static int __must_check ax25_connect(struct socket *sock,
1113 struct sockaddr *uaddr, int addr_len, int flags)
1114 {
1115 struct sock *sk = sock->sk;
1116 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
1117 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1118 ax25_digi *digi = NULL;
1119 int ct = 0, err = 0;
1120
1121 /*
1122 * some sanity checks. code further down depends on this
1123 */
1124
1125 if (addr_len == sizeof(struct sockaddr_ax25))
1126 /* support for this will go away in early 2.5.x
1127 * ax25_connect(): uses obsolete socket structure
1128 */
1129 ;
1130 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1131 /* support for old structure may go away some time
1132 * ax25_connect(): uses old (6 digipeater) socket structure.
1133 */
1134 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1135 (addr_len > sizeof(struct full_sockaddr_ax25)))
1136 return -EINVAL;
1137
1138
1139 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1140 return -EINVAL;
1141
1142 lock_sock(sk);
1143
1144 /* deal with restarts */
1145 if (sock->state == SS_CONNECTING) {
1146 switch (sk->sk_state) {
1147 case TCP_SYN_SENT: /* still trying */
1148 err = -EINPROGRESS;
1149 goto out_release;
1150
1151 case TCP_ESTABLISHED: /* connection established */
1152 sock->state = SS_CONNECTED;
1153 goto out_release;
1154
1155 case TCP_CLOSE: /* connection refused */
1156 sock->state = SS_UNCONNECTED;
1157 err = -ECONNREFUSED;
1158 goto out_release;
1159 }
1160 }
1161
1162 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1163 err = -EISCONN; /* No reconnect on a seqpacket socket */
1164 goto out_release;
1165 }
1166
1167 sk->sk_state = TCP_CLOSE;
1168 sock->state = SS_UNCONNECTED;
1169
1170 kfree(ax25->digipeat);
1171 ax25->digipeat = NULL;
1172
1173 /*
1174 * Handle digi-peaters to be used.
1175 */
1176 if (addr_len > sizeof(struct sockaddr_ax25) &&
1177 fsa->fsa_ax25.sax25_ndigis != 0) {
1178 /* Valid number of digipeaters ? */
1179 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1180 err = -EINVAL;
1181 goto out_release;
1182 }
1183
1184 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1185 err = -ENOBUFS;
1186 goto out_release;
1187 }
1188
1189 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1190 digi->lastrepeat = -1;
1191
1192 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1193 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1194 AX25_HBIT) && ax25->iamdigi) {
1195 digi->repeated[ct] = 1;
1196 digi->lastrepeat = ct;
1197 } else {
1198 digi->repeated[ct] = 0;
1199 }
1200 digi->calls[ct] = fsa->fsa_digipeater[ct];
1201 ct++;
1202 }
1203 }
1204
1205 /*
1206 * Must bind first - autobinding in this may or may not work. If
1207 * the socket is already bound, check to see if the device has
1208 * been filled in, error if it hasn't.
1209 */
1210 if (sock_flag(sk, SOCK_ZAPPED)) {
1211 /* check if we can remove this feature. It is broken. */
1212 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1213 current->comm);
1214 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1215 kfree(digi);
1216 goto out_release;
1217 }
1218
1219 ax25_fillin_cb(ax25, ax25->ax25_dev);
1220 ax25_cb_add(ax25);
1221 } else {
1222 if (ax25->ax25_dev == NULL) {
1223 kfree(digi);
1224 err = -EHOSTUNREACH;
1225 goto out_release;
1226 }
1227 }
1228
1229 if (sk->sk_type == SOCK_SEQPACKET &&
1230 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1231 ax25->ax25_dev->dev))) {
1232 kfree(digi);
1233 err = -EADDRINUSE; /* Already such a connection */
1234 ax25_cb_put(ax25t);
1235 goto out_release;
1236 }
1237
1238 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1239 ax25->digipeat = digi;
1240
1241 /* First the easy one */
1242 if (sk->sk_type != SOCK_SEQPACKET) {
1243 sock->state = SS_CONNECTED;
1244 sk->sk_state = TCP_ESTABLISHED;
1245 goto out_release;
1246 }
1247
1248 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1249 sock->state = SS_CONNECTING;
1250 sk->sk_state = TCP_SYN_SENT;
1251
1252 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1253 case AX25_PROTO_STD_SIMPLEX:
1254 case AX25_PROTO_STD_DUPLEX:
1255 ax25_std_establish_data_link(ax25);
1256 break;
1257
1258 #ifdef CONFIG_AX25_DAMA_SLAVE
1259 case AX25_PROTO_DAMA_SLAVE:
1260 ax25->modulus = AX25_MODULUS;
1261 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1262 if (ax25->ax25_dev->dama.slave)
1263 ax25_ds_establish_data_link(ax25);
1264 else
1265 ax25_std_establish_data_link(ax25);
1266 break;
1267 #endif
1268 }
1269
1270 ax25->state = AX25_STATE_1;
1271
1272 ax25_start_heartbeat(ax25);
1273
1274 /* Now the loop */
1275 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1276 err = -EINPROGRESS;
1277 goto out_release;
1278 }
1279
1280 if (sk->sk_state == TCP_SYN_SENT) {
1281 DEFINE_WAIT(wait);
1282
1283 for (;;) {
1284 prepare_to_wait(sk_sleep(sk), &wait,
1285 TASK_INTERRUPTIBLE);
1286 if (sk->sk_state != TCP_SYN_SENT)
1287 break;
1288 if (!signal_pending(current)) {
1289 release_sock(sk);
1290 schedule();
1291 lock_sock(sk);
1292 continue;
1293 }
1294 err = -ERESTARTSYS;
1295 break;
1296 }
1297 finish_wait(sk_sleep(sk), &wait);
1298
1299 if (err)
1300 goto out_release;
1301 }
1302
1303 if (sk->sk_state != TCP_ESTABLISHED) {
1304 /* Not in ABM, not in WAIT_UA -> failed */
1305 sock->state = SS_UNCONNECTED;
1306 err = sock_error(sk); /* Always set at this point */
1307 goto out_release;
1308 }
1309
1310 sock->state = SS_CONNECTED;
1311
1312 err = 0;
1313 out_release:
1314 release_sock(sk);
1315
1316 return err;
1317 }
1318
1319 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
1320 {
1321 struct sk_buff *skb;
1322 struct sock *newsk;
1323 DEFINE_WAIT(wait);
1324 struct sock *sk;
1325 int err = 0;
1326
1327 if (sock->state != SS_UNCONNECTED)
1328 return -EINVAL;
1329
1330 if ((sk = sock->sk) == NULL)
1331 return -EINVAL;
1332
1333 lock_sock(sk);
1334 if (sk->sk_type != SOCK_SEQPACKET) {
1335 err = -EOPNOTSUPP;
1336 goto out;
1337 }
1338
1339 if (sk->sk_state != TCP_LISTEN) {
1340 err = -EINVAL;
1341 goto out;
1342 }
1343
1344 /*
1345 * The read queue this time is holding sockets ready to use
1346 * hooked into the SABM we saved
1347 */
1348 for (;;) {
1349 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1350 skb = skb_dequeue(&sk->sk_receive_queue);
1351 if (skb)
1352 break;
1353
1354 if (flags & O_NONBLOCK) {
1355 err = -EWOULDBLOCK;
1356 break;
1357 }
1358 if (!signal_pending(current)) {
1359 release_sock(sk);
1360 schedule();
1361 lock_sock(sk);
1362 continue;
1363 }
1364 err = -ERESTARTSYS;
1365 break;
1366 }
1367 finish_wait(sk_sleep(sk), &wait);
1368
1369 if (err)
1370 goto out;
1371
1372 newsk = skb->sk;
1373 sock_graft(newsk, newsock);
1374
1375 /* Now attach up the new socket */
1376 kfree_skb(skb);
1377 sk->sk_ack_backlog--;
1378 newsock->state = SS_CONNECTED;
1379
1380 out:
1381 release_sock(sk);
1382
1383 return err;
1384 }
1385
1386 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1387 int *uaddr_len, int peer)
1388 {
1389 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1390 struct sock *sk = sock->sk;
1391 unsigned char ndigi, i;
1392 ax25_cb *ax25;
1393 int err = 0;
1394
1395 memset(fsa, 0, sizeof(*fsa));
1396 lock_sock(sk);
1397 ax25 = sk_to_ax25(sk);
1398
1399 if (peer != 0) {
1400 if (sk->sk_state != TCP_ESTABLISHED) {
1401 err = -ENOTCONN;
1402 goto out;
1403 }
1404
1405 fsa->fsa_ax25.sax25_family = AF_AX25;
1406 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1407
1408 if (ax25->digipeat != NULL) {
1409 ndigi = ax25->digipeat->ndigi;
1410 fsa->fsa_ax25.sax25_ndigis = ndigi;
1411 for (i = 0; i < ndigi; i++)
1412 fsa->fsa_digipeater[i] =
1413 ax25->digipeat->calls[i];
1414 }
1415 } else {
1416 fsa->fsa_ax25.sax25_family = AF_AX25;
1417 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1418 fsa->fsa_ax25.sax25_ndigis = 1;
1419 if (ax25->ax25_dev != NULL) {
1420 memcpy(&fsa->fsa_digipeater[0],
1421 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1422 } else {
1423 fsa->fsa_digipeater[0] = null_ax25_address;
1424 }
1425 }
1426 *uaddr_len = sizeof (struct full_sockaddr_ax25);
1427
1428 out:
1429 release_sock(sk);
1430
1431 return err;
1432 }
1433
1434 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1435 {
1436 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1437 struct sock *sk = sock->sk;
1438 struct sockaddr_ax25 sax;
1439 struct sk_buff *skb;
1440 ax25_digi dtmp, *dp;
1441 ax25_cb *ax25;
1442 size_t size;
1443 int lv, err, addr_len = msg->msg_namelen;
1444
1445 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1446 return -EINVAL;
1447
1448 lock_sock(sk);
1449 ax25 = sk_to_ax25(sk);
1450
1451 if (sock_flag(sk, SOCK_ZAPPED)) {
1452 err = -EADDRNOTAVAIL;
1453 goto out;
1454 }
1455
1456 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1457 send_sig(SIGPIPE, current, 0);
1458 err = -EPIPE;
1459 goto out;
1460 }
1461
1462 if (ax25->ax25_dev == NULL) {
1463 err = -ENETUNREACH;
1464 goto out;
1465 }
1466
1467 if (len > ax25->ax25_dev->dev->mtu) {
1468 err = -EMSGSIZE;
1469 goto out;
1470 }
1471
1472 if (usax != NULL) {
1473 if (usax->sax25_family != AF_AX25) {
1474 err = -EINVAL;
1475 goto out;
1476 }
1477
1478 if (addr_len == sizeof(struct sockaddr_ax25))
1479 /* ax25_sendmsg(): uses obsolete socket structure */
1480 ;
1481 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1482 /* support for old structure may go away some time
1483 * ax25_sendmsg(): uses old (6 digipeater)
1484 * socket structure.
1485 */
1486 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1487 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1488 err = -EINVAL;
1489 goto out;
1490 }
1491
1492
1493 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1494 int ct = 0;
1495 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1496
1497 /* Valid number of digipeaters ? */
1498 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1499 err = -EINVAL;
1500 goto out;
1501 }
1502
1503 dtmp.ndigi = usax->sax25_ndigis;
1504
1505 while (ct < usax->sax25_ndigis) {
1506 dtmp.repeated[ct] = 0;
1507 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1508 ct++;
1509 }
1510
1511 dtmp.lastrepeat = 0;
1512 }
1513
1514 sax = *usax;
1515 if (sk->sk_type == SOCK_SEQPACKET &&
1516 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1517 err = -EISCONN;
1518 goto out;
1519 }
1520 if (usax->sax25_ndigis == 0)
1521 dp = NULL;
1522 else
1523 dp = &dtmp;
1524 } else {
1525 /*
1526 * FIXME: 1003.1g - if the socket is like this because
1527 * it has become closed (not started closed) and is VC
1528 * we ought to SIGPIPE, EPIPE
1529 */
1530 if (sk->sk_state != TCP_ESTABLISHED) {
1531 err = -ENOTCONN;
1532 goto out;
1533 }
1534 sax.sax25_family = AF_AX25;
1535 sax.sax25_call = ax25->dest_addr;
1536 dp = ax25->digipeat;
1537 }
1538
1539 /* Build a packet */
1540 /* Assume the worst case */
1541 size = len + ax25->ax25_dev->dev->hard_header_len;
1542
1543 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1544 if (skb == NULL)
1545 goto out;
1546
1547 skb_reserve(skb, size - len);
1548
1549 /* User data follows immediately after the AX.25 data */
1550 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1551 err = -EFAULT;
1552 kfree_skb(skb);
1553 goto out;
1554 }
1555
1556 skb_reset_network_header(skb);
1557
1558 /* Add the PID if one is not supplied by the user in the skb */
1559 if (!ax25->pidincl)
1560 *skb_push(skb, 1) = sk->sk_protocol;
1561
1562 if (sk->sk_type == SOCK_SEQPACKET) {
1563 /* Connected mode sockets go via the LAPB machine */
1564 if (sk->sk_state != TCP_ESTABLISHED) {
1565 kfree_skb(skb);
1566 err = -ENOTCONN;
1567 goto out;
1568 }
1569
1570 /* Shove it onto the queue and kick */
1571 ax25_output(ax25, ax25->paclen, skb);
1572
1573 err = len;
1574 goto out;
1575 }
1576
1577 skb_push(skb, 1 + ax25_addr_size(dp));
1578
1579 /* Building AX.25 Header */
1580
1581 /* Build an AX.25 header */
1582 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1583 dp, AX25_COMMAND, AX25_MODULUS);
1584
1585 skb_set_transport_header(skb, lv);
1586
1587 *skb_transport_header(skb) = AX25_UI;
1588
1589 /* Datagram frames go straight out of the door as UI */
1590 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1591
1592 err = len;
1593
1594 out:
1595 release_sock(sk);
1596
1597 return err;
1598 }
1599
1600 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1601 int flags)
1602 {
1603 struct sock *sk = sock->sk;
1604 struct sk_buff *skb;
1605 int copied;
1606 int err = 0;
1607
1608 lock_sock(sk);
1609 /*
1610 * This works for seqpacket too. The receiver has ordered the
1611 * queue for us! We do one quick check first though
1612 */
1613 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1614 err = -ENOTCONN;
1615 goto out;
1616 }
1617
1618 /* Now we can treat all alike */
1619 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1620 flags & MSG_DONTWAIT, &err);
1621 if (skb == NULL)
1622 goto out;
1623
1624 if (!sk_to_ax25(sk)->pidincl)
1625 skb_pull(skb, 1); /* Remove PID */
1626
1627 skb_reset_transport_header(skb);
1628 copied = skb->len;
1629
1630 if (copied > size) {
1631 copied = size;
1632 msg->msg_flags |= MSG_TRUNC;
1633 }
1634
1635 skb_copy_datagram_msg(skb, 0, msg, copied);
1636
1637 if (msg->msg_name) {
1638 ax25_digi digi;
1639 ax25_address src;
1640 const unsigned char *mac = skb_mac_header(skb);
1641 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1642
1643 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1644 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1645 &digi, NULL, NULL);
1646 sax->sax25_family = AF_AX25;
1647 /* We set this correctly, even though we may not let the
1648 application know the digi calls further down (because it
1649 did NOT ask to know them). This could get political... **/
1650 sax->sax25_ndigis = digi.ndigi;
1651 sax->sax25_call = src;
1652
1653 if (sax->sax25_ndigis != 0) {
1654 int ct;
1655 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1656
1657 for (ct = 0; ct < digi.ndigi; ct++)
1658 fsa->fsa_digipeater[ct] = digi.calls[ct];
1659 }
1660 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1661 }
1662
1663 skb_free_datagram(sk, skb);
1664 err = copied;
1665
1666 out:
1667 release_sock(sk);
1668
1669 return err;
1670 }
1671
1672 static int ax25_shutdown(struct socket *sk, int how)
1673 {
1674 /* FIXME - generate DM and RNR states */
1675 return -EOPNOTSUPP;
1676 }
1677
1678 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1679 {
1680 struct sock *sk = sock->sk;
1681 void __user *argp = (void __user *)arg;
1682 int res = 0;
1683
1684 lock_sock(sk);
1685 switch (cmd) {
1686 case TIOCOUTQ: {
1687 long amount;
1688
1689 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1690 if (amount < 0)
1691 amount = 0;
1692 res = put_user(amount, (int __user *)argp);
1693 break;
1694 }
1695
1696 case TIOCINQ: {
1697 struct sk_buff *skb;
1698 long amount = 0L;
1699 /* These two are safe on a single CPU system as only user tasks fiddle here */
1700 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1701 amount = skb->len;
1702 res = put_user(amount, (int __user *) argp);
1703 break;
1704 }
1705
1706 case SIOCGSTAMP:
1707 res = sock_get_timestamp(sk, argp);
1708 break;
1709
1710 case SIOCGSTAMPNS:
1711 res = sock_get_timestampns(sk, argp);
1712 break;
1713
1714 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1715 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1716 case SIOCAX25GETUID: {
1717 struct sockaddr_ax25 sax25;
1718 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1719 res = -EFAULT;
1720 break;
1721 }
1722 res = ax25_uid_ioctl(cmd, &sax25);
1723 break;
1724 }
1725
1726 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1727 long amount;
1728 if (!capable(CAP_NET_ADMIN)) {
1729 res = -EPERM;
1730 break;
1731 }
1732 if (get_user(amount, (long __user *)argp)) {
1733 res = -EFAULT;
1734 break;
1735 }
1736 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1737 res = -EINVAL;
1738 break;
1739 }
1740 ax25_uid_policy = amount;
1741 res = 0;
1742 break;
1743 }
1744
1745 case SIOCADDRT:
1746 case SIOCDELRT:
1747 case SIOCAX25OPTRT:
1748 if (!capable(CAP_NET_ADMIN)) {
1749 res = -EPERM;
1750 break;
1751 }
1752 res = ax25_rt_ioctl(cmd, argp);
1753 break;
1754
1755 case SIOCAX25CTLCON:
1756 if (!capable(CAP_NET_ADMIN)) {
1757 res = -EPERM;
1758 break;
1759 }
1760 res = ax25_ctl_ioctl(cmd, argp);
1761 break;
1762
1763 case SIOCAX25GETINFO:
1764 case SIOCAX25GETINFOOLD: {
1765 ax25_cb *ax25 = sk_to_ax25(sk);
1766 struct ax25_info_struct ax25_info;
1767
1768 ax25_info.t1 = ax25->t1 / HZ;
1769 ax25_info.t2 = ax25->t2 / HZ;
1770 ax25_info.t3 = ax25->t3 / HZ;
1771 ax25_info.idle = ax25->idle / (60 * HZ);
1772 ax25_info.n2 = ax25->n2;
1773 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1774 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1775 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1776 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1777 ax25_info.n2count = ax25->n2count;
1778 ax25_info.state = ax25->state;
1779 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1780 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1781 ax25_info.vs = ax25->vs;
1782 ax25_info.vr = ax25->vr;
1783 ax25_info.va = ax25->va;
1784 ax25_info.vs_max = ax25->vs; /* reserved */
1785 ax25_info.paclen = ax25->paclen;
1786 ax25_info.window = ax25->window;
1787
1788 /* old structure? */
1789 if (cmd == SIOCAX25GETINFOOLD) {
1790 static int warned = 0;
1791 if (!warned) {
1792 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1793 current->comm);
1794 warned=1;
1795 }
1796
1797 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1798 res = -EFAULT;
1799 break;
1800 }
1801 } else {
1802 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1803 res = -EINVAL;
1804 break;
1805 }
1806 }
1807 res = 0;
1808 break;
1809 }
1810
1811 case SIOCAX25ADDFWD:
1812 case SIOCAX25DELFWD: {
1813 struct ax25_fwd_struct ax25_fwd;
1814 if (!capable(CAP_NET_ADMIN)) {
1815 res = -EPERM;
1816 break;
1817 }
1818 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1819 res = -EFAULT;
1820 break;
1821 }
1822 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1823 break;
1824 }
1825
1826 case SIOCGIFADDR:
1827 case SIOCSIFADDR:
1828 case SIOCGIFDSTADDR:
1829 case SIOCSIFDSTADDR:
1830 case SIOCGIFBRDADDR:
1831 case SIOCSIFBRDADDR:
1832 case SIOCGIFNETMASK:
1833 case SIOCSIFNETMASK:
1834 case SIOCGIFMETRIC:
1835 case SIOCSIFMETRIC:
1836 res = -EINVAL;
1837 break;
1838
1839 default:
1840 res = -ENOIOCTLCMD;
1841 break;
1842 }
1843 release_sock(sk);
1844
1845 return res;
1846 }
1847
1848 #ifdef CONFIG_PROC_FS
1849
1850 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1851 __acquires(ax25_list_lock)
1852 {
1853 spin_lock_bh(&ax25_list_lock);
1854 return seq_hlist_start(&ax25_list, *pos);
1855 }
1856
1857 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1858 {
1859 return seq_hlist_next(v, &ax25_list, pos);
1860 }
1861
1862 static void ax25_info_stop(struct seq_file *seq, void *v)
1863 __releases(ax25_list_lock)
1864 {
1865 spin_unlock_bh(&ax25_list_lock);
1866 }
1867
1868 static int ax25_info_show(struct seq_file *seq, void *v)
1869 {
1870 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1871 char buf[11];
1872 int k;
1873
1874
1875 /*
1876 * New format:
1877 * 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
1878 */
1879
1880 seq_printf(seq, "%8.8lx %s %s%s ",
1881 (long) ax25,
1882 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1883 ax2asc(buf, &ax25->source_addr),
1884 ax25->iamdigi? "*":"");
1885 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1886
1887 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1888 seq_printf(seq, ",%s%s",
1889 ax2asc(buf, &ax25->digipeat->calls[k]),
1890 ax25->digipeat->repeated[k]? "*":"");
1891 }
1892
1893 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1894 ax25->state,
1895 ax25->vs, ax25->vr, ax25->va,
1896 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1897 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1898 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1899 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1900 ax25->idle / (60 * HZ),
1901 ax25->n2count, ax25->n2,
1902 ax25->rtt / HZ,
1903 ax25->window,
1904 ax25->paclen);
1905
1906 if (ax25->sk != NULL) {
1907 seq_printf(seq, " %d %d %lu\n",
1908 sk_wmem_alloc_get(ax25->sk),
1909 sk_rmem_alloc_get(ax25->sk),
1910 sock_i_ino(ax25->sk));
1911 } else {
1912 seq_puts(seq, " * * *\n");
1913 }
1914 return 0;
1915 }
1916
1917 static const struct seq_operations ax25_info_seqops = {
1918 .start = ax25_info_start,
1919 .next = ax25_info_next,
1920 .stop = ax25_info_stop,
1921 .show = ax25_info_show,
1922 };
1923
1924 static int ax25_info_open(struct inode *inode, struct file *file)
1925 {
1926 return seq_open(file, &ax25_info_seqops);
1927 }
1928
1929 static const struct file_operations ax25_info_fops = {
1930 .owner = THIS_MODULE,
1931 .open = ax25_info_open,
1932 .read = seq_read,
1933 .llseek = seq_lseek,
1934 .release = seq_release,
1935 };
1936
1937 #endif
1938
1939 static const struct net_proto_family ax25_family_ops = {
1940 .family = PF_AX25,
1941 .create = ax25_create,
1942 .owner = THIS_MODULE,
1943 };
1944
1945 static const struct proto_ops ax25_proto_ops = {
1946 .family = PF_AX25,
1947 .owner = THIS_MODULE,
1948 .release = ax25_release,
1949 .bind = ax25_bind,
1950 .connect = ax25_connect,
1951 .socketpair = sock_no_socketpair,
1952 .accept = ax25_accept,
1953 .getname = ax25_getname,
1954 .poll = datagram_poll,
1955 .ioctl = ax25_ioctl,
1956 .listen = ax25_listen,
1957 .shutdown = ax25_shutdown,
1958 .setsockopt = ax25_setsockopt,
1959 .getsockopt = ax25_getsockopt,
1960 .sendmsg = ax25_sendmsg,
1961 .recvmsg = ax25_recvmsg,
1962 .mmap = sock_no_mmap,
1963 .sendpage = sock_no_sendpage,
1964 };
1965
1966 /*
1967 * Called by socket.c on kernel start up
1968 */
1969 static struct packet_type ax25_packet_type __read_mostly = {
1970 .type = cpu_to_be16(ETH_P_AX25),
1971 .func = ax25_kiss_rcv,
1972 };
1973
1974 static struct notifier_block ax25_dev_notifier = {
1975 .notifier_call = ax25_device_event,
1976 };
1977
1978 static int __init ax25_init(void)
1979 {
1980 int rc = proto_register(&ax25_proto, 0);
1981
1982 if (rc != 0)
1983 goto out;
1984
1985 sock_register(&ax25_family_ops);
1986 dev_add_pack(&ax25_packet_type);
1987 register_netdevice_notifier(&ax25_dev_notifier);
1988
1989 proc_create("ax25_route", S_IRUGO, init_net.proc_net,
1990 &ax25_route_fops);
1991 proc_create("ax25", S_IRUGO, init_net.proc_net, &ax25_info_fops);
1992 proc_create("ax25_calls", S_IRUGO, init_net.proc_net, &ax25_uid_fops);
1993 out:
1994 return rc;
1995 }
1996 module_init(ax25_init);
1997
1998
1999 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
2000 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
2001 MODULE_LICENSE("GPL");
2002 MODULE_ALIAS_NETPROTO(PF_AX25);
2003
2004 static void __exit ax25_exit(void)
2005 {
2006 remove_proc_entry("ax25_route", init_net.proc_net);
2007 remove_proc_entry("ax25", init_net.proc_net);
2008 remove_proc_entry("ax25_calls", init_net.proc_net);
2009
2010 unregister_netdevice_notifier(&ax25_dev_notifier);
2011
2012 dev_remove_pack(&ax25_packet_type);
2013
2014 sock_unregister(PF_AX25);
2015 proto_unregister(&ax25_proto);
2016
2017 ax25_rt_free();
2018 ax25_uid_free();
2019 ax25_dev_free();
2020 }
2021 module_exit(ax25_exit);
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