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NFS: Split fs/nfs/inode.c
[wrt350n-kernel.git] / net / netrom / af_netrom.c
blob3669cb953e6e7d49c05eb82c39ba1d43e80f9e3d
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/config.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/socket.h>
18 #include <linux/in.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/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 * Socket removal during an interrupt is now safe.
71 */
72 static void nr_remove_socket(struct sock *sk)
73 {
74 spin_lock_bh(&nr_list_lock);
75 sk_del_node_init(sk);
76 spin_unlock_bh(&nr_list_lock);
77 }
78
79 /*
80 * Kill all bound sockets on a dropped device.
81 */
82 static void nr_kill_by_device(struct net_device *dev)
83 {
84 struct sock *s;
85 struct hlist_node *node;
86
87 spin_lock_bh(&nr_list_lock);
88 sk_for_each(s, node, &nr_list)
89 if (nr_sk(s)->device == dev)
90 nr_disconnect(s, ENETUNREACH);
91 spin_unlock_bh(&nr_list_lock);
92 }
93
94 /*
95 * Handle device status changes.
96 */
97 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
98 {
99 struct net_device *dev = (struct net_device *)ptr;
100
101 if (event != NETDEV_DOWN)
102 return NOTIFY_DONE;
103
104 nr_kill_by_device(dev);
105 nr_rt_device_down(dev);
106
107 return NOTIFY_DONE;
108 }
109
110 /*
111 * Add a socket to the bound sockets list.
112 */
113 static void nr_insert_socket(struct sock *sk)
114 {
115 spin_lock_bh(&nr_list_lock);
116 sk_add_node(sk, &nr_list);
117 spin_unlock_bh(&nr_list_lock);
118 }
119
120 /*
121 * Find a socket that wants to accept the Connect Request we just
122 * received.
123 */
124 static struct sock *nr_find_listener(ax25_address *addr)
125 {
126 struct sock *s;
127 struct hlist_node *node;
128
129 spin_lock_bh(&nr_list_lock);
130 sk_for_each(s, node, &nr_list)
131 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
132 s->sk_state == TCP_LISTEN) {
133 bh_lock_sock(s);
134 goto found;
135 }
136 s = NULL;
137 found:
138 spin_unlock_bh(&nr_list_lock);
139 return s;
140 }
141
142 /*
143 * Find a connected NET/ROM socket given my circuit IDs.
144 */
145 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
146 {
147 struct sock *s;
148 struct hlist_node *node;
149
150 spin_lock_bh(&nr_list_lock);
151 sk_for_each(s, node, &nr_list) {
152 struct nr_sock *nr = nr_sk(s);
153
154 if (nr->my_index == index && nr->my_id == id) {
155 bh_lock_sock(s);
156 goto found;
157 }
158 }
159 s = NULL;
160 found:
161 spin_unlock_bh(&nr_list_lock);
162 return s;
163 }
164
165 /*
166 * Find a connected NET/ROM socket given their circuit IDs.
167 */
168 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
169 ax25_address *dest)
170 {
171 struct sock *s;
172 struct hlist_node *node;
173
174 spin_lock_bh(&nr_list_lock);
175 sk_for_each(s, node, &nr_list) {
176 struct nr_sock *nr = nr_sk(s);
177
178 if (nr->your_index == index && nr->your_id == id &&
179 !ax25cmp(&nr->dest_addr, dest)) {
180 bh_lock_sock(s);
181 goto found;
182 }
183 }
184 s = NULL;
185 found:
186 spin_unlock_bh(&nr_list_lock);
187 return s;
188 }
189
190 /*
191 * Find next free circuit ID.
192 */
193 static unsigned short nr_find_next_circuit(void)
194 {
195 unsigned short id = circuit;
196 unsigned char i, j;
197 struct sock *sk;
198
199 for (;;) {
200 i = id / 256;
201 j = id % 256;
202
203 if (i != 0 && j != 0) {
204 if ((sk=nr_find_socket(i, j)) == NULL)
205 break;
206 bh_unlock_sock(sk);
207 }
208
209 id++;
210 }
211
212 return id;
213 }
214
215 /*
216 * Deferred destroy.
217 */
218 void nr_destroy_socket(struct sock *);
219
220 /*
221 * Handler for deferred kills.
222 */
223 static void nr_destroy_timer(unsigned long data)
224 {
225 struct sock *sk=(struct sock *)data;
226 bh_lock_sock(sk);
227 sock_hold(sk);
228 nr_destroy_socket(sk);
229 bh_unlock_sock(sk);
230 sock_put(sk);
231 }
232
233 /*
234 * This is called from user mode and the timers. Thus it protects itself
235 * against interrupt users but doesn't worry about being called during
236 * work. Once it is removed from the queue no interrupt or bottom half
237 * will touch it and we are (fairly 8-) ) safe.
238 */
239 void nr_destroy_socket(struct sock *sk)
240 {
241 struct sk_buff *skb;
242
243 nr_remove_socket(sk);
244
245 nr_stop_heartbeat(sk);
246 nr_stop_t1timer(sk);
247 nr_stop_t2timer(sk);
248 nr_stop_t4timer(sk);
249 nr_stop_idletimer(sk);
250
251 nr_clear_queues(sk); /* Flush the queues */
252
253 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
254 if (skb->sk != sk) { /* A pending connection */
255 /* Queue the unaccepted socket for death */
256 sock_set_flag(skb->sk, SOCK_DEAD);
257 nr_start_heartbeat(skb->sk);
258 nr_sk(skb->sk)->state = NR_STATE_0;
259 }
260
261 kfree_skb(skb);
262 }
263
264 if (atomic_read(&sk->sk_wmem_alloc) ||
265 atomic_read(&sk->sk_rmem_alloc)) {
266 /* Defer: outstanding buffers */
267 sk->sk_timer.function = nr_destroy_timer;
268 sk->sk_timer.expires = jiffies + 2 * HZ;
269 add_timer(&sk->sk_timer);
270 } else
271 sock_put(sk);
272 }
273
274 /*
275 * Handling for system calls applied via the various interfaces to a
276 * NET/ROM socket object.
277 */
278
279 static int nr_setsockopt(struct socket *sock, int level, int optname,
280 char __user *optval, int optlen)
281 {
282 struct sock *sk = sock->sk;
283 struct nr_sock *nr = nr_sk(sk);
284 int opt;
285
286 if (level != SOL_NETROM)
287 return -ENOPROTOOPT;
288
289 if (optlen < sizeof(int))
290 return -EINVAL;
291
292 if (get_user(opt, (int __user *)optval))
293 return -EFAULT;
294
295 switch (optname) {
296 case NETROM_T1:
297 if (opt < 1)
298 return -EINVAL;
299 nr->t1 = opt * HZ;
300 return 0;
301
302 case NETROM_T2:
303 if (opt < 1)
304 return -EINVAL;
305 nr->t2 = opt * HZ;
306 return 0;
307
308 case NETROM_N2:
309 if (opt < 1 || opt > 31)
310 return -EINVAL;
311 nr->n2 = opt;
312 return 0;
313
314 case NETROM_T4:
315 if (opt < 1)
316 return -EINVAL;
317 nr->t4 = opt * HZ;
318 return 0;
319
320 case NETROM_IDLE:
321 if (opt < 0)
322 return -EINVAL;
323 nr->idle = opt * 60 * HZ;
324 return 0;
325
326 default:
327 return -ENOPROTOOPT;
328 }
329 }
330
331 static int nr_getsockopt(struct socket *sock, int level, int optname,
332 char __user *optval, int __user *optlen)
333 {
334 struct sock *sk = sock->sk;
335 struct nr_sock *nr = nr_sk(sk);
336 int val = 0;
337 int len;
338
339 if (level != SOL_NETROM)
340 return -ENOPROTOOPT;
341
342 if (get_user(len, optlen))
343 return -EFAULT;
344
345 if (len < 0)
346 return -EINVAL;
347
348 switch (optname) {
349 case NETROM_T1:
350 val = nr->t1 / HZ;
351 break;
352
353 case NETROM_T2:
354 val = nr->t2 / HZ;
355 break;
356
357 case NETROM_N2:
358 val = nr->n2;
359 break;
360
361 case NETROM_T4:
362 val = nr->t4 / HZ;
363 break;
364
365 case NETROM_IDLE:
366 val = nr->idle / (60 * HZ);
367 break;
368
369 default:
370 return -ENOPROTOOPT;
371 }
372
373 len = min_t(unsigned int, len, sizeof(int));
374
375 if (put_user(len, optlen))
376 return -EFAULT;
377
378 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
379 }
380
381 static int nr_listen(struct socket *sock, int backlog)
382 {
383 struct sock *sk = sock->sk;
384
385 lock_sock(sk);
386 if (sk->sk_state != TCP_LISTEN) {
387 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
388 sk->sk_max_ack_backlog = backlog;
389 sk->sk_state = TCP_LISTEN;
390 release_sock(sk);
391 return 0;
392 }
393 release_sock(sk);
394
395 return -EOPNOTSUPP;
396 }
397
398 static struct proto nr_proto = {
399 .name = "NETROM",
400 .owner = THIS_MODULE,
401 .obj_size = sizeof(struct nr_sock),
402 };
403
404 static int nr_create(struct socket *sock, int protocol)
405 {
406 struct sock *sk;
407 struct nr_sock *nr;
408
409 if (sock->type != SOCK_SEQPACKET || protocol != 0)
410 return -ESOCKTNOSUPPORT;
411
412 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL)
413 return -ENOMEM;
414
415 nr = nr_sk(sk);
416
417 sock_init_data(sock, sk);
418
419 sock->ops = &nr_proto_ops;
420 sk->sk_protocol = protocol;
421
422 skb_queue_head_init(&nr->ack_queue);
423 skb_queue_head_init(&nr->reseq_queue);
424 skb_queue_head_init(&nr->frag_queue);
425
426 nr_init_timers(sk);
427
428 nr->t1 =
429 msecs_to_jiffies(sysctl_netrom_transport_timeout);
430 nr->t2 =
431 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
432 nr->n2 =
433 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
434 nr->t4 =
435 msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
436 nr->idle =
437 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
438 nr->window = sysctl_netrom_transport_requested_window_size;
439
440 nr->bpqext = 1;
441 nr->state = NR_STATE_0;
442
443 return 0;
444 }
445
446 static struct sock *nr_make_new(struct sock *osk)
447 {
448 struct sock *sk;
449 struct nr_sock *nr, *onr;
450
451 if (osk->sk_type != SOCK_SEQPACKET)
452 return NULL;
453
454 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL)
455 return NULL;
456
457 nr = nr_sk(sk);
458
459 sock_init_data(NULL, sk);
460
461 sk->sk_type = osk->sk_type;
462 sk->sk_socket = osk->sk_socket;
463 sk->sk_priority = osk->sk_priority;
464 sk->sk_protocol = osk->sk_protocol;
465 sk->sk_rcvbuf = osk->sk_rcvbuf;
466 sk->sk_sndbuf = osk->sk_sndbuf;
467 sk->sk_state = TCP_ESTABLISHED;
468 sk->sk_sleep = osk->sk_sleep;
469 sock_copy_flags(sk, osk);
470
471 skb_queue_head_init(&nr->ack_queue);
472 skb_queue_head_init(&nr->reseq_queue);
473 skb_queue_head_init(&nr->frag_queue);
474
475 nr_init_timers(sk);
476
477 onr = nr_sk(osk);
478
479 nr->t1 = onr->t1;
480 nr->t2 = onr->t2;
481 nr->n2 = onr->n2;
482 nr->t4 = onr->t4;
483 nr->idle = onr->idle;
484 nr->window = onr->window;
485
486 nr->device = onr->device;
487 nr->bpqext = onr->bpqext;
488
489 return sk;
490 }
491
492 static int nr_release(struct socket *sock)
493 {
494 struct sock *sk = sock->sk;
495 struct nr_sock *nr;
496
497 if (sk == NULL) return 0;
498
499 sock_hold(sk);
500 lock_sock(sk);
501 nr = nr_sk(sk);
502
503 switch (nr->state) {
504 case NR_STATE_0:
505 case NR_STATE_1:
506 case NR_STATE_2:
507 nr_disconnect(sk, 0);
508 nr_destroy_socket(sk);
509 break;
510
511 case NR_STATE_3:
512 nr_clear_queues(sk);
513 nr->n2count = 0;
514 nr_write_internal(sk, NR_DISCREQ);
515 nr_start_t1timer(sk);
516 nr_stop_t2timer(sk);
517 nr_stop_t4timer(sk);
518 nr_stop_idletimer(sk);
519 nr->state = NR_STATE_2;
520 sk->sk_state = TCP_CLOSE;
521 sk->sk_shutdown |= SEND_SHUTDOWN;
522 sk->sk_state_change(sk);
523 sock_orphan(sk);
524 sock_set_flag(sk, SOCK_DESTROY);
525 sk->sk_socket = NULL;
526 break;
527
528 default:
529 sk->sk_socket = NULL;
530 break;
531 }
532
533 sock->sk = NULL;
534 release_sock(sk);
535 sock_put(sk);
536
537 return 0;
538 }
539
540 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
541 {
542 struct sock *sk = sock->sk;
543 struct nr_sock *nr = nr_sk(sk);
544 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
545 struct net_device *dev;
546 ax25_uid_assoc *user;
547 ax25_address *source;
548
549 lock_sock(sk);
550 if (!sock_flag(sk, SOCK_ZAPPED)) {
551 release_sock(sk);
552 return -EINVAL;
553 }
554 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
555 release_sock(sk);
556 return -EINVAL;
557 }
558 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
559 release_sock(sk);
560 return -EINVAL;
561 }
562 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
563 release_sock(sk);
564 return -EINVAL;
565 }
566 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
567 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
568 release_sock(sk);
569 return -EADDRNOTAVAIL;
570 }
571
572 /*
573 * Only the super user can set an arbitrary user callsign.
574 */
575 if (addr->fsa_ax25.sax25_ndigis == 1) {
576 if (!capable(CAP_NET_BIND_SERVICE)) {
577 dev_put(dev);
578 release_sock(sk);
579 return -EACCES;
580 }
581 nr->user_addr = addr->fsa_digipeater[0];
582 nr->source_addr = addr->fsa_ax25.sax25_call;
583 } else {
584 source = &addr->fsa_ax25.sax25_call;
585
586 user = ax25_findbyuid(current->euid);
587 if (user) {
588 nr->user_addr = user->call;
589 ax25_uid_put(user);
590 } else {
591 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
592 release_sock(sk);
593 dev_put(dev);
594 return -EPERM;
595 }
596 nr->user_addr = *source;
597 }
598
599 nr->source_addr = *source;
600 }
601
602 nr->device = dev;
603 nr_insert_socket(sk);
604
605 sock_reset_flag(sk, SOCK_ZAPPED);
606 dev_put(dev);
607 release_sock(sk);
608 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
609 return 0;
610 }
611
612 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
613 int addr_len, int flags)
614 {
615 struct sock *sk = sock->sk;
616 struct nr_sock *nr = nr_sk(sk);
617 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
618 ax25_address *source = NULL;
619 ax25_uid_assoc *user;
620 struct net_device *dev;
621
622 lock_sock(sk);
623 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
624 sock->state = SS_CONNECTED;
625 release_sock(sk);
626 return 0; /* Connect completed during a ERESTARTSYS event */
627 }
628
629 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
630 sock->state = SS_UNCONNECTED;
631 release_sock(sk);
632 return -ECONNREFUSED;
633 }
634
635 if (sk->sk_state == TCP_ESTABLISHED) {
636 release_sock(sk);
637 return -EISCONN; /* No reconnect on a seqpacket socket */
638 }
639
640 sk->sk_state = TCP_CLOSE;
641 sock->state = SS_UNCONNECTED;
642
643 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
644 release_sock(sk);
645 return -EINVAL;
646 }
647 if (addr->sax25_family != AF_NETROM) {
648 release_sock(sk);
649 return -EINVAL;
650 }
651 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
652 sock_reset_flag(sk, SOCK_ZAPPED);
653
654 if ((dev = nr_dev_first()) == NULL) {
655 release_sock(sk);
656 return -ENETUNREACH;
657 }
658 source = (ax25_address *)dev->dev_addr;
659
660 user = ax25_findbyuid(current->euid);
661 if (user) {
662 nr->user_addr = user->call;
663 ax25_uid_put(user);
664 } else {
665 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
666 dev_put(dev);
667 release_sock(sk);
668 return -EPERM;
669 }
670 nr->user_addr = *source;
671 }
672
673 nr->source_addr = *source;
674 nr->device = dev;
675
676 dev_put(dev);
677 nr_insert_socket(sk); /* Finish the bind */
678 }
679
680 nr->dest_addr = addr->sax25_call;
681
682 release_sock(sk);
683 circuit = nr_find_next_circuit();
684 lock_sock(sk);
685
686 nr->my_index = circuit / 256;
687 nr->my_id = circuit % 256;
688
689 circuit++;
690
691 /* Move to connecting socket, start sending Connect Requests */
692 sock->state = SS_CONNECTING;
693 sk->sk_state = TCP_SYN_SENT;
694
695 nr_establish_data_link(sk);
696
697 nr->state = NR_STATE_1;
698
699 nr_start_heartbeat(sk);
700
701 /* Now the loop */
702 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
703 release_sock(sk);
704 return -EINPROGRESS;
705 }
706
707 /*
708 * A Connect Ack with Choke or timeout or failed routing will go to
709 * closed.
710 */
711 if (sk->sk_state == TCP_SYN_SENT) {
712 struct task_struct *tsk = current;
713 DECLARE_WAITQUEUE(wait, tsk);
714
715 add_wait_queue(sk->sk_sleep, &wait);
716 for (;;) {
717 set_current_state(TASK_INTERRUPTIBLE);
718 if (sk->sk_state != TCP_SYN_SENT)
719 break;
720 release_sock(sk);
721 if (!signal_pending(tsk)) {
722 schedule();
723 lock_sock(sk);
724 continue;
725 }
726 current->state = TASK_RUNNING;
727 remove_wait_queue(sk->sk_sleep, &wait);
728 return -ERESTARTSYS;
729 }
730 current->state = TASK_RUNNING;
731 remove_wait_queue(sk->sk_sleep, &wait);
732 }
733
734 if (sk->sk_state != TCP_ESTABLISHED) {
735 sock->state = SS_UNCONNECTED;
736 release_sock(sk);
737 return sock_error(sk); /* Always set at this point */
738 }
739
740 sock->state = SS_CONNECTED;
741 release_sock(sk);
742
743 return 0;
744 }
745
746 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
747 {
748 struct task_struct *tsk = current;
749 DECLARE_WAITQUEUE(wait, tsk);
750 struct sk_buff *skb;
751 struct sock *newsk;
752 struct sock *sk;
753 int err = 0;
754
755 if ((sk = sock->sk) == NULL)
756 return -EINVAL;
757
758 lock_sock(sk);
759 if (sk->sk_type != SOCK_SEQPACKET) {
760 err = -EOPNOTSUPP;
761 goto out;
762 }
763
764 if (sk->sk_state != TCP_LISTEN) {
765 err = -EINVAL;
766 goto out;
767 }
768
769 /*
770 * The write queue this time is holding sockets ready to use
771 * hooked into the SABM we saved
772 */
773 add_wait_queue(sk->sk_sleep, &wait);
774 for (;;) {
775 skb = skb_dequeue(&sk->sk_receive_queue);
776 if (skb)
777 break;
778
779 current->state = TASK_INTERRUPTIBLE;
780 release_sock(sk);
781 if (flags & O_NONBLOCK) {
782 current->state = TASK_RUNNING;
783 remove_wait_queue(sk->sk_sleep, &wait);
784 return -EWOULDBLOCK;
785 }
786 if (!signal_pending(tsk)) {
787 schedule();
788 lock_sock(sk);
789 continue;
790 }
791 current->state = TASK_RUNNING;
792 remove_wait_queue(sk->sk_sleep, &wait);
793 return -ERESTARTSYS;
794 }
795 current->state = TASK_RUNNING;
796 remove_wait_queue(sk->sk_sleep, &wait);
797
798 newsk = skb->sk;
799 newsk->sk_socket = newsock;
800 newsk->sk_sleep = &newsock->wait;
801
802 /* Now attach up the new socket */
803 kfree_skb(skb);
804 sk->sk_ack_backlog--;
805 newsock->sk = newsk;
806
807 out:
808 release_sock(sk);
809 return err;
810 }
811
812 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
813 int *uaddr_len, int peer)
814 {
815 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
816 struct sock *sk = sock->sk;
817 struct nr_sock *nr = nr_sk(sk);
818
819 lock_sock(sk);
820 if (peer != 0) {
821 if (sk->sk_state != TCP_ESTABLISHED) {
822 release_sock(sk);
823 return -ENOTCONN;
824 }
825 sax->fsa_ax25.sax25_family = AF_NETROM;
826 sax->fsa_ax25.sax25_ndigis = 1;
827 sax->fsa_ax25.sax25_call = nr->user_addr;
828 sax->fsa_digipeater[0] = nr->dest_addr;
829 *uaddr_len = sizeof(struct full_sockaddr_ax25);
830 } else {
831 sax->fsa_ax25.sax25_family = AF_NETROM;
832 sax->fsa_ax25.sax25_ndigis = 0;
833 sax->fsa_ax25.sax25_call = nr->source_addr;
834 *uaddr_len = sizeof(struct sockaddr_ax25);
835 }
836 release_sock(sk);
837
838 return 0;
839 }
840
841 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
842 {
843 struct sock *sk;
844 struct sock *make;
845 struct nr_sock *nr_make;
846 ax25_address *src, *dest, *user;
847 unsigned short circuit_index, circuit_id;
848 unsigned short peer_circuit_index, peer_circuit_id;
849 unsigned short frametype, flags, window, timeout;
850 int ret;
851
852 skb->sk = NULL; /* Initially we don't know who it's for */
853
854 /*
855 * skb->data points to the netrom frame start
856 */
857
858 src = (ax25_address *)(skb->data + 0);
859 dest = (ax25_address *)(skb->data + 7);
860
861 circuit_index = skb->data[15];
862 circuit_id = skb->data[16];
863 peer_circuit_index = skb->data[17];
864 peer_circuit_id = skb->data[18];
865 frametype = skb->data[19] & 0x0F;
866 flags = skb->data[19] & 0xF0;
867
868 /*
869 * Check for an incoming IP over NET/ROM frame.
870 */
871 if (frametype == NR_PROTOEXT &&
872 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
873 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
874 skb->h.raw = skb->data;
875
876 return nr_rx_ip(skb, dev);
877 }
878
879 /*
880 * Find an existing socket connection, based on circuit ID, if it's
881 * a Connect Request base it on their circuit ID.
882 *
883 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
884 * circuit that no longer exists at the other end ...
885 */
886
887 sk = NULL;
888
889 if (circuit_index == 0 && circuit_id == 0) {
890 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
891 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
892 } else {
893 if (frametype == NR_CONNREQ)
894 sk = nr_find_peer(circuit_index, circuit_id, src);
895 else
896 sk = nr_find_socket(circuit_index, circuit_id);
897 }
898
899 if (sk != NULL) {
900 skb->h.raw = skb->data;
901
902 if (frametype == NR_CONNACK && skb->len == 22)
903 nr_sk(sk)->bpqext = 1;
904 else
905 nr_sk(sk)->bpqext = 0;
906
907 ret = nr_process_rx_frame(sk, skb);
908 bh_unlock_sock(sk);
909 return ret;
910 }
911
912 /*
913 * Now it should be a CONNREQ.
914 */
915 if (frametype != NR_CONNREQ) {
916 /*
917 * Here it would be nice to be able to send a reset but
918 * NET/ROM doesn't have one. We've tried to extend the protocol
919 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
920 * apparently kills BPQ boxes... :-(
921 * So now we try to follow the established behaviour of
922 * G8PZT's Xrouter which is sending packets with command type 7
923 * as an extension of the protocol.
924 */
925 if (sysctl_netrom_reset_circuit &&
926 (frametype != NR_RESET || flags != 0))
927 nr_transmit_reset(skb, 1);
928
929 return 0;
930 }
931
932 sk = nr_find_listener(dest);
933
934 user = (ax25_address *)(skb->data + 21);
935
936 if (sk == NULL || sk_acceptq_is_full(sk) ||
937 (make = nr_make_new(sk)) == NULL) {
938 nr_transmit_refusal(skb, 0);
939 if (sk)
940 bh_unlock_sock(sk);
941 return 0;
942 }
943
944 window = skb->data[20];
945
946 skb->sk = make;
947 make->sk_state = TCP_ESTABLISHED;
948
949 /* Fill in his circuit details */
950 nr_make = nr_sk(make);
951 nr_make->source_addr = *dest;
952 nr_make->dest_addr = *src;
953 nr_make->user_addr = *user;
954
955 nr_make->your_index = circuit_index;
956 nr_make->your_id = circuit_id;
957
958 bh_unlock_sock(sk);
959 circuit = nr_find_next_circuit();
960 bh_lock_sock(sk);
961
962 nr_make->my_index = circuit / 256;
963 nr_make->my_id = circuit % 256;
964
965 circuit++;
966
967 /* Window negotiation */
968 if (window < nr_make->window)
969 nr_make->window = window;
970
971 /* L4 timeout negotiation */
972 if (skb->len == 37) {
973 timeout = skb->data[36] * 256 + skb->data[35];
974 if (timeout * HZ < nr_make->t1)
975 nr_make->t1 = timeout * HZ;
976 nr_make->bpqext = 1;
977 } else {
978 nr_make->bpqext = 0;
979 }
980
981 nr_write_internal(make, NR_CONNACK);
982
983 nr_make->condition = 0x00;
984 nr_make->vs = 0;
985 nr_make->va = 0;
986 nr_make->vr = 0;
987 nr_make->vl = 0;
988 nr_make->state = NR_STATE_3;
989 sk->sk_ack_backlog++;
990
991 nr_insert_socket(make);
992
993 skb_queue_head(&sk->sk_receive_queue, skb);
994
995 nr_start_heartbeat(make);
996 nr_start_idletimer(make);
997
998 if (!sock_flag(sk, SOCK_DEAD))
999 sk->sk_data_ready(sk, skb->len);
1000
1001 bh_unlock_sock(sk);
1002 return 1;
1003 }
1004
1005 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1006 struct msghdr *msg, size_t len)
1007 {
1008 struct sock *sk = sock->sk;
1009 struct nr_sock *nr = nr_sk(sk);
1010 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1011 int err;
1012 struct sockaddr_ax25 sax;
1013 struct sk_buff *skb;
1014 unsigned char *asmptr;
1015 int size;
1016
1017 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1018 return -EINVAL;
1019
1020 lock_sock(sk);
1021 if (sock_flag(sk, SOCK_ZAPPED)) {
1022 err = -EADDRNOTAVAIL;
1023 goto out;
1024 }
1025
1026 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1027 send_sig(SIGPIPE, current, 0);
1028 err = -EPIPE;
1029 goto out;
1030 }
1031
1032 if (nr->device == NULL) {
1033 err = -ENETUNREACH;
1034 goto out;
1035 }
1036
1037 if (usax) {
1038 if (msg->msg_namelen < sizeof(sax)) {
1039 err = -EINVAL;
1040 goto out;
1041 }
1042 sax = *usax;
1043 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1044 err = -EISCONN;
1045 goto out;
1046 }
1047 if (sax.sax25_family != AF_NETROM) {
1048 err = -EINVAL;
1049 goto out;
1050 }
1051 } else {
1052 if (sk->sk_state != TCP_ESTABLISHED) {
1053 err = -ENOTCONN;
1054 goto out;
1055 }
1056 sax.sax25_family = AF_NETROM;
1057 sax.sax25_call = nr->dest_addr;
1058 }
1059
1060 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1061
1062 /* Build a packet */
1063 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1064 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1065
1066 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1067 goto out;
1068
1069 skb_reserve(skb, size - len);
1070
1071 /*
1072 * Push down the NET/ROM header
1073 */
1074
1075 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1076 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1077
1078 /* Build a NET/ROM Transport header */
1079
1080 *asmptr++ = nr->your_index;
1081 *asmptr++ = nr->your_id;
1082 *asmptr++ = 0; /* To be filled in later */
1083 *asmptr++ = 0; /* Ditto */
1084 *asmptr++ = NR_INFO;
1085 SOCK_DEBUG(sk, "Built header.\n");
1086
1087 /*
1088 * Put the data on the end
1089 */
1090
1091 skb->h.raw = skb_put(skb, len);
1092
1093 asmptr = skb->h.raw;
1094 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1095
1096 /* User data follows immediately after the NET/ROM transport header */
1097 if (memcpy_fromiovec(asmptr, msg->msg_iov, len)) {
1098 kfree_skb(skb);
1099 err = -EFAULT;
1100 goto out;
1101 }
1102
1103 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1104
1105 if (sk->sk_state != TCP_ESTABLISHED) {
1106 kfree_skb(skb);
1107 err = -ENOTCONN;
1108 goto out;
1109 }
1110
1111 nr_output(sk, skb); /* Shove it onto the queue */
1112
1113 err = len;
1114 out:
1115 release_sock(sk);
1116 return err;
1117 }
1118
1119 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1120 struct msghdr *msg, size_t size, int flags)
1121 {
1122 struct sock *sk = sock->sk;
1123 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1124 size_t copied;
1125 struct sk_buff *skb;
1126 int er;
1127
1128 /*
1129 * This works for seqpacket too. The receiver has ordered the queue for
1130 * us! We do one quick check first though
1131 */
1132
1133 lock_sock(sk);
1134 if (sk->sk_state != TCP_ESTABLISHED) {
1135 release_sock(sk);
1136 return -ENOTCONN;
1137 }
1138
1139 /* Now we can treat all alike */
1140 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1141 release_sock(sk);
1142 return er;
1143 }
1144
1145 skb->h.raw = skb->data;
1146 copied = skb->len;
1147
1148 if (copied > size) {
1149 copied = size;
1150 msg->msg_flags |= MSG_TRUNC;
1151 }
1152
1153 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1154
1155 if (sax != NULL) {
1156 sax->sax25_family = AF_NETROM;
1157 memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN);
1158 }
1159
1160 msg->msg_namelen = sizeof(*sax);
1161
1162 skb_free_datagram(sk, skb);
1163
1164 release_sock(sk);
1165 return copied;
1166 }
1167
1168
1169 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1170 {
1171 struct sock *sk = sock->sk;
1172 void __user *argp = (void __user *)arg;
1173 int ret;
1174
1175 switch (cmd) {
1176 case TIOCOUTQ: {
1177 long amount;
1178
1179 lock_sock(sk);
1180 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1181 if (amount < 0)
1182 amount = 0;
1183 release_sock(sk);
1184 return put_user(amount, (int __user *)argp);
1185 }
1186
1187 case TIOCINQ: {
1188 struct sk_buff *skb;
1189 long amount = 0L;
1190
1191 lock_sock(sk);
1192 /* These two are safe on a single CPU system as only user tasks fiddle here */
1193 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1194 amount = skb->len;
1195 release_sock(sk);
1196 return put_user(amount, (int __user *)argp);
1197 }
1198
1199 case SIOCGSTAMP:
1200 lock_sock(sk);
1201 ret = sock_get_timestamp(sk, argp);
1202 release_sock(sk);
1203 return ret;
1204
1205 case SIOCGIFADDR:
1206 case SIOCSIFADDR:
1207 case SIOCGIFDSTADDR:
1208 case SIOCSIFDSTADDR:
1209 case SIOCGIFBRDADDR:
1210 case SIOCSIFBRDADDR:
1211 case SIOCGIFNETMASK:
1212 case SIOCSIFNETMASK:
1213 case SIOCGIFMETRIC:
1214 case SIOCSIFMETRIC:
1215 return -EINVAL;
1216
1217 case SIOCADDRT:
1218 case SIOCDELRT:
1219 case SIOCNRDECOBS:
1220 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1221 return nr_rt_ioctl(cmd, argp);
1222
1223 default:
1224 return -ENOIOCTLCMD;
1225 }
1226
1227 return 0;
1228 }
1229
1230 #ifdef CONFIG_PROC_FS
1231
1232 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1233 {
1234 struct sock *s;
1235 struct hlist_node *node;
1236 int i = 1;
1237
1238 spin_lock_bh(&nr_list_lock);
1239 if (*pos == 0)
1240 return SEQ_START_TOKEN;
1241
1242 sk_for_each(s, node, &nr_list) {
1243 if (i == *pos)
1244 return s;
1245 ++i;
1246 }
1247 return NULL;
1248 }
1249
1250 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1251 {
1252 ++*pos;
1253
1254 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1255 : sk_next((struct sock *)v);
1256 }
1257
1258 static void nr_info_stop(struct seq_file *seq, void *v)
1259 {
1260 spin_unlock_bh(&nr_list_lock);
1261 }
1262
1263 static int nr_info_show(struct seq_file *seq, void *v)
1264 {
1265 struct sock *s = v;
1266 struct net_device *dev;
1267 struct nr_sock *nr;
1268 const char *devname;
1269 char buf[11];
1270
1271 if (v == SEQ_START_TOKEN)
1272 seq_puts(seq,
1273 "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");
1274
1275 else {
1276
1277 bh_lock_sock(s);
1278 nr = nr_sk(s);
1279
1280 if ((dev = nr->device) == NULL)
1281 devname = "???";
1282 else
1283 devname = dev->name;
1284
1285 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1286 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1287 seq_printf(seq,
1288 "%-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",
1289 ax2asc(buf, &nr->source_addr),
1290 devname,
1291 nr->my_index,
1292 nr->my_id,
1293 nr->your_index,
1294 nr->your_id,
1295 nr->state,
1296 nr->vs,
1297 nr->vr,
1298 nr->va,
1299 ax25_display_timer(&nr->t1timer) / HZ,
1300 nr->t1 / HZ,
1301 ax25_display_timer(&nr->t2timer) / HZ,
1302 nr->t2 / HZ,
1303 ax25_display_timer(&nr->t4timer) / HZ,
1304 nr->t4 / HZ,
1305 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1306 nr->idle / (60 * HZ),
1307 nr->n2count,
1308 nr->n2,
1309 nr->window,
1310 atomic_read(&s->sk_wmem_alloc),
1311 atomic_read(&s->sk_rmem_alloc),
1312 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1313
1314 bh_unlock_sock(s);
1315 }
1316 return 0;
1317 }
1318
1319 static struct seq_operations nr_info_seqops = {
1320 .start = nr_info_start,
1321 .next = nr_info_next,
1322 .stop = nr_info_stop,
1323 .show = nr_info_show,
1324 };
1325
1326 static int nr_info_open(struct inode *inode, struct file *file)
1327 {
1328 return seq_open(file, &nr_info_seqops);
1329 }
1330
1331 static struct file_operations nr_info_fops = {
1332 .owner = THIS_MODULE,
1333 .open = nr_info_open,
1334 .read = seq_read,
1335 .llseek = seq_lseek,
1336 .release = seq_release,
1337 };
1338 #endif /* CONFIG_PROC_FS */
1339
1340 static struct net_proto_family nr_family_ops = {
1341 .family = PF_NETROM,
1342 .create = nr_create,
1343 .owner = THIS_MODULE,
1344 };
1345
1346 static const struct proto_ops nr_proto_ops = {
1347 .family = PF_NETROM,
1348 .owner = THIS_MODULE,
1349 .release = nr_release,
1350 .bind = nr_bind,
1351 .connect = nr_connect,
1352 .socketpair = sock_no_socketpair,
1353 .accept = nr_accept,
1354 .getname = nr_getname,
1355 .poll = datagram_poll,
1356 .ioctl = nr_ioctl,
1357 .listen = nr_listen,
1358 .shutdown = sock_no_shutdown,
1359 .setsockopt = nr_setsockopt,
1360 .getsockopt = nr_getsockopt,
1361 .sendmsg = nr_sendmsg,
1362 .recvmsg = nr_recvmsg,
1363 .mmap = sock_no_mmap,
1364 .sendpage = sock_no_sendpage,
1365 };
1366
1367 static struct notifier_block nr_dev_notifier = {
1368 .notifier_call = nr_device_event,
1369 };
1370
1371 static struct net_device **dev_nr;
1372
1373 static int __init nr_proto_init(void)
1374 {
1375 int i;
1376 int rc = proto_register(&nr_proto, 0);
1377
1378 if (rc != 0)
1379 goto out;
1380
1381 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1382 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1383 return -1;
1384 }
1385
1386 dev_nr = kmalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1387 if (dev_nr == NULL) {
1388 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1389 return -1;
1390 }
1391
1392 memset(dev_nr, 0x00, nr_ndevs * sizeof(struct net_device *));
1393
1394 for (i = 0; i < nr_ndevs; i++) {
1395 char name[IFNAMSIZ];
1396 struct net_device *dev;
1397
1398 sprintf(name, "nr%d", i);
1399 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
1400 if (!dev) {
1401 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1402 goto fail;
1403 }
1404
1405 dev->base_addr = i;
1406 if (register_netdev(dev)) {
1407 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1408 free_netdev(dev);
1409 goto fail;
1410 }
1411 dev_nr[i] = dev;
1412 }
1413
1414 if (sock_register(&nr_family_ops)) {
1415 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1416 goto fail;
1417 }
1418
1419 register_netdevice_notifier(&nr_dev_notifier);
1420
1421 ax25_protocol_register(AX25_P_NETROM, nr_route_frame);
1422 ax25_linkfail_register(nr_link_failed);
1423
1424 #ifdef CONFIG_SYSCTL
1425 nr_register_sysctl();
1426 #endif
1427
1428 nr_loopback_init();
1429
1430 proc_net_fops_create("nr", S_IRUGO, &nr_info_fops);
1431 proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops);
1432 proc_net_fops_create("nr_nodes", S_IRUGO, &nr_nodes_fops);
1433 out:
1434 return rc;
1435 fail:
1436 while (--i >= 0) {
1437 unregister_netdev(dev_nr[i]);
1438 free_netdev(dev_nr[i]);
1439 }
1440 kfree(dev_nr);
1441 proto_unregister(&nr_proto);
1442 rc = -1;
1443 goto out;
1444 }
1445
1446 module_init(nr_proto_init);
1447
1448 module_param(nr_ndevs, int, 0);
1449 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1450
1451 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1452 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1453 MODULE_LICENSE("GPL");
1454 MODULE_ALIAS_NETPROTO(PF_NETROM);
1455
1456 static void __exit nr_exit(void)
1457 {
1458 int i;
1459
1460 proc_net_remove("nr");
1461 proc_net_remove("nr_neigh");
1462 proc_net_remove("nr_nodes");
1463 nr_loopback_clear();
1464
1465 nr_rt_free();
1466
1467 #ifdef CONFIG_SYSCTL
1468 nr_unregister_sysctl();
1469 #endif
1470
1471 ax25_linkfail_release(nr_link_failed);
1472 ax25_protocol_release(AX25_P_NETROM);
1473
1474 unregister_netdevice_notifier(&nr_dev_notifier);
1475
1476 sock_unregister(PF_NETROM);
1477
1478 for (i = 0; i < nr_ndevs; i++) {
1479 struct net_device *dev = dev_nr[i];
1480 if (dev) {
1481 unregister_netdev(dev);
1482 free_netdev(dev);
1483 }
1484 }
1485
1486 kfree(dev_nr);
1487 proto_unregister(&nr_proto);
1488 }
1489 module_exit(nr_exit);
WRT350N Kernel Patches