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