perf_counter: Provide hw_perf_counter_setup_online() APIs
[linux-2.6] / 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, int optlen)
413 {
414         int opt;
415         struct sock *sk = sock->sk;
416         int rc = -ENOPROTOOPT;
417
418         if (level != SOL_X25 || optname != X25_QBITINCL)
419                 goto out;
420
421         rc = -EINVAL;
422         if (optlen < sizeof(int))
423                 goto out;
424
425         rc = -EFAULT;
426         if (get_user(opt, (int __user *)optval))
427                 goto out;
428
429         x25_sk(sk)->qbitincl = !!opt;
430         rc = 0;
431 out:
432         return rc;
433 }
434
435 static int x25_getsockopt(struct socket *sock, int level, int optname,
436                           char __user *optval, int __user *optlen)
437 {
438         struct sock *sk = sock->sk;
439         int val, len, rc = -ENOPROTOOPT;
440
441         if (level != SOL_X25 || optname != X25_QBITINCL)
442                 goto out;
443
444         rc = -EFAULT;
445         if (get_user(len, optlen))
446                 goto out;
447
448         len = min_t(unsigned int, len, sizeof(int));
449
450         rc = -EINVAL;
451         if (len < 0)
452                 goto out;
453
454         rc = -EFAULT;
455         if (put_user(len, optlen))
456                 goto out;
457
458         val = x25_sk(sk)->qbitincl;
459         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
460 out:
461         return rc;
462 }
463
464 static int x25_listen(struct socket *sock, int backlog)
465 {
466         struct sock *sk = sock->sk;
467         int rc = -EOPNOTSUPP;
468
469         if (sk->sk_state != TCP_LISTEN) {
470                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
471                 sk->sk_max_ack_backlog = backlog;
472                 sk->sk_state           = TCP_LISTEN;
473                 rc = 0;
474         }
475
476         return rc;
477 }
478
479 static struct proto x25_proto = {
480         .name     = "X25",
481         .owner    = THIS_MODULE,
482         .obj_size = sizeof(struct x25_sock),
483 };
484
485 static struct sock *x25_alloc_socket(struct net *net)
486 {
487         struct x25_sock *x25;
488         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
489
490         if (!sk)
491                 goto out;
492
493         sock_init_data(NULL, sk);
494
495         x25 = x25_sk(sk);
496         skb_queue_head_init(&x25->ack_queue);
497         skb_queue_head_init(&x25->fragment_queue);
498         skb_queue_head_init(&x25->interrupt_in_queue);
499         skb_queue_head_init(&x25->interrupt_out_queue);
500 out:
501         return sk;
502 }
503
504 static int x25_create(struct net *net, struct socket *sock, int protocol)
505 {
506         struct sock *sk;
507         struct x25_sock *x25;
508         int rc = -ESOCKTNOSUPPORT;
509
510         if (net != &init_net)
511                 return -EAFNOSUPPORT;
512
513         if (sock->type != SOCK_SEQPACKET || protocol)
514                 goto out;
515
516         rc = -ENOMEM;
517         if ((sk = x25_alloc_socket(net)) == NULL)
518                 goto out;
519
520         x25 = x25_sk(sk);
521
522         sock_init_data(sock, sk);
523
524         x25_init_timers(sk);
525
526         sock->ops    = &x25_proto_ops;
527         sk->sk_protocol = protocol;
528         sk->sk_backlog_rcv = x25_backlog_rcv;
529
530         x25->t21   = sysctl_x25_call_request_timeout;
531         x25->t22   = sysctl_x25_reset_request_timeout;
532         x25->t23   = sysctl_x25_clear_request_timeout;
533         x25->t2    = sysctl_x25_ack_holdback_timeout;
534         x25->state = X25_STATE_0;
535         x25->cudmatchlength = 0;
536         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
537                                                         /* on call accept   */
538
539         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
540         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
541         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
542         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
543         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
544         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
545         x25->dte_facilities.calling_len = 0;
546         x25->dte_facilities.called_len = 0;
547         memset(x25->dte_facilities.called_ae, '\0',
548                         sizeof(x25->dte_facilities.called_ae));
549         memset(x25->dte_facilities.calling_ae, '\0',
550                         sizeof(x25->dte_facilities.calling_ae));
551
552         rc = 0;
553 out:
554         return rc;
555 }
556
557 static struct sock *x25_make_new(struct sock *osk)
558 {
559         struct sock *sk = NULL;
560         struct x25_sock *x25, *ox25;
561
562         if (osk->sk_type != SOCK_SEQPACKET)
563                 goto out;
564
565         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
566                 goto out;
567
568         x25 = x25_sk(sk);
569
570         sk->sk_type        = osk->sk_type;
571         sk->sk_priority    = osk->sk_priority;
572         sk->sk_protocol    = osk->sk_protocol;
573         sk->sk_rcvbuf      = osk->sk_rcvbuf;
574         sk->sk_sndbuf      = osk->sk_sndbuf;
575         sk->sk_state       = TCP_ESTABLISHED;
576         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
577         sock_copy_flags(sk, osk);
578
579         ox25 = x25_sk(osk);
580         x25->t21        = ox25->t21;
581         x25->t22        = ox25->t22;
582         x25->t23        = ox25->t23;
583         x25->t2         = ox25->t2;
584         x25->facilities = ox25->facilities;
585         x25->qbitincl   = ox25->qbitincl;
586         x25->dte_facilities = ox25->dte_facilities;
587         x25->cudmatchlength = ox25->cudmatchlength;
588         x25->accptapprv = ox25->accptapprv;
589
590         x25_init_timers(sk);
591 out:
592         return sk;
593 }
594
595 static int x25_release(struct socket *sock)
596 {
597         struct sock *sk = sock->sk;
598         struct x25_sock *x25;
599
600         if (!sk)
601                 goto out;
602
603         x25 = x25_sk(sk);
604
605         switch (x25->state) {
606
607                 case X25_STATE_0:
608                 case X25_STATE_2:
609                         x25_disconnect(sk, 0, 0, 0);
610                         x25_destroy_socket(sk);
611                         goto out;
612
613                 case X25_STATE_1:
614                 case X25_STATE_3:
615                 case X25_STATE_4:
616                         x25_clear_queues(sk);
617                         x25_write_internal(sk, X25_CLEAR_REQUEST);
618                         x25_start_t23timer(sk);
619                         x25->state = X25_STATE_2;
620                         sk->sk_state    = TCP_CLOSE;
621                         sk->sk_shutdown |= SEND_SHUTDOWN;
622                         sk->sk_state_change(sk);
623                         sock_set_flag(sk, SOCK_DEAD);
624                         sock_set_flag(sk, SOCK_DESTROY);
625                         break;
626         }
627
628         sock_orphan(sk);
629 out:
630         return 0;
631 }
632
633 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
634 {
635         struct sock *sk = sock->sk;
636         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
637
638         if (!sock_flag(sk, SOCK_ZAPPED) ||
639             addr_len != sizeof(struct sockaddr_x25) ||
640             addr->sx25_family != AF_X25)
641                 return -EINVAL;
642
643         x25_sk(sk)->source_addr = addr->sx25_addr;
644         x25_insert_socket(sk);
645         sock_reset_flag(sk, SOCK_ZAPPED);
646         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
647
648         return 0;
649 }
650
651 static int x25_wait_for_connection_establishment(struct sock *sk)
652 {
653         DECLARE_WAITQUEUE(wait, current);
654         int rc;
655
656         add_wait_queue_exclusive(sk->sk_sleep, &wait);
657         for (;;) {
658                 __set_current_state(TASK_INTERRUPTIBLE);
659                 rc = -ERESTARTSYS;
660                 if (signal_pending(current))
661                         break;
662                 rc = sock_error(sk);
663                 if (rc) {
664                         sk->sk_socket->state = SS_UNCONNECTED;
665                         break;
666                 }
667                 rc = 0;
668                 if (sk->sk_state != TCP_ESTABLISHED) {
669                         release_sock(sk);
670                         schedule();
671                         lock_sock(sk);
672                 } else
673                         break;
674         }
675         __set_current_state(TASK_RUNNING);
676         remove_wait_queue(sk->sk_sleep, &wait);
677         return rc;
678 }
679
680 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
681                        int addr_len, int flags)
682 {
683         struct sock *sk = sock->sk;
684         struct x25_sock *x25 = x25_sk(sk);
685         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
686         struct x25_route *rt;
687         int rc = 0;
688
689         lock_sock(sk);
690         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
691                 sock->state = SS_CONNECTED;
692                 goto out; /* Connect completed during a ERESTARTSYS event */
693         }
694
695         rc = -ECONNREFUSED;
696         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
697                 sock->state = SS_UNCONNECTED;
698                 goto out;
699         }
700
701         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
702         if (sk->sk_state == TCP_ESTABLISHED)
703                 goto out;
704
705         sk->sk_state   = TCP_CLOSE;
706         sock->state = SS_UNCONNECTED;
707
708         rc = -EINVAL;
709         if (addr_len != sizeof(struct sockaddr_x25) ||
710             addr->sx25_family != AF_X25)
711                 goto out;
712
713         rc = -ENETUNREACH;
714         rt = x25_get_route(&addr->sx25_addr);
715         if (!rt)
716                 goto out;
717
718         x25->neighbour = x25_get_neigh(rt->dev);
719         if (!x25->neighbour)
720                 goto out_put_route;
721
722         x25_limit_facilities(&x25->facilities, x25->neighbour);
723
724         x25->lci = x25_new_lci(x25->neighbour);
725         if (!x25->lci)
726                 goto out_put_neigh;
727
728         rc = -EINVAL;
729         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
730                 goto out_put_neigh;
731
732         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
733                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
734
735         x25->dest_addr = addr->sx25_addr;
736
737         /* Move to connecting socket, start sending Connect Requests */
738         sock->state   = SS_CONNECTING;
739         sk->sk_state  = TCP_SYN_SENT;
740
741         x25->state = X25_STATE_1;
742
743         x25_write_internal(sk, X25_CALL_REQUEST);
744
745         x25_start_heartbeat(sk);
746         x25_start_t21timer(sk);
747
748         /* Now the loop */
749         rc = -EINPROGRESS;
750         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
751                 goto out_put_neigh;
752
753         rc = x25_wait_for_connection_establishment(sk);
754         if (rc)
755                 goto out_put_neigh;
756
757         sock->state = SS_CONNECTED;
758         rc = 0;
759 out_put_neigh:
760         if (rc)
761                 x25_neigh_put(x25->neighbour);
762 out_put_route:
763         x25_route_put(rt);
764 out:
765         release_sock(sk);
766         return rc;
767 }
768
769 static int x25_wait_for_data(struct sock *sk, long timeout)
770 {
771         DECLARE_WAITQUEUE(wait, current);
772         int rc = 0;
773
774         add_wait_queue_exclusive(sk->sk_sleep, &wait);
775         for (;;) {
776                 __set_current_state(TASK_INTERRUPTIBLE);
777                 if (sk->sk_shutdown & RCV_SHUTDOWN)
778                         break;
779                 rc = -ERESTARTSYS;
780                 if (signal_pending(current))
781                         break;
782                 rc = -EAGAIN;
783                 if (!timeout)
784                         break;
785                 rc = 0;
786                 if (skb_queue_empty(&sk->sk_receive_queue)) {
787                         release_sock(sk);
788                         timeout = schedule_timeout(timeout);
789                         lock_sock(sk);
790                 } else
791                         break;
792         }
793         __set_current_state(TASK_RUNNING);
794         remove_wait_queue(sk->sk_sleep, &wait);
795         return rc;
796 }
797
798 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
799 {
800         struct sock *sk = sock->sk;
801         struct sock *newsk;
802         struct sk_buff *skb;
803         int rc = -EINVAL;
804
805         if (!sk || sk->sk_state != TCP_LISTEN)
806                 goto out;
807
808         rc = -EOPNOTSUPP;
809         if (sk->sk_type != SOCK_SEQPACKET)
810                 goto out;
811
812         lock_sock(sk);
813         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
814         if (rc)
815                 goto out2;
816         skb = skb_dequeue(&sk->sk_receive_queue);
817         rc = -EINVAL;
818         if (!skb->sk)
819                 goto out2;
820         newsk            = skb->sk;
821         sock_graft(newsk, newsock);
822
823         /* Now attach up the new socket */
824         skb->sk = NULL;
825         kfree_skb(skb);
826         sk->sk_ack_backlog--;
827         newsock->state = SS_CONNECTED;
828         rc = 0;
829 out2:
830         release_sock(sk);
831 out:
832         return rc;
833 }
834
835 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
836                        int *uaddr_len, int peer)
837 {
838         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
839         struct sock *sk = sock->sk;
840         struct x25_sock *x25 = x25_sk(sk);
841
842         if (peer) {
843                 if (sk->sk_state != TCP_ESTABLISHED)
844                         return -ENOTCONN;
845                 sx25->sx25_addr = x25->dest_addr;
846         } else
847                 sx25->sx25_addr = x25->source_addr;
848
849         sx25->sx25_family = AF_X25;
850         *uaddr_len = sizeof(*sx25);
851
852         return 0;
853 }
854
855 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
856                         unsigned int lci)
857 {
858         struct sock *sk;
859         struct sock *make;
860         struct x25_sock *makex25;
861         struct x25_address source_addr, dest_addr;
862         struct x25_facilities facilities;
863         struct x25_dte_facilities dte_facilities;
864         int len, addr_len, rc;
865
866         /*
867          *      Remove the LCI and frame type.
868          */
869         skb_pull(skb, X25_STD_MIN_LEN);
870
871         /*
872          *      Extract the X.25 addresses and convert them to ASCII strings,
873          *      and remove them.
874          */
875         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
876         skb_pull(skb, addr_len);
877
878         /*
879          *      Get the length of the facilities, skip past them for the moment
880          *      get the call user data because this is needed to determine
881          *      the correct listener
882          */
883         len = skb->data[0] + 1;
884         skb_pull(skb,len);
885
886         /*
887          *      Find a listener for the particular address/cud pair.
888          */
889         sk = x25_find_listener(&source_addr,skb);
890         skb_push(skb,len);
891
892         if (sk != NULL && sk_acceptq_is_full(sk)) {
893                 goto out_sock_put;
894         }
895
896         /*
897          *      We dont have any listeners for this incoming call.
898          *      Try forwarding it.
899          */
900         if (sk == NULL) {
901                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
902                 if (sysctl_x25_forward &&
903                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
904                 {
905                         /* Call was forwarded, dont process it any more */
906                         kfree_skb(skb);
907                         rc = 1;
908                         goto out;
909                 } else {
910                         /* No listeners, can't forward, clear the call */
911                         goto out_clear_request;
912                 }
913         }
914
915         /*
916          *      Try to reach a compromise on the requested facilities.
917          */
918         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
919         if (len == -1)
920                 goto out_sock_put;
921
922         /*
923          * current neighbour/link might impose additional limits
924          * on certain facilties
925          */
926
927         x25_limit_facilities(&facilities, nb);
928
929         /*
930          *      Try to create a new socket.
931          */
932         make = x25_make_new(sk);
933         if (!make)
934                 goto out_sock_put;
935
936         /*
937          *      Remove the facilities
938          */
939         skb_pull(skb, len);
940
941         skb->sk     = make;
942         make->sk_state = TCP_ESTABLISHED;
943
944         makex25 = x25_sk(make);
945         makex25->lci           = lci;
946         makex25->dest_addr     = dest_addr;
947         makex25->source_addr   = source_addr;
948         makex25->neighbour     = nb;
949         makex25->facilities    = facilities;
950         makex25->dte_facilities= dte_facilities;
951         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
952         /* ensure no reverse facil on accept */
953         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
954         /* ensure no calling address extension on accept */
955         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
956         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
957
958         /* Normally all calls are accepted immediatly */
959         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
960                 x25_write_internal(make, X25_CALL_ACCEPTED);
961                 makex25->state = X25_STATE_3;
962         }
963
964         /*
965          *      Incoming Call User Data.
966          */
967         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
968         makex25->calluserdata.cudlength = skb->len;
969
970         sk->sk_ack_backlog++;
971
972         x25_insert_socket(make);
973
974         skb_queue_head(&sk->sk_receive_queue, skb);
975
976         x25_start_heartbeat(make);
977
978         if (!sock_flag(sk, SOCK_DEAD))
979                 sk->sk_data_ready(sk, skb->len);
980         rc = 1;
981         sock_put(sk);
982 out:
983         return rc;
984 out_sock_put:
985         sock_put(sk);
986 out_clear_request:
987         rc = 0;
988         x25_transmit_clear_request(nb, lci, 0x01);
989         goto out;
990 }
991
992 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
993                        struct msghdr *msg, size_t len)
994 {
995         struct sock *sk = sock->sk;
996         struct x25_sock *x25 = x25_sk(sk);
997         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
998         struct sockaddr_x25 sx25;
999         struct sk_buff *skb;
1000         unsigned char *asmptr;
1001         int noblock = msg->msg_flags & MSG_DONTWAIT;
1002         size_t size;
1003         int qbit = 0, rc = -EINVAL;
1004
1005         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1006                 goto out;
1007
1008         /* we currently don't support segmented records at the user interface */
1009         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1010                 goto out;
1011
1012         rc = -EADDRNOTAVAIL;
1013         if (sock_flag(sk, SOCK_ZAPPED))
1014                 goto out;
1015
1016         rc = -EPIPE;
1017         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1018                 send_sig(SIGPIPE, current, 0);
1019                 goto out;
1020         }
1021
1022         rc = -ENETUNREACH;
1023         if (!x25->neighbour)
1024                 goto out;
1025
1026         if (usx25) {
1027                 rc = -EINVAL;
1028                 if (msg->msg_namelen < sizeof(sx25))
1029                         goto out;
1030                 memcpy(&sx25, usx25, sizeof(sx25));
1031                 rc = -EISCONN;
1032                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1033                         goto out;
1034                 rc = -EINVAL;
1035                 if (sx25.sx25_family != AF_X25)
1036                         goto out;
1037         } else {
1038                 /*
1039                  *      FIXME 1003.1g - if the socket is like this because
1040                  *      it has become closed (not started closed) we ought
1041                  *      to SIGPIPE, EPIPE;
1042                  */
1043                 rc = -ENOTCONN;
1044                 if (sk->sk_state != TCP_ESTABLISHED)
1045                         goto out;
1046
1047                 sx25.sx25_family = AF_X25;
1048                 sx25.sx25_addr   = x25->dest_addr;
1049         }
1050
1051         /* Sanity check the packet size */
1052         if (len > 65535) {
1053                 rc = -EMSGSIZE;
1054                 goto out;
1055         }
1056
1057         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1058
1059         /* Build a packet */
1060         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1061
1062         if ((msg->msg_flags & MSG_OOB) && len > 32)
1063                 len = 32;
1064
1065         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1066
1067         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1068         if (!skb)
1069                 goto out;
1070         X25_SKB_CB(skb)->flags = msg->msg_flags;
1071
1072         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1073
1074         /*
1075          *      Put the data on the end
1076          */
1077         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1078
1079         skb_reset_transport_header(skb);
1080         skb_put(skb, len);
1081
1082         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1083         if (rc)
1084                 goto out_kfree_skb;
1085
1086         /*
1087          *      If the Q BIT Include socket option is in force, the first
1088          *      byte of the user data is the logical value of the Q Bit.
1089          */
1090         if (x25->qbitincl) {
1091                 qbit = skb->data[0];
1092                 skb_pull(skb, 1);
1093         }
1094
1095         /*
1096          *      Push down the X.25 header
1097          */
1098         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1099
1100         if (msg->msg_flags & MSG_OOB) {
1101                 if (x25->neighbour->extended) {
1102                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1103                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1104                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1105                         *asmptr++ = X25_INTERRUPT;
1106                 } else {
1107                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1108                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1109                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1110                         *asmptr++ = X25_INTERRUPT;
1111                 }
1112         } else {
1113                 if (x25->neighbour->extended) {
1114                         /* Build an Extended X.25 header */
1115                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1116                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1117                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1118                         *asmptr++ = X25_DATA;
1119                         *asmptr++ = X25_DATA;
1120                 } else {
1121                         /* Build an Standard X.25 header */
1122                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1123                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1124                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1125                         *asmptr++ = X25_DATA;
1126                 }
1127
1128                 if (qbit)
1129                         skb->data[0] |= X25_Q_BIT;
1130         }
1131
1132         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1133         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1134
1135         rc = -ENOTCONN;
1136         if (sk->sk_state != TCP_ESTABLISHED)
1137                 goto out_kfree_skb;
1138
1139         if (msg->msg_flags & MSG_OOB)
1140                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1141         else {
1142                 rc = x25_output(sk, skb);
1143                 len = rc;
1144                 if (rc < 0)
1145                         kfree_skb(skb);
1146                 else if (x25->qbitincl)
1147                         len++;
1148         }
1149
1150         /*
1151          * lock_sock() is currently only used to serialize this x25_kick()
1152          * against input-driven x25_kick() calls. It currently only blocks
1153          * incoming packets for this socket and does not protect against
1154          * any other socket state changes and is not called from anywhere
1155          * else. As x25_kick() cannot block and as long as all socket
1156          * operations are BKL-wrapped, we don't need take to care about
1157          * purging the backlog queue in x25_release().
1158          *
1159          * Using lock_sock() to protect all socket operations entirely
1160          * (and making the whole x25 stack SMP aware) unfortunately would
1161          * require major changes to {send,recv}msg and skb allocation methods.
1162          * -> 2.5 ;)
1163          */
1164         lock_sock(sk);
1165         x25_kick(sk);
1166         release_sock(sk);
1167         rc = len;
1168 out:
1169         return rc;
1170 out_kfree_skb:
1171         kfree_skb(skb);
1172         goto out;
1173 }
1174
1175
1176 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1177                        struct msghdr *msg, size_t size,
1178                        int flags)
1179 {
1180         struct sock *sk = sock->sk;
1181         struct x25_sock *x25 = x25_sk(sk);
1182         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1183         size_t copied;
1184         int qbit;
1185         struct sk_buff *skb;
1186         unsigned char *asmptr;
1187         int rc = -ENOTCONN;
1188
1189         /*
1190          * This works for seqpacket too. The receiver has ordered the queue for
1191          * us! We do one quick check first though
1192          */
1193         if (sk->sk_state != TCP_ESTABLISHED)
1194                 goto out;
1195
1196         if (flags & MSG_OOB) {
1197                 rc = -EINVAL;
1198                 if (sock_flag(sk, SOCK_URGINLINE) ||
1199                     !skb_peek(&x25->interrupt_in_queue))
1200                         goto out;
1201
1202                 skb = skb_dequeue(&x25->interrupt_in_queue);
1203
1204                 skb_pull(skb, X25_STD_MIN_LEN);
1205
1206                 /*
1207                  *      No Q bit information on Interrupt data.
1208                  */
1209                 if (x25->qbitincl) {
1210                         asmptr  = skb_push(skb, 1);
1211                         *asmptr = 0x00;
1212                 }
1213
1214                 msg->msg_flags |= MSG_OOB;
1215         } else {
1216                 /* Now we can treat all alike */
1217                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1218                                         flags & MSG_DONTWAIT, &rc);
1219                 if (!skb)
1220                         goto out;
1221
1222                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1223
1224                 skb_pull(skb, x25->neighbour->extended ?
1225                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1226
1227                 if (x25->qbitincl) {
1228                         asmptr  = skb_push(skb, 1);
1229                         *asmptr = qbit;
1230                 }
1231         }
1232
1233         skb_reset_transport_header(skb);
1234         copied = skb->len;
1235
1236         if (copied > size) {
1237                 copied = size;
1238                 msg->msg_flags |= MSG_TRUNC;
1239         }
1240
1241         /* Currently, each datagram always contains a complete record */
1242         msg->msg_flags |= MSG_EOR;
1243
1244         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1245         if (rc)
1246                 goto out_free_dgram;
1247
1248         if (sx25) {
1249                 sx25->sx25_family = AF_X25;
1250                 sx25->sx25_addr   = x25->dest_addr;
1251         }
1252
1253         msg->msg_namelen = sizeof(struct sockaddr_x25);
1254
1255         lock_sock(sk);
1256         x25_check_rbuf(sk);
1257         release_sock(sk);
1258         rc = copied;
1259 out_free_dgram:
1260         skb_free_datagram(sk, skb);
1261 out:
1262         return rc;
1263 }
1264
1265
1266 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1267 {
1268         struct sock *sk = sock->sk;
1269         struct x25_sock *x25 = x25_sk(sk);
1270         void __user *argp = (void __user *)arg;
1271         int rc;
1272
1273         switch (cmd) {
1274                 case TIOCOUTQ: {
1275                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1276
1277                         if (amount < 0)
1278                                 amount = 0;
1279                         rc = put_user(amount, (unsigned int __user *)argp);
1280                         break;
1281                 }
1282
1283                 case TIOCINQ: {
1284                         struct sk_buff *skb;
1285                         int amount = 0;
1286                         /*
1287                          * These two are safe on a single CPU system as
1288                          * only user tasks fiddle here
1289                          */
1290                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1291                                 amount = skb->len;
1292                         rc = put_user(amount, (unsigned int __user *)argp);
1293                         break;
1294                 }
1295
1296                 case SIOCGSTAMP:
1297                         rc = -EINVAL;
1298                         if (sk)
1299                                 rc = sock_get_timestamp(sk,
1300                                                 (struct timeval __user *)argp);
1301                         break;
1302                 case SIOCGSTAMPNS:
1303                         rc = -EINVAL;
1304                         if (sk)
1305                                 rc = sock_get_timestampns(sk,
1306                                                 (struct timespec __user *)argp);
1307                         break;
1308                 case SIOCGIFADDR:
1309                 case SIOCSIFADDR:
1310                 case SIOCGIFDSTADDR:
1311                 case SIOCSIFDSTADDR:
1312                 case SIOCGIFBRDADDR:
1313                 case SIOCSIFBRDADDR:
1314                 case SIOCGIFNETMASK:
1315                 case SIOCSIFNETMASK:
1316                 case SIOCGIFMETRIC:
1317                 case SIOCSIFMETRIC:
1318                         rc = -EINVAL;
1319                         break;
1320                 case SIOCADDRT:
1321                 case SIOCDELRT:
1322                         rc = -EPERM;
1323                         if (!capable(CAP_NET_ADMIN))
1324                                 break;
1325                         rc = x25_route_ioctl(cmd, argp);
1326                         break;
1327                 case SIOCX25GSUBSCRIP:
1328                         rc = x25_subscr_ioctl(cmd, argp);
1329                         break;
1330                 case SIOCX25SSUBSCRIP:
1331                         rc = -EPERM;
1332                         if (!capable(CAP_NET_ADMIN))
1333                                 break;
1334                         rc = x25_subscr_ioctl(cmd, argp);
1335                         break;
1336                 case SIOCX25GFACILITIES: {
1337                         struct x25_facilities fac = x25->facilities;
1338                         rc = copy_to_user(argp, &fac,
1339                                           sizeof(fac)) ? -EFAULT : 0;
1340                         break;
1341                 }
1342
1343                 case SIOCX25SFACILITIES: {
1344                         struct x25_facilities facilities;
1345                         rc = -EFAULT;
1346                         if (copy_from_user(&facilities, argp,
1347                                            sizeof(facilities)))
1348                                 break;
1349                         rc = -EINVAL;
1350                         if (sk->sk_state != TCP_LISTEN &&
1351                             sk->sk_state != TCP_CLOSE)
1352                                 break;
1353                         if (facilities.pacsize_in < X25_PS16 ||
1354                             facilities.pacsize_in > X25_PS4096)
1355                                 break;
1356                         if (facilities.pacsize_out < X25_PS16 ||
1357                             facilities.pacsize_out > X25_PS4096)
1358                                 break;
1359                         if (facilities.winsize_in < 1 ||
1360                             facilities.winsize_in > 127)
1361                                 break;
1362                         if (facilities.throughput < 0x03 ||
1363                             facilities.throughput > 0xDD)
1364                                 break;
1365                         if (facilities.reverse &&
1366                                 (facilities.reverse | 0x81)!= 0x81)
1367                                 break;
1368                         x25->facilities = facilities;
1369                         rc = 0;
1370                         break;
1371                 }
1372
1373                 case SIOCX25GDTEFACILITIES: {
1374                         rc = copy_to_user(argp, &x25->dte_facilities,
1375                                                 sizeof(x25->dte_facilities));
1376                         if (rc)
1377                                 rc = -EFAULT;
1378                         break;
1379                 }
1380
1381                 case SIOCX25SDTEFACILITIES: {
1382                         struct x25_dte_facilities dtefacs;
1383                         rc = -EFAULT;
1384                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1385                                 break;
1386                         rc = -EINVAL;
1387                         if (sk->sk_state != TCP_LISTEN &&
1388                                         sk->sk_state != TCP_CLOSE)
1389                                 break;
1390                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1391                                 break;
1392                         if (dtefacs.calling_ae == NULL)
1393                                 break;
1394                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1395                                 break;
1396                         if (dtefacs.called_ae == NULL)
1397                                 break;
1398                         x25->dte_facilities = dtefacs;
1399                         rc = 0;
1400                         break;
1401                 }
1402
1403                 case SIOCX25GCALLUSERDATA: {
1404                         struct x25_calluserdata cud = x25->calluserdata;
1405                         rc = copy_to_user(argp, &cud,
1406                                           sizeof(cud)) ? -EFAULT : 0;
1407                         break;
1408                 }
1409
1410                 case SIOCX25SCALLUSERDATA: {
1411                         struct x25_calluserdata calluserdata;
1412
1413                         rc = -EFAULT;
1414                         if (copy_from_user(&calluserdata, argp,
1415                                            sizeof(calluserdata)))
1416                                 break;
1417                         rc = -EINVAL;
1418                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1419                                 break;
1420                         x25->calluserdata = calluserdata;
1421                         rc = 0;
1422                         break;
1423                 }
1424
1425                 case SIOCX25GCAUSEDIAG: {
1426                         struct x25_causediag causediag;
1427                         causediag = x25->causediag;
1428                         rc = copy_to_user(argp, &causediag,
1429                                           sizeof(causediag)) ? -EFAULT : 0;
1430                         break;
1431                 }
1432
1433                 case SIOCX25SCUDMATCHLEN: {
1434                         struct x25_subaddr sub_addr;
1435                         rc = -EINVAL;
1436                         if(sk->sk_state != TCP_CLOSE)
1437                                 break;
1438                         rc = -EFAULT;
1439                         if (copy_from_user(&sub_addr, argp,
1440                                         sizeof(sub_addr)))
1441                                 break;
1442                         rc = -EINVAL;
1443                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1444                                 break;
1445                         x25->cudmatchlength = sub_addr.cudmatchlength;
1446                         rc = 0;
1447                         break;
1448                 }
1449
1450                 case SIOCX25CALLACCPTAPPRV: {
1451                         rc = -EINVAL;
1452                         if (sk->sk_state != TCP_CLOSE)
1453                                 break;
1454                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1455                         rc = 0;
1456                         break;
1457                 }
1458
1459                 case SIOCX25SENDCALLACCPT:  {
1460                         rc = -EINVAL;
1461                         if (sk->sk_state != TCP_ESTABLISHED)
1462                                 break;
1463                         if (x25->accptapprv)    /* must call accptapprv above */
1464                                 break;
1465                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1466                         x25->state = X25_STATE_3;
1467                         rc = 0;
1468                         break;
1469                 }
1470
1471                 default:
1472                         rc = -ENOIOCTLCMD;
1473                         break;
1474         }
1475
1476         return rc;
1477 }
1478
1479 static struct net_proto_family x25_family_ops = {
1480         .family =       AF_X25,
1481         .create =       x25_create,
1482         .owner  =       THIS_MODULE,
1483 };
1484
1485 #ifdef CONFIG_COMPAT
1486 static int compat_x25_subscr_ioctl(unsigned int cmd,
1487                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1488 {
1489         struct compat_x25_subscrip_struct x25_subscr;
1490         struct x25_neigh *nb;
1491         struct net_device *dev;
1492         int rc = -EINVAL;
1493
1494         rc = -EFAULT;
1495         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1496                 goto out;
1497
1498         rc = -EINVAL;
1499         dev = x25_dev_get(x25_subscr.device);
1500         if (dev == NULL)
1501                 goto out;
1502
1503         nb = x25_get_neigh(dev);
1504         if (nb == NULL)
1505                 goto out_dev_put;
1506
1507         dev_put(dev);
1508
1509         if (cmd == SIOCX25GSUBSCRIP) {
1510                 x25_subscr.extended = nb->extended;
1511                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1512                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1513                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1514         } else {
1515                 rc = -EINVAL;
1516                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1517                         rc = 0;
1518                         nb->extended = x25_subscr.extended;
1519                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1520                 }
1521         }
1522         x25_neigh_put(nb);
1523 out:
1524         return rc;
1525 out_dev_put:
1526         dev_put(dev);
1527         goto out;
1528 }
1529
1530 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1531                                 unsigned long arg)
1532 {
1533         void __user *argp = compat_ptr(arg);
1534         struct sock *sk = sock->sk;
1535
1536         int rc = -ENOIOCTLCMD;
1537
1538         switch(cmd) {
1539         case TIOCOUTQ:
1540         case TIOCINQ:
1541                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1542                 break;
1543         case SIOCGSTAMP:
1544                 rc = -EINVAL;
1545                 if (sk)
1546                         rc = compat_sock_get_timestamp(sk,
1547                                         (struct timeval __user*)argp);
1548                 break;
1549         case SIOCGSTAMPNS:
1550                 rc = -EINVAL;
1551                 if (sk)
1552                         rc = compat_sock_get_timestampns(sk,
1553                                         (struct timespec __user*)argp);
1554                 break;
1555         case SIOCGIFADDR:
1556         case SIOCSIFADDR:
1557         case SIOCGIFDSTADDR:
1558         case SIOCSIFDSTADDR:
1559         case SIOCGIFBRDADDR:
1560         case SIOCSIFBRDADDR:
1561         case SIOCGIFNETMASK:
1562         case SIOCSIFNETMASK:
1563         case SIOCGIFMETRIC:
1564         case SIOCSIFMETRIC:
1565                 rc = -EINVAL;
1566                 break;
1567         case SIOCADDRT:
1568         case SIOCDELRT:
1569                 rc = -EPERM;
1570                 if (!capable(CAP_NET_ADMIN))
1571                         break;
1572                 rc = x25_route_ioctl(cmd, argp);
1573                 break;
1574         case SIOCX25GSUBSCRIP:
1575                 rc = compat_x25_subscr_ioctl(cmd, argp);
1576                 break;
1577         case SIOCX25SSUBSCRIP:
1578                 rc = -EPERM;
1579                 if (!capable(CAP_NET_ADMIN))
1580                         break;
1581                 rc = compat_x25_subscr_ioctl(cmd, argp);
1582                 break;
1583         case SIOCX25GFACILITIES:
1584         case SIOCX25SFACILITIES:
1585         case SIOCX25GDTEFACILITIES:
1586         case SIOCX25SDTEFACILITIES:
1587         case SIOCX25GCALLUSERDATA:
1588         case SIOCX25SCALLUSERDATA:
1589         case SIOCX25GCAUSEDIAG:
1590         case SIOCX25SCUDMATCHLEN:
1591         case SIOCX25CALLACCPTAPPRV:
1592         case SIOCX25SENDCALLACCPT:
1593                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1594                 break;
1595         default:
1596                 rc = -ENOIOCTLCMD;
1597                 break;
1598         }
1599         return rc;
1600 }
1601 #endif
1602
1603 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1604         .family =       AF_X25,
1605         .owner =        THIS_MODULE,
1606         .release =      x25_release,
1607         .bind =         x25_bind,
1608         .connect =      x25_connect,
1609         .socketpair =   sock_no_socketpair,
1610         .accept =       x25_accept,
1611         .getname =      x25_getname,
1612         .poll =         datagram_poll,
1613         .ioctl =        x25_ioctl,
1614 #ifdef CONFIG_COMPAT
1615         .compat_ioctl = compat_x25_ioctl,
1616 #endif
1617         .listen =       x25_listen,
1618         .shutdown =     sock_no_shutdown,
1619         .setsockopt =   x25_setsockopt,
1620         .getsockopt =   x25_getsockopt,
1621         .sendmsg =      x25_sendmsg,
1622         .recvmsg =      x25_recvmsg,
1623         .mmap =         sock_no_mmap,
1624         .sendpage =     sock_no_sendpage,
1625 };
1626
1627 SOCKOPS_WRAP(x25_proto, AF_X25);
1628
1629 static struct packet_type x25_packet_type __read_mostly = {
1630         .type = cpu_to_be16(ETH_P_X25),
1631         .func = x25_lapb_receive_frame,
1632 };
1633
1634 static struct notifier_block x25_dev_notifier = {
1635         .notifier_call = x25_device_event,
1636 };
1637
1638 void x25_kill_by_neigh(struct x25_neigh *nb)
1639 {
1640         struct sock *s;
1641         struct hlist_node *node;
1642
1643         write_lock_bh(&x25_list_lock);
1644
1645         sk_for_each(s, node, &x25_list)
1646                 if (x25_sk(s)->neighbour == nb)
1647                         x25_disconnect(s, ENETUNREACH, 0, 0);
1648
1649         write_unlock_bh(&x25_list_lock);
1650
1651         /* Remove any related forwards */
1652         x25_clear_forward_by_dev(nb->dev);
1653 }
1654
1655 static int __init x25_init(void)
1656 {
1657         int rc = proto_register(&x25_proto, 0);
1658
1659         if (rc != 0)
1660                 goto out;
1661
1662         sock_register(&x25_family_ops);
1663
1664         dev_add_pack(&x25_packet_type);
1665
1666         register_netdevice_notifier(&x25_dev_notifier);
1667
1668         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1669
1670 #ifdef CONFIG_SYSCTL
1671         x25_register_sysctl();
1672 #endif
1673         x25_proc_init();
1674 out:
1675         return rc;
1676 }
1677 module_init(x25_init);
1678
1679 static void __exit x25_exit(void)
1680 {
1681         x25_proc_exit();
1682         x25_link_free();
1683         x25_route_free();
1684
1685 #ifdef CONFIG_SYSCTL
1686         x25_unregister_sysctl();
1687 #endif
1688
1689         unregister_netdevice_notifier(&x25_dev_notifier);
1690
1691         dev_remove_pack(&x25_packet_type);
1692
1693         sock_unregister(AF_X25);
1694         proto_unregister(&x25_proto);
1695 }
1696 module_exit(x25_exit);
1697
1698 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1699 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1700 MODULE_LICENSE("GPL");
1701 MODULE_ALIAS_NETPROTO(PF_X25);