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[NET]: Make socket creation namespace safe.
[deliverable/linux.git] / net / netrom / af_netrom.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
10 */
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/capability.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/socket.h>
17 #include <linux/in.h>
18 #include <linux/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> /* For TIOCINQ/OUTQ */
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
47 static int nr_ndevs = 4;
48
49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET;
61
62 static unsigned short circuit = 0x101;
63
64 static HLIST_HEAD(nr_list);
65 static DEFINE_SPINLOCK(nr_list_lock);
66
67 static const struct proto_ops nr_proto_ops;
68
69 /*
70 * NETROM network devices are virtual network devices encapsulating NETROM
71 * frames into AX.25 which will be sent through an AX.25 device, so form a
72 * special "super class" of normal net devices; split their locks off into a
73 * separate class since they always nest.
74 */
75 static struct lock_class_key nr_netdev_xmit_lock_key;
76
77 /*
78 * Socket removal during an interrupt is now safe.
79 */
80 static void nr_remove_socket(struct sock *sk)
81 {
82 spin_lock_bh(&nr_list_lock);
83 sk_del_node_init(sk);
84 spin_unlock_bh(&nr_list_lock);
85 }
86
87 /*
88 * Kill all bound sockets on a dropped device.
89 */
90 static void nr_kill_by_device(struct net_device *dev)
91 {
92 struct sock *s;
93 struct hlist_node *node;
94
95 spin_lock_bh(&nr_list_lock);
96 sk_for_each(s, node, &nr_list)
97 if (nr_sk(s)->device == dev)
98 nr_disconnect(s, ENETUNREACH);
99 spin_unlock_bh(&nr_list_lock);
100 }
101
102 /*
103 * Handle device status changes.
104 */
105 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
106 {
107 struct net_device *dev = (struct net_device *)ptr;
108
109 if (event != NETDEV_DOWN)
110 return NOTIFY_DONE;
111
112 nr_kill_by_device(dev);
113 nr_rt_device_down(dev);
114
115 return NOTIFY_DONE;
116 }
117
118 /*
119 * Add a socket to the bound sockets list.
120 */
121 static void nr_insert_socket(struct sock *sk)
122 {
123 spin_lock_bh(&nr_list_lock);
124 sk_add_node(sk, &nr_list);
125 spin_unlock_bh(&nr_list_lock);
126 }
127
128 /*
129 * Find a socket that wants to accept the Connect Request we just
130 * received.
131 */
132 static struct sock *nr_find_listener(ax25_address *addr)
133 {
134 struct sock *s;
135 struct hlist_node *node;
136
137 spin_lock_bh(&nr_list_lock);
138 sk_for_each(s, node, &nr_list)
139 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
140 s->sk_state == TCP_LISTEN) {
141 bh_lock_sock(s);
142 goto found;
143 }
144 s = NULL;
145 found:
146 spin_unlock_bh(&nr_list_lock);
147 return s;
148 }
149
150 /*
151 * Find a connected NET/ROM socket given my circuit IDs.
152 */
153 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
154 {
155 struct sock *s;
156 struct hlist_node *node;
157
158 spin_lock_bh(&nr_list_lock);
159 sk_for_each(s, node, &nr_list) {
160 struct nr_sock *nr = nr_sk(s);
161
162 if (nr->my_index == index && nr->my_id == id) {
163 bh_lock_sock(s);
164 goto found;
165 }
166 }
167 s = NULL;
168 found:
169 spin_unlock_bh(&nr_list_lock);
170 return s;
171 }
172
173 /*
174 * Find a connected NET/ROM socket given their circuit IDs.
175 */
176 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
177 ax25_address *dest)
178 {
179 struct sock *s;
180 struct hlist_node *node;
181
182 spin_lock_bh(&nr_list_lock);
183 sk_for_each(s, node, &nr_list) {
184 struct nr_sock *nr = nr_sk(s);
185
186 if (nr->your_index == index && nr->your_id == id &&
187 !ax25cmp(&nr->dest_addr, dest)) {
188 bh_lock_sock(s);
189 goto found;
190 }
191 }
192 s = NULL;
193 found:
194 spin_unlock_bh(&nr_list_lock);
195 return s;
196 }
197
198 /*
199 * Find next free circuit ID.
200 */
201 static unsigned short nr_find_next_circuit(void)
202 {
203 unsigned short id = circuit;
204 unsigned char i, j;
205 struct sock *sk;
206
207 for (;;) {
208 i = id / 256;
209 j = id % 256;
210
211 if (i != 0 && j != 0) {
212 if ((sk=nr_find_socket(i, j)) == NULL)
213 break;
214 bh_unlock_sock(sk);
215 }
216
217 id++;
218 }
219
220 return id;
221 }
222
223 /*
224 * Deferred destroy.
225 */
226 void nr_destroy_socket(struct sock *);
227
228 /*
229 * Handler for deferred kills.
230 */
231 static void nr_destroy_timer(unsigned long data)
232 {
233 struct sock *sk=(struct sock *)data;
234 bh_lock_sock(sk);
235 sock_hold(sk);
236 nr_destroy_socket(sk);
237 bh_unlock_sock(sk);
238 sock_put(sk);
239 }
240
241 /*
242 * This is called from user mode and the timers. Thus it protects itself
243 * against interrupt users but doesn't worry about being called during
244 * work. Once it is removed from the queue no interrupt or bottom half
245 * will touch it and we are (fairly 8-) ) safe.
246 */
247 void nr_destroy_socket(struct sock *sk)
248 {
249 struct sk_buff *skb;
250
251 nr_remove_socket(sk);
252
253 nr_stop_heartbeat(sk);
254 nr_stop_t1timer(sk);
255 nr_stop_t2timer(sk);
256 nr_stop_t4timer(sk);
257 nr_stop_idletimer(sk);
258
259 nr_clear_queues(sk); /* Flush the queues */
260
261 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
262 if (skb->sk != sk) { /* A pending connection */
263 /* Queue the unaccepted socket for death */
264 sock_set_flag(skb->sk, SOCK_DEAD);
265 nr_start_heartbeat(skb->sk);
266 nr_sk(skb->sk)->state = NR_STATE_0;
267 }
268
269 kfree_skb(skb);
270 }
271
272 if (atomic_read(&sk->sk_wmem_alloc) ||
273 atomic_read(&sk->sk_rmem_alloc)) {
274 /* Defer: outstanding buffers */
275 sk->sk_timer.function = nr_destroy_timer;
276 sk->sk_timer.expires = jiffies + 2 * HZ;
277 add_timer(&sk->sk_timer);
278 } else
279 sock_put(sk);
280 }
281
282 /*
283 * Handling for system calls applied via the various interfaces to a
284 * NET/ROM socket object.
285 */
286
287 static int nr_setsockopt(struct socket *sock, int level, int optname,
288 char __user *optval, int optlen)
289 {
290 struct sock *sk = sock->sk;
291 struct nr_sock *nr = nr_sk(sk);
292 int opt;
293
294 if (level != SOL_NETROM)
295 return -ENOPROTOOPT;
296
297 if (optlen < sizeof(int))
298 return -EINVAL;
299
300 if (get_user(opt, (int __user *)optval))
301 return -EFAULT;
302
303 switch (optname) {
304 case NETROM_T1:
305 if (opt < 1)
306 return -EINVAL;
307 nr->t1 = opt * HZ;
308 return 0;
309
310 case NETROM_T2:
311 if (opt < 1)
312 return -EINVAL;
313 nr->t2 = opt * HZ;
314 return 0;
315
316 case NETROM_N2:
317 if (opt < 1 || opt > 31)
318 return -EINVAL;
319 nr->n2 = opt;
320 return 0;
321
322 case NETROM_T4:
323 if (opt < 1)
324 return -EINVAL;
325 nr->t4 = opt * HZ;
326 return 0;
327
328 case NETROM_IDLE:
329 if (opt < 0)
330 return -EINVAL;
331 nr->idle = opt * 60 * HZ;
332 return 0;
333
334 default:
335 return -ENOPROTOOPT;
336 }
337 }
338
339 static int nr_getsockopt(struct socket *sock, int level, int optname,
340 char __user *optval, int __user *optlen)
341 {
342 struct sock *sk = sock->sk;
343 struct nr_sock *nr = nr_sk(sk);
344 int val = 0;
345 int len;
346
347 if (level != SOL_NETROM)
348 return -ENOPROTOOPT;
349
350 if (get_user(len, optlen))
351 return -EFAULT;
352
353 if (len < 0)
354 return -EINVAL;
355
356 switch (optname) {
357 case NETROM_T1:
358 val = nr->t1 / HZ;
359 break;
360
361 case NETROM_T2:
362 val = nr->t2 / HZ;
363 break;
364
365 case NETROM_N2:
366 val = nr->n2;
367 break;
368
369 case NETROM_T4:
370 val = nr->t4 / HZ;
371 break;
372
373 case NETROM_IDLE:
374 val = nr->idle / (60 * HZ);
375 break;
376
377 default:
378 return -ENOPROTOOPT;
379 }
380
381 len = min_t(unsigned int, len, sizeof(int));
382
383 if (put_user(len, optlen))
384 return -EFAULT;
385
386 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
387 }
388
389 static int nr_listen(struct socket *sock, int backlog)
390 {
391 struct sock *sk = sock->sk;
392
393 lock_sock(sk);
394 if (sk->sk_state != TCP_LISTEN) {
395 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
396 sk->sk_max_ack_backlog = backlog;
397 sk->sk_state = TCP_LISTEN;
398 release_sock(sk);
399 return 0;
400 }
401 release_sock(sk);
402
403 return -EOPNOTSUPP;
404 }
405
406 static struct proto nr_proto = {
407 .name = "NETROM",
408 .owner = THIS_MODULE,
409 .obj_size = sizeof(struct nr_sock),
410 };
411
412 static int nr_create(struct net *net, struct socket *sock, int protocol)
413 {
414 struct sock *sk;
415 struct nr_sock *nr;
416
417 if (net != &init_net)
418 return -EAFNOSUPPORT;
419
420 if (sock->type != SOCK_SEQPACKET || protocol != 0)
421 return -ESOCKTNOSUPPORT;
422
423 if ((sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL)
424 return -ENOMEM;
425
426 nr = nr_sk(sk);
427
428 sock_init_data(sock, sk);
429
430 sock->ops = &nr_proto_ops;
431 sk->sk_protocol = protocol;
432
433 skb_queue_head_init(&nr->ack_queue);
434 skb_queue_head_init(&nr->reseq_queue);
435 skb_queue_head_init(&nr->frag_queue);
436
437 nr_init_timers(sk);
438
439 nr->t1 =
440 msecs_to_jiffies(sysctl_netrom_transport_timeout);
441 nr->t2 =
442 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
443 nr->n2 =
444 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
445 nr->t4 =
446 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
447 nr->idle =
448 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
449 nr->window = sysctl_netrom_transport_requested_window_size;
450
451 nr->bpqext = 1;
452 nr->state = NR_STATE_0;
453
454 return 0;
455 }
456
457 static struct sock *nr_make_new(struct sock *osk)
458 {
459 struct sock *sk;
460 struct nr_sock *nr, *onr;
461
462 if (osk->sk_type != SOCK_SEQPACKET)
463 return NULL;
464
465 if ((sk = sk_alloc(osk->sk_net, PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL)
466 return NULL;
467
468 nr = nr_sk(sk);
469
470 sock_init_data(NULL, sk);
471
472 sk->sk_type = osk->sk_type;
473 sk->sk_socket = osk->sk_socket;
474 sk->sk_priority = osk->sk_priority;
475 sk->sk_protocol = osk->sk_protocol;
476 sk->sk_rcvbuf = osk->sk_rcvbuf;
477 sk->sk_sndbuf = osk->sk_sndbuf;
478 sk->sk_state = TCP_ESTABLISHED;
479 sk->sk_sleep = osk->sk_sleep;
480 sock_copy_flags(sk, osk);
481
482 skb_queue_head_init(&nr->ack_queue);
483 skb_queue_head_init(&nr->reseq_queue);
484 skb_queue_head_init(&nr->frag_queue);
485
486 nr_init_timers(sk);
487
488 onr = nr_sk(osk);
489
490 nr->t1 = onr->t1;
491 nr->t2 = onr->t2;
492 nr->n2 = onr->n2;
493 nr->t4 = onr->t4;
494 nr->idle = onr->idle;
495 nr->window = onr->window;
496
497 nr->device = onr->device;
498 nr->bpqext = onr->bpqext;
499
500 return sk;
501 }
502
503 static int nr_release(struct socket *sock)
504 {
505 struct sock *sk = sock->sk;
506 struct nr_sock *nr;
507
508 if (sk == NULL) return 0;
509
510 sock_hold(sk);
511 lock_sock(sk);
512 nr = nr_sk(sk);
513
514 switch (nr->state) {
515 case NR_STATE_0:
516 case NR_STATE_1:
517 case NR_STATE_2:
518 nr_disconnect(sk, 0);
519 nr_destroy_socket(sk);
520 break;
521
522 case NR_STATE_3:
523 nr_clear_queues(sk);
524 nr->n2count = 0;
525 nr_write_internal(sk, NR_DISCREQ);
526 nr_start_t1timer(sk);
527 nr_stop_t2timer(sk);
528 nr_stop_t4timer(sk);
529 nr_stop_idletimer(sk);
530 nr->state = NR_STATE_2;
531 sk->sk_state = TCP_CLOSE;
532 sk->sk_shutdown |= SEND_SHUTDOWN;
533 sk->sk_state_change(sk);
534 sock_orphan(sk);
535 sock_set_flag(sk, SOCK_DESTROY);
536 sk->sk_socket = NULL;
537 break;
538
539 default:
540 sk->sk_socket = NULL;
541 break;
542 }
543
544 sock->sk = NULL;
545 release_sock(sk);
546 sock_put(sk);
547
548 return 0;
549 }
550
551 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
552 {
553 struct sock *sk = sock->sk;
554 struct nr_sock *nr = nr_sk(sk);
555 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
556 struct net_device *dev;
557 ax25_uid_assoc *user;
558 ax25_address *source;
559
560 lock_sock(sk);
561 if (!sock_flag(sk, SOCK_ZAPPED)) {
562 release_sock(sk);
563 return -EINVAL;
564 }
565 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
566 release_sock(sk);
567 return -EINVAL;
568 }
569 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
570 release_sock(sk);
571 return -EINVAL;
572 }
573 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
574 release_sock(sk);
575 return -EINVAL;
576 }
577 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
578 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
579 release_sock(sk);
580 return -EADDRNOTAVAIL;
581 }
582
583 /*
584 * Only the super user can set an arbitrary user callsign.
585 */
586 if (addr->fsa_ax25.sax25_ndigis == 1) {
587 if (!capable(CAP_NET_BIND_SERVICE)) {
588 dev_put(dev);
589 release_sock(sk);
590 return -EACCES;
591 }
592 nr->user_addr = addr->fsa_digipeater[0];
593 nr->source_addr = addr->fsa_ax25.sax25_call;
594 } else {
595 source = &addr->fsa_ax25.sax25_call;
596
597 user = ax25_findbyuid(current->euid);
598 if (user) {
599 nr->user_addr = user->call;
600 ax25_uid_put(user);
601 } else {
602 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
603 release_sock(sk);
604 dev_put(dev);
605 return -EPERM;
606 }
607 nr->user_addr = *source;
608 }
609
610 nr->source_addr = *source;
611 }
612
613 nr->device = dev;
614 nr_insert_socket(sk);
615
616 sock_reset_flag(sk, SOCK_ZAPPED);
617 dev_put(dev);
618 release_sock(sk);
619 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
620 return 0;
621 }
622
623 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
624 int addr_len, int flags)
625 {
626 struct sock *sk = sock->sk;
627 struct nr_sock *nr = nr_sk(sk);
628 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
629 ax25_address *source = NULL;
630 ax25_uid_assoc *user;
631 struct net_device *dev;
632 int err = 0;
633
634 lock_sock(sk);
635 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
636 sock->state = SS_CONNECTED;
637 goto out_release; /* Connect completed during a ERESTARTSYS event */
638 }
639
640 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
641 sock->state = SS_UNCONNECTED;
642 err = -ECONNREFUSED;
643 goto out_release;
644 }
645
646 if (sk->sk_state == TCP_ESTABLISHED) {
647 err = -EISCONN; /* No reconnect on a seqpacket socket */
648 goto out_release;
649 }
650
651 sk->sk_state = TCP_CLOSE;
652 sock->state = SS_UNCONNECTED;
653
654 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
655 err = -EINVAL;
656 goto out_release;
657 }
658 if (addr->sax25_family != AF_NETROM) {
659 err = -EINVAL;
660 goto out_release;
661 }
662 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
663 sock_reset_flag(sk, SOCK_ZAPPED);
664
665 if ((dev = nr_dev_first()) == NULL) {
666 err = -ENETUNREACH;
667 goto out_release;
668 }
669 source = (ax25_address *)dev->dev_addr;
670
671 user = ax25_findbyuid(current->euid);
672 if (user) {
673 nr->user_addr = user->call;
674 ax25_uid_put(user);
675 } else {
676 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
677 dev_put(dev);
678 err = -EPERM;
679 goto out_release;
680 }
681 nr->user_addr = *source;
682 }
683
684 nr->source_addr = *source;
685 nr->device = dev;
686
687 dev_put(dev);
688 nr_insert_socket(sk); /* Finish the bind */
689 }
690
691 nr->dest_addr = addr->sax25_call;
692
693 release_sock(sk);
694 circuit = nr_find_next_circuit();
695 lock_sock(sk);
696
697 nr->my_index = circuit / 256;
698 nr->my_id = circuit % 256;
699
700 circuit++;
701
702 /* Move to connecting socket, start sending Connect Requests */
703 sock->state = SS_CONNECTING;
704 sk->sk_state = TCP_SYN_SENT;
705
706 nr_establish_data_link(sk);
707
708 nr->state = NR_STATE_1;
709
710 nr_start_heartbeat(sk);
711
712 /* Now the loop */
713 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
714 err = -EINPROGRESS;
715 goto out_release;
716 }
717
718 /*
719 * A Connect Ack with Choke or timeout or failed routing will go to
720 * closed.
721 */
722 if (sk->sk_state == TCP_SYN_SENT) {
723 DEFINE_WAIT(wait);
724
725 for (;;) {
726 prepare_to_wait(sk->sk_sleep, &wait,
727 TASK_INTERRUPTIBLE);
728 if (sk->sk_state != TCP_SYN_SENT)
729 break;
730 if (!signal_pending(current)) {
731 release_sock(sk);
732 schedule();
733 lock_sock(sk);
734 continue;
735 }
736 err = -ERESTARTSYS;
737 break;
738 }
739 finish_wait(sk->sk_sleep, &wait);
740 if (err)
741 goto out_release;
742 }
743
744 if (sk->sk_state != TCP_ESTABLISHED) {
745 sock->state = SS_UNCONNECTED;
746 err = sock_error(sk); /* Always set at this point */
747 goto out_release;
748 }
749
750 sock->state = SS_CONNECTED;
751
752 out_release:
753 release_sock(sk);
754
755 return err;
756 }
757
758 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
759 {
760 struct sk_buff *skb;
761 struct sock *newsk;
762 DEFINE_WAIT(wait);
763 struct sock *sk;
764 int err = 0;
765
766 if ((sk = sock->sk) == NULL)
767 return -EINVAL;
768
769 lock_sock(sk);
770 if (sk->sk_type != SOCK_SEQPACKET) {
771 err = -EOPNOTSUPP;
772 goto out_release;
773 }
774
775 if (sk->sk_state != TCP_LISTEN) {
776 err = -EINVAL;
777 goto out_release;
778 }
779
780 /*
781 * The write queue this time is holding sockets ready to use
782 * hooked into the SABM we saved
783 */
784 for (;;) {
785 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
786 skb = skb_dequeue(&sk->sk_receive_queue);
787 if (skb)
788 break;
789
790 if (flags & O_NONBLOCK) {
791 err = -EWOULDBLOCK;
792 break;
793 }
794 if (!signal_pending(current)) {
795 release_sock(sk);
796 schedule();
797 lock_sock(sk);
798 continue;
799 }
800 err = -ERESTARTSYS;
801 break;
802 }
803 finish_wait(sk->sk_sleep, &wait);
804 if (err)
805 goto out_release;
806
807 newsk = skb->sk;
808 newsk->sk_socket = newsock;
809 newsk->sk_sleep = &newsock->wait;
810
811 /* Now attach up the new socket */
812 kfree_skb(skb);
813 sk_acceptq_removed(sk);
814 newsock->sk = newsk;
815
816 out_release:
817 release_sock(sk);
818
819 return err;
820 }
821
822 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
823 int *uaddr_len, int peer)
824 {
825 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
826 struct sock *sk = sock->sk;
827 struct nr_sock *nr = nr_sk(sk);
828
829 lock_sock(sk);
830 if (peer != 0) {
831 if (sk->sk_state != TCP_ESTABLISHED) {
832 release_sock(sk);
833 return -ENOTCONN;
834 }
835 sax->fsa_ax25.sax25_family = AF_NETROM;
836 sax->fsa_ax25.sax25_ndigis = 1;
837 sax->fsa_ax25.sax25_call = nr->user_addr;
838 sax->fsa_digipeater[0] = nr->dest_addr;
839 *uaddr_len = sizeof(struct full_sockaddr_ax25);
840 } else {
841 sax->fsa_ax25.sax25_family = AF_NETROM;
842 sax->fsa_ax25.sax25_ndigis = 0;
843 sax->fsa_ax25.sax25_call = nr->source_addr;
844 *uaddr_len = sizeof(struct sockaddr_ax25);
845 }
846 release_sock(sk);
847
848 return 0;
849 }
850
851 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
852 {
853 struct sock *sk;
854 struct sock *make;
855 struct nr_sock *nr_make;
856 ax25_address *src, *dest, *user;
857 unsigned short circuit_index, circuit_id;
858 unsigned short peer_circuit_index, peer_circuit_id;
859 unsigned short frametype, flags, window, timeout;
860 int ret;
861
862 skb->sk = NULL; /* Initially we don't know who it's for */
863
864 /*
865 * skb->data points to the netrom frame start
866 */
867
868 src = (ax25_address *)(skb->data + 0);
869 dest = (ax25_address *)(skb->data + 7);
870
871 circuit_index = skb->data[15];
872 circuit_id = skb->data[16];
873 peer_circuit_index = skb->data[17];
874 peer_circuit_id = skb->data[18];
875 frametype = skb->data[19] & 0x0F;
876 flags = skb->data[19] & 0xF0;
877
878 /*
879 * Check for an incoming IP over NET/ROM frame.
880 */
881 if (frametype == NR_PROTOEXT &&
882 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
883 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
884 skb_reset_transport_header(skb);
885
886 return nr_rx_ip(skb, dev);
887 }
888
889 /*
890 * Find an existing socket connection, based on circuit ID, if it's
891 * a Connect Request base it on their circuit ID.
892 *
893 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
894 * circuit that no longer exists at the other end ...
895 */
896
897 sk = NULL;
898
899 if (circuit_index == 0 && circuit_id == 0) {
900 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
901 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
902 } else {
903 if (frametype == NR_CONNREQ)
904 sk = nr_find_peer(circuit_index, circuit_id, src);
905 else
906 sk = nr_find_socket(circuit_index, circuit_id);
907 }
908
909 if (sk != NULL) {
910 skb_reset_transport_header(skb);
911
912 if (frametype == NR_CONNACK && skb->len == 22)
913 nr_sk(sk)->bpqext = 1;
914 else
915 nr_sk(sk)->bpqext = 0;
916
917 ret = nr_process_rx_frame(sk, skb);
918 bh_unlock_sock(sk);
919 return ret;
920 }
921
922 /*
923 * Now it should be a CONNREQ.
924 */
925 if (frametype != NR_CONNREQ) {
926 /*
927 * Here it would be nice to be able to send a reset but
928 * NET/ROM doesn't have one. We've tried to extend the protocol
929 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
930 * apparently kills BPQ boxes... :-(
931 * So now we try to follow the established behaviour of
932 * G8PZT's Xrouter which is sending packets with command type 7
933 * as an extension of the protocol.
934 */
935 if (sysctl_netrom_reset_circuit &&
936 (frametype != NR_RESET || flags != 0))
937 nr_transmit_reset(skb, 1);
938
939 return 0;
940 }
941
942 sk = nr_find_listener(dest);
943
944 user = (ax25_address *)(skb->data + 21);
945
946 if (sk == NULL || sk_acceptq_is_full(sk) ||
947 (make = nr_make_new(sk)) == NULL) {
948 nr_transmit_refusal(skb, 0);
949 if (sk)
950 bh_unlock_sock(sk);
951 return 0;
952 }
953
954 window = skb->data[20];
955
956 skb->sk = make;
957 make->sk_state = TCP_ESTABLISHED;
958
959 /* Fill in his circuit details */
960 nr_make = nr_sk(make);
961 nr_make->source_addr = *dest;
962 nr_make->dest_addr = *src;
963 nr_make->user_addr = *user;
964
965 nr_make->your_index = circuit_index;
966 nr_make->your_id = circuit_id;
967
968 bh_unlock_sock(sk);
969 circuit = nr_find_next_circuit();
970 bh_lock_sock(sk);
971
972 nr_make->my_index = circuit / 256;
973 nr_make->my_id = circuit % 256;
974
975 circuit++;
976
977 /* Window negotiation */
978 if (window < nr_make->window)
979 nr_make->window = window;
980
981 /* L4 timeout negotiation */
982 if (skb->len == 37) {
983 timeout = skb->data[36] * 256 + skb->data[35];
984 if (timeout * HZ < nr_make->t1)
985 nr_make->t1 = timeout * HZ;
986 nr_make->bpqext = 1;
987 } else {
988 nr_make->bpqext = 0;
989 }
990
991 nr_write_internal(make, NR_CONNACK);
992
993 nr_make->condition = 0x00;
994 nr_make->vs = 0;
995 nr_make->va = 0;
996 nr_make->vr = 0;
997 nr_make->vl = 0;
998 nr_make->state = NR_STATE_3;
999 sk_acceptq_added(sk);
1000 skb_queue_head(&sk->sk_receive_queue, skb);
1001
1002 if (!sock_flag(sk, SOCK_DEAD))
1003 sk->sk_data_ready(sk, skb->len);
1004
1005 bh_unlock_sock(sk);
1006
1007 nr_insert_socket(make);
1008
1009 nr_start_heartbeat(make);
1010 nr_start_idletimer(make);
1011
1012 return 1;
1013 }
1014
1015 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1016 struct msghdr *msg, size_t len)
1017 {
1018 struct sock *sk = sock->sk;
1019 struct nr_sock *nr = nr_sk(sk);
1020 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1021 int err;
1022 struct sockaddr_ax25 sax;
1023 struct sk_buff *skb;
1024 unsigned char *asmptr;
1025 int size;
1026
1027 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1028 return -EINVAL;
1029
1030 lock_sock(sk);
1031 if (sock_flag(sk, SOCK_ZAPPED)) {
1032 err = -EADDRNOTAVAIL;
1033 goto out;
1034 }
1035
1036 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1037 send_sig(SIGPIPE, current, 0);
1038 err = -EPIPE;
1039 goto out;
1040 }
1041
1042 if (nr->device == NULL) {
1043 err = -ENETUNREACH;
1044 goto out;
1045 }
1046
1047 if (usax) {
1048 if (msg->msg_namelen < sizeof(sax)) {
1049 err = -EINVAL;
1050 goto out;
1051 }
1052 sax = *usax;
1053 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1054 err = -EISCONN;
1055 goto out;
1056 }
1057 if (sax.sax25_family != AF_NETROM) {
1058 err = -EINVAL;
1059 goto out;
1060 }
1061 } else {
1062 if (sk->sk_state != TCP_ESTABLISHED) {
1063 err = -ENOTCONN;
1064 goto out;
1065 }
1066 sax.sax25_family = AF_NETROM;
1067 sax.sax25_call = nr->dest_addr;
1068 }
1069
1070 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1071
1072 /* Build a packet */
1073 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1074 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1075
1076 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1077 goto out;
1078
1079 skb_reserve(skb, size - len);
1080 skb_reset_transport_header(skb);
1081
1082 /*
1083 * Push down the NET/ROM header
1084 */
1085
1086 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1087 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1088
1089 /* Build a NET/ROM Transport header */
1090
1091 *asmptr++ = nr->your_index;
1092 *asmptr++ = nr->your_id;
1093 *asmptr++ = 0; /* To be filled in later */
1094 *asmptr++ = 0; /* Ditto */
1095 *asmptr++ = NR_INFO;
1096 SOCK_DEBUG(sk, "Built header.\n");
1097
1098 /*
1099 * Put the data on the end
1100 */
1101 skb_put(skb, len);
1102
1103 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1104
1105 /* User data follows immediately after the NET/ROM transport header */
1106 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
1107 kfree_skb(skb);
1108 err = -EFAULT;
1109 goto out;
1110 }
1111
1112 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1113
1114 if (sk->sk_state != TCP_ESTABLISHED) {
1115 kfree_skb(skb);
1116 err = -ENOTCONN;
1117 goto out;
1118 }
1119
1120 nr_output(sk, skb); /* Shove it onto the queue */
1121
1122 err = len;
1123 out:
1124 release_sock(sk);
1125 return err;
1126 }
1127
1128 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1129 struct msghdr *msg, size_t size, int flags)
1130 {
1131 struct sock *sk = sock->sk;
1132 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1133 size_t copied;
1134 struct sk_buff *skb;
1135 int er;
1136
1137 /*
1138 * This works for seqpacket too. The receiver has ordered the queue for
1139 * us! We do one quick check first though
1140 */
1141
1142 lock_sock(sk);
1143 if (sk->sk_state != TCP_ESTABLISHED) {
1144 release_sock(sk);
1145 return -ENOTCONN;
1146 }
1147
1148 /* Now we can treat all alike */
1149 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1150 release_sock(sk);
1151 return er;
1152 }
1153
1154 skb_reset_transport_header(skb);
1155 copied = skb->len;
1156
1157 if (copied > size) {
1158 copied = size;
1159 msg->msg_flags |= MSG_TRUNC;
1160 }
1161
1162 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1163
1164 if (sax != NULL) {
1165 sax->sax25_family = AF_NETROM;
1166 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1167 AX25_ADDR_LEN);
1168 }
1169
1170 msg->msg_namelen = sizeof(*sax);
1171
1172 skb_free_datagram(sk, skb);
1173
1174 release_sock(sk);
1175 return copied;
1176 }
1177
1178
1179 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1180 {
1181 struct sock *sk = sock->sk;
1182 void __user *argp = (void __user *)arg;
1183 int ret;
1184
1185 switch (cmd) {
1186 case TIOCOUTQ: {
1187 long amount;
1188
1189 lock_sock(sk);
1190 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1191 if (amount < 0)
1192 amount = 0;
1193 release_sock(sk);
1194 return put_user(amount, (int __user *)argp);
1195 }
1196
1197 case TIOCINQ: {
1198 struct sk_buff *skb;
1199 long amount = 0L;
1200
1201 lock_sock(sk);
1202 /* These two are safe on a single CPU system as only user tasks fiddle here */
1203 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1204 amount = skb->len;
1205 release_sock(sk);
1206 return put_user(amount, (int __user *)argp);
1207 }
1208
1209 case SIOCGSTAMP:
1210 lock_sock(sk);
1211 ret = sock_get_timestamp(sk, argp);
1212 release_sock(sk);
1213 return ret;
1214
1215 case SIOCGSTAMPNS:
1216 lock_sock(sk);
1217 ret = sock_get_timestampns(sk, argp);
1218 release_sock(sk);
1219 return ret;
1220
1221 case SIOCGIFADDR:
1222 case SIOCSIFADDR:
1223 case SIOCGIFDSTADDR:
1224 case SIOCSIFDSTADDR:
1225 case SIOCGIFBRDADDR:
1226 case SIOCSIFBRDADDR:
1227 case SIOCGIFNETMASK:
1228 case SIOCSIFNETMASK:
1229 case SIOCGIFMETRIC:
1230 case SIOCSIFMETRIC:
1231 return -EINVAL;
1232
1233 case SIOCADDRT:
1234 case SIOCDELRT:
1235 case SIOCNRDECOBS:
1236 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1237 return nr_rt_ioctl(cmd, argp);
1238
1239 default:
1240 return -ENOIOCTLCMD;
1241 }
1242
1243 return 0;
1244 }
1245
1246 #ifdef CONFIG_PROC_FS
1247
1248 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1249 {
1250 struct sock *s;
1251 struct hlist_node *node;
1252 int i = 1;
1253
1254 spin_lock_bh(&nr_list_lock);
1255 if (*pos == 0)
1256 return SEQ_START_TOKEN;
1257
1258 sk_for_each(s, node, &nr_list) {
1259 if (i == *pos)
1260 return s;
1261 ++i;
1262 }
1263 return NULL;
1264 }
1265
1266 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1267 {
1268 ++*pos;
1269
1270 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1271 : sk_next((struct sock *)v);
1272 }
1273
1274 static void nr_info_stop(struct seq_file *seq, void *v)
1275 {
1276 spin_unlock_bh(&nr_list_lock);
1277 }
1278
1279 static int nr_info_show(struct seq_file *seq, void *v)
1280 {
1281 struct sock *s = v;
1282 struct net_device *dev;
1283 struct nr_sock *nr;
1284 const char *devname;
1285 char buf[11];
1286
1287 if (v == SEQ_START_TOKEN)
1288 seq_puts(seq,
1289 "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");
1290
1291 else {
1292
1293 bh_lock_sock(s);
1294 nr = nr_sk(s);
1295
1296 if ((dev = nr->device) == NULL)
1297 devname = "???";
1298 else
1299 devname = dev->name;
1300
1301 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1302 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1303 seq_printf(seq,
1304 "%-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",
1305 ax2asc(buf, &nr->source_addr),
1306 devname,
1307 nr->my_index,
1308 nr->my_id,
1309 nr->your_index,
1310 nr->your_id,
1311 nr->state,
1312 nr->vs,
1313 nr->vr,
1314 nr->va,
1315 ax25_display_timer(&nr->t1timer) / HZ,
1316 nr->t1 / HZ,
1317 ax25_display_timer(&nr->t2timer) / HZ,
1318 nr->t2 / HZ,
1319 ax25_display_timer(&nr->t4timer) / HZ,
1320 nr->t4 / HZ,
1321 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1322 nr->idle / (60 * HZ),
1323 nr->n2count,
1324 nr->n2,
1325 nr->window,
1326 atomic_read(&s->sk_wmem_alloc),
1327 atomic_read(&s->sk_rmem_alloc),
1328 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1329
1330 bh_unlock_sock(s);
1331 }
1332 return 0;
1333 }
1334
1335 static const struct seq_operations nr_info_seqops = {
1336 .start = nr_info_start,
1337 .next = nr_info_next,
1338 .stop = nr_info_stop,
1339 .show = nr_info_show,
1340 };
1341
1342 static int nr_info_open(struct inode *inode, struct file *file)
1343 {
1344 return seq_open(file, &nr_info_seqops);
1345 }
1346
1347 static const struct file_operations nr_info_fops = {
1348 .owner = THIS_MODULE,
1349 .open = nr_info_open,
1350 .read = seq_read,
1351 .llseek = seq_lseek,
1352 .release = seq_release,
1353 };
1354 #endif /* CONFIG_PROC_FS */
1355
1356 static struct net_proto_family nr_family_ops = {
1357 .family = PF_NETROM,
1358 .create = nr_create,
1359 .owner = THIS_MODULE,
1360 };
1361
1362 static const struct proto_ops nr_proto_ops = {
1363 .family = PF_NETROM,
1364 .owner = THIS_MODULE,
1365 .release = nr_release,
1366 .bind = nr_bind,
1367 .connect = nr_connect,
1368 .socketpair = sock_no_socketpair,
1369 .accept = nr_accept,
1370 .getname = nr_getname,
1371 .poll = datagram_poll,
1372 .ioctl = nr_ioctl,
1373 .listen = nr_listen,
1374 .shutdown = sock_no_shutdown,
1375 .setsockopt = nr_setsockopt,
1376 .getsockopt = nr_getsockopt,
1377 .sendmsg = nr_sendmsg,
1378 .recvmsg = nr_recvmsg,
1379 .mmap = sock_no_mmap,
1380 .sendpage = sock_no_sendpage,
1381 };
1382
1383 static struct notifier_block nr_dev_notifier = {
1384 .notifier_call = nr_device_event,
1385 };
1386
1387 static struct net_device **dev_nr;
1388
1389 static struct ax25_protocol nr_pid = {
1390 .pid = AX25_P_NETROM,
1391 .func = nr_route_frame
1392 };
1393
1394 static struct ax25_linkfail nr_linkfail_notifier = {
1395 .func = nr_link_failed,
1396 };
1397
1398 static int __init nr_proto_init(void)
1399 {
1400 int i;
1401 int rc = proto_register(&nr_proto, 0);
1402
1403 if (rc != 0)
1404 goto out;
1405
1406 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1407 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1408 return -1;
1409 }
1410
1411 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1412 if (dev_nr == NULL) {
1413 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1414 return -1;
1415 }
1416
1417 for (i = 0; i < nr_ndevs; i++) {
1418 char name[IFNAMSIZ];
1419 struct net_device *dev;
1420
1421 sprintf(name, "nr%d", i);
1422 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1423 if (!dev) {
1424 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1425 goto fail;
1426 }
1427
1428 dev->base_addr = i;
1429 if (register_netdev(dev)) {
1430 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1431 free_netdev(dev);
1432 goto fail;
1433 }
1434 lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key);
1435 dev_nr[i] = dev;
1436 }
1437
1438 if (sock_register(&nr_family_ops)) {
1439 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1440 goto fail;
1441 }
1442
1443 register_netdevice_notifier(&nr_dev_notifier);
1444
1445 ax25_register_pid(&nr_pid);
1446 ax25_linkfail_register(&nr_linkfail_notifier);
1447
1448 #ifdef CONFIG_SYSCTL
1449 nr_register_sysctl();
1450 #endif
1451
1452 nr_loopback_init();
1453
1454 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops);
1455 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops);
1456 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops);
1457 out:
1458 return rc;
1459 fail:
1460 while (--i >= 0) {
1461 unregister_netdev(dev_nr[i]);
1462 free_netdev(dev_nr[i]);
1463 }
1464 kfree(dev_nr);
1465 proto_unregister(&nr_proto);
1466 rc = -1;
1467 goto out;
1468 }
1469
1470 module_init(nr_proto_init);
1471
1472 module_param(nr_ndevs, int, 0);
1473 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1474
1475 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1476 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1477 MODULE_LICENSE("GPL");
1478 MODULE_ALIAS_NETPROTO(PF_NETROM);
1479
1480 static void __exit nr_exit(void)
1481 {
1482 int i;
1483
1484 proc_net_remove(&init_net, "nr");
1485 proc_net_remove(&init_net, "nr_neigh");
1486 proc_net_remove(&init_net, "nr_nodes");
1487 nr_loopback_clear();
1488
1489 nr_rt_free();
1490
1491 #ifdef CONFIG_SYSCTL
1492 nr_unregister_sysctl();
1493 #endif
1494
1495 ax25_linkfail_release(&nr_linkfail_notifier);
1496 ax25_protocol_release(AX25_P_NETROM);
1497
1498 unregister_netdevice_notifier(&nr_dev_notifier);
1499
1500 sock_unregister(PF_NETROM);
1501
1502 for (i = 0; i < nr_ndevs; i++) {
1503 struct net_device *dev = dev_nr[i];
1504 if (dev) {
1505 unregister_netdev(dev);
1506 free_netdev(dev);
1507 }
1508 }
1509
1510 kfree(dev_nr);
1511 proto_unregister(&nr_proto);
1512 }
1513 module_exit(nr_exit);
Linux kernel - Deliverables
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