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[PATCH] Clean up the old digi support and rescue it
[linux-2.6/linux-loongson.git] / net / netrom / af_netrom.c
blob4b53de982114d242706ba632960781190641c85a
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/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/sock.h>
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
33 #include <linux/fcntl.h>
34 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
35 #include <linux/mm.h>
36 #include <linux/interrupt.h>
37 #include <linux/notifier.h>
38 #include <net/netrom.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <net/ip.h>
42 #include <net/tcp_states.h>
43 #include <net/arp.h>
44 #include <linux/init.h>
45
46 static int nr_ndevs = 4;
47
48 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL;
49 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS;
50 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL;
51 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1;
52 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2;
53 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2;
54 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4;
55 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
56 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE;
57 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING;
58 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS;
59
60 static unsigned short circuit = 0x101;
61
62 static HLIST_HEAD(nr_list);
63 static DEFINE_SPINLOCK(nr_list_lock);
64
65 static struct proto_ops nr_proto_ops;
66
67 /*
68 * Socket removal during an interrupt is now safe.
69 */
70 static void nr_remove_socket(struct sock *sk)
71 {
72 spin_lock_bh(&nr_list_lock);
73 sk_del_node_init(sk);
74 spin_unlock_bh(&nr_list_lock);
75 }
76
77 /*
78 * Kill all bound sockets on a dropped device.
79 */
80 static void nr_kill_by_device(struct net_device *dev)
81 {
82 struct sock *s;
83 struct hlist_node *node;
84
85 spin_lock_bh(&nr_list_lock);
86 sk_for_each(s, node, &nr_list)
87 if (nr_sk(s)->device == dev)
88 nr_disconnect(s, ENETUNREACH);
89 spin_unlock_bh(&nr_list_lock);
90 }
91
92 /*
93 * Handle device status changes.
94 */
95 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
96 {
97 struct net_device *dev = (struct net_device *)ptr;
98
99 if (event != NETDEV_DOWN)
100 return NOTIFY_DONE;
101
102 nr_kill_by_device(dev);
103 nr_rt_device_down(dev);
104
105 return NOTIFY_DONE;
106 }
107
108 /*
109 * Add a socket to the bound sockets list.
110 */
111 static void nr_insert_socket(struct sock *sk)
112 {
113 spin_lock_bh(&nr_list_lock);
114 sk_add_node(sk, &nr_list);
115 spin_unlock_bh(&nr_list_lock);
116 }
117
118 /*
119 * Find a socket that wants to accept the Connect Request we just
120 * received.
121 */
122 static struct sock *nr_find_listener(ax25_address *addr)
123 {
124 struct sock *s;
125 struct hlist_node *node;
126
127 spin_lock_bh(&nr_list_lock);
128 sk_for_each(s, node, &nr_list)
129 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
130 s->sk_state == TCP_LISTEN) {
131 bh_lock_sock(s);
132 goto found;
133 }
134 s = NULL;
135 found:
136 spin_unlock_bh(&nr_list_lock);
137 return s;
138 }
139
140 /*
141 * Find a connected NET/ROM socket given my circuit IDs.
142 */
143 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
144 {
145 struct sock *s;
146 struct hlist_node *node;
147
148 spin_lock_bh(&nr_list_lock);
149 sk_for_each(s, node, &nr_list) {
150 struct nr_sock *nr = nr_sk(s);
151
152 if (nr->my_index == index && nr->my_id == id) {
153 bh_lock_sock(s);
154 goto found;
155 }
156 }
157 s = NULL;
158 found:
159 spin_unlock_bh(&nr_list_lock);
160 return s;
161 }
162
163 /*
164 * Find a connected NET/ROM socket given their circuit IDs.
165 */
166 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
167 ax25_address *dest)
168 {
169 struct sock *s;
170 struct hlist_node *node;
171
172 spin_lock_bh(&nr_list_lock);
173 sk_for_each(s, node, &nr_list) {
174 struct nr_sock *nr = nr_sk(s);
175
176 if (nr->your_index == index && nr->your_id == id &&
177 !ax25cmp(&nr->dest_addr, dest)) {
178 bh_lock_sock(s);
179 goto found;
180 }
181 }
182 s = NULL;
183 found:
184 spin_unlock_bh(&nr_list_lock);
185 return s;
186 }
187
188 /*
189 * Find next free circuit ID.
190 */
191 static unsigned short nr_find_next_circuit(void)
192 {
193 unsigned short id = circuit;
194 unsigned char i, j;
195 struct sock *sk;
196
197 for (;;) {
198 i = id / 256;
199 j = id % 256;
200
201 if (i != 0 && j != 0) {
202 if ((sk=nr_find_socket(i, j)) == NULL)
203 break;
204 bh_unlock_sock(sk);
205 }
206
207 id++;
208 }
209
210 return id;
211 }
212
213 /*
214 * Deferred destroy.
215 */
216 void nr_destroy_socket(struct sock *);
217
218 /*
219 * Handler for deferred kills.
220 */
221 static void nr_destroy_timer(unsigned long data)
222 {
223 struct sock *sk=(struct sock *)data;
224 bh_lock_sock(sk);
225 sock_hold(sk);
226 nr_destroy_socket(sk);
227 bh_unlock_sock(sk);
228 sock_put(sk);
229 }
230
231 /*
232 * This is called from user mode and the timers. Thus it protects itself
233 * against interrupt users but doesn't worry about being called during
234 * work. Once it is removed from the queue no interrupt or bottom half
235 * will touch it and we are (fairly 8-) ) safe.
236 */
237 void nr_destroy_socket(struct sock *sk)
238 {
239 struct sk_buff *skb;
240
241 nr_remove_socket(sk);
242
243 nr_stop_heartbeat(sk);
244 nr_stop_t1timer(sk);
245 nr_stop_t2timer(sk);
246 nr_stop_t4timer(sk);
247 nr_stop_idletimer(sk);
248
249 nr_clear_queues(sk); /* Flush the queues */
250
251 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
252 if (skb->sk != sk) { /* A pending connection */
253 /* Queue the unaccepted socket for death */
254 sock_set_flag(skb->sk, SOCK_DEAD);
255 nr_start_heartbeat(skb->sk);
256 nr_sk(skb->sk)->state = NR_STATE_0;
257 }
258
259 kfree_skb(skb);
260 }
261
262 if (atomic_read(&sk->sk_wmem_alloc) ||
263 atomic_read(&sk->sk_rmem_alloc)) {
264 /* Defer: outstanding buffers */
265 sk->sk_timer.function = nr_destroy_timer;
266 sk->sk_timer.expires = jiffies + 2 * HZ;
267 add_timer(&sk->sk_timer);
268 } else
269 sock_put(sk);
270 }
271
272 /*
273 * Handling for system calls applied via the various interfaces to a
274 * NET/ROM socket object.
275 */
276
277 static int nr_setsockopt(struct socket *sock, int level, int optname,
278 char __user *optval, int optlen)
279 {
280 struct sock *sk = sock->sk;
281 struct nr_sock *nr = nr_sk(sk);
282 int opt;
283
284 if (level != SOL_NETROM)
285 return -ENOPROTOOPT;
286
287 if (optlen < sizeof(int))
288 return -EINVAL;
289
290 if (get_user(opt, (int __user *)optval))
291 return -EFAULT;
292
293 switch (optname) {
294 case NETROM_T1:
295 if (opt < 1)
296 return -EINVAL;
297 nr->t1 = opt * HZ;
298 return 0;
299
300 case NETROM_T2:
301 if (opt < 1)
302 return -EINVAL;
303 nr->t2 = opt * HZ;
304 return 0;
305
306 case NETROM_N2:
307 if (opt < 1 || opt > 31)
308 return -EINVAL;
309 nr->n2 = opt;
310 return 0;
311
312 case NETROM_T4:
313 if (opt < 1)
314 return -EINVAL;
315 nr->t4 = opt * HZ;
316 return 0;
317
318 case NETROM_IDLE:
319 if (opt < 0)
320 return -EINVAL;
321 nr->idle = opt * 60 * HZ;
322 return 0;
323
324 default:
325 return -ENOPROTOOPT;
326 }
327 }
328
329 static int nr_getsockopt(struct socket *sock, int level, int optname,
330 char __user *optval, int __user *optlen)
331 {
332 struct sock *sk = sock->sk;
333 struct nr_sock *nr = nr_sk(sk);
334 int val = 0;
335 int len;
336
337 if (level != SOL_NETROM)
338 return -ENOPROTOOPT;
339
340 if (get_user(len, optlen))
341 return -EFAULT;
342
343 if (len < 0)
344 return -EINVAL;
345
346 switch (optname) {
347 case NETROM_T1:
348 val = nr->t1 / HZ;
349 break;
350
351 case NETROM_T2:
352 val = nr->t2 / HZ;
353 break;
354
355 case NETROM_N2:
356 val = nr->n2;
357 break;
358
359 case NETROM_T4:
360 val = nr->t4 / HZ;
361 break;
362
363 case NETROM_IDLE:
364 val = nr->idle / (60 * HZ);
365 break;
366
367 default:
368 return -ENOPROTOOPT;
369 }
370
371 len = min_t(unsigned int, len, sizeof(int));
372
373 if (put_user(len, optlen))
374 return -EFAULT;
375
376 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
377 }
378
379 static int nr_listen(struct socket *sock, int backlog)
380 {
381 struct sock *sk = sock->sk;
382
383 lock_sock(sk);
384 if (sk->sk_state != TCP_LISTEN) {
385 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
386 sk->sk_max_ack_backlog = backlog;
387 sk->sk_state = TCP_LISTEN;
388 release_sock(sk);
389 return 0;
390 }
391 release_sock(sk);
392
393 return -EOPNOTSUPP;
394 }
395
396 static struct proto nr_proto = {
397 .name = "NETROM",
398 .owner = THIS_MODULE,
399 .obj_size = sizeof(struct nr_sock),
400 };
401
402 static int nr_create(struct socket *sock, int protocol)
403 {
404 struct sock *sk;
405 struct nr_sock *nr;
406
407 if (sock->type != SOCK_SEQPACKET || protocol != 0)
408 return -ESOCKTNOSUPPORT;
409
410 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL)
411 return -ENOMEM;
412
413 nr = nr_sk(sk);
414
415 sock_init_data(sock, sk);
416
417 sock->ops = &nr_proto_ops;
418 sk->sk_protocol = protocol;
419
420 skb_queue_head_init(&nr->ack_queue);
421 skb_queue_head_init(&nr->reseq_queue);
422 skb_queue_head_init(&nr->frag_queue);
423
424 nr_init_timers(sk);
425
426 nr->t1 = sysctl_netrom_transport_timeout;
427 nr->t2 = sysctl_netrom_transport_acknowledge_delay;
428 nr->n2 = sysctl_netrom_transport_maximum_tries;
429 nr->t4 = sysctl_netrom_transport_busy_delay;
430 nr->idle = sysctl_netrom_transport_no_activity_timeout;
431 nr->window = sysctl_netrom_transport_requested_window_size;
432
433 nr->bpqext = 1;
434 nr->state = NR_STATE_0;
435
436 return 0;
437 }
438
439 static struct sock *nr_make_new(struct sock *osk)
440 {
441 struct sock *sk;
442 struct nr_sock *nr, *onr;
443
444 if (osk->sk_type != SOCK_SEQPACKET)
445 return NULL;
446
447 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL)
448 return NULL;
449
450 nr = nr_sk(sk);
451
452 sock_init_data(NULL, sk);
453
454 sk->sk_type = osk->sk_type;
455 sk->sk_socket = osk->sk_socket;
456 sk->sk_priority = osk->sk_priority;
457 sk->sk_protocol = osk->sk_protocol;
458 sk->sk_rcvbuf = osk->sk_rcvbuf;
459 sk->sk_sndbuf = osk->sk_sndbuf;
460 sk->sk_state = TCP_ESTABLISHED;
461 sk->sk_sleep = osk->sk_sleep;
462 sock_copy_flags(sk, osk);
463
464 skb_queue_head_init(&nr->ack_queue);
465 skb_queue_head_init(&nr->reseq_queue);
466 skb_queue_head_init(&nr->frag_queue);
467
468 nr_init_timers(sk);
469
470 onr = nr_sk(osk);
471
472 nr->t1 = onr->t1;
473 nr->t2 = onr->t2;
474 nr->n2 = onr->n2;
475 nr->t4 = onr->t4;
476 nr->idle = onr->idle;
477 nr->window = onr->window;
478
479 nr->device = onr->device;
480 nr->bpqext = onr->bpqext;
481
482 return sk;
483 }
484
485 static int nr_release(struct socket *sock)
486 {
487 struct sock *sk = sock->sk;
488 struct nr_sock *nr;
489
490 if (sk == NULL) return 0;
491
492 sock_hold(sk);
493 lock_sock(sk);
494 nr = nr_sk(sk);
495
496 switch (nr->state) {
497 case NR_STATE_0:
498 case NR_STATE_1:
499 case NR_STATE_2:
500 nr_disconnect(sk, 0);
501 nr_destroy_socket(sk);
502 break;
503
504 case NR_STATE_3:
505 nr_clear_queues(sk);
506 nr->n2count = 0;
507 nr_write_internal(sk, NR_DISCREQ);
508 nr_start_t1timer(sk);
509 nr_stop_t2timer(sk);
510 nr_stop_t4timer(sk);
511 nr_stop_idletimer(sk);
512 nr->state = NR_STATE_2;
513 sk->sk_state = TCP_CLOSE;
514 sk->sk_shutdown |= SEND_SHUTDOWN;
515 sk->sk_state_change(sk);
516 sock_orphan(sk);
517 sock_set_flag(sk, SOCK_DESTROY);
518 sk->sk_socket = NULL;
519 break;
520
521 default:
522 sk->sk_socket = NULL;
523 break;
524 }
525
526 sock->sk = NULL;
527 release_sock(sk);
528 sock_put(sk);
529
530 return 0;
531 }
532
533 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
534 {
535 struct sock *sk = sock->sk;
536 struct nr_sock *nr = nr_sk(sk);
537 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
538 struct net_device *dev;
539 ax25_uid_assoc *user;
540 ax25_address *source;
541
542 lock_sock(sk);
543 if (!sock_flag(sk, SOCK_ZAPPED)) {
544 release_sock(sk);
545 return -EINVAL;
546 }
547 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
548 release_sock(sk);
549 return -EINVAL;
550 }
551 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
552 release_sock(sk);
553 return -EINVAL;
554 }
555 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
556 release_sock(sk);
557 return -EINVAL;
558 }
559 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
560 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
561 release_sock(sk);
562 return -EADDRNOTAVAIL;
563 }
564
565 /*
566 * Only the super user can set an arbitrary user callsign.
567 */
568 if (addr->fsa_ax25.sax25_ndigis == 1) {
569 if (!capable(CAP_NET_BIND_SERVICE)) {
570 dev_put(dev);
571 release_sock(sk);
572 return -EACCES;
573 }
574 nr->user_addr = addr->fsa_digipeater[0];
575 nr->source_addr = addr->fsa_ax25.sax25_call;
576 } else {
577 source = &addr->fsa_ax25.sax25_call;
578
579 user = ax25_findbyuid(current->euid);
580 if (user) {
581 nr->user_addr = user->call;
582 ax25_uid_put(user);
583 } else {
584 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
585 release_sock(sk);
586 dev_put(dev);
587 return -EPERM;
588 }
589 nr->user_addr = *source;
590 }
591
592 nr->source_addr = *source;
593 }
594
595 nr->device = dev;
596 nr_insert_socket(sk);
597
598 sock_reset_flag(sk, SOCK_ZAPPED);
599 dev_put(dev);
600 release_sock(sk);
601 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
602 return 0;
603 }
604
605 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
606 int addr_len, int flags)
607 {
608 struct sock *sk = sock->sk;
609 struct nr_sock *nr = nr_sk(sk);
610 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
611 ax25_address *source = NULL;
612 ax25_uid_assoc *user;
613 struct net_device *dev;
614
615 lock_sock(sk);
616 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
617 sock->state = SS_CONNECTED;
618 release_sock(sk);
619 return 0; /* Connect completed during a ERESTARTSYS event */
620 }
621
622 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
623 sock->state = SS_UNCONNECTED;
624 release_sock(sk);
625 return -ECONNREFUSED;
626 }
627
628 if (sk->sk_state == TCP_ESTABLISHED) {
629 release_sock(sk);
630 return -EISCONN; /* No reconnect on a seqpacket socket */
631 }
632
633 sk->sk_state = TCP_CLOSE;
634 sock->state = SS_UNCONNECTED;
635
636 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
637 release_sock(sk);
638 return -EINVAL;
639 }
640 if (addr->sax25_family != AF_NETROM) {
641 release_sock(sk);
642 return -EINVAL;
643 }
644 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */
645 sock_reset_flag(sk, SOCK_ZAPPED);
646
647 if ((dev = nr_dev_first()) == NULL) {
648 release_sock(sk);
649 return -ENETUNREACH;
650 }
651 source = (ax25_address *)dev->dev_addr;
652
653 user = ax25_findbyuid(current->euid);
654 if (user) {
655 nr->user_addr = user->call;
656 ax25_uid_put(user);
657 } else {
658 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
659 dev_put(dev);
660 release_sock(sk);
661 return -EPERM;
662 }
663 nr->user_addr = *source;
664 }
665
666 nr->source_addr = *source;
667 nr->device = dev;
668
669 dev_put(dev);
670 nr_insert_socket(sk); /* Finish the bind */
671 }
672
673 nr->dest_addr = addr->sax25_call;
674
675 release_sock(sk);
676 circuit = nr_find_next_circuit();
677 lock_sock(sk);
678
679 nr->my_index = circuit / 256;
680 nr->my_id = circuit % 256;
681
682 circuit++;
683
684 /* Move to connecting socket, start sending Connect Requests */
685 sock->state = SS_CONNECTING;
686 sk->sk_state = TCP_SYN_SENT;
687
688 nr_establish_data_link(sk);
689
690 nr->state = NR_STATE_1;
691
692 nr_start_heartbeat(sk);
693
694 /* Now the loop */
695 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
696 release_sock(sk);
697 return -EINPROGRESS;
698 }
699
700 /*
701 * A Connect Ack with Choke or timeout or failed routing will go to
702 * closed.
703 */
704 if (sk->sk_state == TCP_SYN_SENT) {
705 struct task_struct *tsk = current;
706 DECLARE_WAITQUEUE(wait, tsk);
707
708 add_wait_queue(sk->sk_sleep, &wait);
709 for (;;) {
710 set_current_state(TASK_INTERRUPTIBLE);
711 if (sk->sk_state != TCP_SYN_SENT)
712 break;
713 release_sock(sk);
714 if (!signal_pending(tsk)) {
715 schedule();
716 lock_sock(sk);
717 continue;
718 }
719 current->state = TASK_RUNNING;
720 remove_wait_queue(sk->sk_sleep, &wait);
721 return -ERESTARTSYS;
722 }
723 current->state = TASK_RUNNING;
724 remove_wait_queue(sk->sk_sleep, &wait);
725 }
726
727 if (sk->sk_state != TCP_ESTABLISHED) {
728 sock->state = SS_UNCONNECTED;
729 release_sock(sk);
730 return sock_error(sk); /* Always set at this point */
731 }
732
733 sock->state = SS_CONNECTED;
734 release_sock(sk);
735
736 return 0;
737 }
738
739 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
740 {
741 struct task_struct *tsk = current;
742 DECLARE_WAITQUEUE(wait, tsk);
743 struct sk_buff *skb;
744 struct sock *newsk;
745 struct sock *sk;
746 int err = 0;
747
748 if ((sk = sock->sk) == NULL)
749 return -EINVAL;
750
751 lock_sock(sk);
752 if (sk->sk_type != SOCK_SEQPACKET) {
753 err = -EOPNOTSUPP;
754 goto out;
755 }
756
757 if (sk->sk_state != TCP_LISTEN) {
758 err = -EINVAL;
759 goto out;
760 }
761
762 /*
763 * The write queue this time is holding sockets ready to use
764 * hooked into the SABM we saved
765 */
766 add_wait_queue(sk->sk_sleep, &wait);
767 for (;;) {
768 skb = skb_dequeue(&sk->sk_receive_queue);
769 if (skb)
770 break;
771
772 current->state = TASK_INTERRUPTIBLE;
773 release_sock(sk);
774 if (flags & O_NONBLOCK) {
775 current->state = TASK_RUNNING;
776 remove_wait_queue(sk->sk_sleep, &wait);
777 return -EWOULDBLOCK;
778 }
779 if (!signal_pending(tsk)) {
780 schedule();
781 lock_sock(sk);
782 continue;
783 }
784 current->state = TASK_RUNNING;
785 remove_wait_queue(sk->sk_sleep, &wait);
786 return -ERESTARTSYS;
787 }
788 current->state = TASK_RUNNING;
789 remove_wait_queue(sk->sk_sleep, &wait);
790
791 newsk = skb->sk;
792 newsk->sk_socket = newsock;
793 newsk->sk_sleep = &newsock->wait;
794
795 /* Now attach up the new socket */
796 kfree_skb(skb);
797 sk->sk_ack_backlog--;
798 newsock->sk = newsk;
799
800 out:
801 release_sock(sk);
802 return err;
803 }
804
805 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
806 int *uaddr_len, int peer)
807 {
808 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
809 struct sock *sk = sock->sk;
810 struct nr_sock *nr = nr_sk(sk);
811
812 lock_sock(sk);
813 if (peer != 0) {
814 if (sk->sk_state != TCP_ESTABLISHED) {
815 release_sock(sk);
816 return -ENOTCONN;
817 }
818 sax->fsa_ax25.sax25_family = AF_NETROM;
819 sax->fsa_ax25.sax25_ndigis = 1;
820 sax->fsa_ax25.sax25_call = nr->user_addr;
821 sax->fsa_digipeater[0] = nr->dest_addr;
822 *uaddr_len = sizeof(struct full_sockaddr_ax25);
823 } else {
824 sax->fsa_ax25.sax25_family = AF_NETROM;
825 sax->fsa_ax25.sax25_ndigis = 0;
826 sax->fsa_ax25.sax25_call = nr->source_addr;
827 *uaddr_len = sizeof(struct sockaddr_ax25);
828 }
829 release_sock(sk);
830
831 return 0;
832 }
833
834 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
835 {
836 struct sock *sk;
837 struct sock *make;
838 struct nr_sock *nr_make;
839 ax25_address *src, *dest, *user;
840 unsigned short circuit_index, circuit_id;
841 unsigned short peer_circuit_index, peer_circuit_id;
842 unsigned short frametype, flags, window, timeout;
843 int ret;
844
845 skb->sk = NULL; /* Initially we don't know who it's for */
846
847 /*
848 * skb->data points to the netrom frame start
849 */
850
851 src = (ax25_address *)(skb->data + 0);
852 dest = (ax25_address *)(skb->data + 7);
853
854 circuit_index = skb->data[15];
855 circuit_id = skb->data[16];
856 peer_circuit_index = skb->data[17];
857 peer_circuit_id = skb->data[18];
858 frametype = skb->data[19] & 0x0F;
859 flags = skb->data[19] & 0xF0;
860
861 /*
862 * Check for an incoming IP over NET/ROM frame.
863 */
864 if (frametype == NR_PROTOEXT &&
865 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
866 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
867 skb->h.raw = skb->data;
868
869 return nr_rx_ip(skb, dev);
870 }
871
872 /*
873 * Find an existing socket connection, based on circuit ID, if it's
874 * a Connect Request base it on their circuit ID.
875 *
876 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
877 * circuit that no longer exists at the other end ...
878 */
879
880 sk = NULL;
881
882 if (circuit_index == 0 && circuit_id == 0) {
883 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
884 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
885 } else {
886 if (frametype == NR_CONNREQ)
887 sk = nr_find_peer(circuit_index, circuit_id, src);
888 else
889 sk = nr_find_socket(circuit_index, circuit_id);
890 }
891
892 if (sk != NULL) {
893 skb->h.raw = skb->data;
894
895 if (frametype == NR_CONNACK && skb->len == 22)
896 nr_sk(sk)->bpqext = 1;
897 else
898 nr_sk(sk)->bpqext = 0;
899
900 ret = nr_process_rx_frame(sk, skb);
901 bh_unlock_sock(sk);
902 return ret;
903 }
904
905 /*
906 * Now it should be a CONNREQ.
907 */
908 if (frametype != NR_CONNREQ) {
909 /*
910 * Here it would be nice to be able to send a reset but
911 * NET/ROM doesn't have one. The following hack would
912 * have been a way to extend the protocol but apparently
913 * it kills BPQ boxes... :-(
914 */
915 #if 0
916 /*
917 * Never reply to a CONNACK/CHOKE.
918 */
919 if (frametype != NR_CONNACK || flags != NR_CHOKE_FLAG)
920 nr_transmit_refusal(skb, 1);
921 #endif
922 return 0;
923 }
924
925 sk = nr_find_listener(dest);
926
927 user = (ax25_address *)(skb->data + 21);
928
929 if (sk == NULL || sk_acceptq_is_full(sk) ||
930 (make = nr_make_new(sk)) == NULL) {
931 nr_transmit_refusal(skb, 0);
932 if (sk)
933 bh_unlock_sock(sk);
934 return 0;
935 }
936
937 window = skb->data[20];
938
939 skb->sk = make;
940 make->sk_state = TCP_ESTABLISHED;
941
942 /* Fill in his circuit details */
943 nr_make = nr_sk(make);
944 nr_make->source_addr = *dest;
945 nr_make->dest_addr = *src;
946 nr_make->user_addr = *user;
947
948 nr_make->your_index = circuit_index;
949 nr_make->your_id = circuit_id;
950
951 bh_unlock_sock(sk);
952 circuit = nr_find_next_circuit();
953 bh_lock_sock(sk);
954
955 nr_make->my_index = circuit / 256;
956 nr_make->my_id = circuit % 256;
957
958 circuit++;
959
960 /* Window negotiation */
961 if (window < nr_make->window)
962 nr_make->window = window;
963
964 /* L4 timeout negotiation */
965 if (skb->len == 37) {
966 timeout = skb->data[36] * 256 + skb->data[35];
967 if (timeout * HZ < nr_make->t1)
968 nr_make->t1 = timeout * HZ;
969 nr_make->bpqext = 1;
970 } else {
971 nr_make->bpqext = 0;
972 }
973
974 nr_write_internal(make, NR_CONNACK);
975
976 nr_make->condition = 0x00;
977 nr_make->vs = 0;
978 nr_make->va = 0;
979 nr_make->vr = 0;
980 nr_make->vl = 0;
981 nr_make->state = NR_STATE_3;
982 sk->sk_ack_backlog++;
983
984 nr_insert_socket(make);
985
986 skb_queue_head(&sk->sk_receive_queue, skb);
987
988 nr_start_heartbeat(make);
989 nr_start_idletimer(make);
990
991 if (!sock_flag(sk, SOCK_DEAD))
992 sk->sk_data_ready(sk, skb->len);
993
994 bh_unlock_sock(sk);
995 return 1;
996 }
997
998 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
999 struct msghdr *msg, size_t len)
1000 {
1001 struct sock *sk = sock->sk;
1002 struct nr_sock *nr = nr_sk(sk);
1003 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1004 int err;
1005 struct sockaddr_ax25 sax;
1006 struct sk_buff *skb;
1007 unsigned char *asmptr;
1008 int size;
1009
1010 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1011 return -EINVAL;
1012
1013 lock_sock(sk);
1014 if (sock_flag(sk, SOCK_ZAPPED)) {
1015 err = -EADDRNOTAVAIL;
1016 goto out;
1017 }
1018
1019 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1020 send_sig(SIGPIPE, current, 0);
1021 err = -EPIPE;
1022 goto out;
1023 }
1024
1025 if (nr->device == NULL) {
1026 err = -ENETUNREACH;
1027 goto out;
1028 }
1029
1030 if (usax) {
1031 if (msg->msg_namelen < sizeof(sax)) {
1032 err = -EINVAL;
1033 goto out;
1034 }
1035 sax = *usax;
1036 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1037 err = -EISCONN;
1038 goto out;
1039 }
1040 if (sax.sax25_family != AF_NETROM) {
1041 err = -EINVAL;
1042 goto out;
1043 }
1044 } else {
1045 if (sk->sk_state != TCP_ESTABLISHED) {
1046 err = -ENOTCONN;
1047 goto out;
1048 }
1049 sax.sax25_family = AF_NETROM;
1050 sax.sax25_call = nr->dest_addr;
1051 }
1052
1053 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1054
1055 /* Build a packet */
1056 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1057 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1058
1059 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1060 goto out;
1061
1062 skb_reserve(skb, size - len);
1063
1064 /*
1065 * Push down the NET/ROM header
1066 */
1067
1068 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1069 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1070
1071 /* Build a NET/ROM Transport header */
1072
1073 *asmptr++ = nr->your_index;
1074 *asmptr++ = nr->your_id;
1075 *asmptr++ = 0; /* To be filled in later */
1076 *asmptr++ = 0; /* Ditto */
1077 *asmptr++ = NR_INFO;
1078 SOCK_DEBUG(sk, "Built header.\n");
1079
1080 /*
1081 * Put the data on the end
1082 */
1083
1084 skb->h.raw = skb_put(skb, len);
1085
1086 asmptr = skb->h.raw;
1087 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1088
1089 /* User data follows immediately after the NET/ROM transport header */
1090 if (memcpy_fromiovec(asmptr, msg->msg_iov, len)) {
1091 kfree_skb(skb);
1092 err = -EFAULT;
1093 goto out;
1094 }
1095
1096 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1097
1098 if (sk->sk_state != TCP_ESTABLISHED) {
1099 kfree_skb(skb);
1100 err = -ENOTCONN;
1101 goto out;
1102 }
1103
1104 nr_output(sk, skb); /* Shove it onto the queue */
1105
1106 err = len;
1107 out:
1108 release_sock(sk);
1109 return err;
1110 }
1111
1112 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1113 struct msghdr *msg, size_t size, int flags)
1114 {
1115 struct sock *sk = sock->sk;
1116 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1117 size_t copied;
1118 struct sk_buff *skb;
1119 int er;
1120
1121 /*
1122 * This works for seqpacket too. The receiver has ordered the queue for
1123 * us! We do one quick check first though
1124 */
1125
1126 lock_sock(sk);
1127 if (sk->sk_state != TCP_ESTABLISHED) {
1128 release_sock(sk);
1129 return -ENOTCONN;
1130 }
1131
1132 /* Now we can treat all alike */
1133 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1134 release_sock(sk);
1135 return er;
1136 }
1137
1138 skb->h.raw = skb->data;
1139 copied = skb->len;
1140
1141 if (copied > size) {
1142 copied = size;
1143 msg->msg_flags |= MSG_TRUNC;
1144 }
1145
1146 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1147
1148 if (sax != NULL) {
1149 sax->sax25_family = AF_NETROM;
1150 memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN);
1151 }
1152
1153 msg->msg_namelen = sizeof(*sax);
1154
1155 skb_free_datagram(sk, skb);
1156
1157 release_sock(sk);
1158 return copied;
1159 }
1160
1161
1162 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1163 {
1164 struct sock *sk = sock->sk;
1165 void __user *argp = (void __user *)arg;
1166 int ret;
1167
1168 lock_sock(sk);
1169 switch (cmd) {
1170 case TIOCOUTQ: {
1171 long amount;
1172 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1173 if (amount < 0)
1174 amount = 0;
1175 release_sock(sk);
1176 return put_user(amount, (int __user *)argp);
1177 }
1178
1179 case TIOCINQ: {
1180 struct sk_buff *skb;
1181 long amount = 0L;
1182 /* These two are safe on a single CPU system as only user tasks fiddle here */
1183 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1184 amount = skb->len;
1185 release_sock(sk);
1186 return put_user(amount, (int __user *)argp);
1187 }
1188
1189 case SIOCGSTAMP:
1190 ret = -EINVAL;
1191 if (sk != NULL)
1192 ret = sock_get_timestamp(sk, argp);
1193 release_sock(sk);
1194 return ret;
1195
1196 case SIOCGIFADDR:
1197 case SIOCSIFADDR:
1198 case SIOCGIFDSTADDR:
1199 case SIOCSIFDSTADDR:
1200 case SIOCGIFBRDADDR:
1201 case SIOCSIFBRDADDR:
1202 case SIOCGIFNETMASK:
1203 case SIOCSIFNETMASK:
1204 case SIOCGIFMETRIC:
1205 case SIOCSIFMETRIC:
1206 release_sock(sk);
1207 return -EINVAL;
1208
1209 case SIOCADDRT:
1210 case SIOCDELRT:
1211 case SIOCNRDECOBS:
1212 release_sock(sk);
1213 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1214 return nr_rt_ioctl(cmd, argp);
1215
1216 default:
1217 release_sock(sk);
1218 return dev_ioctl(cmd, argp);
1219 }
1220 release_sock(sk);
1221
1222 return 0;
1223 }
1224
1225 #ifdef CONFIG_PROC_FS
1226
1227 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1228 {
1229 struct sock *s;
1230 struct hlist_node *node;
1231 int i = 1;
1232
1233 spin_lock_bh(&nr_list_lock);
1234 if (*pos == 0)
1235 return SEQ_START_TOKEN;
1236
1237 sk_for_each(s, node, &nr_list) {
1238 if (i == *pos)
1239 return s;
1240 ++i;
1241 }
1242 return NULL;
1243 }
1244
1245 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1246 {
1247 ++*pos;
1248
1249 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1250 : sk_next((struct sock *)v);
1251 }
1252
1253 static void nr_info_stop(struct seq_file *seq, void *v)
1254 {
1255 spin_unlock_bh(&nr_list_lock);
1256 }
1257
1258 static int nr_info_show(struct seq_file *seq, void *v)
1259 {
1260 struct sock *s = v;
1261 struct net_device *dev;
1262 struct nr_sock *nr;
1263 const char *devname;
1264
1265 if (v == SEQ_START_TOKEN)
1266 seq_puts(seq,
1267 "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");
1268
1269 else {
1270
1271 bh_lock_sock(s);
1272 nr = nr_sk(s);
1273
1274 if ((dev = nr->device) == NULL)
1275 devname = "???";
1276 else
1277 devname = dev->name;
1278
1279 seq_printf(seq, "%-9s ", ax2asc(&nr->user_addr));
1280 seq_printf(seq, "%-9s ", ax2asc(&nr->dest_addr));
1281 seq_printf(seq,
1282 "%-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",
1283 ax2asc(&nr->source_addr),
1284 devname,
1285 nr->my_index,
1286 nr->my_id,
1287 nr->your_index,
1288 nr->your_id,
1289 nr->state,
1290 nr->vs,
1291 nr->vr,
1292 nr->va,
1293 ax25_display_timer(&nr->t1timer) / HZ,
1294 nr->t1 / HZ,
1295 ax25_display_timer(&nr->t2timer) / HZ,
1296 nr->t2 / HZ,
1297 ax25_display_timer(&nr->t4timer) / HZ,
1298 nr->t4 / HZ,
1299 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1300 nr->idle / (60 * HZ),
1301 nr->n2count,
1302 nr->n2,
1303 nr->window,
1304 atomic_read(&s->sk_wmem_alloc),
1305 atomic_read(&s->sk_rmem_alloc),
1306 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1307
1308 bh_unlock_sock(s);
1309 }
1310 return 0;
1311 }
1312
1313 static struct seq_operations nr_info_seqops = {
1314 .start = nr_info_start,
1315 .next = nr_info_next,
1316 .stop = nr_info_stop,
1317 .show = nr_info_show,
1318 };
1319
1320 static int nr_info_open(struct inode *inode, struct file *file)
1321 {
1322 return seq_open(file, &nr_info_seqops);
1323 }
1324
1325 static struct file_operations nr_info_fops = {
1326 .owner = THIS_MODULE,
1327 .open = nr_info_open,
1328 .read = seq_read,
1329 .llseek = seq_lseek,
1330 .release = seq_release,
1331 };
1332 #endif /* CONFIG_PROC_FS */
1333
1334 static struct net_proto_family nr_family_ops = {
1335 .family = PF_NETROM,
1336 .create = nr_create,
1337 .owner = THIS_MODULE,
1338 };
1339
1340 static struct proto_ops nr_proto_ops = {
1341 .family = PF_NETROM,
1342 .owner = THIS_MODULE,
1343 .release = nr_release,
1344 .bind = nr_bind,
1345 .connect = nr_connect,
1346 .socketpair = sock_no_socketpair,
1347 .accept = nr_accept,
1348 .getname = nr_getname,
1349 .poll = datagram_poll,
1350 .ioctl = nr_ioctl,
1351 .listen = nr_listen,
1352 .shutdown = sock_no_shutdown,
1353 .setsockopt = nr_setsockopt,
1354 .getsockopt = nr_getsockopt,
1355 .sendmsg = nr_sendmsg,
1356 .recvmsg = nr_recvmsg,
1357 .mmap = sock_no_mmap,
1358 .sendpage = sock_no_sendpage,
1359 };
1360
1361 static struct notifier_block nr_dev_notifier = {
1362 .notifier_call = nr_device_event,
1363 };
1364
1365 static struct net_device **dev_nr;
1366
1367 static char banner[] __initdata = KERN_INFO "G4KLX NET/ROM for Linux. Version 0.7 for AX25.037 Linux 2.4\n";
1368
1369 static int __init nr_proto_init(void)
1370 {
1371 int i;
1372 int rc = proto_register(&nr_proto, 0);
1373
1374 if (rc != 0)
1375 goto out;
1376
1377 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1378 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1379 return -1;
1380 }
1381
1382 dev_nr = kmalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1383 if (dev_nr == NULL) {
1384 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1385 return -1;
1386 }
1387
1388 memset(dev_nr, 0x00, nr_ndevs * sizeof(struct net_device *));
1389
1390 for (i = 0; i < nr_ndevs; i++) {
1391 char name[IFNAMSIZ];
1392 struct net_device *dev;
1393
1394 sprintf(name, "nr%d", i);
1395 dev = alloc_netdev(sizeof(struct net_device_stats), name,
1396 nr_setup);
1397 if (!dev) {
1398 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1399 goto fail;
1400 }
1401
1402 dev->base_addr = i;
1403 if (register_netdev(dev)) {
1404 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1405 free_netdev(dev);
1406 goto fail;
1407 }
1408 dev_nr[i] = dev;
1409 }
1410
1411 if (sock_register(&nr_family_ops)) {
1412 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1413 goto fail;
1414 }
1415
1416 register_netdevice_notifier(&nr_dev_notifier);
1417 printk(banner);
1418
1419 ax25_protocol_register(AX25_P_NETROM, nr_route_frame);
1420 ax25_linkfail_register(nr_link_failed);
1421
1422 #ifdef CONFIG_SYSCTL
1423 nr_register_sysctl();
1424 #endif
1425
1426 nr_loopback_init();
1427
1428 proc_net_fops_create("nr", S_IRUGO, &nr_info_fops);
1429 proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops);
1430 proc_net_fops_create("nr_nodes", S_IRUGO, &nr_nodes_fops);
1431 out:
1432 return rc;
1433 fail:
1434 while (--i >= 0) {
1435 unregister_netdev(dev_nr[i]);
1436 free_netdev(dev_nr[i]);
1437 }
1438 kfree(dev_nr);
1439 proto_unregister(&nr_proto);
1440 rc = -1;
1441 goto out;
1442 }
1443
1444 module_init(nr_proto_init);
1445
1446 module_param(nr_ndevs, int, 0);
1447 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1448
1449 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1450 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1451 MODULE_LICENSE("GPL");
1452 MODULE_ALIAS_NETPROTO(PF_NETROM);
1453
1454 static void __exit nr_exit(void)
1455 {
1456 int i;
1457
1458 proc_net_remove("nr");
1459 proc_net_remove("nr_neigh");
1460 proc_net_remove("nr_nodes");
1461 nr_loopback_clear();
1462
1463 nr_rt_free();
1464
1465 #ifdef CONFIG_SYSCTL
1466 nr_unregister_sysctl();
1467 #endif
1468
1469 ax25_linkfail_release(nr_link_failed);
1470 ax25_protocol_release(AX25_P_NETROM);
1471
1472 unregister_netdevice_notifier(&nr_dev_notifier);
1473
1474 sock_unregister(PF_NETROM);
1475
1476 for (i = 0; i < nr_ndevs; i++) {
1477 struct net_device *dev = dev_nr[i];
1478 if (dev) {
1479 unregister_netdev(dev);
1480 free_netdev(dev);
1481 }
1482 }
1483
1484 kfree(dev_nr);
1485 proto_unregister(&nr_proto);
1486 }
1487 module_exit(nr_exit);
linux kernel for loongson