04321eec65e15ecabf146c461ecff55a1f5e470e
[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 <linux/slab.h>
51 #include <net/sock.h>
52 #include <net/tcp_states.h>
53 #include <asm/uaccess.h>
54 #include <linux/fcntl.h>
55 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
56 #include <linux/notifier.h>
57 #include <linux/init.h>
58 #include <linux/compat.h>
59 #include <linux/ctype.h>
60
61 #include <net/x25.h>
62 #include <net/compat.h>
63
64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
65 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
66 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
67 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
68 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
69 int sysctl_x25_forward                 = 0;
70
71 HLIST_HEAD(x25_list);
72 DEFINE_RWLOCK(x25_list_lock);
73
74 static const struct proto_ops x25_proto_ops;
75
76 static struct x25_address null_x25_address = {"               "};
77
78 #ifdef CONFIG_COMPAT
79 struct compat_x25_subscrip_struct {
80         char device[200-sizeof(compat_ulong_t)];
81         compat_ulong_t global_facil_mask;
82         compat_uint_t extended;
83 };
84 #endif
85
86
87 int x25_parse_address_block(struct sk_buff *skb,
88                 struct x25_address *called_addr,
89                 struct x25_address *calling_addr)
90 {
91         unsigned char len;
92         int needed;
93         int rc;
94
95         if (skb->len < 1) {
96                 /* packet has no address block */
97                 rc = 0;
98                 goto empty;
99         }
100
101         len = *skb->data;
102         needed = 1 + (len >> 4) + (len & 0x0f);
103
104         if (skb->len < needed) {
105                 /* packet is too short to hold the addresses it claims
106                    to hold */
107                 rc = -1;
108                 goto empty;
109         }
110
111         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
112
113 empty:
114         *called_addr->x25_addr = 0;
115         *calling_addr->x25_addr = 0;
116
117         return rc;
118 }
119
120
121 int x25_addr_ntoa(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         unsigned int i;
127
128         called_len  = (*p >> 0) & 0x0F;
129         calling_len = (*p >> 4) & 0x0F;
130
131         called  = called_addr->x25_addr;
132         calling = calling_addr->x25_addr;
133         p++;
134
135         for (i = 0; i < (called_len + calling_len); i++) {
136                 if (i < called_len) {
137                         if (i % 2 != 0) {
138                                 *called++ = ((*p >> 0) & 0x0F) + '0';
139                                 p++;
140                         } else {
141                                 *called++ = ((*p >> 4) & 0x0F) + '0';
142                         }
143                 } else {
144                         if (i % 2 != 0) {
145                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
146                                 p++;
147                         } else {
148                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
149                         }
150                 }
151         }
152
153         *called = *calling = '\0';
154
155         return 1 + (called_len + calling_len + 1) / 2;
156 }
157
158 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
159                   struct x25_address *calling_addr)
160 {
161         unsigned int called_len, calling_len;
162         char *called, *calling;
163         int i;
164
165         called  = called_addr->x25_addr;
166         calling = calling_addr->x25_addr;
167
168         called_len  = strlen(called);
169         calling_len = strlen(calling);
170
171         *p++ = (calling_len << 4) | (called_len << 0);
172
173         for (i = 0; i < (called_len + calling_len); i++) {
174                 if (i < called_len) {
175                         if (i % 2 != 0) {
176                                 *p |= (*called++ - '0') << 0;
177                                 p++;
178                         } else {
179                                 *p = 0x00;
180                                 *p |= (*called++ - '0') << 4;
181                         }
182                 } else {
183                         if (i % 2 != 0) {
184                                 *p |= (*calling++ - '0') << 0;
185                                 p++;
186                         } else {
187                                 *p = 0x00;
188                                 *p |= (*calling++ - '0') << 4;
189                         }
190                 }
191         }
192
193         return 1 + (called_len + calling_len + 1) / 2;
194 }
195
196 /*
197  *      Socket removal during an interrupt is now safe.
198  */
199 static void x25_remove_socket(struct sock *sk)
200 {
201         write_lock_bh(&x25_list_lock);
202         sk_del_node_init(sk);
203         write_unlock_bh(&x25_list_lock);
204 }
205
206 /*
207  *      Kill all bound sockets on a dropped device.
208  */
209 static void x25_kill_by_device(struct net_device *dev)
210 {
211         struct sock *s;
212         struct hlist_node *node;
213
214         write_lock_bh(&x25_list_lock);
215
216         sk_for_each(s, node, &x25_list)
217                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218                         x25_disconnect(s, ENETUNREACH, 0, 0);
219
220         write_unlock_bh(&x25_list_lock);
221 }
222
223 /*
224  *      Handle device status changes.
225  */
226 static int x25_device_event(struct notifier_block *this, unsigned long event,
227                             void *ptr)
228 {
229         struct net_device *dev = ptr;
230         struct x25_neigh *nb;
231
232         if (!net_eq(dev_net(dev), &init_net))
233                 return NOTIFY_DONE;
234
235         if (dev->type == ARPHRD_X25
236 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
237          || dev->type == ARPHRD_ETHER
238 #endif
239          ) {
240                 switch (event) {
241                         case NETDEV_UP:
242                                 x25_link_device_up(dev);
243                                 break;
244                         case NETDEV_GOING_DOWN:
245                                 nb = x25_get_neigh(dev);
246                                 if (nb) {
247                                         x25_terminate_link(nb);
248                                         x25_neigh_put(nb);
249                                 }
250                                 break;
251                         case NETDEV_DOWN:
252                                 x25_kill_by_device(dev);
253                                 x25_route_device_down(dev);
254                                 x25_link_device_down(dev);
255                                 break;
256                 }
257         }
258
259         return NOTIFY_DONE;
260 }
261
262 /*
263  *      Add a socket to the bound sockets list.
264  */
265 static void x25_insert_socket(struct sock *sk)
266 {
267         write_lock_bh(&x25_list_lock);
268         sk_add_node(sk, &x25_list);
269         write_unlock_bh(&x25_list_lock);
270 }
271
272 /*
273  *      Find a socket that wants to accept the Call Request we just
274  *      received. Check the full list for an address/cud match.
275  *      If no cuds match return the next_best thing, an address match.
276  *      Note: if a listening socket has cud set it must only get calls
277  *      with matching cud.
278  */
279 static struct sock *x25_find_listener(struct x25_address *addr,
280                                         struct sk_buff *skb)
281 {
282         struct sock *s;
283         struct sock *next_best;
284         struct hlist_node *node;
285
286         read_lock_bh(&x25_list_lock);
287         next_best = NULL;
288
289         sk_for_each(s, node, &x25_list)
290                 if ((!strcmp(addr->x25_addr,
291                         x25_sk(s)->source_addr.x25_addr) ||
292                                 !strcmp(addr->x25_addr,
293                                         null_x25_address.x25_addr)) &&
294                                         s->sk_state == TCP_LISTEN) {
295                         /*
296                          * Found a listening socket, now check the incoming
297                          * call user data vs this sockets call user data
298                          */
299                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
300                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301                                         skb->data,
302                                         x25_sk(s)->cudmatchlength)) == 0) {
303                                         sock_hold(s);
304                                         goto found;
305                                  }
306                         } else
307                                 next_best = s;
308                 }
309         if (next_best) {
310                 s = next_best;
311                 sock_hold(s);
312                 goto found;
313         }
314         s = NULL;
315 found:
316         read_unlock_bh(&x25_list_lock);
317         return s;
318 }
319
320 /*
321  *      Find a connected X.25 socket given my LCI and neighbour.
322  */
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325         struct sock *s;
326         struct hlist_node *node;
327
328         sk_for_each(s, node, &x25_list)
329                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330                         sock_hold(s);
331                         goto found;
332                 }
333         s = NULL;
334 found:
335         return s;
336 }
337
338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339 {
340         struct sock *s;
341
342         read_lock_bh(&x25_list_lock);
343         s = __x25_find_socket(lci, nb);
344         read_unlock_bh(&x25_list_lock);
345         return s;
346 }
347
348 /*
349  *      Find a unique LCI for a given device.
350  */
351 static unsigned int x25_new_lci(struct x25_neigh *nb)
352 {
353         unsigned int lci = 1;
354         struct sock *sk;
355
356         read_lock_bh(&x25_list_lock);
357
358         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359                 sock_put(sk);
360                 if (++lci == 4096) {
361                         lci = 0;
362                         break;
363                 }
364         }
365
366         read_unlock_bh(&x25_list_lock);
367         return lci;
368 }
369
370 /*
371  *      Deferred destroy.
372  */
373 static void __x25_destroy_socket(struct sock *);
374
375 /*
376  *      handler for deferred kills.
377  */
378 static void x25_destroy_timer(unsigned long data)
379 {
380         x25_destroy_socket_from_timer((struct sock *)data);
381 }
382
383 /*
384  *      This is called from user mode and the timers. Thus it protects itself
385  *      against interrupt users but doesn't worry about being called during
386  *      work. Once it is removed from the queue no interrupt or bottom half
387  *      will touch it and we are (fairly 8-) ) safe.
388  *      Not static as it's used by the timer
389  */
390 static void __x25_destroy_socket(struct sock *sk)
391 {
392         struct sk_buff *skb;
393
394         x25_stop_heartbeat(sk);
395         x25_stop_timer(sk);
396
397         x25_remove_socket(sk);
398         x25_clear_queues(sk);           /* Flush the queues */
399
400         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401                 if (skb->sk != sk) {            /* A pending connection */
402                         /*
403                          * Queue the unaccepted socket for death
404                          */
405                         skb->sk->sk_state = TCP_LISTEN;
406                         sock_set_flag(skb->sk, SOCK_DEAD);
407                         x25_start_heartbeat(skb->sk);
408                         x25_sk(skb->sk)->state = X25_STATE_0;
409                 }
410
411                 kfree_skb(skb);
412         }
413
414         if (sk_has_allocations(sk)) {
415                 /* Defer: outstanding buffers */
416                 sk->sk_timer.expires  = jiffies + 10 * HZ;
417                 sk->sk_timer.function = x25_destroy_timer;
418                 sk->sk_timer.data = (unsigned long)sk;
419                 add_timer(&sk->sk_timer);
420         } else {
421                 /* drop last reference so sock_put will free */
422                 __sock_put(sk);
423         }
424 }
425
426 void x25_destroy_socket_from_timer(struct sock *sk)
427 {
428         sock_hold(sk);
429         bh_lock_sock(sk);
430         __x25_destroy_socket(sk);
431         bh_unlock_sock(sk);
432         sock_put(sk);
433 }
434
435 static void x25_destroy_socket(struct sock *sk)
436 {
437         sock_hold(sk);
438         lock_sock(sk);
439         __x25_destroy_socket(sk);
440         release_sock(sk);
441         sock_put(sk);
442 }
443
444 /*
445  *      Handling for system calls applied via the various interfaces to a
446  *      X.25 socket object.
447  */
448
449 static int x25_setsockopt(struct socket *sock, int level, int optname,
450                           char __user *optval, unsigned int optlen)
451 {
452         int opt;
453         struct sock *sk = sock->sk;
454         int rc = -ENOPROTOOPT;
455
456         if (level != SOL_X25 || optname != X25_QBITINCL)
457                 goto out;
458
459         rc = -EINVAL;
460         if (optlen < sizeof(int))
461                 goto out;
462
463         rc = -EFAULT;
464         if (get_user(opt, (int __user *)optval))
465                 goto out;
466
467         if (opt)
468                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
469         else
470                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
471         rc = 0;
472 out:
473         return rc;
474 }
475
476 static int x25_getsockopt(struct socket *sock, int level, int optname,
477                           char __user *optval, int __user *optlen)
478 {
479         struct sock *sk = sock->sk;
480         int val, len, rc = -ENOPROTOOPT;
481
482         if (level != SOL_X25 || optname != X25_QBITINCL)
483                 goto out;
484
485         rc = -EFAULT;
486         if (get_user(len, optlen))
487                 goto out;
488
489         len = min_t(unsigned int, len, sizeof(int));
490
491         rc = -EINVAL;
492         if (len < 0)
493                 goto out;
494
495         rc = -EFAULT;
496         if (put_user(len, optlen))
497                 goto out;
498
499         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
500         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
501 out:
502         return rc;
503 }
504
505 static int x25_listen(struct socket *sock, int backlog)
506 {
507         struct sock *sk = sock->sk;
508         int rc = -EOPNOTSUPP;
509
510         lock_sock(sk);
511         if (sk->sk_state != TCP_LISTEN) {
512                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
513                 sk->sk_max_ack_backlog = backlog;
514                 sk->sk_state           = TCP_LISTEN;
515                 rc = 0;
516         }
517         release_sock(sk);
518
519         return rc;
520 }
521
522 static struct proto x25_proto = {
523         .name     = "X25",
524         .owner    = THIS_MODULE,
525         .obj_size = sizeof(struct x25_sock),
526 };
527
528 static struct sock *x25_alloc_socket(struct net *net)
529 {
530         struct x25_sock *x25;
531         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
532
533         if (!sk)
534                 goto out;
535
536         sock_init_data(NULL, sk);
537
538         x25 = x25_sk(sk);
539         skb_queue_head_init(&x25->ack_queue);
540         skb_queue_head_init(&x25->fragment_queue);
541         skb_queue_head_init(&x25->interrupt_in_queue);
542         skb_queue_head_init(&x25->interrupt_out_queue);
543 out:
544         return sk;
545 }
546
547 static int x25_create(struct net *net, struct socket *sock, int protocol,
548                       int kern)
549 {
550         struct sock *sk;
551         struct x25_sock *x25;
552         int rc = -EAFNOSUPPORT;
553
554         if (!net_eq(net, &init_net))
555                 goto out;
556
557         rc = -ESOCKTNOSUPPORT;
558         if (sock->type != SOCK_SEQPACKET)
559                 goto out;
560
561         rc = -EINVAL;
562         if (protocol)
563                 goto out;
564
565         rc = -ENOBUFS;
566         if ((sk = x25_alloc_socket(net)) == NULL)
567                 goto out;
568
569         x25 = x25_sk(sk);
570
571         sock_init_data(sock, sk);
572
573         x25_init_timers(sk);
574
575         sock->ops    = &x25_proto_ops;
576         sk->sk_protocol = protocol;
577         sk->sk_backlog_rcv = x25_backlog_rcv;
578
579         x25->t21   = sysctl_x25_call_request_timeout;
580         x25->t22   = sysctl_x25_reset_request_timeout;
581         x25->t23   = sysctl_x25_clear_request_timeout;
582         x25->t2    = sysctl_x25_ack_holdback_timeout;
583         x25->state = X25_STATE_0;
584         x25->cudmatchlength = 0;
585         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
586                                                         /* on call accept   */
587
588         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
589         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
590         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
591         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
592         x25->facilities.throughput  = 0;        /* by default don't negotiate
593                                                    throughput */
594         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
595         x25->dte_facilities.calling_len = 0;
596         x25->dte_facilities.called_len = 0;
597         memset(x25->dte_facilities.called_ae, '\0',
598                         sizeof(x25->dte_facilities.called_ae));
599         memset(x25->dte_facilities.calling_ae, '\0',
600                         sizeof(x25->dte_facilities.calling_ae));
601
602         rc = 0;
603 out:
604         return rc;
605 }
606
607 static struct sock *x25_make_new(struct sock *osk)
608 {
609         struct sock *sk = NULL;
610         struct x25_sock *x25, *ox25;
611
612         if (osk->sk_type != SOCK_SEQPACKET)
613                 goto out;
614
615         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
616                 goto out;
617
618         x25 = x25_sk(sk);
619
620         sk->sk_type        = osk->sk_type;
621         sk->sk_priority    = osk->sk_priority;
622         sk->sk_protocol    = osk->sk_protocol;
623         sk->sk_rcvbuf      = osk->sk_rcvbuf;
624         sk->sk_sndbuf      = osk->sk_sndbuf;
625         sk->sk_state       = TCP_ESTABLISHED;
626         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
627         sock_copy_flags(sk, osk);
628
629         ox25 = x25_sk(osk);
630         x25->t21        = ox25->t21;
631         x25->t22        = ox25->t22;
632         x25->t23        = ox25->t23;
633         x25->t2         = ox25->t2;
634         x25->flags      = ox25->flags;
635         x25->facilities = ox25->facilities;
636         x25->dte_facilities = ox25->dte_facilities;
637         x25->cudmatchlength = ox25->cudmatchlength;
638
639         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
640         x25_init_timers(sk);
641 out:
642         return sk;
643 }
644
645 static int x25_release(struct socket *sock)
646 {
647         struct sock *sk = sock->sk;
648         struct x25_sock *x25;
649
650         lock_kernel();
651         if (!sk)
652                 goto out;
653
654         x25 = x25_sk(sk);
655
656         switch (x25->state) {
657
658                 case X25_STATE_0:
659                 case X25_STATE_2:
660                         x25_disconnect(sk, 0, 0, 0);
661                         x25_destroy_socket(sk);
662                         goto out;
663
664                 case X25_STATE_1:
665                 case X25_STATE_3:
666                 case X25_STATE_4:
667                         x25_clear_queues(sk);
668                         x25_write_internal(sk, X25_CLEAR_REQUEST);
669                         x25_start_t23timer(sk);
670                         x25->state = X25_STATE_2;
671                         sk->sk_state    = TCP_CLOSE;
672                         sk->sk_shutdown |= SEND_SHUTDOWN;
673                         sk->sk_state_change(sk);
674                         sock_set_flag(sk, SOCK_DEAD);
675                         sock_set_flag(sk, SOCK_DESTROY);
676                         break;
677         }
678
679         sock_orphan(sk);
680 out:
681         unlock_kernel();
682         return 0;
683 }
684
685 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
686 {
687         struct sock *sk = sock->sk;
688         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
689         int len, i, rc = 0;
690
691         if (!sock_flag(sk, SOCK_ZAPPED) ||
692             addr_len != sizeof(struct sockaddr_x25) ||
693             addr->sx25_family != AF_X25) {
694                 rc = -EINVAL;
695                 goto out;
696         }
697
698         len = strlen(addr->sx25_addr.x25_addr);
699         for (i = 0; i < len; i++) {
700                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
701                         rc = -EINVAL;
702                         goto out;
703                 }
704         }
705
706         lock_sock(sk);
707         x25_sk(sk)->source_addr = addr->sx25_addr;
708         x25_insert_socket(sk);
709         sock_reset_flag(sk, SOCK_ZAPPED);
710         release_sock(sk);
711         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
712 out:
713         return rc;
714 }
715
716 static int x25_wait_for_connection_establishment(struct sock *sk)
717 {
718         DECLARE_WAITQUEUE(wait, current);
719         int rc;
720
721         add_wait_queue_exclusive(sk_sleep(sk), &wait);
722         for (;;) {
723                 __set_current_state(TASK_INTERRUPTIBLE);
724                 rc = -ERESTARTSYS;
725                 if (signal_pending(current))
726                         break;
727                 rc = sock_error(sk);
728                 if (rc) {
729                         sk->sk_socket->state = SS_UNCONNECTED;
730                         break;
731                 }
732                 rc = 0;
733                 if (sk->sk_state != TCP_ESTABLISHED) {
734                         release_sock(sk);
735                         schedule();
736                         lock_sock(sk);
737                 } else
738                         break;
739         }
740         __set_current_state(TASK_RUNNING);
741         remove_wait_queue(sk_sleep(sk), &wait);
742         return rc;
743 }
744
745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
746                        int addr_len, int flags)
747 {
748         struct sock *sk = sock->sk;
749         struct x25_sock *x25 = x25_sk(sk);
750         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
751         struct x25_route *rt;
752         int rc = 0;
753
754         lock_kernel();
755         lock_sock(sk);
756         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
757                 sock->state = SS_CONNECTED;
758                 goto out; /* Connect completed during a ERESTARTSYS event */
759         }
760
761         rc = -ECONNREFUSED;
762         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
763                 sock->state = SS_UNCONNECTED;
764                 goto out;
765         }
766
767         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
768         if (sk->sk_state == TCP_ESTABLISHED)
769                 goto out;
770
771         sk->sk_state   = TCP_CLOSE;
772         sock->state = SS_UNCONNECTED;
773
774         rc = -EINVAL;
775         if (addr_len != sizeof(struct sockaddr_x25) ||
776             addr->sx25_family != AF_X25)
777                 goto out;
778
779         rc = -ENETUNREACH;
780         rt = x25_get_route(&addr->sx25_addr);
781         if (!rt)
782                 goto out;
783
784         x25->neighbour = x25_get_neigh(rt->dev);
785         if (!x25->neighbour)
786                 goto out_put_route;
787
788         x25_limit_facilities(&x25->facilities, x25->neighbour);
789
790         x25->lci = x25_new_lci(x25->neighbour);
791         if (!x25->lci)
792                 goto out_put_neigh;
793
794         rc = -EINVAL;
795         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
796                 goto out_put_neigh;
797
798         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
799                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
800
801         x25->dest_addr = addr->sx25_addr;
802
803         /* Move to connecting socket, start sending Connect Requests */
804         sock->state   = SS_CONNECTING;
805         sk->sk_state  = TCP_SYN_SENT;
806
807         x25->state = X25_STATE_1;
808
809         x25_write_internal(sk, X25_CALL_REQUEST);
810
811         x25_start_heartbeat(sk);
812         x25_start_t21timer(sk);
813
814         /* Now the loop */
815         rc = -EINPROGRESS;
816         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
817                 goto out_put_neigh;
818
819         rc = x25_wait_for_connection_establishment(sk);
820         if (rc)
821                 goto out_put_neigh;
822
823         sock->state = SS_CONNECTED;
824         rc = 0;
825 out_put_neigh:
826         if (rc)
827                 x25_neigh_put(x25->neighbour);
828 out_put_route:
829         x25_route_put(rt);
830 out:
831         release_sock(sk);
832         unlock_kernel();
833         return rc;
834 }
835
836 static int x25_wait_for_data(struct sock *sk, long timeout)
837 {
838         DECLARE_WAITQUEUE(wait, current);
839         int rc = 0;
840
841         add_wait_queue_exclusive(sk_sleep(sk), &wait);
842         for (;;) {
843                 __set_current_state(TASK_INTERRUPTIBLE);
844                 if (sk->sk_shutdown & RCV_SHUTDOWN)
845                         break;
846                 rc = -ERESTARTSYS;
847                 if (signal_pending(current))
848                         break;
849                 rc = -EAGAIN;
850                 if (!timeout)
851                         break;
852                 rc = 0;
853                 if (skb_queue_empty(&sk->sk_receive_queue)) {
854                         release_sock(sk);
855                         timeout = schedule_timeout(timeout);
856                         lock_sock(sk);
857                 } else
858                         break;
859         }
860         __set_current_state(TASK_RUNNING);
861         remove_wait_queue(sk_sleep(sk), &wait);
862         return rc;
863 }
864
865 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
866 {
867         struct sock *sk = sock->sk;
868         struct sock *newsk;
869         struct sk_buff *skb;
870         int rc = -EINVAL;
871
872         if (!sk)
873                 goto out;
874
875         rc = -EOPNOTSUPP;
876         if (sk->sk_type != SOCK_SEQPACKET)
877                 goto out;
878
879         lock_sock(sk);
880         rc = -EINVAL;
881         if (sk->sk_state != TCP_LISTEN)
882                 goto out2;
883
884         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
885         if (rc)
886                 goto out2;
887         skb = skb_dequeue(&sk->sk_receive_queue);
888         rc = -EINVAL;
889         if (!skb->sk)
890                 goto out2;
891         newsk            = skb->sk;
892         sock_graft(newsk, newsock);
893
894         /* Now attach up the new socket */
895         skb->sk = NULL;
896         kfree_skb(skb);
897         sk->sk_ack_backlog--;
898         newsock->state = SS_CONNECTED;
899         rc = 0;
900 out2:
901         release_sock(sk);
902 out:
903         return rc;
904 }
905
906 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
907                        int *uaddr_len, int peer)
908 {
909         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
910         struct sock *sk = sock->sk;
911         struct x25_sock *x25 = x25_sk(sk);
912         int rc = 0;
913
914         lock_kernel();
915         if (peer) {
916                 if (sk->sk_state != TCP_ESTABLISHED) {
917                         rc = -ENOTCONN;
918                         goto out;
919                 }
920                 sx25->sx25_addr = x25->dest_addr;
921         } else
922                 sx25->sx25_addr = x25->source_addr;
923
924         sx25->sx25_family = AF_X25;
925         *uaddr_len = sizeof(*sx25);
926
927 out:
928         unlock_kernel();
929         return rc;
930 }
931
932 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
933                            poll_table *wait)
934 {
935         int rc;
936
937         lock_kernel();
938         rc = datagram_poll(file, sock, wait);
939         unlock_kernel();
940
941         return rc;
942 }
943
944 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
945                         unsigned int lci)
946 {
947         struct sock *sk;
948         struct sock *make;
949         struct x25_sock *makex25;
950         struct x25_address source_addr, dest_addr;
951         struct x25_facilities facilities;
952         struct x25_dte_facilities dte_facilities;
953         int len, addr_len, rc;
954
955         /*
956          *      Remove the LCI and frame type.
957          */
958         skb_pull(skb, X25_STD_MIN_LEN);
959
960         /*
961          *      Extract the X.25 addresses and convert them to ASCII strings,
962          *      and remove them.
963          *
964          *      Address block is mandatory in call request packets
965          */
966         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
967         if (addr_len <= 0)
968                 goto out_clear_request;
969         skb_pull(skb, addr_len);
970
971         /*
972          *      Get the length of the facilities, skip past them for the moment
973          *      get the call user data because this is needed to determine
974          *      the correct listener
975          *
976          *      Facilities length is mandatory in call request packets
977          */
978         if (skb->len < 1)
979                 goto out_clear_request;
980         len = skb->data[0] + 1;
981         if (skb->len < len)
982                 goto out_clear_request;
983         skb_pull(skb,len);
984
985         /*
986          *      Find a listener for the particular address/cud pair.
987          */
988         sk = x25_find_listener(&source_addr,skb);
989         skb_push(skb,len);
990
991         if (sk != NULL && sk_acceptq_is_full(sk)) {
992                 goto out_sock_put;
993         }
994
995         /*
996          *      We dont have any listeners for this incoming call.
997          *      Try forwarding it.
998          */
999         if (sk == NULL) {
1000                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1001                 if (sysctl_x25_forward &&
1002                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1003                 {
1004                         /* Call was forwarded, dont process it any more */
1005                         kfree_skb(skb);
1006                         rc = 1;
1007                         goto out;
1008                 } else {
1009                         /* No listeners, can't forward, clear the call */
1010                         goto out_clear_request;
1011                 }
1012         }
1013
1014         /*
1015          *      Try to reach a compromise on the requested facilities.
1016          */
1017         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1018         if (len == -1)
1019                 goto out_sock_put;
1020
1021         /*
1022          * current neighbour/link might impose additional limits
1023          * on certain facilties
1024          */
1025
1026         x25_limit_facilities(&facilities, nb);
1027
1028         /*
1029          *      Try to create a new socket.
1030          */
1031         make = x25_make_new(sk);
1032         if (!make)
1033                 goto out_sock_put;
1034
1035         /*
1036          *      Remove the facilities
1037          */
1038         skb_pull(skb, len);
1039
1040         skb->sk     = make;
1041         make->sk_state = TCP_ESTABLISHED;
1042
1043         makex25 = x25_sk(make);
1044         makex25->lci           = lci;
1045         makex25->dest_addr     = dest_addr;
1046         makex25->source_addr   = source_addr;
1047         makex25->neighbour     = nb;
1048         makex25->facilities    = facilities;
1049         makex25->dte_facilities= dte_facilities;
1050         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1051         /* ensure no reverse facil on accept */
1052         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1053         /* ensure no calling address extension on accept */
1054         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1055         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1056
1057         /* Normally all calls are accepted immediately */
1058         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1059                 x25_write_internal(make, X25_CALL_ACCEPTED);
1060                 makex25->state = X25_STATE_3;
1061         }
1062
1063         /*
1064          *      Incoming Call User Data.
1065          */
1066         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1067         makex25->calluserdata.cudlength = skb->len;
1068
1069         sk->sk_ack_backlog++;
1070
1071         x25_insert_socket(make);
1072
1073         skb_queue_head(&sk->sk_receive_queue, skb);
1074
1075         x25_start_heartbeat(make);
1076
1077         if (!sock_flag(sk, SOCK_DEAD))
1078                 sk->sk_data_ready(sk, skb->len);
1079         rc = 1;
1080         sock_put(sk);
1081 out:
1082         return rc;
1083 out_sock_put:
1084         sock_put(sk);
1085 out_clear_request:
1086         rc = 0;
1087         x25_transmit_clear_request(nb, lci, 0x01);
1088         goto out;
1089 }
1090
1091 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1092                        struct msghdr *msg, size_t len)
1093 {
1094         struct sock *sk = sock->sk;
1095         struct x25_sock *x25 = x25_sk(sk);
1096         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1097         struct sockaddr_x25 sx25;
1098         struct sk_buff *skb;
1099         unsigned char *asmptr;
1100         int noblock = msg->msg_flags & MSG_DONTWAIT;
1101         size_t size;
1102         int qbit = 0, rc = -EINVAL;
1103
1104         lock_kernel();
1105         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106                 goto out;
1107
1108         /* we currently don't support segmented records at the user interface */
1109         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110                 goto out;
1111
1112         rc = -EADDRNOTAVAIL;
1113         if (sock_flag(sk, SOCK_ZAPPED))
1114                 goto out;
1115
1116         rc = -EPIPE;
1117         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118                 send_sig(SIGPIPE, current, 0);
1119                 goto out;
1120         }
1121
1122         rc = -ENETUNREACH;
1123         if (!x25->neighbour)
1124                 goto out;
1125
1126         if (usx25) {
1127                 rc = -EINVAL;
1128                 if (msg->msg_namelen < sizeof(sx25))
1129                         goto out;
1130                 memcpy(&sx25, usx25, sizeof(sx25));
1131                 rc = -EISCONN;
1132                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133                         goto out;
1134                 rc = -EINVAL;
1135                 if (sx25.sx25_family != AF_X25)
1136                         goto out;
1137         } else {
1138                 /*
1139                  *      FIXME 1003.1g - if the socket is like this because
1140                  *      it has become closed (not started closed) we ought
1141                  *      to SIGPIPE, EPIPE;
1142                  */
1143                 rc = -ENOTCONN;
1144                 if (sk->sk_state != TCP_ESTABLISHED)
1145                         goto out;
1146
1147                 sx25.sx25_family = AF_X25;
1148                 sx25.sx25_addr   = x25->dest_addr;
1149         }
1150
1151         /* Sanity check the packet size */
1152         if (len > 65535) {
1153                 rc = -EMSGSIZE;
1154                 goto out;
1155         }
1156
1157         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158
1159         /* Build a packet */
1160         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161
1162         if ((msg->msg_flags & MSG_OOB) && len > 32)
1163                 len = 32;
1164
1165         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166
1167         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1168         if (!skb)
1169                 goto out;
1170         X25_SKB_CB(skb)->flags = msg->msg_flags;
1171
1172         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1173
1174         /*
1175          *      Put the data on the end
1176          */
1177         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1178
1179         skb_reset_transport_header(skb);
1180         skb_put(skb, len);
1181
1182         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1183         if (rc)
1184                 goto out_kfree_skb;
1185
1186         /*
1187          *      If the Q BIT Include socket option is in force, the first
1188          *      byte of the user data is the logical value of the Q Bit.
1189          */
1190         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1191                 qbit = skb->data[0];
1192                 skb_pull(skb, 1);
1193         }
1194
1195         /*
1196          *      Push down the X.25 header
1197          */
1198         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1199
1200         if (msg->msg_flags & MSG_OOB) {
1201                 if (x25->neighbour->extended) {
1202                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1203                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1204                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1205                         *asmptr++ = X25_INTERRUPT;
1206                 } else {
1207                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1208                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1209                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1210                         *asmptr++ = X25_INTERRUPT;
1211                 }
1212         } else {
1213                 if (x25->neighbour->extended) {
1214                         /* Build an Extended X.25 header */
1215                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1216                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1218                         *asmptr++ = X25_DATA;
1219                         *asmptr++ = X25_DATA;
1220                 } else {
1221                         /* Build an Standard X.25 header */
1222                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1223                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1224                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1225                         *asmptr++ = X25_DATA;
1226                 }
1227
1228                 if (qbit)
1229                         skb->data[0] |= X25_Q_BIT;
1230         }
1231
1232         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1233         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1234
1235         rc = -ENOTCONN;
1236         if (sk->sk_state != TCP_ESTABLISHED)
1237                 goto out_kfree_skb;
1238
1239         if (msg->msg_flags & MSG_OOB)
1240                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1241         else {
1242                 rc = x25_output(sk, skb);
1243                 len = rc;
1244                 if (rc < 0)
1245                         kfree_skb(skb);
1246                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1247                         len++;
1248         }
1249
1250         /*
1251          * lock_sock() is currently only used to serialize this x25_kick()
1252          * against input-driven x25_kick() calls. It currently only blocks
1253          * incoming packets for this socket and does not protect against
1254          * any other socket state changes and is not called from anywhere
1255          * else. As x25_kick() cannot block and as long as all socket
1256          * operations are BKL-wrapped, we don't need take to care about
1257          * purging the backlog queue in x25_release().
1258          *
1259          * Using lock_sock() to protect all socket operations entirely
1260          * (and making the whole x25 stack SMP aware) unfortunately would
1261          * require major changes to {send,recv}msg and skb allocation methods.
1262          * -> 2.5 ;)
1263          */
1264         lock_sock(sk);
1265         x25_kick(sk);
1266         release_sock(sk);
1267         rc = len;
1268 out:
1269         unlock_kernel();
1270         return rc;
1271 out_kfree_skb:
1272         kfree_skb(skb);
1273         goto out;
1274 }
1275
1276
1277 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1278                        struct msghdr *msg, size_t size,
1279                        int flags)
1280 {
1281         struct sock *sk = sock->sk;
1282         struct x25_sock *x25 = x25_sk(sk);
1283         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1284         size_t copied;
1285         int qbit;
1286         struct sk_buff *skb;
1287         unsigned char *asmptr;
1288         int rc = -ENOTCONN;
1289
1290         lock_kernel();
1291         /*
1292          * This works for seqpacket too. The receiver has ordered the queue for
1293          * us! We do one quick check first though
1294          */
1295         if (sk->sk_state != TCP_ESTABLISHED)
1296                 goto out;
1297
1298         if (flags & MSG_OOB) {
1299                 rc = -EINVAL;
1300                 if (sock_flag(sk, SOCK_URGINLINE) ||
1301                     !skb_peek(&x25->interrupt_in_queue))
1302                         goto out;
1303
1304                 skb = skb_dequeue(&x25->interrupt_in_queue);
1305
1306                 skb_pull(skb, X25_STD_MIN_LEN);
1307
1308                 /*
1309                  *      No Q bit information on Interrupt data.
1310                  */
1311                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1312                         asmptr  = skb_push(skb, 1);
1313                         *asmptr = 0x00;
1314                 }
1315
1316                 msg->msg_flags |= MSG_OOB;
1317         } else {
1318                 /* Now we can treat all alike */
1319                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1320                                         flags & MSG_DONTWAIT, &rc);
1321                 if (!skb)
1322                         goto out;
1323
1324                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1325
1326                 skb_pull(skb, x25->neighbour->extended ?
1327                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1328
1329                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1330                         asmptr  = skb_push(skb, 1);
1331                         *asmptr = qbit;
1332                 }
1333         }
1334
1335         skb_reset_transport_header(skb);
1336         copied = skb->len;
1337
1338         if (copied > size) {
1339                 copied = size;
1340                 msg->msg_flags |= MSG_TRUNC;
1341         }
1342
1343         /* Currently, each datagram always contains a complete record */
1344         msg->msg_flags |= MSG_EOR;
1345
1346         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1347         if (rc)
1348                 goto out_free_dgram;
1349
1350         if (sx25) {
1351                 sx25->sx25_family = AF_X25;
1352                 sx25->sx25_addr   = x25->dest_addr;
1353         }
1354
1355         msg->msg_namelen = sizeof(struct sockaddr_x25);
1356
1357         lock_sock(sk);
1358         x25_check_rbuf(sk);
1359         release_sock(sk);
1360         rc = copied;
1361 out_free_dgram:
1362         skb_free_datagram(sk, skb);
1363 out:
1364         unlock_kernel();
1365         return rc;
1366 }
1367
1368
1369 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1370 {
1371         struct sock *sk = sock->sk;
1372         struct x25_sock *x25 = x25_sk(sk);
1373         void __user *argp = (void __user *)arg;
1374         int rc;
1375
1376         lock_kernel();
1377         switch (cmd) {
1378                 case TIOCOUTQ: {
1379                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1380
1381                         if (amount < 0)
1382                                 amount = 0;
1383                         rc = put_user(amount, (unsigned int __user *)argp);
1384                         break;
1385                 }
1386
1387                 case TIOCINQ: {
1388                         struct sk_buff *skb;
1389                         int amount = 0;
1390                         /*
1391                          * These two are safe on a single CPU system as
1392                          * only user tasks fiddle here
1393                          */
1394                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1395                                 amount = skb->len;
1396                         rc = put_user(amount, (unsigned int __user *)argp);
1397                         break;
1398                 }
1399
1400                 case SIOCGSTAMP:
1401                         rc = -EINVAL;
1402                         if (sk)
1403                                 rc = sock_get_timestamp(sk,
1404                                                 (struct timeval __user *)argp);
1405                         break;
1406                 case SIOCGSTAMPNS:
1407                         rc = -EINVAL;
1408                         if (sk)
1409                                 rc = sock_get_timestampns(sk,
1410                                                 (struct timespec __user *)argp);
1411                         break;
1412                 case SIOCGIFADDR:
1413                 case SIOCSIFADDR:
1414                 case SIOCGIFDSTADDR:
1415                 case SIOCSIFDSTADDR:
1416                 case SIOCGIFBRDADDR:
1417                 case SIOCSIFBRDADDR:
1418                 case SIOCGIFNETMASK:
1419                 case SIOCSIFNETMASK:
1420                 case SIOCGIFMETRIC:
1421                 case SIOCSIFMETRIC:
1422                         rc = -EINVAL;
1423                         break;
1424                 case SIOCADDRT:
1425                 case SIOCDELRT:
1426                         rc = -EPERM;
1427                         if (!capable(CAP_NET_ADMIN))
1428                                 break;
1429                         rc = x25_route_ioctl(cmd, argp);
1430                         break;
1431                 case SIOCX25GSUBSCRIP:
1432                         rc = x25_subscr_ioctl(cmd, argp);
1433                         break;
1434                 case SIOCX25SSUBSCRIP:
1435                         rc = -EPERM;
1436                         if (!capable(CAP_NET_ADMIN))
1437                                 break;
1438                         rc = x25_subscr_ioctl(cmd, argp);
1439                         break;
1440                 case SIOCX25GFACILITIES: {
1441                         struct x25_facilities fac = x25->facilities;
1442                         rc = copy_to_user(argp, &fac,
1443                                           sizeof(fac)) ? -EFAULT : 0;
1444                         break;
1445                 }
1446
1447                 case SIOCX25SFACILITIES: {
1448                         struct x25_facilities facilities;
1449                         rc = -EFAULT;
1450                         if (copy_from_user(&facilities, argp,
1451                                            sizeof(facilities)))
1452                                 break;
1453                         rc = -EINVAL;
1454                         if (sk->sk_state != TCP_LISTEN &&
1455                             sk->sk_state != TCP_CLOSE)
1456                                 break;
1457                         if (facilities.pacsize_in < X25_PS16 ||
1458                             facilities.pacsize_in > X25_PS4096)
1459                                 break;
1460                         if (facilities.pacsize_out < X25_PS16 ||
1461                             facilities.pacsize_out > X25_PS4096)
1462                                 break;
1463                         if (facilities.winsize_in < 1 ||
1464                             facilities.winsize_in > 127)
1465                                 break;
1466                         if (facilities.throughput) {
1467                                 int out = facilities.throughput & 0xf0;
1468                                 int in  = facilities.throughput & 0x0f;
1469                                 if (!out)
1470                                         facilities.throughput |=
1471                                                 X25_DEFAULT_THROUGHPUT << 4;
1472                                 else if (out < 0x30 || out > 0xD0)
1473                                         break;
1474                                 if (!in)
1475                                         facilities.throughput |=
1476                                                 X25_DEFAULT_THROUGHPUT;
1477                                 else if (in < 0x03 || in > 0x0D)
1478                                         break;
1479                         }
1480                         if (facilities.reverse &&
1481                                 (facilities.reverse & 0x81) != 0x81)
1482                                 break;
1483                         x25->facilities = facilities;
1484                         rc = 0;
1485                         break;
1486                 }
1487
1488                 case SIOCX25GDTEFACILITIES: {
1489                         rc = copy_to_user(argp, &x25->dte_facilities,
1490                                                 sizeof(x25->dte_facilities));
1491                         if (rc)
1492                                 rc = -EFAULT;
1493                         break;
1494                 }
1495
1496                 case SIOCX25SDTEFACILITIES: {
1497                         struct x25_dte_facilities dtefacs;
1498                         rc = -EFAULT;
1499                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1500                                 break;
1501                         rc = -EINVAL;
1502                         if (sk->sk_state != TCP_LISTEN &&
1503                                         sk->sk_state != TCP_CLOSE)
1504                                 break;
1505                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1506                                 break;
1507                         if (dtefacs.calling_ae == NULL)
1508                                 break;
1509                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1510                                 break;
1511                         if (dtefacs.called_ae == NULL)
1512                                 break;
1513                         x25->dte_facilities = dtefacs;
1514                         rc = 0;
1515                         break;
1516                 }
1517
1518                 case SIOCX25GCALLUSERDATA: {
1519                         struct x25_calluserdata cud = x25->calluserdata;
1520                         rc = copy_to_user(argp, &cud,
1521                                           sizeof(cud)) ? -EFAULT : 0;
1522                         break;
1523                 }
1524
1525                 case SIOCX25SCALLUSERDATA: {
1526                         struct x25_calluserdata calluserdata;
1527
1528                         rc = -EFAULT;
1529                         if (copy_from_user(&calluserdata, argp,
1530                                            sizeof(calluserdata)))
1531                                 break;
1532                         rc = -EINVAL;
1533                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1534                                 break;
1535                         x25->calluserdata = calluserdata;
1536                         rc = 0;
1537                         break;
1538                 }
1539
1540                 case SIOCX25GCAUSEDIAG: {
1541                         struct x25_causediag causediag;
1542                         causediag = x25->causediag;
1543                         rc = copy_to_user(argp, &causediag,
1544                                           sizeof(causediag)) ? -EFAULT : 0;
1545                         break;
1546                 }
1547
1548                 case SIOCX25SCAUSEDIAG: {
1549                         struct x25_causediag causediag;
1550                         rc = -EFAULT;
1551                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1552                                 break;
1553                         x25->causediag = causediag;
1554                         rc = 0;
1555                         break;
1556
1557                 }
1558
1559                 case SIOCX25SCUDMATCHLEN: {
1560                         struct x25_subaddr sub_addr;
1561                         rc = -EINVAL;
1562                         if(sk->sk_state != TCP_CLOSE)
1563                                 break;
1564                         rc = -EFAULT;
1565                         if (copy_from_user(&sub_addr, argp,
1566                                         sizeof(sub_addr)))
1567                                 break;
1568                         rc = -EINVAL;
1569                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1570                                 break;
1571                         x25->cudmatchlength = sub_addr.cudmatchlength;
1572                         rc = 0;
1573                         break;
1574                 }
1575
1576                 case SIOCX25CALLACCPTAPPRV: {
1577                         rc = -EINVAL;
1578                         if (sk->sk_state != TCP_CLOSE)
1579                                 break;
1580                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1581                         rc = 0;
1582                         break;
1583                 }
1584
1585                 case SIOCX25SENDCALLACCPT:  {
1586                         rc = -EINVAL;
1587                         if (sk->sk_state != TCP_ESTABLISHED)
1588                                 break;
1589                         /* must call accptapprv above */
1590                         if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1591                                 break;
1592                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1593                         x25->state = X25_STATE_3;
1594                         rc = 0;
1595                         break;
1596                 }
1597
1598                 default:
1599                         rc = -ENOIOCTLCMD;
1600                         break;
1601         }
1602         unlock_kernel();
1603
1604         return rc;
1605 }
1606
1607 static const struct net_proto_family x25_family_ops = {
1608         .family =       AF_X25,
1609         .create =       x25_create,
1610         .owner  =       THIS_MODULE,
1611 };
1612
1613 #ifdef CONFIG_COMPAT
1614 static int compat_x25_subscr_ioctl(unsigned int cmd,
1615                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1616 {
1617         struct compat_x25_subscrip_struct x25_subscr;
1618         struct x25_neigh *nb;
1619         struct net_device *dev;
1620         int rc = -EINVAL;
1621
1622         rc = -EFAULT;
1623         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1624                 goto out;
1625
1626         rc = -EINVAL;
1627         dev = x25_dev_get(x25_subscr.device);
1628         if (dev == NULL)
1629                 goto out;
1630
1631         nb = x25_get_neigh(dev);
1632         if (nb == NULL)
1633                 goto out_dev_put;
1634
1635         dev_put(dev);
1636
1637         if (cmd == SIOCX25GSUBSCRIP) {
1638                 x25_subscr.extended = nb->extended;
1639                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1640                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1641                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1642         } else {
1643                 rc = -EINVAL;
1644                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1645                         rc = 0;
1646                         nb->extended = x25_subscr.extended;
1647                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1648                 }
1649         }
1650         x25_neigh_put(nb);
1651 out:
1652         return rc;
1653 out_dev_put:
1654         dev_put(dev);
1655         goto out;
1656 }
1657
1658 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1659                                 unsigned long arg)
1660 {
1661         void __user *argp = compat_ptr(arg);
1662         struct sock *sk = sock->sk;
1663
1664         int rc = -ENOIOCTLCMD;
1665
1666         switch(cmd) {
1667         case TIOCOUTQ:
1668         case TIOCINQ:
1669                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1670                 break;
1671         case SIOCGSTAMP:
1672                 rc = -EINVAL;
1673                 lock_kernel();
1674                 if (sk)
1675                         rc = compat_sock_get_timestamp(sk,
1676                                         (struct timeval __user*)argp);
1677                 unlock_kernel();
1678                 break;
1679         case SIOCGSTAMPNS:
1680                 rc = -EINVAL;
1681                 lock_kernel();
1682                 if (sk)
1683                         rc = compat_sock_get_timestampns(sk,
1684                                         (struct timespec __user*)argp);
1685                 unlock_kernel();
1686                 break;
1687         case SIOCGIFADDR:
1688         case SIOCSIFADDR:
1689         case SIOCGIFDSTADDR:
1690         case SIOCSIFDSTADDR:
1691         case SIOCGIFBRDADDR:
1692         case SIOCSIFBRDADDR:
1693         case SIOCGIFNETMASK:
1694         case SIOCSIFNETMASK:
1695         case SIOCGIFMETRIC:
1696         case SIOCSIFMETRIC:
1697                 rc = -EINVAL;
1698                 break;
1699         case SIOCADDRT:
1700         case SIOCDELRT:
1701                 rc = -EPERM;
1702                 if (!capable(CAP_NET_ADMIN))
1703                         break;
1704                 lock_kernel();
1705                 rc = x25_route_ioctl(cmd, argp);
1706                 unlock_kernel();
1707                 break;
1708         case SIOCX25GSUBSCRIP:
1709                 lock_kernel();
1710                 rc = compat_x25_subscr_ioctl(cmd, argp);
1711                 unlock_kernel();
1712                 break;
1713         case SIOCX25SSUBSCRIP:
1714                 rc = -EPERM;
1715                 if (!capable(CAP_NET_ADMIN))
1716                         break;
1717                 lock_kernel();
1718                 rc = compat_x25_subscr_ioctl(cmd, argp);
1719                 unlock_kernel();
1720                 break;
1721         case SIOCX25GFACILITIES:
1722         case SIOCX25SFACILITIES:
1723         case SIOCX25GDTEFACILITIES:
1724         case SIOCX25SDTEFACILITIES:
1725         case SIOCX25GCALLUSERDATA:
1726         case SIOCX25SCALLUSERDATA:
1727         case SIOCX25GCAUSEDIAG:
1728         case SIOCX25SCAUSEDIAG:
1729         case SIOCX25SCUDMATCHLEN:
1730         case SIOCX25CALLACCPTAPPRV:
1731         case SIOCX25SENDCALLACCPT:
1732                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1733                 break;
1734         default:
1735                 rc = -ENOIOCTLCMD;
1736                 break;
1737         }
1738         return rc;
1739 }
1740 #endif
1741
1742 static const struct proto_ops x25_proto_ops = {
1743         .family =       AF_X25,
1744         .owner =        THIS_MODULE,
1745         .release =      x25_release,
1746         .bind =         x25_bind,
1747         .connect =      x25_connect,
1748         .socketpair =   sock_no_socketpair,
1749         .accept =       x25_accept,
1750         .getname =      x25_getname,
1751         .poll =         x25_datagram_poll,
1752         .ioctl =        x25_ioctl,
1753 #ifdef CONFIG_COMPAT
1754         .compat_ioctl = compat_x25_ioctl,
1755 #endif
1756         .listen =       x25_listen,
1757         .shutdown =     sock_no_shutdown,
1758         .setsockopt =   x25_setsockopt,
1759         .getsockopt =   x25_getsockopt,
1760         .sendmsg =      x25_sendmsg,
1761         .recvmsg =      x25_recvmsg,
1762         .mmap =         sock_no_mmap,
1763         .sendpage =     sock_no_sendpage,
1764 };
1765
1766 static struct packet_type x25_packet_type __read_mostly = {
1767         .type = cpu_to_be16(ETH_P_X25),
1768         .func = x25_lapb_receive_frame,
1769 };
1770
1771 static struct notifier_block x25_dev_notifier = {
1772         .notifier_call = x25_device_event,
1773 };
1774
1775 void x25_kill_by_neigh(struct x25_neigh *nb)
1776 {
1777         struct sock *s;
1778         struct hlist_node *node;
1779
1780         write_lock_bh(&x25_list_lock);
1781
1782         sk_for_each(s, node, &x25_list)
1783                 if (x25_sk(s)->neighbour == nb)
1784                         x25_disconnect(s, ENETUNREACH, 0, 0);
1785
1786         write_unlock_bh(&x25_list_lock);
1787
1788         /* Remove any related forwards */
1789         x25_clear_forward_by_dev(nb->dev);
1790 }
1791
1792 static int __init x25_init(void)
1793 {
1794         int rc = proto_register(&x25_proto, 0);
1795
1796         if (rc != 0)
1797                 goto out;
1798
1799         rc = sock_register(&x25_family_ops);
1800         if (rc != 0)
1801                 goto out_proto;
1802
1803         dev_add_pack(&x25_packet_type);
1804
1805         rc = register_netdevice_notifier(&x25_dev_notifier);
1806         if (rc != 0)
1807                 goto out_sock;
1808
1809         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1810
1811         x25_register_sysctl();
1812         rc = x25_proc_init();
1813         if (rc != 0)
1814                 goto out_dev;
1815 out:
1816         return rc;
1817 out_dev:
1818         unregister_netdevice_notifier(&x25_dev_notifier);
1819 out_sock:
1820         sock_unregister(AF_X25);
1821 out_proto:
1822         proto_unregister(&x25_proto);
1823         goto out;
1824 }
1825 module_init(x25_init);
1826
1827 static void __exit x25_exit(void)
1828 {
1829         x25_proc_exit();
1830         x25_link_free();
1831         x25_route_free();
1832
1833         x25_unregister_sysctl();
1834
1835         unregister_netdevice_notifier(&x25_dev_notifier);
1836
1837         dev_remove_pack(&x25_packet_type);
1838
1839         sock_unregister(AF_X25);
1840         proto_unregister(&x25_proto);
1841 }
1842 module_exit(x25_exit);
1843
1844 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1845 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1846 MODULE_LICENSE("GPL");
1847 MODULE_ALIAS_NETPROTO(PF_X25);