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Merge branch 'topic/misc' into for-linus
[firewire-audio.git] / net / ax25 / af_ax25.c
blob5588ba69c468ea4530c74fa2500afc7fd17c72e5
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 <net/ax25.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/skbuff.h>
33 #include <net/sock.h>
34 #include <asm/uaccess.h>
35 #include <asm/system.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/netfilter.h>
44 #include <linux/sysctl.h>
45 #include <linux/init.h>
46 #include <linux/spinlock.h>
47 #include <net/net_namespace.h>
48 #include <net/tcp_states.h>
49 #include <net/ip.h>
50 #include <net/arp.h>
51
52
53
54 HLIST_HEAD(ax25_list);
55 DEFINE_SPINLOCK(ax25_list_lock);
56
57 static const struct proto_ops ax25_proto_ops;
58
59 static void ax25_free_sock(struct sock *sk)
60 {
61 ax25_cb_put(ax25_sk(sk));
62 }
63
64 /*
65 * Socket removal during an interrupt is now safe.
66 */
67 static void ax25_cb_del(ax25_cb *ax25)
68 {
69 if (!hlist_unhashed(&ax25->ax25_node)) {
70 spin_lock_bh(&ax25_list_lock);
71 hlist_del_init(&ax25->ax25_node);
72 spin_unlock_bh(&ax25_list_lock);
73 ax25_cb_put(ax25);
74 }
75 }
76
77 /*
78 * Kill all bound sockets on a dropped device.
79 */
80 static void ax25_kill_by_device(struct net_device *dev)
81 {
82 ax25_dev *ax25_dev;
83 ax25_cb *s;
84 struct hlist_node *node;
85
86 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
87 return;
88
89 spin_lock_bh(&ax25_list_lock);
90 again:
91 ax25_for_each(s, node, &ax25_list) {
92 if (s->ax25_dev == ax25_dev) {
93 s->ax25_dev = NULL;
94 spin_unlock_bh(&ax25_list_lock);
95 ax25_disconnect(s, ENETUNREACH);
96 spin_lock_bh(&ax25_list_lock);
97
98 /* The entry could have been deleted from the
99 * list meanwhile and thus the next pointer is
100 * no longer valid. Play it safe and restart
101 * the scan. Forward progress is ensured
102 * because we set s->ax25_dev to NULL and we
103 * are never passed a NULL 'dev' argument.
104 */
105 goto again;
106 }
107 }
108 spin_unlock_bh(&ax25_list_lock);
109 }
110
111 /*
112 * Handle device status changes.
113 */
114 static int ax25_device_event(struct notifier_block *this, unsigned long event,
115 void *ptr)
116 {
117 struct net_device *dev = (struct net_device *)ptr;
118
119 if (!net_eq(dev_net(dev), &init_net))
120 return NOTIFY_DONE;
121
122 /* Reject non AX.25 devices */
123 if (dev->type != ARPHRD_AX25)
124 return NOTIFY_DONE;
125
126 switch (event) {
127 case NETDEV_UP:
128 ax25_dev_device_up(dev);
129 break;
130 case NETDEV_DOWN:
131 ax25_kill_by_device(dev);
132 ax25_rt_device_down(dev);
133 ax25_dev_device_down(dev);
134 break;
135 default:
136 break;
137 }
138
139 return NOTIFY_DONE;
140 }
141
142 /*
143 * Add a socket to the bound sockets list.
144 */
145 void ax25_cb_add(ax25_cb *ax25)
146 {
147 spin_lock_bh(&ax25_list_lock);
148 ax25_cb_hold(ax25);
149 hlist_add_head(&ax25->ax25_node, &ax25_list);
150 spin_unlock_bh(&ax25_list_lock);
151 }
152
153 /*
154 * Find a socket that wants to accept the SABM we have just
155 * received.
156 */
157 struct sock *ax25_find_listener(ax25_address *addr, int digi,
158 struct net_device *dev, int type)
159 {
160 ax25_cb *s;
161 struct hlist_node *node;
162
163 spin_lock(&ax25_list_lock);
164 ax25_for_each(s, node, &ax25_list) {
165 if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
166 continue;
167 if (s->sk && !ax25cmp(&s->source_addr, addr) &&
168 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
169 /* If device is null we match any device */
170 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
171 sock_hold(s->sk);
172 spin_unlock(&ax25_list_lock);
173 return s->sk;
174 }
175 }
176 }
177 spin_unlock(&ax25_list_lock);
178
179 return NULL;
180 }
181
182 /*
183 * Find an AX.25 socket given both ends.
184 */
185 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
186 int type)
187 {
188 struct sock *sk = NULL;
189 ax25_cb *s;
190 struct hlist_node *node;
191
192 spin_lock(&ax25_list_lock);
193 ax25_for_each(s, node, &ax25_list) {
194 if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
195 !ax25cmp(&s->dest_addr, dest_addr) &&
196 s->sk->sk_type == type) {
197 sk = s->sk;
198 sock_hold(sk);
199 break;
200 }
201 }
202
203 spin_unlock(&ax25_list_lock);
204
205 return sk;
206 }
207
208 /*
209 * Find an AX.25 control block given both ends. It will only pick up
210 * floating AX.25 control blocks or non Raw socket bound control blocks.
211 */
212 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
213 ax25_digi *digi, struct net_device *dev)
214 {
215 ax25_cb *s;
216 struct hlist_node *node;
217
218 spin_lock_bh(&ax25_list_lock);
219 ax25_for_each(s, node, &ax25_list) {
220 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
221 continue;
222 if (s->ax25_dev == NULL)
223 continue;
224 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
225 if (digi != NULL && digi->ndigi != 0) {
226 if (s->digipeat == NULL)
227 continue;
228 if (ax25digicmp(s->digipeat, digi) != 0)
229 continue;
230 } else {
231 if (s->digipeat != NULL && s->digipeat->ndigi != 0)
232 continue;
233 }
234 ax25_cb_hold(s);
235 spin_unlock_bh(&ax25_list_lock);
236
237 return s;
238 }
239 }
240 spin_unlock_bh(&ax25_list_lock);
241
242 return NULL;
243 }
244
245 EXPORT_SYMBOL(ax25_find_cb);
246
247 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
248 {
249 ax25_cb *s;
250 struct sk_buff *copy;
251 struct hlist_node *node;
252
253 spin_lock(&ax25_list_lock);
254 ax25_for_each(s, node, &ax25_list) {
255 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
256 s->sk->sk_type == SOCK_RAW &&
257 s->sk->sk_protocol == proto &&
258 s->ax25_dev->dev == skb->dev &&
259 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
260 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
261 continue;
262 if (sock_queue_rcv_skb(s->sk, copy) != 0)
263 kfree_skb(copy);
264 }
265 }
266 spin_unlock(&ax25_list_lock);
267 }
268
269 /*
270 * Deferred destroy.
271 */
272 void ax25_destroy_socket(ax25_cb *);
273
274 /*
275 * Handler for deferred kills.
276 */
277 static void ax25_destroy_timer(unsigned long data)
278 {
279 ax25_cb *ax25=(ax25_cb *)data;
280 struct sock *sk;
281
282 sk=ax25->sk;
283
284 bh_lock_sock(sk);
285 sock_hold(sk);
286 ax25_destroy_socket(ax25);
287 bh_unlock_sock(sk);
288 sock_put(sk);
289 }
290
291 /*
292 * This is called from user mode and the timers. Thus it protects itself
293 * against interrupt users but doesn't worry about being called during
294 * work. Once it is removed from the queue no interrupt or bottom half
295 * will touch it and we are (fairly 8-) ) safe.
296 */
297 void ax25_destroy_socket(ax25_cb *ax25)
298 {
299 struct sk_buff *skb;
300
301 ax25_cb_del(ax25);
302
303 ax25_stop_heartbeat(ax25);
304 ax25_stop_t1timer(ax25);
305 ax25_stop_t2timer(ax25);
306 ax25_stop_t3timer(ax25);
307 ax25_stop_idletimer(ax25);
308
309 ax25_clear_queues(ax25); /* Flush the queues */
310
311 if (ax25->sk != NULL) {
312 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
313 if (skb->sk != ax25->sk) {
314 /* A pending connection */
315 ax25_cb *sax25 = ax25_sk(skb->sk);
316
317 /* Queue the unaccepted socket for death */
318 sock_orphan(skb->sk);
319
320 /* 9A4GL: hack to release unaccepted sockets */
321 skb->sk->sk_state = TCP_LISTEN;
322
323 ax25_start_heartbeat(sax25);
324 sax25->state = AX25_STATE_0;
325 }
326
327 kfree_skb(skb);
328 }
329 skb_queue_purge(&ax25->sk->sk_write_queue);
330 }
331
332 if (ax25->sk != NULL) {
333 if (sk_has_allocations(ax25->sk)) {
334 /* Defer: outstanding buffers */
335 setup_timer(&ax25->dtimer, ax25_destroy_timer,
336 (unsigned long)ax25);
337 ax25->dtimer.expires = jiffies + 2 * HZ;
338 add_timer(&ax25->dtimer);
339 } else {
340 struct sock *sk=ax25->sk;
341 ax25->sk=NULL;
342 sock_put(sk);
343 }
344 } else {
345 ax25_cb_put(ax25);
346 }
347 }
348
349 /*
350 * dl1bke 960311: set parameters for existing AX.25 connections,
351 * includes a KILL command to abort any connection.
352 * VERY useful for debugging ;-)
353 */
354 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
355 {
356 struct ax25_ctl_struct ax25_ctl;
357 ax25_digi digi;
358 ax25_dev *ax25_dev;
359 ax25_cb *ax25;
360 unsigned int k;
361 int ret = 0;
362
363 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
364 return -EFAULT;
365
366 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
367 return -ENODEV;
368
369 if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
370 return -EINVAL;
371
372 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
373 return -EINVAL;
374
375 digi.ndigi = ax25_ctl.digi_count;
376 for (k = 0; k < digi.ndigi; k++)
377 digi.calls[k] = ax25_ctl.digi_addr[k];
378
379 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
380 return -ENOTCONN;
381
382 switch (ax25_ctl.cmd) {
383 case AX25_KILL:
384 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
385 #ifdef CONFIG_AX25_DAMA_SLAVE
386 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
387 ax25_dama_off(ax25);
388 #endif
389 ax25_disconnect(ax25, ENETRESET);
390 break;
391
392 case AX25_WINDOW:
393 if (ax25->modulus == AX25_MODULUS) {
394 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
395 goto einval_put;
396 } else {
397 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
398 goto einval_put;
399 }
400 ax25->window = ax25_ctl.arg;
401 break;
402
403 case AX25_T1:
404 if (ax25_ctl.arg < 1)
405 goto einval_put;
406 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
407 ax25->t1 = ax25_ctl.arg * HZ;
408 break;
409
410 case AX25_T2:
411 if (ax25_ctl.arg < 1)
412 goto einval_put;
413 ax25->t2 = ax25_ctl.arg * HZ;
414 break;
415
416 case AX25_N2:
417 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
418 goto einval_put;
419 ax25->n2count = 0;
420 ax25->n2 = ax25_ctl.arg;
421 break;
422
423 case AX25_T3:
424 ax25->t3 = ax25_ctl.arg * HZ;
425 break;
426
427 case AX25_IDLE:
428 ax25->idle = ax25_ctl.arg * 60 * HZ;
429 break;
430
431 case AX25_PACLEN:
432 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
433 goto einval_put;
434 ax25->paclen = ax25_ctl.arg;
435 break;
436
437 default:
438 goto einval_put;
439 }
440
441 out_put:
442 ax25_cb_put(ax25);
443 return ret;
444
445 einval_put:
446 ret = -EINVAL;
447 goto out_put;
448 }
449
450 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
451 {
452 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
453 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
454 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
455 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
456 ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
457 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
458 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
459 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
460
461 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
462 ax25->modulus = AX25_EMODULUS;
463 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
464 } else {
465 ax25->modulus = AX25_MODULUS;
466 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
467 }
468 }
469
470 /*
471 * Fill in a created AX.25 created control block with the default
472 * values for a particular device.
473 */
474 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
475 {
476 ax25->ax25_dev = ax25_dev;
477
478 if (ax25->ax25_dev != NULL) {
479 ax25_fillin_cb_from_dev(ax25, ax25_dev);
480 return;
481 }
482
483 /*
484 * No device, use kernel / AX.25 spec default values
485 */
486 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2;
487 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1);
488 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2);
489 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3);
490 ax25->n2 = AX25_DEF_N2;
491 ax25->paclen = AX25_DEF_PACLEN;
492 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE);
493 ax25->backoff = AX25_DEF_BACKOFF;
494
495 if (AX25_DEF_AXDEFMODE) {
496 ax25->modulus = AX25_EMODULUS;
497 ax25->window = AX25_DEF_EWINDOW;
498 } else {
499 ax25->modulus = AX25_MODULUS;
500 ax25->window = AX25_DEF_WINDOW;
501 }
502 }
503
504 /*
505 * Create an empty AX.25 control block.
506 */
507 ax25_cb *ax25_create_cb(void)
508 {
509 ax25_cb *ax25;
510
511 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
512 return NULL;
513
514 atomic_set(&ax25->refcount, 1);
515
516 skb_queue_head_init(&ax25->write_queue);
517 skb_queue_head_init(&ax25->frag_queue);
518 skb_queue_head_init(&ax25->ack_queue);
519 skb_queue_head_init(&ax25->reseq_queue);
520
521 ax25_setup_timers(ax25);
522
523 ax25_fillin_cb(ax25, NULL);
524
525 ax25->state = AX25_STATE_0;
526
527 return ax25;
528 }
529
530 /*
531 * Handling for system calls applied via the various interfaces to an
532 * AX25 socket object
533 */
534
535 static int ax25_setsockopt(struct socket *sock, int level, int optname,
536 char __user *optval, unsigned int optlen)
537 {
538 struct sock *sk = sock->sk;
539 ax25_cb *ax25;
540 struct net_device *dev;
541 char devname[IFNAMSIZ];
542 int opt, res = 0;
543
544 if (level != SOL_AX25)
545 return -ENOPROTOOPT;
546
547 if (optlen < sizeof(int))
548 return -EINVAL;
549
550 if (get_user(opt, (int __user *)optval))
551 return -EFAULT;
552
553 lock_sock(sk);
554 ax25 = ax25_sk(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) {
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) {
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) {
599 res = -EINVAL;
600 break;
601 }
602 ax25->t3 = opt * HZ;
603 break;
604
605 case AX25_IDLE:
606 if (opt < 0) {
607 res = -EINVAL;
608 break;
609 }
610 ax25->idle = opt * 60 * HZ;
611 break;
612
613 case AX25_BACKOFF:
614 if (opt < 0 || 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 = ax25_sk(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 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 #endif
840 #ifdef CONFIG_ROSE_MODULE
841 case AX25_P_ROSE:
842 if (ax25_protocol_is_registered(AX25_P_ROSE))
843 return -ESOCKTNOSUPPORT;
844 #endif
845 default:
846 break;
847 }
848 break;
849
850 case SOCK_RAW:
851 break;
852 default:
853 return -ESOCKTNOSUPPORT;
854 }
855
856 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto);
857 if (sk == NULL)
858 return -ENOMEM;
859
860 ax25 = sk->sk_protinfo = ax25_create_cb();
861 if (!ax25) {
862 sk_free(sk);
863 return -ENOMEM;
864 }
865
866 sock_init_data(sock, sk);
867
868 sk->sk_destruct = ax25_free_sock;
869 sock->ops = &ax25_proto_ops;
870 sk->sk_protocol = protocol;
871
872 ax25->sk = sk;
873
874 return 0;
875 }
876
877 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
878 {
879 struct sock *sk;
880 ax25_cb *ax25, *oax25;
881
882 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot);
883 if (sk == NULL)
884 return NULL;
885
886 if ((ax25 = ax25_create_cb()) == NULL) {
887 sk_free(sk);
888 return NULL;
889 }
890
891 switch (osk->sk_type) {
892 case SOCK_DGRAM:
893 break;
894 case SOCK_SEQPACKET:
895 break;
896 default:
897 sk_free(sk);
898 ax25_cb_put(ax25);
899 return NULL;
900 }
901
902 sock_init_data(NULL, sk);
903
904 sk->sk_type = osk->sk_type;
905 sk->sk_priority = osk->sk_priority;
906 sk->sk_protocol = osk->sk_protocol;
907 sk->sk_rcvbuf = osk->sk_rcvbuf;
908 sk->sk_sndbuf = osk->sk_sndbuf;
909 sk->sk_state = TCP_ESTABLISHED;
910 sock_copy_flags(sk, osk);
911
912 oax25 = ax25_sk(osk);
913
914 ax25->modulus = oax25->modulus;
915 ax25->backoff = oax25->backoff;
916 ax25->pidincl = oax25->pidincl;
917 ax25->iamdigi = oax25->iamdigi;
918 ax25->rtt = oax25->rtt;
919 ax25->t1 = oax25->t1;
920 ax25->t2 = oax25->t2;
921 ax25->t3 = oax25->t3;
922 ax25->n2 = oax25->n2;
923 ax25->idle = oax25->idle;
924 ax25->paclen = oax25->paclen;
925 ax25->window = oax25->window;
926
927 ax25->ax25_dev = ax25_dev;
928 ax25->source_addr = oax25->source_addr;
929
930 if (oax25->digipeat != NULL) {
931 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
932 GFP_ATOMIC);
933 if (ax25->digipeat == NULL) {
934 sk_free(sk);
935 ax25_cb_put(ax25);
936 return NULL;
937 }
938 }
939
940 sk->sk_protinfo = ax25;
941 sk->sk_destruct = ax25_free_sock;
942 ax25->sk = sk;
943
944 return sk;
945 }
946
947 static int ax25_release(struct socket *sock)
948 {
949 struct sock *sk = sock->sk;
950 ax25_cb *ax25;
951
952 if (sk == NULL)
953 return 0;
954
955 sock_hold(sk);
956 sock_orphan(sk);
957 lock_sock(sk);
958 ax25 = ax25_sk(sk);
959
960 if (sk->sk_type == SOCK_SEQPACKET) {
961 switch (ax25->state) {
962 case AX25_STATE_0:
963 release_sock(sk);
964 ax25_disconnect(ax25, 0);
965 lock_sock(sk);
966 ax25_destroy_socket(ax25);
967 break;
968
969 case AX25_STATE_1:
970 case AX25_STATE_2:
971 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
972 release_sock(sk);
973 ax25_disconnect(ax25, 0);
974 lock_sock(sk);
975 ax25_destroy_socket(ax25);
976 break;
977
978 case AX25_STATE_3:
979 case AX25_STATE_4:
980 ax25_clear_queues(ax25);
981 ax25->n2count = 0;
982
983 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
984 case AX25_PROTO_STD_SIMPLEX:
985 case AX25_PROTO_STD_DUPLEX:
986 ax25_send_control(ax25,
987 AX25_DISC,
988 AX25_POLLON,
989 AX25_COMMAND);
990 ax25_stop_t2timer(ax25);
991 ax25_stop_t3timer(ax25);
992 ax25_stop_idletimer(ax25);
993 break;
994 #ifdef CONFIG_AX25_DAMA_SLAVE
995 case AX25_PROTO_DAMA_SLAVE:
996 ax25_stop_t3timer(ax25);
997 ax25_stop_idletimer(ax25);
998 break;
999 #endif
1000 }
1001 ax25_calculate_t1(ax25);
1002 ax25_start_t1timer(ax25);
1003 ax25->state = AX25_STATE_2;
1004 sk->sk_state = TCP_CLOSE;
1005 sk->sk_shutdown |= SEND_SHUTDOWN;
1006 sk->sk_state_change(sk);
1007 sock_set_flag(sk, SOCK_DESTROY);
1008 break;
1009
1010 default:
1011 break;
1012 }
1013 } else {
1014 sk->sk_state = TCP_CLOSE;
1015 sk->sk_shutdown |= SEND_SHUTDOWN;
1016 sk->sk_state_change(sk);
1017 ax25_destroy_socket(ax25);
1018 }
1019
1020 sock->sk = NULL;
1021 release_sock(sk);
1022 sock_put(sk);
1023
1024 return 0;
1025 }
1026
1027 /*
1028 * We support a funny extension here so you can (as root) give any callsign
1029 * digipeated via a local address as source. This hack is obsolete now
1030 * that we've implemented support for SO_BINDTODEVICE. It is however small
1031 * and trivially backward compatible.
1032 */
1033 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1034 {
1035 struct sock *sk = sock->sk;
1036 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1037 ax25_dev *ax25_dev = NULL;
1038 ax25_uid_assoc *user;
1039 ax25_address call;
1040 ax25_cb *ax25;
1041 int err = 0;
1042
1043 if (addr_len != sizeof(struct sockaddr_ax25) &&
1044 addr_len != sizeof(struct full_sockaddr_ax25))
1045 /* support for old structure may go away some time
1046 * ax25_bind(): uses old (6 digipeater) socket structure.
1047 */
1048 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1049 (addr_len > sizeof(struct full_sockaddr_ax25)))
1050 return -EINVAL;
1051
1052 if (addr->fsa_ax25.sax25_family != AF_AX25)
1053 return -EINVAL;
1054
1055 user = ax25_findbyuid(current_euid());
1056 if (user) {
1057 call = user->call;
1058 ax25_uid_put(user);
1059 } else {
1060 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1061 return -EACCES;
1062
1063 call = addr->fsa_ax25.sax25_call;
1064 }
1065
1066 lock_sock(sk);
1067
1068 ax25 = ax25_sk(sk);
1069 if (!sock_flag(sk, SOCK_ZAPPED)) {
1070 err = -EINVAL;
1071 goto out;
1072 }
1073
1074 ax25->source_addr = call;
1075
1076 /*
1077 * User already set interface with SO_BINDTODEVICE
1078 */
1079 if (ax25->ax25_dev != NULL)
1080 goto done;
1081
1082 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1083 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1084 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1085 err = -EADDRNOTAVAIL;
1086 goto out;
1087 }
1088 } else {
1089 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1090 err = -EADDRNOTAVAIL;
1091 goto out;
1092 }
1093 }
1094
1095 if (ax25_dev != NULL)
1096 ax25_fillin_cb(ax25, ax25_dev);
1097
1098 done:
1099 ax25_cb_add(ax25);
1100 sock_reset_flag(sk, SOCK_ZAPPED);
1101
1102 out:
1103 release_sock(sk);
1104
1105 return 0;
1106 }
1107
1108 /*
1109 * FIXME: nonblock behaviour looks like it may have a bug.
1110 */
1111 static int __must_check ax25_connect(struct socket *sock,
1112 struct sockaddr *uaddr, int addr_len, int flags)
1113 {
1114 struct sock *sk = sock->sk;
1115 ax25_cb *ax25 = ax25_sk(sk), *ax25t;
1116 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1117 ax25_digi *digi = NULL;
1118 int ct = 0, err = 0;
1119
1120 /*
1121 * some sanity checks. code further down depends on this
1122 */
1123
1124 if (addr_len == sizeof(struct sockaddr_ax25))
1125 /* support for this will go away in early 2.5.x
1126 * ax25_connect(): uses obsolete socket structure
1127 */
1128 ;
1129 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1130 /* support for old structure may go away some time
1131 * ax25_connect(): uses old (6 digipeater) socket structure.
1132 */
1133 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1134 (addr_len > sizeof(struct full_sockaddr_ax25)))
1135 return -EINVAL;
1136
1137
1138 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1139 return -EINVAL;
1140
1141 lock_sock(sk);
1142
1143 /* deal with restarts */
1144 if (sock->state == SS_CONNECTING) {
1145 switch (sk->sk_state) {
1146 case TCP_SYN_SENT: /* still trying */
1147 err = -EINPROGRESS;
1148 goto out_release;
1149
1150 case TCP_ESTABLISHED: /* connection established */
1151 sock->state = SS_CONNECTED;
1152 goto out_release;
1153
1154 case TCP_CLOSE: /* connection refused */
1155 sock->state = SS_UNCONNECTED;
1156 err = -ECONNREFUSED;
1157 goto out_release;
1158 }
1159 }
1160
1161 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1162 err = -EISCONN; /* No reconnect on a seqpacket socket */
1163 goto out_release;
1164 }
1165
1166 sk->sk_state = TCP_CLOSE;
1167 sock->state = SS_UNCONNECTED;
1168
1169 kfree(ax25->digipeat);
1170 ax25->digipeat = NULL;
1171
1172 /*
1173 * Handle digi-peaters to be used.
1174 */
1175 if (addr_len > sizeof(struct sockaddr_ax25) &&
1176 fsa->fsa_ax25.sax25_ndigis != 0) {
1177 /* Valid number of digipeaters ? */
1178 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1179 err = -EINVAL;
1180 goto out_release;
1181 }
1182
1183 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1184 err = -ENOBUFS;
1185 goto out_release;
1186 }
1187
1188 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1189 digi->lastrepeat = -1;
1190
1191 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1192 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1193 AX25_HBIT) && ax25->iamdigi) {
1194 digi->repeated[ct] = 1;
1195 digi->lastrepeat = ct;
1196 } else {
1197 digi->repeated[ct] = 0;
1198 }
1199 digi->calls[ct] = fsa->fsa_digipeater[ct];
1200 ct++;
1201 }
1202 }
1203
1204 /*
1205 * Must bind first - autobinding in this may or may not work. If
1206 * the socket is already bound, check to see if the device has
1207 * been filled in, error if it hasn't.
1208 */
1209 if (sock_flag(sk, SOCK_ZAPPED)) {
1210 /* check if we can remove this feature. It is broken. */
1211 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1212 current->comm);
1213 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1214 kfree(digi);
1215 goto out_release;
1216 }
1217
1218 ax25_fillin_cb(ax25, ax25->ax25_dev);
1219 ax25_cb_add(ax25);
1220 } else {
1221 if (ax25->ax25_dev == NULL) {
1222 kfree(digi);
1223 err = -EHOSTUNREACH;
1224 goto out_release;
1225 }
1226 }
1227
1228 if (sk->sk_type == SOCK_SEQPACKET &&
1229 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1230 ax25->ax25_dev->dev))) {
1231 kfree(digi);
1232 err = -EADDRINUSE; /* Already such a connection */
1233 ax25_cb_put(ax25t);
1234 goto out_release;
1235 }
1236
1237 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1238 ax25->digipeat = digi;
1239
1240 /* First the easy one */
1241 if (sk->sk_type != SOCK_SEQPACKET) {
1242 sock->state = SS_CONNECTED;
1243 sk->sk_state = TCP_ESTABLISHED;
1244 goto out_release;
1245 }
1246
1247 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1248 sock->state = SS_CONNECTING;
1249 sk->sk_state = TCP_SYN_SENT;
1250
1251 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1252 case AX25_PROTO_STD_SIMPLEX:
1253 case AX25_PROTO_STD_DUPLEX:
1254 ax25_std_establish_data_link(ax25);
1255 break;
1256
1257 #ifdef CONFIG_AX25_DAMA_SLAVE
1258 case AX25_PROTO_DAMA_SLAVE:
1259 ax25->modulus = AX25_MODULUS;
1260 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1261 if (ax25->ax25_dev->dama.slave)
1262 ax25_ds_establish_data_link(ax25);
1263 else
1264 ax25_std_establish_data_link(ax25);
1265 break;
1266 #endif
1267 }
1268
1269 ax25->state = AX25_STATE_1;
1270
1271 ax25_start_heartbeat(ax25);
1272
1273 /* Now the loop */
1274 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1275 err = -EINPROGRESS;
1276 goto out_release;
1277 }
1278
1279 if (sk->sk_state == TCP_SYN_SENT) {
1280 DEFINE_WAIT(wait);
1281
1282 for (;;) {
1283 prepare_to_wait(sk->sk_sleep, &wait,
1284 TASK_INTERRUPTIBLE);
1285 if (sk->sk_state != TCP_SYN_SENT)
1286 break;
1287 if (!signal_pending(current)) {
1288 release_sock(sk);
1289 schedule();
1290 lock_sock(sk);
1291 continue;
1292 }
1293 err = -ERESTARTSYS;
1294 break;
1295 }
1296 finish_wait(sk->sk_sleep, &wait);
1297
1298 if (err)
1299 goto out_release;
1300 }
1301
1302 if (sk->sk_state != TCP_ESTABLISHED) {
1303 /* Not in ABM, not in WAIT_UA -> failed */
1304 sock->state = SS_UNCONNECTED;
1305 err = sock_error(sk); /* Always set at this point */
1306 goto out_release;
1307 }
1308
1309 sock->state = SS_CONNECTED;
1310
1311 err = 0;
1312 out_release:
1313 release_sock(sk);
1314
1315 return err;
1316 }
1317
1318 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
1319 {
1320 struct sk_buff *skb;
1321 struct sock *newsk;
1322 DEFINE_WAIT(wait);
1323 struct sock *sk;
1324 int err = 0;
1325
1326 if (sock->state != SS_UNCONNECTED)
1327 return -EINVAL;
1328
1329 if ((sk = sock->sk) == NULL)
1330 return -EINVAL;
1331
1332 lock_sock(sk);
1333 if (sk->sk_type != SOCK_SEQPACKET) {
1334 err = -EOPNOTSUPP;
1335 goto out;
1336 }
1337
1338 if (sk->sk_state != TCP_LISTEN) {
1339 err = -EINVAL;
1340 goto out;
1341 }
1342
1343 /*
1344 * The read queue this time is holding sockets ready to use
1345 * hooked into the SABM we saved
1346 */
1347 for (;;) {
1348 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1349 skb = skb_dequeue(&sk->sk_receive_queue);
1350 if (skb)
1351 break;
1352
1353 if (flags & O_NONBLOCK) {
1354 err = -EWOULDBLOCK;
1355 break;
1356 }
1357 if (!signal_pending(current)) {
1358 release_sock(sk);
1359 schedule();
1360 lock_sock(sk);
1361 continue;
1362 }
1363 err = -ERESTARTSYS;
1364 break;
1365 }
1366 finish_wait(sk->sk_sleep, &wait);
1367
1368 if (err)
1369 goto out;
1370
1371 newsk = skb->sk;
1372 sock_graft(newsk, newsock);
1373
1374 /* Now attach up the new socket */
1375 kfree_skb(skb);
1376 sk->sk_ack_backlog--;
1377 newsock->state = SS_CONNECTED;
1378
1379 out:
1380 release_sock(sk);
1381
1382 return err;
1383 }
1384
1385 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1386 int *uaddr_len, int peer)
1387 {
1388 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1389 struct sock *sk = sock->sk;
1390 unsigned char ndigi, i;
1391 ax25_cb *ax25;
1392 int err = 0;
1393
1394 lock_sock(sk);
1395 ax25 = ax25_sk(sk);
1396
1397 if (peer != 0) {
1398 if (sk->sk_state != TCP_ESTABLISHED) {
1399 err = -ENOTCONN;
1400 goto out;
1401 }
1402
1403 fsa->fsa_ax25.sax25_family = AF_AX25;
1404 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1405 fsa->fsa_ax25.sax25_ndigis = 0;
1406
1407 if (ax25->digipeat != NULL) {
1408 ndigi = ax25->digipeat->ndigi;
1409 fsa->fsa_ax25.sax25_ndigis = ndigi;
1410 for (i = 0; i < ndigi; i++)
1411 fsa->fsa_digipeater[i] =
1412 ax25->digipeat->calls[i];
1413 }
1414 } else {
1415 fsa->fsa_ax25.sax25_family = AF_AX25;
1416 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1417 fsa->fsa_ax25.sax25_ndigis = 1;
1418 if (ax25->ax25_dev != NULL) {
1419 memcpy(&fsa->fsa_digipeater[0],
1420 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1421 } else {
1422 fsa->fsa_digipeater[0] = null_ax25_address;
1423 }
1424 }
1425 *uaddr_len = sizeof (struct full_sockaddr_ax25);
1426
1427 out:
1428 release_sock(sk);
1429
1430 return err;
1431 }
1432
1433 static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
1434 struct msghdr *msg, size_t len)
1435 {
1436 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)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 = ax25_sk(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 SOCK_DEBUG(sk, "AX.25: sendto: Addresses built. Building packet.\n");
1541
1542 /* Assume the worst case */
1543 size = len + ax25->ax25_dev->dev->hard_header_len;
1544
1545 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1546 if (skb == NULL)
1547 goto out;
1548
1549 skb_reserve(skb, size - len);
1550
1551 SOCK_DEBUG(sk, "AX.25: Appending user data\n");
1552
1553 /* User data follows immediately after the AX.25 data */
1554 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, 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 SOCK_DEBUG(sk, "AX.25: Transmitting buffer\n");
1567
1568 if (sk->sk_type == SOCK_SEQPACKET) {
1569 /* Connected mode sockets go via the LAPB machine */
1570 if (sk->sk_state != TCP_ESTABLISHED) {
1571 kfree_skb(skb);
1572 err = -ENOTCONN;
1573 goto out;
1574 }
1575
1576 /* Shove it onto the queue and kick */
1577 ax25_output(ax25, ax25->paclen, skb);
1578
1579 err = len;
1580 goto out;
1581 }
1582
1583 skb_push(skb, 1 + ax25_addr_size(dp));
1584
1585 SOCK_DEBUG(sk, "Building AX.25 Header (dp=%p).\n", dp);
1586
1587 if (dp != NULL)
1588 SOCK_DEBUG(sk, "Num digipeaters=%d\n", dp->ndigi);
1589
1590 /* Build an AX.25 header */
1591 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1592 dp, AX25_COMMAND, AX25_MODULUS);
1593
1594 SOCK_DEBUG(sk, "Built header (%d bytes)\n",lv);
1595
1596 skb_set_transport_header(skb, lv);
1597
1598 SOCK_DEBUG(sk, "base=%p pos=%p\n",
1599 skb->data, skb_transport_header(skb));
1600
1601 *skb_transport_header(skb) = AX25_UI;
1602
1603 /* Datagram frames go straight out of the door as UI */
1604 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1605
1606 err = len;
1607
1608 out:
1609 release_sock(sk);
1610
1611 return err;
1612 }
1613
1614 static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock,
1615 struct msghdr *msg, size_t size, int flags)
1616 {
1617 struct sock *sk = sock->sk;
1618 struct sk_buff *skb;
1619 int copied;
1620 int err = 0;
1621
1622 lock_sock(sk);
1623 /*
1624 * This works for seqpacket too. The receiver has ordered the
1625 * queue for us! We do one quick check first though
1626 */
1627 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1628 err = -ENOTCONN;
1629 goto out;
1630 }
1631
1632 /* Now we can treat all alike */
1633 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1634 flags & MSG_DONTWAIT, &err);
1635 if (skb == NULL)
1636 goto out;
1637
1638 if (!ax25_sk(sk)->pidincl)
1639 skb_pull(skb, 1); /* Remove PID */
1640
1641 skb_reset_transport_header(skb);
1642 copied = skb->len;
1643
1644 if (copied > size) {
1645 copied = size;
1646 msg->msg_flags |= MSG_TRUNC;
1647 }
1648
1649 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1650
1651 if (msg->msg_namelen != 0) {
1652 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1653 ax25_digi digi;
1654 ax25_address src;
1655 const unsigned char *mac = skb_mac_header(skb);
1656
1657 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1658 &digi, NULL, NULL);
1659 sax->sax25_family = AF_AX25;
1660 /* We set this correctly, even though we may not let the
1661 application know the digi calls further down (because it
1662 did NOT ask to know them). This could get political... **/
1663 sax->sax25_ndigis = digi.ndigi;
1664 sax->sax25_call = src;
1665
1666 if (sax->sax25_ndigis != 0) {
1667 int ct;
1668 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1669
1670 for (ct = 0; ct < digi.ndigi; ct++)
1671 fsa->fsa_digipeater[ct] = digi.calls[ct];
1672 }
1673 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1674 }
1675
1676 skb_free_datagram(sk, skb);
1677 err = copied;
1678
1679 out:
1680 release_sock(sk);
1681
1682 return err;
1683 }
1684
1685 static int ax25_shutdown(struct socket *sk, int how)
1686 {
1687 /* FIXME - generate DM and RNR states */
1688 return -EOPNOTSUPP;
1689 }
1690
1691 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1692 {
1693 struct sock *sk = sock->sk;
1694 void __user *argp = (void __user *)arg;
1695 int res = 0;
1696
1697 lock_sock(sk);
1698 switch (cmd) {
1699 case TIOCOUTQ: {
1700 long amount;
1701
1702 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1703 if (amount < 0)
1704 amount = 0;
1705 res = put_user(amount, (int __user *)argp);
1706 break;
1707 }
1708
1709 case TIOCINQ: {
1710 struct sk_buff *skb;
1711 long amount = 0L;
1712 /* These two are safe on a single CPU system as only user tasks fiddle here */
1713 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1714 amount = skb->len;
1715 res = put_user(amount, (int __user *) argp);
1716 break;
1717 }
1718
1719 case SIOCGSTAMP:
1720 res = sock_get_timestamp(sk, argp);
1721 break;
1722
1723 case SIOCGSTAMPNS:
1724 res = sock_get_timestampns(sk, argp);
1725 break;
1726
1727 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1728 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1729 case SIOCAX25GETUID: {
1730 struct sockaddr_ax25 sax25;
1731 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1732 res = -EFAULT;
1733 break;
1734 }
1735 res = ax25_uid_ioctl(cmd, &sax25);
1736 break;
1737 }
1738
1739 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1740 long amount;
1741 if (!capable(CAP_NET_ADMIN)) {
1742 res = -EPERM;
1743 break;
1744 }
1745 if (get_user(amount, (long __user *)argp)) {
1746 res = -EFAULT;
1747 break;
1748 }
1749 if (amount > AX25_NOUID_BLOCK) {
1750 res = -EINVAL;
1751 break;
1752 }
1753 ax25_uid_policy = amount;
1754 res = 0;
1755 break;
1756 }
1757
1758 case SIOCADDRT:
1759 case SIOCDELRT:
1760 case SIOCAX25OPTRT:
1761 if (!capable(CAP_NET_ADMIN)) {
1762 res = -EPERM;
1763 break;
1764 }
1765 res = ax25_rt_ioctl(cmd, argp);
1766 break;
1767
1768 case SIOCAX25CTLCON:
1769 if (!capable(CAP_NET_ADMIN)) {
1770 res = -EPERM;
1771 break;
1772 }
1773 res = ax25_ctl_ioctl(cmd, argp);
1774 break;
1775
1776 case SIOCAX25GETINFO:
1777 case SIOCAX25GETINFOOLD: {
1778 ax25_cb *ax25 = ax25_sk(sk);
1779 struct ax25_info_struct ax25_info;
1780
1781 ax25_info.t1 = ax25->t1 / HZ;
1782 ax25_info.t2 = ax25->t2 / HZ;
1783 ax25_info.t3 = ax25->t3 / HZ;
1784 ax25_info.idle = ax25->idle / (60 * HZ);
1785 ax25_info.n2 = ax25->n2;
1786 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1787 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1788 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1789 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1790 ax25_info.n2count = ax25->n2count;
1791 ax25_info.state = ax25->state;
1792 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1793 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1794 ax25_info.vs = ax25->vs;
1795 ax25_info.vr = ax25->vr;
1796 ax25_info.va = ax25->va;
1797 ax25_info.vs_max = ax25->vs; /* reserved */
1798 ax25_info.paclen = ax25->paclen;
1799 ax25_info.window = ax25->window;
1800
1801 /* old structure? */
1802 if (cmd == SIOCAX25GETINFOOLD) {
1803 static int warned = 0;
1804 if (!warned) {
1805 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1806 current->comm);
1807 warned=1;
1808 }
1809
1810 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1811 res = -EFAULT;
1812 break;
1813 }
1814 } else {
1815 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1816 res = -EINVAL;
1817 break;
1818 }
1819 }
1820 res = 0;
1821 break;
1822 }
1823
1824 case SIOCAX25ADDFWD:
1825 case SIOCAX25DELFWD: {
1826 struct ax25_fwd_struct ax25_fwd;
1827 if (!capable(CAP_NET_ADMIN)) {
1828 res = -EPERM;
1829 break;
1830 }
1831 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1832 res = -EFAULT;
1833 break;
1834 }
1835 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1836 break;
1837 }
1838
1839 case SIOCGIFADDR:
1840 case SIOCSIFADDR:
1841 case SIOCGIFDSTADDR:
1842 case SIOCSIFDSTADDR:
1843 case SIOCGIFBRDADDR:
1844 case SIOCSIFBRDADDR:
1845 case SIOCGIFNETMASK:
1846 case SIOCSIFNETMASK:
1847 case SIOCGIFMETRIC:
1848 case SIOCSIFMETRIC:
1849 res = -EINVAL;
1850 break;
1851
1852 default:
1853 res = -ENOIOCTLCMD;
1854 break;
1855 }
1856 release_sock(sk);
1857
1858 return res;
1859 }
1860
1861 #ifdef CONFIG_PROC_FS
1862
1863 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1864 __acquires(ax25_list_lock)
1865 {
1866 struct ax25_cb *ax25;
1867 struct hlist_node *node;
1868 int i = 0;
1869
1870 spin_lock_bh(&ax25_list_lock);
1871 ax25_for_each(ax25, node, &ax25_list) {
1872 if (i == *pos)
1873 return ax25;
1874 ++i;
1875 }
1876 return NULL;
1877 }
1878
1879 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1880 {
1881 ++*pos;
1882
1883 return hlist_entry( ((struct ax25_cb *)v)->ax25_node.next,
1884 struct ax25_cb, ax25_node);
1885 }
1886
1887 static void ax25_info_stop(struct seq_file *seq, void *v)
1888 __releases(ax25_list_lock)
1889 {
1890 spin_unlock_bh(&ax25_list_lock);
1891 }
1892
1893 static int ax25_info_show(struct seq_file *seq, void *v)
1894 {
1895 ax25_cb *ax25 = v;
1896 char buf[11];
1897 int k;
1898
1899
1900 /*
1901 * New format:
1902 * 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
1903 */
1904
1905 seq_printf(seq, "%8.8lx %s %s%s ",
1906 (long) ax25,
1907 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1908 ax2asc(buf, &ax25->source_addr),
1909 ax25->iamdigi? "*":"");
1910 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1911
1912 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1913 seq_printf(seq, ",%s%s",
1914 ax2asc(buf, &ax25->digipeat->calls[k]),
1915 ax25->digipeat->repeated[k]? "*":"");
1916 }
1917
1918 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1919 ax25->state,
1920 ax25->vs, ax25->vr, ax25->va,
1921 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1922 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1923 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1924 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1925 ax25->idle / (60 * HZ),
1926 ax25->n2count, ax25->n2,
1927 ax25->rtt / HZ,
1928 ax25->window,
1929 ax25->paclen);
1930
1931 if (ax25->sk != NULL) {
1932 seq_printf(seq, " %d %d %lu\n",
1933 sk_wmem_alloc_get(ax25->sk),
1934 sk_rmem_alloc_get(ax25->sk),
1935 sock_i_ino(ax25->sk));
1936 } else {
1937 seq_puts(seq, " * * *\n");
1938 }
1939 return 0;
1940 }
1941
1942 static const struct seq_operations ax25_info_seqops = {
1943 .start = ax25_info_start,
1944 .next = ax25_info_next,
1945 .stop = ax25_info_stop,
1946 .show = ax25_info_show,
1947 };
1948
1949 static int ax25_info_open(struct inode *inode, struct file *file)
1950 {
1951 return seq_open(file, &ax25_info_seqops);
1952 }
1953
1954 static const struct file_operations ax25_info_fops = {
1955 .owner = THIS_MODULE,
1956 .open = ax25_info_open,
1957 .read = seq_read,
1958 .llseek = seq_lseek,
1959 .release = seq_release,
1960 };
1961
1962 #endif
1963
1964 static const struct net_proto_family ax25_family_ops = {
1965 .family = PF_AX25,
1966 .create = ax25_create,
1967 .owner = THIS_MODULE,
1968 };
1969
1970 static const struct proto_ops ax25_proto_ops = {
1971 .family = PF_AX25,
1972 .owner = THIS_MODULE,
1973 .release = ax25_release,
1974 .bind = ax25_bind,
1975 .connect = ax25_connect,
1976 .socketpair = sock_no_socketpair,
1977 .accept = ax25_accept,
1978 .getname = ax25_getname,
1979 .poll = datagram_poll,
1980 .ioctl = ax25_ioctl,
1981 .listen = ax25_listen,
1982 .shutdown = ax25_shutdown,
1983 .setsockopt = ax25_setsockopt,
1984 .getsockopt = ax25_getsockopt,
1985 .sendmsg = ax25_sendmsg,
1986 .recvmsg = ax25_recvmsg,
1987 .mmap = sock_no_mmap,
1988 .sendpage = sock_no_sendpage,
1989 };
1990
1991 /*
1992 * Called by socket.c on kernel start up
1993 */
1994 static struct packet_type ax25_packet_type __read_mostly = {
1995 .type = cpu_to_be16(ETH_P_AX25),
1996 .func = ax25_kiss_rcv,
1997 };
1998
1999 static struct notifier_block ax25_dev_notifier = {
2000 .notifier_call =ax25_device_event,
2001 };
2002
2003 static int __init ax25_init(void)
2004 {
2005 int rc = proto_register(&ax25_proto, 0);
2006
2007 if (rc != 0)
2008 goto out;
2009
2010 sock_register(&ax25_family_ops);
2011 dev_add_pack(&ax25_packet_type);
2012 register_netdevice_notifier(&ax25_dev_notifier);
2013 ax25_register_sysctl();
2014
2015 proc_net_fops_create(&init_net, "ax25_route", S_IRUGO, &ax25_route_fops);
2016 proc_net_fops_create(&init_net, "ax25", S_IRUGO, &ax25_info_fops);
2017 proc_net_fops_create(&init_net, "ax25_calls", S_IRUGO, &ax25_uid_fops);
2018 out:
2019 return rc;
2020 }
2021 module_init(ax25_init);
2022
2023
2024 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
2025 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
2026 MODULE_LICENSE("GPL");
2027 MODULE_ALIAS_NETPROTO(PF_AX25);
2028
2029 static void __exit ax25_exit(void)
2030 {
2031 proc_net_remove(&init_net, "ax25_route");
2032 proc_net_remove(&init_net, "ax25");
2033 proc_net_remove(&init_net, "ax25_calls");
2034 ax25_rt_free();
2035 ax25_uid_free();
2036 ax25_dev_free();
2037
2038 ax25_unregister_sysctl();
2039 unregister_netdevice_notifier(&ax25_dev_notifier);
2040
2041 dev_remove_pack(&ax25_packet_type);
2042
2043 sock_unregister(PF_AX25);
2044 proto_unregister(&ax25_proto);
2045 }
2046 module_exit(ax25_exit);
AMDTP streaming driver for the Linux FireWire stack (Juju)