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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 (atomic_read(&sk->sk_wmem_alloc) ||
290 atomic_read(&sk->sk_rmem_alloc)) {
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, 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{
431 struct sock *sk;
432 struct nr_sock *nr;
433
434 if (net != &init_net)
435 return -EAFNOSUPPORT;
436
437 if (sock->type != SOCK_SEQPACKET || protocol != 0)
438 return -ESOCKTNOSUPPORT;
439
440 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto);
441 if (sk == NULL)
442 return -ENOMEM;
443
444 nr = nr_sk(sk);
445
446 sock_init_data(sock, sk);
447
448 sock->ops = &nr_proto_ops;
449 sk->sk_protocol = protocol;
450
451 skb_queue_head_init(&nr->ack_queue);
452 skb_queue_head_init(&nr->reseq_queue);
453 skb_queue_head_init(&nr->frag_queue);
454
455 nr_init_timers(sk);
456
457 nr->t1 =
458 msecs_to_jiffies(sysctl_netrom_transport_timeout);
459 nr->t2 =
460 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
461 nr->n2 =
462 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
463 nr->t4 =
464 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
465 nr->idle =
466 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
467 nr->window = sysctl_netrom_transport_requested_window_size;
468
469 nr->bpqext = 1;
470 nr->state = NR_STATE_0;
471
472 return 0;
473}
474
475static struct sock *nr_make_new(struct sock *osk)
476{
477 struct sock *sk;
478 struct nr_sock *nr, *onr;
479
480 if (osk->sk_type != SOCK_SEQPACKET)
481 return NULL;
482
483 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot);
484 if (sk == NULL)
485 return NULL;
486
487 nr = nr_sk(sk);
488
489 sock_init_data(NULL, sk);
490
491 sk->sk_type = osk->sk_type;
492 sk->sk_priority = osk->sk_priority;
493 sk->sk_protocol = osk->sk_protocol;
494 sk->sk_rcvbuf = osk->sk_rcvbuf;
495 sk->sk_sndbuf = osk->sk_sndbuf;
496 sk->sk_state = TCP_ESTABLISHED;
497 sock_copy_flags(sk, osk);
498
499 skb_queue_head_init(&nr->ack_queue);
500 skb_queue_head_init(&nr->reseq_queue);
501 skb_queue_head_init(&nr->frag_queue);
502
503 nr_init_timers(sk);
504
505 onr = nr_sk(osk);
506
507 nr->t1 = onr->t1;
508 nr->t2 = onr->t2;
509 nr->n2 = onr->n2;
510 nr->t4 = onr->t4;
511 nr->idle = onr->idle;
512 nr->window = onr->window;
513
514 nr->device = onr->device;
515 nr->bpqext = onr->bpqext;
516
517 return sk;
518}
519
520static int nr_release(struct socket *sock)
521{
522 struct sock *sk = sock->sk;
523 struct nr_sock *nr;
524
525 if (sk == NULL) return 0;
526
527 sock_hold(sk);
528 sock_orphan(sk);
529 lock_sock(sk);
530 nr = nr_sk(sk);
531
532 switch (nr->state) {
533 case NR_STATE_0:
534 case NR_STATE_1:
535 case NR_STATE_2:
536 nr_disconnect(sk, 0);
537 nr_destroy_socket(sk);
538 break;
539
540 case NR_STATE_3:
541 nr_clear_queues(sk);
542 nr->n2count = 0;
543 nr_write_internal(sk, NR_DISCREQ);
544 nr_start_t1timer(sk);
545 nr_stop_t2timer(sk);
546 nr_stop_t4timer(sk);
547 nr_stop_idletimer(sk);
548 nr->state = NR_STATE_2;
549 sk->sk_state = TCP_CLOSE;
550 sk->sk_shutdown |= SEND_SHUTDOWN;
551 sk->sk_state_change(sk);
552 sock_set_flag(sk, SOCK_DESTROY);
553 break;
554
555 default:
556 break;
557 }
558
559 sock->sk = NULL;
560 release_sock(sk);
561 sock_put(sk);
562
563 return 0;
564}
565
566static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
567{
568 struct sock *sk = sock->sk;
569 struct nr_sock *nr = nr_sk(sk);
570 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
571 struct net_device *dev;
572 ax25_uid_assoc *user;
573 ax25_address *source;
574
575 lock_sock(sk);
576 if (!sock_flag(sk, SOCK_ZAPPED)) {
577 release_sock(sk);
578 return -EINVAL;
579 }
580 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
581 release_sock(sk);
582 return -EINVAL;
583 }
584 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
585 release_sock(sk);
586 return -EINVAL;
587 }
588 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
589 release_sock(sk);
590 return -EINVAL;
591 }
592 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
593 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
594 release_sock(sk);
595 return -EADDRNOTAVAIL;
596 }
597
598
599
600
601 if (addr->fsa_ax25.sax25_ndigis == 1) {
602 if (!capable(CAP_NET_BIND_SERVICE)) {
603 dev_put(dev);
604 release_sock(sk);
605 return -EACCES;
606 }
607 nr->user_addr = addr->fsa_digipeater[0];
608 nr->source_addr = addr->fsa_ax25.sax25_call;
609 } else {
610 source = &addr->fsa_ax25.sax25_call;
611
612 user = ax25_findbyuid(current->euid);
613 if (user) {
614 nr->user_addr = user->call;
615 ax25_uid_put(user);
616 } else {
617 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
618 release_sock(sk);
619 dev_put(dev);
620 return -EPERM;
621 }
622 nr->user_addr = *source;
623 }
624
625 nr->source_addr = *source;
626 }
627
628 nr->device = dev;
629 nr_insert_socket(sk);
630
631 sock_reset_flag(sk, SOCK_ZAPPED);
632 dev_put(dev);
633 release_sock(sk);
634 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
635 return 0;
636}
637
638static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
639 int addr_len, int flags)
640{
641 struct sock *sk = sock->sk;
642 struct nr_sock *nr = nr_sk(sk);
643 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
644 ax25_address *source = NULL;
645 ax25_uid_assoc *user;
646 struct net_device *dev;
647 int err = 0;
648
649 lock_sock(sk);
650 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
651 sock->state = SS_CONNECTED;
652 goto out_release;
653 }
654
655 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
656 sock->state = SS_UNCONNECTED;
657 err = -ECONNREFUSED;
658 goto out_release;
659 }
660
661 if (sk->sk_state == TCP_ESTABLISHED) {
662 err = -EISCONN;
663 goto out_release;
664 }
665
666 sk->sk_state = TCP_CLOSE;
667 sock->state = SS_UNCONNECTED;
668
669 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
670 err = -EINVAL;
671 goto out_release;
672 }
673 if (addr->sax25_family != AF_NETROM) {
674 err = -EINVAL;
675 goto out_release;
676 }
677 if (sock_flag(sk, SOCK_ZAPPED)) {
678 sock_reset_flag(sk, SOCK_ZAPPED);
679
680 if ((dev = nr_dev_first()) == NULL) {
681 err = -ENETUNREACH;
682 goto out_release;
683 }
684 source = (ax25_address *)dev->dev_addr;
685
686 user = ax25_findbyuid(current->euid);
687 if (user) {
688 nr->user_addr = user->call;
689 ax25_uid_put(user);
690 } else {
691 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
692 dev_put(dev);
693 err = -EPERM;
694 goto out_release;
695 }
696 nr->user_addr = *source;
697 }
698
699 nr->source_addr = *source;
700 nr->device = dev;
701
702 dev_put(dev);
703 nr_insert_socket(sk);
704 }
705
706 nr->dest_addr = addr->sax25_call;
707
708 release_sock(sk);
709 circuit = nr_find_next_circuit();
710 lock_sock(sk);
711
712 nr->my_index = circuit / 256;
713 nr->my_id = circuit % 256;
714
715 circuit++;
716
717
718 sock->state = SS_CONNECTING;
719 sk->sk_state = TCP_SYN_SENT;
720
721 nr_establish_data_link(sk);
722
723 nr->state = NR_STATE_1;
724
725 nr_start_heartbeat(sk);
726
727
728 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
729 err = -EINPROGRESS;
730 goto out_release;
731 }
732
733
734
735
736
737 if (sk->sk_state == TCP_SYN_SENT) {
738 DEFINE_WAIT(wait);
739
740 for (;;) {
741 prepare_to_wait(sk->sk_sleep, &wait,
742 TASK_INTERRUPTIBLE);
743 if (sk->sk_state != TCP_SYN_SENT)
744 break;
745 if (!signal_pending(current)) {
746 release_sock(sk);
747 schedule();
748 lock_sock(sk);
749 continue;
750 }
751 err = -ERESTARTSYS;
752 break;
753 }
754 finish_wait(sk->sk_sleep, &wait);
755 if (err)
756 goto out_release;
757 }
758
759 if (sk->sk_state != TCP_ESTABLISHED) {
760 sock->state = SS_UNCONNECTED;
761 err = sock_error(sk);
762 goto out_release;
763 }
764
765 sock->state = SS_CONNECTED;
766
767out_release:
768 release_sock(sk);
769
770 return err;
771}
772
773static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
774{
775 struct sk_buff *skb;
776 struct sock *newsk;
777 DEFINE_WAIT(wait);
778 struct sock *sk;
779 int err = 0;
780
781 if ((sk = sock->sk) == NULL)
782 return -EINVAL;
783
784 lock_sock(sk);
785 if (sk->sk_type != SOCK_SEQPACKET) {
786 err = -EOPNOTSUPP;
787 goto out_release;
788 }
789
790 if (sk->sk_state != TCP_LISTEN) {
791 err = -EINVAL;
792 goto out_release;
793 }
794
795
796
797
798
799 for (;;) {
800 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
801 skb = skb_dequeue(&sk->sk_receive_queue);
802 if (skb)
803 break;
804
805 if (flags & O_NONBLOCK) {
806 err = -EWOULDBLOCK;
807 break;
808 }
809 if (!signal_pending(current)) {
810 release_sock(sk);
811 schedule();
812 lock_sock(sk);
813 continue;
814 }
815 err = -ERESTARTSYS;
816 break;
817 }
818 finish_wait(sk->sk_sleep, &wait);
819 if (err)
820 goto out_release;
821
822 newsk = skb->sk;
823 sock_graft(newsk, newsock);
824
825
826 kfree_skb(skb);
827 sk_acceptq_removed(sk);
828
829out_release:
830 release_sock(sk);
831
832 return err;
833}
834
835static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
836 int *uaddr_len, int peer)
837{
838 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
839 struct sock *sk = sock->sk;
840 struct nr_sock *nr = nr_sk(sk);
841
842 lock_sock(sk);
843 if (peer != 0) {
844 if (sk->sk_state != TCP_ESTABLISHED) {
845 release_sock(sk);
846 return -ENOTCONN;
847 }
848 sax->fsa_ax25.sax25_family = AF_NETROM;
849 sax->fsa_ax25.sax25_ndigis = 1;
850 sax->fsa_ax25.sax25_call = nr->user_addr;
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 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1087 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1088
1089 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1090 goto out;
1091
1092 skb_reserve(skb, size - len);
1093 skb_reset_transport_header(skb);
1094
1095
1096
1097
1098
1099 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1100 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1101
1102
1103
1104 *asmptr++ = nr->your_index;
1105 *asmptr++ = nr->your_id;
1106 *asmptr++ = 0;
1107 *asmptr++ = 0;
1108 *asmptr++ = NR_INFO;
1109 SOCK_DEBUG(sk, "Built header.\n");
1110
1111
1112
1113
1114 skb_put(skb, len);
1115
1116 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1117
1118
1119 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1120 kfree_skb(skb);
1121 err = -EFAULT;
1122 goto out;
1123 }
1124
1125 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1126
1127 if (sk->sk_state != TCP_ESTABLISHED) {
1128 kfree_skb(skb);
1129 err = -ENOTCONN;
1130 goto out;
1131 }
1132
1133 nr_output(sk, skb);
1134
1135 err = len;
1136out:
1137 release_sock(sk);
1138 return err;
1139}
1140
1141static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1142 struct msghdr *msg, size_t size, int flags)
1143{
1144 struct sock *sk = sock->sk;
1145 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1146 size_t copied;
1147 struct sk_buff *skb;
1148 int er;
1149
1150
1151
1152
1153
1154
1155 lock_sock(sk);
1156 if (sk->sk_state != TCP_ESTABLISHED) {
1157 release_sock(sk);
1158 return -ENOTCONN;
1159 }
1160
1161
1162 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1163 release_sock(sk);
1164 return er;
1165 }
1166
1167 skb_reset_transport_header(skb);
1168 copied = skb->len;
1169
1170 if (copied > size) {
1171 copied = size;
1172 msg->msg_flags |= MSG_TRUNC;
1173 }
1174
1175 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1176
1177 if (sax != NULL) {
1178 sax->sax25_family = AF_NETROM;
1179 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1180 AX25_ADDR_LEN);
1181 }
1182
1183 msg->msg_namelen = sizeof(*sax);
1184
1185 skb_free_datagram(sk, skb);
1186
1187 release_sock(sk);
1188 return copied;
1189}
1190
1191
1192static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1193{
1194 struct sock *sk = sock->sk;
1195 void __user *argp = (void __user *)arg;
1196 int ret;
1197
1198 switch (cmd) {
1199 case TIOCOUTQ: {
1200 long amount;
1201
1202 lock_sock(sk);
1203 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1204 if (amount < 0)
1205 amount = 0;
1206 release_sock(sk);
1207 return put_user(amount, (int __user *)argp);
1208 }
1209
1210 case TIOCINQ: {
1211 struct sk_buff *skb;
1212 long amount = 0L;
1213
1214 lock_sock(sk);
1215
1216 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1217 amount = skb->len;
1218 release_sock(sk);
1219 return put_user(amount, (int __user *)argp);
1220 }
1221
1222 case SIOCGSTAMP:
1223 lock_sock(sk);
1224 ret = sock_get_timestamp(sk, argp);
1225 release_sock(sk);
1226 return ret;
1227
1228 case SIOCGSTAMPNS:
1229 lock_sock(sk);
1230 ret = sock_get_timestampns(sk, argp);
1231 release_sock(sk);
1232 return ret;
1233
1234 case SIOCGIFADDR:
1235 case SIOCSIFADDR:
1236 case SIOCGIFDSTADDR:
1237 case SIOCSIFDSTADDR:
1238 case SIOCGIFBRDADDR:
1239 case SIOCSIFBRDADDR:
1240 case SIOCGIFNETMASK:
1241 case SIOCSIFNETMASK:
1242 case SIOCGIFMETRIC:
1243 case SIOCSIFMETRIC:
1244 return -EINVAL;
1245
1246 case SIOCADDRT:
1247 case SIOCDELRT:
1248 case SIOCNRDECOBS:
1249 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1250 return nr_rt_ioctl(cmd, argp);
1251
1252 default:
1253 return -ENOIOCTLCMD;
1254 }
1255
1256 return 0;
1257}
1258
1259#ifdef CONFIG_PROC_FS
1260
1261static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1262{
1263 struct sock *s;
1264 struct hlist_node *node;
1265 int i = 1;
1266
1267 spin_lock_bh(&nr_list_lock);
1268 if (*pos == 0)
1269 return SEQ_START_TOKEN;
1270
1271 sk_for_each(s, node, &nr_list) {
1272 if (i == *pos)
1273 return s;
1274 ++i;
1275 }
1276 return NULL;
1277}
1278
1279static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1280{
1281 ++*pos;
1282
1283 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1284 : sk_next((struct sock *)v);
1285}
1286
1287static void nr_info_stop(struct seq_file *seq, void *v)
1288{
1289 spin_unlock_bh(&nr_list_lock);
1290}
1291
1292static int nr_info_show(struct seq_file *seq, void *v)
1293{
1294 struct sock *s = v;
1295 struct net_device *dev;
1296 struct nr_sock *nr;
1297 const char *devname;
1298 char buf[11];
1299
1300 if (v == SEQ_START_TOKEN)
1301 seq_puts(seq,
1302"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");
1303
1304 else {
1305
1306 bh_lock_sock(s);
1307 nr = nr_sk(s);
1308
1309 if ((dev = nr->device) == NULL)
1310 devname = "???";
1311 else
1312 devname = dev->name;
1313
1314 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1315 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1316 seq_printf(seq,
1317"%-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",
1318 ax2asc(buf, &nr->source_addr),
1319 devname,
1320 nr->my_index,
1321 nr->my_id,
1322 nr->your_index,
1323 nr->your_id,
1324 nr->state,
1325 nr->vs,
1326 nr->vr,
1327 nr->va,
1328 ax25_display_timer(&nr->t1timer) / HZ,
1329 nr->t1 / HZ,
1330 ax25_display_timer(&nr->t2timer) / HZ,
1331 nr->t2 / HZ,
1332 ax25_display_timer(&nr->t4timer) / HZ,
1333 nr->t4 / HZ,
1334 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1335 nr->idle / (60 * HZ),
1336 nr->n2count,
1337 nr->n2,
1338 nr->window,
1339 atomic_read(&s->sk_wmem_alloc),
1340 atomic_read(&s->sk_rmem_alloc),
1341 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1342
1343 bh_unlock_sock(s);
1344 }
1345 return 0;
1346}
1347
1348static const struct seq_operations nr_info_seqops = {
1349 .start = nr_info_start,
1350 .next = nr_info_next,
1351 .stop = nr_info_stop,
1352 .show = nr_info_show,
1353};
1354
1355static int nr_info_open(struct inode *inode, struct file *file)
1356{
1357 return seq_open(file, &nr_info_seqops);
1358}
1359
1360static const struct file_operations nr_info_fops = {
1361 .owner = THIS_MODULE,
1362 .open = nr_info_open,
1363 .read = seq_read,
1364 .llseek = seq_lseek,
1365 .release = seq_release,
1366};
1367#endif
1368
1369static struct net_proto_family nr_family_ops = {
1370 .family = PF_NETROM,
1371 .create = nr_create,
1372 .owner = THIS_MODULE,
1373};
1374
1375static const struct proto_ops nr_proto_ops = {
1376 .family = PF_NETROM,
1377 .owner = THIS_MODULE,
1378 .release = nr_release,
1379 .bind = nr_bind,
1380 .connect = nr_connect,
1381 .socketpair = sock_no_socketpair,
1382 .accept = nr_accept,
1383 .getname = nr_getname,
1384 .poll = datagram_poll,
1385 .ioctl = nr_ioctl,
1386 .listen = nr_listen,
1387 .shutdown = sock_no_shutdown,
1388 .setsockopt = nr_setsockopt,
1389 .getsockopt = nr_getsockopt,
1390 .sendmsg = nr_sendmsg,
1391 .recvmsg = nr_recvmsg,
1392 .mmap = sock_no_mmap,
1393 .sendpage = sock_no_sendpage,
1394};
1395
1396static struct notifier_block nr_dev_notifier = {
1397 .notifier_call = nr_device_event,
1398};
1399
1400static struct net_device **dev_nr;
1401
1402static struct ax25_protocol nr_pid = {
1403 .pid = AX25_P_NETROM,
1404 .func = nr_route_frame
1405};
1406
1407static struct ax25_linkfail nr_linkfail_notifier = {
1408 .func = nr_link_failed,
1409};
1410
1411static int __init nr_proto_init(void)
1412{
1413 int i;
1414 int rc = proto_register(&nr_proto, 0);
1415
1416 if (rc != 0)
1417 goto out;
1418
1419 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1420 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1421 return -1;
1422 }
1423
1424 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1425 if (dev_nr == NULL) {
1426 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1427 return -1;
1428 }
1429
1430 for (i = 0; i < nr_ndevs; i++) {
1431 char name[IFNAMSIZ];
1432 struct net_device *dev;
1433
1434 sprintf(name, "nr%d", i);
1435 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1436 if (!dev) {
1437 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1438 goto fail;
1439 }
1440
1441 dev->base_addr = i;
1442 if (register_netdev(dev)) {
1443 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1444 free_netdev(dev);
1445 goto fail;
1446 }
1447 nr_set_lockdep_key(dev);
1448 dev_nr[i] = dev;
1449 }
1450
1451 if (sock_register(&nr_family_ops)) {
1452 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1453 goto fail;
1454 }
1455
1456 register_netdevice_notifier(&nr_dev_notifier);
1457
1458 ax25_register_pid(&nr_pid);
1459 ax25_linkfail_register(&nr_linkfail_notifier);
1460
1461#ifdef CONFIG_SYSCTL
1462 nr_register_sysctl();
1463#endif
1464
1465 nr_loopback_init();
1466
1467 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1468 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1469 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1470out:
1471 return rc;
1472fail:
1473 while (--i >= 0) {
1474 unregister_netdev(dev_nr[i]);
1475 free_netdev(dev_nr[i]);
1476 }
1477 kfree(dev_nr);
1478 proto_unregister(&nr_proto);
1479 rc = -1;
1480 goto out;
1481}
1482
1483module_init(nr_proto_init);
1484
1485module_param(nr_ndevs, int, 0);
1486MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1487
1488MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1489MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1490MODULE_LICENSE("GPL");
1491MODULE_ALIAS_NETPROTO(PF_NETROM);
1492
1493static void __exit nr_exit(void)
1494{
1495 int i;
1496
1497 proc_net_remove(&init_net, "nr");
1498 proc_net_remove(&init_net, "nr_neigh");
1499 proc_net_remove(&init_net, "nr_nodes");
1500 nr_loopback_clear();
1501
1502 nr_rt_free();
1503
1504#ifdef CONFIG_SYSCTL
1505 nr_unregister_sysctl();
1506#endif
1507
1508 ax25_linkfail_release(&nr_linkfail_notifier);
1509 ax25_protocol_release(AX25_P_NETROM);
1510
1511 unregister_netdevice_notifier(&nr_dev_notifier);
1512
1513 sock_unregister(PF_NETROM);
1514
1515 for (i = 0; i < nr_ndevs; i++) {
1516 struct net_device *dev = dev_nr[i];
1517 if (dev) {
1518 unregister_netdev(dev);
1519 free_netdev(dev);
1520 }
1521 }
1522
1523 kfree(dev_nr);
1524 proto_unregister(&nr_proto);
1525}
1526module_exit(nr_exit);