1
2
3
4
5
6
7
8
9
10
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/capability.h>
14#include <linux/errno.h>
15#include <linux/types.h>
16#include <linux/socket.h>
17#include <linux/in.h>
18#include <linux/slab.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/stat.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/net_namespace.h>
32#include <net/sock.h>
33#include <linux/uaccess.h>
34#include <linux/fcntl.h>
35#include <linux/termios.h>
36#include <linux/mm.h>
37#include <linux/interrupt.h>
38#include <linux/notifier.h>
39#include <net/netrom.h>
40#include <linux/proc_fs.h>
41#include <linux/seq_file.h>
42#include <net/ip.h>
43#include <net/tcp_states.h>
44#include <net/arp.h>
45#include <linux/init.h>
46
47static int nr_ndevs = 4;
48
49int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
50int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
51int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
52int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
53int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
54int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
55int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
56int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
57int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
58int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
59int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
60int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
61
62static unsigned short circuit = 0x101;
63
64static HLIST_HEAD(nr_list);
65static DEFINE_SPINLOCK(nr_list_lock);
66
67static const struct proto_ops nr_proto_ops;
68
69
70
71
72
73
74
75static struct lock_class_key nr_netdev_xmit_lock_key;
76static struct lock_class_key nr_netdev_addr_lock_key;
77
78static void nr_set_lockdep_one(struct net_device *dev,
79 struct netdev_queue *txq,
80 void *_unused)
81{
82 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
83}
84
85static void nr_set_lockdep_key(struct net_device *dev)
86{
87 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
88 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
89}
90
91
92
93
94static void nr_remove_socket(struct sock *sk)
95{
96 spin_lock_bh(&nr_list_lock);
97 sk_del_node_init(sk);
98 spin_unlock_bh(&nr_list_lock);
99}
100
101
102
103
104static void nr_kill_by_device(struct net_device *dev)
105{
106 struct sock *s;
107
108 spin_lock_bh(&nr_list_lock);
109 sk_for_each(s, &nr_list)
110 if (nr_sk(s)->device == dev)
111 nr_disconnect(s, ENETUNREACH);
112 spin_unlock_bh(&nr_list_lock);
113}
114
115
116
117
118static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
119{
120 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
121
122 if (!net_eq(dev_net(dev), &init_net))
123 return NOTIFY_DONE;
124
125 if (event != NETDEV_DOWN)
126 return NOTIFY_DONE;
127
128 nr_kill_by_device(dev);
129 nr_rt_device_down(dev);
130
131 return NOTIFY_DONE;
132}
133
134
135
136
137static void nr_insert_socket(struct sock *sk)
138{
139 spin_lock_bh(&nr_list_lock);
140 sk_add_node(sk, &nr_list);
141 spin_unlock_bh(&nr_list_lock);
142}
143
144
145
146
147
148static struct sock *nr_find_listener(ax25_address *addr)
149{
150 struct sock *s;
151
152 spin_lock_bh(&nr_list_lock);
153 sk_for_each(s, &nr_list)
154 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
155 s->sk_state == TCP_LISTEN) {
156 sock_hold(s);
157 goto found;
158 }
159 s = NULL;
160found:
161 spin_unlock_bh(&nr_list_lock);
162 return s;
163}
164
165
166
167
168static struct sock *nr_find_socket(unsigned char index, unsigned char id)
169{
170 struct sock *s;
171
172 spin_lock_bh(&nr_list_lock);
173 sk_for_each(s, &nr_list) {
174 struct nr_sock *nr = nr_sk(s);
175
176 if (nr->my_index == index && nr->my_id == id) {
177 sock_hold(s);
178 goto found;
179 }
180 }
181 s = NULL;
182found:
183 spin_unlock_bh(&nr_list_lock);
184 return s;
185}
186
187
188
189
190static struct sock *nr_find_peer(unsigned char index, unsigned char id,
191 ax25_address *dest)
192{
193 struct sock *s;
194
195 spin_lock_bh(&nr_list_lock);
196 sk_for_each(s, &nr_list) {
197 struct nr_sock *nr = nr_sk(s);
198
199 if (nr->your_index == index && nr->your_id == id &&
200 !ax25cmp(&nr->dest_addr, dest)) {
201 sock_hold(s);
202 goto found;
203 }
204 }
205 s = NULL;
206found:
207 spin_unlock_bh(&nr_list_lock);
208 return s;
209}
210
211
212
213
214static unsigned short nr_find_next_circuit(void)
215{
216 unsigned short id = circuit;
217 unsigned char i, j;
218 struct sock *sk;
219
220 for (;;) {
221 i = id / 256;
222 j = id % 256;
223
224 if (i != 0 && j != 0) {
225 if ((sk=nr_find_socket(i, j)) == NULL)
226 break;
227 sock_put(sk);
228 }
229
230 id++;
231 }
232
233 return id;
234}
235
236
237
238
239void nr_destroy_socket(struct sock *);
240
241
242
243
244static void nr_destroy_timer(struct timer_list *t)
245{
246 struct sock *sk = from_timer(sk, t, sk_timer);
247 bh_lock_sock(sk);
248 sock_hold(sk);
249 nr_destroy_socket(sk);
250 bh_unlock_sock(sk);
251 sock_put(sk);
252}
253
254
255
256
257
258
259
260void nr_destroy_socket(struct sock *sk)
261{
262 struct sk_buff *skb;
263
264 nr_remove_socket(sk);
265
266 nr_stop_heartbeat(sk);
267 nr_stop_t1timer(sk);
268 nr_stop_t2timer(sk);
269 nr_stop_t4timer(sk);
270 nr_stop_idletimer(sk);
271
272 nr_clear_queues(sk);
273
274 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
275 if (skb->sk != sk) {
276
277 sock_set_flag(skb->sk, SOCK_DEAD);
278 nr_start_heartbeat(skb->sk);
279 nr_sk(skb->sk)->state = NR_STATE_0;
280 }
281
282 kfree_skb(skb);
283 }
284
285 if (sk_has_allocations(sk)) {
286
287 sk->sk_timer.function = nr_destroy_timer;
288 sk->sk_timer.expires = jiffies + 2 * HZ;
289 add_timer(&sk->sk_timer);
290 } else
291 sock_put(sk);
292}
293
294
295
296
297
298
299static int nr_setsockopt(struct socket *sock, int level, int optname,
300 char __user *optval, unsigned int optlen)
301{
302 struct sock *sk = sock->sk;
303 struct nr_sock *nr = nr_sk(sk);
304 unsigned long opt;
305
306 if (level != SOL_NETROM)
307 return -ENOPROTOOPT;
308
309 if (optlen < sizeof(unsigned int))
310 return -EINVAL;
311
312 if (get_user(opt, (unsigned int __user *)optval))
313 return -EFAULT;
314
315 switch (optname) {
316 case NETROM_T1:
317 if (opt < 1 || opt > ULONG_MAX / HZ)
318 return -EINVAL;
319 nr->t1 = opt * HZ;
320 return 0;
321
322 case NETROM_T2:
323 if (opt < 1 || opt > ULONG_MAX / HZ)
324 return -EINVAL;
325 nr->t2 = opt * HZ;
326 return 0;
327
328 case NETROM_N2:
329 if (opt < 1 || opt > 31)
330 return -EINVAL;
331 nr->n2 = opt;
332 return 0;
333
334 case NETROM_T4:
335 if (opt < 1 || opt > ULONG_MAX / HZ)
336 return -EINVAL;
337 nr->t4 = opt * HZ;
338 return 0;
339
340 case NETROM_IDLE:
341 if (opt > ULONG_MAX / (60 * HZ))
342 return -EINVAL;
343 nr->idle = opt * 60 * HZ;
344 return 0;
345
346 default:
347 return -ENOPROTOOPT;
348 }
349}
350
351static int nr_getsockopt(struct socket *sock, int level, int optname,
352 char __user *optval, int __user *optlen)
353{
354 struct sock *sk = sock->sk;
355 struct nr_sock *nr = nr_sk(sk);
356 int val = 0;
357 int len;
358
359 if (level != SOL_NETROM)
360 return -ENOPROTOOPT;
361
362 if (get_user(len, optlen))
363 return -EFAULT;
364
365 if (len < 0)
366 return -EINVAL;
367
368 switch (optname) {
369 case NETROM_T1:
370 val = nr->t1 / HZ;
371 break;
372
373 case NETROM_T2:
374 val = nr->t2 / HZ;
375 break;
376
377 case NETROM_N2:
378 val = nr->n2;
379 break;
380
381 case NETROM_T4:
382 val = nr->t4 / HZ;
383 break;
384
385 case NETROM_IDLE:
386 val = nr->idle / (60 * HZ);
387 break;
388
389 default:
390 return -ENOPROTOOPT;
391 }
392
393 len = min_t(unsigned int, len, sizeof(int));
394
395 if (put_user(len, optlen))
396 return -EFAULT;
397
398 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
399}
400
401static int nr_listen(struct socket *sock, int backlog)
402{
403 struct sock *sk = sock->sk;
404
405 lock_sock(sk);
406 if (sk->sk_state != TCP_LISTEN) {
407 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
408 sk->sk_max_ack_backlog = backlog;
409 sk->sk_state = TCP_LISTEN;
410 release_sock(sk);
411 return 0;
412 }
413 release_sock(sk);
414
415 return -EOPNOTSUPP;
416}
417
418static struct proto nr_proto = {
419 .name = "NETROM",
420 .owner = THIS_MODULE,
421 .obj_size = sizeof(struct nr_sock),
422};
423
424static int nr_create(struct net *net, struct socket *sock, int protocol,
425 int kern)
426{
427 struct sock *sk;
428 struct nr_sock *nr;
429
430 if (!net_eq(net, &init_net))
431 return -EAFNOSUPPORT;
432
433 if (sock->type != SOCK_SEQPACKET || protocol != 0)
434 return -ESOCKTNOSUPPORT;
435
436 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
437 if (sk == NULL)
438 return -ENOMEM;
439
440 nr = nr_sk(sk);
441
442 sock_init_data(sock, sk);
443
444 sock->ops = &nr_proto_ops;
445 sk->sk_protocol = protocol;
446
447 skb_queue_head_init(&nr->ack_queue);
448 skb_queue_head_init(&nr->reseq_queue);
449 skb_queue_head_init(&nr->frag_queue);
450
451 nr_init_timers(sk);
452
453 nr->t1 =
454 msecs_to_jiffies(sysctl_netrom_transport_timeout);
455 nr->t2 =
456 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
457 nr->n2 =
458 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
459 nr->t4 =
460 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
461 nr->idle =
462 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
463 nr->window = sysctl_netrom_transport_requested_window_size;
464
465 nr->bpqext = 1;
466 nr->state = NR_STATE_0;
467
468 return 0;
469}
470
471static struct sock *nr_make_new(struct sock *osk)
472{
473 struct sock *sk;
474 struct nr_sock *nr, *onr;
475
476 if (osk->sk_type != SOCK_SEQPACKET)
477 return NULL;
478
479 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
480 if (sk == NULL)
481 return NULL;
482
483 nr = nr_sk(sk);
484
485 sock_init_data(NULL, sk);
486
487 sk->sk_type = osk->sk_type;
488 sk->sk_priority = osk->sk_priority;
489 sk->sk_protocol = osk->sk_protocol;
490 sk->sk_rcvbuf = osk->sk_rcvbuf;
491 sk->sk_sndbuf = osk->sk_sndbuf;
492 sk->sk_state = TCP_ESTABLISHED;
493 sock_copy_flags(sk, osk);
494
495 skb_queue_head_init(&nr->ack_queue);
496 skb_queue_head_init(&nr->reseq_queue);
497 skb_queue_head_init(&nr->frag_queue);
498
499 nr_init_timers(sk);
500
501 onr = nr_sk(osk);
502
503 nr->t1 = onr->t1;
504 nr->t2 = onr->t2;
505 nr->n2 = onr->n2;
506 nr->t4 = onr->t4;
507 nr->idle = onr->idle;
508 nr->window = onr->window;
509
510 nr->device = onr->device;
511 nr->bpqext = onr->bpqext;
512
513 return sk;
514}
515
516static int nr_release(struct socket *sock)
517{
518 struct sock *sk = sock->sk;
519 struct nr_sock *nr;
520
521 if (sk == NULL) return 0;
522
523 sock_hold(sk);
524 sock_orphan(sk);
525 lock_sock(sk);
526 nr = nr_sk(sk);
527
528 switch (nr->state) {
529 case NR_STATE_0:
530 case NR_STATE_1:
531 case NR_STATE_2:
532 nr_disconnect(sk, 0);
533 nr_destroy_socket(sk);
534 break;
535
536 case NR_STATE_3:
537 nr_clear_queues(sk);
538 nr->n2count = 0;
539 nr_write_internal(sk, NR_DISCREQ);
540 nr_start_t1timer(sk);
541 nr_stop_t2timer(sk);
542 nr_stop_t4timer(sk);
543 nr_stop_idletimer(sk);
544 nr->state = NR_STATE_2;
545 sk->sk_state = TCP_CLOSE;
546 sk->sk_shutdown |= SEND_SHUTDOWN;
547 sk->sk_state_change(sk);
548 sock_set_flag(sk, SOCK_DESTROY);
549 break;
550
551 default:
552 break;
553 }
554
555 sock->sk = NULL;
556 release_sock(sk);
557 sock_put(sk);
558
559 return 0;
560}
561
562static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
563{
564 struct sock *sk = sock->sk;
565 struct nr_sock *nr = nr_sk(sk);
566 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
567 struct net_device *dev;
568 ax25_uid_assoc *user;
569 ax25_address *source;
570
571 lock_sock(sk);
572 if (!sock_flag(sk, SOCK_ZAPPED)) {
573 release_sock(sk);
574 return -EINVAL;
575 }
576 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
577 release_sock(sk);
578 return -EINVAL;
579 }
580 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
581 release_sock(sk);
582 return -EINVAL;
583 }
584 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
585 release_sock(sk);
586 return -EINVAL;
587 }
588 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
589 release_sock(sk);
590 return -EADDRNOTAVAIL;
591 }
592
593
594
595
596 if (addr->fsa_ax25.sax25_ndigis == 1) {
597 if (!capable(CAP_NET_BIND_SERVICE)) {
598 dev_put(dev);
599 release_sock(sk);
600 return -EPERM;
601 }
602 nr->user_addr = addr->fsa_digipeater[0];
603 nr->source_addr = addr->fsa_ax25.sax25_call;
604 } else {
605 source = &addr->fsa_ax25.sax25_call;
606
607 user = ax25_findbyuid(current_euid());
608 if (user) {
609 nr->user_addr = user->call;
610 ax25_uid_put(user);
611 } else {
612 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
613 release_sock(sk);
614 dev_put(dev);
615 return -EPERM;
616 }
617 nr->user_addr = *source;
618 }
619
620 nr->source_addr = *source;
621 }
622
623 nr->device = dev;
624 nr_insert_socket(sk);
625
626 sock_reset_flag(sk, SOCK_ZAPPED);
627 dev_put(dev);
628 release_sock(sk);
629
630 return 0;
631}
632
633static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
634 int addr_len, int flags)
635{
636 struct sock *sk = sock->sk;
637 struct nr_sock *nr = nr_sk(sk);
638 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
639 ax25_address *source = NULL;
640 ax25_uid_assoc *user;
641 struct net_device *dev;
642 int err = 0;
643
644 lock_sock(sk);
645 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
646 sock->state = SS_CONNECTED;
647 goto out_release;
648 }
649
650 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
651 sock->state = SS_UNCONNECTED;
652 err = -ECONNREFUSED;
653 goto out_release;
654 }
655
656 if (sk->sk_state == TCP_ESTABLISHED) {
657 err = -EISCONN;
658 goto out_release;
659 }
660
661 sk->sk_state = TCP_CLOSE;
662 sock->state = SS_UNCONNECTED;
663
664 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
665 err = -EINVAL;
666 goto out_release;
667 }
668 if (addr->sax25_family != AF_NETROM) {
669 err = -EINVAL;
670 goto out_release;
671 }
672 if (sock_flag(sk, SOCK_ZAPPED)) {
673 sock_reset_flag(sk, SOCK_ZAPPED);
674
675 if ((dev = nr_dev_first()) == NULL) {
676 err = -ENETUNREACH;
677 goto out_release;
678 }
679 source = (ax25_address *)dev->dev_addr;
680
681 user = ax25_findbyuid(current_euid());
682 if (user) {
683 nr->user_addr = user->call;
684 ax25_uid_put(user);
685 } else {
686 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
687 dev_put(dev);
688 err = -EPERM;
689 goto out_release;
690 }
691 nr->user_addr = *source;
692 }
693
694 nr->source_addr = *source;
695 nr->device = dev;
696
697 dev_put(dev);
698 nr_insert_socket(sk);
699 }
700
701 nr->dest_addr = addr->sax25_call;
702
703 release_sock(sk);
704 circuit = nr_find_next_circuit();
705 lock_sock(sk);
706
707 nr->my_index = circuit / 256;
708 nr->my_id = circuit % 256;
709
710 circuit++;
711
712
713 sock->state = SS_CONNECTING;
714 sk->sk_state = TCP_SYN_SENT;
715
716 nr_establish_data_link(sk);
717
718 nr->state = NR_STATE_1;
719
720 nr_start_heartbeat(sk);
721
722
723 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
724 err = -EINPROGRESS;
725 goto out_release;
726 }
727
728
729
730
731
732 if (sk->sk_state == TCP_SYN_SENT) {
733 DEFINE_WAIT(wait);
734
735 for (;;) {
736 prepare_to_wait(sk_sleep(sk), &wait,
737 TASK_INTERRUPTIBLE);
738 if (sk->sk_state != TCP_SYN_SENT)
739 break;
740 if (!signal_pending(current)) {
741 release_sock(sk);
742 schedule();
743 lock_sock(sk);
744 continue;
745 }
746 err = -ERESTARTSYS;
747 break;
748 }
749 finish_wait(sk_sleep(sk), &wait);
750 if (err)
751 goto out_release;
752 }
753
754 if (sk->sk_state != TCP_ESTABLISHED) {
755 sock->state = SS_UNCONNECTED;
756 err = sock_error(sk);
757 goto out_release;
758 }
759
760 sock->state = SS_CONNECTED;
761
762out_release:
763 release_sock(sk);
764
765 return err;
766}
767
768static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
769 bool kern)
770{
771 struct sk_buff *skb;
772 struct sock *newsk;
773 DEFINE_WAIT(wait);
774 struct sock *sk;
775 int err = 0;
776
777 if ((sk = sock->sk) == NULL)
778 return -EINVAL;
779
780 lock_sock(sk);
781 if (sk->sk_type != SOCK_SEQPACKET) {
782 err = -EOPNOTSUPP;
783 goto out_release;
784 }
785
786 if (sk->sk_state != TCP_LISTEN) {
787 err = -EINVAL;
788 goto out_release;
789 }
790
791
792
793
794
795 for (;;) {
796 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
797 skb = skb_dequeue(&sk->sk_receive_queue);
798 if (skb)
799 break;
800
801 if (flags & O_NONBLOCK) {
802 err = -EWOULDBLOCK;
803 break;
804 }
805 if (!signal_pending(current)) {
806 release_sock(sk);
807 schedule();
808 lock_sock(sk);
809 continue;
810 }
811 err = -ERESTARTSYS;
812 break;
813 }
814 finish_wait(sk_sleep(sk), &wait);
815 if (err)
816 goto out_release;
817
818 newsk = skb->sk;
819 sock_graft(newsk, newsock);
820
821
822 kfree_skb(skb);
823 sk_acceptq_removed(sk);
824
825out_release:
826 release_sock(sk);
827
828 return err;
829}
830
831static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
832 int peer)
833{
834 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
835 struct sock *sk = sock->sk;
836 struct nr_sock *nr = nr_sk(sk);
837 int uaddr_len;
838
839 memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
840
841 lock_sock(sk);
842 if (peer != 0) {
843 if (sk->sk_state != TCP_ESTABLISHED) {
844 release_sock(sk);
845 return -ENOTCONN;
846 }
847 sax->fsa_ax25.sax25_family = AF_NETROM;
848 sax->fsa_ax25.sax25_ndigis = 1;
849 sax->fsa_ax25.sax25_call = nr->user_addr;
850 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
851 sax->fsa_digipeater[0] = nr->dest_addr;
852 uaddr_len = sizeof(struct full_sockaddr_ax25);
853 } else {
854 sax->fsa_ax25.sax25_family = AF_NETROM;
855 sax->fsa_ax25.sax25_ndigis = 0;
856 sax->fsa_ax25.sax25_call = nr->source_addr;
857 uaddr_len = sizeof(struct sockaddr_ax25);
858 }
859 release_sock(sk);
860
861 return uaddr_len;
862}
863
864int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
865{
866 struct sock *sk;
867 struct sock *make;
868 struct nr_sock *nr_make;
869 ax25_address *src, *dest, *user;
870 unsigned short circuit_index, circuit_id;
871 unsigned short peer_circuit_index, peer_circuit_id;
872 unsigned short frametype, flags, window, timeout;
873 int ret;
874
875 skb->sk = NULL;
876
877
878
879
880
881 src = (ax25_address *)(skb->data + 0);
882 dest = (ax25_address *)(skb->data + 7);
883
884 circuit_index = skb->data[15];
885 circuit_id = skb->data[16];
886 peer_circuit_index = skb->data[17];
887 peer_circuit_id = skb->data[18];
888 frametype = skb->data[19] & 0x0F;
889 flags = skb->data[19] & 0xF0;
890
891
892
893
894 if (frametype == NR_PROTOEXT &&
895 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
896 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
897 skb_reset_transport_header(skb);
898
899 return nr_rx_ip(skb, dev);
900 }
901
902
903
904
905
906
907
908
909
910 sk = NULL;
911
912 if (circuit_index == 0 && circuit_id == 0) {
913 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
914 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
915 } else {
916 if (frametype == NR_CONNREQ)
917 sk = nr_find_peer(circuit_index, circuit_id, src);
918 else
919 sk = nr_find_socket(circuit_index, circuit_id);
920 }
921
922 if (sk != NULL) {
923 bh_lock_sock(sk);
924 skb_reset_transport_header(skb);
925
926 if (frametype == NR_CONNACK && skb->len == 22)
927 nr_sk(sk)->bpqext = 1;
928 else
929 nr_sk(sk)->bpqext = 0;
930
931 ret = nr_process_rx_frame(sk, skb);
932 bh_unlock_sock(sk);
933 sock_put(sk);
934 return ret;
935 }
936
937
938
939
940 if (frametype != NR_CONNREQ) {
941
942
943
944
945
946
947
948
949
950 if (sysctl_netrom_reset_circuit &&
951 (frametype != NR_RESET || flags != 0))
952 nr_transmit_reset(skb, 1);
953
954 return 0;
955 }
956
957 sk = nr_find_listener(dest);
958
959 user = (ax25_address *)(skb->data + 21);
960
961 if (sk == NULL || sk_acceptq_is_full(sk) ||
962 (make = nr_make_new(sk)) == NULL) {
963 nr_transmit_refusal(skb, 0);
964 if (sk)
965 sock_put(sk);
966 return 0;
967 }
968
969 bh_lock_sock(sk);
970
971 window = skb->data[20];
972
973 skb->sk = make;
974 make->sk_state = TCP_ESTABLISHED;
975
976
977 nr_make = nr_sk(make);
978 nr_make->source_addr = *dest;
979 nr_make->dest_addr = *src;
980 nr_make->user_addr = *user;
981
982 nr_make->your_index = circuit_index;
983 nr_make->your_id = circuit_id;
984
985 bh_unlock_sock(sk);
986 circuit = nr_find_next_circuit();
987 bh_lock_sock(sk);
988
989 nr_make->my_index = circuit / 256;
990 nr_make->my_id = circuit % 256;
991
992 circuit++;
993
994
995 if (window < nr_make->window)
996 nr_make->window = window;
997
998
999 if (skb->len == 37) {
1000 timeout = skb->data[36] * 256 + skb->data[35];
1001 if (timeout * HZ < nr_make->t1)
1002 nr_make->t1 = timeout * HZ;
1003 nr_make->bpqext = 1;
1004 } else {
1005 nr_make->bpqext = 0;
1006 }
1007
1008 nr_write_internal(make, NR_CONNACK);
1009
1010 nr_make->condition = 0x00;
1011 nr_make->vs = 0;
1012 nr_make->va = 0;
1013 nr_make->vr = 0;
1014 nr_make->vl = 0;
1015 nr_make->state = NR_STATE_3;
1016 sk_acceptq_added(sk);
1017 skb_queue_head(&sk->sk_receive_queue, skb);
1018
1019 if (!sock_flag(sk, SOCK_DEAD))
1020 sk->sk_data_ready(sk);
1021
1022 bh_unlock_sock(sk);
1023 sock_put(sk);
1024
1025 nr_insert_socket(make);
1026
1027 nr_start_heartbeat(make);
1028 nr_start_idletimer(make);
1029
1030 return 1;
1031}
1032
1033static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1034{
1035 struct sock *sk = sock->sk;
1036 struct nr_sock *nr = nr_sk(sk);
1037 DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1038 int err;
1039 struct sockaddr_ax25 sax;
1040 struct sk_buff *skb;
1041 unsigned char *asmptr;
1042 int size;
1043
1044 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1045 return -EINVAL;
1046
1047 lock_sock(sk);
1048 if (sock_flag(sk, SOCK_ZAPPED)) {
1049 err = -EADDRNOTAVAIL;
1050 goto out;
1051 }
1052
1053 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1054 send_sig(SIGPIPE, current, 0);
1055 err = -EPIPE;
1056 goto out;
1057 }
1058
1059 if (nr->device == NULL) {
1060 err = -ENETUNREACH;
1061 goto out;
1062 }
1063
1064 if (usax) {
1065 if (msg->msg_namelen < sizeof(sax)) {
1066 err = -EINVAL;
1067 goto out;
1068 }
1069 sax = *usax;
1070 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1071 err = -EISCONN;
1072 goto out;
1073 }
1074 if (sax.sax25_family != AF_NETROM) {
1075 err = -EINVAL;
1076 goto out;
1077 }
1078 } else {
1079 if (sk->sk_state != TCP_ESTABLISHED) {
1080 err = -ENOTCONN;
1081 goto out;
1082 }
1083 sax.sax25_family = AF_NETROM;
1084 sax.sax25_call = nr->dest_addr;
1085 }
1086
1087
1088
1089 if (len > 65536) {
1090 err = -EMSGSIZE;
1091 goto out;
1092 }
1093
1094 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1095
1096 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1097 goto out;
1098
1099 skb_reserve(skb, size - len);
1100 skb_reset_transport_header(skb);
1101
1102
1103
1104
1105
1106 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1107
1108
1109
1110 *asmptr++ = nr->your_index;
1111 *asmptr++ = nr->your_id;
1112 *asmptr++ = 0;
1113 *asmptr++ = 0;
1114 *asmptr++ = NR_INFO;
1115
1116
1117
1118
1119 skb_put(skb, len);
1120
1121
1122 if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1123 kfree_skb(skb);
1124 err = -EFAULT;
1125 goto out;
1126 }
1127
1128 if (sk->sk_state != TCP_ESTABLISHED) {
1129 kfree_skb(skb);
1130 err = -ENOTCONN;
1131 goto out;
1132 }
1133
1134 nr_output(sk, skb);
1135
1136 err = len;
1137out:
1138 release_sock(sk);
1139 return err;
1140}
1141
1142static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1143 int flags)
1144{
1145 struct sock *sk = sock->sk;
1146 DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1147 size_t copied;
1148 struct sk_buff *skb;
1149 int er;
1150
1151
1152
1153
1154
1155
1156 lock_sock(sk);
1157 if (sk->sk_state != TCP_ESTABLISHED) {
1158 release_sock(sk);
1159 return -ENOTCONN;
1160 }
1161
1162
1163 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1164 release_sock(sk);
1165 return er;
1166 }
1167
1168 skb_reset_transport_header(skb);
1169 copied = skb->len;
1170
1171 if (copied > size) {
1172 copied = size;
1173 msg->msg_flags |= MSG_TRUNC;
1174 }
1175
1176 er = skb_copy_datagram_msg(skb, 0, msg, copied);
1177 if (er < 0) {
1178 skb_free_datagram(sk, skb);
1179 release_sock(sk);
1180 return er;
1181 }
1182
1183 if (sax != NULL) {
1184 memset(sax, 0, sizeof(*sax));
1185 sax->sax25_family = AF_NETROM;
1186 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1187 AX25_ADDR_LEN);
1188 msg->msg_namelen = sizeof(*sax);
1189 }
1190
1191 skb_free_datagram(sk, skb);
1192
1193 release_sock(sk);
1194 return copied;
1195}
1196
1197
1198static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1199{
1200 struct sock *sk = sock->sk;
1201 void __user *argp = (void __user *)arg;
1202 int ret;
1203
1204 switch (cmd) {
1205 case TIOCOUTQ: {
1206 long amount;
1207
1208 lock_sock(sk);
1209 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1210 if (amount < 0)
1211 amount = 0;
1212 release_sock(sk);
1213 return put_user(amount, (int __user *)argp);
1214 }
1215
1216 case TIOCINQ: {
1217 struct sk_buff *skb;
1218 long amount = 0L;
1219
1220 lock_sock(sk);
1221
1222 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1223 amount = skb->len;
1224 release_sock(sk);
1225 return put_user(amount, (int __user *)argp);
1226 }
1227
1228 case SIOCGSTAMP:
1229 lock_sock(sk);
1230 ret = sock_get_timestamp(sk, argp);
1231 release_sock(sk);
1232 return ret;
1233
1234 case SIOCGSTAMPNS:
1235 lock_sock(sk);
1236 ret = sock_get_timestampns(sk, argp);
1237 release_sock(sk);
1238 return ret;
1239
1240 case SIOCGIFADDR:
1241 case SIOCSIFADDR:
1242 case SIOCGIFDSTADDR:
1243 case SIOCSIFDSTADDR:
1244 case SIOCGIFBRDADDR:
1245 case SIOCSIFBRDADDR:
1246 case SIOCGIFNETMASK:
1247 case SIOCSIFNETMASK:
1248 case SIOCGIFMETRIC:
1249 case SIOCSIFMETRIC:
1250 return -EINVAL;
1251
1252 case SIOCADDRT:
1253 case SIOCDELRT:
1254 case SIOCNRDECOBS:
1255 if (!capable(CAP_NET_ADMIN))
1256 return -EPERM;
1257 return nr_rt_ioctl(cmd, argp);
1258
1259 default:
1260 return -ENOIOCTLCMD;
1261 }
1262
1263 return 0;
1264}
1265
1266#ifdef CONFIG_PROC_FS
1267
1268static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1269{
1270 spin_lock_bh(&nr_list_lock);
1271 return seq_hlist_start_head(&nr_list, *pos);
1272}
1273
1274static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1275{
1276 return seq_hlist_next(v, &nr_list, pos);
1277}
1278
1279static void nr_info_stop(struct seq_file *seq, void *v)
1280{
1281 spin_unlock_bh(&nr_list_lock);
1282}
1283
1284static int nr_info_show(struct seq_file *seq, void *v)
1285{
1286 struct sock *s = sk_entry(v);
1287 struct net_device *dev;
1288 struct nr_sock *nr;
1289 const char *devname;
1290 char buf[11];
1291
1292 if (v == SEQ_START_TOKEN)
1293 seq_puts(seq,
1294"user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n");
1295
1296 else {
1297
1298 bh_lock_sock(s);
1299 nr = nr_sk(s);
1300
1301 if ((dev = nr->device) == NULL)
1302 devname = "???";
1303 else
1304 devname = dev->name;
1305
1306 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1307 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1308 seq_printf(seq,
1309"%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n",
1310 ax2asc(buf, &nr->source_addr),
1311 devname,
1312 nr->my_index,
1313 nr->my_id,
1314 nr->your_index,
1315 nr->your_id,
1316 nr->state,
1317 nr->vs,
1318 nr->vr,
1319 nr->va,
1320 ax25_display_timer(&nr->t1timer) / HZ,
1321 nr->t1 / HZ,
1322 ax25_display_timer(&nr->t2timer) / HZ,
1323 nr->t2 / HZ,
1324 ax25_display_timer(&nr->t4timer) / HZ,
1325 nr->t4 / HZ,
1326 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1327 nr->idle / (60 * HZ),
1328 nr->n2count,
1329 nr->n2,
1330 nr->window,
1331 sk_wmem_alloc_get(s),
1332 sk_rmem_alloc_get(s),
1333 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1334
1335 bh_unlock_sock(s);
1336 }
1337 return 0;
1338}
1339
1340static const struct seq_operations nr_info_seqops = {
1341 .start = nr_info_start,
1342 .next = nr_info_next,
1343 .stop = nr_info_stop,
1344 .show = nr_info_show,
1345};
1346#endif
1347
1348static const struct net_proto_family nr_family_ops = {
1349 .family = PF_NETROM,
1350 .create = nr_create,
1351 .owner = THIS_MODULE,
1352};
1353
1354static const struct proto_ops nr_proto_ops = {
1355 .family = PF_NETROM,
1356 .owner = THIS_MODULE,
1357 .release = nr_release,
1358 .bind = nr_bind,
1359 .connect = nr_connect,
1360 .socketpair = sock_no_socketpair,
1361 .accept = nr_accept,
1362 .getname = nr_getname,
1363 .poll = datagram_poll,
1364 .ioctl = nr_ioctl,
1365 .listen = nr_listen,
1366 .shutdown = sock_no_shutdown,
1367 .setsockopt = nr_setsockopt,
1368 .getsockopt = nr_getsockopt,
1369 .sendmsg = nr_sendmsg,
1370 .recvmsg = nr_recvmsg,
1371 .mmap = sock_no_mmap,
1372 .sendpage = sock_no_sendpage,
1373};
1374
1375static struct notifier_block nr_dev_notifier = {
1376 .notifier_call = nr_device_event,
1377};
1378
1379static struct net_device **dev_nr;
1380
1381static struct ax25_protocol nr_pid = {
1382 .pid = AX25_P_NETROM,
1383 .func = nr_route_frame
1384};
1385
1386static struct ax25_linkfail nr_linkfail_notifier = {
1387 .func = nr_link_failed,
1388};
1389
1390static int __init nr_proto_init(void)
1391{
1392 int i;
1393 int rc = proto_register(&nr_proto, 0);
1394
1395 if (rc)
1396 return rc;
1397
1398 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1399 pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1400 __func__);
1401 rc = -EINVAL;
1402 goto unregister_proto;
1403 }
1404
1405 dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1406 if (!dev_nr) {
1407 pr_err("NET/ROM: %s - unable to allocate device array\n",
1408 __func__);
1409 rc = -ENOMEM;
1410 goto unregister_proto;
1411 }
1412
1413 for (i = 0; i < nr_ndevs; i++) {
1414 char name[IFNAMSIZ];
1415 struct net_device *dev;
1416
1417 sprintf(name, "nr%d", i);
1418 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1419 if (!dev) {
1420 rc = -ENOMEM;
1421 goto fail;
1422 }
1423
1424 dev->base_addr = i;
1425 rc = register_netdev(dev);
1426 if (rc) {
1427 free_netdev(dev);
1428 goto fail;
1429 }
1430 nr_set_lockdep_key(dev);
1431 dev_nr[i] = dev;
1432 }
1433
1434 rc = sock_register(&nr_family_ops);
1435 if (rc)
1436 goto fail;
1437
1438 rc = register_netdevice_notifier(&nr_dev_notifier);
1439 if (rc)
1440 goto out_sock;
1441
1442 ax25_register_pid(&nr_pid);
1443 ax25_linkfail_register(&nr_linkfail_notifier);
1444
1445#ifdef CONFIG_SYSCTL
1446 rc = nr_register_sysctl();
1447 if (rc)
1448 goto out_sysctl;
1449#endif
1450
1451 nr_loopback_init();
1452
1453 rc = -ENOMEM;
1454 if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1455 goto proc_remove1;
1456 if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1457 &nr_neigh_seqops))
1458 goto proc_remove2;
1459 if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1460 &nr_node_seqops))
1461 goto proc_remove3;
1462
1463 return 0;
1464
1465proc_remove3:
1466 remove_proc_entry("nr_neigh", init_net.proc_net);
1467proc_remove2:
1468 remove_proc_entry("nr", init_net.proc_net);
1469proc_remove1:
1470
1471 nr_loopback_clear();
1472 nr_rt_free();
1473
1474#ifdef CONFIG_SYSCTL
1475 nr_unregister_sysctl();
1476out_sysctl:
1477#endif
1478 ax25_linkfail_release(&nr_linkfail_notifier);
1479 ax25_protocol_release(AX25_P_NETROM);
1480 unregister_netdevice_notifier(&nr_dev_notifier);
1481out_sock:
1482 sock_unregister(PF_NETROM);
1483fail:
1484 while (--i >= 0) {
1485 unregister_netdev(dev_nr[i]);
1486 free_netdev(dev_nr[i]);
1487 }
1488 kfree(dev_nr);
1489unregister_proto:
1490 proto_unregister(&nr_proto);
1491 return rc;
1492}
1493
1494module_init(nr_proto_init);
1495
1496module_param(nr_ndevs, int, 0);
1497MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1498
1499MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1500MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1501MODULE_LICENSE("GPL");
1502MODULE_ALIAS_NETPROTO(PF_NETROM);
1503
1504static void __exit nr_exit(void)
1505{
1506 int i;
1507
1508 remove_proc_entry("nr", init_net.proc_net);
1509 remove_proc_entry("nr_neigh", init_net.proc_net);
1510 remove_proc_entry("nr_nodes", init_net.proc_net);
1511 nr_loopback_clear();
1512
1513 nr_rt_free();
1514
1515#ifdef CONFIG_SYSCTL
1516 nr_unregister_sysctl();
1517#endif
1518
1519 ax25_linkfail_release(&nr_linkfail_notifier);
1520 ax25_protocol_release(AX25_P_NETROM);
1521
1522 unregister_netdevice_notifier(&nr_dev_notifier);
1523
1524 sock_unregister(PF_NETROM);
1525
1526 for (i = 0; i < nr_ndevs; i++) {
1527 struct net_device *dev = dev_nr[i];
1528 if (dev) {
1529 unregister_netdev(dev);
1530 free_netdev(dev);
1531 }
1532 }
1533
1534 kfree(dev_nr);
1535 proto_unregister(&nr_proto);
1536}
1537module_exit(nr_exit);
1538
