38e235f61e27028c1db80c36608fef1aae069c0e
[linux-2.6.git] / net / x25 / af_x25.c
1 /*
2  *      X.25 Packet Layer release 002
3  *
4  *      This is ALPHA test software. This code may break your machine,
5  *      randomly fail to work with new releases, misbehave and/or generally
6  *      screw up. It might even work.
7  *
8  *      This code REQUIRES 2.1.15 or higher
9  *
10  *      This module:
11  *              This module is free software; you can redistribute it and/or
12  *              modify it under the terms of the GNU General Public License
13  *              as published by the Free Software Foundation; either version
14  *              2 of the License, or (at your option) any later version.
15  *
16  *      History
17  *      X.25 001        Jonathan Naylor Started coding.
18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
19  *                                      New timer architecture.
20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
22  *                                        facilities negotiation and increased
23  *                                        the throughput upper limit.
24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
26  *                                      Fixed x25_output() related skb leakage.
27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31  *                                      x25_proc.c, using seq_file
32  *      2005-04-02      Shaun Pereira   Selective sub address matching
33  *                                      with call user data
34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
35  *                                      response
36  */
37
38 #include <linux/module.h>
39 #include <linux/capability.h>
40 #include <linux/errno.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/smp_lock.h>
44 #include <linux/timer.h>
45 #include <linux/string.h>
46 #include <linux/net.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_arp.h>
49 #include <linux/skbuff.h>
50 #include <net/sock.h>
51 #include <net/tcp_states.h>
52 #include <asm/uaccess.h>
53 #include <linux/fcntl.h>
54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
55 #include <linux/notifier.h>
56 #include <linux/init.h>
57 #include <linux/compat.h>
58
59 #include <net/x25.h>
60 #include <net/compat.h>
61
62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
63 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
64 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
65 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
66 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
67 int sysctl_x25_forward                 = 0;
68
69 HLIST_HEAD(x25_list);
70 DEFINE_RWLOCK(x25_list_lock);
71
72 static const struct proto_ops x25_proto_ops;
73
74 static struct x25_address null_x25_address = {"               "};
75
76 #ifdef CONFIG_COMPAT
77 struct compat_x25_subscrip_struct {
78         char device[200-sizeof(compat_ulong_t)];
79         compat_ulong_t global_facil_mask;
80         compat_uint_t extended;
81 };
82 #endif
83
84 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
85                   struct x25_address *calling_addr)
86 {
87         unsigned int called_len, calling_len;
88         char *called, *calling;
89         unsigned int i;
90
91         called_len  = (*p >> 0) & 0x0F;
92         calling_len = (*p >> 4) & 0x0F;
93
94         called  = called_addr->x25_addr;
95         calling = calling_addr->x25_addr;
96         p++;
97
98         for (i = 0; i < (called_len + calling_len); i++) {
99                 if (i < called_len) {
100                         if (i % 2 != 0) {
101                                 *called++ = ((*p >> 0) & 0x0F) + '0';
102                                 p++;
103                         } else {
104                                 *called++ = ((*p >> 4) & 0x0F) + '0';
105                         }
106                 } else {
107                         if (i % 2 != 0) {
108                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
109                                 p++;
110                         } else {
111                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
112                         }
113                 }
114         }
115
116         *called = *calling = '\0';
117
118         return 1 + (called_len + calling_len + 1) / 2;
119 }
120
121 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
122                   struct x25_address *calling_addr)
123 {
124         unsigned int called_len, calling_len;
125         char *called, *calling;
126         int i;
127
128         called  = called_addr->x25_addr;
129         calling = calling_addr->x25_addr;
130
131         called_len  = strlen(called);
132         calling_len = strlen(calling);
133
134         *p++ = (calling_len << 4) | (called_len << 0);
135
136         for (i = 0; i < (called_len + calling_len); i++) {
137                 if (i < called_len) {
138                         if (i % 2 != 0) {
139                                 *p |= (*called++ - '0') << 0;
140                                 p++;
141                         } else {
142                                 *p = 0x00;
143                                 *p |= (*called++ - '0') << 4;
144                         }
145                 } else {
146                         if (i % 2 != 0) {
147                                 *p |= (*calling++ - '0') << 0;
148                                 p++;
149                         } else {
150                                 *p = 0x00;
151                                 *p |= (*calling++ - '0') << 4;
152                         }
153                 }
154         }
155
156         return 1 + (called_len + calling_len + 1) / 2;
157 }
158
159 /*
160  *      Socket removal during an interrupt is now safe.
161  */
162 static void x25_remove_socket(struct sock *sk)
163 {
164         write_lock_bh(&x25_list_lock);
165         sk_del_node_init(sk);
166         write_unlock_bh(&x25_list_lock);
167 }
168
169 /*
170  *      Kill all bound sockets on a dropped device.
171  */
172 static void x25_kill_by_device(struct net_device *dev)
173 {
174         struct sock *s;
175         struct hlist_node *node;
176
177         write_lock_bh(&x25_list_lock);
178
179         sk_for_each(s, node, &x25_list)
180                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
181                         x25_disconnect(s, ENETUNREACH, 0, 0);
182
183         write_unlock_bh(&x25_list_lock);
184 }
185
186 /*
187  *      Handle device status changes.
188  */
189 static int x25_device_event(struct notifier_block *this, unsigned long event,
190                             void *ptr)
191 {
192         struct net_device *dev = ptr;
193         struct x25_neigh *nb;
194
195         if (!net_eq(dev_net(dev), &init_net))
196                 return NOTIFY_DONE;
197
198         if (dev->type == ARPHRD_X25
199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
200          || dev->type == ARPHRD_ETHER
201 #endif
202          ) {
203                 switch (event) {
204                         case NETDEV_UP:
205                                 x25_link_device_up(dev);
206                                 break;
207                         case NETDEV_GOING_DOWN:
208                                 nb = x25_get_neigh(dev);
209                                 if (nb) {
210                                         x25_terminate_link(nb);
211                                         x25_neigh_put(nb);
212                                 }
213                                 break;
214                         case NETDEV_DOWN:
215                                 x25_kill_by_device(dev);
216                                 x25_route_device_down(dev);
217                                 x25_link_device_down(dev);
218                                 break;
219                 }
220         }
221
222         return NOTIFY_DONE;
223 }
224
225 /*
226  *      Add a socket to the bound sockets list.
227  */
228 static void x25_insert_socket(struct sock *sk)
229 {
230         write_lock_bh(&x25_list_lock);
231         sk_add_node(sk, &x25_list);
232         write_unlock_bh(&x25_list_lock);
233 }
234
235 /*
236  *      Find a socket that wants to accept the Call Request we just
237  *      received. Check the full list for an address/cud match.
238  *      If no cuds match return the next_best thing, an address match.
239  *      Note: if a listening socket has cud set it must only get calls
240  *      with matching cud.
241  */
242 static struct sock *x25_find_listener(struct x25_address *addr,
243                                         struct sk_buff *skb)
244 {
245         struct sock *s;
246         struct sock *next_best;
247         struct hlist_node *node;
248
249         read_lock_bh(&x25_list_lock);
250         next_best = NULL;
251
252         sk_for_each(s, node, &x25_list)
253                 if ((!strcmp(addr->x25_addr,
254                         x25_sk(s)->source_addr.x25_addr) ||
255                                 !strcmp(addr->x25_addr,
256                                         null_x25_address.x25_addr)) &&
257                                         s->sk_state == TCP_LISTEN) {
258                         /*
259                          * Found a listening socket, now check the incoming
260                          * call user data vs this sockets call user data
261                          */
262                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
263                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
264                                         skb->data,
265                                         x25_sk(s)->cudmatchlength)) == 0) {
266                                         sock_hold(s);
267                                         goto found;
268                                  }
269                         } else
270                                 next_best = s;
271                 }
272         if (next_best) {
273                 s = next_best;
274                 sock_hold(s);
275                 goto found;
276         }
277         s = NULL;
278 found:
279         read_unlock_bh(&x25_list_lock);
280         return s;
281 }
282
283 /*
284  *      Find a connected X.25 socket given my LCI and neighbour.
285  */
286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
287 {
288         struct sock *s;
289         struct hlist_node *node;
290
291         sk_for_each(s, node, &x25_list)
292                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
293                         sock_hold(s);
294                         goto found;
295                 }
296         s = NULL;
297 found:
298         return s;
299 }
300
301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
302 {
303         struct sock *s;
304
305         read_lock_bh(&x25_list_lock);
306         s = __x25_find_socket(lci, nb);
307         read_unlock_bh(&x25_list_lock);
308         return s;
309 }
310
311 /*
312  *      Find a unique LCI for a given device.
313  */
314 static unsigned int x25_new_lci(struct x25_neigh *nb)
315 {
316         unsigned int lci = 1;
317         struct sock *sk;
318
319         read_lock_bh(&x25_list_lock);
320
321         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
322                 sock_put(sk);
323                 if (++lci == 4096) {
324                         lci = 0;
325                         break;
326                 }
327         }
328
329         read_unlock_bh(&x25_list_lock);
330         return lci;
331 }
332
333 /*
334  *      Deferred destroy.
335  */
336 static void __x25_destroy_socket(struct sock *);
337
338 /*
339  *      handler for deferred kills.
340  */
341 static void x25_destroy_timer(unsigned long data)
342 {
343         x25_destroy_socket_from_timer((struct sock *)data);
344 }
345
346 /*
347  *      This is called from user mode and the timers. Thus it protects itself
348  *      against interrupt users but doesn't worry about being called during
349  *      work. Once it is removed from the queue no interrupt or bottom half
350  *      will touch it and we are (fairly 8-) ) safe.
351  *      Not static as it's used by the timer
352  */
353 static void __x25_destroy_socket(struct sock *sk)
354 {
355         struct sk_buff *skb;
356
357         x25_stop_heartbeat(sk);
358         x25_stop_timer(sk);
359
360         x25_remove_socket(sk);
361         x25_clear_queues(sk);           /* Flush the queues */
362
363         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
364                 if (skb->sk != sk) {            /* A pending connection */
365                         /*
366                          * Queue the unaccepted socket for death
367                          */
368                         sock_set_flag(skb->sk, SOCK_DEAD);
369                         x25_start_heartbeat(skb->sk);
370                         x25_sk(skb->sk)->state = X25_STATE_0;
371                 }
372
373                 kfree_skb(skb);
374         }
375
376         if (sk_has_allocations(sk)) {
377                 /* Defer: outstanding buffers */
378                 sk->sk_timer.expires  = jiffies + 10 * HZ;
379                 sk->sk_timer.function = x25_destroy_timer;
380                 sk->sk_timer.data = (unsigned long)sk;
381                 add_timer(&sk->sk_timer);
382         } else {
383                 /* drop last reference so sock_put will free */
384                 __sock_put(sk);
385         }
386 }
387
388 void x25_destroy_socket_from_timer(struct sock *sk)
389 {
390         sock_hold(sk);
391         bh_lock_sock(sk);
392         __x25_destroy_socket(sk);
393         bh_unlock_sock(sk);
394         sock_put(sk);
395 }
396
397 static void x25_destroy_socket(struct sock *sk)
398 {
399         sock_hold(sk);
400         lock_sock(sk);
401         __x25_destroy_socket(sk);
402         release_sock(sk);
403         sock_put(sk);
404 }
405
406 /*
407  *      Handling for system calls applied via the various interfaces to a
408  *      X.25 socket object.
409  */
410
411 static int x25_setsockopt(struct socket *sock, int level, int optname,
412                           char __user *optval, unsigned int optlen)
413 {
414         int opt;
415         struct sock *sk = sock->sk;
416         int rc = -ENOPROTOOPT;
417
418         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                       int kern)
506 {
507         struct sock *sk;
508         struct x25_sock *x25;
509         int rc = -ESOCKTNOSUPPORT;
510
511         if (net != &init_net)
512                 return -EAFNOSUPPORT;
513
514         if (sock->type != SOCK_SEQPACKET || protocol)
515                 goto out;
516
517         rc = -ENOMEM;
518         if ((sk = x25_alloc_socket(net)) == NULL)
519                 goto out;
520
521         x25 = x25_sk(sk);
522
523         sock_init_data(sock, sk);
524
525         x25_init_timers(sk);
526
527         sock->ops    = &x25_proto_ops;
528         sk->sk_protocol = protocol;
529         sk->sk_backlog_rcv = x25_backlog_rcv;
530
531         x25->t21   = sysctl_x25_call_request_timeout;
532         x25->t22   = sysctl_x25_reset_request_timeout;
533         x25->t23   = sysctl_x25_clear_request_timeout;
534         x25->t2    = sysctl_x25_ack_holdback_timeout;
535         x25->state = X25_STATE_0;
536         x25->cudmatchlength = 0;
537         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
538                                                         /* on call accept   */
539
540         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
541         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
542         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
543         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
544         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
545         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
546         x25->dte_facilities.calling_len = 0;
547         x25->dte_facilities.called_len = 0;
548         memset(x25->dte_facilities.called_ae, '\0',
549                         sizeof(x25->dte_facilities.called_ae));
550         memset(x25->dte_facilities.calling_ae, '\0',
551                         sizeof(x25->dte_facilities.calling_ae));
552
553         rc = 0;
554 out:
555         return rc;
556 }
557
558 static struct sock *x25_make_new(struct sock *osk)
559 {
560         struct sock *sk = NULL;
561         struct x25_sock *x25, *ox25;
562
563         if (osk->sk_type != SOCK_SEQPACKET)
564                 goto out;
565
566         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
567                 goto out;
568
569         x25 = x25_sk(sk);
570
571         sk->sk_type        = osk->sk_type;
572         sk->sk_priority    = osk->sk_priority;
573         sk->sk_protocol    = osk->sk_protocol;
574         sk->sk_rcvbuf      = osk->sk_rcvbuf;
575         sk->sk_sndbuf      = osk->sk_sndbuf;
576         sk->sk_state       = TCP_ESTABLISHED;
577         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
578         sock_copy_flags(sk, osk);
579
580         ox25 = x25_sk(osk);
581         x25->t21        = ox25->t21;
582         x25->t22        = ox25->t22;
583         x25->t23        = ox25->t23;
584         x25->t2         = ox25->t2;
585         x25->facilities = ox25->facilities;
586         x25->qbitincl   = ox25->qbitincl;
587         x25->dte_facilities = ox25->dte_facilities;
588         x25->cudmatchlength = ox25->cudmatchlength;
589         x25->accptapprv = ox25->accptapprv;
590
591         x25_init_timers(sk);
592 out:
593         return sk;
594 }
595
596 static int x25_release(struct socket *sock)
597 {
598         struct sock *sk = sock->sk;
599         struct x25_sock *x25;
600
601         if (!sk)
602                 goto out;
603
604         x25 = x25_sk(sk);
605
606         switch (x25->state) {
607
608                 case X25_STATE_0:
609                 case X25_STATE_2:
610                         x25_disconnect(sk, 0, 0, 0);
611                         x25_destroy_socket(sk);
612                         goto out;
613
614                 case X25_STATE_1:
615                 case X25_STATE_3:
616                 case X25_STATE_4:
617                         x25_clear_queues(sk);
618                         x25_write_internal(sk, X25_CLEAR_REQUEST);
619                         x25_start_t23timer(sk);
620                         x25->state = X25_STATE_2;
621                         sk->sk_state    = TCP_CLOSE;
622                         sk->sk_shutdown |= SEND_SHUTDOWN;
623                         sk->sk_state_change(sk);
624                         sock_set_flag(sk, SOCK_DEAD);
625                         sock_set_flag(sk, SOCK_DESTROY);
626                         break;
627         }
628
629         sock_orphan(sk);
630 out:
631         return 0;
632 }
633
634 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
635 {
636         struct sock *sk = sock->sk;
637         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
638
639         if (!sock_flag(sk, SOCK_ZAPPED) ||
640             addr_len != sizeof(struct sockaddr_x25) ||
641             addr->sx25_family != AF_X25)
642                 return -EINVAL;
643
644         x25_sk(sk)->source_addr = addr->sx25_addr;
645         x25_insert_socket(sk);
646         sock_reset_flag(sk, SOCK_ZAPPED);
647         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
648
649         return 0;
650 }
651
652 static int x25_wait_for_connection_establishment(struct sock *sk)
653 {
654         DECLARE_WAITQUEUE(wait, current);
655         int rc;
656
657         add_wait_queue_exclusive(sk->sk_sleep, &wait);
658         for (;;) {
659                 __set_current_state(TASK_INTERRUPTIBLE);
660                 rc = -ERESTARTSYS;
661                 if (signal_pending(current))
662                         break;
663                 rc = sock_error(sk);
664                 if (rc) {
665                         sk->sk_socket->state = SS_UNCONNECTED;
666                         break;
667                 }
668                 rc = 0;
669                 if (sk->sk_state != TCP_ESTABLISHED) {
670                         release_sock(sk);
671                         schedule();
672                         lock_sock(sk);
673                 } else
674                         break;
675         }
676         __set_current_state(TASK_RUNNING);
677         remove_wait_queue(sk->sk_sleep, &wait);
678         return rc;
679 }
680
681 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
682                        int addr_len, int flags)
683 {
684         struct sock *sk = sock->sk;
685         struct x25_sock *x25 = x25_sk(sk);
686         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
687         struct x25_route *rt;
688         int rc = 0;
689
690         lock_sock(sk);
691         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
692                 sock->state = SS_CONNECTED;
693                 goto out; /* Connect completed during a ERESTARTSYS event */
694         }
695
696         rc = -ECONNREFUSED;
697         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
698                 sock->state = SS_UNCONNECTED;
699                 goto out;
700         }
701
702         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
703         if (sk->sk_state == TCP_ESTABLISHED)
704                 goto out;
705
706         sk->sk_state   = TCP_CLOSE;
707         sock->state = SS_UNCONNECTED;
708
709         rc = -EINVAL;
710         if (addr_len != sizeof(struct sockaddr_x25) ||
711             addr->sx25_family != AF_X25)
712                 goto out;
713
714         rc = -ENETUNREACH;
715         rt = x25_get_route(&addr->sx25_addr);
716         if (!rt)
717                 goto out;
718
719         x25->neighbour = x25_get_neigh(rt->dev);
720         if (!x25->neighbour)
721                 goto out_put_route;
722
723         x25_limit_facilities(&x25->facilities, x25->neighbour);
724
725         x25->lci = x25_new_lci(x25->neighbour);
726         if (!x25->lci)
727                 goto out_put_neigh;
728
729         rc = -EINVAL;
730         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
731                 goto out_put_neigh;
732
733         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
734                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
735
736         x25->dest_addr = addr->sx25_addr;
737
738         /* Move to connecting socket, start sending Connect Requests */
739         sock->state   = SS_CONNECTING;
740         sk->sk_state  = TCP_SYN_SENT;
741
742         x25->state = X25_STATE_1;
743
744         x25_write_internal(sk, X25_CALL_REQUEST);
745
746         x25_start_heartbeat(sk);
747         x25_start_t21timer(sk);
748
749         /* Now the loop */
750         rc = -EINPROGRESS;
751         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
752                 goto out_put_neigh;
753
754         rc = x25_wait_for_connection_establishment(sk);
755         if (rc)
756                 goto out_put_neigh;
757
758         sock->state = SS_CONNECTED;
759         rc = 0;
760 out_put_neigh:
761         if (rc)
762                 x25_neigh_put(x25->neighbour);
763 out_put_route:
764         x25_route_put(rt);
765 out:
766         release_sock(sk);
767         return rc;
768 }
769
770 static int x25_wait_for_data(struct sock *sk, long timeout)
771 {
772         DECLARE_WAITQUEUE(wait, current);
773         int rc = 0;
774
775         add_wait_queue_exclusive(sk->sk_sleep, &wait);
776         for (;;) {
777                 __set_current_state(TASK_INTERRUPTIBLE);
778                 if (sk->sk_shutdown & RCV_SHUTDOWN)
779                         break;
780                 rc = -ERESTARTSYS;
781                 if (signal_pending(current))
782                         break;
783                 rc = -EAGAIN;
784                 if (!timeout)
785                         break;
786                 rc = 0;
787                 if (skb_queue_empty(&sk->sk_receive_queue)) {
788                         release_sock(sk);
789                         timeout = schedule_timeout(timeout);
790                         lock_sock(sk);
791                 } else
792                         break;
793         }
794         __set_current_state(TASK_RUNNING);
795         remove_wait_queue(sk->sk_sleep, &wait);
796         return rc;
797 }
798
799 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
800 {
801         struct sock *sk = sock->sk;
802         struct sock *newsk;
803         struct sk_buff *skb;
804         int rc = -EINVAL;
805
806         if (!sk || sk->sk_state != TCP_LISTEN)
807                 goto out;
808
809         rc = -EOPNOTSUPP;
810         if (sk->sk_type != SOCK_SEQPACKET)
811                 goto out;
812
813         lock_sock(sk);
814         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
815         if (rc)
816                 goto out2;
817         skb = skb_dequeue(&sk->sk_receive_queue);
818         rc = -EINVAL;
819         if (!skb->sk)
820                 goto out2;
821         newsk            = skb->sk;
822         sock_graft(newsk, newsock);
823
824         /* Now attach up the new socket */
825         skb->sk = NULL;
826         kfree_skb(skb);
827         sk->sk_ack_backlog--;
828         newsock->state = SS_CONNECTED;
829         rc = 0;
830 out2:
831         release_sock(sk);
832 out:
833         return rc;
834 }
835
836 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
837                        int *uaddr_len, int peer)
838 {
839         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
840         struct sock *sk = sock->sk;
841         struct x25_sock *x25 = x25_sk(sk);
842
843         if (peer) {
844                 if (sk->sk_state != TCP_ESTABLISHED)
845                         return -ENOTCONN;
846                 sx25->sx25_addr = x25->dest_addr;
847         } else
848                 sx25->sx25_addr = x25->source_addr;
849
850         sx25->sx25_family = AF_X25;
851         *uaddr_len = sizeof(*sx25);
852
853         return 0;
854 }
855
856 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
857                         unsigned int lci)
858 {
859         struct sock *sk;
860         struct sock *make;
861         struct x25_sock *makex25;
862         struct x25_address source_addr, dest_addr;
863         struct x25_facilities facilities;
864         struct x25_dte_facilities dte_facilities;
865         int len, addr_len, rc;
866
867         /*
868          *      Remove the LCI and frame type.
869          */
870         skb_pull(skb, X25_STD_MIN_LEN);
871
872         /*
873          *      Extract the X.25 addresses and convert them to ASCII strings,
874          *      and remove them.
875          */
876         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
877         skb_pull(skb, addr_len);
878
879         /*
880          *      Get the length of the facilities, skip past them for the moment
881          *      get the call user data because this is needed to determine
882          *      the correct listener
883          */
884         len = skb->data[0] + 1;
885         skb_pull(skb,len);
886
887         /*
888          *      Find a listener for the particular address/cud pair.
889          */
890         sk = x25_find_listener(&source_addr,skb);
891         skb_push(skb,len);
892
893         if (sk != NULL && sk_acceptq_is_full(sk)) {
894                 goto out_sock_put;
895         }
896
897         /*
898          *      We dont have any listeners for this incoming call.
899          *      Try forwarding it.
900          */
901         if (sk == NULL) {
902                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
903                 if (sysctl_x25_forward &&
904                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
905                 {
906                         /* Call was forwarded, dont process it any more */
907                         kfree_skb(skb);
908                         rc = 1;
909                         goto out;
910                 } else {
911                         /* No listeners, can't forward, clear the call */
912                         goto out_clear_request;
913                 }
914         }
915
916         /*
917          *      Try to reach a compromise on the requested facilities.
918          */
919         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
920         if (len == -1)
921                 goto out_sock_put;
922
923         /*
924          * current neighbour/link might impose additional limits
925          * on certain facilties
926          */
927
928         x25_limit_facilities(&facilities, nb);
929
930         /*
931          *      Try to create a new socket.
932          */
933         make = x25_make_new(sk);
934         if (!make)
935                 goto out_sock_put;
936
937         /*
938          *      Remove the facilities
939          */
940         skb_pull(skb, len);
941
942         skb->sk     = make;
943         make->sk_state = TCP_ESTABLISHED;
944
945         makex25 = x25_sk(make);
946         makex25->lci           = lci;
947         makex25->dest_addr     = dest_addr;
948         makex25->source_addr   = source_addr;
949         makex25->neighbour     = nb;
950         makex25->facilities    = facilities;
951         makex25->dte_facilities= dte_facilities;
952         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
953         /* ensure no reverse facil on accept */
954         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
955         /* ensure no calling address extension on accept */
956         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
957         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
958
959         /* Normally all calls are accepted immediatly */
960         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
961                 x25_write_internal(make, X25_CALL_ACCEPTED);
962                 makex25->state = X25_STATE_3;
963         }
964
965         /*
966          *      Incoming Call User Data.
967          */
968         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
969         makex25->calluserdata.cudlength = skb->len;
970
971         sk->sk_ack_backlog++;
972
973         x25_insert_socket(make);
974
975         skb_queue_head(&sk->sk_receive_queue, skb);
976
977         x25_start_heartbeat(make);
978
979         if (!sock_flag(sk, SOCK_DEAD))
980                 sk->sk_data_ready(sk, skb->len);
981         rc = 1;
982         sock_put(sk);
983 out:
984         return rc;
985 out_sock_put:
986         sock_put(sk);
987 out_clear_request:
988         rc = 0;
989         x25_transmit_clear_request(nb, lci, 0x01);
990         goto out;
991 }
992
993 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
994                        struct msghdr *msg, size_t len)
995 {
996         struct sock *sk = sock->sk;
997         struct x25_sock *x25 = x25_sk(sk);
998         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
999         struct sockaddr_x25 sx25;
1000         struct sk_buff *skb;
1001         unsigned char *asmptr;
1002         int noblock = msg->msg_flags & MSG_DONTWAIT;
1003         size_t size;
1004         int qbit = 0, rc = -EINVAL;
1005
1006         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1007                 goto out;
1008
1009         /* we currently don't support segmented records at the user interface */
1010         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1011                 goto out;
1012
1013         rc = -EADDRNOTAVAIL;
1014         if (sock_flag(sk, SOCK_ZAPPED))
1015                 goto out;
1016
1017         rc = -EPIPE;
1018         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1019                 send_sig(SIGPIPE, current, 0);
1020                 goto out;
1021         }
1022
1023         rc = -ENETUNREACH;
1024         if (!x25->neighbour)
1025                 goto out;
1026
1027         if (usx25) {
1028                 rc = -EINVAL;
1029                 if (msg->msg_namelen < sizeof(sx25))
1030                         goto out;
1031                 memcpy(&sx25, usx25, sizeof(sx25));
1032                 rc = -EISCONN;
1033                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1034                         goto out;
1035                 rc = -EINVAL;
1036                 if (sx25.sx25_family != AF_X25)
1037                         goto out;
1038         } else {
1039                 /*
1040                  *      FIXME 1003.1g - if the socket is like this because
1041                  *      it has become closed (not started closed) we ought
1042                  *      to SIGPIPE, EPIPE;
1043                  */
1044                 rc = -ENOTCONN;
1045                 if (sk->sk_state != TCP_ESTABLISHED)
1046                         goto out;
1047
1048                 sx25.sx25_family = AF_X25;
1049                 sx25.sx25_addr   = x25->dest_addr;
1050         }
1051
1052         /* Sanity check the packet size */
1053         if (len > 65535) {
1054                 rc = -EMSGSIZE;
1055                 goto out;
1056         }
1057
1058         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1059
1060         /* Build a packet */
1061         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1062
1063         if ((msg->msg_flags & MSG_OOB) && len > 32)
1064                 len = 32;
1065
1066         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1067
1068         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1069         if (!skb)
1070                 goto out;
1071         X25_SKB_CB(skb)->flags = msg->msg_flags;
1072
1073         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1074
1075         /*
1076          *      Put the data on the end
1077          */
1078         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1079
1080         skb_reset_transport_header(skb);
1081         skb_put(skb, len);
1082
1083         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1084         if (rc)
1085                 goto out_kfree_skb;
1086
1087         /*
1088          *      If the Q BIT Include socket option is in force, the first
1089          *      byte of the user data is the logical value of the Q Bit.
1090          */
1091         if (x25->qbitincl) {
1092                 qbit = skb->data[0];
1093                 skb_pull(skb, 1);
1094         }
1095
1096         /*
1097          *      Push down the X.25 header
1098          */
1099         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1100
1101         if (msg->msg_flags & MSG_OOB) {
1102                 if (x25->neighbour->extended) {
1103                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1104                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1105                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1106                         *asmptr++ = X25_INTERRUPT;
1107                 } else {
1108                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1109                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1110                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1111                         *asmptr++ = X25_INTERRUPT;
1112                 }
1113         } else {
1114                 if (x25->neighbour->extended) {
1115                         /* Build an Extended X.25 header */
1116                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1117                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1118                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1119                         *asmptr++ = X25_DATA;
1120                         *asmptr++ = X25_DATA;
1121                 } else {
1122                         /* Build an Standard X.25 header */
1123                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1124                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1125                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1126                         *asmptr++ = X25_DATA;
1127                 }
1128
1129                 if (qbit)
1130                         skb->data[0] |= X25_Q_BIT;
1131         }
1132
1133         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1134         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1135
1136         rc = -ENOTCONN;
1137         if (sk->sk_state != TCP_ESTABLISHED)
1138                 goto out_kfree_skb;
1139
1140         if (msg->msg_flags & MSG_OOB)
1141                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1142         else {
1143                 rc = x25_output(sk, skb);
1144                 len = rc;
1145                 if (rc < 0)
1146                         kfree_skb(skb);
1147                 else if (x25->qbitincl)
1148                         len++;
1149         }
1150
1151         /*
1152          * lock_sock() is currently only used to serialize this x25_kick()
1153          * against input-driven x25_kick() calls. It currently only blocks
1154          * incoming packets for this socket and does not protect against
1155          * any other socket state changes and is not called from anywhere
1156          * else. As x25_kick() cannot block and as long as all socket
1157          * operations are BKL-wrapped, we don't need take to care about
1158          * purging the backlog queue in x25_release().
1159          *
1160          * Using lock_sock() to protect all socket operations entirely
1161          * (and making the whole x25 stack SMP aware) unfortunately would
1162          * require major changes to {send,recv}msg and skb allocation methods.
1163          * -> 2.5 ;)
1164          */
1165         lock_sock(sk);
1166         x25_kick(sk);
1167         release_sock(sk);
1168         rc = len;
1169 out:
1170         return rc;
1171 out_kfree_skb:
1172         kfree_skb(skb);
1173         goto out;
1174 }
1175
1176
1177 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1178                        struct msghdr *msg, size_t size,
1179                        int flags)
1180 {
1181         struct sock *sk = sock->sk;
1182         struct x25_sock *x25 = x25_sk(sk);
1183         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1184         size_t copied;
1185         int qbit;
1186         struct sk_buff *skb;
1187         unsigned char *asmptr;
1188         int rc = -ENOTCONN;
1189
1190         /*
1191          * This works for seqpacket too. The receiver has ordered the queue for
1192          * us! We do one quick check first though
1193          */
1194         if (sk->sk_state != TCP_ESTABLISHED)
1195                 goto out;
1196
1197         if (flags & MSG_OOB) {
1198                 rc = -EINVAL;
1199                 if (sock_flag(sk, SOCK_URGINLINE) ||
1200                     !skb_peek(&x25->interrupt_in_queue))
1201                         goto out;
1202
1203                 skb = skb_dequeue(&x25->interrupt_in_queue);
1204
1205                 skb_pull(skb, X25_STD_MIN_LEN);
1206
1207                 /*
1208                  *      No Q bit information on Interrupt data.
1209                  */
1210                 if (x25->qbitincl) {
1211                         asmptr  = skb_push(skb, 1);
1212                         *asmptr = 0x00;
1213                 }
1214
1215                 msg->msg_flags |= MSG_OOB;
1216         } else {
1217                 /* Now we can treat all alike */
1218                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1219                                         flags & MSG_DONTWAIT, &rc);
1220                 if (!skb)
1221                         goto out;
1222
1223                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1224
1225                 skb_pull(skb, x25->neighbour->extended ?
1226                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1227
1228                 if (x25->qbitincl) {
1229                         asmptr  = skb_push(skb, 1);
1230                         *asmptr = qbit;
1231                 }
1232         }
1233
1234         skb_reset_transport_header(skb);
1235         copied = skb->len;
1236
1237         if (copied > size) {
1238                 copied = size;
1239                 msg->msg_flags |= MSG_TRUNC;
1240         }
1241
1242         /* Currently, each datagram always contains a complete record */
1243         msg->msg_flags |= MSG_EOR;
1244
1245         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1246         if (rc)
1247                 goto out_free_dgram;
1248
1249         if (sx25) {
1250                 sx25->sx25_family = AF_X25;
1251                 sx25->sx25_addr   = x25->dest_addr;
1252         }
1253
1254         msg->msg_namelen = sizeof(struct sockaddr_x25);
1255
1256         lock_sock(sk);
1257         x25_check_rbuf(sk);
1258         release_sock(sk);
1259         rc = copied;
1260 out_free_dgram:
1261         skb_free_datagram(sk, skb);
1262 out:
1263         return rc;
1264 }
1265
1266
1267 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1268 {
1269         struct sock *sk = sock->sk;
1270         struct x25_sock *x25 = x25_sk(sk);
1271         void __user *argp = (void __user *)arg;
1272         int rc;
1273
1274         switch (cmd) {
1275                 case TIOCOUTQ: {
1276                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1277
1278                         if (amount < 0)
1279                                 amount = 0;
1280                         rc = put_user(amount, (unsigned int __user *)argp);
1281                         break;
1282                 }
1283
1284                 case TIOCINQ: {
1285                         struct sk_buff *skb;
1286                         int amount = 0;
1287                         /*
1288                          * These two are safe on a single CPU system as
1289                          * only user tasks fiddle here
1290                          */
1291                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1292                                 amount = skb->len;
1293                         rc = put_user(amount, (unsigned int __user *)argp);
1294                         break;
1295                 }
1296
1297                 case SIOCGSTAMP:
1298                         rc = -EINVAL;
1299                         if (sk)
1300                                 rc = sock_get_timestamp(sk,
1301                                                 (struct timeval __user *)argp);
1302                         break;
1303                 case SIOCGSTAMPNS:
1304                         rc = -EINVAL;
1305                         if (sk)
1306                                 rc = sock_get_timestampns(sk,
1307                                                 (struct timespec __user *)argp);
1308                         break;
1309                 case SIOCGIFADDR:
1310                 case SIOCSIFADDR:
1311                 case SIOCGIFDSTADDR:
1312                 case SIOCSIFDSTADDR:
1313                 case SIOCGIFBRDADDR:
1314                 case SIOCSIFBRDADDR:
1315                 case SIOCGIFNETMASK:
1316                 case SIOCSIFNETMASK:
1317                 case SIOCGIFMETRIC:
1318                 case SIOCSIFMETRIC:
1319                         rc = -EINVAL;
1320                         break;
1321                 case SIOCADDRT:
1322                 case SIOCDELRT:
1323                         rc = -EPERM;
1324                         if (!capable(CAP_NET_ADMIN))
1325                                 break;
1326                         rc = x25_route_ioctl(cmd, argp);
1327                         break;
1328                 case SIOCX25GSUBSCRIP:
1329                         rc = x25_subscr_ioctl(cmd, argp);
1330                         break;
1331                 case SIOCX25SSUBSCRIP:
1332                         rc = -EPERM;
1333                         if (!capable(CAP_NET_ADMIN))
1334                                 break;
1335                         rc = x25_subscr_ioctl(cmd, argp);
1336                         break;
1337                 case SIOCX25GFACILITIES: {
1338                         struct x25_facilities fac = x25->facilities;
1339                         rc = copy_to_user(argp, &fac,
1340                                           sizeof(fac)) ? -EFAULT : 0;
1341                         break;
1342                 }
1343
1344                 case SIOCX25SFACILITIES: {
1345                         struct x25_facilities facilities;
1346                         rc = -EFAULT;
1347                         if (copy_from_user(&facilities, argp,
1348                                            sizeof(facilities)))
1349                                 break;
1350                         rc = -EINVAL;
1351                         if (sk->sk_state != TCP_LISTEN &&
1352                             sk->sk_state != TCP_CLOSE)
1353                                 break;
1354                         if (facilities.pacsize_in < X25_PS16 ||
1355                             facilities.pacsize_in > X25_PS4096)
1356                                 break;
1357                         if (facilities.pacsize_out < X25_PS16 ||
1358                             facilities.pacsize_out > X25_PS4096)
1359                                 break;
1360                         if (facilities.winsize_in < 1 ||
1361                             facilities.winsize_in > 127)
1362                                 break;
1363                         if (facilities.throughput < 0x03 ||
1364                             facilities.throughput > 0xDD)
1365                                 break;
1366                         if (facilities.reverse &&
1367                                 (facilities.reverse & 0x81) != 0x81)
1368                                 break;
1369                         x25->facilities = facilities;
1370                         rc = 0;
1371                         break;
1372                 }
1373
1374                 case SIOCX25GDTEFACILITIES: {
1375                         rc = copy_to_user(argp, &x25->dte_facilities,
1376                                                 sizeof(x25->dte_facilities));
1377                         if (rc)
1378                                 rc = -EFAULT;
1379                         break;
1380                 }
1381
1382                 case SIOCX25SDTEFACILITIES: {
1383                         struct x25_dte_facilities dtefacs;
1384                         rc = -EFAULT;
1385                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1386                                 break;
1387                         rc = -EINVAL;
1388                         if (sk->sk_state != TCP_LISTEN &&
1389                                         sk->sk_state != TCP_CLOSE)
1390                                 break;
1391                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1392                                 break;
1393                         if (dtefacs.calling_ae == NULL)
1394                                 break;
1395                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1396                                 break;
1397                         if (dtefacs.called_ae == NULL)
1398                                 break;
1399                         x25->dte_facilities = dtefacs;
1400                         rc = 0;
1401                         break;
1402                 }
1403
1404                 case SIOCX25GCALLUSERDATA: {
1405                         struct x25_calluserdata cud = x25->calluserdata;
1406                         rc = copy_to_user(argp, &cud,
1407                                           sizeof(cud)) ? -EFAULT : 0;
1408                         break;
1409                 }
1410
1411                 case SIOCX25SCALLUSERDATA: {
1412                         struct x25_calluserdata calluserdata;
1413
1414                         rc = -EFAULT;
1415                         if (copy_from_user(&calluserdata, argp,
1416                                            sizeof(calluserdata)))
1417                                 break;
1418                         rc = -EINVAL;
1419                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1420                                 break;
1421                         x25->calluserdata = calluserdata;
1422                         rc = 0;
1423                         break;
1424                 }
1425
1426                 case SIOCX25GCAUSEDIAG: {
1427                         struct x25_causediag causediag;
1428                         causediag = x25->causediag;
1429                         rc = copy_to_user(argp, &causediag,
1430                                           sizeof(causediag)) ? -EFAULT : 0;
1431                         break;
1432                 }
1433
1434                 case SIOCX25SCUDMATCHLEN: {
1435                         struct x25_subaddr sub_addr;
1436                         rc = -EINVAL;
1437                         if(sk->sk_state != TCP_CLOSE)
1438                                 break;
1439                         rc = -EFAULT;
1440                         if (copy_from_user(&sub_addr, argp,
1441                                         sizeof(sub_addr)))
1442                                 break;
1443                         rc = -EINVAL;
1444                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1445                                 break;
1446                         x25->cudmatchlength = sub_addr.cudmatchlength;
1447                         rc = 0;
1448                         break;
1449                 }
1450
1451                 case SIOCX25CALLACCPTAPPRV: {
1452                         rc = -EINVAL;
1453                         if (sk->sk_state != TCP_CLOSE)
1454                                 break;
1455                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1456                         rc = 0;
1457                         break;
1458                 }
1459
1460                 case SIOCX25SENDCALLACCPT:  {
1461                         rc = -EINVAL;
1462                         if (sk->sk_state != TCP_ESTABLISHED)
1463                                 break;
1464                         if (x25->accptapprv)    /* must call accptapprv above */
1465                                 break;
1466                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1467                         x25->state = X25_STATE_3;
1468                         rc = 0;
1469                         break;
1470                 }
1471
1472                 default:
1473                         rc = -ENOIOCTLCMD;
1474                         break;
1475         }
1476
1477         return rc;
1478 }
1479
1480 static const struct net_proto_family x25_family_ops = {
1481         .family =       AF_X25,
1482         .create =       x25_create,
1483         .owner  =       THIS_MODULE,
1484 };
1485
1486 #ifdef CONFIG_COMPAT
1487 static int compat_x25_subscr_ioctl(unsigned int cmd,
1488                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1489 {
1490         struct compat_x25_subscrip_struct x25_subscr;
1491         struct x25_neigh *nb;
1492         struct net_device *dev;
1493         int rc = -EINVAL;
1494
1495         rc = -EFAULT;
1496         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1497                 goto out;
1498
1499         rc = -EINVAL;
1500         dev = x25_dev_get(x25_subscr.device);
1501         if (dev == NULL)
1502                 goto out;
1503
1504         nb = x25_get_neigh(dev);
1505         if (nb == NULL)
1506                 goto out_dev_put;
1507
1508         dev_put(dev);
1509
1510         if (cmd == SIOCX25GSUBSCRIP) {
1511                 x25_subscr.extended = nb->extended;
1512                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1513                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1514                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1515         } else {
1516                 rc = -EINVAL;
1517                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1518                         rc = 0;
1519                         nb->extended = x25_subscr.extended;
1520                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1521                 }
1522         }
1523         x25_neigh_put(nb);
1524 out:
1525         return rc;
1526 out_dev_put:
1527         dev_put(dev);
1528         goto out;
1529 }
1530
1531 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1532                                 unsigned long arg)
1533 {
1534         void __user *argp = compat_ptr(arg);
1535         struct sock *sk = sock->sk;
1536
1537         int rc = -ENOIOCTLCMD;
1538
1539         switch(cmd) {
1540         case TIOCOUTQ:
1541         case TIOCINQ:
1542                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1543                 break;
1544         case SIOCGSTAMP:
1545                 rc = -EINVAL;
1546                 if (sk)
1547                         rc = compat_sock_get_timestamp(sk,
1548                                         (struct timeval __user*)argp);
1549                 break;
1550         case SIOCGSTAMPNS:
1551                 rc = -EINVAL;
1552                 if (sk)
1553                         rc = compat_sock_get_timestampns(sk,
1554                                         (struct timespec __user*)argp);
1555                 break;
1556         case SIOCGIFADDR:
1557         case SIOCSIFADDR:
1558         case SIOCGIFDSTADDR:
1559         case SIOCSIFDSTADDR:
1560         case SIOCGIFBRDADDR:
1561         case SIOCSIFBRDADDR:
1562         case SIOCGIFNETMASK:
1563         case SIOCSIFNETMASK:
1564         case SIOCGIFMETRIC:
1565         case SIOCSIFMETRIC:
1566                 rc = -EINVAL;
1567                 break;
1568         case SIOCADDRT:
1569         case SIOCDELRT:
1570                 rc = -EPERM;
1571                 if (!capable(CAP_NET_ADMIN))
1572                         break;
1573                 rc = x25_route_ioctl(cmd, argp);
1574                 break;
1575         case SIOCX25GSUBSCRIP:
1576                 rc = compat_x25_subscr_ioctl(cmd, argp);
1577                 break;
1578         case SIOCX25SSUBSCRIP:
1579                 rc = -EPERM;
1580                 if (!capable(CAP_NET_ADMIN))
1581                         break;
1582                 rc = compat_x25_subscr_ioctl(cmd, argp);
1583                 break;
1584         case SIOCX25GFACILITIES:
1585         case SIOCX25SFACILITIES:
1586         case SIOCX25GDTEFACILITIES:
1587         case SIOCX25SDTEFACILITIES:
1588         case SIOCX25GCALLUSERDATA:
1589         case SIOCX25SCALLUSERDATA:
1590         case SIOCX25GCAUSEDIAG:
1591         case SIOCX25SCUDMATCHLEN:
1592         case SIOCX25CALLACCPTAPPRV:
1593         case SIOCX25SENDCALLACCPT:
1594                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1595                 break;
1596         default:
1597                 rc = -ENOIOCTLCMD;
1598                 break;
1599         }
1600         return rc;
1601 }
1602 #endif
1603
1604 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1605         .family =       AF_X25,
1606         .owner =        THIS_MODULE,
1607         .release =      x25_release,
1608         .bind =         x25_bind,
1609         .connect =      x25_connect,
1610         .socketpair =   sock_no_socketpair,
1611         .accept =       x25_accept,
1612         .getname =      x25_getname,
1613         .poll =         datagram_poll,
1614         .ioctl =        x25_ioctl,
1615 #ifdef CONFIG_COMPAT
1616         .compat_ioctl = compat_x25_ioctl,
1617 #endif
1618         .listen =       x25_listen,
1619         .shutdown =     sock_no_shutdown,
1620         .setsockopt =   x25_setsockopt,
1621         .getsockopt =   x25_getsockopt,
1622         .sendmsg =      x25_sendmsg,
1623         .recvmsg =      x25_recvmsg,
1624         .mmap =         sock_no_mmap,
1625         .sendpage =     sock_no_sendpage,
1626 };
1627
1628 SOCKOPS_WRAP(x25_proto, AF_X25);
1629
1630 static struct packet_type x25_packet_type __read_mostly = {
1631         .type = cpu_to_be16(ETH_P_X25),
1632         .func = x25_lapb_receive_frame,
1633 };
1634
1635 static struct notifier_block x25_dev_notifier = {
1636         .notifier_call = x25_device_event,
1637 };
1638
1639 void x25_kill_by_neigh(struct x25_neigh *nb)
1640 {
1641         struct sock *s;
1642         struct hlist_node *node;
1643
1644         write_lock_bh(&x25_list_lock);
1645
1646         sk_for_each(s, node, &x25_list)
1647                 if (x25_sk(s)->neighbour == nb)
1648                         x25_disconnect(s, ENETUNREACH, 0, 0);
1649
1650         write_unlock_bh(&x25_list_lock);
1651
1652         /* Remove any related forwards */
1653         x25_clear_forward_by_dev(nb->dev);
1654 }
1655
1656 static int __init x25_init(void)
1657 {
1658         int rc = proto_register(&x25_proto, 0);
1659
1660         if (rc != 0)
1661                 goto out;
1662
1663         sock_register(&x25_family_ops);
1664
1665         dev_add_pack(&x25_packet_type);
1666
1667         register_netdevice_notifier(&x25_dev_notifier);
1668
1669         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1670
1671 #ifdef CONFIG_SYSCTL
1672         x25_register_sysctl();
1673 #endif
1674         x25_proc_init();
1675 out:
1676         return rc;
1677 }
1678 module_init(x25_init);
1679
1680 static void __exit x25_exit(void)
1681 {
1682         x25_proc_exit();
1683         x25_link_free();
1684         x25_route_free();
1685
1686 #ifdef CONFIG_SYSCTL
1687         x25_unregister_sysctl();
1688 #endif
1689
1690         unregister_netdevice_notifier(&x25_dev_notifier);
1691
1692         dev_remove_pack(&x25_packet_type);
1693
1694         sock_unregister(AF_X25);
1695         proto_unregister(&x25_proto);
1696 }
1697 module_exit(x25_exit);
1698
1699 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1700 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1701 MODULE_LICENSE("GPL");
1702 MODULE_ALIAS_NETPROTO(PF_X25);