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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/kernel.h>
19#include <linux/sched.h>
20#include <linux/timer.h>
21#include <linux/string.h>
22#include <linux/sockios.h>
23#include <linux/net.h>
24#include <linux/stat.h>
25#include <net/ax25.h>
26#include <linux/inet.h>
27#include <linux/netdevice.h>
28#include <linux/if_arp.h>
29#include <linux/skbuff.h>
30#include <net/net_namespace.h>
31#include <net/sock.h>
32#include <asm/uaccess.h>
33#include <asm/system.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 struct hlist_node *node;
108
109 spin_lock_bh(&nr_list_lock);
110 sk_for_each(s, node, &nr_list)
111 if (nr_sk(s)->device == dev)
112 nr_disconnect(s, ENETUNREACH);
113 spin_unlock_bh(&nr_list_lock);
114}
115
116
117
118
119static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
120{
121 struct net_device *dev = (struct net_device *)ptr;
122
123 if (!net_eq(dev_net(dev), &init_net))
124 return NOTIFY_DONE;
125
126 if (event != NETDEV_DOWN)
127 return NOTIFY_DONE;
128
129 nr_kill_by_device(dev);
130 nr_rt_device_down(dev);
131
132 return NOTIFY_DONE;
133}
134
135
136
137
138static void nr_insert_socket(struct sock *sk)
139{
140 spin_lock_bh(&nr_list_lock);
141 sk_add_node(sk, &nr_list);
142 spin_unlock_bh(&nr_list_lock);
143}
144
145
146
147
148
149static struct sock *nr_find_listener(ax25_address *addr)
150{
151 struct sock *s;
152 struct hlist_node *node;
153
154 spin_lock_bh(&nr_list_lock);
155 sk_for_each(s, node, &nr_list)
156 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
157 s->sk_state == TCP_LISTEN) {
158 bh_lock_sock(s);
159 goto found;
160 }
161 s = NULL;
162found:
163 spin_unlock_bh(&nr_list_lock);
164 return s;
165}
166
167
168
169
170static struct sock *nr_find_socket(unsigned char index, unsigned char id)
171{
172 struct sock *s;
173 struct hlist_node *node;
174
175 spin_lock_bh(&nr_list_lock);
176 sk_for_each(s, node, &nr_list) {
177 struct nr_sock *nr = nr_sk(s);
178
179 if (nr->my_index == index && nr->my_id == id) {
180 bh_lock_sock(s);
181 goto found;
182 }
183 }
184 s = NULL;
185found:
186 spin_unlock_bh(&nr_list_lock);
187 return s;
188}
189
190
191
192
193static struct sock *nr_find_peer(unsigned char index, unsigned char id,
194 ax25_address *dest)
195{
196 struct sock *s;
197 struct hlist_node *node;
198
199 spin_lock_bh(&nr_list_lock);
200 sk_for_each(s, node, &nr_list) {
201 struct nr_sock *nr = nr_sk(s);
202
203 if (nr->your_index == index && nr->your_id == id &&
204 !ax25cmp(&nr->dest_addr, dest)) {
205 bh_lock_sock(s);
206 goto found;
207 }
208 }
209 s = NULL;
210found:
211 spin_unlock_bh(&nr_list_lock);
212 return s;
213}
214
215
216
217
218static unsigned short nr_find_next_circuit(void)
219{
220 unsigned short id = circuit;
221 unsigned char i, j;
222 struct sock *sk;
223
224 for (;;) {
225 i = id / 256;
226 j = id % 256;
227
228 if (i != 0 && j != 0) {
229 if ((sk=nr_find_socket(i, j)) == NULL)
230 break;
231 bh_unlock_sock(sk);
232 }
233
234 id++;
235 }
236
237 return id;
238}
239
240
241
242
243void nr_destroy_socket(struct sock *);
244
245
246
247
248static void nr_destroy_timer(unsigned long data)
249{
250 struct sock *sk=(struct sock *)data;
251 bh_lock_sock(sk);
252 sock_hold(sk);
253 nr_destroy_socket(sk);
254 bh_unlock_sock(sk);
255 sock_put(sk);
256}
257
258
259
260
261
262
263
264void nr_destroy_socket(struct sock *sk)
265{
266 struct sk_buff *skb;
267
268 nr_remove_socket(sk);
269
270 nr_stop_heartbeat(sk);
271 nr_stop_t1timer(sk);
272 nr_stop_t2timer(sk);
273 nr_stop_t4timer(sk);
274 nr_stop_idletimer(sk);
275
276 nr_clear_queues(sk);
277
278 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
279 if (skb->sk != sk) {
280
281 sock_set_flag(skb->sk, SOCK_DEAD);
282 nr_start_heartbeat(skb->sk);
283 nr_sk(skb->sk)->state = NR_STATE_0;
284 }
285
286 kfree_skb(skb);
287 }
288
289 if (sk_has_allocations(sk)) {
290
291 sk->sk_timer.function = nr_destroy_timer;
292 sk->sk_timer.expires = jiffies + 2 * HZ;
293 add_timer(&sk->sk_timer);
294 } else
295 sock_put(sk);
296}
297
298
299
300
301
302
303static int nr_setsockopt(struct socket *sock, int level, int optname,
304 char __user *optval, unsigned int optlen)
305{
306 struct sock *sk = sock->sk;
307 struct nr_sock *nr = nr_sk(sk);
308 int opt;
309
310 if (level != SOL_NETROM)
311 return -ENOPROTOOPT;
312
313 if (optlen < sizeof(int))
314 return -EINVAL;
315
316 if (get_user(opt, (int __user *)optval))
317 return -EFAULT;
318
319 switch (optname) {
320 case NETROM_T1:
321 if (opt < 1)
322 return -EINVAL;
323 nr->t1 = opt * HZ;
324 return 0;
325
326 case NETROM_T2:
327 if (opt < 1)
328 return -EINVAL;
329 nr->t2 = opt * HZ;
330 return 0;
331
332 case NETROM_N2:
333 if (opt < 1 || opt > 31)
334 return -EINVAL;
335 nr->n2 = opt;
336 return 0;
337
338 case NETROM_T4:
339 if (opt < 1)
340 return -EINVAL;
341 nr->t4 = opt * HZ;
342 return 0;
343
344 case NETROM_IDLE:
345 if (opt < 0)
346 return -EINVAL;
347 nr->idle = opt * 60 * HZ;
348 return 0;
349
350 default:
351 return -ENOPROTOOPT;
352 }
353}
354
355static int nr_getsockopt(struct socket *sock, int level, int optname,
356 char __user *optval, int __user *optlen)
357{
358 struct sock *sk = sock->sk;
359 struct nr_sock *nr = nr_sk(sk);
360 int val = 0;
361 int len;
362
363 if (level != SOL_NETROM)
364 return -ENOPROTOOPT;
365
366 if (get_user(len, optlen))
367 return -EFAULT;
368
369 if (len < 0)
370 return -EINVAL;
371
372 switch (optname) {
373 case NETROM_T1:
374 val = nr->t1 / HZ;
375 break;
376
377 case NETROM_T2:
378 val = nr->t2 / HZ;
379 break;
380
381 case NETROM_N2:
382 val = nr->n2;
383 break;
384
385 case NETROM_T4:
386 val = nr->t4 / HZ;
387 break;
388
389 case NETROM_IDLE:
390 val = nr->idle / (60 * HZ);
391 break;
392
393 default:
394 return -ENOPROTOOPT;
395 }
396
397 len = min_t(unsigned int, len, sizeof(int));
398
399 if (put_user(len, optlen))
400 return -EFAULT;
401
402 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
403}
404
405static int nr_listen(struct socket *sock, int backlog)
406{
407 struct sock *sk = sock->sk;
408
409 lock_sock(sk);
410 if (sk->sk_state != TCP_LISTEN) {
411 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
412 sk->sk_max_ack_backlog = backlog;
413 sk->sk_state = TCP_LISTEN;
414 release_sock(sk);
415 return 0;
416 }
417 release_sock(sk);
418
419 return -EOPNOTSUPP;
420}
421
422static struct proto nr_proto = {
423 .name = "NETROM",
424 .owner = THIS_MODULE,
425 .obj_size = sizeof(struct nr_sock),
426};
427
428static int nr_create(struct net *net, struct socket *sock, int protocol)
429{
430 struct sock *sk;
431 struct nr_sock *nr;
432
433 if (net != &init_net)
434 return -EAFNOSUPPORT;
435
436 if (sock->type != SOCK_SEQPACKET || protocol != 0)
437 return -ESOCKTNOSUPPORT;
438
439 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
440 if (sk == NULL)
441 return -ENOMEM;
442
443 nr = nr_sk(sk);
444
445 sock_init_data(sock, sk);
446
447 sock->ops = &nr_proto_ops;
448 sk->sk_protocol = protocol;
449
450 skb_queue_head_init(&nr->ack_queue);
451 skb_queue_head_init(&nr->reseq_queue);
452 skb_queue_head_init(&nr->frag_queue);
453
454 nr_init_timers(sk);
455
456 nr->t1 =
457 msecs_to_jiffies(sysctl_netrom_transport_timeout);
458 nr->t2 =
459 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
460 nr->n2 =
461 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
462 nr->t4 =
463 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
464 nr->idle =
465 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
466 nr->window = sysctl_netrom_transport_requested_window_size;
467
468 nr->bpqext = 1;
469 nr->state = NR_STATE_0;
470
471 return 0;
472}
473
474static struct sock *nr_make_new(struct sock *osk)
475{
476 struct sock *sk;
477 struct nr_sock *nr, *onr;
478
479 if (osk->sk_type != SOCK_SEQPACKET)
480 return NULL;
481
482 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
483 if (sk == NULL)
484 return NULL;
485
486 nr = nr_sk(sk);
487
488 sock_init_data(NULL, sk);
489
490 sk->sk_type = osk->sk_type;
491 sk->sk_priority = osk->sk_priority;
492 sk->sk_protocol = osk->sk_protocol;
493 sk->sk_rcvbuf = osk->sk_rcvbuf;
494 sk->sk_sndbuf = osk->sk_sndbuf;
495 sk->sk_state = TCP_ESTABLISHED;
496 sock_copy_flags(sk, osk);
497
498 skb_queue_head_init(&nr->ack_queue);
499 skb_queue_head_init(&nr->reseq_queue);
500 skb_queue_head_init(&nr->frag_queue);
501
502 nr_init_timers(sk);
503
504 onr = nr_sk(osk);
505
506 nr->t1 = onr->t1;
507 nr->t2 = onr->t2;
508 nr->n2 = onr->n2;
509 nr->t4 = onr->t4;
510 nr->idle = onr->idle;
511 nr->window = onr->window;
512
513 nr->device = onr->device;
514 nr->bpqext = onr->bpqext;
515
516 return sk;
517}
518
519static int nr_release(struct socket *sock)
520{
521 struct sock *sk = sock->sk;
522 struct nr_sock *nr;
523
524 if (sk == NULL) return 0;
525
526 sock_hold(sk);
527 sock_orphan(sk);
528 lock_sock(sk);
529 nr = nr_sk(sk);
530
531 switch (nr->state) {
532 case NR_STATE_0:
533 case NR_STATE_1:
534 case NR_STATE_2:
535 nr_disconnect(sk, 0);
536 nr_destroy_socket(sk);
537 break;
538
539 case NR_STATE_3:
540 nr_clear_queues(sk);
541 nr->n2count = 0;
542 nr_write_internal(sk, NR_DISCREQ);
543 nr_start_t1timer(sk);
544 nr_stop_t2timer(sk);
545 nr_stop_t4timer(sk);
546 nr_stop_idletimer(sk);
547 nr->state = NR_STATE_2;
548 sk->sk_state = TCP_CLOSE;
549 sk->sk_shutdown |= SEND_SHUTDOWN;
550 sk->sk_state_change(sk);
551 sock_set_flag(sk, SOCK_DESTROY);
552 break;
553
554 default:
555 break;
556 }
557
558 sock->sk = NULL;
559 release_sock(sk);
560 sock_put(sk);
561
562 return 0;
563}
564
565static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
566{
567 struct sock *sk = sock->sk;
568 struct nr_sock *nr = nr_sk(sk);
569 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
570 struct net_device *dev;
571 ax25_uid_assoc *user;
572 ax25_address *source;
573
574 lock_sock(sk);
575 if (!sock_flag(sk, SOCK_ZAPPED)) {
576 release_sock(sk);
577 return -EINVAL;
578 }
579 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
580 release_sock(sk);
581 return -EINVAL;
582 }
583 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
584 release_sock(sk);
585 return -EINVAL;
586 }
587 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
588 release_sock(sk);
589 return -EINVAL;
590 }
591 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
592 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
593 release_sock(sk);
594 return -EADDRNOTAVAIL;
595 }
596
597
598
599
600 if (addr->fsa_ax25.sax25_ndigis == 1) {
601 if (!capable(CAP_NET_BIND_SERVICE)) {
602 dev_put(dev);
603 release_sock(sk);
604 return -EACCES;
605 }
606 nr->user_addr = addr->fsa_digipeater[0];
607 nr->source_addr = addr->fsa_ax25.sax25_call;
608 } else {
609 source = &addr->fsa_ax25.sax25_call;
610
611 user = ax25_findbyuid(current_euid());
612 if (user) {
613 nr->user_addr = user->call;
614 ax25_uid_put(user);
615 } else {
616 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
617 release_sock(sk);
618 dev_put(dev);
619 return -EPERM;
620 }
621 nr->user_addr = *source;
622 }
623
624 nr->source_addr = *source;
625 }
626
627 nr->device = dev;
628 nr_insert_socket(sk);
629
630 sock_reset_flag(sk, SOCK_ZAPPED);
631 dev_put(dev);
632 release_sock(sk);
633 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
634 return 0;
635}
636
637static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
638 int addr_len, int flags)
639{
640 struct sock *sk = sock->sk;
641 struct nr_sock *nr = nr_sk(sk);
642 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
643 ax25_address *source = NULL;
644 ax25_uid_assoc *user;
645 struct net_device *dev;
646 int err = 0;
647
648 lock_sock(sk);
649 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
650 sock->state = SS_CONNECTED;
651 goto out_release;
652 }
653
654 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
655 sock->state = SS_UNCONNECTED;
656 err = -ECONNREFUSED;
657 goto out_release;
658 }
659
660 if (sk->sk_state == TCP_ESTABLISHED) {
661 err = -EISCONN;
662 goto out_release;
663 }
664
665 sk->sk_state = TCP_CLOSE;
666 sock->state = SS_UNCONNECTED;
667
668 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
669 err = -EINVAL;
670 goto out_release;
671 }
672 if (addr->sax25_family != AF_NETROM) {
673 err = -EINVAL;
674 goto out_release;
675 }
676 if (sock_flag(sk, SOCK_ZAPPED)) {
677 sock_reset_flag(sk, SOCK_ZAPPED);
678
679 if ((dev = nr_dev_first()) == NULL) {
680 err = -ENETUNREACH;
681 goto out_release;
682 }
683 source = (ax25_address *)dev->dev_addr;
684
685 user = ax25_findbyuid(current_euid());
686 if (user) {
687 nr->user_addr = user->call;
688 ax25_uid_put(user);
689 } else {
690 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
691 dev_put(dev);
692 err = -EPERM;
693 goto out_release;
694 }
695 nr->user_addr = *source;
696 }
697
698 nr->source_addr = *source;
699 nr->device = dev;
700
701 dev_put(dev);
702 nr_insert_socket(sk);
703 }
704
705 nr->dest_addr = addr->sax25_call;
706
707 release_sock(sk);
708 circuit = nr_find_next_circuit();
709 lock_sock(sk);
710
711 nr->my_index = circuit / 256;
712 nr->my_id = circuit % 256;
713
714 circuit++;
715
716
717 sock->state = SS_CONNECTING;
718 sk->sk_state = TCP_SYN_SENT;
719
720 nr_establish_data_link(sk);
721
722 nr->state = NR_STATE_1;
723
724 nr_start_heartbeat(sk);
725
726
727 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
728 err = -EINPROGRESS;
729 goto out_release;
730 }
731
732
733
734
735
736 if (sk->sk_state == TCP_SYN_SENT) {
737 DEFINE_WAIT(wait);
738
739 for (;;) {
740 prepare_to_wait(sk->sk_sleep, &wait,
741 TASK_INTERRUPTIBLE);
742 if (sk->sk_state != TCP_SYN_SENT)
743 break;
744 if (!signal_pending(current)) {
745 release_sock(sk);
746 schedule();
747 lock_sock(sk);
748 continue;
749 }
750 err = -ERESTARTSYS;
751 break;
752 }
753 finish_wait(sk->sk_sleep, &wait);
754 if (err)
755 goto out_release;
756 }
757
758 if (sk->sk_state != TCP_ESTABLISHED) {
759 sock->state = SS_UNCONNECTED;
760 err = sock_error(sk);
761 goto out_release;
762 }
763
764 sock->state = SS_CONNECTED;
765
766out_release:
767 release_sock(sk);
768
769 return err;
770}
771
772static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
773{
774 struct sk_buff *skb;
775 struct sock *newsk;
776 DEFINE_WAIT(wait);
777 struct sock *sk;
778 int err = 0;
779
780 if ((sk = sock->sk) == NULL)
781 return -EINVAL;
782
783 lock_sock(sk);
784 if (sk->sk_type != SOCK_SEQPACKET) {
785 err = -EOPNOTSUPP;
786 goto out_release;
787 }
788
789 if (sk->sk_state != TCP_LISTEN) {
790 err = -EINVAL;
791 goto out_release;
792 }
793
794
795
796
797
798 for (;;) {
799 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
800 skb = skb_dequeue(&sk->sk_receive_queue);
801 if (skb)
802 break;
803
804 if (flags & O_NONBLOCK) {
805 err = -EWOULDBLOCK;
806 break;
807 }
808 if (!signal_pending(current)) {
809 release_sock(sk);
810 schedule();
811 lock_sock(sk);
812 continue;
813 }
814 err = -ERESTARTSYS;
815 break;
816 }
817 finish_wait(sk->sk_sleep, &wait);
818 if (err)
819 goto out_release;
820
821 newsk = skb->sk;
822 sock_graft(newsk, newsock);
823
824
825 kfree_skb(skb);
826 sk_acceptq_removed(sk);
827
828out_release:
829 release_sock(sk);
830
831 return err;
832}
833
834static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
835 int *uaddr_len, int peer)
836{
837 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
838 struct sock *sk = sock->sk;
839 struct nr_sock *nr = nr_sk(sk);
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 0;
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 skb_reset_transport_header(skb);
924
925 if (frametype == NR_CONNACK && skb->len == 22)
926 nr_sk(sk)->bpqext = 1;
927 else
928 nr_sk(sk)->bpqext = 0;
929
930 ret = nr_process_rx_frame(sk, skb);
931 bh_unlock_sock(sk);
932 return ret;
933 }
934
935
936
937
938 if (frametype != NR_CONNREQ) {
939
940
941
942
943
944
945
946
947
948 if (sysctl_netrom_reset_circuit &&
949 (frametype != NR_RESET || flags != 0))
950 nr_transmit_reset(skb, 1);
951
952 return 0;
953 }
954
955 sk = nr_find_listener(dest);
956
957 user = (ax25_address *)(skb->data + 21);
958
959 if (sk == NULL || sk_acceptq_is_full(sk) ||
960 (make = nr_make_new(sk)) == NULL) {
961 nr_transmit_refusal(skb, 0);
962 if (sk)
963 bh_unlock_sock(sk);
964 return 0;
965 }
966
967 window = skb->data[20];
968
969 skb->sk = make;
970 make->sk_state = TCP_ESTABLISHED;
971
972
973 nr_make = nr_sk(make);
974 nr_make->source_addr = *dest;
975 nr_make->dest_addr = *src;
976 nr_make->user_addr = *user;
977
978 nr_make->your_index = circuit_index;
979 nr_make->your_id = circuit_id;
980
981 bh_unlock_sock(sk);
982 circuit = nr_find_next_circuit();
983 bh_lock_sock(sk);
984
985 nr_make->my_index = circuit / 256;
986 nr_make->my_id = circuit % 256;
987
988 circuit++;
989
990
991 if (window < nr_make->window)
992 nr_make->window = window;
993
994
995 if (skb->len == 37) {
996 timeout = skb->data[36] * 256 + skb->data[35];
997 if (timeout * HZ < nr_make->t1)
998 nr_make->t1 = timeout * HZ;
999 nr_make->bpqext = 1;
1000 } else {
1001 nr_make->bpqext = 0;
1002 }
1003
1004 nr_write_internal(make, NR_CONNACK);
1005
1006 nr_make->condition = 0x00;
1007 nr_make->vs = 0;
1008 nr_make->va = 0;
1009 nr_make->vr = 0;
1010 nr_make->vl = 0;
1011 nr_make->state = NR_STATE_3;
1012 sk_acceptq_added(sk);
1013 skb_queue_head(&sk->sk_receive_queue, skb);
1014
1015 if (!sock_flag(sk, SOCK_DEAD))
1016 sk->sk_data_ready(sk, skb->len);
1017
1018 bh_unlock_sock(sk);
1019
1020 nr_insert_socket(make);
1021
1022 nr_start_heartbeat(make);
1023 nr_start_idletimer(make);
1024
1025 return 1;
1026}
1027
1028static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1029 struct msghdr *msg, size_t len)
1030{
1031 struct sock *sk = sock->sk;
1032 struct nr_sock *nr = nr_sk(sk);
1033 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1034 int err;
1035 struct sockaddr_ax25 sax;
1036 struct sk_buff *skb;
1037 unsigned char *asmptr;
1038 int size;
1039
1040 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1041 return -EINVAL;
1042
1043 lock_sock(sk);
1044 if (sock_flag(sk, SOCK_ZAPPED)) {
1045 err = -EADDRNOTAVAIL;
1046 goto out;
1047 }
1048
1049 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1050 send_sig(SIGPIPE, current, 0);
1051 err = -EPIPE;
1052 goto out;
1053 }
1054
1055 if (nr->device == NULL) {
1056 err = -ENETUNREACH;
1057 goto out;
1058 }
1059
1060 if (usax) {
1061 if (msg->msg_namelen < sizeof(sax)) {
1062 err = -EINVAL;
1063 goto out;
1064 }
1065 sax = *usax;
1066 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1067 err = -EISCONN;
1068 goto out;
1069 }
1070 if (sax.sax25_family != AF_NETROM) {
1071 err = -EINVAL;
1072 goto out;
1073 }
1074 } else {
1075 if (sk->sk_state != TCP_ESTABLISHED) {
1076 err = -ENOTCONN;
1077 goto out;
1078 }
1079 sax.sax25_family = AF_NETROM;
1080 sax.sax25_call = nr->dest_addr;
1081 }
1082
1083 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1084
1085
1086
1087 if (len > 65536) {
1088 err = -EMSGSIZE;
1089 goto out;
1090 }
1091
1092 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1093 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1094
1095 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1096 goto out;
1097
1098 skb_reserve(skb, size - len);
1099 skb_reset_transport_header(skb);
1100
1101
1102
1103
1104
1105 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1106 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1107
1108
1109
1110 *asmptr++ = nr->your_index;
1111 *asmptr++ = nr->your_id;
1112 *asmptr++ = 0;
1113 *asmptr++ = 0;
1114 *asmptr++ = NR_INFO;
1115 SOCK_DEBUG(sk, "Built header.\n");
1116
1117
1118
1119
1120 skb_put(skb, len);
1121
1122 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1123
1124
1125 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1126 kfree_skb(skb);
1127 err = -EFAULT;
1128 goto out;
1129 }
1130
1131 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1132
1133 if (sk->sk_state != TCP_ESTABLISHED) {
1134 kfree_skb(skb);
1135 err = -ENOTCONN;
1136 goto out;
1137 }
1138
1139 nr_output(sk, skb);
1140
1141 err = len;
1142out:
1143 release_sock(sk);
1144 return err;
1145}
1146
1147static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1148 struct msghdr *msg, size_t size, int flags)
1149{
1150 struct sock *sk = sock->sk;
1151 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1152 size_t copied;
1153 struct sk_buff *skb;
1154 int er;
1155
1156
1157
1158
1159
1160
1161 lock_sock(sk);
1162 if (sk->sk_state != TCP_ESTABLISHED) {
1163 release_sock(sk);
1164 return -ENOTCONN;
1165 }
1166
1167
1168 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1169 release_sock(sk);
1170 return er;
1171 }
1172
1173 skb_reset_transport_header(skb);
1174 copied = skb->len;
1175
1176 if (copied > size) {
1177 copied = size;
1178 msg->msg_flags |= MSG_TRUNC;
1179 }
1180
1181 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1182
1183 if (sax != NULL) {
1184 sax->sax25_family = AF_NETROM;
1185 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1186 AX25_ADDR_LEN);
1187 }
1188
1189 msg->msg_namelen = sizeof(*sax);
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)) return -EPERM;
1256 return nr_rt_ioctl(cmd, argp);
1257
1258 default:
1259 return -ENOIOCTLCMD;
1260 }
1261
1262 return 0;
1263}
1264
1265#ifdef CONFIG_PROC_FS
1266
1267static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1268{
1269 struct sock *s;
1270 struct hlist_node *node;
1271 int i = 1;
1272
1273 spin_lock_bh(&nr_list_lock);
1274 if (*pos == 0)
1275 return SEQ_START_TOKEN;
1276
1277 sk_for_each(s, node, &nr_list) {
1278 if (i == *pos)
1279 return s;
1280 ++i;
1281 }
1282 return NULL;
1283}
1284
1285static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1286{
1287 ++*pos;
1288
1289 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1290 : sk_next((struct sock *)v);
1291}
1292
1293static void nr_info_stop(struct seq_file *seq, void *v)
1294{
1295 spin_unlock_bh(&nr_list_lock);
1296}
1297
1298static int nr_info_show(struct seq_file *seq, void *v)
1299{
1300 struct sock *s = v;
1301 struct net_device *dev;
1302 struct nr_sock *nr;
1303 const char *devname;
1304 char buf[11];
1305
1306 if (v == SEQ_START_TOKEN)
1307 seq_puts(seq,
1308"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");
1309
1310 else {
1311
1312 bh_lock_sock(s);
1313 nr = nr_sk(s);
1314
1315 if ((dev = nr->device) == NULL)
1316 devname = "???";
1317 else
1318 devname = dev->name;
1319
1320 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1321 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1322 seq_printf(seq,
1323"%-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",
1324 ax2asc(buf, &nr->source_addr),
1325 devname,
1326 nr->my_index,
1327 nr->my_id,
1328 nr->your_index,
1329 nr->your_id,
1330 nr->state,
1331 nr->vs,
1332 nr->vr,
1333 nr->va,
1334 ax25_display_timer(&nr->t1timer) / HZ,
1335 nr->t1 / HZ,
1336 ax25_display_timer(&nr->t2timer) / HZ,
1337 nr->t2 / HZ,
1338 ax25_display_timer(&nr->t4timer) / HZ,
1339 nr->t4 / HZ,
1340 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1341 nr->idle / (60 * HZ),
1342 nr->n2count,
1343 nr->n2,
1344 nr->window,
1345 sk_wmem_alloc_get(s),
1346 sk_rmem_alloc_get(s),
1347 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1348
1349 bh_unlock_sock(s);
1350 }
1351 return 0;
1352}
1353
1354static const struct seq_operations nr_info_seqops = {
1355 .start = nr_info_start,
1356 .next = nr_info_next,
1357 .stop = nr_info_stop,
1358 .show = nr_info_show,
1359};
1360
1361static int nr_info_open(struct inode *inode, struct file *file)
1362{
1363 return seq_open(file, &nr_info_seqops);
1364}
1365
1366static const struct file_operations nr_info_fops = {
1367 .owner = THIS_MODULE,
1368 .open = nr_info_open,
1369 .read = seq_read,
1370 .llseek = seq_lseek,
1371 .release = seq_release,
1372};
1373#endif
1374
1375static struct net_proto_family nr_family_ops = {
1376 .family = PF_NETROM,
1377 .create = nr_create,
1378 .owner = THIS_MODULE,
1379};
1380
1381static const struct proto_ops nr_proto_ops = {
1382 .family = PF_NETROM,
1383 .owner = THIS_MODULE,
1384 .release = nr_release,
1385 .bind = nr_bind,
1386 .connect = nr_connect,
1387 .socketpair = sock_no_socketpair,
1388 .accept = nr_accept,
1389 .getname = nr_getname,
1390 .poll = datagram_poll,
1391 .ioctl = nr_ioctl,
1392 .listen = nr_listen,
1393 .shutdown = sock_no_shutdown,
1394 .setsockopt = nr_setsockopt,
1395 .getsockopt = nr_getsockopt,
1396 .sendmsg = nr_sendmsg,
1397 .recvmsg = nr_recvmsg,
1398 .mmap = sock_no_mmap,
1399 .sendpage = sock_no_sendpage,
1400};
1401
1402static struct notifier_block nr_dev_notifier = {
1403 .notifier_call = nr_device_event,
1404};
1405
1406static struct net_device **dev_nr;
1407
1408static struct ax25_protocol nr_pid = {
1409 .pid = AX25_P_NETROM,
1410 .func = nr_route_frame
1411};
1412
1413static struct ax25_linkfail nr_linkfail_notifier = {
1414 .func = nr_link_failed,
1415};
1416
1417static int __init nr_proto_init(void)
1418{
1419 int i;
1420 int rc = proto_register(&nr_proto, 0);
1421
1422 if (rc != 0)
1423 goto out;
1424
1425 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1426 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1427 return -1;
1428 }
1429
1430 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1431 if (dev_nr == NULL) {
1432 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1433 return -1;
1434 }
1435
1436 for (i = 0; i < nr_ndevs; i++) {
1437 char name[IFNAMSIZ];
1438 struct net_device *dev;
1439
1440 sprintf(name, "nr%d", i);
1441 dev = alloc_netdev(0, name, nr_setup);
1442 if (!dev) {
1443 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1444 goto fail;
1445 }
1446
1447 dev->base_addr = i;
1448 if (register_netdev(dev)) {
1449 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1450 free_netdev(dev);
1451 goto fail;
1452 }
1453 nr_set_lockdep_key(dev);
1454 dev_nr[i] = dev;
1455 }
1456
1457 if (sock_register(&nr_family_ops)) {
1458 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1459 goto fail;
1460 }
1461
1462 register_netdevice_notifier(&nr_dev_notifier);
1463
1464 ax25_register_pid(&nr_pid);
1465 ax25_linkfail_register(&nr_linkfail_notifier);
1466
1467#ifdef CONFIG_SYSCTL
1468 nr_register_sysctl();
1469#endif
1470
1471 nr_loopback_init();
1472
1473 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1474 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1475 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1476out:
1477 return rc;
1478fail:
1479 while (--i >= 0) {
1480 unregister_netdev(dev_nr[i]);
1481 free_netdev(dev_nr[i]);
1482 }
1483 kfree(dev_nr);
1484 proto_unregister(&nr_proto);
1485 rc = -1;
1486 goto out;
1487}
1488
1489module_init(nr_proto_init);
1490
1491module_param(nr_ndevs, int, 0);
1492MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1493
1494MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1495MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1496MODULE_LICENSE("GPL");
1497MODULE_ALIAS_NETPROTO(PF_NETROM);
1498
1499static void __exit nr_exit(void)
1500{
1501 int i;
1502
1503 proc_net_remove(&init_net, "nr");
1504 proc_net_remove(&init_net, "nr_neigh");
1505 proc_net_remove(&init_net, "nr_nodes");
1506 nr_loopback_clear();
1507
1508 nr_rt_free();
1509
1510#ifdef CONFIG_SYSCTL
1511 nr_unregister_sysctl();
1512#endif
1513
1514 ax25_linkfail_release(&nr_linkfail_notifier);
1515 ax25_protocol_release(AX25_P_NETROM);
1516
1517 unregister_netdevice_notifier(&nr_dev_notifier);
1518
1519 sock_unregister(PF_NETROM);
1520
1521 for (i = 0; i < nr_ndevs; i++) {
1522 struct net_device *dev = dev_nr[i];
1523 if (dev) {
1524 unregister_netdev(dev);
1525 free_netdev(dev);
1526 }
1527 }
1528
1529 kfree(dev_nr);
1530 proto_unregister(&nr_proto);
1531}
1532module_exit(nr_exit);
1533
