bfabaf9cba873fa1739460e8dc08dc91f5237bf9
[linux-2.6.git] / net / x25 / af_x25.c
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 const 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         sock_copy_flags(sk, osk);
544
545         ox25 = x25_sk(osk);
546         x25->t21        = ox25->t21;
547         x25->t22        = ox25->t22;
548         x25->t23        = ox25->t23;
549         x25->t2         = ox25->t2;
550         x25->facilities = ox25->facilities;
551         x25->qbitincl   = ox25->qbitincl;
552         x25->cudmatchlength = ox25->cudmatchlength;
553         x25->accptapprv = ox25->accptapprv;
554
555         x25_init_timers(sk);
556 out:
557         return sk;
558 }
559
560 static int x25_release(struct socket *sock)
561 {
562         struct sock *sk = sock->sk;
563         struct x25_sock *x25;
564
565         if (!sk)
566                 goto out;
567
568         x25 = x25_sk(sk);
569
570         switch (x25->state) {
571
572                 case X25_STATE_0:
573                 case X25_STATE_2:
574                         x25_disconnect(sk, 0, 0, 0);
575                         x25_destroy_socket(sk);
576                         goto out;
577
578                 case X25_STATE_1:
579                 case X25_STATE_3:
580                 case X25_STATE_4:
581                         x25_clear_queues(sk);
582                         x25_write_internal(sk, X25_CLEAR_REQUEST);
583                         x25_start_t23timer(sk);
584                         x25->state = X25_STATE_2;
585                         sk->sk_state    = TCP_CLOSE;
586                         sk->sk_shutdown |= SEND_SHUTDOWN;
587                         sk->sk_state_change(sk);
588                         sock_set_flag(sk, SOCK_DEAD);
589                         sock_set_flag(sk, SOCK_DESTROY);
590                         break;
591         }
592
593         sock->sk        = NULL; 
594         sk->sk_socket   = NULL; /* Not used, but we should do this */
595 out:
596         return 0;
597 }
598
599 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
600 {
601         struct sock *sk = sock->sk;
602         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
603
604         if (!sock_flag(sk, SOCK_ZAPPED) ||
605             addr_len != sizeof(struct sockaddr_x25) ||
606             addr->sx25_family != AF_X25)
607                 return -EINVAL;
608
609         x25_sk(sk)->source_addr = addr->sx25_addr;
610         x25_insert_socket(sk);
611         sock_reset_flag(sk, SOCK_ZAPPED);
612         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
613
614         return 0;
615 }
616
617 static int x25_wait_for_connection_establishment(struct sock *sk)
618 {
619         DECLARE_WAITQUEUE(wait, current);
620         int rc;
621
622         add_wait_queue_exclusive(sk->sk_sleep, &wait);
623         for (;;) {
624                 __set_current_state(TASK_INTERRUPTIBLE);
625                 rc = -ERESTARTSYS;
626                 if (signal_pending(current))
627                         break;
628                 rc = sock_error(sk);
629                 if (rc) {
630                         sk->sk_socket->state = SS_UNCONNECTED;
631                         break;
632                 }
633                 rc = 0;
634                 if (sk->sk_state != TCP_ESTABLISHED) {
635                         release_sock(sk);
636                         schedule();
637                         lock_sock(sk);
638                 } else
639                         break;
640         }
641         __set_current_state(TASK_RUNNING);
642         remove_wait_queue(sk->sk_sleep, &wait);
643         return rc;
644 }
645
646 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
647                        int addr_len, int flags)
648 {
649         struct sock *sk = sock->sk;
650         struct x25_sock *x25 = x25_sk(sk);
651         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
652         struct x25_route *rt;
653         int rc = 0;
654
655         lock_sock(sk);
656         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
657                 sock->state = SS_CONNECTED;
658                 goto out; /* Connect completed during a ERESTARTSYS event */
659         }
660
661         rc = -ECONNREFUSED;
662         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
663                 sock->state = SS_UNCONNECTED;
664                 goto out;
665         }
666
667         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
668         if (sk->sk_state == TCP_ESTABLISHED)
669                 goto out;
670
671         sk->sk_state   = TCP_CLOSE;     
672         sock->state = SS_UNCONNECTED;
673
674         rc = -EINVAL;
675         if (addr_len != sizeof(struct sockaddr_x25) ||
676             addr->sx25_family != AF_X25)
677                 goto out;
678
679         rc = -ENETUNREACH;
680         rt = x25_get_route(&addr->sx25_addr);
681         if (!rt)
682                 goto out;
683
684         x25->neighbour = x25_get_neigh(rt->dev);
685         if (!x25->neighbour)
686                 goto out_put_route;
687
688         x25_limit_facilities(&x25->facilities, x25->neighbour);
689
690         x25->lci = x25_new_lci(x25->neighbour);
691         if (!x25->lci)
692                 goto out_put_neigh;
693
694         rc = -EINVAL;
695         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
696                 goto out_put_neigh;
697
698         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
699                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
700
701         x25->dest_addr = addr->sx25_addr;
702
703         /* Move to connecting socket, start sending Connect Requests */
704         sock->state   = SS_CONNECTING;
705         sk->sk_state  = TCP_SYN_SENT;
706
707         x25->state = X25_STATE_1;
708
709         x25_write_internal(sk, X25_CALL_REQUEST);
710
711         x25_start_heartbeat(sk);
712         x25_start_t21timer(sk);
713
714         /* Now the loop */
715         rc = -EINPROGRESS;
716         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
717                 goto out_put_neigh;
718
719         rc = x25_wait_for_connection_establishment(sk);
720         if (rc)
721                 goto out_put_neigh;
722
723         sock->state = SS_CONNECTED;
724         rc = 0;
725 out_put_neigh:
726         if (rc)
727                 x25_neigh_put(x25->neighbour);
728 out_put_route:
729         x25_route_put(rt);
730 out:
731         release_sock(sk);
732         return rc;
733 }
734
735 static int x25_wait_for_data(struct sock *sk, int timeout)
736 {
737         DECLARE_WAITQUEUE(wait, current);
738         int rc = 0;
739
740         add_wait_queue_exclusive(sk->sk_sleep, &wait);
741         for (;;) {
742                 __set_current_state(TASK_INTERRUPTIBLE);
743                 if (sk->sk_shutdown & RCV_SHUTDOWN)
744                         break;
745                 rc = -ERESTARTSYS;
746                 if (signal_pending(current))
747                         break;
748                 rc = -EAGAIN;
749                 if (!timeout)
750                         break;
751                 rc = 0;
752                 if (skb_queue_empty(&sk->sk_receive_queue)) {
753                         release_sock(sk);
754                         timeout = schedule_timeout(timeout);
755                         lock_sock(sk);
756                 } else
757                         break;
758         }
759         __set_current_state(TASK_RUNNING);
760         remove_wait_queue(sk->sk_sleep, &wait);
761         return rc;
762 }
763         
764 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
765 {
766         struct sock *sk = sock->sk;
767         struct sock *newsk;
768         struct sk_buff *skb;
769         int rc = -EINVAL;
770
771         if (!sk || sk->sk_state != TCP_LISTEN)
772                 goto out;
773
774         rc = -EOPNOTSUPP;
775         if (sk->sk_type != SOCK_SEQPACKET)
776                 goto out;
777
778         lock_sock(sk);
779         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
780         if (rc)
781                 goto out2;
782         skb = skb_dequeue(&sk->sk_receive_queue);
783         rc = -EINVAL;
784         if (!skb->sk)
785                 goto out2;
786         newsk            = skb->sk;
787         newsk->sk_socket = newsock;
788         newsk->sk_sleep  = &newsock->wait;
789
790         /* Now attach up the new socket */
791         skb->sk = NULL;
792         kfree_skb(skb);
793         sk->sk_ack_backlog--;
794         newsock->sk    = newsk;
795         newsock->state = SS_CONNECTED;
796         rc = 0;
797 out2:
798         release_sock(sk);
799 out:
800         return rc;
801 }
802
803 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
804                        int *uaddr_len, int peer)
805 {
806         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
807         struct sock *sk = sock->sk;
808         struct x25_sock *x25 = x25_sk(sk);
809
810         if (peer) {
811                 if (sk->sk_state != TCP_ESTABLISHED)
812                         return -ENOTCONN;
813                 sx25->sx25_addr = x25->dest_addr;
814         } else
815                 sx25->sx25_addr = x25->source_addr;
816
817         sx25->sx25_family = AF_X25;
818         *uaddr_len = sizeof(*sx25);
819
820         return 0;
821 }
822  
823 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
824                         unsigned int lci)
825 {
826         struct sock *sk;
827         struct sock *make;
828         struct x25_sock *makex25;
829         struct x25_address source_addr, dest_addr;
830         struct x25_facilities facilities;
831         int len, rc;
832
833         /*
834          *      Remove the LCI and frame type.
835          */
836         skb_pull(skb, X25_STD_MIN_LEN);
837
838         /*
839          *      Extract the X.25 addresses and convert them to ASCII strings,
840          *      and remove them.
841          */
842         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
843
844         /*
845          *      Get the length of the facilities, skip past them for the moment
846          *      get the call user data because this is needed to determine
847          *      the correct listener
848          */
849         len = skb->data[0] + 1;
850         skb_pull(skb,len);
851
852         /*
853          *      Find a listener for the particular address/cud pair.
854          */
855         sk = x25_find_listener(&source_addr,skb);
856         skb_push(skb,len);
857
858         /*
859          *      We can't accept the Call Request.
860          */
861         if (sk == NULL || sk_acceptq_is_full(sk))
862                 goto out_clear_request;
863
864         /*
865          *      Try to reach a compromise on the requested facilities.
866          */
867         if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
868                 goto out_sock_put;
869
870         /*
871          * current neighbour/link might impose additional limits
872          * on certain facilties
873          */
874
875         x25_limit_facilities(&facilities, nb);
876
877         /*
878          *      Try to create a new socket.
879          */
880         make = x25_make_new(sk);
881         if (!make)
882                 goto out_sock_put;
883
884         /*
885          *      Remove the facilities
886          */
887         skb_pull(skb, len);
888
889         skb->sk     = make;
890         make->sk_state = TCP_ESTABLISHED;
891
892         makex25 = x25_sk(make);
893         makex25->lci           = lci;
894         makex25->dest_addr     = dest_addr;
895         makex25->source_addr   = source_addr;
896         makex25->neighbour     = nb;
897         makex25->facilities    = facilities;
898         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
899         /* ensure no reverse facil on accept */
900         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
901         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
902
903         /* Normally all calls are accepted immediatly */
904         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
905                 x25_write_internal(make, X25_CALL_ACCEPTED);
906                 makex25->state = X25_STATE_3;
907         }
908
909         /*
910          *      Incoming Call User Data.
911          */
912         if (skb->len >= 0) {
913                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
914                 makex25->calluserdata.cudlength = skb->len;
915         }
916
917         sk->sk_ack_backlog++;
918
919         x25_insert_socket(make);
920
921         skb_queue_head(&sk->sk_receive_queue, skb);
922
923         x25_start_heartbeat(make);
924
925         if (!sock_flag(sk, SOCK_DEAD))
926                 sk->sk_data_ready(sk, skb->len);
927         rc = 1;
928         sock_put(sk);
929 out:
930         return rc;
931 out_sock_put:
932         sock_put(sk);
933 out_clear_request:
934         rc = 0;
935         x25_transmit_clear_request(nb, lci, 0x01);
936         goto out;
937 }
938
939 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
940                        struct msghdr *msg, size_t len)
941 {
942         struct sock *sk = sock->sk;
943         struct x25_sock *x25 = x25_sk(sk);
944         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
945         struct sockaddr_x25 sx25;
946         struct sk_buff *skb;
947         unsigned char *asmptr;
948         int noblock = msg->msg_flags & MSG_DONTWAIT;
949         size_t size;
950         int qbit = 0, rc = -EINVAL;
951
952         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
953                 goto out;
954
955         /* we currently don't support segmented records at the user interface */
956         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
957                 goto out;
958
959         rc = -EADDRNOTAVAIL;
960         if (sock_flag(sk, SOCK_ZAPPED))
961                 goto out;
962
963         rc = -EPIPE;
964         if (sk->sk_shutdown & SEND_SHUTDOWN) {
965                 send_sig(SIGPIPE, current, 0);
966                 goto out;
967         }
968
969         rc = -ENETUNREACH;
970         if (!x25->neighbour)
971                 goto out;
972
973         if (usx25) {
974                 rc = -EINVAL;
975                 if (msg->msg_namelen < sizeof(sx25))
976                         goto out;
977                 memcpy(&sx25, usx25, sizeof(sx25));
978                 rc = -EISCONN;
979                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
980                         goto out;
981                 rc = -EINVAL;
982                 if (sx25.sx25_family != AF_X25)
983                         goto out;
984         } else {
985                 /*
986                  *      FIXME 1003.1g - if the socket is like this because
987                  *      it has become closed (not started closed) we ought
988                  *      to SIGPIPE, EPIPE;
989                  */
990                 rc = -ENOTCONN;
991                 if (sk->sk_state != TCP_ESTABLISHED)
992                         goto out;
993
994                 sx25.sx25_family = AF_X25;
995                 sx25.sx25_addr   = x25->dest_addr;
996         }
997
998         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
999
1000         /* Build a packet */
1001         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1002
1003         if ((msg->msg_flags & MSG_OOB) && len > 32)
1004                 len = 32;
1005
1006         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1007
1008         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1009         if (!skb)
1010                 goto out;
1011         X25_SKB_CB(skb)->flags = msg->msg_flags;
1012
1013         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1014
1015         /*
1016          *      Put the data on the end
1017          */
1018         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1019
1020         asmptr = skb->h.raw = skb_put(skb, len);
1021
1022         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1023         if (rc)
1024                 goto out_kfree_skb;
1025
1026         /*
1027          *      If the Q BIT Include socket option is in force, the first
1028          *      byte of the user data is the logical value of the Q Bit.
1029          */
1030         if (x25->qbitincl) {
1031                 qbit = skb->data[0];
1032                 skb_pull(skb, 1);
1033         }
1034
1035         /*
1036          *      Push down the X.25 header
1037          */
1038         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1039
1040         if (msg->msg_flags & MSG_OOB) {
1041                 if (x25->neighbour->extended) {
1042                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1043                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1044                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1045                         *asmptr++ = X25_INTERRUPT;
1046                 } else {
1047                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1048                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1049                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1050                         *asmptr++ = X25_INTERRUPT;
1051                 }
1052         } else {
1053                 if (x25->neighbour->extended) {
1054                         /* Build an Extended X.25 header */
1055                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1056                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1057                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1058                         *asmptr++ = X25_DATA;
1059                         *asmptr++ = X25_DATA;
1060                 } else {
1061                         /* Build an Standard X.25 header */
1062                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1063                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1064                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1065                         *asmptr++ = X25_DATA;
1066                 }
1067
1068                 if (qbit)
1069                         skb->data[0] |= X25_Q_BIT;
1070         }
1071
1072         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1073         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1074
1075         rc = -ENOTCONN;
1076         if (sk->sk_state != TCP_ESTABLISHED)
1077                 goto out_kfree_skb;
1078
1079         if (msg->msg_flags & MSG_OOB)
1080                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1081         else {
1082                 len = x25_output(sk, skb);
1083                 if (len < 0)
1084                         kfree_skb(skb);
1085                 else if (x25->qbitincl)
1086                         len++;
1087         }
1088
1089         /*
1090          * lock_sock() is currently only used to serialize this x25_kick()
1091          * against input-driven x25_kick() calls. It currently only blocks
1092          * incoming packets for this socket and does not protect against
1093          * any other socket state changes and is not called from anywhere
1094          * else. As x25_kick() cannot block and as long as all socket
1095          * operations are BKL-wrapped, we don't need take to care about
1096          * purging the backlog queue in x25_release().
1097          *
1098          * Using lock_sock() to protect all socket operations entirely
1099          * (and making the whole x25 stack SMP aware) unfortunately would
1100          * require major changes to {send,recv}msg and skb allocation methods.
1101          * -> 2.5 ;)
1102          */
1103         lock_sock(sk);
1104         x25_kick(sk);
1105         release_sock(sk);
1106         rc = len;
1107 out:
1108         return rc;
1109 out_kfree_skb:
1110         kfree_skb(skb);
1111         goto out;
1112 }
1113
1114
1115 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1116                        struct msghdr *msg, size_t size,
1117                        int flags)
1118 {
1119         struct sock *sk = sock->sk;
1120         struct x25_sock *x25 = x25_sk(sk);
1121         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1122         size_t copied;
1123         int qbit;
1124         struct sk_buff *skb;
1125         unsigned char *asmptr;
1126         int rc = -ENOTCONN;
1127
1128         /*
1129          * This works for seqpacket too. The receiver has ordered the queue for
1130          * us! We do one quick check first though
1131          */
1132         if (sk->sk_state != TCP_ESTABLISHED)
1133                 goto out;
1134
1135         if (flags & MSG_OOB) {
1136                 rc = -EINVAL;
1137                 if (sock_flag(sk, SOCK_URGINLINE) ||
1138                     !skb_peek(&x25->interrupt_in_queue))
1139                         goto out;
1140
1141                 skb = skb_dequeue(&x25->interrupt_in_queue);
1142
1143                 skb_pull(skb, X25_STD_MIN_LEN);
1144
1145                 /*
1146                  *      No Q bit information on Interrupt data.
1147                  */
1148                 if (x25->qbitincl) {
1149                         asmptr  = skb_push(skb, 1);
1150                         *asmptr = 0x00;
1151                 }
1152
1153                 msg->msg_flags |= MSG_OOB;
1154         } else {
1155                 /* Now we can treat all alike */
1156                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1157                                         flags & MSG_DONTWAIT, &rc);
1158                 if (!skb)
1159                         goto out;
1160
1161                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1162
1163                 skb_pull(skb, x25->neighbour->extended ?
1164                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1165
1166                 if (x25->qbitincl) {
1167                         asmptr  = skb_push(skb, 1);
1168                         *asmptr = qbit;
1169                 }
1170         }
1171
1172         skb->h.raw = skb->data;
1173
1174         copied = skb->len;
1175
1176         if (copied > size) {
1177                 copied = size;
1178                 msg->msg_flags |= MSG_TRUNC;
1179         }
1180
1181         /* Currently, each datagram always contains a complete record */ 
1182         msg->msg_flags |= MSG_EOR;
1183
1184         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1185         if (rc)
1186                 goto out_free_dgram;
1187
1188         if (sx25) {
1189                 sx25->sx25_family = AF_X25;
1190                 sx25->sx25_addr   = x25->dest_addr;
1191         }
1192
1193         msg->msg_namelen = sizeof(struct sockaddr_x25);
1194
1195         lock_sock(sk);
1196         x25_check_rbuf(sk);
1197         release_sock(sk);
1198         rc = copied;
1199 out_free_dgram:
1200         skb_free_datagram(sk, skb);
1201 out:
1202         return rc;
1203 }
1204
1205
1206 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1207 {
1208         struct sock *sk = sock->sk;
1209         struct x25_sock *x25 = x25_sk(sk);
1210         void __user *argp = (void __user *)arg;
1211         int rc;
1212
1213         switch (cmd) {
1214                 case TIOCOUTQ: {
1215                         int amount = sk->sk_sndbuf -
1216                                      atomic_read(&sk->sk_wmem_alloc);
1217                         if (amount < 0)
1218                                 amount = 0;
1219                         rc = put_user(amount, (unsigned int __user *)argp);
1220                         break;
1221                 }
1222
1223                 case TIOCINQ: {
1224                         struct sk_buff *skb;
1225                         int amount = 0;
1226                         /*
1227                          * These two are safe on a single CPU system as
1228                          * only user tasks fiddle here
1229                          */
1230                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1231                                 amount = skb->len;
1232                         rc = put_user(amount, (unsigned int __user *)argp);
1233                         break;
1234                 }
1235
1236                 case SIOCGSTAMP:
1237                         rc = -EINVAL;
1238                         if (sk)
1239                                 rc = sock_get_timestamp(sk, 
1240                                                 (struct timeval __user *)argp); 
1241                         break;
1242                 case SIOCGIFADDR:
1243                 case SIOCSIFADDR:
1244                 case SIOCGIFDSTADDR:
1245                 case SIOCSIFDSTADDR:
1246                 case SIOCGIFBRDADDR:
1247                 case SIOCSIFBRDADDR:
1248                 case SIOCGIFNETMASK:
1249                 case SIOCSIFNETMASK:
1250                 case SIOCGIFMETRIC:
1251                 case SIOCSIFMETRIC:
1252                         rc = -EINVAL;
1253                         break;
1254                 case SIOCADDRT:
1255                 case SIOCDELRT:
1256                         rc = -EPERM;
1257                         if (!capable(CAP_NET_ADMIN))
1258                                 break;
1259                         rc = x25_route_ioctl(cmd, argp);
1260                         break;
1261                 case SIOCX25GSUBSCRIP:
1262                         rc = x25_subscr_ioctl(cmd, argp);
1263                         break;
1264                 case SIOCX25SSUBSCRIP:
1265                         rc = -EPERM;
1266                         if (!capable(CAP_NET_ADMIN))
1267                                 break;
1268                         rc = x25_subscr_ioctl(cmd, argp);
1269                         break;
1270                 case SIOCX25GFACILITIES: {
1271                         struct x25_facilities fac = x25->facilities;
1272                         rc = copy_to_user(argp, &fac,
1273                                           sizeof(fac)) ? -EFAULT : 0;
1274                         break;
1275                 }
1276
1277                 case SIOCX25SFACILITIES: {
1278                         struct x25_facilities facilities;
1279                         rc = -EFAULT;
1280                         if (copy_from_user(&facilities, argp,
1281                                            sizeof(facilities)))
1282                                 break;
1283                         rc = -EINVAL;
1284                         if (sk->sk_state != TCP_LISTEN &&
1285                             sk->sk_state != TCP_CLOSE)
1286                                 break;
1287                         if (facilities.pacsize_in < X25_PS16 ||
1288                             facilities.pacsize_in > X25_PS4096)
1289                                 break;
1290                         if (facilities.pacsize_out < X25_PS16 ||
1291                             facilities.pacsize_out > X25_PS4096)
1292                                 break;
1293                         if (facilities.winsize_in < 1 ||
1294                             facilities.winsize_in > 127)
1295                                 break;
1296                         if (facilities.throughput < 0x03 ||
1297                             facilities.throughput > 0xDD)
1298                                 break;
1299                         if (facilities.reverse &&
1300                                 (facilities.reverse | 0x81)!= 0x81)
1301                                 break;
1302                         x25->facilities = facilities;
1303                         rc = 0;
1304                         break;
1305                 }
1306
1307                 case SIOCX25GCALLUSERDATA: {
1308                         struct x25_calluserdata cud = x25->calluserdata;
1309                         rc = copy_to_user(argp, &cud,
1310                                           sizeof(cud)) ? -EFAULT : 0;
1311                         break;
1312                 }
1313
1314                 case SIOCX25SCALLUSERDATA: {
1315                         struct x25_calluserdata calluserdata;
1316
1317                         rc = -EFAULT;
1318                         if (copy_from_user(&calluserdata, argp,
1319                                            sizeof(calluserdata)))
1320                                 break;
1321                         rc = -EINVAL;
1322                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1323                                 break;
1324                         x25->calluserdata = calluserdata;
1325                         rc = 0;
1326                         break;
1327                 }
1328
1329                 case SIOCX25GCAUSEDIAG: {
1330                         struct x25_causediag causediag;
1331                         causediag = x25->causediag;
1332                         rc = copy_to_user(argp, &causediag,
1333                                           sizeof(causediag)) ? -EFAULT : 0;
1334                         break;
1335                 }
1336
1337                 case SIOCX25SCUDMATCHLEN: {
1338                         struct x25_subaddr sub_addr;
1339                         rc = -EINVAL;
1340                         if(sk->sk_state != TCP_CLOSE)
1341                                 break;
1342                         rc = -EFAULT;
1343                         if (copy_from_user(&sub_addr, argp,
1344                                         sizeof(sub_addr)))
1345                                 break;
1346                         rc = -EINVAL;
1347                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1348                                 break;
1349                         x25->cudmatchlength = sub_addr.cudmatchlength;
1350                         rc = 0;
1351                         break;
1352                 }
1353
1354                 case SIOCX25CALLACCPTAPPRV: {
1355                         rc = -EINVAL;
1356                         if (sk->sk_state != TCP_CLOSE)
1357                                 break;
1358                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1359                         rc = 0;
1360                         break;
1361                 }
1362
1363                 case SIOCX25SENDCALLACCPT:  {
1364                         rc = -EINVAL;
1365                         if (sk->sk_state != TCP_ESTABLISHED)
1366                                 break;
1367                         if (x25->accptapprv)    /* must call accptapprv above */
1368                                 break;
1369                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1370                         x25->state = X25_STATE_3;
1371                         rc = 0;
1372                         break;
1373                 }
1374
1375                 default:
1376                         rc = -ENOIOCTLCMD;
1377                         break;
1378         }
1379
1380         return rc;
1381 }
1382
1383 static struct net_proto_family x25_family_ops = {
1384         .family =       AF_X25,
1385         .create =       x25_create,
1386         .owner  =       THIS_MODULE,
1387 };
1388
1389 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1390         .family =       AF_X25,
1391         .owner =        THIS_MODULE,
1392         .release =      x25_release,
1393         .bind =         x25_bind,
1394         .connect =      x25_connect,
1395         .socketpair =   sock_no_socketpair,
1396         .accept =       x25_accept,
1397         .getname =      x25_getname,
1398         .poll =         datagram_poll,
1399         .ioctl =        x25_ioctl,
1400         .listen =       x25_listen,
1401         .shutdown =     sock_no_shutdown,
1402         .setsockopt =   x25_setsockopt,
1403         .getsockopt =   x25_getsockopt,
1404         .sendmsg =      x25_sendmsg,
1405         .recvmsg =      x25_recvmsg,
1406         .mmap =         sock_no_mmap,
1407         .sendpage =     sock_no_sendpage,
1408 };
1409
1410 #include <linux/smp_lock.h>
1411 SOCKOPS_WRAP(x25_proto, AF_X25);
1412
1413 static struct packet_type x25_packet_type = {
1414         .type = __constant_htons(ETH_P_X25),
1415         .func = x25_lapb_receive_frame,
1416 };
1417
1418 static struct notifier_block x25_dev_notifier = {
1419         .notifier_call = x25_device_event,
1420 };
1421
1422 void x25_kill_by_neigh(struct x25_neigh *nb)
1423 {
1424         struct sock *s;
1425         struct hlist_node *node;
1426
1427         write_lock_bh(&x25_list_lock);
1428
1429         sk_for_each(s, node, &x25_list)
1430                 if (x25_sk(s)->neighbour == nb)
1431                         x25_disconnect(s, ENETUNREACH, 0, 0);
1432
1433         write_unlock_bh(&x25_list_lock);
1434 }
1435
1436 static int __init x25_init(void)
1437 {
1438         int rc = proto_register(&x25_proto, 0);
1439
1440         if (rc != 0)
1441                 goto out;
1442
1443         sock_register(&x25_family_ops);
1444
1445         dev_add_pack(&x25_packet_type);
1446
1447         register_netdevice_notifier(&x25_dev_notifier);
1448
1449         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1450
1451 #ifdef CONFIG_SYSCTL
1452         x25_register_sysctl();
1453 #endif
1454         x25_proc_init();
1455 out:
1456         return rc;
1457 }
1458 module_init(x25_init);
1459
1460 static void __exit x25_exit(void)
1461 {
1462         x25_proc_exit();
1463         x25_link_free();
1464         x25_route_free();
1465
1466 #ifdef CONFIG_SYSCTL
1467         x25_unregister_sysctl();
1468 #endif
1469
1470         unregister_netdevice_notifier(&x25_dev_notifier);
1471
1472         dev_remove_pack(&x25_packet_type);
1473
1474         sock_unregister(AF_X25);
1475         proto_unregister(&x25_proto);
1476 }
1477 module_exit(x25_exit);
1478
1479 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1480 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1481 MODULE_LICENSE("GPL");
1482 MODULE_ALIAS_NETPROTO(PF_X25);