[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.
[linux-3.10.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/timer.h>
44 #include <linux/string.h>
45 #include <linux/net.h>
46 #include <linux/netdevice.h>
47 #include <linux/if_arp.h>
48 #include <linux/skbuff.h>
49 #include <net/sock.h>
50 #include <net/tcp_states.h>
51 #include <asm/uaccess.h>
52 #include <linux/fcntl.h>
53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
54 #include <linux/notifier.h>
55 #include <linux/init.h>
56 #include <linux/compat.h>
57
58 #include <net/x25.h>
59 #include <net/compat.h>
60
61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
66 int sysctl_x25_forward                 = 0;
67
68 HLIST_HEAD(x25_list);
69 DEFINE_RWLOCK(x25_list_lock);
70
71 static const struct proto_ops x25_proto_ops;
72
73 static struct x25_address null_x25_address = {"               "};
74
75 #ifdef CONFIG_COMPAT
76 struct compat_x25_subscrip_struct {
77         char device[200-sizeof(compat_ulong_t)];
78         compat_ulong_t global_facil_mask;
79         compat_uint_t extended;
80 };
81 #endif
82
83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
84                   struct x25_address *calling_addr)
85 {
86         unsigned int called_len, calling_len;
87         char *called, *calling;
88         unsigned int i;
89
90         called_len  = (*p >> 0) & 0x0F;
91         calling_len = (*p >> 4) & 0x0F;
92
93         called  = called_addr->x25_addr;
94         calling = calling_addr->x25_addr;
95         p++;
96
97         for (i = 0; i < (called_len + calling_len); i++) {
98                 if (i < called_len) {
99                         if (i % 2 != 0) {
100                                 *called++ = ((*p >> 0) & 0x0F) + '0';
101                                 p++;
102                         } else {
103                                 *called++ = ((*p >> 4) & 0x0F) + '0';
104                         }
105                 } else {
106                         if (i % 2 != 0) {
107                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
108                                 p++;
109                         } else {
110                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
111                         }
112                 }
113         }
114
115         *called = *calling = '\0';
116
117         return 1 + (called_len + calling_len + 1) / 2;
118 }
119
120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
121                   struct x25_address *calling_addr)
122 {
123         unsigned int called_len, calling_len;
124         char *called, *calling;
125         int i;
126
127         called  = called_addr->x25_addr;
128         calling = calling_addr->x25_addr;
129
130         called_len  = strlen(called);
131         calling_len = strlen(calling);
132
133         *p++ = (calling_len << 4) | (called_len << 0);
134
135         for (i = 0; i < (called_len + calling_len); i++) {
136                 if (i < called_len) {
137                         if (i % 2 != 0) {
138                                 *p |= (*called++ - '0') << 0;
139                                 p++;
140                         } else {
141                                 *p = 0x00;
142                                 *p |= (*called++ - '0') << 4;
143                         }
144                 } else {
145                         if (i % 2 != 0) {
146                                 *p |= (*calling++ - '0') << 0;
147                                 p++;
148                         } else {
149                                 *p = 0x00;
150                                 *p |= (*calling++ - '0') << 4;
151                         }
152                 }
153         }
154
155         return 1 + (called_len + calling_len + 1) / 2;
156 }
157
158 /*
159  *      Socket removal during an interrupt is now safe.
160  */
161 static void x25_remove_socket(struct sock *sk)
162 {
163         write_lock_bh(&x25_list_lock);
164         sk_del_node_init(sk);
165         write_unlock_bh(&x25_list_lock);
166 }
167
168 /*
169  *      Kill all bound sockets on a dropped device.
170  */
171 static void x25_kill_by_device(struct net_device *dev)
172 {
173         struct sock *s;
174         struct hlist_node *node;
175
176         write_lock_bh(&x25_list_lock);
177
178         sk_for_each(s, node, &x25_list)
179                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
180                         x25_disconnect(s, ENETUNREACH, 0, 0);
181
182         write_unlock_bh(&x25_list_lock);
183 }
184
185 /*
186  *      Handle device status changes.
187  */
188 static int x25_device_event(struct notifier_block *this, unsigned long event,
189                             void *ptr)
190 {
191         struct net_device *dev = ptr;
192         struct x25_neigh *nb;
193
194         if (dev_net(dev) != &init_net)
195                 return NOTIFY_DONE;
196
197         if (dev->type == ARPHRD_X25
198 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
199          || dev->type == ARPHRD_ETHER
200 #endif
201          ) {
202                 switch (event) {
203                         case NETDEV_UP:
204                                 x25_link_device_up(dev);
205                                 break;
206                         case NETDEV_GOING_DOWN:
207                                 nb = x25_get_neigh(dev);
208                                 if (nb) {
209                                         x25_terminate_link(nb);
210                                         x25_neigh_put(nb);
211                                 }
212                                 break;
213                         case NETDEV_DOWN:
214                                 x25_kill_by_device(dev);
215                                 x25_route_device_down(dev);
216                                 x25_link_device_down(dev);
217                                 break;
218                 }
219         }
220
221         return NOTIFY_DONE;
222 }
223
224 /*
225  *      Add a socket to the bound sockets list.
226  */
227 static void x25_insert_socket(struct sock *sk)
228 {
229         write_lock_bh(&x25_list_lock);
230         sk_add_node(sk, &x25_list);
231         write_unlock_bh(&x25_list_lock);
232 }
233
234 /*
235  *      Find a socket that wants to accept the Call Request we just
236  *      received. Check the full list for an address/cud match.
237  *      If no cuds match return the next_best thing, an address match.
238  *      Note: if a listening socket has cud set it must only get calls
239  *      with matching cud.
240  */
241 static struct sock *x25_find_listener(struct x25_address *addr,
242                                         struct sk_buff *skb)
243 {
244         struct sock *s;
245         struct sock *next_best;
246         struct hlist_node *node;
247
248         read_lock_bh(&x25_list_lock);
249         next_best = NULL;
250
251         sk_for_each(s, node, &x25_list)
252                 if ((!strcmp(addr->x25_addr,
253                         x25_sk(s)->source_addr.x25_addr) ||
254                                 !strcmp(addr->x25_addr,
255                                         null_x25_address.x25_addr)) &&
256                                         s->sk_state == TCP_LISTEN) {
257                         /*
258                          * Found a listening socket, now check the incoming
259                          * call user data vs this sockets call user data
260                          */
261                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
262                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
263                                         skb->data,
264                                         x25_sk(s)->cudmatchlength)) == 0) {
265                                         sock_hold(s);
266                                         goto found;
267                                  }
268                         } else
269                                 next_best = s;
270                 }
271         if (next_best) {
272                 s = next_best;
273                 sock_hold(s);
274                 goto found;
275         }
276         s = NULL;
277 found:
278         read_unlock_bh(&x25_list_lock);
279         return s;
280 }
281
282 /*
283  *      Find a connected X.25 socket given my LCI and neighbour.
284  */
285 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
286 {
287         struct sock *s;
288         struct hlist_node *node;
289
290         sk_for_each(s, node, &x25_list)
291                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
292                         sock_hold(s);
293                         goto found;
294                 }
295         s = NULL;
296 found:
297         return s;
298 }
299
300 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
301 {
302         struct sock *s;
303
304         read_lock_bh(&x25_list_lock);
305         s = __x25_find_socket(lci, nb);
306         read_unlock_bh(&x25_list_lock);
307         return s;
308 }
309
310 /*
311  *      Find a unique LCI for a given device.
312  */
313 static unsigned int x25_new_lci(struct x25_neigh *nb)
314 {
315         unsigned int lci = 1;
316         struct sock *sk;
317
318         read_lock_bh(&x25_list_lock);
319
320         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
321                 sock_put(sk);
322                 if (++lci == 4096) {
323                         lci = 0;
324                         break;
325                 }
326         }
327
328         read_unlock_bh(&x25_list_lock);
329         return lci;
330 }
331
332 /*
333  *      Deferred destroy.
334  */
335 void x25_destroy_socket(struct sock *);
336
337 /*
338  *      handler for deferred kills.
339  */
340 static void x25_destroy_timer(unsigned long data)
341 {
342         x25_destroy_socket((struct sock *)data);
343 }
344
345 /*
346  *      This is called from user mode and the timers. Thus it protects itself
347  *      against interrupt users but doesn't worry about being called during
348  *      work. Once it is removed from the queue no interrupt or bottom half
349  *      will touch it and we are (fairly 8-) ) safe.
350  *      Not static as it's used by the timer
351  */
352 void x25_destroy_socket(struct sock *sk)
353 {
354         struct sk_buff *skb;
355
356         sock_hold(sk);
357         lock_sock(sk);
358         x25_stop_heartbeat(sk);
359         x25_stop_timer(sk);
360
361         x25_remove_socket(sk);
362         x25_clear_queues(sk);           /* Flush the queues */
363
364         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
365                 if (skb->sk != sk) {            /* A pending connection */
366                         /*
367                          * Queue the unaccepted socket for death
368                          */
369                         sock_set_flag(skb->sk, SOCK_DEAD);
370                         x25_start_heartbeat(skb->sk);
371                         x25_sk(skb->sk)->state = X25_STATE_0;
372                 }
373
374                 kfree_skb(skb);
375         }
376
377         if (atomic_read(&sk->sk_wmem_alloc) ||
378             atomic_read(&sk->sk_rmem_alloc)) {
379                 /* Defer: outstanding buffers */
380                 sk->sk_timer.expires  = jiffies + 10 * HZ;
381                 sk->sk_timer.function = x25_destroy_timer;
382                 sk->sk_timer.data = (unsigned long)sk;
383                 add_timer(&sk->sk_timer);
384         } else {
385                 /* drop last reference so sock_put will free */
386                 __sock_put(sk);
387         }
388
389         release_sock(sk);
390         sock_put(sk);
391 }
392
393 /*
394  *      Handling for system calls applied via the various interfaces to a
395  *      X.25 socket object.
396  */
397
398 static int x25_setsockopt(struct socket *sock, int level, int optname,
399                           char __user *optval, int optlen)
400 {
401         int opt;
402         struct sock *sk = sock->sk;
403         int rc = -ENOPROTOOPT;
404
405         if (level != SOL_X25 || optname != X25_QBITINCL)
406                 goto out;
407
408         rc = -EINVAL;
409         if (optlen < sizeof(int))
410                 goto out;
411
412         rc = -EFAULT;
413         if (get_user(opt, (int __user *)optval))
414                 goto out;
415
416         x25_sk(sk)->qbitincl = !!opt;
417         rc = 0;
418 out:
419         return rc;
420 }
421
422 static int x25_getsockopt(struct socket *sock, int level, int optname,
423                           char __user *optval, int __user *optlen)
424 {
425         struct sock *sk = sock->sk;
426         int val, len, rc = -ENOPROTOOPT;
427
428         if (level != SOL_X25 || optname != X25_QBITINCL)
429                 goto out;
430
431         rc = -EFAULT;
432         if (get_user(len, optlen))
433                 goto out;
434
435         len = min_t(unsigned int, len, sizeof(int));
436
437         rc = -EINVAL;
438         if (len < 0)
439                 goto out;
440
441         rc = -EFAULT;
442         if (put_user(len, optlen))
443                 goto out;
444
445         val = x25_sk(sk)->qbitincl;
446         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
447 out:
448         return rc;
449 }
450
451 static int x25_listen(struct socket *sock, int backlog)
452 {
453         struct sock *sk = sock->sk;
454         int rc = -EOPNOTSUPP;
455
456         if (sk->sk_state != TCP_LISTEN) {
457                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
458                 sk->sk_max_ack_backlog = backlog;
459                 sk->sk_state           = TCP_LISTEN;
460                 rc = 0;
461         }
462
463         return rc;
464 }
465
466 static struct proto x25_proto = {
467         .name     = "X25",
468         .owner    = THIS_MODULE,
469         .obj_size = sizeof(struct x25_sock),
470 };
471
472 static struct sock *x25_alloc_socket(struct net *net)
473 {
474         struct x25_sock *x25;
475         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
476
477         if (!sk)
478                 goto out;
479
480         sock_init_data(NULL, sk);
481
482         x25 = x25_sk(sk);
483         skb_queue_head_init(&x25->ack_queue);
484         skb_queue_head_init(&x25->fragment_queue);
485         skb_queue_head_init(&x25->interrupt_in_queue);
486         skb_queue_head_init(&x25->interrupt_out_queue);
487 out:
488         return sk;
489 }
490
491 static int x25_create(struct net *net, struct socket *sock, int protocol)
492 {
493         struct sock *sk;
494         struct x25_sock *x25;
495         int rc = -ESOCKTNOSUPPORT;
496
497         if (net != &init_net)
498                 return -EAFNOSUPPORT;
499
500         if (sock->type != SOCK_SEQPACKET || protocol)
501                 goto out;
502
503         rc = -ENOMEM;
504         if ((sk = x25_alloc_socket(net)) == NULL)
505                 goto out;
506
507         x25 = x25_sk(sk);
508
509         sock_init_data(sock, sk);
510
511         x25_init_timers(sk);
512
513         sock->ops    = &x25_proto_ops;
514         sk->sk_protocol = protocol;
515         sk->sk_backlog_rcv = x25_backlog_rcv;
516
517         x25->t21   = sysctl_x25_call_request_timeout;
518         x25->t22   = sysctl_x25_reset_request_timeout;
519         x25->t23   = sysctl_x25_clear_request_timeout;
520         x25->t2    = sysctl_x25_ack_holdback_timeout;
521         x25->state = X25_STATE_0;
522         x25->cudmatchlength = 0;
523         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
524                                                         /* on call accept   */
525
526         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
527         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
528         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
529         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
530         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
531         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
532         x25->dte_facilities.calling_len = 0;
533         x25->dte_facilities.called_len = 0;
534         memset(x25->dte_facilities.called_ae, '\0',
535                         sizeof(x25->dte_facilities.called_ae));
536         memset(x25->dte_facilities.calling_ae, '\0',
537                         sizeof(x25->dte_facilities.calling_ae));
538
539         rc = 0;
540 out:
541         return rc;
542 }
543
544 static struct sock *x25_make_new(struct sock *osk)
545 {
546         struct sock *sk = NULL;
547         struct x25_sock *x25, *ox25;
548
549         if (osk->sk_type != SOCK_SEQPACKET)
550                 goto out;
551
552         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
553                 goto out;
554
555         x25 = x25_sk(sk);
556
557         sk->sk_type        = osk->sk_type;
558         sk->sk_socket      = osk->sk_socket;
559         sk->sk_priority    = osk->sk_priority;
560         sk->sk_protocol    = osk->sk_protocol;
561         sk->sk_rcvbuf      = osk->sk_rcvbuf;
562         sk->sk_sndbuf      = osk->sk_sndbuf;
563         sk->sk_state       = TCP_ESTABLISHED;
564         sk->sk_sleep       = osk->sk_sleep;
565         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
566         sock_copy_flags(sk, osk);
567
568         ox25 = x25_sk(osk);
569         x25->t21        = ox25->t21;
570         x25->t22        = ox25->t22;
571         x25->t23        = ox25->t23;
572         x25->t2         = ox25->t2;
573         x25->facilities = ox25->facilities;
574         x25->qbitincl   = ox25->qbitincl;
575         x25->dte_facilities = ox25->dte_facilities;
576         x25->cudmatchlength = ox25->cudmatchlength;
577         x25->accptapprv = ox25->accptapprv;
578
579         x25_init_timers(sk);
580 out:
581         return sk;
582 }
583
584 static int x25_release(struct socket *sock)
585 {
586         struct sock *sk = sock->sk;
587         struct x25_sock *x25;
588
589         if (!sk)
590                 goto out;
591
592         x25 = x25_sk(sk);
593
594         switch (x25->state) {
595
596                 case X25_STATE_0:
597                 case X25_STATE_2:
598                         x25_disconnect(sk, 0, 0, 0);
599                         x25_destroy_socket(sk);
600                         goto out;
601
602                 case X25_STATE_1:
603                 case X25_STATE_3:
604                 case X25_STATE_4:
605                         x25_clear_queues(sk);
606                         x25_write_internal(sk, X25_CLEAR_REQUEST);
607                         x25_start_t23timer(sk);
608                         x25->state = X25_STATE_2;
609                         sk->sk_state    = TCP_CLOSE;
610                         sk->sk_shutdown |= SEND_SHUTDOWN;
611                         sk->sk_state_change(sk);
612                         sock_set_flag(sk, SOCK_DEAD);
613                         sock_set_flag(sk, SOCK_DESTROY);
614                         break;
615         }
616
617         sock->sk        = NULL;
618         sk->sk_socket   = NULL; /* Not used, but we should do this */
619 out:
620         return 0;
621 }
622
623 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
624 {
625         struct sock *sk = sock->sk;
626         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
627
628         if (!sock_flag(sk, SOCK_ZAPPED) ||
629             addr_len != sizeof(struct sockaddr_x25) ||
630             addr->sx25_family != AF_X25)
631                 return -EINVAL;
632
633         x25_sk(sk)->source_addr = addr->sx25_addr;
634         x25_insert_socket(sk);
635         sock_reset_flag(sk, SOCK_ZAPPED);
636         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
637
638         return 0;
639 }
640
641 static int x25_wait_for_connection_establishment(struct sock *sk)
642 {
643         DECLARE_WAITQUEUE(wait, current);
644         int rc;
645
646         add_wait_queue_exclusive(sk->sk_sleep, &wait);
647         for (;;) {
648                 __set_current_state(TASK_INTERRUPTIBLE);
649                 rc = -ERESTARTSYS;
650                 if (signal_pending(current))
651                         break;
652                 rc = sock_error(sk);
653                 if (rc) {
654                         sk->sk_socket->state = SS_UNCONNECTED;
655                         break;
656                 }
657                 rc = 0;
658                 if (sk->sk_state != TCP_ESTABLISHED) {
659                         release_sock(sk);
660                         schedule();
661                         lock_sock(sk);
662                 } else
663                         break;
664         }
665         __set_current_state(TASK_RUNNING);
666         remove_wait_queue(sk->sk_sleep, &wait);
667         return rc;
668 }
669
670 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
671                        int addr_len, int flags)
672 {
673         struct sock *sk = sock->sk;
674         struct x25_sock *x25 = x25_sk(sk);
675         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
676         struct x25_route *rt;
677         int rc = 0;
678
679         lock_sock(sk);
680         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
681                 sock->state = SS_CONNECTED;
682                 goto out; /* Connect completed during a ERESTARTSYS event */
683         }
684
685         rc = -ECONNREFUSED;
686         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
687                 sock->state = SS_UNCONNECTED;
688                 goto out;
689         }
690
691         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
692         if (sk->sk_state == TCP_ESTABLISHED)
693                 goto out;
694
695         sk->sk_state   = TCP_CLOSE;
696         sock->state = SS_UNCONNECTED;
697
698         rc = -EINVAL;
699         if (addr_len != sizeof(struct sockaddr_x25) ||
700             addr->sx25_family != AF_X25)
701                 goto out;
702
703         rc = -ENETUNREACH;
704         rt = x25_get_route(&addr->sx25_addr);
705         if (!rt)
706                 goto out;
707
708         x25->neighbour = x25_get_neigh(rt->dev);
709         if (!x25->neighbour)
710                 goto out_put_route;
711
712         x25_limit_facilities(&x25->facilities, x25->neighbour);
713
714         x25->lci = x25_new_lci(x25->neighbour);
715         if (!x25->lci)
716                 goto out_put_neigh;
717
718         rc = -EINVAL;
719         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
720                 goto out_put_neigh;
721
722         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
723                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
724
725         x25->dest_addr = addr->sx25_addr;
726
727         /* Move to connecting socket, start sending Connect Requests */
728         sock->state   = SS_CONNECTING;
729         sk->sk_state  = TCP_SYN_SENT;
730
731         x25->state = X25_STATE_1;
732
733         x25_write_internal(sk, X25_CALL_REQUEST);
734
735         x25_start_heartbeat(sk);
736         x25_start_t21timer(sk);
737
738         /* Now the loop */
739         rc = -EINPROGRESS;
740         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
741                 goto out_put_neigh;
742
743         rc = x25_wait_for_connection_establishment(sk);
744         if (rc)
745                 goto out_put_neigh;
746
747         sock->state = SS_CONNECTED;
748         rc = 0;
749 out_put_neigh:
750         if (rc)
751                 x25_neigh_put(x25->neighbour);
752 out_put_route:
753         x25_route_put(rt);
754 out:
755         release_sock(sk);
756         return rc;
757 }
758
759 static int x25_wait_for_data(struct sock *sk, long timeout)
760 {
761         DECLARE_WAITQUEUE(wait, current);
762         int rc = 0;
763
764         add_wait_queue_exclusive(sk->sk_sleep, &wait);
765         for (;;) {
766                 __set_current_state(TASK_INTERRUPTIBLE);
767                 if (sk->sk_shutdown & RCV_SHUTDOWN)
768                         break;
769                 rc = -ERESTARTSYS;
770                 if (signal_pending(current))
771                         break;
772                 rc = -EAGAIN;
773                 if (!timeout)
774                         break;
775                 rc = 0;
776                 if (skb_queue_empty(&sk->sk_receive_queue)) {
777                         release_sock(sk);
778                         timeout = schedule_timeout(timeout);
779                         lock_sock(sk);
780                 } else
781                         break;
782         }
783         __set_current_state(TASK_RUNNING);
784         remove_wait_queue(sk->sk_sleep, &wait);
785         return rc;
786 }
787
788 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
789 {
790         struct sock *sk = sock->sk;
791         struct sock *newsk;
792         struct sk_buff *skb;
793         int rc = -EINVAL;
794
795         if (!sk || sk->sk_state != TCP_LISTEN)
796                 goto out;
797
798         rc = -EOPNOTSUPP;
799         if (sk->sk_type != SOCK_SEQPACKET)
800                 goto out;
801
802         lock_sock(sk);
803         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
804         if (rc)
805                 goto out2;
806         skb = skb_dequeue(&sk->sk_receive_queue);
807         rc = -EINVAL;
808         if (!skb->sk)
809                 goto out2;
810         newsk            = skb->sk;
811         newsk->sk_socket = newsock;
812         newsk->sk_sleep  = &newsock->wait;
813
814         /* Now attach up the new socket */
815         skb->sk = NULL;
816         kfree_skb(skb);
817         sk->sk_ack_backlog--;
818         newsock->sk    = newsk;
819         newsock->state = SS_CONNECTED;
820         rc = 0;
821 out2:
822         release_sock(sk);
823 out:
824         return rc;
825 }
826
827 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
828                        int *uaddr_len, int peer)
829 {
830         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
831         struct sock *sk = sock->sk;
832         struct x25_sock *x25 = x25_sk(sk);
833
834         if (peer) {
835                 if (sk->sk_state != TCP_ESTABLISHED)
836                         return -ENOTCONN;
837                 sx25->sx25_addr = x25->dest_addr;
838         } else
839                 sx25->sx25_addr = x25->source_addr;
840
841         sx25->sx25_family = AF_X25;
842         *uaddr_len = sizeof(*sx25);
843
844         return 0;
845 }
846
847 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
848                         unsigned int lci)
849 {
850         struct sock *sk;
851         struct sock *make;
852         struct x25_sock *makex25;
853         struct x25_address source_addr, dest_addr;
854         struct x25_facilities facilities;
855         struct x25_dte_facilities dte_facilities;
856         int len, addr_len, rc;
857
858         /*
859          *      Remove the LCI and frame type.
860          */
861         skb_pull(skb, X25_STD_MIN_LEN);
862
863         /*
864          *      Extract the X.25 addresses and convert them to ASCII strings,
865          *      and remove them.
866          */
867         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
868         skb_pull(skb, addr_len);
869
870         /*
871          *      Get the length of the facilities, skip past them for the moment
872          *      get the call user data because this is needed to determine
873          *      the correct listener
874          */
875         len = skb->data[0] + 1;
876         skb_pull(skb,len);
877
878         /*
879          *      Find a listener for the particular address/cud pair.
880          */
881         sk = x25_find_listener(&source_addr,skb);
882         skb_push(skb,len);
883
884         if (sk != NULL && sk_acceptq_is_full(sk)) {
885                 goto out_sock_put;
886         }
887
888         /*
889          *      We dont have any listeners for this incoming call.
890          *      Try forwarding it.
891          */
892         if (sk == NULL) {
893                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
894                 if (sysctl_x25_forward &&
895                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
896                 {
897                         /* Call was forwarded, dont process it any more */
898                         kfree_skb(skb);
899                         rc = 1;
900                         goto out;
901                 } else {
902                         /* No listeners, can't forward, clear the call */
903                         goto out_clear_request;
904                 }
905         }
906
907         /*
908          *      Try to reach a compromise on the requested facilities.
909          */
910         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
911         if (len == -1)
912                 goto out_sock_put;
913
914         /*
915          * current neighbour/link might impose additional limits
916          * on certain facilties
917          */
918
919         x25_limit_facilities(&facilities, nb);
920
921         /*
922          *      Try to create a new socket.
923          */
924         make = x25_make_new(sk);
925         if (!make)
926                 goto out_sock_put;
927
928         /*
929          *      Remove the facilities
930          */
931         skb_pull(skb, len);
932
933         skb->sk     = make;
934         make->sk_state = TCP_ESTABLISHED;
935
936         makex25 = x25_sk(make);
937         makex25->lci           = lci;
938         makex25->dest_addr     = dest_addr;
939         makex25->source_addr   = source_addr;
940         makex25->neighbour     = nb;
941         makex25->facilities    = facilities;
942         makex25->dte_facilities= dte_facilities;
943         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
944         /* ensure no reverse facil on accept */
945         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
946         /* ensure no calling address extension on accept */
947         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
948         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
949
950         /* Normally all calls are accepted immediatly */
951         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
952                 x25_write_internal(make, X25_CALL_ACCEPTED);
953                 makex25->state = X25_STATE_3;
954         }
955
956         /*
957          *      Incoming Call User Data.
958          */
959         if (skb->len >= 0) {
960                 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
961                 makex25->calluserdata.cudlength = skb->len;
962         }
963
964         sk->sk_ack_backlog++;
965
966         x25_insert_socket(make);
967
968         skb_queue_head(&sk->sk_receive_queue, skb);
969
970         x25_start_heartbeat(make);
971
972         if (!sock_flag(sk, SOCK_DEAD))
973                 sk->sk_data_ready(sk, skb->len);
974         rc = 1;
975         sock_put(sk);
976 out:
977         return rc;
978 out_sock_put:
979         sock_put(sk);
980 out_clear_request:
981         rc = 0;
982         x25_transmit_clear_request(nb, lci, 0x01);
983         goto out;
984 }
985
986 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
987                        struct msghdr *msg, size_t len)
988 {
989         struct sock *sk = sock->sk;
990         struct x25_sock *x25 = x25_sk(sk);
991         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
992         struct sockaddr_x25 sx25;
993         struct sk_buff *skb;
994         unsigned char *asmptr;
995         int noblock = msg->msg_flags & MSG_DONTWAIT;
996         size_t size;
997         int qbit = 0, rc = -EINVAL;
998
999         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1000                 goto out;
1001
1002         /* we currently don't support segmented records at the user interface */
1003         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1004                 goto out;
1005
1006         rc = -EADDRNOTAVAIL;
1007         if (sock_flag(sk, SOCK_ZAPPED))
1008                 goto out;
1009
1010         rc = -EPIPE;
1011         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1012                 send_sig(SIGPIPE, current, 0);
1013                 goto out;
1014         }
1015
1016         rc = -ENETUNREACH;
1017         if (!x25->neighbour)
1018                 goto out;
1019
1020         if (usx25) {
1021                 rc = -EINVAL;
1022                 if (msg->msg_namelen < sizeof(sx25))
1023                         goto out;
1024                 memcpy(&sx25, usx25, sizeof(sx25));
1025                 rc = -EISCONN;
1026                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1027                         goto out;
1028                 rc = -EINVAL;
1029                 if (sx25.sx25_family != AF_X25)
1030                         goto out;
1031         } else {
1032                 /*
1033                  *      FIXME 1003.1g - if the socket is like this because
1034                  *      it has become closed (not started closed) we ought
1035                  *      to SIGPIPE, EPIPE;
1036                  */
1037                 rc = -ENOTCONN;
1038                 if (sk->sk_state != TCP_ESTABLISHED)
1039                         goto out;
1040
1041                 sx25.sx25_family = AF_X25;
1042                 sx25.sx25_addr   = x25->dest_addr;
1043         }
1044
1045         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1046
1047         /* Build a packet */
1048         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1049
1050         if ((msg->msg_flags & MSG_OOB) && len > 32)
1051                 len = 32;
1052
1053         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1054
1055         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1056         if (!skb)
1057                 goto out;
1058         X25_SKB_CB(skb)->flags = msg->msg_flags;
1059
1060         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1061
1062         /*
1063          *      Put the data on the end
1064          */
1065         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1066
1067         skb_reset_transport_header(skb);
1068         skb_put(skb, len);
1069
1070         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1071         if (rc)
1072                 goto out_kfree_skb;
1073
1074         /*
1075          *      If the Q BIT Include socket option is in force, the first
1076          *      byte of the user data is the logical value of the Q Bit.
1077          */
1078         if (x25->qbitincl) {
1079                 qbit = skb->data[0];
1080                 skb_pull(skb, 1);
1081         }
1082
1083         /*
1084          *      Push down the X.25 header
1085          */
1086         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1087
1088         if (msg->msg_flags & MSG_OOB) {
1089                 if (x25->neighbour->extended) {
1090                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1091                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1092                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1093                         *asmptr++ = X25_INTERRUPT;
1094                 } else {
1095                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1096                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1097                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1098                         *asmptr++ = X25_INTERRUPT;
1099                 }
1100         } else {
1101                 if (x25->neighbour->extended) {
1102                         /* Build an Extended X.25 header */
1103                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1104                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1105                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1106                         *asmptr++ = X25_DATA;
1107                         *asmptr++ = X25_DATA;
1108                 } else {
1109                         /* Build an Standard X.25 header */
1110                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1111                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1112                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1113                         *asmptr++ = X25_DATA;
1114                 }
1115
1116                 if (qbit)
1117                         skb->data[0] |= X25_Q_BIT;
1118         }
1119
1120         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1121         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1122
1123         rc = -ENOTCONN;
1124         if (sk->sk_state != TCP_ESTABLISHED)
1125                 goto out_kfree_skb;
1126
1127         if (msg->msg_flags & MSG_OOB)
1128                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1129         else {
1130                 len = x25_output(sk, skb);
1131                 if (len < 0)
1132                         kfree_skb(skb);
1133                 else if (x25->qbitincl)
1134                         len++;
1135         }
1136
1137         /*
1138          * lock_sock() is currently only used to serialize this x25_kick()
1139          * against input-driven x25_kick() calls. It currently only blocks
1140          * incoming packets for this socket and does not protect against
1141          * any other socket state changes and is not called from anywhere
1142          * else. As x25_kick() cannot block and as long as all socket
1143          * operations are BKL-wrapped, we don't need take to care about
1144          * purging the backlog queue in x25_release().
1145          *
1146          * Using lock_sock() to protect all socket operations entirely
1147          * (and making the whole x25 stack SMP aware) unfortunately would
1148          * require major changes to {send,recv}msg and skb allocation methods.
1149          * -> 2.5 ;)
1150          */
1151         lock_sock(sk);
1152         x25_kick(sk);
1153         release_sock(sk);
1154         rc = len;
1155 out:
1156         return rc;
1157 out_kfree_skb:
1158         kfree_skb(skb);
1159         goto out;
1160 }
1161
1162
1163 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1164                        struct msghdr *msg, size_t size,
1165                        int flags)
1166 {
1167         struct sock *sk = sock->sk;
1168         struct x25_sock *x25 = x25_sk(sk);
1169         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1170         size_t copied;
1171         int qbit;
1172         struct sk_buff *skb;
1173         unsigned char *asmptr;
1174         int rc = -ENOTCONN;
1175
1176         /*
1177          * This works for seqpacket too. The receiver has ordered the queue for
1178          * us! We do one quick check first though
1179          */
1180         if (sk->sk_state != TCP_ESTABLISHED)
1181                 goto out;
1182
1183         if (flags & MSG_OOB) {
1184                 rc = -EINVAL;
1185                 if (sock_flag(sk, SOCK_URGINLINE) ||
1186                     !skb_peek(&x25->interrupt_in_queue))
1187                         goto out;
1188
1189                 skb = skb_dequeue(&x25->interrupt_in_queue);
1190
1191                 skb_pull(skb, X25_STD_MIN_LEN);
1192
1193                 /*
1194                  *      No Q bit information on Interrupt data.
1195                  */
1196                 if (x25->qbitincl) {
1197                         asmptr  = skb_push(skb, 1);
1198                         *asmptr = 0x00;
1199                 }
1200
1201                 msg->msg_flags |= MSG_OOB;
1202         } else {
1203                 /* Now we can treat all alike */
1204                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1205                                         flags & MSG_DONTWAIT, &rc);
1206                 if (!skb)
1207                         goto out;
1208
1209                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1210
1211                 skb_pull(skb, x25->neighbour->extended ?
1212                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1213
1214                 if (x25->qbitincl) {
1215                         asmptr  = skb_push(skb, 1);
1216                         *asmptr = qbit;
1217                 }
1218         }
1219
1220         skb_reset_transport_header(skb);
1221         copied = skb->len;
1222
1223         if (copied > size) {
1224                 copied = size;
1225                 msg->msg_flags |= MSG_TRUNC;
1226         }
1227
1228         /* Currently, each datagram always contains a complete record */
1229         msg->msg_flags |= MSG_EOR;
1230
1231         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1232         if (rc)
1233                 goto out_free_dgram;
1234
1235         if (sx25) {
1236                 sx25->sx25_family = AF_X25;
1237                 sx25->sx25_addr   = x25->dest_addr;
1238         }
1239
1240         msg->msg_namelen = sizeof(struct sockaddr_x25);
1241
1242         lock_sock(sk);
1243         x25_check_rbuf(sk);
1244         release_sock(sk);
1245         rc = copied;
1246 out_free_dgram:
1247         skb_free_datagram(sk, skb);
1248 out:
1249         return rc;
1250 }
1251
1252
1253 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1254 {
1255         struct sock *sk = sock->sk;
1256         struct x25_sock *x25 = x25_sk(sk);
1257         void __user *argp = (void __user *)arg;
1258         int rc;
1259
1260         switch (cmd) {
1261                 case TIOCOUTQ: {
1262                         int amount = sk->sk_sndbuf -
1263                                      atomic_read(&sk->sk_wmem_alloc);
1264                         if (amount < 0)
1265                                 amount = 0;
1266                         rc = put_user(amount, (unsigned int __user *)argp);
1267                         break;
1268                 }
1269
1270                 case TIOCINQ: {
1271                         struct sk_buff *skb;
1272                         int amount = 0;
1273                         /*
1274                          * These two are safe on a single CPU system as
1275                          * only user tasks fiddle here
1276                          */
1277                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1278                                 amount = skb->len;
1279                         rc = put_user(amount, (unsigned int __user *)argp);
1280                         break;
1281                 }
1282
1283                 case SIOCGSTAMP:
1284                         rc = -EINVAL;
1285                         if (sk)
1286                                 rc = sock_get_timestamp(sk,
1287                                                 (struct timeval __user *)argp);
1288                         break;
1289                 case SIOCGSTAMPNS:
1290                         rc = -EINVAL;
1291                         if (sk)
1292                                 rc = sock_get_timestampns(sk,
1293                                                 (struct timespec __user *)argp);
1294                         break;
1295                 case SIOCGIFADDR:
1296                 case SIOCSIFADDR:
1297                 case SIOCGIFDSTADDR:
1298                 case SIOCSIFDSTADDR:
1299                 case SIOCGIFBRDADDR:
1300                 case SIOCSIFBRDADDR:
1301                 case SIOCGIFNETMASK:
1302                 case SIOCSIFNETMASK:
1303                 case SIOCGIFMETRIC:
1304                 case SIOCSIFMETRIC:
1305                         rc = -EINVAL;
1306                         break;
1307                 case SIOCADDRT:
1308                 case SIOCDELRT:
1309                         rc = -EPERM;
1310                         if (!capable(CAP_NET_ADMIN))
1311                                 break;
1312                         rc = x25_route_ioctl(cmd, argp);
1313                         break;
1314                 case SIOCX25GSUBSCRIP:
1315                         rc = x25_subscr_ioctl(cmd, argp);
1316                         break;
1317                 case SIOCX25SSUBSCRIP:
1318                         rc = -EPERM;
1319                         if (!capable(CAP_NET_ADMIN))
1320                                 break;
1321                         rc = x25_subscr_ioctl(cmd, argp);
1322                         break;
1323                 case SIOCX25GFACILITIES: {
1324                         struct x25_facilities fac = x25->facilities;
1325                         rc = copy_to_user(argp, &fac,
1326                                           sizeof(fac)) ? -EFAULT : 0;
1327                         break;
1328                 }
1329
1330                 case SIOCX25SFACILITIES: {
1331                         struct x25_facilities facilities;
1332                         rc = -EFAULT;
1333                         if (copy_from_user(&facilities, argp,
1334                                            sizeof(facilities)))
1335                                 break;
1336                         rc = -EINVAL;
1337                         if (sk->sk_state != TCP_LISTEN &&
1338                             sk->sk_state != TCP_CLOSE)
1339                                 break;
1340                         if (facilities.pacsize_in < X25_PS16 ||
1341                             facilities.pacsize_in > X25_PS4096)
1342                                 break;
1343                         if (facilities.pacsize_out < X25_PS16 ||
1344                             facilities.pacsize_out > X25_PS4096)
1345                                 break;
1346                         if (facilities.winsize_in < 1 ||
1347                             facilities.winsize_in > 127)
1348                                 break;
1349                         if (facilities.throughput < 0x03 ||
1350                             facilities.throughput > 0xDD)
1351                                 break;
1352                         if (facilities.reverse &&
1353                                 (facilities.reverse | 0x81)!= 0x81)
1354                                 break;
1355                         x25->facilities = facilities;
1356                         rc = 0;
1357                         break;
1358                 }
1359
1360                 case SIOCX25GDTEFACILITIES: {
1361                         rc = copy_to_user(argp, &x25->dte_facilities,
1362                                                 sizeof(x25->dte_facilities));
1363                         if (rc)
1364                                 rc = -EFAULT;
1365                         break;
1366                 }
1367
1368                 case SIOCX25SDTEFACILITIES: {
1369                         struct x25_dte_facilities dtefacs;
1370                         rc = -EFAULT;
1371                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1372                                 break;
1373                         rc = -EINVAL;
1374                         if (sk->sk_state != TCP_LISTEN &&
1375                                         sk->sk_state != TCP_CLOSE)
1376                                 break;
1377                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1378                                 break;
1379                         if (dtefacs.calling_ae == NULL)
1380                                 break;
1381                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1382                                 break;
1383                         if (dtefacs.called_ae == NULL)
1384                                 break;
1385                         x25->dte_facilities = dtefacs;
1386                         rc = 0;
1387                         break;
1388                 }
1389
1390                 case SIOCX25GCALLUSERDATA: {
1391                         struct x25_calluserdata cud = x25->calluserdata;
1392                         rc = copy_to_user(argp, &cud,
1393                                           sizeof(cud)) ? -EFAULT : 0;
1394                         break;
1395                 }
1396
1397                 case SIOCX25SCALLUSERDATA: {
1398                         struct x25_calluserdata calluserdata;
1399
1400                         rc = -EFAULT;
1401                         if (copy_from_user(&calluserdata, argp,
1402                                            sizeof(calluserdata)))
1403                                 break;
1404                         rc = -EINVAL;
1405                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1406                                 break;
1407                         x25->calluserdata = calluserdata;
1408                         rc = 0;
1409                         break;
1410                 }
1411
1412                 case SIOCX25GCAUSEDIAG: {
1413                         struct x25_causediag causediag;
1414                         causediag = x25->causediag;
1415                         rc = copy_to_user(argp, &causediag,
1416                                           sizeof(causediag)) ? -EFAULT : 0;
1417                         break;
1418                 }
1419
1420                 case SIOCX25SCUDMATCHLEN: {
1421                         struct x25_subaddr sub_addr;
1422                         rc = -EINVAL;
1423                         if(sk->sk_state != TCP_CLOSE)
1424                                 break;
1425                         rc = -EFAULT;
1426                         if (copy_from_user(&sub_addr, argp,
1427                                         sizeof(sub_addr)))
1428                                 break;
1429                         rc = -EINVAL;
1430                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1431                                 break;
1432                         x25->cudmatchlength = sub_addr.cudmatchlength;
1433                         rc = 0;
1434                         break;
1435                 }
1436
1437                 case SIOCX25CALLACCPTAPPRV: {
1438                         rc = -EINVAL;
1439                         if (sk->sk_state != TCP_CLOSE)
1440                                 break;
1441                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1442                         rc = 0;
1443                         break;
1444                 }
1445
1446                 case SIOCX25SENDCALLACCPT:  {
1447                         rc = -EINVAL;
1448                         if (sk->sk_state != TCP_ESTABLISHED)
1449                                 break;
1450                         if (x25->accptapprv)    /* must call accptapprv above */
1451                                 break;
1452                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1453                         x25->state = X25_STATE_3;
1454                         rc = 0;
1455                         break;
1456                 }
1457
1458                 default:
1459                         rc = -ENOIOCTLCMD;
1460                         break;
1461         }
1462
1463         return rc;
1464 }
1465
1466 static struct net_proto_family x25_family_ops = {
1467         .family =       AF_X25,
1468         .create =       x25_create,
1469         .owner  =       THIS_MODULE,
1470 };
1471
1472 #ifdef CONFIG_COMPAT
1473 static int compat_x25_subscr_ioctl(unsigned int cmd,
1474                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1475 {
1476         struct compat_x25_subscrip_struct x25_subscr;
1477         struct x25_neigh *nb;
1478         struct net_device *dev;
1479         int rc = -EINVAL;
1480
1481         rc = -EFAULT;
1482         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1483                 goto out;
1484
1485         rc = -EINVAL;
1486         dev = x25_dev_get(x25_subscr.device);
1487         if (dev == NULL)
1488                 goto out;
1489
1490         nb = x25_get_neigh(dev);
1491         if (nb == NULL)
1492                 goto out_dev_put;
1493
1494         dev_put(dev);
1495
1496         if (cmd == SIOCX25GSUBSCRIP) {
1497                 x25_subscr.extended = nb->extended;
1498                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1499                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1500                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1501         } else {
1502                 rc = -EINVAL;
1503                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1504                         rc = 0;
1505                         nb->extended = x25_subscr.extended;
1506                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1507                 }
1508         }
1509         x25_neigh_put(nb);
1510 out:
1511         return rc;
1512 out_dev_put:
1513         dev_put(dev);
1514         goto out;
1515 }
1516
1517 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1518                                 unsigned long arg)
1519 {
1520         void __user *argp = compat_ptr(arg);
1521         struct sock *sk = sock->sk;
1522
1523         int rc = -ENOIOCTLCMD;
1524
1525         switch(cmd) {
1526         case TIOCOUTQ:
1527         case TIOCINQ:
1528                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1529                 break;
1530         case SIOCGSTAMP:
1531                 rc = -EINVAL;
1532                 if (sk)
1533                         rc = compat_sock_get_timestamp(sk,
1534                                         (struct timeval __user*)argp);
1535                 break;
1536         case SIOCGSTAMPNS:
1537                 rc = -EINVAL;
1538                 if (sk)
1539                         rc = compat_sock_get_timestampns(sk,
1540                                         (struct timespec __user*)argp);
1541                 break;
1542         case SIOCGIFADDR:
1543         case SIOCSIFADDR:
1544         case SIOCGIFDSTADDR:
1545         case SIOCSIFDSTADDR:
1546         case SIOCGIFBRDADDR:
1547         case SIOCSIFBRDADDR:
1548         case SIOCGIFNETMASK:
1549         case SIOCSIFNETMASK:
1550         case SIOCGIFMETRIC:
1551         case SIOCSIFMETRIC:
1552                 rc = -EINVAL;
1553                 break;
1554         case SIOCADDRT:
1555         case SIOCDELRT:
1556                 rc = -EPERM;
1557                 if (!capable(CAP_NET_ADMIN))
1558                         break;
1559                 rc = x25_route_ioctl(cmd, argp);
1560                 break;
1561         case SIOCX25GSUBSCRIP:
1562                 rc = compat_x25_subscr_ioctl(cmd, argp);
1563                 break;
1564         case SIOCX25SSUBSCRIP:
1565                 rc = -EPERM;
1566                 if (!capable(CAP_NET_ADMIN))
1567                         break;
1568                 rc = compat_x25_subscr_ioctl(cmd, argp);
1569                 break;
1570         case SIOCX25GFACILITIES:
1571         case SIOCX25SFACILITIES:
1572         case SIOCX25GDTEFACILITIES:
1573         case SIOCX25SDTEFACILITIES:
1574         case SIOCX25GCALLUSERDATA:
1575         case SIOCX25SCALLUSERDATA:
1576         case SIOCX25GCAUSEDIAG:
1577         case SIOCX25SCUDMATCHLEN:
1578         case SIOCX25CALLACCPTAPPRV:
1579         case SIOCX25SENDCALLACCPT:
1580                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1581                 break;
1582         default:
1583                 rc = -ENOIOCTLCMD;
1584                 break;
1585         }
1586         return rc;
1587 }
1588 #endif
1589
1590 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1591         .family =       AF_X25,
1592         .owner =        THIS_MODULE,
1593         .release =      x25_release,
1594         .bind =         x25_bind,
1595         .connect =      x25_connect,
1596         .socketpair =   sock_no_socketpair,
1597         .accept =       x25_accept,
1598         .getname =      x25_getname,
1599         .poll =         datagram_poll,
1600         .ioctl =        x25_ioctl,
1601 #ifdef CONFIG_COMPAT
1602         .compat_ioctl = compat_x25_ioctl,
1603 #endif
1604         .listen =       x25_listen,
1605         .shutdown =     sock_no_shutdown,
1606         .setsockopt =   x25_setsockopt,
1607         .getsockopt =   x25_getsockopt,
1608         .sendmsg =      x25_sendmsg,
1609         .recvmsg =      x25_recvmsg,
1610         .mmap =         sock_no_mmap,
1611         .sendpage =     sock_no_sendpage,
1612 };
1613
1614 SOCKOPS_WRAP(x25_proto, AF_X25);
1615
1616 static struct packet_type x25_packet_type = {
1617         .type = __constant_htons(ETH_P_X25),
1618         .func = x25_lapb_receive_frame,
1619 };
1620
1621 static struct notifier_block x25_dev_notifier = {
1622         .notifier_call = x25_device_event,
1623 };
1624
1625 void x25_kill_by_neigh(struct x25_neigh *nb)
1626 {
1627         struct sock *s;
1628         struct hlist_node *node;
1629
1630         write_lock_bh(&x25_list_lock);
1631
1632         sk_for_each(s, node, &x25_list)
1633                 if (x25_sk(s)->neighbour == nb)
1634                         x25_disconnect(s, ENETUNREACH, 0, 0);
1635
1636         write_unlock_bh(&x25_list_lock);
1637
1638         /* Remove any related forwards */
1639         x25_clear_forward_by_dev(nb->dev);
1640 }
1641
1642 static int __init x25_init(void)
1643 {
1644         int rc = proto_register(&x25_proto, 0);
1645
1646         if (rc != 0)
1647                 goto out;
1648
1649         sock_register(&x25_family_ops);
1650
1651         dev_add_pack(&x25_packet_type);
1652
1653         register_netdevice_notifier(&x25_dev_notifier);
1654
1655         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1656
1657 #ifdef CONFIG_SYSCTL
1658         x25_register_sysctl();
1659 #endif
1660         x25_proc_init();
1661 out:
1662         return rc;
1663 }
1664 module_init(x25_init);
1665
1666 static void __exit x25_exit(void)
1667 {
1668         x25_proc_exit();
1669         x25_link_free();
1670         x25_route_free();
1671
1672 #ifdef CONFIG_SYSCTL
1673         x25_unregister_sysctl();
1674 #endif
1675
1676         unregister_netdevice_notifier(&x25_dev_notifier);
1677
1678         dev_remove_pack(&x25_packet_type);
1679
1680         sock_unregister(AF_X25);
1681         proto_unregister(&x25_proto);
1682 }
1683 module_exit(x25_exit);
1684
1685 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1686 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1687 MODULE_LICENSE("GPL");
1688 MODULE_ALIAS_NETPROTO(PF_X25);