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ptrace: kill __ptrace_detach(), fix ->exit_state check
[linux-2.6/mini2440.git] / net / ax25 / af_ax25.c
blob00d9e5e131582669cab51f01b91b43c204ea0da8
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 (atomic_read(&ax25->sk->sk_wmem_alloc) ||
334 atomic_read(&ax25->sk->sk_rmem_alloc)) {
335 /* Defer: outstanding buffers */
336 setup_timer(&ax25->dtimer, ax25_destroy_timer,
337 (unsigned long)ax25);
338 ax25->dtimer.expires = jiffies + 2 * HZ;
339 add_timer(&ax25->dtimer);
340 } else {
341 struct sock *sk=ax25->sk;
342 ax25->sk=NULL;
343 sock_put(sk);
344 }
345 } else {
346 ax25_cb_put(ax25);
347 }
348 }
349
350 /*
351 * dl1bke 960311: set parameters for existing AX.25 connections,
352 * includes a KILL command to abort any connection.
353 * VERY useful for debugging ;-)
354 */
355 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
356 {
357 struct ax25_ctl_struct ax25_ctl;
358 ax25_digi digi;
359 ax25_dev *ax25_dev;
360 ax25_cb *ax25;
361 unsigned int k;
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 digi.ndigi = ax25_ctl.digi_count;
373 for (k = 0; k < digi.ndigi; k++)
374 digi.calls[k] = ax25_ctl.digi_addr[k];
375
376 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
377 return -ENOTCONN;
378
379 switch (ax25_ctl.cmd) {
380 case AX25_KILL:
381 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
382 #ifdef CONFIG_AX25_DAMA_SLAVE
383 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
384 ax25_dama_off(ax25);
385 #endif
386 ax25_disconnect(ax25, ENETRESET);
387 break;
388
389 case AX25_WINDOW:
390 if (ax25->modulus == AX25_MODULUS) {
391 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
392 return -EINVAL;
393 } else {
394 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
395 return -EINVAL;
396 }
397 ax25->window = ax25_ctl.arg;
398 break;
399
400 case AX25_T1:
401 if (ax25_ctl.arg < 1)
402 return -EINVAL;
403 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
404 ax25->t1 = ax25_ctl.arg * HZ;
405 break;
406
407 case AX25_T2:
408 if (ax25_ctl.arg < 1)
409 return -EINVAL;
410 ax25->t2 = ax25_ctl.arg * HZ;
411 break;
412
413 case AX25_N2:
414 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
415 return -EINVAL;
416 ax25->n2count = 0;
417 ax25->n2 = ax25_ctl.arg;
418 break;
419
420 case AX25_T3:
421 if (ax25_ctl.arg < 0)
422 return -EINVAL;
423 ax25->t3 = ax25_ctl.arg * HZ;
424 break;
425
426 case AX25_IDLE:
427 if (ax25_ctl.arg < 0)
428 return -EINVAL;
429 ax25->idle = ax25_ctl.arg * 60 * HZ;
430 break;
431
432 case AX25_PACLEN:
433 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
434 return -EINVAL;
435 ax25->paclen = ax25_ctl.arg;
436 break;
437
438 default:
439 return -EINVAL;
440 }
441
442 return 0;
443 }
444
445 static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
446 {
447 ax25->rtt = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
448 ax25->t1 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
449 ax25->t2 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
450 ax25->t3 = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
451 ax25->n2 = ax25_dev->values[AX25_VALUES_N2];
452 ax25->paclen = ax25_dev->values[AX25_VALUES_PACLEN];
453 ax25->idle = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
454 ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
455
456 if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
457 ax25->modulus = AX25_EMODULUS;
458 ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
459 } else {
460 ax25->modulus = AX25_MODULUS;
461 ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
462 }
463 }
464
465 /*
466 * Fill in a created AX.25 created control block with the default
467 * values for a particular device.
468 */
469 void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
470 {
471 ax25->ax25_dev = ax25_dev;
472
473 if (ax25->ax25_dev != NULL) {
474 ax25_fillin_cb_from_dev(ax25, ax25_dev);
475 return;
476 }
477
478 /*
479 * No device, use kernel / AX.25 spec default values
480 */
481 ax25->rtt = msecs_to_jiffies(AX25_DEF_T1) / 2;
482 ax25->t1 = msecs_to_jiffies(AX25_DEF_T1);
483 ax25->t2 = msecs_to_jiffies(AX25_DEF_T2);
484 ax25->t3 = msecs_to_jiffies(AX25_DEF_T3);
485 ax25->n2 = AX25_DEF_N2;
486 ax25->paclen = AX25_DEF_PACLEN;
487 ax25->idle = msecs_to_jiffies(AX25_DEF_IDLE);
488 ax25->backoff = AX25_DEF_BACKOFF;
489
490 if (AX25_DEF_AXDEFMODE) {
491 ax25->modulus = AX25_EMODULUS;
492 ax25->window = AX25_DEF_EWINDOW;
493 } else {
494 ax25->modulus = AX25_MODULUS;
495 ax25->window = AX25_DEF_WINDOW;
496 }
497 }
498
499 /*
500 * Create an empty AX.25 control block.
501 */
502 ax25_cb *ax25_create_cb(void)
503 {
504 ax25_cb *ax25;
505
506 if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
507 return NULL;
508
509 atomic_set(&ax25->refcount, 1);
510
511 skb_queue_head_init(&ax25->write_queue);
512 skb_queue_head_init(&ax25->frag_queue);
513 skb_queue_head_init(&ax25->ack_queue);
514 skb_queue_head_init(&ax25->reseq_queue);
515
516 ax25_setup_timers(ax25);
517
518 ax25_fillin_cb(ax25, NULL);
519
520 ax25->state = AX25_STATE_0;
521
522 return ax25;
523 }
524
525 /*
526 * Handling for system calls applied via the various interfaces to an
527 * AX25 socket object
528 */
529
530 static int ax25_setsockopt(struct socket *sock, int level, int optname,
531 char __user *optval, int optlen)
532 {
533 struct sock *sk = sock->sk;
534 ax25_cb *ax25;
535 struct net_device *dev;
536 char devname[IFNAMSIZ];
537 int opt, res = 0;
538
539 if (level != SOL_AX25)
540 return -ENOPROTOOPT;
541
542 if (optlen < sizeof(int))
543 return -EINVAL;
544
545 if (get_user(opt, (int __user *)optval))
546 return -EFAULT;
547
548 lock_sock(sk);
549 ax25 = ax25_sk(sk);
550
551 switch (optname) {
552 case AX25_WINDOW:
553 if (ax25->modulus == AX25_MODULUS) {
554 if (opt < 1 || opt > 7) {
555 res = -EINVAL;
556 break;
557 }
558 } else {
559 if (opt < 1 || opt > 63) {
560 res = -EINVAL;
561 break;
562 }
563 }
564 ax25->window = opt;
565 break;
566
567 case AX25_T1:
568 if (opt < 1) {
569 res = -EINVAL;
570 break;
571 }
572 ax25->rtt = (opt * HZ) >> 1;
573 ax25->t1 = opt * HZ;
574 break;
575
576 case AX25_T2:
577 if (opt < 1) {
578 res = -EINVAL;
579 break;
580 }
581 ax25->t2 = opt * HZ;
582 break;
583
584 case AX25_N2:
585 if (opt < 1 || opt > 31) {
586 res = -EINVAL;
587 break;
588 }
589 ax25->n2 = opt;
590 break;
591
592 case AX25_T3:
593 if (opt < 1) {
594 res = -EINVAL;
595 break;
596 }
597 ax25->t3 = opt * HZ;
598 break;
599
600 case AX25_IDLE:
601 if (opt < 0) {
602 res = -EINVAL;
603 break;
604 }
605 ax25->idle = opt * 60 * HZ;
606 break;
607
608 case AX25_BACKOFF:
609 if (opt < 0 || opt > 2) {
610 res = -EINVAL;
611 break;
612 }
613 ax25->backoff = opt;
614 break;
615
616 case AX25_EXTSEQ:
617 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
618 break;
619
620 case AX25_PIDINCL:
621 ax25->pidincl = opt ? 1 : 0;
622 break;
623
624 case AX25_IAMDIGI:
625 ax25->iamdigi = opt ? 1 : 0;
626 break;
627
628 case AX25_PACLEN:
629 if (opt < 16 || opt > 65535) {
630 res = -EINVAL;
631 break;
632 }
633 ax25->paclen = opt;
634 break;
635
636 case SO_BINDTODEVICE:
637 if (optlen > IFNAMSIZ)
638 optlen=IFNAMSIZ;
639 if (copy_from_user(devname, optval, optlen)) {
640 res = -EFAULT;
641 break;
642 }
643
644 dev = dev_get_by_name(&init_net, devname);
645 if (dev == NULL) {
646 res = -ENODEV;
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 dev_put(dev);
655 break;
656 }
657
658 ax25->ax25_dev = ax25_dev_ax25dev(dev);
659 ax25_fillin_cb(ax25, ax25->ax25_dev);
660 break;
661
662 default:
663 res = -ENOPROTOOPT;
664 }
665 release_sock(sk);
666
667 return res;
668 }
669
670 static int ax25_getsockopt(struct socket *sock, int level, int optname,
671 char __user *optval, int __user *optlen)
672 {
673 struct sock *sk = sock->sk;
674 ax25_cb *ax25;
675 struct ax25_dev *ax25_dev;
676 char devname[IFNAMSIZ];
677 void *valptr;
678 int val = 0;
679 int maxlen, length;
680
681 if (level != SOL_AX25)
682 return -ENOPROTOOPT;
683
684 if (get_user(maxlen, optlen))
685 return -EFAULT;
686
687 if (maxlen < 1)
688 return -EFAULT;
689
690 valptr = (void *) &val;
691 length = min_t(unsigned int, maxlen, sizeof(int));
692
693 lock_sock(sk);
694 ax25 = ax25_sk(sk);
695
696 switch (optname) {
697 case AX25_WINDOW:
698 val = ax25->window;
699 break;
700
701 case AX25_T1:
702 val = ax25->t1 / HZ;
703 break;
704
705 case AX25_T2:
706 val = ax25->t2 / HZ;
707 break;
708
709 case AX25_N2:
710 val = ax25->n2;
711 break;
712
713 case AX25_T3:
714 val = ax25->t3 / HZ;
715 break;
716
717 case AX25_IDLE:
718 val = ax25->idle / (60 * HZ);
719 break;
720
721 case AX25_BACKOFF:
722 val = ax25->backoff;
723 break;
724
725 case AX25_EXTSEQ:
726 val = (ax25->modulus == AX25_EMODULUS);
727 break;
728
729 case AX25_PIDINCL:
730 val = ax25->pidincl;
731 break;
732
733 case AX25_IAMDIGI:
734 val = ax25->iamdigi;
735 break;
736
737 case AX25_PACLEN:
738 val = ax25->paclen;
739 break;
740
741 case SO_BINDTODEVICE:
742 ax25_dev = ax25->ax25_dev;
743
744 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
745 strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
746 length = strlen(devname) + 1;
747 } else {
748 *devname = '\0';
749 length = 1;
750 }
751
752 valptr = (void *) devname;
753 break;
754
755 default:
756 release_sock(sk);
757 return -ENOPROTOOPT;
758 }
759 release_sock(sk);
760
761 if (put_user(length, optlen))
762 return -EFAULT;
763
764 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
765 }
766
767 static int ax25_listen(struct socket *sock, int backlog)
768 {
769 struct sock *sk = sock->sk;
770 int res = 0;
771
772 lock_sock(sk);
773 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
774 sk->sk_max_ack_backlog = backlog;
775 sk->sk_state = TCP_LISTEN;
776 goto out;
777 }
778 res = -EOPNOTSUPP;
779
780 out:
781 release_sock(sk);
782
783 return res;
784 }
785
786 /*
787 * XXX: when creating ax25_sock we should update the .obj_size setting
788 * below.
789 */
790 static struct proto ax25_proto = {
791 .name = "AX25",
792 .owner = THIS_MODULE,
793 .obj_size = sizeof(struct sock),
794 };
795
796 static int ax25_create(struct net *net, struct socket *sock, int protocol)
797 {
798 struct sock *sk;
799 ax25_cb *ax25;
800
801 if (net != &init_net)
802 return -EAFNOSUPPORT;
803
804 switch (sock->type) {
805 case SOCK_DGRAM:
806 if (protocol == 0 || protocol == PF_AX25)
807 protocol = AX25_P_TEXT;
808 break;
809
810 case SOCK_SEQPACKET:
811 switch (protocol) {
812 case 0:
813 case PF_AX25: /* For CLX */
814 protocol = AX25_P_TEXT;
815 break;
816 case AX25_P_SEGMENT:
817 #ifdef CONFIG_INET
818 case AX25_P_ARP:
819 case AX25_P_IP:
820 #endif
821 #ifdef CONFIG_NETROM
822 case AX25_P_NETROM:
823 #endif
824 #ifdef CONFIG_ROSE
825 case AX25_P_ROSE:
826 #endif
827 return -ESOCKTNOSUPPORT;
828 #ifdef CONFIG_NETROM_MODULE
829 case AX25_P_NETROM:
830 if (ax25_protocol_is_registered(AX25_P_NETROM))
831 return -ESOCKTNOSUPPORT;
832 #endif
833 #ifdef CONFIG_ROSE_MODULE
834 case AX25_P_ROSE:
835 if (ax25_protocol_is_registered(AX25_P_ROSE))
836 return -ESOCKTNOSUPPORT;
837 #endif
838 default:
839 break;
840 }
841 break;
842
843 case SOCK_RAW:
844 break;
845 default:
846 return -ESOCKTNOSUPPORT;
847 }
848
849 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto);
850 if (sk == NULL)
851 return -ENOMEM;
852
853 ax25 = sk->sk_protinfo = ax25_create_cb();
854 if (!ax25) {
855 sk_free(sk);
856 return -ENOMEM;
857 }
858
859 sock_init_data(sock, sk);
860
861 sk->sk_destruct = ax25_free_sock;
862 sock->ops = &ax25_proto_ops;
863 sk->sk_protocol = protocol;
864
865 ax25->sk = sk;
866
867 return 0;
868 }
869
870 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
871 {
872 struct sock *sk;
873 ax25_cb *ax25, *oax25;
874
875 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot);
876 if (sk == NULL)
877 return NULL;
878
879 if ((ax25 = ax25_create_cb()) == NULL) {
880 sk_free(sk);
881 return NULL;
882 }
883
884 switch (osk->sk_type) {
885 case SOCK_DGRAM:
886 break;
887 case SOCK_SEQPACKET:
888 break;
889 default:
890 sk_free(sk);
891 ax25_cb_put(ax25);
892 return NULL;
893 }
894
895 sock_init_data(NULL, sk);
896
897 sk->sk_destruct = ax25_free_sock;
898 sk->sk_type = osk->sk_type;
899 sk->sk_priority = osk->sk_priority;
900 sk->sk_protocol = osk->sk_protocol;
901 sk->sk_rcvbuf = osk->sk_rcvbuf;
902 sk->sk_sndbuf = osk->sk_sndbuf;
903 sk->sk_state = TCP_ESTABLISHED;
904 sock_copy_flags(sk, osk);
905
906 oax25 = ax25_sk(osk);
907
908 ax25->modulus = oax25->modulus;
909 ax25->backoff = oax25->backoff;
910 ax25->pidincl = oax25->pidincl;
911 ax25->iamdigi = oax25->iamdigi;
912 ax25->rtt = oax25->rtt;
913 ax25->t1 = oax25->t1;
914 ax25->t2 = oax25->t2;
915 ax25->t3 = oax25->t3;
916 ax25->n2 = oax25->n2;
917 ax25->idle = oax25->idle;
918 ax25->paclen = oax25->paclen;
919 ax25->window = oax25->window;
920
921 ax25->ax25_dev = ax25_dev;
922 ax25->source_addr = oax25->source_addr;
923
924 if (oax25->digipeat != NULL) {
925 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
926 GFP_ATOMIC);
927 if (ax25->digipeat == NULL) {
928 sk_free(sk);
929 ax25_cb_put(ax25);
930 return NULL;
931 }
932 }
933
934 sk->sk_protinfo = ax25;
935 ax25->sk = sk;
936
937 return sk;
938 }
939
940 static int ax25_release(struct socket *sock)
941 {
942 struct sock *sk = sock->sk;
943 ax25_cb *ax25;
944
945 if (sk == NULL)
946 return 0;
947
948 sock_hold(sk);
949 sock_orphan(sk);
950 lock_sock(sk);
951 ax25 = ax25_sk(sk);
952
953 if (sk->sk_type == SOCK_SEQPACKET) {
954 switch (ax25->state) {
955 case AX25_STATE_0:
956 release_sock(sk);
957 ax25_disconnect(ax25, 0);
958 lock_sock(sk);
959 ax25_destroy_socket(ax25);
960 break;
961
962 case AX25_STATE_1:
963 case AX25_STATE_2:
964 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
965 release_sock(sk);
966 ax25_disconnect(ax25, 0);
967 lock_sock(sk);
968 ax25_destroy_socket(ax25);
969 break;
970
971 case AX25_STATE_3:
972 case AX25_STATE_4:
973 ax25_clear_queues(ax25);
974 ax25->n2count = 0;
975
976 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
977 case AX25_PROTO_STD_SIMPLEX:
978 case AX25_PROTO_STD_DUPLEX:
979 ax25_send_control(ax25,
980 AX25_DISC,
981 AX25_POLLON,
982 AX25_COMMAND);
983 ax25_stop_t2timer(ax25);
984 ax25_stop_t3timer(ax25);
985 ax25_stop_idletimer(ax25);
986 break;
987 #ifdef CONFIG_AX25_DAMA_SLAVE
988 case AX25_PROTO_DAMA_SLAVE:
989 ax25_stop_t3timer(ax25);
990 ax25_stop_idletimer(ax25);
991 break;
992 #endif
993 }
994 ax25_calculate_t1(ax25);
995 ax25_start_t1timer(ax25);
996 ax25->state = AX25_STATE_2;
997 sk->sk_state = TCP_CLOSE;
998 sk->sk_shutdown |= SEND_SHUTDOWN;
999 sk->sk_state_change(sk);
1000 sock_set_flag(sk, SOCK_DESTROY);
1001 break;
1002
1003 default:
1004 break;
1005 }
1006 } else {
1007 sk->sk_state = TCP_CLOSE;
1008 sk->sk_shutdown |= SEND_SHUTDOWN;
1009 sk->sk_state_change(sk);
1010 ax25_destroy_socket(ax25);
1011 }
1012
1013 sock->sk = NULL;
1014 release_sock(sk);
1015 sock_put(sk);
1016
1017 return 0;
1018 }
1019
1020 /*
1021 * We support a funny extension here so you can (as root) give any callsign
1022 * digipeated via a local address as source. This hack is obsolete now
1023 * that we've implemented support for SO_BINDTODEVICE. It is however small
1024 * and trivially backward compatible.
1025 */
1026 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1027 {
1028 struct sock *sk = sock->sk;
1029 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1030 ax25_dev *ax25_dev = NULL;
1031 ax25_uid_assoc *user;
1032 ax25_address call;
1033 ax25_cb *ax25;
1034 int err = 0;
1035
1036 if (addr_len != sizeof(struct sockaddr_ax25) &&
1037 addr_len != sizeof(struct full_sockaddr_ax25))
1038 /* support for old structure may go away some time
1039 * ax25_bind(): uses old (6 digipeater) socket structure.
1040 */
1041 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1042 (addr_len > sizeof(struct full_sockaddr_ax25)))
1043 return -EINVAL;
1044
1045 if (addr->fsa_ax25.sax25_family != AF_AX25)
1046 return -EINVAL;
1047
1048 user = ax25_findbyuid(current_euid());
1049 if (user) {
1050 call = user->call;
1051 ax25_uid_put(user);
1052 } else {
1053 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1054 return -EACCES;
1055
1056 call = addr->fsa_ax25.sax25_call;
1057 }
1058
1059 lock_sock(sk);
1060
1061 ax25 = ax25_sk(sk);
1062 if (!sock_flag(sk, SOCK_ZAPPED)) {
1063 err = -EINVAL;
1064 goto out;
1065 }
1066
1067 ax25->source_addr = call;
1068
1069 /*
1070 * User already set interface with SO_BINDTODEVICE
1071 */
1072 if (ax25->ax25_dev != NULL)
1073 goto done;
1074
1075 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1076 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1077 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1078 err = -EADDRNOTAVAIL;
1079 goto out;
1080 }
1081 } else {
1082 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1083 err = -EADDRNOTAVAIL;
1084 goto out;
1085 }
1086 }
1087
1088 if (ax25_dev != NULL)
1089 ax25_fillin_cb(ax25, ax25_dev);
1090
1091 done:
1092 ax25_cb_add(ax25);
1093 sock_reset_flag(sk, SOCK_ZAPPED);
1094
1095 out:
1096 release_sock(sk);
1097
1098 return 0;
1099 }
1100
1101 /*
1102 * FIXME: nonblock behaviour looks like it may have a bug.
1103 */
1104 static int __must_check ax25_connect(struct socket *sock,
1105 struct sockaddr *uaddr, int addr_len, int flags)
1106 {
1107 struct sock *sk = sock->sk;
1108 ax25_cb *ax25 = ax25_sk(sk), *ax25t;
1109 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1110 ax25_digi *digi = NULL;
1111 int ct = 0, err = 0;
1112
1113 /*
1114 * some sanity checks. code further down depends on this
1115 */
1116
1117 if (addr_len == sizeof(struct sockaddr_ax25))
1118 /* support for this will go away in early 2.5.x
1119 * ax25_connect(): uses obsolete socket structure
1120 */
1121 ;
1122 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1123 /* support for old structure may go away some time
1124 * ax25_connect(): uses old (6 digipeater) socket structure.
1125 */
1126 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1127 (addr_len > sizeof(struct full_sockaddr_ax25)))
1128 return -EINVAL;
1129
1130
1131 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1132 return -EINVAL;
1133
1134 lock_sock(sk);
1135
1136 /* deal with restarts */
1137 if (sock->state == SS_CONNECTING) {
1138 switch (sk->sk_state) {
1139 case TCP_SYN_SENT: /* still trying */
1140 err = -EINPROGRESS;
1141 goto out_release;
1142
1143 case TCP_ESTABLISHED: /* connection established */
1144 sock->state = SS_CONNECTED;
1145 goto out_release;
1146
1147 case TCP_CLOSE: /* connection refused */
1148 sock->state = SS_UNCONNECTED;
1149 err = -ECONNREFUSED;
1150 goto out_release;
1151 }
1152 }
1153
1154 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1155 err = -EISCONN; /* No reconnect on a seqpacket socket */
1156 goto out_release;
1157 }
1158
1159 sk->sk_state = TCP_CLOSE;
1160 sock->state = SS_UNCONNECTED;
1161
1162 kfree(ax25->digipeat);
1163 ax25->digipeat = NULL;
1164
1165 /*
1166 * Handle digi-peaters to be used.
1167 */
1168 if (addr_len > sizeof(struct sockaddr_ax25) &&
1169 fsa->fsa_ax25.sax25_ndigis != 0) {
1170 /* Valid number of digipeaters ? */
1171 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1172 err = -EINVAL;
1173 goto out_release;
1174 }
1175
1176 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1177 err = -ENOBUFS;
1178 goto out_release;
1179 }
1180
1181 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1182 digi->lastrepeat = -1;
1183
1184 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1185 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1186 AX25_HBIT) && ax25->iamdigi) {
1187 digi->repeated[ct] = 1;
1188 digi->lastrepeat = ct;
1189 } else {
1190 digi->repeated[ct] = 0;
1191 }
1192 digi->calls[ct] = fsa->fsa_digipeater[ct];
1193 ct++;
1194 }
1195 }
1196
1197 /*
1198 * Must bind first - autobinding in this may or may not work. If
1199 * the socket is already bound, check to see if the device has
1200 * been filled in, error if it hasn't.
1201 */
1202 if (sock_flag(sk, SOCK_ZAPPED)) {
1203 /* check if we can remove this feature. It is broken. */
1204 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1205 current->comm);
1206 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1207 kfree(digi);
1208 goto out_release;
1209 }
1210
1211 ax25_fillin_cb(ax25, ax25->ax25_dev);
1212 ax25_cb_add(ax25);
1213 } else {
1214 if (ax25->ax25_dev == NULL) {
1215 kfree(digi);
1216 err = -EHOSTUNREACH;
1217 goto out_release;
1218 }
1219 }
1220
1221 if (sk->sk_type == SOCK_SEQPACKET &&
1222 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1223 ax25->ax25_dev->dev))) {
1224 kfree(digi);
1225 err = -EADDRINUSE; /* Already such a connection */
1226 ax25_cb_put(ax25t);
1227 goto out_release;
1228 }
1229
1230 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1231 ax25->digipeat = digi;
1232
1233 /* First the easy one */
1234 if (sk->sk_type != SOCK_SEQPACKET) {
1235 sock->state = SS_CONNECTED;
1236 sk->sk_state = TCP_ESTABLISHED;
1237 goto out_release;
1238 }
1239
1240 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1241 sock->state = SS_CONNECTING;
1242 sk->sk_state = TCP_SYN_SENT;
1243
1244 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1245 case AX25_PROTO_STD_SIMPLEX:
1246 case AX25_PROTO_STD_DUPLEX:
1247 ax25_std_establish_data_link(ax25);
1248 break;
1249
1250 #ifdef CONFIG_AX25_DAMA_SLAVE
1251 case AX25_PROTO_DAMA_SLAVE:
1252 ax25->modulus = AX25_MODULUS;
1253 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1254 if (ax25->ax25_dev->dama.slave)
1255 ax25_ds_establish_data_link(ax25);
1256 else
1257 ax25_std_establish_data_link(ax25);
1258 break;
1259 #endif
1260 }
1261
1262 ax25->state = AX25_STATE_1;
1263
1264 ax25_start_heartbeat(ax25);
1265
1266 /* Now the loop */
1267 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1268 err = -EINPROGRESS;
1269 goto out_release;
1270 }
1271
1272 if (sk->sk_state == TCP_SYN_SENT) {
1273 DEFINE_WAIT(wait);
1274
1275 for (;;) {
1276 prepare_to_wait(sk->sk_sleep, &wait,
1277 TASK_INTERRUPTIBLE);
1278 if (sk->sk_state != TCP_SYN_SENT)
1279 break;
1280 if (!signal_pending(current)) {
1281 release_sock(sk);
1282 schedule();
1283 lock_sock(sk);
1284 continue;
1285 }
1286 err = -ERESTARTSYS;
1287 break;
1288 }
1289 finish_wait(sk->sk_sleep, &wait);
1290
1291 if (err)
1292 goto out_release;
1293 }
1294
1295 if (sk->sk_state != TCP_ESTABLISHED) {
1296 /* Not in ABM, not in WAIT_UA -> failed */
1297 sock->state = SS_UNCONNECTED;
1298 err = sock_error(sk); /* Always set at this point */
1299 goto out_release;
1300 }
1301
1302 sock->state = SS_CONNECTED;
1303
1304 err = 0;
1305 out_release:
1306 release_sock(sk);
1307
1308 return err;
1309 }
1310
1311 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags)
1312 {
1313 struct sk_buff *skb;
1314 struct sock *newsk;
1315 DEFINE_WAIT(wait);
1316 struct sock *sk;
1317 int err = 0;
1318
1319 if (sock->state != SS_UNCONNECTED)
1320 return -EINVAL;
1321
1322 if ((sk = sock->sk) == NULL)
1323 return -EINVAL;
1324
1325 lock_sock(sk);
1326 if (sk->sk_type != SOCK_SEQPACKET) {
1327 err = -EOPNOTSUPP;
1328 goto out;
1329 }
1330
1331 if (sk->sk_state != TCP_LISTEN) {
1332 err = -EINVAL;
1333 goto out;
1334 }
1335
1336 /*
1337 * The read queue this time is holding sockets ready to use
1338 * hooked into the SABM we saved
1339 */
1340 for (;;) {
1341 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1342 skb = skb_dequeue(&sk->sk_receive_queue);
1343 if (skb)
1344 break;
1345
1346 if (flags & O_NONBLOCK) {
1347 err = -EWOULDBLOCK;
1348 break;
1349 }
1350 if (!signal_pending(current)) {
1351 release_sock(sk);
1352 schedule();
1353 lock_sock(sk);
1354 continue;
1355 }
1356 err = -ERESTARTSYS;
1357 break;
1358 }
1359 finish_wait(sk->sk_sleep, &wait);
1360
1361 if (err)
1362 goto out;
1363
1364 newsk = skb->sk;
1365 sock_graft(newsk, newsock);
1366
1367 /* Now attach up the new socket */
1368 kfree_skb(skb);
1369 sk->sk_ack_backlog--;
1370 newsock->state = SS_CONNECTED;
1371
1372 out:
1373 release_sock(sk);
1374
1375 return err;
1376 }
1377
1378 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1379 int *uaddr_len, int peer)
1380 {
1381 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1382 struct sock *sk = sock->sk;
1383 unsigned char ndigi, i;
1384 ax25_cb *ax25;
1385 int err = 0;
1386
1387 lock_sock(sk);
1388 ax25 = ax25_sk(sk);
1389
1390 if (peer != 0) {
1391 if (sk->sk_state != TCP_ESTABLISHED) {
1392 err = -ENOTCONN;
1393 goto out;
1394 }
1395
1396 fsa->fsa_ax25.sax25_family = AF_AX25;
1397 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1398 fsa->fsa_ax25.sax25_ndigis = 0;
1399
1400 if (ax25->digipeat != NULL) {
1401 ndigi = ax25->digipeat->ndigi;
1402 fsa->fsa_ax25.sax25_ndigis = ndigi;
1403 for (i = 0; i < ndigi; i++)
1404 fsa->fsa_digipeater[i] =
1405 ax25->digipeat->calls[i];
1406 }
1407 } else {
1408 fsa->fsa_ax25.sax25_family = AF_AX25;
1409 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1410 fsa->fsa_ax25.sax25_ndigis = 1;
1411 if (ax25->ax25_dev != NULL) {
1412 memcpy(&fsa->fsa_digipeater[0],
1413 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1414 } else {
1415 fsa->fsa_digipeater[0] = null_ax25_address;
1416 }
1417 }
1418 *uaddr_len = sizeof (struct full_sockaddr_ax25);
1419
1420 out:
1421 release_sock(sk);
1422
1423 return err;
1424 }
1425
1426 static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
1427 struct msghdr *msg, size_t len)
1428 {
1429 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1430 struct sock *sk = sock->sk;
1431 struct sockaddr_ax25 sax;
1432 struct sk_buff *skb;
1433 ax25_digi dtmp, *dp;
1434 ax25_cb *ax25;
1435 size_t size;
1436 int lv, err, addr_len = msg->msg_namelen;
1437
1438 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1439 return -EINVAL;
1440
1441 lock_sock(sk);
1442 ax25 = ax25_sk(sk);
1443
1444 if (sock_flag(sk, SOCK_ZAPPED)) {
1445 err = -EADDRNOTAVAIL;
1446 goto out;
1447 }
1448
1449 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1450 send_sig(SIGPIPE, current, 0);
1451 err = -EPIPE;
1452 goto out;
1453 }
1454
1455 if (ax25->ax25_dev == NULL) {
1456 err = -ENETUNREACH;
1457 goto out;
1458 }
1459
1460 if (len > ax25->ax25_dev->dev->mtu) {
1461 err = -EMSGSIZE;
1462 goto out;
1463 }
1464
1465 if (usax != NULL) {
1466 if (usax->sax25_family != AF_AX25) {
1467 err = -EINVAL;
1468 goto out;
1469 }
1470
1471 if (addr_len == sizeof(struct sockaddr_ax25))
1472 /* ax25_sendmsg(): uses obsolete socket structure */
1473 ;
1474 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1475 /* support for old structure may go away some time
1476 * ax25_sendmsg(): uses old (6 digipeater)
1477 * socket structure.
1478 */
1479 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1480 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1481 err = -EINVAL;
1482 goto out;
1483 }
1484
1485
1486 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1487 int ct = 0;
1488 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1489
1490 /* Valid number of digipeaters ? */
1491 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1492 err = -EINVAL;
1493 goto out;
1494 }
1495
1496 dtmp.ndigi = usax->sax25_ndigis;
1497
1498 while (ct < usax->sax25_ndigis) {
1499 dtmp.repeated[ct] = 0;
1500 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1501 ct++;
1502 }
1503
1504 dtmp.lastrepeat = 0;
1505 }
1506
1507 sax = *usax;
1508 if (sk->sk_type == SOCK_SEQPACKET &&
1509 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1510 err = -EISCONN;
1511 goto out;
1512 }
1513 if (usax->sax25_ndigis == 0)
1514 dp = NULL;
1515 else
1516 dp = &dtmp;
1517 } else {
1518 /*
1519 * FIXME: 1003.1g - if the socket is like this because
1520 * it has become closed (not started closed) and is VC
1521 * we ought to SIGPIPE, EPIPE
1522 */
1523 if (sk->sk_state != TCP_ESTABLISHED) {
1524 err = -ENOTCONN;
1525 goto out;
1526 }
1527 sax.sax25_family = AF_AX25;
1528 sax.sax25_call = ax25->dest_addr;
1529 dp = ax25->digipeat;
1530 }
1531
1532 SOCK_DEBUG(sk, "AX.25: sendto: Addresses built.\n");
1533
1534 /* Build a packet */
1535 SOCK_DEBUG(sk, "AX.25: sendto: building packet.\n");
1536
1537 /* Assume the worst case */
1538 size = len + ax25->ax25_dev->dev->hard_header_len;
1539
1540 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1541 if (skb == NULL)
1542 goto out;
1543
1544 skb_reserve(skb, size - len);
1545
1546 SOCK_DEBUG(sk, "AX.25: Appending user data\n");
1547
1548 /* User data follows immediately after the AX.25 data */
1549 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1550 err = -EFAULT;
1551 kfree_skb(skb);
1552 goto out;
1553 }
1554
1555 skb_reset_network_header(skb);
1556
1557 /* Add the PID if one is not supplied by the user in the skb */
1558 if (!ax25->pidincl)
1559 *skb_push(skb, 1) = sk->sk_protocol;
1560
1561 SOCK_DEBUG(sk, "AX.25: Transmitting buffer\n");
1562
1563 if (sk->sk_type == SOCK_SEQPACKET) {
1564 /* Connected mode sockets go via the LAPB machine */
1565 if (sk->sk_state != TCP_ESTABLISHED) {
1566 kfree_skb(skb);
1567 err = -ENOTCONN;
1568 goto out;
1569 }
1570
1571 /* Shove it onto the queue and kick */
1572 ax25_output(ax25, ax25->paclen, skb);
1573
1574 err = len;
1575 goto out;
1576 }
1577
1578 skb_push(skb, 1 + ax25_addr_size(dp));
1579
1580 SOCK_DEBUG(sk, "Building AX.25 Header (dp=%p).\n", dp);
1581
1582 if (dp != NULL)
1583 SOCK_DEBUG(sk, "Num digipeaters=%d\n", dp->ndigi);
1584
1585 /* Build an AX.25 header */
1586 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1587 dp, AX25_COMMAND, AX25_MODULUS);
1588
1589 SOCK_DEBUG(sk, "Built header (%d bytes)\n",lv);
1590
1591 skb_set_transport_header(skb, lv);
1592
1593 SOCK_DEBUG(sk, "base=%p pos=%p\n",
1594 skb->data, skb_transport_header(skb));
1595
1596 *skb_transport_header(skb) = AX25_UI;
1597
1598 /* Datagram frames go straight out of the door as UI */
1599 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1600
1601 err = len;
1602
1603 out:
1604 release_sock(sk);
1605
1606 return err;
1607 }
1608
1609 static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock,
1610 struct msghdr *msg, size_t size, int flags)
1611 {
1612 struct sock *sk = sock->sk;
1613 struct sk_buff *skb;
1614 int copied;
1615 int err = 0;
1616
1617 lock_sock(sk);
1618 /*
1619 * This works for seqpacket too. The receiver has ordered the
1620 * queue for us! We do one quick check first though
1621 */
1622 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1623 err = -ENOTCONN;
1624 goto out;
1625 }
1626
1627 /* Now we can treat all alike */
1628 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1629 flags & MSG_DONTWAIT, &err);
1630 if (skb == NULL)
1631 goto out;
1632
1633 if (!ax25_sk(sk)->pidincl)
1634 skb_pull(skb, 1); /* Remove PID */
1635
1636 skb_reset_transport_header(skb);
1637 copied = skb->len;
1638
1639 if (copied > size) {
1640 copied = size;
1641 msg->msg_flags |= MSG_TRUNC;
1642 }
1643
1644 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1645
1646 if (msg->msg_namelen != 0) {
1647 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1648 ax25_digi digi;
1649 ax25_address src;
1650 const unsigned char *mac = skb_mac_header(skb);
1651
1652 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1653 &digi, NULL, NULL);
1654 sax->sax25_family = AF_AX25;
1655 /* We set this correctly, even though we may not let the
1656 application know the digi calls further down (because it
1657 did NOT ask to know them). This could get political... **/
1658 sax->sax25_ndigis = digi.ndigi;
1659 sax->sax25_call = src;
1660
1661 if (sax->sax25_ndigis != 0) {
1662 int ct;
1663 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1664
1665 for (ct = 0; ct < digi.ndigi; ct++)
1666 fsa->fsa_digipeater[ct] = digi.calls[ct];
1667 }
1668 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1669 }
1670
1671 skb_free_datagram(sk, skb);
1672 err = copied;
1673
1674 out:
1675 release_sock(sk);
1676
1677 return err;
1678 }
1679
1680 static int ax25_shutdown(struct socket *sk, int how)
1681 {
1682 /* FIXME - generate DM and RNR states */
1683 return -EOPNOTSUPP;
1684 }
1685
1686 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1687 {
1688 struct sock *sk = sock->sk;
1689 void __user *argp = (void __user *)arg;
1690 int res = 0;
1691
1692 lock_sock(sk);
1693 switch (cmd) {
1694 case TIOCOUTQ: {
1695 long amount;
1696 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1697 if (amount < 0)
1698 amount = 0;
1699 res = put_user(amount, (int __user *)argp);
1700 break;
1701 }
1702
1703 case TIOCINQ: {
1704 struct sk_buff *skb;
1705 long amount = 0L;
1706 /* These two are safe on a single CPU system as only user tasks fiddle here */
1707 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1708 amount = skb->len;
1709 res = put_user(amount, (int __user *) argp);
1710 break;
1711 }
1712
1713 case SIOCGSTAMP:
1714 res = sock_get_timestamp(sk, argp);
1715 break;
1716
1717 case SIOCGSTAMPNS:
1718 res = sock_get_timestampns(sk, argp);
1719 break;
1720
1721 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1722 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1723 case SIOCAX25GETUID: {
1724 struct sockaddr_ax25 sax25;
1725 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1726 res = -EFAULT;
1727 break;
1728 }
1729 res = ax25_uid_ioctl(cmd, &sax25);
1730 break;
1731 }
1732
1733 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1734 long amount;
1735 if (!capable(CAP_NET_ADMIN)) {
1736 res = -EPERM;
1737 break;
1738 }
1739 if (get_user(amount, (long __user *)argp)) {
1740 res = -EFAULT;
1741 break;
1742 }
1743 if (amount > AX25_NOUID_BLOCK) {
1744 res = -EINVAL;
1745 break;
1746 }
1747 ax25_uid_policy = amount;
1748 res = 0;
1749 break;
1750 }
1751
1752 case SIOCADDRT:
1753 case SIOCDELRT:
1754 case SIOCAX25OPTRT:
1755 if (!capable(CAP_NET_ADMIN)) {
1756 res = -EPERM;
1757 break;
1758 }
1759 res = ax25_rt_ioctl(cmd, argp);
1760 break;
1761
1762 case SIOCAX25CTLCON:
1763 if (!capable(CAP_NET_ADMIN)) {
1764 res = -EPERM;
1765 break;
1766 }
1767 res = ax25_ctl_ioctl(cmd, argp);
1768 break;
1769
1770 case SIOCAX25GETINFO:
1771 case SIOCAX25GETINFOOLD: {
1772 ax25_cb *ax25 = ax25_sk(sk);
1773 struct ax25_info_struct ax25_info;
1774
1775 ax25_info.t1 = ax25->t1 / HZ;
1776 ax25_info.t2 = ax25->t2 / HZ;
1777 ax25_info.t3 = ax25->t3 / HZ;
1778 ax25_info.idle = ax25->idle / (60 * HZ);
1779 ax25_info.n2 = ax25->n2;
1780 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1781 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1782 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1783 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1784 ax25_info.n2count = ax25->n2count;
1785 ax25_info.state = ax25->state;
1786 ax25_info.rcv_q = atomic_read(&sk->sk_rmem_alloc);
1787 ax25_info.snd_q = atomic_read(&sk->sk_wmem_alloc);
1788 ax25_info.vs = ax25->vs;
1789 ax25_info.vr = ax25->vr;
1790 ax25_info.va = ax25->va;
1791 ax25_info.vs_max = ax25->vs; /* reserved */
1792 ax25_info.paclen = ax25->paclen;
1793 ax25_info.window = ax25->window;
1794
1795 /* old structure? */
1796 if (cmd == SIOCAX25GETINFOOLD) {
1797 static int warned = 0;
1798 if (!warned) {
1799 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1800 current->comm);
1801 warned=1;
1802 }
1803
1804 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1805 res = -EFAULT;
1806 break;
1807 }
1808 } else {
1809 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1810 res = -EINVAL;
1811 break;
1812 }
1813 }
1814 res = 0;
1815 break;
1816 }
1817
1818 case SIOCAX25ADDFWD:
1819 case SIOCAX25DELFWD: {
1820 struct ax25_fwd_struct ax25_fwd;
1821 if (!capable(CAP_NET_ADMIN)) {
1822 res = -EPERM;
1823 break;
1824 }
1825 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1826 res = -EFAULT;
1827 break;
1828 }
1829 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1830 break;
1831 }
1832
1833 case SIOCGIFADDR:
1834 case SIOCSIFADDR:
1835 case SIOCGIFDSTADDR:
1836 case SIOCSIFDSTADDR:
1837 case SIOCGIFBRDADDR:
1838 case SIOCSIFBRDADDR:
1839 case SIOCGIFNETMASK:
1840 case SIOCSIFNETMASK:
1841 case SIOCGIFMETRIC:
1842 case SIOCSIFMETRIC:
1843 res = -EINVAL;
1844 break;
1845
1846 default:
1847 res = -ENOIOCTLCMD;
1848 break;
1849 }
1850 release_sock(sk);
1851
1852 return res;
1853 }
1854
1855 #ifdef CONFIG_PROC_FS
1856
1857 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1858 __acquires(ax25_list_lock)
1859 {
1860 struct ax25_cb *ax25;
1861 struct hlist_node *node;
1862 int i = 0;
1863
1864 spin_lock_bh(&ax25_list_lock);
1865 ax25_for_each(ax25, node, &ax25_list) {
1866 if (i == *pos)
1867 return ax25;
1868 ++i;
1869 }
1870 return NULL;
1871 }
1872
1873 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1874 {
1875 ++*pos;
1876
1877 return hlist_entry( ((struct ax25_cb *)v)->ax25_node.next,
1878 struct ax25_cb, ax25_node);
1879 }
1880
1881 static void ax25_info_stop(struct seq_file *seq, void *v)
1882 __releases(ax25_list_lock)
1883 {
1884 spin_unlock_bh(&ax25_list_lock);
1885 }
1886
1887 static int ax25_info_show(struct seq_file *seq, void *v)
1888 {
1889 ax25_cb *ax25 = v;
1890 char buf[11];
1891 int k;
1892
1893
1894 /*
1895 * New format:
1896 * 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
1897 */
1898
1899 seq_printf(seq, "%8.8lx %s %s%s ",
1900 (long) ax25,
1901 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1902 ax2asc(buf, &ax25->source_addr),
1903 ax25->iamdigi? "*":"");
1904 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1905
1906 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1907 seq_printf(seq, ",%s%s",
1908 ax2asc(buf, &ax25->digipeat->calls[k]),
1909 ax25->digipeat->repeated[k]? "*":"");
1910 }
1911
1912 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1913 ax25->state,
1914 ax25->vs, ax25->vr, ax25->va,
1915 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1916 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1917 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1918 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1919 ax25->idle / (60 * HZ),
1920 ax25->n2count, ax25->n2,
1921 ax25->rtt / HZ,
1922 ax25->window,
1923 ax25->paclen);
1924
1925 if (ax25->sk != NULL) {
1926 seq_printf(seq, " %d %d %lu\n",
1927 atomic_read(&ax25->sk->sk_wmem_alloc),
1928 atomic_read(&ax25->sk->sk_rmem_alloc),
1929 sock_i_ino(ax25->sk));
1930 } else {
1931 seq_puts(seq, " * * *\n");
1932 }
1933 return 0;
1934 }
1935
1936 static const struct seq_operations ax25_info_seqops = {
1937 .start = ax25_info_start,
1938 .next = ax25_info_next,
1939 .stop = ax25_info_stop,
1940 .show = ax25_info_show,
1941 };
1942
1943 static int ax25_info_open(struct inode *inode, struct file *file)
1944 {
1945 return seq_open(file, &ax25_info_seqops);
1946 }
1947
1948 static const struct file_operations ax25_info_fops = {
1949 .owner = THIS_MODULE,
1950 .open = ax25_info_open,
1951 .read = seq_read,
1952 .llseek = seq_lseek,
1953 .release = seq_release,
1954 };
1955
1956 #endif
1957
1958 static struct net_proto_family ax25_family_ops = {
1959 .family = PF_AX25,
1960 .create = ax25_create,
1961 .owner = THIS_MODULE,
1962 };
1963
1964 static const struct proto_ops ax25_proto_ops = {
1965 .family = PF_AX25,
1966 .owner = THIS_MODULE,
1967 .release = ax25_release,
1968 .bind = ax25_bind,
1969 .connect = ax25_connect,
1970 .socketpair = sock_no_socketpair,
1971 .accept = ax25_accept,
1972 .getname = ax25_getname,
1973 .poll = datagram_poll,
1974 .ioctl = ax25_ioctl,
1975 .listen = ax25_listen,
1976 .shutdown = ax25_shutdown,
1977 .setsockopt = ax25_setsockopt,
1978 .getsockopt = ax25_getsockopt,
1979 .sendmsg = ax25_sendmsg,
1980 .recvmsg = ax25_recvmsg,
1981 .mmap = sock_no_mmap,
1982 .sendpage = sock_no_sendpage,
1983 };
1984
1985 /*
1986 * Called by socket.c on kernel start up
1987 */
1988 static struct packet_type ax25_packet_type = {
1989 .type = __constant_htons(ETH_P_AX25),
1990 .dev = NULL, /* All devices */
1991 .func = ax25_kiss_rcv,
1992 };
1993
1994 static struct notifier_block ax25_dev_notifier = {
1995 .notifier_call =ax25_device_event,
1996 };
1997
1998 static int __init ax25_init(void)
1999 {
2000 int rc = proto_register(&ax25_proto, 0);
2001
2002 if (rc != 0)
2003 goto out;
2004
2005 sock_register(&ax25_family_ops);
2006 dev_add_pack(&ax25_packet_type);
2007 register_netdevice_notifier(&ax25_dev_notifier);
2008 ax25_register_sysctl();
2009
2010 proc_net_fops_create(&init_net, "ax25_route", S_IRUGO, &ax25_route_fops);
2011 proc_net_fops_create(&init_net, "ax25", S_IRUGO, &ax25_info_fops);
2012 proc_net_fops_create(&init_net, "ax25_calls", S_IRUGO, &ax25_uid_fops);
2013 out:
2014 return rc;
2015 }
2016 module_init(ax25_init);
2017
2018
2019 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
2020 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
2021 MODULE_LICENSE("GPL");
2022 MODULE_ALIAS_NETPROTO(PF_AX25);
2023
2024 static void __exit ax25_exit(void)
2025 {
2026 proc_net_remove(&init_net, "ax25_route");
2027 proc_net_remove(&init_net, "ax25");
2028 proc_net_remove(&init_net, "ax25_calls");
2029 ax25_rt_free();
2030 ax25_uid_free();
2031 ax25_dev_free();
2032
2033 ax25_unregister_sysctl();
2034 unregister_netdevice_notifier(&ax25_dev_notifier);
2035
2036 dev_remove_pack(&ax25_packet_type);
2037
2038 sock_unregister(PF_AX25);
2039 proto_unregister(&ax25_proto);
2040 }
2041 module_exit(ax25_exit);
Support for the Chinese Samsung S3C2440 based development boards