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.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 void nr_init_timers(struct sock *sk);
67
68 static struct sock *nr_alloc_sock(void)
69 {
70 nr_cb *nr;
71 struct sock *sk = sk_alloc(PF_NETROM, GFP_ATOMIC, 1, NULL);
72
73 if (!sk)
74 goto out;
75
76 nr = sk->sk_protinfo = kmalloc(sizeof(*nr), GFP_ATOMIC);
77 if (!nr)
78 goto frees;
79
80 memset(nr, 0x00, sizeof(*nr));
81 nr->sk = sk;
82 out:
83 return sk;
84 frees:
85 sk_free(sk);
86 sk = NULL;
87 goto out;
88 }
89
90 /*
91 * Socket removal during an interrupt is now safe.
92 */
93 static void nr_remove_socket(struct sock *sk)
94 {
95 spin_lock_bh(&nr_list_lock);
96 sk_del_node_init(sk);
97 spin_unlock_bh(&nr_list_lock);
98 }
99
100 /*
101 * Kill all bound sockets on a dropped device.
102 */
103 static void nr_kill_by_device(struct net_device *dev)
104 {
105 struct sock *s;
106 struct hlist_node *node;
107
108 spin_lock_bh(&nr_list_lock);
109 sk_for_each(s, node, &nr_list)
110 if (nr_sk(s)->device == dev)
111 nr_disconnect(s, ENETUNREACH);
112 spin_unlock_bh(&nr_list_lock);
113 }
114
115 /*
116 * Handle device status changes.
117 */
118 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
119 {
120 struct net_device *dev = (struct net_device *)ptr;
121
122 if (event != NETDEV_DOWN)
123 return NOTIFY_DONE;
124
125 nr_kill_by_device(dev);
126 nr_rt_device_down(dev);
127
128 return NOTIFY_DONE;
129 }
130
131 /*
132 * Add a socket to the bound sockets list.
133 */
134 static void nr_insert_socket(struct sock *sk)
135 {
136 spin_lock_bh(&nr_list_lock);
137 sk_add_node(sk, &nr_list);
138 spin_unlock_bh(&nr_list_lock);
139 }
140
141 /*
142 * Find a socket that wants to accept the Connect Request we just
143 * received.
144 */
145 static struct sock *nr_find_listener(ax25_address *addr)
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 if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
153 s->sk_state == TCP_LISTEN) {
154 bh_lock_sock(s);
155 goto found;
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 my circuit IDs.
165 */
166 static struct sock *nr_find_socket(unsigned char index, unsigned char id)
167 {
168 struct sock *s;
169 struct hlist_node *node;
170
171 spin_lock_bh(&nr_list_lock);
172 sk_for_each(s, node, &nr_list) {
173 nr_cb *nr = nr_sk(s);
174
175 if (nr->my_index == index && nr->my_id == id) {
176 bh_lock_sock(s);
177 goto found;
178 }
179 }
180 s = NULL;
181 found:
182 spin_unlock_bh(&nr_list_lock);
183 return s;
184 }
185
186 /*
187 * Find a connected NET/ROM socket given their circuit IDs.
188 */
189 static struct sock *nr_find_peer(unsigned char index, unsigned char id,
190 ax25_address *dest)
191 {
192 struct sock *s;
193 struct hlist_node *node;
194
195 spin_lock_bh(&nr_list_lock);
196 sk_for_each(s, node, &nr_list) {
197 nr_cb *nr = nr_sk(s);
198
199 if (nr->your_index == index && nr->your_id == id &&
200 !ax25cmp(&nr->dest_addr, dest)) {
201 bh_lock_sock(s);
202 goto found;
203 }
204 }
205 s = NULL;
206 found:
207 spin_unlock_bh(&nr_list_lock);
208 return s;
209 }
210
211 /*
212 * Find next free circuit ID.
213 */
214 static unsigned short nr_find_next_circuit(void)
215 {
216 unsigned short id = circuit;
217 unsigned char i, j;
218 struct sock *sk;
219
220 for (;;) {
221 i = id / 256;
222 j = id % 256;
223
224 if (i != 0 && j != 0) {
225 if ((sk=nr_find_socket(i, j)) == NULL)
226 break;
227 bh_unlock_sock(sk);
228 }
229
230 id++;
231 }
232
233 return id;
234 }
235
236 /*
237 * Deferred destroy.
238 */
239 void nr_destroy_socket(struct sock *);
240
241 /*
242 * Handler for deferred kills.
243 */
244 static void nr_destroy_timer(unsigned long data)
245 {
246 struct sock *sk=(struct sock *)data;
247 bh_lock_sock(sk);
248 sock_hold(sk);
249 nr_destroy_socket(sk);
250 bh_unlock_sock(sk);
251 sock_put(sk);
252 }
253
254 /*
255 * This is called from user mode and the timers. Thus it protects itself
256 * against interrupt users but doesn't worry about being called during
257 * work. Once it is removed from the queue no interrupt or bottom half
258 * will touch it and we are (fairly 8-) ) safe.
259 */
260 void nr_destroy_socket(struct sock *sk)
261 {
262 struct sk_buff *skb;
263
264 nr_remove_socket(sk);
265
266 nr_stop_heartbeat(sk);
267 nr_stop_t1timer(sk);
268 nr_stop_t2timer(sk);
269 nr_stop_t4timer(sk);
270 nr_stop_idletimer(sk);
271
272 nr_clear_queues(sk); /* Flush the queues */
273
274 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
275 if (skb->sk != sk) { /* A pending connection */
276 /* Queue the unaccepted socket for death */
277 sock_set_flag(skb->sk, SOCK_DEAD);
278 nr_start_heartbeat(skb->sk);
279 nr_sk(skb->sk)->state = NR_STATE_0;
280 }
281
282 kfree_skb(skb);
283 }
284
285 if (atomic_read(&sk->sk_wmem_alloc) ||
286 atomic_read(&sk->sk_rmem_alloc)) {
287 /* Defer: outstanding buffers */
288 sk->sk_timer.function = nr_destroy_timer;
289 sk->sk_timer.expires = jiffies + 2 * HZ;
290 add_timer(&sk->sk_timer);
291 } else
292 sock_put(sk);
293 }
294
295 /*
296 * Handling for system calls applied via the various interfaces to a
297 * NET/ROM socket object.
298 */
299
300 static int nr_setsockopt(struct socket *sock, int level, int optname,
301 char __user *optval, int optlen)
302 {
303 struct sock *sk = sock->sk;
304 nr_cb *nr = nr_sk(sk);
305 int opt;
306
307 if (level != SOL_NETROM)
308 return -ENOPROTOOPT;
309
310 if (optlen < sizeof(int))
311 return -EINVAL;
312
313 if (get_user(opt, (int __user *)optval))
314 return -EFAULT;
315
316 switch (optname) {
317 case NETROM_T1:
318 if (opt < 1)
319 return -EINVAL;
320 nr->t1 = opt * HZ;
321 return 0;
322
323 case NETROM_T2:
324 if (opt < 1)
325 return -EINVAL;
326 nr->t2 = opt * HZ;
327 return 0;
328
329 case NETROM_N2:
330 if (opt < 1 || opt > 31)
331 return -EINVAL;
332 nr->n2 = opt;
333 return 0;
334
335 case NETROM_T4:
336 if (opt < 1)
337 return -EINVAL;
338 nr->t4 = opt * HZ;
339 return 0;
340
341 case NETROM_IDLE:
342 if (opt < 0)
343 return -EINVAL;
344 nr->idle = opt * 60 * HZ;
345 return 0;
346
347 default:
348 return -ENOPROTOOPT;
349 }
350 }
351
352 static int nr_getsockopt(struct socket *sock, int level, int optname,
353 char __user *optval, int __user *optlen)
354 {
355 struct sock *sk = sock->sk;
356 nr_cb *nr = nr_sk(sk);
357 int val = 0;
358 int len;
359
360 if (level != SOL_NETROM)
361 return -ENOPROTOOPT;
362
363 if (get_user(len, optlen))
364 return -EFAULT;
365
366 if (len < 0)
367 return -EINVAL;
368
369 switch (optname) {
370 case NETROM_T1:
371 val = nr->t1 / HZ;
372 break;
373
374 case NETROM_T2:
375 val = nr->t2 / HZ;
376 break;
377
378 case NETROM_N2:
379 val = nr->n2;
380 break;
381
382 case NETROM_T4:
383 val = nr->t4 / HZ;
384 break;
385
386 case NETROM_IDLE:
387 val = nr->idle / (60 * HZ);
388 break;
389
390 default:
391 return -ENOPROTOOPT;
392 }
393
394 len = min_t(unsigned int, len, sizeof(int));
395
396 if (put_user(len, optlen))
397 return -EFAULT;
398
399 return copy_to_user(optval, &val, len) ? -EFAULT : 0;
400 }
401
402 static int nr_listen(struct socket *sock, int backlog)
403 {
404 struct sock *sk = sock->sk;
405
406 lock_sock(sk);
407 if (sk->sk_state != TCP_LISTEN) {
408 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
409 sk->sk_max_ack_backlog = backlog;
410 sk->sk_state = TCP_LISTEN;
411 release_sock(sk);
412 return 0;
413 }
414 release_sock(sk);
415
416 return -EOPNOTSUPP;
417 }
418
419 static int nr_create(struct socket *sock, int protocol)
420 {
421 struct sock *sk;
422 nr_cb *nr;
423
424 if (sock->type != SOCK_SEQPACKET || protocol != 0)
425 return -ESOCKTNOSUPPORT;
426
427 if ((sk = nr_alloc_sock()) == NULL)
428 return -ENOMEM;
429
430 nr = nr_sk(sk);
431
432 sock_init_data(sock, sk);
433 sk_set_owner(sk, THIS_MODULE);
434
435 sock->ops = &nr_proto_ops;
436 sk->sk_protocol = protocol;
437
438 skb_queue_head_init(&nr->ack_queue);
439 skb_queue_head_init(&nr->reseq_queue);
440 skb_queue_head_init(&nr->frag_queue);
441
442 nr_init_timers(sk);
443
444 nr->t1 = sysctl_netrom_transport_timeout;
445 nr->t2 = sysctl_netrom_transport_acknowledge_delay;
446 nr->n2 = sysctl_netrom_transport_maximum_tries;
447 nr->t4 = sysctl_netrom_transport_busy_delay;
448 nr->idle = 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 nr_cb *nr, *onr;
461
462 if (osk->sk_type != SOCK_SEQPACKET)
463 return NULL;
464
465 if ((sk = nr_alloc_sock()) == NULL)
466 return NULL;
467
468 nr = nr_sk(sk);
469
470 sock_init_data(NULL, sk);
471 sk_set_owner(sk, THIS_MODULE);
472
473 sk->sk_type = osk->sk_type;
474 sk->sk_socket = osk->sk_socket;
475 sk->sk_priority = osk->sk_priority;
476 sk->sk_protocol = osk->sk_protocol;
477 sk->sk_rcvbuf = osk->sk_rcvbuf;
478 sk->sk_sndbuf = osk->sk_sndbuf;
479 sk->sk_debug = osk->sk_debug;
480 sk->sk_state = TCP_ESTABLISHED;
481 sk->sk_sleep = osk->sk_sleep;
482 sk->sk_zapped = osk->sk_zapped;
483
484 skb_queue_head_init(&nr->ack_queue);
485 skb_queue_head_init(&nr->reseq_queue);
486 skb_queue_head_init(&nr->frag_queue);
487
488 nr_init_timers(sk);
489
490 onr = nr_sk(osk);
491
492 nr->t1 = onr->t1;
493 nr->t2 = onr->t2;
494 nr->n2 = onr->n2;
495 nr->t4 = onr->t4;
496 nr->idle = onr->idle;
497 nr->window = onr->window;
498
499 nr->device = onr->device;
500 nr->bpqext = onr->bpqext;
501
502 return sk;
503 }
504
505 static int nr_release(struct socket *sock)
506 {
507 struct sock *sk = sock->sk;
508 nr_cb *nr;
509
510 if (sk == NULL) return 0;
511
512 sock_hold(sk);
513 lock_sock(sk);
514 nr = nr_sk(sk);
515
516 switch (nr->state) {
517 case NR_STATE_0:
518 case NR_STATE_1:
519 case NR_STATE_2:
520 nr_disconnect(sk, 0);
521 nr_destroy_socket(sk);
522 break;
523
524 case NR_STATE_3:
525 nr_clear_queues(sk);
526 nr->n2count = 0;
527 nr_write_internal(sk, NR_DISCREQ);
528 nr_start_t1timer(sk);
529 nr_stop_t2timer(sk);
530 nr_stop_t4timer(sk);
531 nr_stop_idletimer(sk);
532 nr->state = NR_STATE_2;
533 sk->sk_state = TCP_CLOSE;
534 sk->sk_shutdown |= SEND_SHUTDOWN;
535 sk->sk_state_change(sk);
536 sock_orphan(sk);
537 sock_set_flag(sk, SOCK_DESTROY);
538 sk->sk_socket = NULL;
539 break;
540
541 default:
542 sk->sk_socket = NULL;
543 break;
544 }
545
546 sock->sk = NULL;
547 release_sock(sk);
548 sock_put(sk);
549
550 return 0;
551 }
552
553 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
554 {
555 struct sock *sk = sock->sk;
556 nr_cb *nr = nr_sk(sk);
557 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
558 struct net_device *dev;
559 ax25_address *user, *source;
560
561 lock_sock(sk);
562 if (!sk->sk_zapped) {
563 release_sock(sk);
564 return -EINVAL;
565 }
566 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
567 release_sock(sk);
568 return -EINVAL;
569 }
570 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
571 release_sock(sk);
572 return -EINVAL;
573 }
574 if (addr->fsa_ax25.sax25_family != AF_NETROM) {
575 release_sock(sk);
576 return -EINVAL;
577 }
578 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
579 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n");
580 release_sock(sk);
581 return -EADDRNOTAVAIL;
582 }
583
584 /*
585 * Only the super user can set an arbitrary user callsign.
586 */
587 if (addr->fsa_ax25.sax25_ndigis == 1) {
588 if (!capable(CAP_NET_BIND_SERVICE)) {
589 dev_put(dev);
590 release_sock(sk);
591 return -EACCES;
592 }
593 nr->user_addr = addr->fsa_digipeater[0];
594 nr->source_addr = addr->fsa_ax25.sax25_call;
595 } else {
596 source = &addr->fsa_ax25.sax25_call;
597
598 if ((user = ax25_findbyuid(current->euid)) == NULL) {
599 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
600 release_sock(sk);
601 dev_put(dev);
602 return -EPERM;
603 }
604 user = source;
605 }
606
607 nr->user_addr = *user;
608 nr->source_addr = *source;
609 }
610
611 nr->device = dev;
612 nr_insert_socket(sk);
613
614 sk->sk_zapped = 0;
615 dev_put(dev);
616 release_sock(sk);
617 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n");
618 return 0;
619 }
620
621 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
622 int addr_len, int flags)
623 {
624 struct sock *sk = sock->sk;
625 nr_cb *nr = nr_sk(sk);
626 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
627 ax25_address *user, *source = NULL;
628 struct net_device *dev;
629
630 lock_sock(sk);
631 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
632 sock->state = SS_CONNECTED;
633 release_sock(sk);
634 return 0; /* Connect completed during a ERESTARTSYS event */
635 }
636
637 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
638 sock->state = SS_UNCONNECTED;
639 release_sock(sk);
640 return -ECONNREFUSED;
641 }
642
643 if (sk->sk_state == TCP_ESTABLISHED) {
644 release_sock(sk);
645 return -EISCONN; /* No reconnect on a seqpacket socket */
646 }
647
648 sk->sk_state = TCP_CLOSE;
649 sock->state = SS_UNCONNECTED;
650
651 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
652 release_sock(sk);
653 return -EINVAL;
654 }
655 if (addr->sax25_family != AF_NETROM) {
656 release_sock(sk);
657 return -EINVAL;
658 }
659 if (sk->sk_zapped) { /* Must bind first - autobinding in this may or may not work */
660 sk->sk_zapped = 0;
661
662 if ((dev = nr_dev_first()) == NULL) {
663 release_sock(sk);
664 return -ENETUNREACH;
665 }
666 source = (ax25_address *)dev->dev_addr;
667
668 if ((user = ax25_findbyuid(current->euid)) == NULL) {
669 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
670 dev_put(dev);
671 release_sock(sk);
672 return -EPERM;
673 }
674 user = source;
675 }
676
677 nr->user_addr = *user;
678 nr->source_addr = *source;
679 nr->device = dev;
680
681 dev_put(dev);
682 nr_insert_socket(sk); /* Finish the bind */
683 }
684
685 nr->dest_addr = addr->sax25_call;
686
687 release_sock(sk);
688 circuit = nr_find_next_circuit();
689 lock_sock(sk);
690
691 nr->my_index = circuit / 256;
692 nr->my_id = circuit % 256;
693
694 circuit++;
695
696 /* Move to connecting socket, start sending Connect Requests */
697 sock->state = SS_CONNECTING;
698 sk->sk_state = TCP_SYN_SENT;
699
700 nr_establish_data_link(sk);
701
702 nr->state = NR_STATE_1;
703
704 nr_start_heartbeat(sk);
705
706 /* Now the loop */
707 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
708 release_sock(sk);
709 return -EINPROGRESS;
710 }
711
712 /*
713 * A Connect Ack with Choke or timeout or failed routing will go to
714 * closed.
715 */
716 if (sk->sk_state == TCP_SYN_SENT) {
717 struct task_struct *tsk = current;
718 DECLARE_WAITQUEUE(wait, tsk);
719
720 add_wait_queue(sk->sk_sleep, &wait);
721 for (;;) {
722 set_current_state(TASK_INTERRUPTIBLE);
723 if (sk->sk_state != TCP_SYN_SENT)
724 break;
725 release_sock(sk);
726 if (!signal_pending(tsk)) {
727 schedule();
728 lock_sock(sk);
729 continue;
730 }
731 current->state = TASK_RUNNING;
732 remove_wait_queue(sk->sk_sleep, &wait);
733 return -ERESTARTSYS;
734 }
735 current->state = TASK_RUNNING;
736 remove_wait_queue(sk->sk_sleep, &wait);
737 }
738
739 if (sk->sk_state != TCP_ESTABLISHED) {
740 sock->state = SS_UNCONNECTED;
741 release_sock(sk);
742 return sock_error(sk); /* Always set at this point */
743 }
744
745 sock->state = SS_CONNECTED;
746 release_sock(sk);
747
748 return 0;
749 }
750
751 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
752 {
753 struct task_struct *tsk = current;
754 DECLARE_WAITQUEUE(wait, tsk);
755 struct sk_buff *skb;
756 struct sock *newsk;
757 struct sock *sk;
758 int err = 0;
759
760 if ((sk = sock->sk) == NULL)
761 return -EINVAL;
762
763 lock_sock(sk);
764 if (sk->sk_type != SOCK_SEQPACKET) {
765 err = -EOPNOTSUPP;
766 goto out;
767 }
768
769 if (sk->sk_state != TCP_LISTEN) {
770 err = -EINVAL;
771 goto out;
772 }
773
774 /*
775 * The write queue this time is holding sockets ready to use
776 * hooked into the SABM we saved
777 */
778 add_wait_queue(sk->sk_sleep, &wait);
779 for (;;) {
780 skb = skb_dequeue(&sk->sk_receive_queue);
781 if (skb)
782 break;
783
784 current->state = TASK_INTERRUPTIBLE;
785 release_sock(sk);
786 if (flags & O_NONBLOCK) {
787 current->state = TASK_RUNNING;
788 remove_wait_queue(sk->sk_sleep, &wait);
789 return -EWOULDBLOCK;
790 }
791 if (!signal_pending(tsk)) {
792 schedule();
793 lock_sock(sk);
794 continue;
795 }
796 current->state = TASK_RUNNING;
797 remove_wait_queue(sk->sk_sleep, &wait);
798 return -ERESTARTSYS;
799 }
800 current->state = TASK_RUNNING;
801 remove_wait_queue(sk->sk_sleep, &wait);
802
803 newsk = skb->sk;
804 newsk->sk_socket = newsock;
805 newsk->sk_sleep = &newsock->wait;
806
807 /* Now attach up the new socket */
808 kfree_skb(skb);
809 sk->sk_ack_backlog--;
810 newsock->sk = newsk;
811
812 out:
813 release_sock(sk);
814 return err;
815 }
816
817 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
818 int *uaddr_len, int peer)
819 {
820 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
821 struct sock *sk = sock->sk;
822 nr_cb *nr = nr_sk(sk);
823
824 lock_sock(sk);
825 if (peer != 0) {
826 if (sk->sk_state != TCP_ESTABLISHED) {
827 release_sock(sk);
828 return -ENOTCONN;
829 }
830 sax->fsa_ax25.sax25_family = AF_NETROM;
831 sax->fsa_ax25.sax25_ndigis = 1;
832 sax->fsa_ax25.sax25_call = nr->user_addr;
833 sax->fsa_digipeater[0] = nr->dest_addr;
834 *uaddr_len = sizeof(struct full_sockaddr_ax25);
835 } else {
836 sax->fsa_ax25.sax25_family = AF_NETROM;
837 sax->fsa_ax25.sax25_ndigis = 0;
838 sax->fsa_ax25.sax25_call = nr->source_addr;
839 *uaddr_len = sizeof(struct sockaddr_ax25);
840 }
841 release_sock(sk);
842
843 return 0;
844 }
845
846 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
847 {
848 struct sock *sk;
849 struct sock *make;
850 nr_cb *nr_make;
851 ax25_address *src, *dest, *user;
852 unsigned short circuit_index, circuit_id;
853 unsigned short peer_circuit_index, peer_circuit_id;
854 unsigned short frametype, flags, window, timeout;
855 int ret;
856
857 skb->sk = NULL; /* Initially we don't know who it's for */
858
859 /*
860 * skb->data points to the netrom frame start
861 */
862
863 src = (ax25_address *)(skb->data + 0);
864 dest = (ax25_address *)(skb->data + 7);
865
866 circuit_index = skb->data[15];
867 circuit_id = skb->data[16];
868 peer_circuit_index = skb->data[17];
869 peer_circuit_id = skb->data[18];
870 frametype = skb->data[19] & 0x0F;
871 flags = skb->data[19] & 0xF0;
872
873 #ifdef CONFIG_INET
874 /*
875 * Check for an incoming IP over NET/ROM frame.
876 */
877 if (frametype == NR_PROTOEXT && circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
878 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
879 skb->h.raw = skb->data;
880
881 return nr_rx_ip(skb, dev);
882 }
883 #endif
884
885 /*
886 * Find an existing socket connection, based on circuit ID, if it's
887 * a Connect Request base it on their circuit ID.
888 *
889 * Circuit ID 0/0 is not valid but it could still be a "reset" for a
890 * circuit that no longer exists at the other end ...
891 */
892
893 sk = NULL;
894
895 if (circuit_index == 0 && circuit_id == 0) {
896 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
897 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
898 } else {
899 if (frametype == NR_CONNREQ)
900 sk = nr_find_peer(circuit_index, circuit_id, src);
901 else
902 sk = nr_find_socket(circuit_index, circuit_id);
903 }
904
905 if (sk != NULL) {
906 skb->h.raw = skb->data;
907
908 if (frametype == NR_CONNACK && skb->len == 22)
909 nr_sk(sk)->bpqext = 1;
910 else
911 nr_sk(sk)->bpqext = 0;
912
913 ret = nr_process_rx_frame(sk, skb);
914 bh_unlock_sock(sk);
915 return ret;
916 }
917
918 /*
919 * Now it should be a CONNREQ.
920 */
921 if (frametype != NR_CONNREQ) {
922 /*
923 * Here it would be nice to be able to send a reset but
924 * NET/ROM doesn't have one. The following hack would
925 * have been a way to extend the protocol but apparently
926 * it kills BPQ boxes... :-(
927 */
928 #if 0
929 /*
930 * Never reply to a CONNACK/CHOKE.
931 */
932 if (frametype != NR_CONNACK || flags != NR_CHOKE_FLAG)
933 nr_transmit_refusal(skb, 1);
934 #endif
935 return 0;
936 }
937
938 sk = nr_find_listener(dest);
939
940 user = (ax25_address *)(skb->data + 21);
941
942 if (!sk || sk->sk_ack_backlog == sk->sk_max_ack_backlog ||
943 (make = nr_make_new(sk)) == NULL) {
944 nr_transmit_refusal(skb, 0);
945 if (sk)
946 bh_unlock_sock(sk);
947 return 0;
948 }
949
950 window = skb->data[20];
951
952 skb->sk = make;
953 make->sk_state = TCP_ESTABLISHED;
954
955 /* Fill in his circuit details */
956 nr_make = nr_sk(make);
957 nr_make->source_addr = *dest;
958 nr_make->dest_addr = *src;
959 nr_make->user_addr = *user;
960
961 nr_make->your_index = circuit_index;
962 nr_make->your_id = circuit_id;
963
964 bh_unlock_sock(sk);
965 circuit = nr_find_next_circuit();
966 bh_lock_sock(sk);
967
968 nr_make->my_index = circuit / 256;
969 nr_make->my_id = circuit % 256;
970
971 circuit++;
972
973 /* Window negotiation */
974 if (window < nr_make->window)
975 nr_make->window = window;
976
977 /* L4 timeout negotiation */
978 if (skb->len == 37) {
979 timeout = skb->data[36] * 256 + skb->data[35];
980 if (timeout * HZ < nr_make->t1)
981 nr_make->t1 = timeout * HZ;
982 nr_make->bpqext = 1;
983 } else {
984 nr_make->bpqext = 0;
985 }
986
987 nr_write_internal(make, NR_CONNACK);
988
989 nr_make->condition = 0x00;
990 nr_make->vs = 0;
991 nr_make->va = 0;
992 nr_make->vr = 0;
993 nr_make->vl = 0;
994 nr_make->state = NR_STATE_3;
995 sk->sk_ack_backlog++;
996
997 nr_insert_socket(make);
998
999 skb_queue_head(&sk->sk_receive_queue, skb);
1000
1001 nr_start_heartbeat(make);
1002 nr_start_idletimer(make);
1003
1004 if (!sock_flag(sk, SOCK_DEAD))
1005 sk->sk_data_ready(sk, skb->len);
1006
1007 bh_unlock_sock(sk);
1008 return 1;
1009 }
1010
1011 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
1012 struct msghdr *msg, size_t len)
1013 {
1014 struct sock *sk = sock->sk;
1015 nr_cb *nr = nr_sk(sk);
1016 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name;
1017 int err;
1018 struct sockaddr_ax25 sax;
1019 struct sk_buff *skb;
1020 unsigned char *asmptr;
1021 int size;
1022
1023 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1024 return -EINVAL;
1025
1026 lock_sock(sk);
1027 if (sk->sk_zapped) {
1028 err = -EADDRNOTAVAIL;
1029 goto out;
1030 }
1031
1032 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1033 send_sig(SIGPIPE, current, 0);
1034 err = -EPIPE;
1035 goto out;
1036 }
1037
1038 if (nr->device == NULL) {
1039 err = -ENETUNREACH;
1040 goto out;
1041 }
1042
1043 if (usax) {
1044 if (msg->msg_namelen < sizeof(sax)) {
1045 err = -EINVAL;
1046 goto out;
1047 }
1048 sax = *usax;
1049 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1050 err = -EISCONN;
1051 goto out;
1052 }
1053 if (sax.sax25_family != AF_NETROM) {
1054 err = -EINVAL;
1055 goto out;
1056 }
1057 } else {
1058 if (sk->sk_state != TCP_ESTABLISHED) {
1059 err = -ENOTCONN;
1060 goto out;
1061 }
1062 sax.sax25_family = AF_NETROM;
1063 sax.sax25_call = nr->dest_addr;
1064 }
1065
1066 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n");
1067
1068 /* Build a packet */
1069 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
1070 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1071
1072 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1073 goto out;
1074
1075 skb_reserve(skb, size - len);
1076
1077 /*
1078 * Push down the NET/ROM header
1079 */
1080
1081 asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1082 SOCK_DEBUG(sk, "Building NET/ROM Header.\n");
1083
1084 /* Build a NET/ROM Transport header */
1085
1086 *asmptr++ = nr->your_index;
1087 *asmptr++ = nr->your_id;
1088 *asmptr++ = 0; /* To be filled in later */
1089 *asmptr++ = 0; /* Ditto */
1090 *asmptr++ = NR_INFO;
1091 SOCK_DEBUG(sk, "Built header.\n");
1092
1093 /*
1094 * Put the data on the end
1095 */
1096
1097 skb->h.raw = skb_put(skb, len);
1098
1099 asmptr = skb->h.raw;
1100 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n");
1101
1102 /* User data follows immediately after the NET/ROM transport header */
1103 if (memcpy_fromiovec(asmptr, msg->msg_iov, len)) {
1104 kfree_skb(skb);
1105 err = -EFAULT;
1106 goto out;
1107 }
1108
1109 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n");
1110
1111 if (sk->sk_state != TCP_ESTABLISHED) {
1112 kfree_skb(skb);
1113 err = -ENOTCONN;
1114 goto out;
1115 }
1116
1117 nr_output(sk, skb); /* Shove it onto the queue */
1118
1119 err = len;
1120 out:
1121 release_sock(sk);
1122 return err;
1123 }
1124
1125 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
1126 struct msghdr *msg, size_t size, int flags)
1127 {
1128 struct sock *sk = sock->sk;
1129 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name;
1130 size_t copied;
1131 struct sk_buff *skb;
1132 int er;
1133
1134 /*
1135 * This works for seqpacket too. The receiver has ordered the queue for
1136 * us! We do one quick check first though
1137 */
1138
1139 lock_sock(sk);
1140 if (sk->sk_state != TCP_ESTABLISHED) {
1141 release_sock(sk);
1142 return -ENOTCONN;
1143 }
1144
1145 /* Now we can treat all alike */
1146 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1147 release_sock(sk);
1148 return er;
1149 }
1150
1151 skb->h.raw = skb->data;
1152 copied = skb->len;
1153
1154 if (copied > size) {
1155 copied = size;
1156 msg->msg_flags |= MSG_TRUNC;
1157 }
1158
1159 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1160
1161 if (sax != NULL) {
1162 sax->sax25_family = AF_NETROM;
1163 memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN);
1164 }
1165
1166 msg->msg_namelen = sizeof(*sax);
1167
1168 skb_free_datagram(sk, skb);
1169
1170 release_sock(sk);
1171 return copied;
1172 }
1173
1174
1175 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1176 {
1177 struct sock *sk = sock->sk;
1178 void __user *argp = (void __user *)arg;
1179 int ret;
1180
1181 lock_sock(sk);
1182 switch (cmd) {
1183 case TIOCOUTQ: {
1184 long amount;
1185 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1186 if (amount < 0)
1187 amount = 0;
1188 release_sock(sk);
1189 return put_user(amount, (int __user *)argp);
1190 }
1191
1192 case TIOCINQ: {
1193 struct sk_buff *skb;
1194 long amount = 0L;
1195 /* These two are safe on a single CPU system as only user tasks fiddle here */
1196 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1197 amount = skb->len;
1198 release_sock(sk);
1199 return put_user(amount, (int __user *)argp);
1200 }
1201
1202 case SIOCGSTAMP:
1203 ret = -EINVAL;
1204 if (sk != NULL)
1205 ret = sock_get_timestamp(sk, argp);
1206 release_sock(sk);
1207 return ret;
1208
1209 case SIOCGIFADDR:
1210 case SIOCSIFADDR:
1211 case SIOCGIFDSTADDR:
1212 case SIOCSIFDSTADDR:
1213 case SIOCGIFBRDADDR:
1214 case SIOCSIFBRDADDR:
1215 case SIOCGIFNETMASK:
1216 case SIOCSIFNETMASK:
1217 case SIOCGIFMETRIC:
1218 case SIOCSIFMETRIC:
1219 release_sock(sk);
1220 return -EINVAL;
1221
1222 case SIOCADDRT:
1223 case SIOCDELRT:
1224 case SIOCNRDECOBS:
1225 release_sock(sk);
1226 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1227 return nr_rt_ioctl(cmd, argp);
1228
1229 default:
1230 release_sock(sk);
1231 return dev_ioctl(cmd, argp);
1232 }
1233 release_sock(sk);
1234
1235 return 0;
1236 }
1237
1238 #ifdef CONFIG_PROC_FS
1239
1240 static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1241 {
1242 struct sock *s;
1243 struct hlist_node *node;
1244 int i = 1;
1245
1246 spin_lock_bh(&nr_list_lock);
1247 if (*pos == 0)
1248 return SEQ_START_TOKEN;
1249
1250 sk_for_each(s, node, &nr_list) {
1251 if (i == *pos)
1252 return s;
1253 ++i;
1254 }
1255 return NULL;
1256 }
1257
1258 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1259 {
1260 ++*pos;
1261
1262 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list)
1263 : sk_next((struct sock *)v);
1264 }
1265
1266 static void nr_info_stop(struct seq_file *seq, void *v)
1267 {
1268 spin_unlock_bh(&nr_list_lock);
1269 }
1270
1271 static int nr_info_show(struct seq_file *seq, void *v)
1272 {
1273 struct sock *s = v;
1274 struct net_device *dev;
1275 nr_cb *nr;
1276 const char *devname;
1277
1278 if (v == SEQ_START_TOKEN)
1279 seq_puts(seq,
1280 "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");
1281
1282 else {
1283
1284 bh_lock_sock(s);
1285 nr = nr_sk(s);
1286
1287 if ((dev = nr->device) == NULL)
1288 devname = "???";
1289 else
1290 devname = dev->name;
1291
1292 seq_printf(seq, "%-9s ", ax2asc(&nr->user_addr));
1293 seq_printf(seq, "%-9s ", ax2asc(&nr->dest_addr));
1294 seq_printf(seq,
1295 "%-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",
1296 ax2asc(&nr->source_addr),
1297 devname,
1298 nr->my_index,
1299 nr->my_id,
1300 nr->your_index,
1301 nr->your_id,
1302 nr->state,
1303 nr->vs,
1304 nr->vr,
1305 nr->va,
1306 ax25_display_timer(&nr->t1timer) / HZ,
1307 nr->t1 / HZ,
1308 ax25_display_timer(&nr->t2timer) / HZ,
1309 nr->t2 / HZ,
1310 ax25_display_timer(&nr->t4timer) / HZ,
1311 nr->t4 / HZ,
1312 ax25_display_timer(&nr->idletimer) / (60 * HZ),
1313 nr->idle / (60 * HZ),
1314 nr->n2count,
1315 nr->n2,
1316 nr->window,
1317 atomic_read(&s->sk_wmem_alloc),
1318 atomic_read(&s->sk_rmem_alloc),
1319 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1320
1321 bh_unlock_sock(s);
1322 }
1323 return 0;
1324 }
1325
1326 static struct seq_operations nr_info_seqops = {
1327 .start = nr_info_start,
1328 .next = nr_info_next,
1329 .stop = nr_info_stop,
1330 .show = nr_info_show,
1331 };
1332
1333 static int nr_info_open(struct inode *inode, struct file *file)
1334 {
1335 return seq_open(file, &nr_info_seqops);
1336 }
1337
1338 static struct file_operations nr_info_fops = {
1339 .owner = THIS_MODULE,
1340 .open = nr_info_open,
1341 .read = seq_read,
1342 .llseek = seq_lseek,
1343 .release = seq_release,
1344 };
1345 #endif /* CONFIG_PROC_FS */
1346
1347 static struct net_proto_family nr_family_ops = {
1348 .family = PF_NETROM,
1349 .create = nr_create,
1350 .owner = THIS_MODULE,
1351 };
1352
1353 static struct proto_ops nr_proto_ops = {
1354 .family = PF_NETROM,
1355 .owner = THIS_MODULE,
1356 .release = nr_release,
1357 .bind = nr_bind,
1358 .connect = nr_connect,
1359 .socketpair = sock_no_socketpair,
1360 .accept = nr_accept,
1361 .getname = nr_getname,
1362 .poll = datagram_poll,
1363 .ioctl = nr_ioctl,
1364 .listen = nr_listen,
1365 .shutdown = sock_no_shutdown,
1366 .setsockopt = nr_setsockopt,
1367 .getsockopt = nr_getsockopt,
1368 .sendmsg = nr_sendmsg,
1369 .recvmsg = nr_recvmsg,
1370 .mmap = sock_no_mmap,
1371 .sendpage = sock_no_sendpage,
1372 };
1373
1374 static struct notifier_block nr_dev_notifier = {
1375 .notifier_call = nr_device_event,
1376 };
1377
1378 static struct net_device **dev_nr;
1379
1380 static char banner[] __initdata = KERN_INFO "G4KLX NET/ROM for Linux. Version 0.7 for AX25.037 Linux 2.4\n";
1381
1382 static int __init nr_proto_init(void)
1383 {
1384 int i;
1385
1386 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1387 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n");
1388 return -1;
1389 }
1390
1391 dev_nr = kmalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL);
1392 if (dev_nr == NULL) {
1393 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n");
1394 return -1;
1395 }
1396
1397 memset(dev_nr, 0x00, nr_ndevs * sizeof(struct net_device *));
1398
1399 for (i = 0; i < nr_ndevs; i++) {
1400 char name[IFNAMSIZ];
1401 struct net_device *dev;
1402
1403 sprintf(name, "nr%d", i);
1404 dev = alloc_netdev(sizeof(struct net_device_stats), name,
1405 nr_setup);
1406 if (!dev) {
1407 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
1408 goto fail;
1409 }
1410
1411 dev->base_addr = i;
1412 if (register_netdev(dev)) {
1413 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n");
1414 free_netdev(dev);
1415 goto fail;
1416 }
1417 dev_nr[i] = dev;
1418 }
1419
1420 if (sock_register(&nr_family_ops)) {
1421 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n");
1422 goto fail;
1423 }
1424
1425 register_netdevice_notifier(&nr_dev_notifier);
1426 printk(banner);
1427
1428 ax25_protocol_register(AX25_P_NETROM, nr_route_frame);
1429 ax25_linkfail_register(nr_link_failed);
1430
1431 #ifdef CONFIG_SYSCTL
1432 nr_register_sysctl();
1433 #endif
1434
1435 nr_loopback_init();
1436
1437 proc_net_fops_create("nr", S_IRUGO, &nr_info_fops);
1438 proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops);
1439 proc_net_fops_create("nr_nodes", S_IRUGO, &nr_nodes_fops);
1440 return 0;
1441
1442 fail:
1443 while (--i >= 0) {
1444 unregister_netdev(dev_nr[i]);
1445 free_netdev(dev_nr[i]);
1446 }
1447 kfree(dev_nr);
1448 return -1;
1449 }
1450
1451 module_init(nr_proto_init);
1452
1453 module_param(nr_ndevs, int, 0);
1454 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1455
1456 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1457 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1458 MODULE_LICENSE("GPL");
1459 MODULE_ALIAS_NETPROTO(PF_NETROM);
1460
1461 static void __exit nr_exit(void)
1462 {
1463 int i;
1464
1465 proc_net_remove("nr");
1466 proc_net_remove("nr_neigh");
1467 proc_net_remove("nr_nodes");
1468 nr_loopback_clear();
1469
1470 nr_rt_free();
1471
1472 #ifdef CONFIG_SYSCTL
1473 nr_unregister_sysctl();
1474 #endif
1475
1476 ax25_linkfail_release(nr_link_failed);
1477 ax25_protocol_release(AX25_P_NETROM);
1478
1479 unregister_netdevice_notifier(&nr_dev_notifier);
1480
1481 sock_unregister(PF_NETROM);
1482
1483 for (i = 0; i < nr_ndevs; i++) {
1484 struct net_device *dev = dev_nr[i];
1485 if (dev) {
1486 unregister_netdev(dev);
1487 free_netdev(dev);
1488 }
1489 }
1490
1491 kfree(dev_nr);
1492 }
1493 module_exit(nr_exit);
1494
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