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Linux 5.7.7
[linux/fpc-iii.git] / net / ax25 / af_ax25.c
blobfd91cd34f25e03d0178cbe66568ed392a7013f4e
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
5 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
6 * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
7 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
8 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
9 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
10 * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl)
11 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
12 */
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/socket.h>
18 #include <linux/in.h>
19 #include <linux/kernel.h>
20 #include <linux/sched/signal.h>
21 #include <linux/timer.h>
22 #include <linux/string.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/slab.h>
26 #include <net/ax25.h>
27 #include <linux/inet.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/skbuff.h>
31 #include <net/sock.h>
32 #include <linux/uaccess.h>
33 #include <linux/fcntl.h>
34 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/notifier.h>
38 #include <linux/proc_fs.h>
39 #include <linux/stat.h>
40 #include <linux/sysctl.h>
41 #include <linux/init.h>
42 #include <linux/spinlock.h>
43 #include <net/net_namespace.h>
44 #include <net/tcp_states.h>
45 #include <net/ip.h>
46 #include <net/arp.h>
47
48
49
50 HLIST_HEAD(ax25_list);
51 DEFINE_SPINLOCK(ax25_list_lock);
52
53 static const struct proto_ops ax25_proto_ops;
54
55 static void ax25_free_sock(struct sock *sk)
56 {
57 ax25_cb_put(sk_to_ax25(sk));
58 }
59
60 /*
61 * Socket removal during an interrupt is now safe.
62 */
63 static void ax25_cb_del(ax25_cb *ax25)
64 {
65 if (!hlist_unhashed(&ax25->ax25_node)) {
66 spin_lock_bh(&ax25_list_lock);
67 hlist_del_init(&ax25->ax25_node);
68 spin_unlock_bh(&ax25_list_lock);
69 ax25_cb_put(ax25);
70 }
71 }
72
73 /*
74 * Kill all bound sockets on a dropped device.
75 */
76 static void ax25_kill_by_device(struct net_device *dev)
77 {
78 ax25_dev *ax25_dev;
79 ax25_cb *s;
80
81 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
82 return;
83
84 spin_lock_bh(&ax25_list_lock);
85 again:
86 ax25_for_each(s, &ax25_list) {
87 if (s->ax25_dev == ax25_dev) {
88 s->ax25_dev = NULL;
89 spin_unlock_bh(&ax25_list_lock);
90 ax25_disconnect(s, ENETUNREACH);
91 spin_lock_bh(&ax25_list_lock);
92
93 /* The entry could have been deleted from the
94 * list meanwhile and thus the next pointer is
95 * no longer valid. Play it safe and restart
96 * the scan. Forward progress is ensured
97 * because we set s->ax25_dev to NULL and we
98 * are never passed a NULL 'dev' argument.
99 */
100 goto again;
101 }
102 }
103 spin_unlock_bh(&ax25_list_lock);
104 }
105
106 /*
107 * Handle device status changes.
108 */
109 static int ax25_device_event(struct notifier_block *this, unsigned long event,
110 void *ptr)
111 {
112 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
113
114 if (!net_eq(dev_net(dev), &init_net))
115 return NOTIFY_DONE;
116
117 /* Reject non AX.25 devices */
118 if (dev->type != ARPHRD_AX25)
119 return NOTIFY_DONE;
120
121 switch (event) {
122 case NETDEV_UP:
123 ax25_dev_device_up(dev);
124 break;
125 case NETDEV_DOWN:
126 ax25_kill_by_device(dev);
127 ax25_rt_device_down(dev);
128 ax25_dev_device_down(dev);
129 break;
130 default:
131 break;
132 }
133
134 return NOTIFY_DONE;
135 }
136
137 /*
138 * Add a socket to the bound sockets list.
139 */
140 void ax25_cb_add(ax25_cb *ax25)
141 {
142 spin_lock_bh(&ax25_list_lock);
143 ax25_cb_hold(ax25);
144 hlist_add_head(&ax25->ax25_node, &ax25_list);
145 spin_unlock_bh(&ax25_list_lock);
146 }
147
148 /*
149 * Find a socket that wants to accept the SABM we have just
150 * received.
151 */
152 struct sock *ax25_find_listener(ax25_address *addr, int digi,
153 struct net_device *dev, int type)
154 {
155 ax25_cb *s;
156
157 spin_lock(&ax25_list_lock);
158 ax25_for_each(s, &ax25_list) {
159 if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
160 continue;
161 if (s->sk && !ax25cmp(&s->source_addr, addr) &&
162 s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
163 /* If device is null we match any device */
164 if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
165 sock_hold(s->sk);
166 spin_unlock(&ax25_list_lock);
167 return s->sk;
168 }
169 }
170 }
171 spin_unlock(&ax25_list_lock);
172
173 return NULL;
174 }
175
176 /*
177 * Find an AX.25 socket given both ends.
178 */
179 struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
180 int type)
181 {
182 struct sock *sk = NULL;
183 ax25_cb *s;
184
185 spin_lock(&ax25_list_lock);
186 ax25_for_each(s, &ax25_list) {
187 if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
188 !ax25cmp(&s->dest_addr, dest_addr) &&
189 s->sk->sk_type == type) {
190 sk = s->sk;
191 sock_hold(sk);
192 break;
193 }
194 }
195
196 spin_unlock(&ax25_list_lock);
197
198 return sk;
199 }
200
201 /*
202 * Find an AX.25 control block given both ends. It will only pick up
203 * floating AX.25 control blocks or non Raw socket bound control blocks.
204 */
205 ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
206 ax25_digi *digi, struct net_device *dev)
207 {
208 ax25_cb *s;
209
210 spin_lock_bh(&ax25_list_lock);
211 ax25_for_each(s, &ax25_list) {
212 if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
213 continue;
214 if (s->ax25_dev == NULL)
215 continue;
216 if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
217 if (digi != NULL && digi->ndigi != 0) {
218 if (s->digipeat == NULL)
219 continue;
220 if (ax25digicmp(s->digipeat, digi) != 0)
221 continue;
222 } else {
223 if (s->digipeat != NULL && s->digipeat->ndigi != 0)
224 continue;
225 }
226 ax25_cb_hold(s);
227 spin_unlock_bh(&ax25_list_lock);
228
229 return s;
230 }
231 }
232 spin_unlock_bh(&ax25_list_lock);
233
234 return NULL;
235 }
236
237 EXPORT_SYMBOL(ax25_find_cb);
238
239 void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
240 {
241 ax25_cb *s;
242 struct sk_buff *copy;
243
244 spin_lock(&ax25_list_lock);
245 ax25_for_each(s, &ax25_list) {
246 if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
247 s->sk->sk_type == SOCK_RAW &&
248 s->sk->sk_protocol == proto &&
249 s->ax25_dev->dev == skb->dev &&
250 atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
251 if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
252 continue;
253 if (sock_queue_rcv_skb(s->sk, copy) != 0)
254 kfree_skb(copy);
255 }
256 }
257 spin_unlock(&ax25_list_lock);
258 }
259
260 /*
261 * Deferred destroy.
262 */
263 void ax25_destroy_socket(ax25_cb *);
264
265 /*
266 * Handler for deferred kills.
267 */
268 static void ax25_destroy_timer(struct timer_list *t)
269 {
270 ax25_cb *ax25 = from_timer(ax25, t, dtimer);
271 struct sock *sk;
272
273 sk=ax25->sk;
274
275 bh_lock_sock(sk);
276 sock_hold(sk);
277 ax25_destroy_socket(ax25);
278 bh_unlock_sock(sk);
279 sock_put(sk);
280 }
281
282 /*
283 * This is called from user mode and the timers. Thus it protects itself
284 * against interrupt users but doesn't worry about being called during
285 * work. Once it is removed from the queue no interrupt or bottom half
286 * will touch it and we are (fairly 8-) ) safe.
287 */
288 void ax25_destroy_socket(ax25_cb *ax25)
289 {
290 struct sk_buff *skb;
291
292 ax25_cb_del(ax25);
293
294 ax25_stop_heartbeat(ax25);
295 ax25_stop_t1timer(ax25);
296 ax25_stop_t2timer(ax25);
297 ax25_stop_t3timer(ax25);
298 ax25_stop_idletimer(ax25);
299
300 ax25_clear_queues(ax25); /* Flush the queues */
301
302 if (ax25->sk != NULL) {
303 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
304 if (skb->sk != ax25->sk) {
305 /* A pending connection */
306 ax25_cb *sax25 = sk_to_ax25(skb->sk);
307
308 /* Queue the unaccepted socket for death */
309 sock_orphan(skb->sk);
310
311 /* 9A4GL: hack to release unaccepted sockets */
312 skb->sk->sk_state = TCP_LISTEN;
313
314 ax25_start_heartbeat(sax25);
315 sax25->state = AX25_STATE_0;
316 }
317
318 kfree_skb(skb);
319 }
320 skb_queue_purge(&ax25->sk->sk_write_queue);
321 }
322
323 if (ax25->sk != NULL) {
324 if (sk_has_allocations(ax25->sk)) {
325 /* Defer: outstanding buffers */
326 timer_setup(&ax25->dtimer, ax25_destroy_timer, 0);
327 ax25->dtimer.expires = jiffies + 2 * HZ;
328 add_timer(&ax25->dtimer);
329 } else {
330 struct sock *sk=ax25->sk;
331 ax25->sk=NULL;
332 sock_put(sk);
333 }
334 } else {
335 ax25_cb_put(ax25);
336 }
337 }
338
339 /*
340 * dl1bke 960311: set parameters for existing AX.25 connections,
341 * includes a KILL command to abort any connection.
342 * VERY useful for debugging ;-)
343 */
344 static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
345 {
346 struct ax25_ctl_struct ax25_ctl;
347 ax25_digi digi;
348 ax25_dev *ax25_dev;
349 ax25_cb *ax25;
350 unsigned int k;
351 int ret = 0;
352
353 if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
354 return -EFAULT;
355
356 if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
357 return -ENODEV;
358
359 if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
360 return -EINVAL;
361
362 if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
363 return -EINVAL;
364
365 digi.ndigi = ax25_ctl.digi_count;
366 for (k = 0; k < digi.ndigi; k++)
367 digi.calls[k] = ax25_ctl.digi_addr[k];
368
369 if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
370 return -ENOTCONN;
371
372 switch (ax25_ctl.cmd) {
373 case AX25_KILL:
374 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
375 #ifdef CONFIG_AX25_DAMA_SLAVE
376 if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
377 ax25_dama_off(ax25);
378 #endif
379 ax25_disconnect(ax25, ENETRESET);
380 break;
381
382 case AX25_WINDOW:
383 if (ax25->modulus == AX25_MODULUS) {
384 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
385 goto einval_put;
386 } else {
387 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
388 goto einval_put;
389 }
390 ax25->window = ax25_ctl.arg;
391 break;
392
393 case AX25_T1:
394 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
395 goto einval_put;
396 ax25->rtt = (ax25_ctl.arg * HZ) / 2;
397 ax25->t1 = ax25_ctl.arg * HZ;
398 break;
399
400 case AX25_T2:
401 if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
402 goto einval_put;
403 ax25->t2 = ax25_ctl.arg * HZ;
404 break;
405
406 case AX25_N2:
407 if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
408 goto einval_put;
409 ax25->n2count = 0;
410 ax25->n2 = ax25_ctl.arg;
411 break;
412
413 case AX25_T3:
414 if (ax25_ctl.arg > ULONG_MAX / HZ)
415 goto einval_put;
416 ax25->t3 = ax25_ctl.arg * HZ;
417 break;
418
419 case AX25_IDLE:
420 if (ax25_ctl.arg > ULONG_MAX / (60 * HZ))
421 goto einval_put;
422
423 ax25->idle = ax25_ctl.arg * 60 * HZ;
424 break;
425
426 case AX25_PACLEN:
427 if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
428 goto einval_put;
429 ax25->paclen = ax25_ctl.arg;
430 break;
431
432 default:
433 goto einval_put;
434 }
435
436 out_put:
437 ax25_cb_put(ax25);
438 return ret;
439
440 einval_put:
441 ret = -EINVAL;
442 goto out_put;
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 refcount_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, unsigned int optlen)
532 {
533 struct sock *sk = sock->sk;
534 ax25_cb *ax25;
535 struct net_device *dev;
536 char devname[IFNAMSIZ];
537 unsigned long opt;
538 int res = 0;
539
540 if (level != SOL_AX25)
541 return -ENOPROTOOPT;
542
543 if (optlen < sizeof(unsigned int))
544 return -EINVAL;
545
546 if (get_user(opt, (unsigned int __user *)optval))
547 return -EFAULT;
548
549 lock_sock(sk);
550 ax25 = sk_to_ax25(sk);
551
552 switch (optname) {
553 case AX25_WINDOW:
554 if (ax25->modulus == AX25_MODULUS) {
555 if (opt < 1 || opt > 7) {
556 res = -EINVAL;
557 break;
558 }
559 } else {
560 if (opt < 1 || opt > 63) {
561 res = -EINVAL;
562 break;
563 }
564 }
565 ax25->window = opt;
566 break;
567
568 case AX25_T1:
569 if (opt < 1 || opt > ULONG_MAX / HZ) {
570 res = -EINVAL;
571 break;
572 }
573 ax25->rtt = (opt * HZ) >> 1;
574 ax25->t1 = opt * HZ;
575 break;
576
577 case AX25_T2:
578 if (opt < 1 || opt > ULONG_MAX / HZ) {
579 res = -EINVAL;
580 break;
581 }
582 ax25->t2 = opt * HZ;
583 break;
584
585 case AX25_N2:
586 if (opt < 1 || opt > 31) {
587 res = -EINVAL;
588 break;
589 }
590 ax25->n2 = opt;
591 break;
592
593 case AX25_T3:
594 if (opt < 1 || opt > ULONG_MAX / HZ) {
595 res = -EINVAL;
596 break;
597 }
598 ax25->t3 = opt * HZ;
599 break;
600
601 case AX25_IDLE:
602 if (opt > ULONG_MAX / (60 * HZ)) {
603 res = -EINVAL;
604 break;
605 }
606 ax25->idle = opt * 60 * HZ;
607 break;
608
609 case AX25_BACKOFF:
610 if (opt > 2) {
611 res = -EINVAL;
612 break;
613 }
614 ax25->backoff = opt;
615 break;
616
617 case AX25_EXTSEQ:
618 ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
619 break;
620
621 case AX25_PIDINCL:
622 ax25->pidincl = opt ? 1 : 0;
623 break;
624
625 case AX25_IAMDIGI:
626 ax25->iamdigi = opt ? 1 : 0;
627 break;
628
629 case AX25_PACLEN:
630 if (opt < 16 || opt > 65535) {
631 res = -EINVAL;
632 break;
633 }
634 ax25->paclen = opt;
635 break;
636
637 case SO_BINDTODEVICE:
638 if (optlen > IFNAMSIZ - 1)
639 optlen = IFNAMSIZ - 1;
640
641 memset(devname, 0, sizeof(devname));
642
643 if (copy_from_user(devname, optval, optlen)) {
644 res = -EFAULT;
645 break;
646 }
647
648 if (sk->sk_type == SOCK_SEQPACKET &&
649 (sock->state != SS_UNCONNECTED ||
650 sk->sk_state == TCP_LISTEN)) {
651 res = -EADDRNOTAVAIL;
652 break;
653 }
654
655 rtnl_lock();
656 dev = __dev_get_by_name(&init_net, devname);
657 if (!dev) {
658 rtnl_unlock();
659 res = -ENODEV;
660 break;
661 }
662
663 ax25->ax25_dev = ax25_dev_ax25dev(dev);
664 if (!ax25->ax25_dev) {
665 rtnl_unlock();
666 res = -ENODEV;
667 break;
668 }
669 ax25_fillin_cb(ax25, ax25->ax25_dev);
670 rtnl_unlock();
671 break;
672
673 default:
674 res = -ENOPROTOOPT;
675 }
676 release_sock(sk);
677
678 return res;
679 }
680
681 static int ax25_getsockopt(struct socket *sock, int level, int optname,
682 char __user *optval, int __user *optlen)
683 {
684 struct sock *sk = sock->sk;
685 ax25_cb *ax25;
686 struct ax25_dev *ax25_dev;
687 char devname[IFNAMSIZ];
688 void *valptr;
689 int val = 0;
690 int maxlen, length;
691
692 if (level != SOL_AX25)
693 return -ENOPROTOOPT;
694
695 if (get_user(maxlen, optlen))
696 return -EFAULT;
697
698 if (maxlen < 1)
699 return -EFAULT;
700
701 valptr = (void *) &val;
702 length = min_t(unsigned int, maxlen, sizeof(int));
703
704 lock_sock(sk);
705 ax25 = sk_to_ax25(sk);
706
707 switch (optname) {
708 case AX25_WINDOW:
709 val = ax25->window;
710 break;
711
712 case AX25_T1:
713 val = ax25->t1 / HZ;
714 break;
715
716 case AX25_T2:
717 val = ax25->t2 / HZ;
718 break;
719
720 case AX25_N2:
721 val = ax25->n2;
722 break;
723
724 case AX25_T3:
725 val = ax25->t3 / HZ;
726 break;
727
728 case AX25_IDLE:
729 val = ax25->idle / (60 * HZ);
730 break;
731
732 case AX25_BACKOFF:
733 val = ax25->backoff;
734 break;
735
736 case AX25_EXTSEQ:
737 val = (ax25->modulus == AX25_EMODULUS);
738 break;
739
740 case AX25_PIDINCL:
741 val = ax25->pidincl;
742 break;
743
744 case AX25_IAMDIGI:
745 val = ax25->iamdigi;
746 break;
747
748 case AX25_PACLEN:
749 val = ax25->paclen;
750 break;
751
752 case SO_BINDTODEVICE:
753 ax25_dev = ax25->ax25_dev;
754
755 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
756 strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
757 length = strlen(devname) + 1;
758 } else {
759 *devname = '\0';
760 length = 1;
761 }
762
763 valptr = (void *) devname;
764 break;
765
766 default:
767 release_sock(sk);
768 return -ENOPROTOOPT;
769 }
770 release_sock(sk);
771
772 if (put_user(length, optlen))
773 return -EFAULT;
774
775 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
776 }
777
778 static int ax25_listen(struct socket *sock, int backlog)
779 {
780 struct sock *sk = sock->sk;
781 int res = 0;
782
783 lock_sock(sk);
784 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
785 sk->sk_max_ack_backlog = backlog;
786 sk->sk_state = TCP_LISTEN;
787 goto out;
788 }
789 res = -EOPNOTSUPP;
790
791 out:
792 release_sock(sk);
793
794 return res;
795 }
796
797 /*
798 * XXX: when creating ax25_sock we should update the .obj_size setting
799 * below.
800 */
801 static struct proto ax25_proto = {
802 .name = "AX25",
803 .owner = THIS_MODULE,
804 .obj_size = sizeof(struct ax25_sock),
805 };
806
807 static int ax25_create(struct net *net, struct socket *sock, int protocol,
808 int kern)
809 {
810 struct sock *sk;
811 ax25_cb *ax25;
812
813 if (protocol < 0 || protocol > U8_MAX)
814 return -EINVAL;
815
816 if (!net_eq(net, &init_net))
817 return -EAFNOSUPPORT;
818
819 switch (sock->type) {
820 case SOCK_DGRAM:
821 if (protocol == 0 || protocol == PF_AX25)
822 protocol = AX25_P_TEXT;
823 break;
824
825 case SOCK_SEQPACKET:
826 switch (protocol) {
827 case 0:
828 case PF_AX25: /* For CLX */
829 protocol = AX25_P_TEXT;
830 break;
831 case AX25_P_SEGMENT:
832 #ifdef CONFIG_INET
833 case AX25_P_ARP:
834 case AX25_P_IP:
835 #endif
836 #ifdef CONFIG_NETROM
837 case AX25_P_NETROM:
838 #endif
839 #ifdef CONFIG_ROSE
840 case AX25_P_ROSE:
841 #endif
842 return -ESOCKTNOSUPPORT;
843 #ifdef CONFIG_NETROM_MODULE
844 case AX25_P_NETROM:
845 if (ax25_protocol_is_registered(AX25_P_NETROM))
846 return -ESOCKTNOSUPPORT;
847 break;
848 #endif
849 #ifdef CONFIG_ROSE_MODULE
850 case AX25_P_ROSE:
851 if (ax25_protocol_is_registered(AX25_P_ROSE))
852 return -ESOCKTNOSUPPORT;
853 #endif
854 default:
855 break;
856 }
857 break;
858
859 case SOCK_RAW:
860 if (!capable(CAP_NET_RAW))
861 return -EPERM;
862 break;
863 default:
864 return -ESOCKTNOSUPPORT;
865 }
866
867 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
868 if (sk == NULL)
869 return -ENOMEM;
870
871 ax25 = ax25_sk(sk)->cb = ax25_create_cb();
872 if (!ax25) {
873 sk_free(sk);
874 return -ENOMEM;
875 }
876
877 sock_init_data(sock, sk);
878
879 sk->sk_destruct = ax25_free_sock;
880 sock->ops = &ax25_proto_ops;
881 sk->sk_protocol = protocol;
882
883 ax25->sk = sk;
884
885 return 0;
886 }
887
888 struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
889 {
890 struct sock *sk;
891 ax25_cb *ax25, *oax25;
892
893 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
894 if (sk == NULL)
895 return NULL;
896
897 if ((ax25 = ax25_create_cb()) == NULL) {
898 sk_free(sk);
899 return NULL;
900 }
901
902 switch (osk->sk_type) {
903 case SOCK_DGRAM:
904 break;
905 case SOCK_SEQPACKET:
906 break;
907 default:
908 sk_free(sk);
909 ax25_cb_put(ax25);
910 return NULL;
911 }
912
913 sock_init_data(NULL, sk);
914
915 sk->sk_type = osk->sk_type;
916 sk->sk_priority = osk->sk_priority;
917 sk->sk_protocol = osk->sk_protocol;
918 sk->sk_rcvbuf = osk->sk_rcvbuf;
919 sk->sk_sndbuf = osk->sk_sndbuf;
920 sk->sk_state = TCP_ESTABLISHED;
921 sock_copy_flags(sk, osk);
922
923 oax25 = sk_to_ax25(osk);
924
925 ax25->modulus = oax25->modulus;
926 ax25->backoff = oax25->backoff;
927 ax25->pidincl = oax25->pidincl;
928 ax25->iamdigi = oax25->iamdigi;
929 ax25->rtt = oax25->rtt;
930 ax25->t1 = oax25->t1;
931 ax25->t2 = oax25->t2;
932 ax25->t3 = oax25->t3;
933 ax25->n2 = oax25->n2;
934 ax25->idle = oax25->idle;
935 ax25->paclen = oax25->paclen;
936 ax25->window = oax25->window;
937
938 ax25->ax25_dev = ax25_dev;
939 ax25->source_addr = oax25->source_addr;
940
941 if (oax25->digipeat != NULL) {
942 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
943 GFP_ATOMIC);
944 if (ax25->digipeat == NULL) {
945 sk_free(sk);
946 ax25_cb_put(ax25);
947 return NULL;
948 }
949 }
950
951 ax25_sk(sk)->cb = ax25;
952 sk->sk_destruct = ax25_free_sock;
953 ax25->sk = sk;
954
955 return sk;
956 }
957
958 static int ax25_release(struct socket *sock)
959 {
960 struct sock *sk = sock->sk;
961 ax25_cb *ax25;
962
963 if (sk == NULL)
964 return 0;
965
966 sock_hold(sk);
967 sock_orphan(sk);
968 lock_sock(sk);
969 ax25 = sk_to_ax25(sk);
970
971 if (sk->sk_type == SOCK_SEQPACKET) {
972 switch (ax25->state) {
973 case AX25_STATE_0:
974 release_sock(sk);
975 ax25_disconnect(ax25, 0);
976 lock_sock(sk);
977 ax25_destroy_socket(ax25);
978 break;
979
980 case AX25_STATE_1:
981 case AX25_STATE_2:
982 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
983 release_sock(sk);
984 ax25_disconnect(ax25, 0);
985 lock_sock(sk);
986 if (!sock_flag(ax25->sk, SOCK_DESTROY))
987 ax25_destroy_socket(ax25);
988 break;
989
990 case AX25_STATE_3:
991 case AX25_STATE_4:
992 ax25_clear_queues(ax25);
993 ax25->n2count = 0;
994
995 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
996 case AX25_PROTO_STD_SIMPLEX:
997 case AX25_PROTO_STD_DUPLEX:
998 ax25_send_control(ax25,
999 AX25_DISC,
1000 AX25_POLLON,
1001 AX25_COMMAND);
1002 ax25_stop_t2timer(ax25);
1003 ax25_stop_t3timer(ax25);
1004 ax25_stop_idletimer(ax25);
1005 break;
1006 #ifdef CONFIG_AX25_DAMA_SLAVE
1007 case AX25_PROTO_DAMA_SLAVE:
1008 ax25_stop_t3timer(ax25);
1009 ax25_stop_idletimer(ax25);
1010 break;
1011 #endif
1012 }
1013 ax25_calculate_t1(ax25);
1014 ax25_start_t1timer(ax25);
1015 ax25->state = AX25_STATE_2;
1016 sk->sk_state = TCP_CLOSE;
1017 sk->sk_shutdown |= SEND_SHUTDOWN;
1018 sk->sk_state_change(sk);
1019 sock_set_flag(sk, SOCK_DESTROY);
1020 break;
1021
1022 default:
1023 break;
1024 }
1025 } else {
1026 sk->sk_state = TCP_CLOSE;
1027 sk->sk_shutdown |= SEND_SHUTDOWN;
1028 sk->sk_state_change(sk);
1029 ax25_destroy_socket(ax25);
1030 }
1031
1032 sock->sk = NULL;
1033 release_sock(sk);
1034 sock_put(sk);
1035
1036 return 0;
1037 }
1038
1039 /*
1040 * We support a funny extension here so you can (as root) give any callsign
1041 * digipeated via a local address as source. This hack is obsolete now
1042 * that we've implemented support for SO_BINDTODEVICE. It is however small
1043 * and trivially backward compatible.
1044 */
1045 static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1046 {
1047 struct sock *sk = sock->sk;
1048 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1049 ax25_dev *ax25_dev = NULL;
1050 ax25_uid_assoc *user;
1051 ax25_address call;
1052 ax25_cb *ax25;
1053 int err = 0;
1054
1055 if (addr_len != sizeof(struct sockaddr_ax25) &&
1056 addr_len != sizeof(struct full_sockaddr_ax25))
1057 /* support for old structure may go away some time
1058 * ax25_bind(): uses old (6 digipeater) socket structure.
1059 */
1060 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1061 (addr_len > sizeof(struct full_sockaddr_ax25)))
1062 return -EINVAL;
1063
1064 if (addr->fsa_ax25.sax25_family != AF_AX25)
1065 return -EINVAL;
1066
1067 user = ax25_findbyuid(current_euid());
1068 if (user) {
1069 call = user->call;
1070 ax25_uid_put(user);
1071 } else {
1072 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1073 return -EACCES;
1074
1075 call = addr->fsa_ax25.sax25_call;
1076 }
1077
1078 lock_sock(sk);
1079
1080 ax25 = sk_to_ax25(sk);
1081 if (!sock_flag(sk, SOCK_ZAPPED)) {
1082 err = -EINVAL;
1083 goto out;
1084 }
1085
1086 ax25->source_addr = call;
1087
1088 /*
1089 * User already set interface with SO_BINDTODEVICE
1090 */
1091 if (ax25->ax25_dev != NULL)
1092 goto done;
1093
1094 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1095 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1096 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1097 err = -EADDRNOTAVAIL;
1098 goto out;
1099 }
1100 } else {
1101 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1102 err = -EADDRNOTAVAIL;
1103 goto out;
1104 }
1105 }
1106
1107 if (ax25_dev != NULL)
1108 ax25_fillin_cb(ax25, ax25_dev);
1109
1110 done:
1111 ax25_cb_add(ax25);
1112 sock_reset_flag(sk, SOCK_ZAPPED);
1113
1114 out:
1115 release_sock(sk);
1116
1117 return err;
1118 }
1119
1120 /*
1121 * FIXME: nonblock behaviour looks like it may have a bug.
1122 */
1123 static int __must_check ax25_connect(struct socket *sock,
1124 struct sockaddr *uaddr, int addr_len, int flags)
1125 {
1126 struct sock *sk = sock->sk;
1127 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
1128 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1129 ax25_digi *digi = NULL;
1130 int ct = 0, err = 0;
1131
1132 /*
1133 * some sanity checks. code further down depends on this
1134 */
1135
1136 if (addr_len == sizeof(struct sockaddr_ax25))
1137 /* support for this will go away in early 2.5.x
1138 * ax25_connect(): uses obsolete socket structure
1139 */
1140 ;
1141 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1142 /* support for old structure may go away some time
1143 * ax25_connect(): uses old (6 digipeater) socket structure.
1144 */
1145 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1146 (addr_len > sizeof(struct full_sockaddr_ax25)))
1147 return -EINVAL;
1148
1149
1150 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1151 return -EINVAL;
1152
1153 lock_sock(sk);
1154
1155 /* deal with restarts */
1156 if (sock->state == SS_CONNECTING) {
1157 switch (sk->sk_state) {
1158 case TCP_SYN_SENT: /* still trying */
1159 err = -EINPROGRESS;
1160 goto out_release;
1161
1162 case TCP_ESTABLISHED: /* connection established */
1163 sock->state = SS_CONNECTED;
1164 goto out_release;
1165
1166 case TCP_CLOSE: /* connection refused */
1167 sock->state = SS_UNCONNECTED;
1168 err = -ECONNREFUSED;
1169 goto out_release;
1170 }
1171 }
1172
1173 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1174 err = -EISCONN; /* No reconnect on a seqpacket socket */
1175 goto out_release;
1176 }
1177
1178 sk->sk_state = TCP_CLOSE;
1179 sock->state = SS_UNCONNECTED;
1180
1181 kfree(ax25->digipeat);
1182 ax25->digipeat = NULL;
1183
1184 /*
1185 * Handle digi-peaters to be used.
1186 */
1187 if (addr_len > sizeof(struct sockaddr_ax25) &&
1188 fsa->fsa_ax25.sax25_ndigis != 0) {
1189 /* Valid number of digipeaters ? */
1190 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1191 err = -EINVAL;
1192 goto out_release;
1193 }
1194
1195 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1196 err = -ENOBUFS;
1197 goto out_release;
1198 }
1199
1200 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1201 digi->lastrepeat = -1;
1202
1203 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1204 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1205 AX25_HBIT) && ax25->iamdigi) {
1206 digi->repeated[ct] = 1;
1207 digi->lastrepeat = ct;
1208 } else {
1209 digi->repeated[ct] = 0;
1210 }
1211 digi->calls[ct] = fsa->fsa_digipeater[ct];
1212 ct++;
1213 }
1214 }
1215
1216 /*
1217 * Must bind first - autobinding in this may or may not work. If
1218 * the socket is already bound, check to see if the device has
1219 * been filled in, error if it hasn't.
1220 */
1221 if (sock_flag(sk, SOCK_ZAPPED)) {
1222 /* check if we can remove this feature. It is broken. */
1223 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1224 current->comm);
1225 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1226 kfree(digi);
1227 goto out_release;
1228 }
1229
1230 ax25_fillin_cb(ax25, ax25->ax25_dev);
1231 ax25_cb_add(ax25);
1232 } else {
1233 if (ax25->ax25_dev == NULL) {
1234 kfree(digi);
1235 err = -EHOSTUNREACH;
1236 goto out_release;
1237 }
1238 }
1239
1240 if (sk->sk_type == SOCK_SEQPACKET &&
1241 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1242 ax25->ax25_dev->dev))) {
1243 kfree(digi);
1244 err = -EADDRINUSE; /* Already such a connection */
1245 ax25_cb_put(ax25t);
1246 goto out_release;
1247 }
1248
1249 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1250 ax25->digipeat = digi;
1251
1252 /* First the easy one */
1253 if (sk->sk_type != SOCK_SEQPACKET) {
1254 sock->state = SS_CONNECTED;
1255 sk->sk_state = TCP_ESTABLISHED;
1256 goto out_release;
1257 }
1258
1259 /* Move to connecting socket, ax.25 lapb WAIT_UA.. */
1260 sock->state = SS_CONNECTING;
1261 sk->sk_state = TCP_SYN_SENT;
1262
1263 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1264 case AX25_PROTO_STD_SIMPLEX:
1265 case AX25_PROTO_STD_DUPLEX:
1266 ax25_std_establish_data_link(ax25);
1267 break;
1268
1269 #ifdef CONFIG_AX25_DAMA_SLAVE
1270 case AX25_PROTO_DAMA_SLAVE:
1271 ax25->modulus = AX25_MODULUS;
1272 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1273 if (ax25->ax25_dev->dama.slave)
1274 ax25_ds_establish_data_link(ax25);
1275 else
1276 ax25_std_establish_data_link(ax25);
1277 break;
1278 #endif
1279 }
1280
1281 ax25->state = AX25_STATE_1;
1282
1283 ax25_start_heartbeat(ax25);
1284
1285 /* Now the loop */
1286 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1287 err = -EINPROGRESS;
1288 goto out_release;
1289 }
1290
1291 if (sk->sk_state == TCP_SYN_SENT) {
1292 DEFINE_WAIT(wait);
1293
1294 for (;;) {
1295 prepare_to_wait(sk_sleep(sk), &wait,
1296 TASK_INTERRUPTIBLE);
1297 if (sk->sk_state != TCP_SYN_SENT)
1298 break;
1299 if (!signal_pending(current)) {
1300 release_sock(sk);
1301 schedule();
1302 lock_sock(sk);
1303 continue;
1304 }
1305 err = -ERESTARTSYS;
1306 break;
1307 }
1308 finish_wait(sk_sleep(sk), &wait);
1309
1310 if (err)
1311 goto out_release;
1312 }
1313
1314 if (sk->sk_state != TCP_ESTABLISHED) {
1315 /* Not in ABM, not in WAIT_UA -> failed */
1316 sock->state = SS_UNCONNECTED;
1317 err = sock_error(sk); /* Always set at this point */
1318 goto out_release;
1319 }
1320
1321 sock->state = SS_CONNECTED;
1322
1323 err = 0;
1324 out_release:
1325 release_sock(sk);
1326
1327 return err;
1328 }
1329
1330 static int ax25_accept(struct socket *sock, struct socket *newsock, int flags,
1331 bool kern)
1332 {
1333 struct sk_buff *skb;
1334 struct sock *newsk;
1335 DEFINE_WAIT(wait);
1336 struct sock *sk;
1337 int err = 0;
1338
1339 if (sock->state != SS_UNCONNECTED)
1340 return -EINVAL;
1341
1342 if ((sk = sock->sk) == NULL)
1343 return -EINVAL;
1344
1345 lock_sock(sk);
1346 if (sk->sk_type != SOCK_SEQPACKET) {
1347 err = -EOPNOTSUPP;
1348 goto out;
1349 }
1350
1351 if (sk->sk_state != TCP_LISTEN) {
1352 err = -EINVAL;
1353 goto out;
1354 }
1355
1356 /*
1357 * The read queue this time is holding sockets ready to use
1358 * hooked into the SABM we saved
1359 */
1360 for (;;) {
1361 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1362 skb = skb_dequeue(&sk->sk_receive_queue);
1363 if (skb)
1364 break;
1365
1366 if (flags & O_NONBLOCK) {
1367 err = -EWOULDBLOCK;
1368 break;
1369 }
1370 if (!signal_pending(current)) {
1371 release_sock(sk);
1372 schedule();
1373 lock_sock(sk);
1374 continue;
1375 }
1376 err = -ERESTARTSYS;
1377 break;
1378 }
1379 finish_wait(sk_sleep(sk), &wait);
1380
1381 if (err)
1382 goto out;
1383
1384 newsk = skb->sk;
1385 sock_graft(newsk, newsock);
1386
1387 /* Now attach up the new socket */
1388 kfree_skb(skb);
1389 sk_acceptq_removed(sk);
1390 newsock->state = SS_CONNECTED;
1391
1392 out:
1393 release_sock(sk);
1394
1395 return err;
1396 }
1397
1398 static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1399 int peer)
1400 {
1401 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1402 struct sock *sk = sock->sk;
1403 unsigned char ndigi, i;
1404 ax25_cb *ax25;
1405 int err = 0;
1406
1407 memset(fsa, 0, sizeof(*fsa));
1408 lock_sock(sk);
1409 ax25 = sk_to_ax25(sk);
1410
1411 if (peer != 0) {
1412 if (sk->sk_state != TCP_ESTABLISHED) {
1413 err = -ENOTCONN;
1414 goto out;
1415 }
1416
1417 fsa->fsa_ax25.sax25_family = AF_AX25;
1418 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1419
1420 if (ax25->digipeat != NULL) {
1421 ndigi = ax25->digipeat->ndigi;
1422 fsa->fsa_ax25.sax25_ndigis = ndigi;
1423 for (i = 0; i < ndigi; i++)
1424 fsa->fsa_digipeater[i] =
1425 ax25->digipeat->calls[i];
1426 }
1427 } else {
1428 fsa->fsa_ax25.sax25_family = AF_AX25;
1429 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1430 fsa->fsa_ax25.sax25_ndigis = 1;
1431 if (ax25->ax25_dev != NULL) {
1432 memcpy(&fsa->fsa_digipeater[0],
1433 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1434 } else {
1435 fsa->fsa_digipeater[0] = null_ax25_address;
1436 }
1437 }
1438 err = sizeof (struct full_sockaddr_ax25);
1439
1440 out:
1441 release_sock(sk);
1442
1443 return err;
1444 }
1445
1446 static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1447 {
1448 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1449 struct sock *sk = sock->sk;
1450 struct sockaddr_ax25 sax;
1451 struct sk_buff *skb;
1452 ax25_digi dtmp, *dp;
1453 ax25_cb *ax25;
1454 size_t size;
1455 int lv, err, addr_len = msg->msg_namelen;
1456
1457 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1458 return -EINVAL;
1459
1460 lock_sock(sk);
1461 ax25 = sk_to_ax25(sk);
1462
1463 if (sock_flag(sk, SOCK_ZAPPED)) {
1464 err = -EADDRNOTAVAIL;
1465 goto out;
1466 }
1467
1468 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1469 send_sig(SIGPIPE, current, 0);
1470 err = -EPIPE;
1471 goto out;
1472 }
1473
1474 if (ax25->ax25_dev == NULL) {
1475 err = -ENETUNREACH;
1476 goto out;
1477 }
1478
1479 if (len > ax25->ax25_dev->dev->mtu) {
1480 err = -EMSGSIZE;
1481 goto out;
1482 }
1483
1484 if (usax != NULL) {
1485 if (usax->sax25_family != AF_AX25) {
1486 err = -EINVAL;
1487 goto out;
1488 }
1489
1490 if (addr_len == sizeof(struct sockaddr_ax25))
1491 /* ax25_sendmsg(): uses obsolete socket structure */
1492 ;
1493 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1494 /* support for old structure may go away some time
1495 * ax25_sendmsg(): uses old (6 digipeater)
1496 * socket structure.
1497 */
1498 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1499 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1500 err = -EINVAL;
1501 goto out;
1502 }
1503
1504
1505 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1506 int ct = 0;
1507 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1508
1509 /* Valid number of digipeaters ? */
1510 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1511 err = -EINVAL;
1512 goto out;
1513 }
1514
1515 dtmp.ndigi = usax->sax25_ndigis;
1516
1517 while (ct < usax->sax25_ndigis) {
1518 dtmp.repeated[ct] = 0;
1519 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1520 ct++;
1521 }
1522
1523 dtmp.lastrepeat = 0;
1524 }
1525
1526 sax = *usax;
1527 if (sk->sk_type == SOCK_SEQPACKET &&
1528 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1529 err = -EISCONN;
1530 goto out;
1531 }
1532 if (usax->sax25_ndigis == 0)
1533 dp = NULL;
1534 else
1535 dp = &dtmp;
1536 } else {
1537 /*
1538 * FIXME: 1003.1g - if the socket is like this because
1539 * it has become closed (not started closed) and is VC
1540 * we ought to SIGPIPE, EPIPE
1541 */
1542 if (sk->sk_state != TCP_ESTABLISHED) {
1543 err = -ENOTCONN;
1544 goto out;
1545 }
1546 sax.sax25_family = AF_AX25;
1547 sax.sax25_call = ax25->dest_addr;
1548 dp = ax25->digipeat;
1549 }
1550
1551 /* Build a packet */
1552 /* Assume the worst case */
1553 size = len + ax25->ax25_dev->dev->hard_header_len;
1554
1555 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1556 if (skb == NULL)
1557 goto out;
1558
1559 skb_reserve(skb, size - len);
1560
1561 /* User data follows immediately after the AX.25 data */
1562 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1563 err = -EFAULT;
1564 kfree_skb(skb);
1565 goto out;
1566 }
1567
1568 skb_reset_network_header(skb);
1569
1570 /* Add the PID if one is not supplied by the user in the skb */
1571 if (!ax25->pidincl)
1572 *(u8 *)skb_push(skb, 1) = sk->sk_protocol;
1573
1574 if (sk->sk_type == SOCK_SEQPACKET) {
1575 /* Connected mode sockets go via the LAPB machine */
1576 if (sk->sk_state != TCP_ESTABLISHED) {
1577 kfree_skb(skb);
1578 err = -ENOTCONN;
1579 goto out;
1580 }
1581
1582 /* Shove it onto the queue and kick */
1583 ax25_output(ax25, ax25->paclen, skb);
1584
1585 err = len;
1586 goto out;
1587 }
1588
1589 skb_push(skb, 1 + ax25_addr_size(dp));
1590
1591 /* Building AX.25 Header */
1592
1593 /* Build an AX.25 header */
1594 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1595 dp, AX25_COMMAND, AX25_MODULUS);
1596
1597 skb_set_transport_header(skb, lv);
1598
1599 *skb_transport_header(skb) = AX25_UI;
1600
1601 /* Datagram frames go straight out of the door as UI */
1602 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1603
1604 err = len;
1605
1606 out:
1607 release_sock(sk);
1608
1609 return err;
1610 }
1611
1612 static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1613 int flags)
1614 {
1615 struct sock *sk = sock->sk;
1616 struct sk_buff *skb;
1617 int copied;
1618 int err = 0;
1619
1620 lock_sock(sk);
1621 /*
1622 * This works for seqpacket too. The receiver has ordered the
1623 * queue for us! We do one quick check first though
1624 */
1625 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1626 err = -ENOTCONN;
1627 goto out;
1628 }
1629
1630 /* Now we can treat all alike */
1631 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1632 flags & MSG_DONTWAIT, &err);
1633 if (skb == NULL)
1634 goto out;
1635
1636 if (!sk_to_ax25(sk)->pidincl)
1637 skb_pull(skb, 1); /* Remove PID */
1638
1639 skb_reset_transport_header(skb);
1640 copied = skb->len;
1641
1642 if (copied > size) {
1643 copied = size;
1644 msg->msg_flags |= MSG_TRUNC;
1645 }
1646
1647 skb_copy_datagram_msg(skb, 0, msg, copied);
1648
1649 if (msg->msg_name) {
1650 ax25_digi digi;
1651 ax25_address src;
1652 const unsigned char *mac = skb_mac_header(skb);
1653 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1654
1655 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1656 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1657 &digi, NULL, NULL);
1658 sax->sax25_family = AF_AX25;
1659 /* We set this correctly, even though we may not let the
1660 application know the digi calls further down (because it
1661 did NOT ask to know them). This could get political... **/
1662 sax->sax25_ndigis = digi.ndigi;
1663 sax->sax25_call = src;
1664
1665 if (sax->sax25_ndigis != 0) {
1666 int ct;
1667 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1668
1669 for (ct = 0; ct < digi.ndigi; ct++)
1670 fsa->fsa_digipeater[ct] = digi.calls[ct];
1671 }
1672 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1673 }
1674
1675 skb_free_datagram(sk, skb);
1676 err = copied;
1677
1678 out:
1679 release_sock(sk);
1680
1681 return err;
1682 }
1683
1684 static int ax25_shutdown(struct socket *sk, int how)
1685 {
1686 /* FIXME - generate DM and RNR states */
1687 return -EOPNOTSUPP;
1688 }
1689
1690 static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1691 {
1692 struct sock *sk = sock->sk;
1693 void __user *argp = (void __user *)arg;
1694 int res = 0;
1695
1696 lock_sock(sk);
1697 switch (cmd) {
1698 case TIOCOUTQ: {
1699 long amount;
1700
1701 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1702 if (amount < 0)
1703 amount = 0;
1704 res = put_user(amount, (int __user *)argp);
1705 break;
1706 }
1707
1708 case TIOCINQ: {
1709 struct sk_buff *skb;
1710 long amount = 0L;
1711 /* These two are safe on a single CPU system as only user tasks fiddle here */
1712 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1713 amount = skb->len;
1714 res = put_user(amount, (int __user *) argp);
1715 break;
1716 }
1717
1718 case SIOCAX25ADDUID: /* Add a uid to the uid/call map table */
1719 case SIOCAX25DELUID: /* Delete a uid from the uid/call map table */
1720 case SIOCAX25GETUID: {
1721 struct sockaddr_ax25 sax25;
1722 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1723 res = -EFAULT;
1724 break;
1725 }
1726 res = ax25_uid_ioctl(cmd, &sax25);
1727 break;
1728 }
1729
1730 case SIOCAX25NOUID: { /* Set the default policy (default/bar) */
1731 long amount;
1732 if (!capable(CAP_NET_ADMIN)) {
1733 res = -EPERM;
1734 break;
1735 }
1736 if (get_user(amount, (long __user *)argp)) {
1737 res = -EFAULT;
1738 break;
1739 }
1740 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1741 res = -EINVAL;
1742 break;
1743 }
1744 ax25_uid_policy = amount;
1745 res = 0;
1746 break;
1747 }
1748
1749 case SIOCADDRT:
1750 case SIOCDELRT:
1751 case SIOCAX25OPTRT:
1752 if (!capable(CAP_NET_ADMIN)) {
1753 res = -EPERM;
1754 break;
1755 }
1756 res = ax25_rt_ioctl(cmd, argp);
1757 break;
1758
1759 case SIOCAX25CTLCON:
1760 if (!capable(CAP_NET_ADMIN)) {
1761 res = -EPERM;
1762 break;
1763 }
1764 res = ax25_ctl_ioctl(cmd, argp);
1765 break;
1766
1767 case SIOCAX25GETINFO:
1768 case SIOCAX25GETINFOOLD: {
1769 ax25_cb *ax25 = sk_to_ax25(sk);
1770 struct ax25_info_struct ax25_info;
1771
1772 ax25_info.t1 = ax25->t1 / HZ;
1773 ax25_info.t2 = ax25->t2 / HZ;
1774 ax25_info.t3 = ax25->t3 / HZ;
1775 ax25_info.idle = ax25->idle / (60 * HZ);
1776 ax25_info.n2 = ax25->n2;
1777 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1778 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1779 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1780 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1781 ax25_info.n2count = ax25->n2count;
1782 ax25_info.state = ax25->state;
1783 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1784 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1785 ax25_info.vs = ax25->vs;
1786 ax25_info.vr = ax25->vr;
1787 ax25_info.va = ax25->va;
1788 ax25_info.vs_max = ax25->vs; /* reserved */
1789 ax25_info.paclen = ax25->paclen;
1790 ax25_info.window = ax25->window;
1791
1792 /* old structure? */
1793 if (cmd == SIOCAX25GETINFOOLD) {
1794 static int warned = 0;
1795 if (!warned) {
1796 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1797 current->comm);
1798 warned=1;
1799 }
1800
1801 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1802 res = -EFAULT;
1803 break;
1804 }
1805 } else {
1806 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1807 res = -EINVAL;
1808 break;
1809 }
1810 }
1811 res = 0;
1812 break;
1813 }
1814
1815 case SIOCAX25ADDFWD:
1816 case SIOCAX25DELFWD: {
1817 struct ax25_fwd_struct ax25_fwd;
1818 if (!capable(CAP_NET_ADMIN)) {
1819 res = -EPERM;
1820 break;
1821 }
1822 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1823 res = -EFAULT;
1824 break;
1825 }
1826 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1827 break;
1828 }
1829
1830 case SIOCGIFADDR:
1831 case SIOCSIFADDR:
1832 case SIOCGIFDSTADDR:
1833 case SIOCSIFDSTADDR:
1834 case SIOCGIFBRDADDR:
1835 case SIOCSIFBRDADDR:
1836 case SIOCGIFNETMASK:
1837 case SIOCSIFNETMASK:
1838 case SIOCGIFMETRIC:
1839 case SIOCSIFMETRIC:
1840 res = -EINVAL;
1841 break;
1842
1843 default:
1844 res = -ENOIOCTLCMD;
1845 break;
1846 }
1847 release_sock(sk);
1848
1849 return res;
1850 }
1851
1852 #ifdef CONFIG_PROC_FS
1853
1854 static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1855 __acquires(ax25_list_lock)
1856 {
1857 spin_lock_bh(&ax25_list_lock);
1858 return seq_hlist_start(&ax25_list, *pos);
1859 }
1860
1861 static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1862 {
1863 return seq_hlist_next(v, &ax25_list, pos);
1864 }
1865
1866 static void ax25_info_stop(struct seq_file *seq, void *v)
1867 __releases(ax25_list_lock)
1868 {
1869 spin_unlock_bh(&ax25_list_lock);
1870 }
1871
1872 static int ax25_info_show(struct seq_file *seq, void *v)
1873 {
1874 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1875 char buf[11];
1876 int k;
1877
1878
1879 /*
1880 * New format:
1881 * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode
1882 */
1883
1884 seq_printf(seq, "%p %s %s%s ",
1885 ax25,
1886 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1887 ax2asc(buf, &ax25->source_addr),
1888 ax25->iamdigi? "*":"");
1889 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1890
1891 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1892 seq_printf(seq, ",%s%s",
1893 ax2asc(buf, &ax25->digipeat->calls[k]),
1894 ax25->digipeat->repeated[k]? "*":"");
1895 }
1896
1897 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1898 ax25->state,
1899 ax25->vs, ax25->vr, ax25->va,
1900 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1901 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1902 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1903 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1904 ax25->idle / (60 * HZ),
1905 ax25->n2count, ax25->n2,
1906 ax25->rtt / HZ,
1907 ax25->window,
1908 ax25->paclen);
1909
1910 if (ax25->sk != NULL) {
1911 seq_printf(seq, " %d %d %lu\n",
1912 sk_wmem_alloc_get(ax25->sk),
1913 sk_rmem_alloc_get(ax25->sk),
1914 sock_i_ino(ax25->sk));
1915 } else {
1916 seq_puts(seq, " * * *\n");
1917 }
1918 return 0;
1919 }
1920
1921 static const struct seq_operations ax25_info_seqops = {
1922 .start = ax25_info_start,
1923 .next = ax25_info_next,
1924 .stop = ax25_info_stop,
1925 .show = ax25_info_show,
1926 };
1927 #endif
1928
1929 static const struct net_proto_family ax25_family_ops = {
1930 .family = PF_AX25,
1931 .create = ax25_create,
1932 .owner = THIS_MODULE,
1933 };
1934
1935 static const struct proto_ops ax25_proto_ops = {
1936 .family = PF_AX25,
1937 .owner = THIS_MODULE,
1938 .release = ax25_release,
1939 .bind = ax25_bind,
1940 .connect = ax25_connect,
1941 .socketpair = sock_no_socketpair,
1942 .accept = ax25_accept,
1943 .getname = ax25_getname,
1944 .poll = datagram_poll,
1945 .ioctl = ax25_ioctl,
1946 .gettstamp = sock_gettstamp,
1947 .listen = ax25_listen,
1948 .shutdown = ax25_shutdown,
1949 .setsockopt = ax25_setsockopt,
1950 .getsockopt = ax25_getsockopt,
1951 .sendmsg = ax25_sendmsg,
1952 .recvmsg = ax25_recvmsg,
1953 .mmap = sock_no_mmap,
1954 .sendpage = sock_no_sendpage,
1955 };
1956
1957 /*
1958 * Called by socket.c on kernel start up
1959 */
1960 static struct packet_type ax25_packet_type __read_mostly = {
1961 .type = cpu_to_be16(ETH_P_AX25),
1962 .func = ax25_kiss_rcv,
1963 };
1964
1965 static struct notifier_block ax25_dev_notifier = {
1966 .notifier_call = ax25_device_event,
1967 };
1968
1969 static int __init ax25_init(void)
1970 {
1971 int rc = proto_register(&ax25_proto, 0);
1972
1973 if (rc != 0)
1974 goto out;
1975
1976 sock_register(&ax25_family_ops);
1977 dev_add_pack(&ax25_packet_type);
1978 register_netdevice_notifier(&ax25_dev_notifier);
1979
1980 proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops);
1981 proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops);
1982 proc_create_seq("ax25_calls", 0444, init_net.proc_net,
1983 &ax25_uid_seqops);
1984 out:
1985 return rc;
1986 }
1987 module_init(ax25_init);
1988
1989
1990 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1991 MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
1992 MODULE_LICENSE("GPL");
1993 MODULE_ALIAS_NETPROTO(PF_AX25);
1994
1995 static void __exit ax25_exit(void)
1996 {
1997 remove_proc_entry("ax25_route", init_net.proc_net);
1998 remove_proc_entry("ax25", init_net.proc_net);
1999 remove_proc_entry("ax25_calls", init_net.proc_net);
2000
2001 unregister_netdevice_notifier(&ax25_dev_notifier);
2002
2003 dev_remove_pack(&ax25_packet_type);
2004
2005 sock_unregister(PF_AX25);
2006 proto_unregister(&ax25_proto);
2007
2008 ax25_rt_free();
2009 ax25_uid_free();
2010 ax25_dev_free();
2011 }
2012 module_exit(ax25_exit);
Linux with added FPC-III support