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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>
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
50HLIST_HEAD(ax25_list);
51DEFINE_SPINLOCK(ax25_list_lock);
52
53static const struct proto_ops ax25_proto_ops;
54
55static void ax25_free_sock(struct sock *sk)
56{
57 ax25_cb_put(sk_to_ax25(sk));
58}
59
60
61
62
63static 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
75
76static 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);
85again:
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
94
95
96
97
98
99
100 goto again;
101 }
102 }
103 spin_unlock_bh(&ax25_list_lock);
104}
105
106
107
108
109static 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
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
139
140void 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
150
151
152struct 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
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
178
179struct 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
203
204
205ax25_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
237EXPORT_SYMBOL(ax25_find_cb);
238
239void 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
262
263void ax25_destroy_socket(ax25_cb *);
264
265
266
267
268static 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
284
285
286
287
288void 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);
301
302 if (ax25->sk != NULL) {
303 while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
304 if (skb->sk != ax25->sk) {
305
306 ax25_cb *sax25 = sk_to_ax25(skb->sk);
307
308
309 sock_orphan(skb->sk);
310
311
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
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
341
342
343
344static 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
436out_put:
437 ax25_cb_put(ax25);
438 return ret;
439
440einval_put:
441 ret = -EINVAL;
442 goto out_put;
443}
444
445static 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
467
468
469void 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
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
501
502ax25_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
527
528
529
530static int ax25_setsockopt(struct socket *sock, int level, int optname,
531 sockptr_t 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 (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
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_sockptr(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
681static 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
778static 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
791out:
792 release_sock(sk);
793
794 return res;
795}
796
797
798
799
800
801static struct proto ax25_proto = {
802 .name = "AX25",
803 .owner = THIS_MODULE,
804 .obj_size = sizeof(struct ax25_sock),
805};
806
807static 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:
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
888struct 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
958static 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
1041
1042
1043
1044
1045static 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
1058
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
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
1110done:
1111 ax25_cb_add(ax25);
1112 sock_reset_flag(sk, SOCK_ZAPPED);
1113
1114out:
1115 release_sock(sk);
1116
1117 return err;
1118}
1119
1120
1121
1122
1123static 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
1134
1135
1136 if (addr_len == sizeof(struct sockaddr_ax25))
1137
1138
1139
1140 ;
1141 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1142
1143
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
1156 if (sock->state == SS_CONNECTING) {
1157 switch (sk->sk_state) {
1158 case TCP_SYN_SENT:
1159 err = -EINPROGRESS;
1160 goto out_release;
1161
1162 case TCP_ESTABLISHED:
1163 sock->state = SS_CONNECTED;
1164 goto out_release;
1165
1166 case TCP_CLOSE:
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;
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
1186
1187 if (addr_len > sizeof(struct sockaddr_ax25) &&
1188 fsa->fsa_ax25.sax25_ndigis != 0) {
1189
1190 if (fsa->fsa_ax25.sax25_ndigis < 1 ||
1191 fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS ||
1192 addr_len < sizeof(struct sockaddr_ax25) +
1193 sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) {
1194 err = -EINVAL;
1195 goto out_release;
1196 }
1197
1198 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1199 err = -ENOBUFS;
1200 goto out_release;
1201 }
1202
1203 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1204 digi->lastrepeat = -1;
1205
1206 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1207 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1208 AX25_HBIT) && ax25->iamdigi) {
1209 digi->repeated[ct] = 1;
1210 digi->lastrepeat = ct;
1211 } else {
1212 digi->repeated[ct] = 0;
1213 }
1214 digi->calls[ct] = fsa->fsa_digipeater[ct];
1215 ct++;
1216 }
1217 }
1218
1219
1220
1221
1222
1223
1224 if (sock_flag(sk, SOCK_ZAPPED)) {
1225
1226 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1227 current->comm);
1228 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1229 kfree(digi);
1230 goto out_release;
1231 }
1232
1233 ax25_fillin_cb(ax25, ax25->ax25_dev);
1234 ax25_cb_add(ax25);
1235 } else {
1236 if (ax25->ax25_dev == NULL) {
1237 kfree(digi);
1238 err = -EHOSTUNREACH;
1239 goto out_release;
1240 }
1241 }
1242
1243 if (sk->sk_type == SOCK_SEQPACKET &&
1244 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1245 ax25->ax25_dev->dev))) {
1246 kfree(digi);
1247 err = -EADDRINUSE;
1248 ax25_cb_put(ax25t);
1249 goto out_release;
1250 }
1251
1252 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1253 ax25->digipeat = digi;
1254
1255
1256 if (sk->sk_type != SOCK_SEQPACKET) {
1257 sock->state = SS_CONNECTED;
1258 sk->sk_state = TCP_ESTABLISHED;
1259 goto out_release;
1260 }
1261
1262
1263 sock->state = SS_CONNECTING;
1264 sk->sk_state = TCP_SYN_SENT;
1265
1266 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1267 case AX25_PROTO_STD_SIMPLEX:
1268 case AX25_PROTO_STD_DUPLEX:
1269 ax25_std_establish_data_link(ax25);
1270 break;
1271
1272#ifdef CONFIG_AX25_DAMA_SLAVE
1273 case AX25_PROTO_DAMA_SLAVE:
1274 ax25->modulus = AX25_MODULUS;
1275 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1276 if (ax25->ax25_dev->dama.slave)
1277 ax25_ds_establish_data_link(ax25);
1278 else
1279 ax25_std_establish_data_link(ax25);
1280 break;
1281#endif
1282 }
1283
1284 ax25->state = AX25_STATE_1;
1285
1286 ax25_start_heartbeat(ax25);
1287
1288
1289 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1290 err = -EINPROGRESS;
1291 goto out_release;
1292 }
1293
1294 if (sk->sk_state == TCP_SYN_SENT) {
1295 DEFINE_WAIT(wait);
1296
1297 for (;;) {
1298 prepare_to_wait(sk_sleep(sk), &wait,
1299 TASK_INTERRUPTIBLE);
1300 if (sk->sk_state != TCP_SYN_SENT)
1301 break;
1302 if (!signal_pending(current)) {
1303 release_sock(sk);
1304 schedule();
1305 lock_sock(sk);
1306 continue;
1307 }
1308 err = -ERESTARTSYS;
1309 break;
1310 }
1311 finish_wait(sk_sleep(sk), &wait);
1312
1313 if (err)
1314 goto out_release;
1315 }
1316
1317 if (sk->sk_state != TCP_ESTABLISHED) {
1318
1319 sock->state = SS_UNCONNECTED;
1320 err = sock_error(sk);
1321 goto out_release;
1322 }
1323
1324 sock->state = SS_CONNECTED;
1325
1326 err = 0;
1327out_release:
1328 release_sock(sk);
1329
1330 return err;
1331}
1332
1333static int ax25_accept(struct socket *sock, struct socket *newsock, int flags,
1334 bool kern)
1335{
1336 struct sk_buff *skb;
1337 struct sock *newsk;
1338 DEFINE_WAIT(wait);
1339 struct sock *sk;
1340 int err = 0;
1341
1342 if (sock->state != SS_UNCONNECTED)
1343 return -EINVAL;
1344
1345 if ((sk = sock->sk) == NULL)
1346 return -EINVAL;
1347
1348 lock_sock(sk);
1349 if (sk->sk_type != SOCK_SEQPACKET) {
1350 err = -EOPNOTSUPP;
1351 goto out;
1352 }
1353
1354 if (sk->sk_state != TCP_LISTEN) {
1355 err = -EINVAL;
1356 goto out;
1357 }
1358
1359
1360
1361
1362
1363 for (;;) {
1364 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1365 skb = skb_dequeue(&sk->sk_receive_queue);
1366 if (skb)
1367 break;
1368
1369 if (flags & O_NONBLOCK) {
1370 err = -EWOULDBLOCK;
1371 break;
1372 }
1373 if (!signal_pending(current)) {
1374 release_sock(sk);
1375 schedule();
1376 lock_sock(sk);
1377 continue;
1378 }
1379 err = -ERESTARTSYS;
1380 break;
1381 }
1382 finish_wait(sk_sleep(sk), &wait);
1383
1384 if (err)
1385 goto out;
1386
1387 newsk = skb->sk;
1388 sock_graft(newsk, newsock);
1389
1390
1391 kfree_skb(skb);
1392 sk_acceptq_removed(sk);
1393 newsock->state = SS_CONNECTED;
1394
1395out:
1396 release_sock(sk);
1397
1398 return err;
1399}
1400
1401static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1402 int peer)
1403{
1404 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1405 struct sock *sk = sock->sk;
1406 unsigned char ndigi, i;
1407 ax25_cb *ax25;
1408 int err = 0;
1409
1410 memset(fsa, 0, sizeof(*fsa));
1411 lock_sock(sk);
1412 ax25 = sk_to_ax25(sk);
1413
1414 if (peer != 0) {
1415 if (sk->sk_state != TCP_ESTABLISHED) {
1416 err = -ENOTCONN;
1417 goto out;
1418 }
1419
1420 fsa->fsa_ax25.sax25_family = AF_AX25;
1421 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1422
1423 if (ax25->digipeat != NULL) {
1424 ndigi = ax25->digipeat->ndigi;
1425 fsa->fsa_ax25.sax25_ndigis = ndigi;
1426 for (i = 0; i < ndigi; i++)
1427 fsa->fsa_digipeater[i] =
1428 ax25->digipeat->calls[i];
1429 }
1430 } else {
1431 fsa->fsa_ax25.sax25_family = AF_AX25;
1432 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1433 fsa->fsa_ax25.sax25_ndigis = 1;
1434 if (ax25->ax25_dev != NULL) {
1435 memcpy(&fsa->fsa_digipeater[0],
1436 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1437 } else {
1438 fsa->fsa_digipeater[0] = null_ax25_address;
1439 }
1440 }
1441 err = sizeof (struct full_sockaddr_ax25);
1442
1443out:
1444 release_sock(sk);
1445
1446 return err;
1447}
1448
1449static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1450{
1451 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1452 struct sock *sk = sock->sk;
1453 struct sockaddr_ax25 sax;
1454 struct sk_buff *skb;
1455 ax25_digi dtmp, *dp;
1456 ax25_cb *ax25;
1457 size_t size;
1458 int lv, err, addr_len = msg->msg_namelen;
1459
1460 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1461 return -EINVAL;
1462
1463 lock_sock(sk);
1464 ax25 = sk_to_ax25(sk);
1465
1466 if (sock_flag(sk, SOCK_ZAPPED)) {
1467 err = -EADDRNOTAVAIL;
1468 goto out;
1469 }
1470
1471 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1472 send_sig(SIGPIPE, current, 0);
1473 err = -EPIPE;
1474 goto out;
1475 }
1476
1477 if (ax25->ax25_dev == NULL) {
1478 err = -ENETUNREACH;
1479 goto out;
1480 }
1481
1482 if (len > ax25->ax25_dev->dev->mtu) {
1483 err = -EMSGSIZE;
1484 goto out;
1485 }
1486
1487 if (usax != NULL) {
1488 if (usax->sax25_family != AF_AX25) {
1489 err = -EINVAL;
1490 goto out;
1491 }
1492
1493 if (addr_len == sizeof(struct sockaddr_ax25))
1494
1495 ;
1496 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1497
1498
1499
1500
1501 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1502 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1503 err = -EINVAL;
1504 goto out;
1505 }
1506
1507
1508 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1509 int ct = 0;
1510 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1511
1512
1513 if (usax->sax25_ndigis < 1 ||
1514 usax->sax25_ndigis > AX25_MAX_DIGIS ||
1515 addr_len < sizeof(struct sockaddr_ax25) +
1516 sizeof(ax25_address) * usax->sax25_ndigis) {
1517 err = -EINVAL;
1518 goto out;
1519 }
1520
1521 dtmp.ndigi = usax->sax25_ndigis;
1522
1523 while (ct < usax->sax25_ndigis) {
1524 dtmp.repeated[ct] = 0;
1525 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1526 ct++;
1527 }
1528
1529 dtmp.lastrepeat = 0;
1530 }
1531
1532 sax = *usax;
1533 if (sk->sk_type == SOCK_SEQPACKET &&
1534 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1535 err = -EISCONN;
1536 goto out;
1537 }
1538 if (usax->sax25_ndigis == 0)
1539 dp = NULL;
1540 else
1541 dp = &dtmp;
1542 } else {
1543
1544
1545
1546
1547
1548 if (sk->sk_state != TCP_ESTABLISHED) {
1549 err = -ENOTCONN;
1550 goto out;
1551 }
1552 sax.sax25_family = AF_AX25;
1553 sax.sax25_call = ax25->dest_addr;
1554 dp = ax25->digipeat;
1555 }
1556
1557
1558
1559 size = len + ax25->ax25_dev->dev->hard_header_len;
1560
1561 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1562 if (skb == NULL)
1563 goto out;
1564
1565 skb_reserve(skb, size - len);
1566
1567
1568 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1569 err = -EFAULT;
1570 kfree_skb(skb);
1571 goto out;
1572 }
1573
1574 skb_reset_network_header(skb);
1575
1576
1577 if (!ax25->pidincl)
1578 *(u8 *)skb_push(skb, 1) = sk->sk_protocol;
1579
1580 if (sk->sk_type == SOCK_SEQPACKET) {
1581
1582 if (sk->sk_state != TCP_ESTABLISHED) {
1583 kfree_skb(skb);
1584 err = -ENOTCONN;
1585 goto out;
1586 }
1587
1588
1589 ax25_output(ax25, ax25->paclen, skb);
1590
1591 err = len;
1592 goto out;
1593 }
1594
1595 skb_push(skb, 1 + ax25_addr_size(dp));
1596
1597
1598
1599
1600 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1601 dp, AX25_COMMAND, AX25_MODULUS);
1602
1603 skb_set_transport_header(skb, lv);
1604
1605 *skb_transport_header(skb) = AX25_UI;
1606
1607
1608 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1609
1610 err = len;
1611
1612out:
1613 release_sock(sk);
1614
1615 return err;
1616}
1617
1618static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1619 int flags)
1620{
1621 struct sock *sk = sock->sk;
1622 struct sk_buff *skb;
1623 int copied;
1624 int err = 0;
1625
1626 lock_sock(sk);
1627
1628
1629
1630
1631 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1632 err = -ENOTCONN;
1633 goto out;
1634 }
1635
1636
1637 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1638 flags & MSG_DONTWAIT, &err);
1639 if (skb == NULL)
1640 goto out;
1641
1642 if (!sk_to_ax25(sk)->pidincl)
1643 skb_pull(skb, 1);
1644
1645 skb_reset_transport_header(skb);
1646 copied = skb->len;
1647
1648 if (copied > size) {
1649 copied = size;
1650 msg->msg_flags |= MSG_TRUNC;
1651 }
1652
1653 skb_copy_datagram_msg(skb, 0, msg, copied);
1654
1655 if (msg->msg_name) {
1656 ax25_digi digi;
1657 ax25_address src;
1658 const unsigned char *mac = skb_mac_header(skb);
1659 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1660
1661 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1662 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1663 &digi, NULL, NULL);
1664 sax->sax25_family = AF_AX25;
1665
1666
1667
1668 sax->sax25_ndigis = digi.ndigi;
1669 sax->sax25_call = src;
1670
1671 if (sax->sax25_ndigis != 0) {
1672 int ct;
1673 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1674
1675 for (ct = 0; ct < digi.ndigi; ct++)
1676 fsa->fsa_digipeater[ct] = digi.calls[ct];
1677 }
1678 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1679 }
1680
1681 skb_free_datagram(sk, skb);
1682 err = copied;
1683
1684out:
1685 release_sock(sk);
1686
1687 return err;
1688}
1689
1690static int ax25_shutdown(struct socket *sk, int how)
1691{
1692
1693 return -EOPNOTSUPP;
1694}
1695
1696static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1697{
1698 struct sock *sk = sock->sk;
1699 void __user *argp = (void __user *)arg;
1700 int res = 0;
1701
1702 lock_sock(sk);
1703 switch (cmd) {
1704 case TIOCOUTQ: {
1705 long amount;
1706
1707 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1708 if (amount < 0)
1709 amount = 0;
1710 res = put_user(amount, (int __user *)argp);
1711 break;
1712 }
1713
1714 case TIOCINQ: {
1715 struct sk_buff *skb;
1716 long amount = 0L;
1717
1718 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1719 amount = skb->len;
1720 res = put_user(amount, (int __user *) argp);
1721 break;
1722 }
1723
1724 case SIOCAX25ADDUID:
1725 case SIOCAX25DELUID:
1726 case SIOCAX25GETUID: {
1727 struct sockaddr_ax25 sax25;
1728 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1729 res = -EFAULT;
1730 break;
1731 }
1732 res = ax25_uid_ioctl(cmd, &sax25);
1733 break;
1734 }
1735
1736 case SIOCAX25NOUID: {
1737 long amount;
1738 if (!capable(CAP_NET_ADMIN)) {
1739 res = -EPERM;
1740 break;
1741 }
1742 if (get_user(amount, (long __user *)argp)) {
1743 res = -EFAULT;
1744 break;
1745 }
1746 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1747 res = -EINVAL;
1748 break;
1749 }
1750 ax25_uid_policy = amount;
1751 res = 0;
1752 break;
1753 }
1754
1755 case SIOCADDRT:
1756 case SIOCDELRT:
1757 case SIOCAX25OPTRT:
1758 if (!capable(CAP_NET_ADMIN)) {
1759 res = -EPERM;
1760 break;
1761 }
1762 res = ax25_rt_ioctl(cmd, argp);
1763 break;
1764
1765 case SIOCAX25CTLCON:
1766 if (!capable(CAP_NET_ADMIN)) {
1767 res = -EPERM;
1768 break;
1769 }
1770 res = ax25_ctl_ioctl(cmd, argp);
1771 break;
1772
1773 case SIOCAX25GETINFO:
1774 case SIOCAX25GETINFOOLD: {
1775 ax25_cb *ax25 = sk_to_ax25(sk);
1776 struct ax25_info_struct ax25_info;
1777
1778 ax25_info.t1 = ax25->t1 / HZ;
1779 ax25_info.t2 = ax25->t2 / HZ;
1780 ax25_info.t3 = ax25->t3 / HZ;
1781 ax25_info.idle = ax25->idle / (60 * HZ);
1782 ax25_info.n2 = ax25->n2;
1783 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1784 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1785 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1786 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1787 ax25_info.n2count = ax25->n2count;
1788 ax25_info.state = ax25->state;
1789 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1790 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1791 ax25_info.vs = ax25->vs;
1792 ax25_info.vr = ax25->vr;
1793 ax25_info.va = ax25->va;
1794 ax25_info.vs_max = ax25->vs;
1795 ax25_info.paclen = ax25->paclen;
1796 ax25_info.window = ax25->window;
1797
1798
1799 if (cmd == SIOCAX25GETINFOOLD) {
1800 static int warned = 0;
1801 if (!warned) {
1802 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1803 current->comm);
1804 warned=1;
1805 }
1806
1807 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1808 res = -EFAULT;
1809 break;
1810 }
1811 } else {
1812 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1813 res = -EINVAL;
1814 break;
1815 }
1816 }
1817 res = 0;
1818 break;
1819 }
1820
1821 case SIOCAX25ADDFWD:
1822 case SIOCAX25DELFWD: {
1823 struct ax25_fwd_struct ax25_fwd;
1824 if (!capable(CAP_NET_ADMIN)) {
1825 res = -EPERM;
1826 break;
1827 }
1828 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1829 res = -EFAULT;
1830 break;
1831 }
1832 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1833 break;
1834 }
1835
1836 case SIOCGIFADDR:
1837 case SIOCSIFADDR:
1838 case SIOCGIFDSTADDR:
1839 case SIOCSIFDSTADDR:
1840 case SIOCGIFBRDADDR:
1841 case SIOCSIFBRDADDR:
1842 case SIOCGIFNETMASK:
1843 case SIOCSIFNETMASK:
1844 case SIOCGIFMETRIC:
1845 case SIOCSIFMETRIC:
1846 res = -EINVAL;
1847 break;
1848
1849 default:
1850 res = -ENOIOCTLCMD;
1851 break;
1852 }
1853 release_sock(sk);
1854
1855 return res;
1856}
1857
1858#ifdef CONFIG_PROC_FS
1859
1860static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1861 __acquires(ax25_list_lock)
1862{
1863 spin_lock_bh(&ax25_list_lock);
1864 return seq_hlist_start(&ax25_list, *pos);
1865}
1866
1867static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1868{
1869 return seq_hlist_next(v, &ax25_list, pos);
1870}
1871
1872static void ax25_info_stop(struct seq_file *seq, void *v)
1873 __releases(ax25_list_lock)
1874{
1875 spin_unlock_bh(&ax25_list_lock);
1876}
1877
1878static int ax25_info_show(struct seq_file *seq, void *v)
1879{
1880 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1881 char buf[11];
1882 int k;
1883
1884
1885
1886
1887
1888
1889
1890 seq_printf(seq, "%p %s %s%s ",
1891 ax25,
1892 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1893 ax2asc(buf, &ax25->source_addr),
1894 ax25->iamdigi? "*":"");
1895 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1896
1897 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1898 seq_printf(seq, ",%s%s",
1899 ax2asc(buf, &ax25->digipeat->calls[k]),
1900 ax25->digipeat->repeated[k]? "*":"");
1901 }
1902
1903 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1904 ax25->state,
1905 ax25->vs, ax25->vr, ax25->va,
1906 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1907 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1908 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1909 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1910 ax25->idle / (60 * HZ),
1911 ax25->n2count, ax25->n2,
1912 ax25->rtt / HZ,
1913 ax25->window,
1914 ax25->paclen);
1915
1916 if (ax25->sk != NULL) {
1917 seq_printf(seq, " %d %d %lu\n",
1918 sk_wmem_alloc_get(ax25->sk),
1919 sk_rmem_alloc_get(ax25->sk),
1920 sock_i_ino(ax25->sk));
1921 } else {
1922 seq_puts(seq, " * * *\n");
1923 }
1924 return 0;
1925}
1926
1927static const struct seq_operations ax25_info_seqops = {
1928 .start = ax25_info_start,
1929 .next = ax25_info_next,
1930 .stop = ax25_info_stop,
1931 .show = ax25_info_show,
1932};
1933#endif
1934
1935static const struct net_proto_family ax25_family_ops = {
1936 .family = PF_AX25,
1937 .create = ax25_create,
1938 .owner = THIS_MODULE,
1939};
1940
1941static const struct proto_ops ax25_proto_ops = {
1942 .family = PF_AX25,
1943 .owner = THIS_MODULE,
1944 .release = ax25_release,
1945 .bind = ax25_bind,
1946 .connect = ax25_connect,
1947 .socketpair = sock_no_socketpair,
1948 .accept = ax25_accept,
1949 .getname = ax25_getname,
1950 .poll = datagram_poll,
1951 .ioctl = ax25_ioctl,
1952 .gettstamp = sock_gettstamp,
1953 .listen = ax25_listen,
1954 .shutdown = ax25_shutdown,
1955 .setsockopt = ax25_setsockopt,
1956 .getsockopt = ax25_getsockopt,
1957 .sendmsg = ax25_sendmsg,
1958 .recvmsg = ax25_recvmsg,
1959 .mmap = sock_no_mmap,
1960 .sendpage = sock_no_sendpage,
1961};
1962
1963
1964
1965
1966static struct packet_type ax25_packet_type __read_mostly = {
1967 .type = cpu_to_be16(ETH_P_AX25),
1968 .func = ax25_kiss_rcv,
1969};
1970
1971static struct notifier_block ax25_dev_notifier = {
1972 .notifier_call = ax25_device_event,
1973};
1974
1975static int __init ax25_init(void)
1976{
1977 int rc = proto_register(&ax25_proto, 0);
1978
1979 if (rc != 0)
1980 goto out;
1981
1982 sock_register(&ax25_family_ops);
1983 dev_add_pack(&ax25_packet_type);
1984 register_netdevice_notifier(&ax25_dev_notifier);
1985
1986 proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops);
1987 proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops);
1988 proc_create_seq("ax25_calls", 0444, init_net.proc_net,
1989 &ax25_uid_seqops);
1990out:
1991 return rc;
1992}
1993module_init(ax25_init);
1994
1995
1996MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1997MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
1998MODULE_LICENSE("GPL");
1999MODULE_ALIAS_NETPROTO(PF_AX25);
2000
2001static void __exit ax25_exit(void)
2002{
2003 remove_proc_entry("ax25_route", init_net.proc_net);
2004 remove_proc_entry("ax25", init_net.proc_net);
2005 remove_proc_entry("ax25_calls", init_net.proc_net);
2006
2007 unregister_netdevice_notifier(&ax25_dev_notifier);
2008
2009 dev_remove_pack(&ax25_packet_type);
2010
2011 sock_unregister(PF_AX25);
2012 proto_unregister(&ax25_proto);
2013
2014 ax25_rt_free();
2015 ax25_uid_free();
2016 ax25_dev_free();
2017}
2018module_exit(ax25_exit);
2019
