net/x25: push BKL usage into x25_proto
[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/module.h>
39 #include <linux/capability.h>
40 #include <linux/errno.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/smp_lock.h>
44 #include <linux/timer.h>
45 #include <linux/string.h>
46 #include <linux/net.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_arp.h>
49 #include <linux/skbuff.h>
50 #include <net/sock.h>
51 #include <net/tcp_states.h>
52 #include <asm/uaccess.h>
53 #include <linux/fcntl.h>
54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
55 #include <linux/notifier.h>
56 #include <linux/init.h>
57 #include <linux/compat.h>
58
59 #include <net/x25.h>
60 #include <net/compat.h>
61
62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
63 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
64 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
65 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
66 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
67 int sysctl_x25_forward                 = 0;
68
69 HLIST_HEAD(x25_list);
70 DEFINE_RWLOCK(x25_list_lock);
71
72 static const struct proto_ops x25_proto_ops;
73
74 static struct x25_address null_x25_address = {"               "};
75
76 #ifdef CONFIG_COMPAT
77 struct compat_x25_subscrip_struct {
78         char device[200-sizeof(compat_ulong_t)];
79         compat_ulong_t global_facil_mask;
80         compat_uint_t extended;
81 };
82 #endif
83
84 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
85                   struct x25_address *calling_addr)
86 {
87         unsigned int called_len, calling_len;
88         char *called, *calling;
89         unsigned int i;
90
91         called_len  = (*p >> 0) & 0x0F;
92         calling_len = (*p >> 4) & 0x0F;
93
94         called  = called_addr->x25_addr;
95         calling = calling_addr->x25_addr;
96         p++;
97
98         for (i = 0; i < (called_len + calling_len); i++) {
99                 if (i < called_len) {
100                         if (i % 2 != 0) {
101                                 *called++ = ((*p >> 0) & 0x0F) + '0';
102                                 p++;
103                         } else {
104                                 *called++ = ((*p >> 4) & 0x0F) + '0';
105                         }
106                 } else {
107                         if (i % 2 != 0) {
108                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
109                                 p++;
110                         } else {
111                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
112                         }
113                 }
114         }
115
116         *called = *calling = '\0';
117
118         return 1 + (called_len + calling_len + 1) / 2;
119 }
120
121 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
122                   struct x25_address *calling_addr)
123 {
124         unsigned int called_len, calling_len;
125         char *called, *calling;
126         int i;
127
128         called  = called_addr->x25_addr;
129         calling = calling_addr->x25_addr;
130
131         called_len  = strlen(called);
132         calling_len = strlen(calling);
133
134         *p++ = (calling_len << 4) | (called_len << 0);
135
136         for (i = 0; i < (called_len + calling_len); i++) {
137                 if (i < called_len) {
138                         if (i % 2 != 0) {
139                                 *p |= (*called++ - '0') << 0;
140                                 p++;
141                         } else {
142                                 *p = 0x00;
143                                 *p |= (*called++ - '0') << 4;
144                         }
145                 } else {
146                         if (i % 2 != 0) {
147                                 *p |= (*calling++ - '0') << 0;
148                                 p++;
149                         } else {
150                                 *p = 0x00;
151                                 *p |= (*calling++ - '0') << 4;
152                         }
153                 }
154         }
155
156         return 1 + (called_len + calling_len + 1) / 2;
157 }
158
159 /*
160  *      Socket removal during an interrupt is now safe.
161  */
162 static void x25_remove_socket(struct sock *sk)
163 {
164         write_lock_bh(&x25_list_lock);
165         sk_del_node_init(sk);
166         write_unlock_bh(&x25_list_lock);
167 }
168
169 /*
170  *      Kill all bound sockets on a dropped device.
171  */
172 static void x25_kill_by_device(struct net_device *dev)
173 {
174         struct sock *s;
175         struct hlist_node *node;
176
177         write_lock_bh(&x25_list_lock);
178
179         sk_for_each(s, node, &x25_list)
180                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
181                         x25_disconnect(s, ENETUNREACH, 0, 0);
182
183         write_unlock_bh(&x25_list_lock);
184 }
185
186 /*
187  *      Handle device status changes.
188  */
189 static int x25_device_event(struct notifier_block *this, unsigned long event,
190                             void *ptr)
191 {
192         struct net_device *dev = ptr;
193         struct x25_neigh *nb;
194
195         if (!net_eq(dev_net(dev), &init_net))
196                 return NOTIFY_DONE;
197
198         if (dev->type == ARPHRD_X25
199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
200          || dev->type == ARPHRD_ETHER
201 #endif
202          ) {
203                 switch (event) {
204                         case NETDEV_UP:
205                                 x25_link_device_up(dev);
206                                 break;
207                         case NETDEV_GOING_DOWN:
208                                 nb = x25_get_neigh(dev);
209                                 if (nb) {
210                                         x25_terminate_link(nb);
211                                         x25_neigh_put(nb);
212                                 }
213                                 break;
214                         case NETDEV_DOWN:
215                                 x25_kill_by_device(dev);
216                                 x25_route_device_down(dev);
217                                 x25_link_device_down(dev);
218                                 break;
219                 }
220         }
221
222         return NOTIFY_DONE;
223 }
224
225 /*
226  *      Add a socket to the bound sockets list.
227  */
228 static void x25_insert_socket(struct sock *sk)
229 {
230         write_lock_bh(&x25_list_lock);
231         sk_add_node(sk, &x25_list);
232         write_unlock_bh(&x25_list_lock);
233 }
234
235 /*
236  *      Find a socket that wants to accept the Call Request we just
237  *      received. Check the full list for an address/cud match.
238  *      If no cuds match return the next_best thing, an address match.
239  *      Note: if a listening socket has cud set it must only get calls
240  *      with matching cud.
241  */
242 static struct sock *x25_find_listener(struct x25_address *addr,
243                                         struct sk_buff *skb)
244 {
245         struct sock *s;
246         struct sock *next_best;
247         struct hlist_node *node;
248
249         read_lock_bh(&x25_list_lock);
250         next_best = NULL;
251
252         sk_for_each(s, node, &x25_list)
253                 if ((!strcmp(addr->x25_addr,
254                         x25_sk(s)->source_addr.x25_addr) ||
255                                 !strcmp(addr->x25_addr,
256                                         null_x25_address.x25_addr)) &&
257                                         s->sk_state == TCP_LISTEN) {
258                         /*
259                          * Found a listening socket, now check the incoming
260                          * call user data vs this sockets call user data
261                          */
262                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
263                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
264                                         skb->data,
265                                         x25_sk(s)->cudmatchlength)) == 0) {
266                                         sock_hold(s);
267                                         goto found;
268                                  }
269                         } else
270                                 next_best = s;
271                 }
272         if (next_best) {
273                 s = next_best;
274                 sock_hold(s);
275                 goto found;
276         }
277         s = NULL;
278 found:
279         read_unlock_bh(&x25_list_lock);
280         return s;
281 }
282
283 /*
284  *      Find a connected X.25 socket given my LCI and neighbour.
285  */
286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
287 {
288         struct sock *s;
289         struct hlist_node *node;
290
291         sk_for_each(s, node, &x25_list)
292                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
293                         sock_hold(s);
294                         goto found;
295                 }
296         s = NULL;
297 found:
298         return s;
299 }
300
301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
302 {
303         struct sock *s;
304
305         read_lock_bh(&x25_list_lock);
306         s = __x25_find_socket(lci, nb);
307         read_unlock_bh(&x25_list_lock);
308         return s;
309 }
310
311 /*
312  *      Find a unique LCI for a given device.
313  */
314 static unsigned int x25_new_lci(struct x25_neigh *nb)
315 {
316         unsigned int lci = 1;
317         struct sock *sk;
318
319         read_lock_bh(&x25_list_lock);
320
321         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
322                 sock_put(sk);
323                 if (++lci == 4096) {
324                         lci = 0;
325                         break;
326                 }
327         }
328
329         read_unlock_bh(&x25_list_lock);
330         return lci;
331 }
332
333 /*
334  *      Deferred destroy.
335  */
336 static void __x25_destroy_socket(struct sock *);
337
338 /*
339  *      handler for deferred kills.
340  */
341 static void x25_destroy_timer(unsigned long data)
342 {
343         x25_destroy_socket_from_timer((struct sock *)data);
344 }
345
346 /*
347  *      This is called from user mode and the timers. Thus it protects itself
348  *      against interrupt users but doesn't worry about being called during
349  *      work. Once it is removed from the queue no interrupt or bottom half
350  *      will touch it and we are (fairly 8-) ) safe.
351  *      Not static as it's used by the timer
352  */
353 static void __x25_destroy_socket(struct sock *sk)
354 {
355         struct sk_buff *skb;
356
357         x25_stop_heartbeat(sk);
358         x25_stop_timer(sk);
359
360         x25_remove_socket(sk);
361         x25_clear_queues(sk);           /* Flush the queues */
362
363         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
364                 if (skb->sk != sk) {            /* A pending connection */
365                         /*
366                          * Queue the unaccepted socket for death
367                          */
368                         sock_set_flag(skb->sk, SOCK_DEAD);
369                         x25_start_heartbeat(skb->sk);
370                         x25_sk(skb->sk)->state = X25_STATE_0;
371                 }
372
373                 kfree_skb(skb);
374         }
375
376         if (sk_has_allocations(sk)) {
377                 /* Defer: outstanding buffers */
378                 sk->sk_timer.expires  = jiffies + 10 * HZ;
379                 sk->sk_timer.function = x25_destroy_timer;
380                 sk->sk_timer.data = (unsigned long)sk;
381                 add_timer(&sk->sk_timer);
382         } else {
383                 /* drop last reference so sock_put will free */
384                 __sock_put(sk);
385         }
386 }
387
388 void x25_destroy_socket_from_timer(struct sock *sk)
389 {
390         sock_hold(sk);
391         bh_lock_sock(sk);
392         __x25_destroy_socket(sk);
393         bh_unlock_sock(sk);
394         sock_put(sk);
395 }
396
397 static void x25_destroy_socket(struct sock *sk)
398 {
399         sock_hold(sk);
400         lock_sock(sk);
401         __x25_destroy_socket(sk);
402         release_sock(sk);
403         sock_put(sk);
404 }
405
406 /*
407  *      Handling for system calls applied via the various interfaces to a
408  *      X.25 socket object.
409  */
410
411 static int x25_setsockopt(struct socket *sock, int level, int optname,
412                           char __user *optval, unsigned int optlen)
413 {
414         int opt;
415         struct sock *sk = sock->sk;
416         int rc = -ENOPROTOOPT;
417
418         lock_kernel();
419         if (level != SOL_X25 || optname != X25_QBITINCL)
420                 goto out;
421
422         rc = -EINVAL;
423         if (optlen < sizeof(int))
424                 goto out;
425
426         rc = -EFAULT;
427         if (get_user(opt, (int __user *)optval))
428                 goto out;
429
430         x25_sk(sk)->qbitincl = !!opt;
431         rc = 0;
432 out:
433         unlock_kernel();
434         return rc;
435 }
436
437 static int x25_getsockopt(struct socket *sock, int level, int optname,
438                           char __user *optval, int __user *optlen)
439 {
440         struct sock *sk = sock->sk;
441         int val, len, rc = -ENOPROTOOPT;
442
443         lock_kernel();
444         if (level != SOL_X25 || optname != X25_QBITINCL)
445                 goto out;
446
447         rc = -EFAULT;
448         if (get_user(len, optlen))
449                 goto out;
450
451         len = min_t(unsigned int, len, sizeof(int));
452
453         rc = -EINVAL;
454         if (len < 0)
455                 goto out;
456
457         rc = -EFAULT;
458         if (put_user(len, optlen))
459                 goto out;
460
461         val = x25_sk(sk)->qbitincl;
462         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
463 out:
464         unlock_kernel();
465         return rc;
466 }
467
468 static int x25_listen(struct socket *sock, int backlog)
469 {
470         struct sock *sk = sock->sk;
471         int rc = -EOPNOTSUPP;
472
473         lock_kernel();
474         if (sk->sk_state != TCP_LISTEN) {
475                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
476                 sk->sk_max_ack_backlog = backlog;
477                 sk->sk_state           = TCP_LISTEN;
478                 rc = 0;
479         }
480         unlock_kernel();
481
482         return rc;
483 }
484
485 static struct proto x25_proto = {
486         .name     = "X25",
487         .owner    = THIS_MODULE,
488         .obj_size = sizeof(struct x25_sock),
489 };
490
491 static struct sock *x25_alloc_socket(struct net *net)
492 {
493         struct x25_sock *x25;
494         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
495
496         if (!sk)
497                 goto out;
498
499         sock_init_data(NULL, sk);
500
501         x25 = x25_sk(sk);
502         skb_queue_head_init(&x25->ack_queue);
503         skb_queue_head_init(&x25->fragment_queue);
504         skb_queue_head_init(&x25->interrupt_in_queue);
505         skb_queue_head_init(&x25->interrupt_out_queue);
506 out:
507         return sk;
508 }
509
510 static int x25_create(struct net *net, struct socket *sock, int protocol,
511                       int kern)
512 {
513         struct sock *sk;
514         struct x25_sock *x25;
515         int rc = -ESOCKTNOSUPPORT;
516
517         if (net != &init_net)
518                 return -EAFNOSUPPORT;
519
520         if (sock->type != SOCK_SEQPACKET || protocol)
521                 goto out;
522
523         rc = -ENOMEM;
524         if ((sk = x25_alloc_socket(net)) == NULL)
525                 goto out;
526
527         x25 = x25_sk(sk);
528
529         sock_init_data(sock, sk);
530
531         x25_init_timers(sk);
532
533         sock->ops    = &x25_proto_ops;
534         sk->sk_protocol = protocol;
535         sk->sk_backlog_rcv = x25_backlog_rcv;
536
537         x25->t21   = sysctl_x25_call_request_timeout;
538         x25->t22   = sysctl_x25_reset_request_timeout;
539         x25->t23   = sysctl_x25_clear_request_timeout;
540         x25->t2    = sysctl_x25_ack_holdback_timeout;
541         x25->state = X25_STATE_0;
542         x25->cudmatchlength = 0;
543         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
544                                                         /* on call accept   */
545
546         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
547         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
548         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
549         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
550         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
551         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
552         x25->dte_facilities.calling_len = 0;
553         x25->dte_facilities.called_len = 0;
554         memset(x25->dte_facilities.called_ae, '\0',
555                         sizeof(x25->dte_facilities.called_ae));
556         memset(x25->dte_facilities.calling_ae, '\0',
557                         sizeof(x25->dte_facilities.calling_ae));
558
559         rc = 0;
560 out:
561         return rc;
562 }
563
564 static struct sock *x25_make_new(struct sock *osk)
565 {
566         struct sock *sk = NULL;
567         struct x25_sock *x25, *ox25;
568
569         if (osk->sk_type != SOCK_SEQPACKET)
570                 goto out;
571
572         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
573                 goto out;
574
575         x25 = x25_sk(sk);
576
577         sk->sk_type        = osk->sk_type;
578         sk->sk_priority    = osk->sk_priority;
579         sk->sk_protocol    = osk->sk_protocol;
580         sk->sk_rcvbuf      = osk->sk_rcvbuf;
581         sk->sk_sndbuf      = osk->sk_sndbuf;
582         sk->sk_state       = TCP_ESTABLISHED;
583         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
584         sock_copy_flags(sk, osk);
585
586         ox25 = x25_sk(osk);
587         x25->t21        = ox25->t21;
588         x25->t22        = ox25->t22;
589         x25->t23        = ox25->t23;
590         x25->t2         = ox25->t2;
591         x25->facilities = ox25->facilities;
592         x25->qbitincl   = ox25->qbitincl;
593         x25->dte_facilities = ox25->dte_facilities;
594         x25->cudmatchlength = ox25->cudmatchlength;
595         x25->accptapprv = ox25->accptapprv;
596
597         x25_init_timers(sk);
598 out:
599         return sk;
600 }
601
602 static int x25_release(struct socket *sock)
603 {
604         struct sock *sk = sock->sk;
605         struct x25_sock *x25;
606
607         lock_kernel();
608         if (!sk)
609                 goto out;
610
611         x25 = x25_sk(sk);
612
613         switch (x25->state) {
614
615                 case X25_STATE_0:
616                 case X25_STATE_2:
617                         x25_disconnect(sk, 0, 0, 0);
618                         x25_destroy_socket(sk);
619                         goto out;
620
621                 case X25_STATE_1:
622                 case X25_STATE_3:
623                 case X25_STATE_4:
624                         x25_clear_queues(sk);
625                         x25_write_internal(sk, X25_CLEAR_REQUEST);
626                         x25_start_t23timer(sk);
627                         x25->state = X25_STATE_2;
628                         sk->sk_state    = TCP_CLOSE;
629                         sk->sk_shutdown |= SEND_SHUTDOWN;
630                         sk->sk_state_change(sk);
631                         sock_set_flag(sk, SOCK_DEAD);
632                         sock_set_flag(sk, SOCK_DESTROY);
633                         break;
634         }
635
636         sock_orphan(sk);
637 out:
638         unlock_kernel();
639         return 0;
640 }
641
642 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
643 {
644         struct sock *sk = sock->sk;
645         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
646         int rc = 0;
647
648         lock_kernel();
649         if (!sock_flag(sk, SOCK_ZAPPED) ||
650             addr_len != sizeof(struct sockaddr_x25) ||
651             addr->sx25_family != AF_X25) {
652                 rc = -EINVAL;
653                 goto out;
654         }
655
656         x25_sk(sk)->source_addr = addr->sx25_addr;
657         x25_insert_socket(sk);
658         sock_reset_flag(sk, SOCK_ZAPPED);
659         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
660 out:
661         unlock_kernel();
662         return rc;
663 }
664
665 static int x25_wait_for_connection_establishment(struct sock *sk)
666 {
667         DECLARE_WAITQUEUE(wait, current);
668         int rc;
669
670         add_wait_queue_exclusive(sk->sk_sleep, &wait);
671         for (;;) {
672                 __set_current_state(TASK_INTERRUPTIBLE);
673                 rc = -ERESTARTSYS;
674                 if (signal_pending(current))
675                         break;
676                 rc = sock_error(sk);
677                 if (rc) {
678                         sk->sk_socket->state = SS_UNCONNECTED;
679                         break;
680                 }
681                 rc = 0;
682                 if (sk->sk_state != TCP_ESTABLISHED) {
683                         release_sock(sk);
684                         schedule();
685                         lock_sock(sk);
686                 } else
687                         break;
688         }
689         __set_current_state(TASK_RUNNING);
690         remove_wait_queue(sk->sk_sleep, &wait);
691         return rc;
692 }
693
694 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
695                        int addr_len, int flags)
696 {
697         struct sock *sk = sock->sk;
698         struct x25_sock *x25 = x25_sk(sk);
699         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
700         struct x25_route *rt;
701         int rc = 0;
702
703         lock_kernel();
704         lock_sock(sk);
705         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
706                 sock->state = SS_CONNECTED;
707                 goto out; /* Connect completed during a ERESTARTSYS event */
708         }
709
710         rc = -ECONNREFUSED;
711         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
712                 sock->state = SS_UNCONNECTED;
713                 goto out;
714         }
715
716         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
717         if (sk->sk_state == TCP_ESTABLISHED)
718                 goto out;
719
720         sk->sk_state   = TCP_CLOSE;
721         sock->state = SS_UNCONNECTED;
722
723         rc = -EINVAL;
724         if (addr_len != sizeof(struct sockaddr_x25) ||
725             addr->sx25_family != AF_X25)
726                 goto out;
727
728         rc = -ENETUNREACH;
729         rt = x25_get_route(&addr->sx25_addr);
730         if (!rt)
731                 goto out;
732
733         x25->neighbour = x25_get_neigh(rt->dev);
734         if (!x25->neighbour)
735                 goto out_put_route;
736
737         x25_limit_facilities(&x25->facilities, x25->neighbour);
738
739         x25->lci = x25_new_lci(x25->neighbour);
740         if (!x25->lci)
741                 goto out_put_neigh;
742
743         rc = -EINVAL;
744         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
745                 goto out_put_neigh;
746
747         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
748                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
749
750         x25->dest_addr = addr->sx25_addr;
751
752         /* Move to connecting socket, start sending Connect Requests */
753         sock->state   = SS_CONNECTING;
754         sk->sk_state  = TCP_SYN_SENT;
755
756         x25->state = X25_STATE_1;
757
758         x25_write_internal(sk, X25_CALL_REQUEST);
759
760         x25_start_heartbeat(sk);
761         x25_start_t21timer(sk);
762
763         /* Now the loop */
764         rc = -EINPROGRESS;
765         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
766                 goto out_put_neigh;
767
768         rc = x25_wait_for_connection_establishment(sk);
769         if (rc)
770                 goto out_put_neigh;
771
772         sock->state = SS_CONNECTED;
773         rc = 0;
774 out_put_neigh:
775         if (rc)
776                 x25_neigh_put(x25->neighbour);
777 out_put_route:
778         x25_route_put(rt);
779 out:
780         release_sock(sk);
781         unlock_kernel();
782         return rc;
783 }
784
785 static int x25_wait_for_data(struct sock *sk, long timeout)
786 {
787         DECLARE_WAITQUEUE(wait, current);
788         int rc = 0;
789
790         add_wait_queue_exclusive(sk->sk_sleep, &wait);
791         for (;;) {
792                 __set_current_state(TASK_INTERRUPTIBLE);
793                 if (sk->sk_shutdown & RCV_SHUTDOWN)
794                         break;
795                 rc = -ERESTARTSYS;
796                 if (signal_pending(current))
797                         break;
798                 rc = -EAGAIN;
799                 if (!timeout)
800                         break;
801                 rc = 0;
802                 if (skb_queue_empty(&sk->sk_receive_queue)) {
803                         release_sock(sk);
804                         timeout = schedule_timeout(timeout);
805                         lock_sock(sk);
806                 } else
807                         break;
808         }
809         __set_current_state(TASK_RUNNING);
810         remove_wait_queue(sk->sk_sleep, &wait);
811         return rc;
812 }
813
814 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
815 {
816         struct sock *sk = sock->sk;
817         struct sock *newsk;
818         struct sk_buff *skb;
819         int rc = -EINVAL;
820
821         lock_kernel();
822         if (!sk || sk->sk_state != TCP_LISTEN)
823                 goto out;
824
825         rc = -EOPNOTSUPP;
826         if (sk->sk_type != SOCK_SEQPACKET)
827                 goto out;
828
829         lock_sock(sk);
830         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
831         if (rc)
832                 goto out2;
833         skb = skb_dequeue(&sk->sk_receive_queue);
834         rc = -EINVAL;
835         if (!skb->sk)
836                 goto out2;
837         newsk            = skb->sk;
838         sock_graft(newsk, newsock);
839
840         /* Now attach up the new socket */
841         skb->sk = NULL;
842         kfree_skb(skb);
843         sk->sk_ack_backlog--;
844         newsock->state = SS_CONNECTED;
845         rc = 0;
846 out2:
847         release_sock(sk);
848 out:
849         unlock_kernel();
850         return rc;
851 }
852
853 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
854                        int *uaddr_len, int peer)
855 {
856         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
857         struct sock *sk = sock->sk;
858         struct x25_sock *x25 = x25_sk(sk);
859         int rc = 0;
860
861         lock_kernel();
862         if (peer) {
863                 if (sk->sk_state != TCP_ESTABLISHED) {
864                         rc = -ENOTCONN;
865                         goto out;
866                 }
867                 sx25->sx25_addr = x25->dest_addr;
868         } else
869                 sx25->sx25_addr = x25->source_addr;
870
871         sx25->sx25_family = AF_X25;
872         *uaddr_len = sizeof(*sx25);
873
874 out:
875         unlock_kernel();
876         return rc;
877 }
878
879 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
880                            poll_table *wait)
881 {
882         int rc;
883
884         lock_kernel();
885         rc = datagram_poll(file, sock, wait);
886         unlock_kernel();
887
888         return rc;
889 }
890
891 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
892                         unsigned int lci)
893 {
894         struct sock *sk;
895         struct sock *make;
896         struct x25_sock *makex25;
897         struct x25_address source_addr, dest_addr;
898         struct x25_facilities facilities;
899         struct x25_dte_facilities dte_facilities;
900         int len, addr_len, rc;
901
902         /*
903          *      Remove the LCI and frame type.
904          */
905         skb_pull(skb, X25_STD_MIN_LEN);
906
907         /*
908          *      Extract the X.25 addresses and convert them to ASCII strings,
909          *      and remove them.
910          */
911         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
912         skb_pull(skb, addr_len);
913
914         /*
915          *      Get the length of the facilities, skip past them for the moment
916          *      get the call user data because this is needed to determine
917          *      the correct listener
918          */
919         len = skb->data[0] + 1;
920         skb_pull(skb,len);
921
922         /*
923          *      Find a listener for the particular address/cud pair.
924          */
925         sk = x25_find_listener(&source_addr,skb);
926         skb_push(skb,len);
927
928         if (sk != NULL && sk_acceptq_is_full(sk)) {
929                 goto out_sock_put;
930         }
931
932         /*
933          *      We dont have any listeners for this incoming call.
934          *      Try forwarding it.
935          */
936         if (sk == NULL) {
937                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
938                 if (sysctl_x25_forward &&
939                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
940                 {
941                         /* Call was forwarded, dont process it any more */
942                         kfree_skb(skb);
943                         rc = 1;
944                         goto out;
945                 } else {
946                         /* No listeners, can't forward, clear the call */
947                         goto out_clear_request;
948                 }
949         }
950
951         /*
952          *      Try to reach a compromise on the requested facilities.
953          */
954         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
955         if (len == -1)
956                 goto out_sock_put;
957
958         /*
959          * current neighbour/link might impose additional limits
960          * on certain facilties
961          */
962
963         x25_limit_facilities(&facilities, nb);
964
965         /*
966          *      Try to create a new socket.
967          */
968         make = x25_make_new(sk);
969         if (!make)
970                 goto out_sock_put;
971
972         /*
973          *      Remove the facilities
974          */
975         skb_pull(skb, len);
976
977         skb->sk     = make;
978         make->sk_state = TCP_ESTABLISHED;
979
980         makex25 = x25_sk(make);
981         makex25->lci           = lci;
982         makex25->dest_addr     = dest_addr;
983         makex25->source_addr   = source_addr;
984         makex25->neighbour     = nb;
985         makex25->facilities    = facilities;
986         makex25->dte_facilities= dte_facilities;
987         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
988         /* ensure no reverse facil on accept */
989         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
990         /* ensure no calling address extension on accept */
991         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
992         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
993
994         /* Normally all calls are accepted immediatly */
995         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
996                 x25_write_internal(make, X25_CALL_ACCEPTED);
997                 makex25->state = X25_STATE_3;
998         }
999
1000         /*
1001          *      Incoming Call User Data.
1002          */
1003         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1004         makex25->calluserdata.cudlength = skb->len;
1005
1006         sk->sk_ack_backlog++;
1007
1008         x25_insert_socket(make);
1009
1010         skb_queue_head(&sk->sk_receive_queue, skb);
1011
1012         x25_start_heartbeat(make);
1013
1014         if (!sock_flag(sk, SOCK_DEAD))
1015                 sk->sk_data_ready(sk, skb->len);
1016         rc = 1;
1017         sock_put(sk);
1018 out:
1019         return rc;
1020 out_sock_put:
1021         sock_put(sk);
1022 out_clear_request:
1023         rc = 0;
1024         x25_transmit_clear_request(nb, lci, 0x01);
1025         goto out;
1026 }
1027
1028 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1029                        struct msghdr *msg, size_t len)
1030 {
1031         struct sock *sk = sock->sk;
1032         struct x25_sock *x25 = x25_sk(sk);
1033         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1034         struct sockaddr_x25 sx25;
1035         struct sk_buff *skb;
1036         unsigned char *asmptr;
1037         int noblock = msg->msg_flags & MSG_DONTWAIT;
1038         size_t size;
1039         int qbit = 0, rc = -EINVAL;
1040
1041         lock_kernel();
1042         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1043                 goto out;
1044
1045         /* we currently don't support segmented records at the user interface */
1046         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1047                 goto out;
1048
1049         rc = -EADDRNOTAVAIL;
1050         if (sock_flag(sk, SOCK_ZAPPED))
1051                 goto out;
1052
1053         rc = -EPIPE;
1054         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1055                 send_sig(SIGPIPE, current, 0);
1056                 goto out;
1057         }
1058
1059         rc = -ENETUNREACH;
1060         if (!x25->neighbour)
1061                 goto out;
1062
1063         if (usx25) {
1064                 rc = -EINVAL;
1065                 if (msg->msg_namelen < sizeof(sx25))
1066                         goto out;
1067                 memcpy(&sx25, usx25, sizeof(sx25));
1068                 rc = -EISCONN;
1069                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1070                         goto out;
1071                 rc = -EINVAL;
1072                 if (sx25.sx25_family != AF_X25)
1073                         goto out;
1074         } else {
1075                 /*
1076                  *      FIXME 1003.1g - if the socket is like this because
1077                  *      it has become closed (not started closed) we ought
1078                  *      to SIGPIPE, EPIPE;
1079                  */
1080                 rc = -ENOTCONN;
1081                 if (sk->sk_state != TCP_ESTABLISHED)
1082                         goto out;
1083
1084                 sx25.sx25_family = AF_X25;
1085                 sx25.sx25_addr   = x25->dest_addr;
1086         }
1087
1088         /* Sanity check the packet size */
1089         if (len > 65535) {
1090                 rc = -EMSGSIZE;
1091                 goto out;
1092         }
1093
1094         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1095
1096         /* Build a packet */
1097         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1098
1099         if ((msg->msg_flags & MSG_OOB) && len > 32)
1100                 len = 32;
1101
1102         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1103
1104         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1105         if (!skb)
1106                 goto out;
1107         X25_SKB_CB(skb)->flags = msg->msg_flags;
1108
1109         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1110
1111         /*
1112          *      Put the data on the end
1113          */
1114         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1115
1116         skb_reset_transport_header(skb);
1117         skb_put(skb, len);
1118
1119         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1120         if (rc)
1121                 goto out_kfree_skb;
1122
1123         /*
1124          *      If the Q BIT Include socket option is in force, the first
1125          *      byte of the user data is the logical value of the Q Bit.
1126          */
1127         if (x25->qbitincl) {
1128                 qbit = skb->data[0];
1129                 skb_pull(skb, 1);
1130         }
1131
1132         /*
1133          *      Push down the X.25 header
1134          */
1135         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1136
1137         if (msg->msg_flags & MSG_OOB) {
1138                 if (x25->neighbour->extended) {
1139                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1140                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1141                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1142                         *asmptr++ = X25_INTERRUPT;
1143                 } else {
1144                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1145                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1146                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1147                         *asmptr++ = X25_INTERRUPT;
1148                 }
1149         } else {
1150                 if (x25->neighbour->extended) {
1151                         /* Build an Extended X.25 header */
1152                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1153                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1154                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1155                         *asmptr++ = X25_DATA;
1156                         *asmptr++ = X25_DATA;
1157                 } else {
1158                         /* Build an Standard X.25 header */
1159                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1160                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1161                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1162                         *asmptr++ = X25_DATA;
1163                 }
1164
1165                 if (qbit)
1166                         skb->data[0] |= X25_Q_BIT;
1167         }
1168
1169         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1170         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1171
1172         rc = -ENOTCONN;
1173         if (sk->sk_state != TCP_ESTABLISHED)
1174                 goto out_kfree_skb;
1175
1176         if (msg->msg_flags & MSG_OOB)
1177                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1178         else {
1179                 rc = x25_output(sk, skb);
1180                 len = rc;
1181                 if (rc < 0)
1182                         kfree_skb(skb);
1183                 else if (x25->qbitincl)
1184                         len++;
1185         }
1186
1187         /*
1188          * lock_sock() is currently only used to serialize this x25_kick()
1189          * against input-driven x25_kick() calls. It currently only blocks
1190          * incoming packets for this socket and does not protect against
1191          * any other socket state changes and is not called from anywhere
1192          * else. As x25_kick() cannot block and as long as all socket
1193          * operations are BKL-wrapped, we don't need take to care about
1194          * purging the backlog queue in x25_release().
1195          *
1196          * Using lock_sock() to protect all socket operations entirely
1197          * (and making the whole x25 stack SMP aware) unfortunately would
1198          * require major changes to {send,recv}msg and skb allocation methods.
1199          * -> 2.5 ;)
1200          */
1201         lock_sock(sk);
1202         x25_kick(sk);
1203         release_sock(sk);
1204         rc = len;
1205 out:
1206         unlock_kernel();
1207         return rc;
1208 out_kfree_skb:
1209         kfree_skb(skb);
1210         goto out;
1211 }
1212
1213
1214 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1215                        struct msghdr *msg, size_t size,
1216                        int flags)
1217 {
1218         struct sock *sk = sock->sk;
1219         struct x25_sock *x25 = x25_sk(sk);
1220         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1221         size_t copied;
1222         int qbit;
1223         struct sk_buff *skb;
1224         unsigned char *asmptr;
1225         int rc = -ENOTCONN;
1226
1227         lock_kernel();
1228         /*
1229          * This works for seqpacket too. The receiver has ordered the queue for
1230          * us! We do one quick check first though
1231          */
1232         if (sk->sk_state != TCP_ESTABLISHED)
1233                 goto out;
1234
1235         if (flags & MSG_OOB) {
1236                 rc = -EINVAL;
1237                 if (sock_flag(sk, SOCK_URGINLINE) ||
1238                     !skb_peek(&x25->interrupt_in_queue))
1239                         goto out;
1240
1241                 skb = skb_dequeue(&x25->interrupt_in_queue);
1242
1243                 skb_pull(skb, X25_STD_MIN_LEN);
1244
1245                 /*
1246                  *      No Q bit information on Interrupt data.
1247                  */
1248                 if (x25->qbitincl) {
1249                         asmptr  = skb_push(skb, 1);
1250                         *asmptr = 0x00;
1251                 }
1252
1253                 msg->msg_flags |= MSG_OOB;
1254         } else {
1255                 /* Now we can treat all alike */
1256                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1257                                         flags & MSG_DONTWAIT, &rc);
1258                 if (!skb)
1259                         goto out;
1260
1261                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1262
1263                 skb_pull(skb, x25->neighbour->extended ?
1264                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1265
1266                 if (x25->qbitincl) {
1267                         asmptr  = skb_push(skb, 1);
1268                         *asmptr = qbit;
1269                 }
1270         }
1271
1272         skb_reset_transport_header(skb);
1273         copied = skb->len;
1274
1275         if (copied > size) {
1276                 copied = size;
1277                 msg->msg_flags |= MSG_TRUNC;
1278         }
1279
1280         /* Currently, each datagram always contains a complete record */
1281         msg->msg_flags |= MSG_EOR;
1282
1283         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1284         if (rc)
1285                 goto out_free_dgram;
1286
1287         if (sx25) {
1288                 sx25->sx25_family = AF_X25;
1289                 sx25->sx25_addr   = x25->dest_addr;
1290         }
1291
1292         msg->msg_namelen = sizeof(struct sockaddr_x25);
1293
1294         lock_sock(sk);
1295         x25_check_rbuf(sk);
1296         release_sock(sk);
1297         rc = copied;
1298 out_free_dgram:
1299         skb_free_datagram(sk, skb);
1300 out:
1301         unlock_kernel();
1302         return rc;
1303 }
1304
1305
1306 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1307 {
1308         struct sock *sk = sock->sk;
1309         struct x25_sock *x25 = x25_sk(sk);
1310         void __user *argp = (void __user *)arg;
1311         int rc;
1312
1313         lock_kernel();
1314         switch (cmd) {
1315                 case TIOCOUTQ: {
1316                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1317
1318                         if (amount < 0)
1319                                 amount = 0;
1320                         rc = put_user(amount, (unsigned int __user *)argp);
1321                         break;
1322                 }
1323
1324                 case TIOCINQ: {
1325                         struct sk_buff *skb;
1326                         int amount = 0;
1327                         /*
1328                          * These two are safe on a single CPU system as
1329                          * only user tasks fiddle here
1330                          */
1331                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1332                                 amount = skb->len;
1333                         rc = put_user(amount, (unsigned int __user *)argp);
1334                         break;
1335                 }
1336
1337                 case SIOCGSTAMP:
1338                         rc = -EINVAL;
1339                         if (sk)
1340                                 rc = sock_get_timestamp(sk,
1341                                                 (struct timeval __user *)argp);
1342                         break;
1343                 case SIOCGSTAMPNS:
1344                         rc = -EINVAL;
1345                         if (sk)
1346                                 rc = sock_get_timestampns(sk,
1347                                                 (struct timespec __user *)argp);
1348                         break;
1349                 case SIOCGIFADDR:
1350                 case SIOCSIFADDR:
1351                 case SIOCGIFDSTADDR:
1352                 case SIOCSIFDSTADDR:
1353                 case SIOCGIFBRDADDR:
1354                 case SIOCSIFBRDADDR:
1355                 case SIOCGIFNETMASK:
1356                 case SIOCSIFNETMASK:
1357                 case SIOCGIFMETRIC:
1358                 case SIOCSIFMETRIC:
1359                         rc = -EINVAL;
1360                         break;
1361                 case SIOCADDRT:
1362                 case SIOCDELRT:
1363                         rc = -EPERM;
1364                         if (!capable(CAP_NET_ADMIN))
1365                                 break;
1366                         rc = x25_route_ioctl(cmd, argp);
1367                         break;
1368                 case SIOCX25GSUBSCRIP:
1369                         rc = x25_subscr_ioctl(cmd, argp);
1370                         break;
1371                 case SIOCX25SSUBSCRIP:
1372                         rc = -EPERM;
1373                         if (!capable(CAP_NET_ADMIN))
1374                                 break;
1375                         rc = x25_subscr_ioctl(cmd, argp);
1376                         break;
1377                 case SIOCX25GFACILITIES: {
1378                         struct x25_facilities fac = x25->facilities;
1379                         rc = copy_to_user(argp, &fac,
1380                                           sizeof(fac)) ? -EFAULT : 0;
1381                         break;
1382                 }
1383
1384                 case SIOCX25SFACILITIES: {
1385                         struct x25_facilities facilities;
1386                         rc = -EFAULT;
1387                         if (copy_from_user(&facilities, argp,
1388                                            sizeof(facilities)))
1389                                 break;
1390                         rc = -EINVAL;
1391                         if (sk->sk_state != TCP_LISTEN &&
1392                             sk->sk_state != TCP_CLOSE)
1393                                 break;
1394                         if (facilities.pacsize_in < X25_PS16 ||
1395                             facilities.pacsize_in > X25_PS4096)
1396                                 break;
1397                         if (facilities.pacsize_out < X25_PS16 ||
1398                             facilities.pacsize_out > X25_PS4096)
1399                                 break;
1400                         if (facilities.winsize_in < 1 ||
1401                             facilities.winsize_in > 127)
1402                                 break;
1403                         if (facilities.throughput < 0x03 ||
1404                             facilities.throughput > 0xDD)
1405                                 break;
1406                         if (facilities.reverse &&
1407                                 (facilities.reverse & 0x81) != 0x81)
1408                                 break;
1409                         x25->facilities = facilities;
1410                         rc = 0;
1411                         break;
1412                 }
1413
1414                 case SIOCX25GDTEFACILITIES: {
1415                         rc = copy_to_user(argp, &x25->dte_facilities,
1416                                                 sizeof(x25->dte_facilities));
1417                         if (rc)
1418                                 rc = -EFAULT;
1419                         break;
1420                 }
1421
1422                 case SIOCX25SDTEFACILITIES: {
1423                         struct x25_dte_facilities dtefacs;
1424                         rc = -EFAULT;
1425                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1426                                 break;
1427                         rc = -EINVAL;
1428                         if (sk->sk_state != TCP_LISTEN &&
1429                                         sk->sk_state != TCP_CLOSE)
1430                                 break;
1431                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1432                                 break;
1433                         if (dtefacs.calling_ae == NULL)
1434                                 break;
1435                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1436                                 break;
1437                         if (dtefacs.called_ae == NULL)
1438                                 break;
1439                         x25->dte_facilities = dtefacs;
1440                         rc = 0;
1441                         break;
1442                 }
1443
1444                 case SIOCX25GCALLUSERDATA: {
1445                         struct x25_calluserdata cud = x25->calluserdata;
1446                         rc = copy_to_user(argp, &cud,
1447                                           sizeof(cud)) ? -EFAULT : 0;
1448                         break;
1449                 }
1450
1451                 case SIOCX25SCALLUSERDATA: {
1452                         struct x25_calluserdata calluserdata;
1453
1454                         rc = -EFAULT;
1455                         if (copy_from_user(&calluserdata, argp,
1456                                            sizeof(calluserdata)))
1457                                 break;
1458                         rc = -EINVAL;
1459                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1460                                 break;
1461                         x25->calluserdata = calluserdata;
1462                         rc = 0;
1463                         break;
1464                 }
1465
1466                 case SIOCX25GCAUSEDIAG: {
1467                         struct x25_causediag causediag;
1468                         causediag = x25->causediag;
1469                         rc = copy_to_user(argp, &causediag,
1470                                           sizeof(causediag)) ? -EFAULT : 0;
1471                         break;
1472                 }
1473
1474                 case SIOCX25SCUDMATCHLEN: {
1475                         struct x25_subaddr sub_addr;
1476                         rc = -EINVAL;
1477                         if(sk->sk_state != TCP_CLOSE)
1478                                 break;
1479                         rc = -EFAULT;
1480                         if (copy_from_user(&sub_addr, argp,
1481                                         sizeof(sub_addr)))
1482                                 break;
1483                         rc = -EINVAL;
1484                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1485                                 break;
1486                         x25->cudmatchlength = sub_addr.cudmatchlength;
1487                         rc = 0;
1488                         break;
1489                 }
1490
1491                 case SIOCX25CALLACCPTAPPRV: {
1492                         rc = -EINVAL;
1493                         if (sk->sk_state != TCP_CLOSE)
1494                                 break;
1495                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1496                         rc = 0;
1497                         break;
1498                 }
1499
1500                 case SIOCX25SENDCALLACCPT:  {
1501                         rc = -EINVAL;
1502                         if (sk->sk_state != TCP_ESTABLISHED)
1503                                 break;
1504                         if (x25->accptapprv)    /* must call accptapprv above */
1505                                 break;
1506                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1507                         x25->state = X25_STATE_3;
1508                         rc = 0;
1509                         break;
1510                 }
1511
1512                 default:
1513                         rc = -ENOIOCTLCMD;
1514                         break;
1515         }
1516         unlock_kernel();
1517
1518         return rc;
1519 }
1520
1521 static const struct net_proto_family x25_family_ops = {
1522         .family =       AF_X25,
1523         .create =       x25_create,
1524         .owner  =       THIS_MODULE,
1525 };
1526
1527 #ifdef CONFIG_COMPAT
1528 static int compat_x25_subscr_ioctl(unsigned int cmd,
1529                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1530 {
1531         struct compat_x25_subscrip_struct x25_subscr;
1532         struct x25_neigh *nb;
1533         struct net_device *dev;
1534         int rc = -EINVAL;
1535
1536         rc = -EFAULT;
1537         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1538                 goto out;
1539
1540         rc = -EINVAL;
1541         dev = x25_dev_get(x25_subscr.device);
1542         if (dev == NULL)
1543                 goto out;
1544
1545         nb = x25_get_neigh(dev);
1546         if (nb == NULL)
1547                 goto out_dev_put;
1548
1549         dev_put(dev);
1550
1551         if (cmd == SIOCX25GSUBSCRIP) {
1552                 x25_subscr.extended = nb->extended;
1553                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1554                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1555                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1556         } else {
1557                 rc = -EINVAL;
1558                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1559                         rc = 0;
1560                         nb->extended = x25_subscr.extended;
1561                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1562                 }
1563         }
1564         x25_neigh_put(nb);
1565 out:
1566         return rc;
1567 out_dev_put:
1568         dev_put(dev);
1569         goto out;
1570 }
1571
1572 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1573                                 unsigned long arg)
1574 {
1575         void __user *argp = compat_ptr(arg);
1576         struct sock *sk = sock->sk;
1577
1578         int rc = -ENOIOCTLCMD;
1579
1580         switch(cmd) {
1581         case TIOCOUTQ:
1582         case TIOCINQ:
1583                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1584                 break;
1585         case SIOCGSTAMP:
1586                 rc = -EINVAL;
1587                 lock_kernel();
1588                 if (sk)
1589                         rc = compat_sock_get_timestamp(sk,
1590                                         (struct timeval __user*)argp);
1591                 unlock_kernel();
1592                 break;
1593         case SIOCGSTAMPNS:
1594                 rc = -EINVAL;
1595                 lock_kernel();
1596                 if (sk)
1597                         rc = compat_sock_get_timestampns(sk,
1598                                         (struct timespec __user*)argp);
1599                 unlock_kernel();
1600                 break;
1601         case SIOCGIFADDR:
1602         case SIOCSIFADDR:
1603         case SIOCGIFDSTADDR:
1604         case SIOCSIFDSTADDR:
1605         case SIOCGIFBRDADDR:
1606         case SIOCSIFBRDADDR:
1607         case SIOCGIFNETMASK:
1608         case SIOCSIFNETMASK:
1609         case SIOCGIFMETRIC:
1610         case SIOCSIFMETRIC:
1611                 rc = -EINVAL;
1612                 break;
1613         case SIOCADDRT:
1614         case SIOCDELRT:
1615                 rc = -EPERM;
1616                 if (!capable(CAP_NET_ADMIN))
1617                         break;
1618                 lock_kernel();
1619                 rc = x25_route_ioctl(cmd, argp);
1620                 unlock_kernel();
1621                 break;
1622         case SIOCX25GSUBSCRIP:
1623                 lock_kernel();
1624                 rc = compat_x25_subscr_ioctl(cmd, argp);
1625                 unlock_kernel();
1626                 break;
1627         case SIOCX25SSUBSCRIP:
1628                 rc = -EPERM;
1629                 if (!capable(CAP_NET_ADMIN))
1630                         break;
1631                 lock_kernel();
1632                 rc = compat_x25_subscr_ioctl(cmd, argp);
1633                 unlock_kernel();
1634                 break;
1635         case SIOCX25GFACILITIES:
1636         case SIOCX25SFACILITIES:
1637         case SIOCX25GDTEFACILITIES:
1638         case SIOCX25SDTEFACILITIES:
1639         case SIOCX25GCALLUSERDATA:
1640         case SIOCX25SCALLUSERDATA:
1641         case SIOCX25GCAUSEDIAG:
1642         case SIOCX25SCUDMATCHLEN:
1643         case SIOCX25CALLACCPTAPPRV:
1644         case SIOCX25SENDCALLACCPT:
1645                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1646                 break;
1647         default:
1648                 rc = -ENOIOCTLCMD;
1649                 break;
1650         }
1651         return rc;
1652 }
1653 #endif
1654
1655 static const struct proto_ops x25_proto_ops = {
1656         .family =       AF_X25,
1657         .owner =        THIS_MODULE,
1658         .release =      x25_release,
1659         .bind =         x25_bind,
1660         .connect =      x25_connect,
1661         .socketpair =   sock_no_socketpair,
1662         .accept =       x25_accept,
1663         .getname =      x25_getname,
1664         .poll =         x25_datagram_poll,
1665         .ioctl =        x25_ioctl,
1666 #ifdef CONFIG_COMPAT
1667         .compat_ioctl = compat_x25_ioctl,
1668 #endif
1669         .listen =       x25_listen,
1670         .shutdown =     sock_no_shutdown,
1671         .setsockopt =   x25_setsockopt,
1672         .getsockopt =   x25_getsockopt,
1673         .sendmsg =      x25_sendmsg,
1674         .recvmsg =      x25_recvmsg,
1675         .mmap =         sock_no_mmap,
1676         .sendpage =     sock_no_sendpage,
1677 };
1678
1679 static struct packet_type x25_packet_type __read_mostly = {
1680         .type = cpu_to_be16(ETH_P_X25),
1681         .func = x25_lapb_receive_frame,
1682 };
1683
1684 static struct notifier_block x25_dev_notifier = {
1685         .notifier_call = x25_device_event,
1686 };
1687
1688 void x25_kill_by_neigh(struct x25_neigh *nb)
1689 {
1690         struct sock *s;
1691         struct hlist_node *node;
1692
1693         write_lock_bh(&x25_list_lock);
1694
1695         sk_for_each(s, node, &x25_list)
1696                 if (x25_sk(s)->neighbour == nb)
1697                         x25_disconnect(s, ENETUNREACH, 0, 0);
1698
1699         write_unlock_bh(&x25_list_lock);
1700
1701         /* Remove any related forwards */
1702         x25_clear_forward_by_dev(nb->dev);
1703 }
1704
1705 static int __init x25_init(void)
1706 {
1707         int rc = proto_register(&x25_proto, 0);
1708
1709         if (rc != 0)
1710                 goto out;
1711
1712         sock_register(&x25_family_ops);
1713
1714         dev_add_pack(&x25_packet_type);
1715
1716         register_netdevice_notifier(&x25_dev_notifier);
1717
1718         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1719
1720 #ifdef CONFIG_SYSCTL
1721         x25_register_sysctl();
1722 #endif
1723         x25_proc_init();
1724 out:
1725         return rc;
1726 }
1727 module_init(x25_init);
1728
1729 static void __exit x25_exit(void)
1730 {
1731         x25_proc_exit();
1732         x25_link_free();
1733         x25_route_free();
1734
1735 #ifdef CONFIG_SYSCTL
1736         x25_unregister_sysctl();
1737 #endif
1738
1739         unregister_netdevice_notifier(&x25_dev_notifier);
1740
1741         dev_remove_pack(&x25_packet_type);
1742
1743         sock_unregister(AF_X25);
1744         proto_unregister(&x25_proto);
1745 }
1746 module_exit(x25_exit);
1747
1748 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1749 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1750 MODULE_LICENSE("GPL");
1751 MODULE_ALIAS_NETPROTO(PF_X25);