xref: /openbmc/linux/net/x25/af_x25.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /*
2  *	X.25 Packet Layer release 002
3  *
4  *	This is ALPHA test software. This code may break your machine,
5  *	randomly fail to work with new releases, misbehave and/or generally
6  *	screw up. It might even work.
7  *
8  *	This code REQUIRES 2.1.15 or higher
9  *
10  *	This module:
11  *		This module is free software; you can redistribute it and/or
12  *		modify it under the terms of the GNU General Public License
13  *		as published by the Free Software Foundation; either version
14  *		2 of the License, or (at your option) any later version.
15  *
16  *	History
17  *	X.25 001	Jonathan Naylor	Started coding.
18  *	X.25 002	Jonathan Naylor	Centralised disconnect handling.
19  *					New timer architecture.
20  *	2000-03-11	Henner Eisen	MSG_EOR handling more POSIX compliant.
21  *	2000-03-22	Daniela Squassoni Allowed disabling/enabling of
22  *					  facilities negotiation and increased
23  *					  the throughput upper limit.
24  *	2000-08-27	Arnaldo C. Melo s/suser/capable/ + micro cleanups
25  *	2000-09-04	Henner Eisen	Set sock->state in x25_accept().
26  *					Fixed x25_output() related skb leakage.
27  *	2000-10-02	Henner Eisen	Made x25_kick() single threaded per socket.
28  *	2000-10-27	Henner Eisen    MSG_DONTWAIT for fragment allocation.
29  *	2000-11-14	Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
30  *	2002-10-06	Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31  *					x25_proc.c, using seq_file
32  *	2005-04-02	Shaun Pereira	Selective sub address matching
33  *					with call user data
34  *	2005-04-15	Shaun Pereira	Fast select with no restriction on
35  *					response
36  */
37 
38 #include <linux/config.h>
39 #include <linux/module.h>
40 #include <linux/errno.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/timer.h>
44 #include <linux/string.h>
45 #include <linux/net.h>
46 #include <linux/netdevice.h>
47 #include <linux/if_arp.h>
48 #include <linux/skbuff.h>
49 #include <net/sock.h>
50 #include <net/tcp_states.h>
51 #include <asm/uaccess.h>
52 #include <linux/fcntl.h>
53 #include <linux/termios.h>	/* For TIOCINQ/OUTQ */
54 #include <linux/notifier.h>
55 #include <linux/init.h>
56 #include <net/x25.h>
57 
58 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
59 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
60 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
61 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
62 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
63 
64 HLIST_HEAD(x25_list);
65 DEFINE_RWLOCK(x25_list_lock);
66 
67 static struct proto_ops x25_proto_ops;
68 
69 static struct x25_address null_x25_address = {"               "};
70 
71 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
72 		  struct x25_address *calling_addr)
73 {
74 	int called_len, calling_len;
75 	char *called, *calling;
76 	int i;
77 
78 	called_len  = (*p >> 0) & 0x0F;
79 	calling_len = (*p >> 4) & 0x0F;
80 
81 	called  = called_addr->x25_addr;
82 	calling = calling_addr->x25_addr;
83 	p++;
84 
85 	for (i = 0; i < (called_len + calling_len); i++) {
86 		if (i < called_len) {
87 			if (i % 2 != 0) {
88 				*called++ = ((*p >> 0) & 0x0F) + '0';
89 				p++;
90 			} else {
91 				*called++ = ((*p >> 4) & 0x0F) + '0';
92 			}
93 		} else {
94 			if (i % 2 != 0) {
95 				*calling++ = ((*p >> 0) & 0x0F) + '0';
96 				p++;
97 			} else {
98 				*calling++ = ((*p >> 4) & 0x0F) + '0';
99 			}
100 		}
101 	}
102 
103 	*called = *calling = '\0';
104 
105 	return 1 + (called_len + calling_len + 1) / 2;
106 }
107 
108 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
109 		  struct x25_address *calling_addr)
110 {
111 	unsigned int called_len, calling_len;
112 	char *called, *calling;
113 	int i;
114 
115 	called  = called_addr->x25_addr;
116 	calling = calling_addr->x25_addr;
117 
118 	called_len  = strlen(called);
119 	calling_len = strlen(calling);
120 
121 	*p++ = (calling_len << 4) | (called_len << 0);
122 
123 	for (i = 0; i < (called_len + calling_len); i++) {
124 		if (i < called_len) {
125 			if (i % 2 != 0) {
126 				*p |= (*called++ - '0') << 0;
127 				p++;
128 			} else {
129 				*p = 0x00;
130 				*p |= (*called++ - '0') << 4;
131 			}
132 		} else {
133 			if (i % 2 != 0) {
134 				*p |= (*calling++ - '0') << 0;
135 				p++;
136 			} else {
137 				*p = 0x00;
138 				*p |= (*calling++ - '0') << 4;
139 			}
140 		}
141 	}
142 
143 	return 1 + (called_len + calling_len + 1) / 2;
144 }
145 
146 /*
147  *	Socket removal during an interrupt is now safe.
148  */
149 static void x25_remove_socket(struct sock *sk)
150 {
151 	write_lock_bh(&x25_list_lock);
152 	sk_del_node_init(sk);
153 	write_unlock_bh(&x25_list_lock);
154 }
155 
156 /*
157  *	Kill all bound sockets on a dropped device.
158  */
159 static void x25_kill_by_device(struct net_device *dev)
160 {
161 	struct sock *s;
162 	struct hlist_node *node;
163 
164 	write_lock_bh(&x25_list_lock);
165 
166 	sk_for_each(s, node, &x25_list)
167 		if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
168 			x25_disconnect(s, ENETUNREACH, 0, 0);
169 
170 	write_unlock_bh(&x25_list_lock);
171 }
172 
173 /*
174  *	Handle device status changes.
175  */
176 static int x25_device_event(struct notifier_block *this, unsigned long event,
177 			    void *ptr)
178 {
179 	struct net_device *dev = ptr;
180 	struct x25_neigh *nb;
181 
182 	if (dev->type == ARPHRD_X25
183 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
184 	 || dev->type == ARPHRD_ETHER
185 #endif
186 	 ) {
187 		switch (event) {
188 			case NETDEV_UP:
189 				x25_link_device_up(dev);
190 				break;
191 			case NETDEV_GOING_DOWN:
192 				nb = x25_get_neigh(dev);
193 				if (nb) {
194 					x25_terminate_link(nb);
195 					x25_neigh_put(nb);
196 				}
197 				break;
198 			case NETDEV_DOWN:
199 				x25_kill_by_device(dev);
200 				x25_route_device_down(dev);
201 				x25_link_device_down(dev);
202 				break;
203 		}
204 	}
205 
206 	return NOTIFY_DONE;
207 }
208 
209 /*
210  *	Add a socket to the bound sockets list.
211  */
212 static void x25_insert_socket(struct sock *sk)
213 {
214 	write_lock_bh(&x25_list_lock);
215 	sk_add_node(sk, &x25_list);
216 	write_unlock_bh(&x25_list_lock);
217 }
218 
219 /*
220  *	Find a socket that wants to accept the Call Request we just
221  *	received. Check the full list for an address/cud match.
222  *	If no cuds match return the next_best thing, an address match.
223  *	Note: if a listening socket has cud set it must only get calls
224  *	with matching cud.
225  */
226 static struct sock *x25_find_listener(struct x25_address *addr,
227 					struct sk_buff *skb)
228 {
229 	struct sock *s;
230 	struct sock *next_best;
231 	struct hlist_node *node;
232 
233 	read_lock_bh(&x25_list_lock);
234 	next_best = NULL;
235 
236 	sk_for_each(s, node, &x25_list)
237 		if ((!strcmp(addr->x25_addr,
238 			x25_sk(s)->source_addr.x25_addr) ||
239 				!strcmp(addr->x25_addr,
240 					null_x25_address.x25_addr)) &&
241 					s->sk_state == TCP_LISTEN) {
242 			/*
243 			 * Found a listening socket, now check the incoming
244 			 * call user data vs this sockets call user data
245 			 */
246 			if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
247 			 	if((memcmp(x25_sk(s)->calluserdata.cuddata,
248 			 		skb->data,
249 					x25_sk(s)->cudmatchlength)) == 0) {
250 					sock_hold(s);
251 					goto found;
252 				 }
253 			} else
254 				next_best = s;
255 		}
256 	if (next_best) {
257 		s = next_best;
258 		sock_hold(s);
259 		goto found;
260 	}
261 	s = NULL;
262 found:
263 	read_unlock_bh(&x25_list_lock);
264 	return s;
265 }
266 
267 /*
268  *	Find a connected X.25 socket given my LCI and neighbour.
269  */
270 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
271 {
272 	struct sock *s;
273 	struct hlist_node *node;
274 
275 	sk_for_each(s, node, &x25_list)
276 		if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
277 			sock_hold(s);
278 			goto found;
279 		}
280 	s = NULL;
281 found:
282 	return s;
283 }
284 
285 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
286 {
287 	struct sock *s;
288 
289 	read_lock_bh(&x25_list_lock);
290 	s = __x25_find_socket(lci, nb);
291 	read_unlock_bh(&x25_list_lock);
292 	return s;
293 }
294 
295 /*
296  *	Find a unique LCI for a given device.
297  */
298 static unsigned int x25_new_lci(struct x25_neigh *nb)
299 {
300 	unsigned int lci = 1;
301 	struct sock *sk;
302 
303 	read_lock_bh(&x25_list_lock);
304 
305 	while ((sk = __x25_find_socket(lci, nb)) != NULL) {
306 		sock_put(sk);
307 		if (++lci == 4096) {
308 			lci = 0;
309 			break;
310 		}
311 	}
312 
313 	read_unlock_bh(&x25_list_lock);
314 	return lci;
315 }
316 
317 /*
318  *	Deferred destroy.
319  */
320 void x25_destroy_socket(struct sock *);
321 
322 /*
323  *	handler for deferred kills.
324  */
325 static void x25_destroy_timer(unsigned long data)
326 {
327 	x25_destroy_socket((struct sock *)data);
328 }
329 
330 /*
331  *	This is called from user mode and the timers. Thus it protects itself
332  *	against interrupt users but doesn't worry about being called during
333  *	work. Once it is removed from the queue no interrupt or bottom half
334  *	will touch it and we are (fairly 8-) ) safe.
335  *	Not static as it's used by the timer
336  */
337 void x25_destroy_socket(struct sock *sk)
338 {
339 	struct sk_buff *skb;
340 
341 	sock_hold(sk);
342 	lock_sock(sk);
343 	x25_stop_heartbeat(sk);
344 	x25_stop_timer(sk);
345 
346 	x25_remove_socket(sk);
347 	x25_clear_queues(sk);		/* Flush the queues */
348 
349 	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
350 		if (skb->sk != sk) {		/* A pending connection */
351 			/*
352 			 * Queue the unaccepted socket for death
353 			 */
354 			sock_set_flag(skb->sk, SOCK_DEAD);
355 			x25_start_heartbeat(skb->sk);
356 			x25_sk(skb->sk)->state = X25_STATE_0;
357 		}
358 
359 		kfree_skb(skb);
360 	}
361 
362 	if (atomic_read(&sk->sk_wmem_alloc) ||
363 	    atomic_read(&sk->sk_rmem_alloc)) {
364 		/* Defer: outstanding buffers */
365 		sk->sk_timer.expires  = jiffies + 10 * HZ;
366 		sk->sk_timer.function = x25_destroy_timer;
367 		sk->sk_timer.data = (unsigned long)sk;
368 		add_timer(&sk->sk_timer);
369 	} else {
370 		/* drop last reference so sock_put will free */
371 		__sock_put(sk);
372 	}
373 
374 	release_sock(sk);
375 	sock_put(sk);
376 }
377 
378 /*
379  *	Handling for system calls applied via the various interfaces to a
380  *	X.25 socket object.
381  */
382 
383 static int x25_setsockopt(struct socket *sock, int level, int optname,
384 			  char __user *optval, int optlen)
385 {
386 	int opt;
387 	struct sock *sk = sock->sk;
388 	int rc = -ENOPROTOOPT;
389 
390 	if (level != SOL_X25 || optname != X25_QBITINCL)
391 		goto out;
392 
393 	rc = -EINVAL;
394 	if (optlen < sizeof(int))
395 		goto out;
396 
397 	rc = -EFAULT;
398 	if (get_user(opt, (int __user *)optval))
399 		goto out;
400 
401 	x25_sk(sk)->qbitincl = !!opt;
402 	rc = 0;
403 out:
404 	return rc;
405 }
406 
407 static int x25_getsockopt(struct socket *sock, int level, int optname,
408 			  char __user *optval, int __user *optlen)
409 {
410 	struct sock *sk = sock->sk;
411 	int val, len, rc = -ENOPROTOOPT;
412 
413 	if (level != SOL_X25 || optname != X25_QBITINCL)
414 		goto out;
415 
416 	rc = -EFAULT;
417 	if (get_user(len, optlen))
418 		goto out;
419 
420 	len = min_t(unsigned int, len, sizeof(int));
421 
422 	rc = -EINVAL;
423 	if (len < 0)
424 		goto out;
425 
426 	rc = -EFAULT;
427 	if (put_user(len, optlen))
428 		goto out;
429 
430 	val = x25_sk(sk)->qbitincl;
431 	rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
432 out:
433 	return rc;
434 }
435 
436 static int x25_listen(struct socket *sock, int backlog)
437 {
438 	struct sock *sk = sock->sk;
439 	int rc = -EOPNOTSUPP;
440 
441 	if (sk->sk_state != TCP_LISTEN) {
442 		memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
443 		sk->sk_max_ack_backlog = backlog;
444 		sk->sk_state           = TCP_LISTEN;
445 		rc = 0;
446 	}
447 
448 	return rc;
449 }
450 
451 static struct proto x25_proto = {
452 	.name	  = "X25",
453 	.owner	  = THIS_MODULE,
454 	.obj_size = sizeof(struct x25_sock),
455 };
456 
457 static struct sock *x25_alloc_socket(void)
458 {
459 	struct x25_sock *x25;
460 	struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
461 
462 	if (!sk)
463 		goto out;
464 
465 	sock_init_data(NULL, sk);
466 
467 	x25 = x25_sk(sk);
468 	skb_queue_head_init(&x25->ack_queue);
469 	skb_queue_head_init(&x25->fragment_queue);
470 	skb_queue_head_init(&x25->interrupt_in_queue);
471 	skb_queue_head_init(&x25->interrupt_out_queue);
472 out:
473 	return sk;
474 }
475 
476 void x25_init_timers(struct sock *sk);
477 
478 static int x25_create(struct socket *sock, int protocol)
479 {
480 	struct sock *sk;
481 	struct x25_sock *x25;
482 	int rc = -ESOCKTNOSUPPORT;
483 
484 	if (sock->type != SOCK_SEQPACKET || protocol)
485 		goto out;
486 
487 	rc = -ENOMEM;
488 	if ((sk = x25_alloc_socket()) == NULL)
489 		goto out;
490 
491 	x25 = x25_sk(sk);
492 
493 	sock_init_data(sock, sk);
494 
495 	x25_init_timers(sk);
496 
497 	sock->ops    = &x25_proto_ops;
498 	sk->sk_protocol = protocol;
499 	sk->sk_backlog_rcv = x25_backlog_rcv;
500 
501 	x25->t21   = sysctl_x25_call_request_timeout;
502 	x25->t22   = sysctl_x25_reset_request_timeout;
503 	x25->t23   = sysctl_x25_clear_request_timeout;
504 	x25->t2    = sysctl_x25_ack_holdback_timeout;
505 	x25->state = X25_STATE_0;
506 	x25->cudmatchlength = 0;
507 	x25->accptapprv = X25_DENY_ACCPT_APPRV;		/* normally no cud  */
508 							/* on call accept   */
509 
510 	x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
511 	x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
512 	x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
513 	x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
514 	x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
515 	x25->facilities.reverse     = X25_DEFAULT_REVERSE;
516 	rc = 0;
517 out:
518 	return rc;
519 }
520 
521 static struct sock *x25_make_new(struct sock *osk)
522 {
523 	struct sock *sk = NULL;
524 	struct x25_sock *x25, *ox25;
525 
526 	if (osk->sk_type != SOCK_SEQPACKET)
527 		goto out;
528 
529 	if ((sk = x25_alloc_socket()) == NULL)
530 		goto out;
531 
532 	x25 = x25_sk(sk);
533 
534 	sk->sk_type        = osk->sk_type;
535 	sk->sk_socket      = osk->sk_socket;
536 	sk->sk_priority    = osk->sk_priority;
537 	sk->sk_protocol    = osk->sk_protocol;
538 	sk->sk_rcvbuf      = osk->sk_rcvbuf;
539 	sk->sk_sndbuf      = osk->sk_sndbuf;
540 	sk->sk_state       = TCP_ESTABLISHED;
541 	sk->sk_sleep       = osk->sk_sleep;
542 	sk->sk_backlog_rcv = osk->sk_backlog_rcv;
543 
544 	if (sock_flag(osk, SOCK_ZAPPED))
545 		sock_set_flag(sk, SOCK_ZAPPED);
546 
547 	if (sock_flag(osk, SOCK_DBG))
548 		sock_set_flag(sk, SOCK_DBG);
549 
550 	ox25 = x25_sk(osk);
551 	x25->t21        = ox25->t21;
552 	x25->t22        = ox25->t22;
553 	x25->t23        = ox25->t23;
554 	x25->t2         = ox25->t2;
555 	x25->facilities = ox25->facilities;
556 	x25->qbitincl   = ox25->qbitincl;
557 	x25->cudmatchlength = ox25->cudmatchlength;
558 	x25->accptapprv = ox25->accptapprv;
559 
560 	x25_init_timers(sk);
561 out:
562 	return sk;
563 }
564 
565 static int x25_release(struct socket *sock)
566 {
567 	struct sock *sk = sock->sk;
568 	struct x25_sock *x25;
569 
570 	if (!sk)
571 		goto out;
572 
573 	x25 = x25_sk(sk);
574 
575 	switch (x25->state) {
576 
577 		case X25_STATE_0:
578 		case X25_STATE_2:
579 			x25_disconnect(sk, 0, 0, 0);
580 			x25_destroy_socket(sk);
581 			goto out;
582 
583 		case X25_STATE_1:
584 		case X25_STATE_3:
585 		case X25_STATE_4:
586 			x25_clear_queues(sk);
587 			x25_write_internal(sk, X25_CLEAR_REQUEST);
588 			x25_start_t23timer(sk);
589 			x25->state = X25_STATE_2;
590 			sk->sk_state	= TCP_CLOSE;
591 			sk->sk_shutdown	|= SEND_SHUTDOWN;
592 			sk->sk_state_change(sk);
593 			sock_set_flag(sk, SOCK_DEAD);
594 			sock_set_flag(sk, SOCK_DESTROY);
595 			break;
596 	}
597 
598 	sock->sk	= NULL;
599 	sk->sk_socket	= NULL;	/* Not used, but we should do this */
600 out:
601 	return 0;
602 }
603 
604 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
605 {
606 	struct sock *sk = sock->sk;
607 	struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
608 
609 	if (!sock_flag(sk, SOCK_ZAPPED) ||
610 	    addr_len != sizeof(struct sockaddr_x25) ||
611 	    addr->sx25_family != AF_X25)
612 		return -EINVAL;
613 
614 	x25_sk(sk)->source_addr = addr->sx25_addr;
615 	x25_insert_socket(sk);
616 	sock_reset_flag(sk, SOCK_ZAPPED);
617 	SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
618 
619 	return 0;
620 }
621 
622 static int x25_wait_for_connection_establishment(struct sock *sk)
623 {
624 	DECLARE_WAITQUEUE(wait, current);
625         int rc;
626 
627 	add_wait_queue_exclusive(sk->sk_sleep, &wait);
628 	for (;;) {
629 		__set_current_state(TASK_INTERRUPTIBLE);
630 		rc = -ERESTARTSYS;
631 		if (signal_pending(current))
632 			break;
633 		rc = sock_error(sk);
634 		if (rc) {
635 			sk->sk_socket->state = SS_UNCONNECTED;
636 			break;
637 		}
638 		rc = 0;
639 		if (sk->sk_state != TCP_ESTABLISHED) {
640 			release_sock(sk);
641 			schedule();
642 			lock_sock(sk);
643 		} else
644 			break;
645 	}
646 	__set_current_state(TASK_RUNNING);
647 	remove_wait_queue(sk->sk_sleep, &wait);
648 	return rc;
649 }
650 
651 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
652 		       int addr_len, int flags)
653 {
654 	struct sock *sk = sock->sk;
655 	struct x25_sock *x25 = x25_sk(sk);
656 	struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
657 	struct x25_route *rt;
658 	int rc = 0;
659 
660 	lock_sock(sk);
661 	if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
662 		sock->state = SS_CONNECTED;
663 		goto out; /* Connect completed during a ERESTARTSYS event */
664 	}
665 
666 	rc = -ECONNREFUSED;
667 	if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
668 		sock->state = SS_UNCONNECTED;
669 		goto out;
670 	}
671 
672 	rc = -EISCONN;	/* No reconnect on a seqpacket socket */
673 	if (sk->sk_state == TCP_ESTABLISHED)
674 		goto out;
675 
676 	sk->sk_state   = TCP_CLOSE;
677 	sock->state = SS_UNCONNECTED;
678 
679 	rc = -EINVAL;
680 	if (addr_len != sizeof(struct sockaddr_x25) ||
681 	    addr->sx25_family != AF_X25)
682 		goto out;
683 
684 	rc = -ENETUNREACH;
685 	rt = x25_get_route(&addr->sx25_addr);
686 	if (!rt)
687 		goto out;
688 
689 	x25->neighbour = x25_get_neigh(rt->dev);
690 	if (!x25->neighbour)
691 		goto out_put_route;
692 
693 	x25_limit_facilities(&x25->facilities, x25->neighbour);
694 
695 	x25->lci = x25_new_lci(x25->neighbour);
696 	if (!x25->lci)
697 		goto out_put_neigh;
698 
699 	rc = -EINVAL;
700 	if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
701 		goto out_put_neigh;
702 
703 	if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
704 		memset(&x25->source_addr, '\0', X25_ADDR_LEN);
705 
706 	x25->dest_addr = addr->sx25_addr;
707 
708 	/* Move to connecting socket, start sending Connect Requests */
709 	sock->state   = SS_CONNECTING;
710 	sk->sk_state  = TCP_SYN_SENT;
711 
712 	x25->state = X25_STATE_1;
713 
714 	x25_write_internal(sk, X25_CALL_REQUEST);
715 
716 	x25_start_heartbeat(sk);
717 	x25_start_t21timer(sk);
718 
719 	/* Now the loop */
720 	rc = -EINPROGRESS;
721 	if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
722 		goto out_put_neigh;
723 
724 	rc = x25_wait_for_connection_establishment(sk);
725 	if (rc)
726 		goto out_put_neigh;
727 
728 	sock->state = SS_CONNECTED;
729 	rc = 0;
730 out_put_neigh:
731 	if (rc)
732 		x25_neigh_put(x25->neighbour);
733 out_put_route:
734 	x25_route_put(rt);
735 out:
736 	release_sock(sk);
737 	return rc;
738 }
739 
740 static int x25_wait_for_data(struct sock *sk, int timeout)
741 {
742 	DECLARE_WAITQUEUE(wait, current);
743 	int rc = 0;
744 
745 	add_wait_queue_exclusive(sk->sk_sleep, &wait);
746 	for (;;) {
747 		__set_current_state(TASK_INTERRUPTIBLE);
748 		if (sk->sk_shutdown & RCV_SHUTDOWN)
749 			break;
750 		rc = -ERESTARTSYS;
751 		if (signal_pending(current))
752 			break;
753 		rc = -EAGAIN;
754 		if (!timeout)
755 			break;
756 		rc = 0;
757 		if (skb_queue_empty(&sk->sk_receive_queue)) {
758 			release_sock(sk);
759 			timeout = schedule_timeout(timeout);
760 			lock_sock(sk);
761 		} else
762 			break;
763 	}
764 	__set_current_state(TASK_RUNNING);
765 	remove_wait_queue(sk->sk_sleep, &wait);
766 	return rc;
767 }
768 
769 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
770 {
771 	struct sock *sk = sock->sk;
772 	struct sock *newsk;
773 	struct sk_buff *skb;
774 	int rc = -EINVAL;
775 
776 	if (!sk || sk->sk_state != TCP_LISTEN)
777 		goto out;
778 
779 	rc = -EOPNOTSUPP;
780 	if (sk->sk_type != SOCK_SEQPACKET)
781 		goto out;
782 
783 	lock_sock(sk);
784 	rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
785 	if (rc)
786 		goto out2;
787 	skb = skb_dequeue(&sk->sk_receive_queue);
788 	rc = -EINVAL;
789 	if (!skb->sk)
790 		goto out2;
791 	newsk		 = skb->sk;
792 	newsk->sk_socket = newsock;
793 	newsk->sk_sleep  = &newsock->wait;
794 
795 	/* Now attach up the new socket */
796 	skb->sk = NULL;
797 	kfree_skb(skb);
798 	sk->sk_ack_backlog--;
799 	newsock->sk    = newsk;
800 	newsock->state = SS_CONNECTED;
801 	rc = 0;
802 out2:
803 	release_sock(sk);
804 out:
805 	return rc;
806 }
807 
808 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
809 		       int *uaddr_len, int peer)
810 {
811 	struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
812 	struct sock *sk = sock->sk;
813 	struct x25_sock *x25 = x25_sk(sk);
814 
815 	if (peer) {
816 		if (sk->sk_state != TCP_ESTABLISHED)
817 			return -ENOTCONN;
818 		sx25->sx25_addr = x25->dest_addr;
819 	} else
820 		sx25->sx25_addr = x25->source_addr;
821 
822 	sx25->sx25_family = AF_X25;
823 	*uaddr_len = sizeof(*sx25);
824 
825 	return 0;
826 }
827 
828 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
829 			unsigned int lci)
830 {
831 	struct sock *sk;
832 	struct sock *make;
833 	struct x25_sock *makex25;
834 	struct x25_address source_addr, dest_addr;
835 	struct x25_facilities facilities;
836 	int len, rc;
837 
838 	/*
839 	 *	Remove the LCI and frame type.
840 	 */
841 	skb_pull(skb, X25_STD_MIN_LEN);
842 
843 	/*
844 	 *	Extract the X.25 addresses and convert them to ASCII strings,
845 	 *	and remove them.
846 	 */
847 	skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
848 
849 	/*
850 	 *	Get the length of the facilities, skip past them for the moment
851 	 *	get the call user data because this is needed to determine
852 	 *	the correct listener
853 	 */
854 	len = skb->data[0] + 1;
855 	skb_pull(skb,len);
856 
857 	/*
858 	 *	Find a listener for the particular address/cud pair.
859 	 */
860 	sk = x25_find_listener(&source_addr,skb);
861 	skb_push(skb,len);
862 
863 	/*
864 	 *	We can't accept the Call Request.
865 	 */
866 	if (sk == NULL || sk_acceptq_is_full(sk))
867 		goto out_clear_request;
868 
869 	/*
870 	 *	Try to reach a compromise on the requested facilities.
871 	 */
872 	if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
873 		goto out_sock_put;
874 
875 	/*
876 	 * current neighbour/link might impose additional limits
877 	 * on certain facilties
878 	 */
879 
880 	x25_limit_facilities(&facilities, nb);
881 
882 	/*
883 	 *	Try to create a new socket.
884 	 */
885 	make = x25_make_new(sk);
886 	if (!make)
887 		goto out_sock_put;
888 
889 	/*
890 	 *	Remove the facilities
891 	 */
892 	skb_pull(skb, len);
893 
894 	skb->sk     = make;
895 	make->sk_state = TCP_ESTABLISHED;
896 
897 	makex25 = x25_sk(make);
898 	makex25->lci           = lci;
899 	makex25->dest_addr     = dest_addr;
900 	makex25->source_addr   = source_addr;
901 	makex25->neighbour     = nb;
902 	makex25->facilities    = facilities;
903 	makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
904 	/* ensure no reverse facil on accept */
905 	makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
906 	makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
907 
908 	/* Normally all calls are accepted immediatly */
909 	if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
910 		x25_write_internal(make, X25_CALL_ACCEPTED);
911 		makex25->state = X25_STATE_3;
912 	}
913 
914 	/*
915 	 *	Incoming Call User Data.
916 	 */
917 	if (skb->len >= 0) {
918 		memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
919 		makex25->calluserdata.cudlength = skb->len;
920 	}
921 
922 	sk->sk_ack_backlog++;
923 
924 	x25_insert_socket(make);
925 
926 	skb_queue_head(&sk->sk_receive_queue, skb);
927 
928 	x25_start_heartbeat(make);
929 
930 	if (!sock_flag(sk, SOCK_DEAD))
931 		sk->sk_data_ready(sk, skb->len);
932 	rc = 1;
933 	sock_put(sk);
934 out:
935 	return rc;
936 out_sock_put:
937 	sock_put(sk);
938 out_clear_request:
939 	rc = 0;
940 	x25_transmit_clear_request(nb, lci, 0x01);
941 	goto out;
942 }
943 
944 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
945 		       struct msghdr *msg, size_t len)
946 {
947 	struct sock *sk = sock->sk;
948 	struct x25_sock *x25 = x25_sk(sk);
949 	struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
950 	struct sockaddr_x25 sx25;
951 	struct sk_buff *skb;
952 	unsigned char *asmptr;
953 	int noblock = msg->msg_flags & MSG_DONTWAIT;
954 	size_t size;
955 	int qbit = 0, rc = -EINVAL;
956 
957 	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
958 		goto out;
959 
960 	/* we currently don't support segmented records at the user interface */
961 	if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
962 		goto out;
963 
964 	rc = -EADDRNOTAVAIL;
965 	if (sock_flag(sk, SOCK_ZAPPED))
966 		goto out;
967 
968 	rc = -EPIPE;
969 	if (sk->sk_shutdown & SEND_SHUTDOWN) {
970 		send_sig(SIGPIPE, current, 0);
971 		goto out;
972 	}
973 
974 	rc = -ENETUNREACH;
975 	if (!x25->neighbour)
976 		goto out;
977 
978 	if (usx25) {
979 		rc = -EINVAL;
980 		if (msg->msg_namelen < sizeof(sx25))
981 			goto out;
982 		memcpy(&sx25, usx25, sizeof(sx25));
983 		rc = -EISCONN;
984 		if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
985 			goto out;
986 		rc = -EINVAL;
987 		if (sx25.sx25_family != AF_X25)
988 			goto out;
989 	} else {
990 		/*
991 		 *	FIXME 1003.1g - if the socket is like this because
992 		 *	it has become closed (not started closed) we ought
993 		 *	to SIGPIPE, EPIPE;
994 		 */
995 		rc = -ENOTCONN;
996 		if (sk->sk_state != TCP_ESTABLISHED)
997 			goto out;
998 
999 		sx25.sx25_family = AF_X25;
1000 		sx25.sx25_addr   = x25->dest_addr;
1001 	}
1002 
1003 	SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1004 
1005 	/* Build a packet */
1006 	SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1007 
1008 	if ((msg->msg_flags & MSG_OOB) && len > 32)
1009 		len = 32;
1010 
1011 	size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1012 
1013 	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1014 	if (!skb)
1015 		goto out;
1016 	X25_SKB_CB(skb)->flags = msg->msg_flags;
1017 
1018 	skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1019 
1020 	/*
1021 	 *	Put the data on the end
1022 	 */
1023 	SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1024 
1025 	asmptr = skb->h.raw = skb_put(skb, len);
1026 
1027 	rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1028 	if (rc)
1029 		goto out_kfree_skb;
1030 
1031 	/*
1032 	 *	If the Q BIT Include socket option is in force, the first
1033 	 *	byte of the user data is the logical value of the Q Bit.
1034 	 */
1035 	if (x25->qbitincl) {
1036 		qbit = skb->data[0];
1037 		skb_pull(skb, 1);
1038 	}
1039 
1040 	/*
1041 	 *	Push down the X.25 header
1042 	 */
1043 	SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1044 
1045 	if (msg->msg_flags & MSG_OOB) {
1046 		if (x25->neighbour->extended) {
1047 			asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1048 			*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1049 			*asmptr++ = (x25->lci >> 0) & 0xFF;
1050 			*asmptr++ = X25_INTERRUPT;
1051 		} else {
1052 			asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1053 			*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1054 			*asmptr++ = (x25->lci >> 0) & 0xFF;
1055 			*asmptr++ = X25_INTERRUPT;
1056 		}
1057 	} else {
1058 		if (x25->neighbour->extended) {
1059 			/* Build an Extended X.25 header */
1060 			asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1061 			*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1062 			*asmptr++ = (x25->lci >> 0) & 0xFF;
1063 			*asmptr++ = X25_DATA;
1064 			*asmptr++ = X25_DATA;
1065 		} else {
1066 			/* Build an Standard X.25 header */
1067 			asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1068 			*asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1069 			*asmptr++ = (x25->lci >> 0) & 0xFF;
1070 			*asmptr++ = X25_DATA;
1071 		}
1072 
1073 		if (qbit)
1074 			skb->data[0] |= X25_Q_BIT;
1075 	}
1076 
1077 	SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1078 	SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1079 
1080 	rc = -ENOTCONN;
1081 	if (sk->sk_state != TCP_ESTABLISHED)
1082 		goto out_kfree_skb;
1083 
1084 	if (msg->msg_flags & MSG_OOB)
1085 		skb_queue_tail(&x25->interrupt_out_queue, skb);
1086 	else {
1087 	        len = x25_output(sk, skb);
1088 		if (len < 0)
1089 			kfree_skb(skb);
1090 		else if (x25->qbitincl)
1091 			len++;
1092 	}
1093 
1094 	/*
1095 	 * lock_sock() is currently only used to serialize this x25_kick()
1096 	 * against input-driven x25_kick() calls. It currently only blocks
1097 	 * incoming packets for this socket and does not protect against
1098 	 * any other socket state changes and is not called from anywhere
1099 	 * else. As x25_kick() cannot block and as long as all socket
1100 	 * operations are BKL-wrapped, we don't need take to care about
1101 	 * purging the backlog queue in x25_release().
1102 	 *
1103 	 * Using lock_sock() to protect all socket operations entirely
1104 	 * (and making the whole x25 stack SMP aware) unfortunately would
1105 	 * require major changes to {send,recv}msg and skb allocation methods.
1106 	 * -> 2.5 ;)
1107 	 */
1108 	lock_sock(sk);
1109 	x25_kick(sk);
1110 	release_sock(sk);
1111 	rc = len;
1112 out:
1113 	return rc;
1114 out_kfree_skb:
1115 	kfree_skb(skb);
1116 	goto out;
1117 }
1118 
1119 
1120 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1121 		       struct msghdr *msg, size_t size,
1122 		       int flags)
1123 {
1124 	struct sock *sk = sock->sk;
1125 	struct x25_sock *x25 = x25_sk(sk);
1126 	struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1127 	size_t copied;
1128 	int qbit;
1129 	struct sk_buff *skb;
1130 	unsigned char *asmptr;
1131 	int rc = -ENOTCONN;
1132 
1133 	/*
1134 	 * This works for seqpacket too. The receiver has ordered the queue for
1135 	 * us! We do one quick check first though
1136 	 */
1137 	if (sk->sk_state != TCP_ESTABLISHED)
1138 		goto out;
1139 
1140 	if (flags & MSG_OOB) {
1141 		rc = -EINVAL;
1142 		if (sock_flag(sk, SOCK_URGINLINE) ||
1143 		    !skb_peek(&x25->interrupt_in_queue))
1144 			goto out;
1145 
1146 		skb = skb_dequeue(&x25->interrupt_in_queue);
1147 
1148 		skb_pull(skb, X25_STD_MIN_LEN);
1149 
1150 		/*
1151 		 *	No Q bit information on Interrupt data.
1152 		 */
1153 		if (x25->qbitincl) {
1154 			asmptr  = skb_push(skb, 1);
1155 			*asmptr = 0x00;
1156 		}
1157 
1158 		msg->msg_flags |= MSG_OOB;
1159 	} else {
1160 		/* Now we can treat all alike */
1161 		skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1162 					flags & MSG_DONTWAIT, &rc);
1163 		if (!skb)
1164 			goto out;
1165 
1166 		qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1167 
1168 		skb_pull(skb, x25->neighbour->extended ?
1169 				X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1170 
1171 		if (x25->qbitincl) {
1172 			asmptr  = skb_push(skb, 1);
1173 			*asmptr = qbit;
1174 		}
1175 	}
1176 
1177 	skb->h.raw = skb->data;
1178 
1179 	copied = skb->len;
1180 
1181 	if (copied > size) {
1182 		copied = size;
1183 		msg->msg_flags |= MSG_TRUNC;
1184 	}
1185 
1186 	/* Currently, each datagram always contains a complete record */
1187 	msg->msg_flags |= MSG_EOR;
1188 
1189 	rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1190 	if (rc)
1191 		goto out_free_dgram;
1192 
1193 	if (sx25) {
1194 		sx25->sx25_family = AF_X25;
1195 		sx25->sx25_addr   = x25->dest_addr;
1196 	}
1197 
1198 	msg->msg_namelen = sizeof(struct sockaddr_x25);
1199 
1200 	lock_sock(sk);
1201 	x25_check_rbuf(sk);
1202 	release_sock(sk);
1203 	rc = copied;
1204 out_free_dgram:
1205 	skb_free_datagram(sk, skb);
1206 out:
1207 	return rc;
1208 }
1209 
1210 
1211 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1212 {
1213 	struct sock *sk = sock->sk;
1214 	struct x25_sock *x25 = x25_sk(sk);
1215 	void __user *argp = (void __user *)arg;
1216 	int rc;
1217 
1218 	switch (cmd) {
1219 		case TIOCOUTQ: {
1220 			int amount = sk->sk_sndbuf -
1221 				     atomic_read(&sk->sk_wmem_alloc);
1222 			if (amount < 0)
1223 				amount = 0;
1224 			rc = put_user(amount, (unsigned int __user *)argp);
1225 			break;
1226 		}
1227 
1228 		case TIOCINQ: {
1229 			struct sk_buff *skb;
1230 			int amount = 0;
1231 			/*
1232 			 * These two are safe on a single CPU system as
1233 			 * only user tasks fiddle here
1234 			 */
1235 			if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1236 				amount = skb->len;
1237 			rc = put_user(amount, (unsigned int __user *)argp);
1238 			break;
1239 		}
1240 
1241 		case SIOCGSTAMP:
1242 			rc = -EINVAL;
1243 			if (sk)
1244 				rc = sock_get_timestamp(sk,
1245 						(struct timeval __user *)argp);
1246 			break;
1247 		case SIOCGIFADDR:
1248 		case SIOCSIFADDR:
1249 		case SIOCGIFDSTADDR:
1250 		case SIOCSIFDSTADDR:
1251 		case SIOCGIFBRDADDR:
1252 		case SIOCSIFBRDADDR:
1253 		case SIOCGIFNETMASK:
1254 		case SIOCSIFNETMASK:
1255 		case SIOCGIFMETRIC:
1256 		case SIOCSIFMETRIC:
1257 			rc = -EINVAL;
1258 			break;
1259 		case SIOCADDRT:
1260 		case SIOCDELRT:
1261 			rc = -EPERM;
1262 			if (!capable(CAP_NET_ADMIN))
1263 				break;
1264 			rc = x25_route_ioctl(cmd, argp);
1265 			break;
1266 		case SIOCX25GSUBSCRIP:
1267 			rc = x25_subscr_ioctl(cmd, argp);
1268 			break;
1269 		case SIOCX25SSUBSCRIP:
1270 			rc = -EPERM;
1271 			if (!capable(CAP_NET_ADMIN))
1272 				break;
1273 			rc = x25_subscr_ioctl(cmd, argp);
1274 			break;
1275 		case SIOCX25GFACILITIES: {
1276 			struct x25_facilities fac = x25->facilities;
1277 			rc = copy_to_user(argp, &fac,
1278 					  sizeof(fac)) ? -EFAULT : 0;
1279 			break;
1280 		}
1281 
1282 		case SIOCX25SFACILITIES: {
1283 			struct x25_facilities facilities;
1284 			rc = -EFAULT;
1285 			if (copy_from_user(&facilities, argp,
1286 					   sizeof(facilities)))
1287 				break;
1288 			rc = -EINVAL;
1289 			if (sk->sk_state != TCP_LISTEN &&
1290 			    sk->sk_state != TCP_CLOSE)
1291 				break;
1292 			if (facilities.pacsize_in < X25_PS16 ||
1293 			    facilities.pacsize_in > X25_PS4096)
1294 				break;
1295 			if (facilities.pacsize_out < X25_PS16 ||
1296 			    facilities.pacsize_out > X25_PS4096)
1297 				break;
1298 			if (facilities.winsize_in < 1 ||
1299 			    facilities.winsize_in > 127)
1300 				break;
1301 			if (facilities.throughput < 0x03 ||
1302 			    facilities.throughput > 0xDD)
1303 				break;
1304 			if (facilities.reverse &&
1305 				(facilities.reverse | 0x81)!= 0x81)
1306 				break;
1307 			x25->facilities = facilities;
1308 			rc = 0;
1309 			break;
1310 		}
1311 
1312 		case SIOCX25GCALLUSERDATA: {
1313 			struct x25_calluserdata cud = x25->calluserdata;
1314 			rc = copy_to_user(argp, &cud,
1315 					  sizeof(cud)) ? -EFAULT : 0;
1316 			break;
1317 		}
1318 
1319 		case SIOCX25SCALLUSERDATA: {
1320 			struct x25_calluserdata calluserdata;
1321 
1322 			rc = -EFAULT;
1323 			if (copy_from_user(&calluserdata, argp,
1324 					   sizeof(calluserdata)))
1325 				break;
1326 			rc = -EINVAL;
1327 			if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1328 				break;
1329 			x25->calluserdata = calluserdata;
1330 			rc = 0;
1331 			break;
1332 		}
1333 
1334 		case SIOCX25GCAUSEDIAG: {
1335 			struct x25_causediag causediag;
1336 			causediag = x25->causediag;
1337 			rc = copy_to_user(argp, &causediag,
1338 					  sizeof(causediag)) ? -EFAULT : 0;
1339 			break;
1340 		}
1341 
1342 		case SIOCX25SCUDMATCHLEN: {
1343 			struct x25_subaddr sub_addr;
1344 			rc = -EINVAL;
1345 			if(sk->sk_state != TCP_CLOSE)
1346 				break;
1347 			rc = -EFAULT;
1348 			if (copy_from_user(&sub_addr, argp,
1349 					sizeof(sub_addr)))
1350 				break;
1351 		 	rc = -EINVAL;
1352 			if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1353 				break;
1354 			x25->cudmatchlength = sub_addr.cudmatchlength;
1355 			rc = 0;
1356 			break;
1357 		}
1358 
1359 		case SIOCX25CALLACCPTAPPRV: {
1360 			rc = -EINVAL;
1361 			if (sk->sk_state != TCP_CLOSE)
1362 				break;
1363 			x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1364 			rc = 0;
1365 			break;
1366 		}
1367 
1368 		case SIOCX25SENDCALLACCPT:  {
1369 			rc = -EINVAL;
1370 			if (sk->sk_state != TCP_ESTABLISHED)
1371 				break;
1372 			if (x25->accptapprv)	/* must call accptapprv above */
1373 				break;
1374 			x25_write_internal(sk, X25_CALL_ACCEPTED);
1375 			x25->state = X25_STATE_3;
1376 			rc = 0;
1377 			break;
1378 		}
1379 
1380  		default:
1381 			rc = dev_ioctl(cmd, argp);
1382 			break;
1383 	}
1384 
1385 	return rc;
1386 }
1387 
1388 static struct net_proto_family x25_family_ops = {
1389 	.family =	AF_X25,
1390 	.create =	x25_create,
1391 	.owner	=	THIS_MODULE,
1392 };
1393 
1394 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1395 	.family =	AF_X25,
1396 	.owner =	THIS_MODULE,
1397 	.release =	x25_release,
1398 	.bind =		x25_bind,
1399 	.connect =	x25_connect,
1400 	.socketpair =	sock_no_socketpair,
1401 	.accept =	x25_accept,
1402 	.getname =	x25_getname,
1403 	.poll =		datagram_poll,
1404 	.ioctl =	x25_ioctl,
1405 	.listen =	x25_listen,
1406 	.shutdown =	sock_no_shutdown,
1407 	.setsockopt =	x25_setsockopt,
1408 	.getsockopt =	x25_getsockopt,
1409 	.sendmsg =	x25_sendmsg,
1410 	.recvmsg =	x25_recvmsg,
1411 	.mmap =		sock_no_mmap,
1412 	.sendpage =	sock_no_sendpage,
1413 };
1414 
1415 #include <linux/smp_lock.h>
1416 SOCKOPS_WRAP(x25_proto, AF_X25);
1417 
1418 static struct packet_type x25_packet_type = {
1419 	.type =	__constant_htons(ETH_P_X25),
1420 	.func =	x25_lapb_receive_frame,
1421 };
1422 
1423 static struct notifier_block x25_dev_notifier = {
1424 	.notifier_call = x25_device_event,
1425 };
1426 
1427 void x25_kill_by_neigh(struct x25_neigh *nb)
1428 {
1429 	struct sock *s;
1430 	struct hlist_node *node;
1431 
1432 	write_lock_bh(&x25_list_lock);
1433 
1434 	sk_for_each(s, node, &x25_list)
1435 		if (x25_sk(s)->neighbour == nb)
1436 			x25_disconnect(s, ENETUNREACH, 0, 0);
1437 
1438 	write_unlock_bh(&x25_list_lock);
1439 }
1440 
1441 static int __init x25_init(void)
1442 {
1443 	int rc = proto_register(&x25_proto, 0);
1444 
1445 	if (rc != 0)
1446 		goto out;
1447 
1448 	sock_register(&x25_family_ops);
1449 
1450 	dev_add_pack(&x25_packet_type);
1451 
1452 	register_netdevice_notifier(&x25_dev_notifier);
1453 
1454 	printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1455 
1456 #ifdef CONFIG_SYSCTL
1457 	x25_register_sysctl();
1458 #endif
1459 	x25_proc_init();
1460 out:
1461 	return rc;
1462 }
1463 module_init(x25_init);
1464 
1465 static void __exit x25_exit(void)
1466 {
1467 	x25_proc_exit();
1468 	x25_link_free();
1469 	x25_route_free();
1470 
1471 #ifdef CONFIG_SYSCTL
1472 	x25_unregister_sysctl();
1473 #endif
1474 
1475 	unregister_netdevice_notifier(&x25_dev_notifier);
1476 
1477 	dev_remove_pack(&x25_packet_type);
1478 
1479 	sock_unregister(AF_X25);
1480 	proto_unregister(&x25_proto);
1481 }
1482 module_exit(x25_exit);
1483 
1484 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1485 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1486 MODULE_LICENSE("GPL");
1487 MODULE_ALIAS_NETPROTO(PF_X25);
1488