1
2
3
4
5
6
7
8
9
10
11
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>
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 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)
639 optlen = IFNAMSIZ;
640
641 if (copy_from_user(devname, optval, optlen)) {
642 res = -EFAULT;
643 break;
644 }
645
646 if (sk->sk_type == SOCK_SEQPACKET &&
647 (sock->state != SS_UNCONNECTED ||
648 sk->sk_state == TCP_LISTEN)) {
649 res = -EADDRNOTAVAIL;
650 break;
651 }
652
653 rtnl_lock();
654 dev = __dev_get_by_name(&init_net, devname);
655 if (!dev) {
656 rtnl_unlock();
657 res = -ENODEV;
658 break;
659 }
660
661 ax25->ax25_dev = ax25_dev_ax25dev(dev);
662 if (!ax25->ax25_dev) {
663 rtnl_unlock();
664 res = -ENODEV;
665 break;
666 }
667 ax25_fillin_cb(ax25, ax25->ax25_dev);
668 rtnl_unlock();
669 break;
670
671 default:
672 res = -ENOPROTOOPT;
673 }
674 release_sock(sk);
675
676 return res;
677}
678
679static int ax25_getsockopt(struct socket *sock, int level, int optname,
680 char __user *optval, int __user *optlen)
681{
682 struct sock *sk = sock->sk;
683 ax25_cb *ax25;
684 struct ax25_dev *ax25_dev;
685 char devname[IFNAMSIZ];
686 void *valptr;
687 int val = 0;
688 int maxlen, length;
689
690 if (level != SOL_AX25)
691 return -ENOPROTOOPT;
692
693 if (get_user(maxlen, optlen))
694 return -EFAULT;
695
696 if (maxlen < 1)
697 return -EFAULT;
698
699 valptr = (void *) &val;
700 length = min_t(unsigned int, maxlen, sizeof(int));
701
702 lock_sock(sk);
703 ax25 = sk_to_ax25(sk);
704
705 switch (optname) {
706 case AX25_WINDOW:
707 val = ax25->window;
708 break;
709
710 case AX25_T1:
711 val = ax25->t1 / HZ;
712 break;
713
714 case AX25_T2:
715 val = ax25->t2 / HZ;
716 break;
717
718 case AX25_N2:
719 val = ax25->n2;
720 break;
721
722 case AX25_T3:
723 val = ax25->t3 / HZ;
724 break;
725
726 case AX25_IDLE:
727 val = ax25->idle / (60 * HZ);
728 break;
729
730 case AX25_BACKOFF:
731 val = ax25->backoff;
732 break;
733
734 case AX25_EXTSEQ:
735 val = (ax25->modulus == AX25_EMODULUS);
736 break;
737
738 case AX25_PIDINCL:
739 val = ax25->pidincl;
740 break;
741
742 case AX25_IAMDIGI:
743 val = ax25->iamdigi;
744 break;
745
746 case AX25_PACLEN:
747 val = ax25->paclen;
748 break;
749
750 case SO_BINDTODEVICE:
751 ax25_dev = ax25->ax25_dev;
752
753 if (ax25_dev != NULL && ax25_dev->dev != NULL) {
754 strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
755 length = strlen(devname) + 1;
756 } else {
757 *devname = '\0';
758 length = 1;
759 }
760
761 valptr = (void *) devname;
762 break;
763
764 default:
765 release_sock(sk);
766 return -ENOPROTOOPT;
767 }
768 release_sock(sk);
769
770 if (put_user(length, optlen))
771 return -EFAULT;
772
773 return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
774}
775
776static int ax25_listen(struct socket *sock, int backlog)
777{
778 struct sock *sk = sock->sk;
779 int res = 0;
780
781 lock_sock(sk);
782 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
783 sk->sk_max_ack_backlog = backlog;
784 sk->sk_state = TCP_LISTEN;
785 goto out;
786 }
787 res = -EOPNOTSUPP;
788
789out:
790 release_sock(sk);
791
792 return res;
793}
794
795
796
797
798
799static struct proto ax25_proto = {
800 .name = "AX25",
801 .owner = THIS_MODULE,
802 .obj_size = sizeof(struct ax25_sock),
803};
804
805static int ax25_create(struct net *net, struct socket *sock, int protocol,
806 int kern)
807{
808 struct sock *sk;
809 ax25_cb *ax25;
810
811 if (protocol < 0 || protocol > U8_MAX)
812 return -EINVAL;
813
814 if (!net_eq(net, &init_net))
815 return -EAFNOSUPPORT;
816
817 switch (sock->type) {
818 case SOCK_DGRAM:
819 if (protocol == 0 || protocol == PF_AX25)
820 protocol = AX25_P_TEXT;
821 break;
822
823 case SOCK_SEQPACKET:
824 switch (protocol) {
825 case 0:
826 case PF_AX25:
827 protocol = AX25_P_TEXT;
828 break;
829 case AX25_P_SEGMENT:
830#ifdef CONFIG_INET
831 case AX25_P_ARP:
832 case AX25_P_IP:
833#endif
834#ifdef CONFIG_NETROM
835 case AX25_P_NETROM:
836#endif
837#ifdef CONFIG_ROSE
838 case AX25_P_ROSE:
839#endif
840 return -ESOCKTNOSUPPORT;
841#ifdef CONFIG_NETROM_MODULE
842 case AX25_P_NETROM:
843 if (ax25_protocol_is_registered(AX25_P_NETROM))
844 return -ESOCKTNOSUPPORT;
845 break;
846#endif
847#ifdef CONFIG_ROSE_MODULE
848 case AX25_P_ROSE:
849 if (ax25_protocol_is_registered(AX25_P_ROSE))
850 return -ESOCKTNOSUPPORT;
851#endif
852 default:
853 break;
854 }
855 break;
856
857 case SOCK_RAW:
858 if (!capable(CAP_NET_RAW))
859 return -EPERM;
860 break;
861 default:
862 return -ESOCKTNOSUPPORT;
863 }
864
865 sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
866 if (sk == NULL)
867 return -ENOMEM;
868
869 ax25 = ax25_sk(sk)->cb = ax25_create_cb();
870 if (!ax25) {
871 sk_free(sk);
872 return -ENOMEM;
873 }
874
875 sock_init_data(sock, sk);
876
877 sk->sk_destruct = ax25_free_sock;
878 sock->ops = &ax25_proto_ops;
879 sk->sk_protocol = protocol;
880
881 ax25->sk = sk;
882
883 return 0;
884}
885
886struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
887{
888 struct sock *sk;
889 ax25_cb *ax25, *oax25;
890
891 sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
892 if (sk == NULL)
893 return NULL;
894
895 if ((ax25 = ax25_create_cb()) == NULL) {
896 sk_free(sk);
897 return NULL;
898 }
899
900 switch (osk->sk_type) {
901 case SOCK_DGRAM:
902 break;
903 case SOCK_SEQPACKET:
904 break;
905 default:
906 sk_free(sk);
907 ax25_cb_put(ax25);
908 return NULL;
909 }
910
911 sock_init_data(NULL, sk);
912
913 sk->sk_type = osk->sk_type;
914 sk->sk_priority = osk->sk_priority;
915 sk->sk_protocol = osk->sk_protocol;
916 sk->sk_rcvbuf = osk->sk_rcvbuf;
917 sk->sk_sndbuf = osk->sk_sndbuf;
918 sk->sk_state = TCP_ESTABLISHED;
919 sock_copy_flags(sk, osk);
920
921 oax25 = sk_to_ax25(osk);
922
923 ax25->modulus = oax25->modulus;
924 ax25->backoff = oax25->backoff;
925 ax25->pidincl = oax25->pidincl;
926 ax25->iamdigi = oax25->iamdigi;
927 ax25->rtt = oax25->rtt;
928 ax25->t1 = oax25->t1;
929 ax25->t2 = oax25->t2;
930 ax25->t3 = oax25->t3;
931 ax25->n2 = oax25->n2;
932 ax25->idle = oax25->idle;
933 ax25->paclen = oax25->paclen;
934 ax25->window = oax25->window;
935
936 ax25->ax25_dev = ax25_dev;
937 ax25->source_addr = oax25->source_addr;
938
939 if (oax25->digipeat != NULL) {
940 ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
941 GFP_ATOMIC);
942 if (ax25->digipeat == NULL) {
943 sk_free(sk);
944 ax25_cb_put(ax25);
945 return NULL;
946 }
947 }
948
949 ax25_sk(sk)->cb = ax25;
950 sk->sk_destruct = ax25_free_sock;
951 ax25->sk = sk;
952
953 return sk;
954}
955
956static int ax25_release(struct socket *sock)
957{
958 struct sock *sk = sock->sk;
959 ax25_cb *ax25;
960
961 if (sk == NULL)
962 return 0;
963
964 sock_hold(sk);
965 sock_orphan(sk);
966 lock_sock(sk);
967 ax25 = sk_to_ax25(sk);
968
969 if (sk->sk_type == SOCK_SEQPACKET) {
970 switch (ax25->state) {
971 case AX25_STATE_0:
972 release_sock(sk);
973 ax25_disconnect(ax25, 0);
974 lock_sock(sk);
975 ax25_destroy_socket(ax25);
976 break;
977
978 case AX25_STATE_1:
979 case AX25_STATE_2:
980 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
981 release_sock(sk);
982 ax25_disconnect(ax25, 0);
983 lock_sock(sk);
984 if (!sock_flag(ax25->sk, SOCK_DESTROY))
985 ax25_destroy_socket(ax25);
986 break;
987
988 case AX25_STATE_3:
989 case AX25_STATE_4:
990 ax25_clear_queues(ax25);
991 ax25->n2count = 0;
992
993 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
994 case AX25_PROTO_STD_SIMPLEX:
995 case AX25_PROTO_STD_DUPLEX:
996 ax25_send_control(ax25,
997 AX25_DISC,
998 AX25_POLLON,
999 AX25_COMMAND);
1000 ax25_stop_t2timer(ax25);
1001 ax25_stop_t3timer(ax25);
1002 ax25_stop_idletimer(ax25);
1003 break;
1004#ifdef CONFIG_AX25_DAMA_SLAVE
1005 case AX25_PROTO_DAMA_SLAVE:
1006 ax25_stop_t3timer(ax25);
1007 ax25_stop_idletimer(ax25);
1008 break;
1009#endif
1010 }
1011 ax25_calculate_t1(ax25);
1012 ax25_start_t1timer(ax25);
1013 ax25->state = AX25_STATE_2;
1014 sk->sk_state = TCP_CLOSE;
1015 sk->sk_shutdown |= SEND_SHUTDOWN;
1016 sk->sk_state_change(sk);
1017 sock_set_flag(sk, SOCK_DESTROY);
1018 break;
1019
1020 default:
1021 break;
1022 }
1023 } else {
1024 sk->sk_state = TCP_CLOSE;
1025 sk->sk_shutdown |= SEND_SHUTDOWN;
1026 sk->sk_state_change(sk);
1027 ax25_destroy_socket(ax25);
1028 }
1029
1030 sock->sk = NULL;
1031 release_sock(sk);
1032 sock_put(sk);
1033
1034 return 0;
1035}
1036
1037
1038
1039
1040
1041
1042
1043static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1044{
1045 struct sock *sk = sock->sk;
1046 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
1047 ax25_dev *ax25_dev = NULL;
1048 ax25_uid_assoc *user;
1049 ax25_address call;
1050 ax25_cb *ax25;
1051 int err = 0;
1052
1053 if (addr_len != sizeof(struct sockaddr_ax25) &&
1054 addr_len != sizeof(struct full_sockaddr_ax25))
1055
1056
1057
1058 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1059 (addr_len > sizeof(struct full_sockaddr_ax25)))
1060 return -EINVAL;
1061
1062 if (addr->fsa_ax25.sax25_family != AF_AX25)
1063 return -EINVAL;
1064
1065 user = ax25_findbyuid(current_euid());
1066 if (user) {
1067 call = user->call;
1068 ax25_uid_put(user);
1069 } else {
1070 if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
1071 return -EACCES;
1072
1073 call = addr->fsa_ax25.sax25_call;
1074 }
1075
1076 lock_sock(sk);
1077
1078 ax25 = sk_to_ax25(sk);
1079 if (!sock_flag(sk, SOCK_ZAPPED)) {
1080 err = -EINVAL;
1081 goto out;
1082 }
1083
1084 ax25->source_addr = call;
1085
1086
1087
1088
1089 if (ax25->ax25_dev != NULL)
1090 goto done;
1091
1092 if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
1093 if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
1094 (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
1095 err = -EADDRNOTAVAIL;
1096 goto out;
1097 }
1098 } else {
1099 if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
1100 err = -EADDRNOTAVAIL;
1101 goto out;
1102 }
1103 }
1104
1105 if (ax25_dev != NULL)
1106 ax25_fillin_cb(ax25, ax25_dev);
1107
1108done:
1109 ax25_cb_add(ax25);
1110 sock_reset_flag(sk, SOCK_ZAPPED);
1111
1112out:
1113 release_sock(sk);
1114
1115 return err;
1116}
1117
1118
1119
1120
1121static int __must_check ax25_connect(struct socket *sock,
1122 struct sockaddr *uaddr, int addr_len, int flags)
1123{
1124 struct sock *sk = sock->sk;
1125 ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
1126 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1127 ax25_digi *digi = NULL;
1128 int ct = 0, err = 0;
1129
1130
1131
1132
1133
1134 if (addr_len == sizeof(struct sockaddr_ax25))
1135
1136
1137
1138 ;
1139 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1140
1141
1142
1143 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1144 (addr_len > sizeof(struct full_sockaddr_ax25)))
1145 return -EINVAL;
1146
1147
1148 if (fsa->fsa_ax25.sax25_family != AF_AX25)
1149 return -EINVAL;
1150
1151 lock_sock(sk);
1152
1153
1154 if (sock->state == SS_CONNECTING) {
1155 switch (sk->sk_state) {
1156 case TCP_SYN_SENT:
1157 err = -EINPROGRESS;
1158 goto out_release;
1159
1160 case TCP_ESTABLISHED:
1161 sock->state = SS_CONNECTED;
1162 goto out_release;
1163
1164 case TCP_CLOSE:
1165 sock->state = SS_UNCONNECTED;
1166 err = -ECONNREFUSED;
1167 goto out_release;
1168 }
1169 }
1170
1171 if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
1172 err = -EISCONN;
1173 goto out_release;
1174 }
1175
1176 sk->sk_state = TCP_CLOSE;
1177 sock->state = SS_UNCONNECTED;
1178
1179 kfree(ax25->digipeat);
1180 ax25->digipeat = NULL;
1181
1182
1183
1184
1185 if (addr_len > sizeof(struct sockaddr_ax25) &&
1186 fsa->fsa_ax25.sax25_ndigis != 0) {
1187
1188 if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
1189 err = -EINVAL;
1190 goto out_release;
1191 }
1192
1193 if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
1194 err = -ENOBUFS;
1195 goto out_release;
1196 }
1197
1198 digi->ndigi = fsa->fsa_ax25.sax25_ndigis;
1199 digi->lastrepeat = -1;
1200
1201 while (ct < fsa->fsa_ax25.sax25_ndigis) {
1202 if ((fsa->fsa_digipeater[ct].ax25_call[6] &
1203 AX25_HBIT) && ax25->iamdigi) {
1204 digi->repeated[ct] = 1;
1205 digi->lastrepeat = ct;
1206 } else {
1207 digi->repeated[ct] = 0;
1208 }
1209 digi->calls[ct] = fsa->fsa_digipeater[ct];
1210 ct++;
1211 }
1212 }
1213
1214
1215
1216
1217
1218
1219 if (sock_flag(sk, SOCK_ZAPPED)) {
1220
1221 printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
1222 current->comm);
1223 if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
1224 kfree(digi);
1225 goto out_release;
1226 }
1227
1228 ax25_fillin_cb(ax25, ax25->ax25_dev);
1229 ax25_cb_add(ax25);
1230 } else {
1231 if (ax25->ax25_dev == NULL) {
1232 kfree(digi);
1233 err = -EHOSTUNREACH;
1234 goto out_release;
1235 }
1236 }
1237
1238 if (sk->sk_type == SOCK_SEQPACKET &&
1239 (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
1240 ax25->ax25_dev->dev))) {
1241 kfree(digi);
1242 err = -EADDRINUSE;
1243 ax25_cb_put(ax25t);
1244 goto out_release;
1245 }
1246
1247 ax25->dest_addr = fsa->fsa_ax25.sax25_call;
1248 ax25->digipeat = digi;
1249
1250
1251 if (sk->sk_type != SOCK_SEQPACKET) {
1252 sock->state = SS_CONNECTED;
1253 sk->sk_state = TCP_ESTABLISHED;
1254 goto out_release;
1255 }
1256
1257
1258 sock->state = SS_CONNECTING;
1259 sk->sk_state = TCP_SYN_SENT;
1260
1261 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
1262 case AX25_PROTO_STD_SIMPLEX:
1263 case AX25_PROTO_STD_DUPLEX:
1264 ax25_std_establish_data_link(ax25);
1265 break;
1266
1267#ifdef CONFIG_AX25_DAMA_SLAVE
1268 case AX25_PROTO_DAMA_SLAVE:
1269 ax25->modulus = AX25_MODULUS;
1270 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
1271 if (ax25->ax25_dev->dama.slave)
1272 ax25_ds_establish_data_link(ax25);
1273 else
1274 ax25_std_establish_data_link(ax25);
1275 break;
1276#endif
1277 }
1278
1279 ax25->state = AX25_STATE_1;
1280
1281 ax25_start_heartbeat(ax25);
1282
1283
1284 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
1285 err = -EINPROGRESS;
1286 goto out_release;
1287 }
1288
1289 if (sk->sk_state == TCP_SYN_SENT) {
1290 DEFINE_WAIT(wait);
1291
1292 for (;;) {
1293 prepare_to_wait(sk_sleep(sk), &wait,
1294 TASK_INTERRUPTIBLE);
1295 if (sk->sk_state != TCP_SYN_SENT)
1296 break;
1297 if (!signal_pending(current)) {
1298 release_sock(sk);
1299 schedule();
1300 lock_sock(sk);
1301 continue;
1302 }
1303 err = -ERESTARTSYS;
1304 break;
1305 }
1306 finish_wait(sk_sleep(sk), &wait);
1307
1308 if (err)
1309 goto out_release;
1310 }
1311
1312 if (sk->sk_state != TCP_ESTABLISHED) {
1313
1314 sock->state = SS_UNCONNECTED;
1315 err = sock_error(sk);
1316 goto out_release;
1317 }
1318
1319 sock->state = SS_CONNECTED;
1320
1321 err = 0;
1322out_release:
1323 release_sock(sk);
1324
1325 return err;
1326}
1327
1328static int ax25_accept(struct socket *sock, struct socket *newsock, int flags,
1329 bool kern)
1330{
1331 struct sk_buff *skb;
1332 struct sock *newsk;
1333 DEFINE_WAIT(wait);
1334 struct sock *sk;
1335 int err = 0;
1336
1337 if (sock->state != SS_UNCONNECTED)
1338 return -EINVAL;
1339
1340 if ((sk = sock->sk) == NULL)
1341 return -EINVAL;
1342
1343 lock_sock(sk);
1344 if (sk->sk_type != SOCK_SEQPACKET) {
1345 err = -EOPNOTSUPP;
1346 goto out;
1347 }
1348
1349 if (sk->sk_state != TCP_LISTEN) {
1350 err = -EINVAL;
1351 goto out;
1352 }
1353
1354
1355
1356
1357
1358 for (;;) {
1359 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1360 skb = skb_dequeue(&sk->sk_receive_queue);
1361 if (skb)
1362 break;
1363
1364 if (flags & O_NONBLOCK) {
1365 err = -EWOULDBLOCK;
1366 break;
1367 }
1368 if (!signal_pending(current)) {
1369 release_sock(sk);
1370 schedule();
1371 lock_sock(sk);
1372 continue;
1373 }
1374 err = -ERESTARTSYS;
1375 break;
1376 }
1377 finish_wait(sk_sleep(sk), &wait);
1378
1379 if (err)
1380 goto out;
1381
1382 newsk = skb->sk;
1383 sock_graft(newsk, newsock);
1384
1385
1386 kfree_skb(skb);
1387 sk_acceptq_removed(sk);
1388 newsock->state = SS_CONNECTED;
1389
1390out:
1391 release_sock(sk);
1392
1393 return err;
1394}
1395
1396static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
1397 int peer)
1398{
1399 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
1400 struct sock *sk = sock->sk;
1401 unsigned char ndigi, i;
1402 ax25_cb *ax25;
1403 int err = 0;
1404
1405 memset(fsa, 0, sizeof(*fsa));
1406 lock_sock(sk);
1407 ax25 = sk_to_ax25(sk);
1408
1409 if (peer != 0) {
1410 if (sk->sk_state != TCP_ESTABLISHED) {
1411 err = -ENOTCONN;
1412 goto out;
1413 }
1414
1415 fsa->fsa_ax25.sax25_family = AF_AX25;
1416 fsa->fsa_ax25.sax25_call = ax25->dest_addr;
1417
1418 if (ax25->digipeat != NULL) {
1419 ndigi = ax25->digipeat->ndigi;
1420 fsa->fsa_ax25.sax25_ndigis = ndigi;
1421 for (i = 0; i < ndigi; i++)
1422 fsa->fsa_digipeater[i] =
1423 ax25->digipeat->calls[i];
1424 }
1425 } else {
1426 fsa->fsa_ax25.sax25_family = AF_AX25;
1427 fsa->fsa_ax25.sax25_call = ax25->source_addr;
1428 fsa->fsa_ax25.sax25_ndigis = 1;
1429 if (ax25->ax25_dev != NULL) {
1430 memcpy(&fsa->fsa_digipeater[0],
1431 ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
1432 } else {
1433 fsa->fsa_digipeater[0] = null_ax25_address;
1434 }
1435 }
1436 err = sizeof (struct full_sockaddr_ax25);
1437
1438out:
1439 release_sock(sk);
1440
1441 return err;
1442}
1443
1444static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1445{
1446 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1447 struct sock *sk = sock->sk;
1448 struct sockaddr_ax25 sax;
1449 struct sk_buff *skb;
1450 ax25_digi dtmp, *dp;
1451 ax25_cb *ax25;
1452 size_t size;
1453 int lv, err, addr_len = msg->msg_namelen;
1454
1455 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1456 return -EINVAL;
1457
1458 lock_sock(sk);
1459 ax25 = sk_to_ax25(sk);
1460
1461 if (sock_flag(sk, SOCK_ZAPPED)) {
1462 err = -EADDRNOTAVAIL;
1463 goto out;
1464 }
1465
1466 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1467 send_sig(SIGPIPE, current, 0);
1468 err = -EPIPE;
1469 goto out;
1470 }
1471
1472 if (ax25->ax25_dev == NULL) {
1473 err = -ENETUNREACH;
1474 goto out;
1475 }
1476
1477 if (len > ax25->ax25_dev->dev->mtu) {
1478 err = -EMSGSIZE;
1479 goto out;
1480 }
1481
1482 if (usax != NULL) {
1483 if (usax->sax25_family != AF_AX25) {
1484 err = -EINVAL;
1485 goto out;
1486 }
1487
1488 if (addr_len == sizeof(struct sockaddr_ax25))
1489
1490 ;
1491 else if (addr_len != sizeof(struct full_sockaddr_ax25))
1492
1493
1494
1495
1496 if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
1497 (addr_len > sizeof(struct full_sockaddr_ax25))) {
1498 err = -EINVAL;
1499 goto out;
1500 }
1501
1502
1503 if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
1504 int ct = 0;
1505 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
1506
1507
1508 if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
1509 err = -EINVAL;
1510 goto out;
1511 }
1512
1513 dtmp.ndigi = usax->sax25_ndigis;
1514
1515 while (ct < usax->sax25_ndigis) {
1516 dtmp.repeated[ct] = 0;
1517 dtmp.calls[ct] = fsa->fsa_digipeater[ct];
1518 ct++;
1519 }
1520
1521 dtmp.lastrepeat = 0;
1522 }
1523
1524 sax = *usax;
1525 if (sk->sk_type == SOCK_SEQPACKET &&
1526 ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
1527 err = -EISCONN;
1528 goto out;
1529 }
1530 if (usax->sax25_ndigis == 0)
1531 dp = NULL;
1532 else
1533 dp = &dtmp;
1534 } else {
1535
1536
1537
1538
1539
1540 if (sk->sk_state != TCP_ESTABLISHED) {
1541 err = -ENOTCONN;
1542 goto out;
1543 }
1544 sax.sax25_family = AF_AX25;
1545 sax.sax25_call = ax25->dest_addr;
1546 dp = ax25->digipeat;
1547 }
1548
1549
1550
1551 size = len + ax25->ax25_dev->dev->hard_header_len;
1552
1553 skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
1554 if (skb == NULL)
1555 goto out;
1556
1557 skb_reserve(skb, size - len);
1558
1559
1560 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1561 err = -EFAULT;
1562 kfree_skb(skb);
1563 goto out;
1564 }
1565
1566 skb_reset_network_header(skb);
1567
1568
1569 if (!ax25->pidincl)
1570 *(u8 *)skb_push(skb, 1) = sk->sk_protocol;
1571
1572 if (sk->sk_type == SOCK_SEQPACKET) {
1573
1574 if (sk->sk_state != TCP_ESTABLISHED) {
1575 kfree_skb(skb);
1576 err = -ENOTCONN;
1577 goto out;
1578 }
1579
1580
1581 ax25_output(ax25, ax25->paclen, skb);
1582
1583 err = len;
1584 goto out;
1585 }
1586
1587 skb_push(skb, 1 + ax25_addr_size(dp));
1588
1589
1590
1591
1592 lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
1593 dp, AX25_COMMAND, AX25_MODULUS);
1594
1595 skb_set_transport_header(skb, lv);
1596
1597 *skb_transport_header(skb) = AX25_UI;
1598
1599
1600 ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1601
1602 err = len;
1603
1604out:
1605 release_sock(sk);
1606
1607 return err;
1608}
1609
1610static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1611 int flags)
1612{
1613 struct sock *sk = sock->sk;
1614 struct sk_buff *skb;
1615 int copied;
1616 int err = 0;
1617
1618 lock_sock(sk);
1619
1620
1621
1622
1623 if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
1624 err = -ENOTCONN;
1625 goto out;
1626 }
1627
1628
1629 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1630 flags & MSG_DONTWAIT, &err);
1631 if (skb == NULL)
1632 goto out;
1633
1634 if (!sk_to_ax25(sk)->pidincl)
1635 skb_pull(skb, 1);
1636
1637 skb_reset_transport_header(skb);
1638 copied = skb->len;
1639
1640 if (copied > size) {
1641 copied = size;
1642 msg->msg_flags |= MSG_TRUNC;
1643 }
1644
1645 skb_copy_datagram_msg(skb, 0, msg, copied);
1646
1647 if (msg->msg_name) {
1648 ax25_digi digi;
1649 ax25_address src;
1650 const unsigned char *mac = skb_mac_header(skb);
1651 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1652
1653 memset(sax, 0, sizeof(struct full_sockaddr_ax25));
1654 ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
1655 &digi, NULL, NULL);
1656 sax->sax25_family = AF_AX25;
1657
1658
1659
1660 sax->sax25_ndigis = digi.ndigi;
1661 sax->sax25_call = src;
1662
1663 if (sax->sax25_ndigis != 0) {
1664 int ct;
1665 struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
1666
1667 for (ct = 0; ct < digi.ndigi; ct++)
1668 fsa->fsa_digipeater[ct] = digi.calls[ct];
1669 }
1670 msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
1671 }
1672
1673 skb_free_datagram(sk, skb);
1674 err = copied;
1675
1676out:
1677 release_sock(sk);
1678
1679 return err;
1680}
1681
1682static int ax25_shutdown(struct socket *sk, int how)
1683{
1684
1685 return -EOPNOTSUPP;
1686}
1687
1688static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1689{
1690 struct sock *sk = sock->sk;
1691 void __user *argp = (void __user *)arg;
1692 int res = 0;
1693
1694 lock_sock(sk);
1695 switch (cmd) {
1696 case TIOCOUTQ: {
1697 long amount;
1698
1699 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1700 if (amount < 0)
1701 amount = 0;
1702 res = put_user(amount, (int __user *)argp);
1703 break;
1704 }
1705
1706 case TIOCINQ: {
1707 struct sk_buff *skb;
1708 long amount = 0L;
1709
1710 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1711 amount = skb->len;
1712 res = put_user(amount, (int __user *) argp);
1713 break;
1714 }
1715
1716 case SIOCAX25ADDUID:
1717 case SIOCAX25DELUID:
1718 case SIOCAX25GETUID: {
1719 struct sockaddr_ax25 sax25;
1720 if (copy_from_user(&sax25, argp, sizeof(sax25))) {
1721 res = -EFAULT;
1722 break;
1723 }
1724 res = ax25_uid_ioctl(cmd, &sax25);
1725 break;
1726 }
1727
1728 case SIOCAX25NOUID: {
1729 long amount;
1730 if (!capable(CAP_NET_ADMIN)) {
1731 res = -EPERM;
1732 break;
1733 }
1734 if (get_user(amount, (long __user *)argp)) {
1735 res = -EFAULT;
1736 break;
1737 }
1738 if (amount < 0 || amount > AX25_NOUID_BLOCK) {
1739 res = -EINVAL;
1740 break;
1741 }
1742 ax25_uid_policy = amount;
1743 res = 0;
1744 break;
1745 }
1746
1747 case SIOCADDRT:
1748 case SIOCDELRT:
1749 case SIOCAX25OPTRT:
1750 if (!capable(CAP_NET_ADMIN)) {
1751 res = -EPERM;
1752 break;
1753 }
1754 res = ax25_rt_ioctl(cmd, argp);
1755 break;
1756
1757 case SIOCAX25CTLCON:
1758 if (!capable(CAP_NET_ADMIN)) {
1759 res = -EPERM;
1760 break;
1761 }
1762 res = ax25_ctl_ioctl(cmd, argp);
1763 break;
1764
1765 case SIOCAX25GETINFO:
1766 case SIOCAX25GETINFOOLD: {
1767 ax25_cb *ax25 = sk_to_ax25(sk);
1768 struct ax25_info_struct ax25_info;
1769
1770 ax25_info.t1 = ax25->t1 / HZ;
1771 ax25_info.t2 = ax25->t2 / HZ;
1772 ax25_info.t3 = ax25->t3 / HZ;
1773 ax25_info.idle = ax25->idle / (60 * HZ);
1774 ax25_info.n2 = ax25->n2;
1775 ax25_info.t1timer = ax25_display_timer(&ax25->t1timer) / HZ;
1776 ax25_info.t2timer = ax25_display_timer(&ax25->t2timer) / HZ;
1777 ax25_info.t3timer = ax25_display_timer(&ax25->t3timer) / HZ;
1778 ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
1779 ax25_info.n2count = ax25->n2count;
1780 ax25_info.state = ax25->state;
1781 ax25_info.rcv_q = sk_rmem_alloc_get(sk);
1782 ax25_info.snd_q = sk_wmem_alloc_get(sk);
1783 ax25_info.vs = ax25->vs;
1784 ax25_info.vr = ax25->vr;
1785 ax25_info.va = ax25->va;
1786 ax25_info.vs_max = ax25->vs;
1787 ax25_info.paclen = ax25->paclen;
1788 ax25_info.window = ax25->window;
1789
1790
1791 if (cmd == SIOCAX25GETINFOOLD) {
1792 static int warned = 0;
1793 if (!warned) {
1794 printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
1795 current->comm);
1796 warned=1;
1797 }
1798
1799 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
1800 res = -EFAULT;
1801 break;
1802 }
1803 } else {
1804 if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
1805 res = -EINVAL;
1806 break;
1807 }
1808 }
1809 res = 0;
1810 break;
1811 }
1812
1813 case SIOCAX25ADDFWD:
1814 case SIOCAX25DELFWD: {
1815 struct ax25_fwd_struct ax25_fwd;
1816 if (!capable(CAP_NET_ADMIN)) {
1817 res = -EPERM;
1818 break;
1819 }
1820 if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
1821 res = -EFAULT;
1822 break;
1823 }
1824 res = ax25_fwd_ioctl(cmd, &ax25_fwd);
1825 break;
1826 }
1827
1828 case SIOCGIFADDR:
1829 case SIOCSIFADDR:
1830 case SIOCGIFDSTADDR:
1831 case SIOCSIFDSTADDR:
1832 case SIOCGIFBRDADDR:
1833 case SIOCSIFBRDADDR:
1834 case SIOCGIFNETMASK:
1835 case SIOCSIFNETMASK:
1836 case SIOCGIFMETRIC:
1837 case SIOCSIFMETRIC:
1838 res = -EINVAL;
1839 break;
1840
1841 default:
1842 res = -ENOIOCTLCMD;
1843 break;
1844 }
1845 release_sock(sk);
1846
1847 return res;
1848}
1849
1850#ifdef CONFIG_PROC_FS
1851
1852static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
1853 __acquires(ax25_list_lock)
1854{
1855 spin_lock_bh(&ax25_list_lock);
1856 return seq_hlist_start(&ax25_list, *pos);
1857}
1858
1859static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
1860{
1861 return seq_hlist_next(v, &ax25_list, pos);
1862}
1863
1864static void ax25_info_stop(struct seq_file *seq, void *v)
1865 __releases(ax25_list_lock)
1866{
1867 spin_unlock_bh(&ax25_list_lock);
1868}
1869
1870static int ax25_info_show(struct seq_file *seq, void *v)
1871{
1872 ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
1873 char buf[11];
1874 int k;
1875
1876
1877
1878
1879
1880
1881
1882 seq_printf(seq, "%p %s %s%s ",
1883 ax25,
1884 ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
1885 ax2asc(buf, &ax25->source_addr),
1886 ax25->iamdigi? "*":"");
1887 seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
1888
1889 for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
1890 seq_printf(seq, ",%s%s",
1891 ax2asc(buf, &ax25->digipeat->calls[k]),
1892 ax25->digipeat->repeated[k]? "*":"");
1893 }
1894
1895 seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
1896 ax25->state,
1897 ax25->vs, ax25->vr, ax25->va,
1898 ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
1899 ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
1900 ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
1901 ax25_display_timer(&ax25->idletimer) / (60 * HZ),
1902 ax25->idle / (60 * HZ),
1903 ax25->n2count, ax25->n2,
1904 ax25->rtt / HZ,
1905 ax25->window,
1906 ax25->paclen);
1907
1908 if (ax25->sk != NULL) {
1909 seq_printf(seq, " %d %d %lu\n",
1910 sk_wmem_alloc_get(ax25->sk),
1911 sk_rmem_alloc_get(ax25->sk),
1912 sock_i_ino(ax25->sk));
1913 } else {
1914 seq_puts(seq, " * * *\n");
1915 }
1916 return 0;
1917}
1918
1919static const struct seq_operations ax25_info_seqops = {
1920 .start = ax25_info_start,
1921 .next = ax25_info_next,
1922 .stop = ax25_info_stop,
1923 .show = ax25_info_show,
1924};
1925#endif
1926
1927static const struct net_proto_family ax25_family_ops = {
1928 .family = PF_AX25,
1929 .create = ax25_create,
1930 .owner = THIS_MODULE,
1931};
1932
1933static const struct proto_ops ax25_proto_ops = {
1934 .family = PF_AX25,
1935 .owner = THIS_MODULE,
1936 .release = ax25_release,
1937 .bind = ax25_bind,
1938 .connect = ax25_connect,
1939 .socketpair = sock_no_socketpair,
1940 .accept = ax25_accept,
1941 .getname = ax25_getname,
1942 .poll = datagram_poll,
1943 .ioctl = ax25_ioctl,
1944 .gettstamp = sock_gettstamp,
1945 .listen = ax25_listen,
1946 .shutdown = ax25_shutdown,
1947 .setsockopt = ax25_setsockopt,
1948 .getsockopt = ax25_getsockopt,
1949 .sendmsg = ax25_sendmsg,
1950 .recvmsg = ax25_recvmsg,
1951 .mmap = sock_no_mmap,
1952 .sendpage = sock_no_sendpage,
1953};
1954
1955
1956
1957
1958static struct packet_type ax25_packet_type __read_mostly = {
1959 .type = cpu_to_be16(ETH_P_AX25),
1960 .func = ax25_kiss_rcv,
1961};
1962
1963static struct notifier_block ax25_dev_notifier = {
1964 .notifier_call = ax25_device_event,
1965};
1966
1967static int __init ax25_init(void)
1968{
1969 int rc = proto_register(&ax25_proto, 0);
1970
1971 if (rc != 0)
1972 goto out;
1973
1974 sock_register(&ax25_family_ops);
1975 dev_add_pack(&ax25_packet_type);
1976 register_netdevice_notifier(&ax25_dev_notifier);
1977
1978 proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops);
1979 proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops);
1980 proc_create_seq("ax25_calls", 0444, init_net.proc_net,
1981 &ax25_uid_seqops);
1982out:
1983 return rc;
1984}
1985module_init(ax25_init);
1986
1987
1988MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1989MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
1990MODULE_LICENSE("GPL");
1991MODULE_ALIAS_NETPROTO(PF_AX25);
1992
1993static void __exit ax25_exit(void)
1994{
1995 remove_proc_entry("ax25_route", init_net.proc_net);
1996 remove_proc_entry("ax25", init_net.proc_net);
1997 remove_proc_entry("ax25_calls", init_net.proc_net);
1998
1999 unregister_netdevice_notifier(&ax25_dev_notifier);
2000
2001 dev_remove_pack(&ax25_packet_type);
2002
2003 sock_unregister(PF_AX25);
2004 proto_unregister(&ax25_proto);
2005
2006 ax25_rt_free();
2007 ax25_uid_free();
2008 ax25_dev_free();
2009}
2010module_exit(ax25_exit);
2011
