Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
[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_sock(sk);
755         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
756                 sock->state = SS_CONNECTED;
757                 goto out; /* Connect completed during a ERESTARTSYS event */
758         }
759
760         rc = -ECONNREFUSED;
761         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
762                 sock->state = SS_UNCONNECTED;
763                 goto out;
764         }
765
766         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
767         if (sk->sk_state == TCP_ESTABLISHED)
768                 goto out;
769
770         sk->sk_state   = TCP_CLOSE;
771         sock->state = SS_UNCONNECTED;
772
773         rc = -EINVAL;
774         if (addr_len != sizeof(struct sockaddr_x25) ||
775             addr->sx25_family != AF_X25)
776                 goto out;
777
778         rc = -ENETUNREACH;
779         rt = x25_get_route(&addr->sx25_addr);
780         if (!rt)
781                 goto out;
782
783         x25->neighbour = x25_get_neigh(rt->dev);
784         if (!x25->neighbour)
785                 goto out_put_route;
786
787         x25_limit_facilities(&x25->facilities, x25->neighbour);
788
789         x25->lci = x25_new_lci(x25->neighbour);
790         if (!x25->lci)
791                 goto out_put_neigh;
792
793         rc = -EINVAL;
794         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
795                 goto out_put_neigh;
796
797         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
798                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
799
800         x25->dest_addr = addr->sx25_addr;
801
802         /* Move to connecting socket, start sending Connect Requests */
803         sock->state   = SS_CONNECTING;
804         sk->sk_state  = TCP_SYN_SENT;
805
806         x25->state = X25_STATE_1;
807
808         x25_write_internal(sk, X25_CALL_REQUEST);
809
810         x25_start_heartbeat(sk);
811         x25_start_t21timer(sk);
812
813         /* Now the loop */
814         rc = -EINPROGRESS;
815         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
816                 goto out_put_neigh;
817
818         rc = x25_wait_for_connection_establishment(sk);
819         if (rc)
820                 goto out_put_neigh;
821
822         sock->state = SS_CONNECTED;
823         rc = 0;
824 out_put_neigh:
825         if (rc)
826                 x25_neigh_put(x25->neighbour);
827 out_put_route:
828         x25_route_put(rt);
829 out:
830         release_sock(sk);
831         return rc;
832 }
833
834 static int x25_wait_for_data(struct sock *sk, long timeout)
835 {
836         DECLARE_WAITQUEUE(wait, current);
837         int rc = 0;
838
839         add_wait_queue_exclusive(sk_sleep(sk), &wait);
840         for (;;) {
841                 __set_current_state(TASK_INTERRUPTIBLE);
842                 if (sk->sk_shutdown & RCV_SHUTDOWN)
843                         break;
844                 rc = -ERESTARTSYS;
845                 if (signal_pending(current))
846                         break;
847                 rc = -EAGAIN;
848                 if (!timeout)
849                         break;
850                 rc = 0;
851                 if (skb_queue_empty(&sk->sk_receive_queue)) {
852                         release_sock(sk);
853                         timeout = schedule_timeout(timeout);
854                         lock_sock(sk);
855                 } else
856                         break;
857         }
858         __set_current_state(TASK_RUNNING);
859         remove_wait_queue(sk_sleep(sk), &wait);
860         return rc;
861 }
862
863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
864 {
865         struct sock *sk = sock->sk;
866         struct sock *newsk;
867         struct sk_buff *skb;
868         int rc = -EINVAL;
869
870         if (!sk)
871                 goto out;
872
873         rc = -EOPNOTSUPP;
874         if (sk->sk_type != SOCK_SEQPACKET)
875                 goto out;
876
877         lock_sock(sk);
878         rc = -EINVAL;
879         if (sk->sk_state != TCP_LISTEN)
880                 goto out2;
881
882         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
883         if (rc)
884                 goto out2;
885         skb = skb_dequeue(&sk->sk_receive_queue);
886         rc = -EINVAL;
887         if (!skb->sk)
888                 goto out2;
889         newsk            = skb->sk;
890         sock_graft(newsk, newsock);
891
892         /* Now attach up the new socket */
893         skb->sk = NULL;
894         kfree_skb(skb);
895         sk->sk_ack_backlog--;
896         newsock->state = SS_CONNECTED;
897         rc = 0;
898 out2:
899         release_sock(sk);
900 out:
901         return rc;
902 }
903
904 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
905                        int *uaddr_len, int peer)
906 {
907         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
908         struct sock *sk = sock->sk;
909         struct x25_sock *x25 = x25_sk(sk);
910         int rc = 0;
911
912         if (peer) {
913                 if (sk->sk_state != TCP_ESTABLISHED) {
914                         rc = -ENOTCONN;
915                         goto out;
916                 }
917                 sx25->sx25_addr = x25->dest_addr;
918         } else
919                 sx25->sx25_addr = x25->source_addr;
920
921         sx25->sx25_family = AF_X25;
922         *uaddr_len = sizeof(*sx25);
923
924 out:
925         return rc;
926 }
927
928 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
929                         unsigned int lci)
930 {
931         struct sock *sk;
932         struct sock *make;
933         struct x25_sock *makex25;
934         struct x25_address source_addr, dest_addr;
935         struct x25_facilities facilities;
936         struct x25_dte_facilities dte_facilities;
937         int len, addr_len, rc;
938
939         /*
940          *      Remove the LCI and frame type.
941          */
942         skb_pull(skb, X25_STD_MIN_LEN);
943
944         /*
945          *      Extract the X.25 addresses and convert them to ASCII strings,
946          *      and remove them.
947          *
948          *      Address block is mandatory in call request packets
949          */
950         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
951         if (addr_len <= 0)
952                 goto out_clear_request;
953         skb_pull(skb, addr_len);
954
955         /*
956          *      Get the length of the facilities, skip past them for the moment
957          *      get the call user data because this is needed to determine
958          *      the correct listener
959          *
960          *      Facilities length is mandatory in call request packets
961          */
962         if (skb->len < 1)
963                 goto out_clear_request;
964         len = skb->data[0] + 1;
965         if (skb->len < len)
966                 goto out_clear_request;
967         skb_pull(skb,len);
968
969         /*
970          *      Find a listener for the particular address/cud pair.
971          */
972         sk = x25_find_listener(&source_addr,skb);
973         skb_push(skb,len);
974
975         if (sk != NULL && sk_acceptq_is_full(sk)) {
976                 goto out_sock_put;
977         }
978
979         /*
980          *      We dont have any listeners for this incoming call.
981          *      Try forwarding it.
982          */
983         if (sk == NULL) {
984                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
985                 if (sysctl_x25_forward &&
986                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
987                 {
988                         /* Call was forwarded, dont process it any more */
989                         kfree_skb(skb);
990                         rc = 1;
991                         goto out;
992                 } else {
993                         /* No listeners, can't forward, clear the call */
994                         goto out_clear_request;
995                 }
996         }
997
998         /*
999          *      Try to reach a compromise on the requested facilities.
1000          */
1001         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1002         if (len == -1)
1003                 goto out_sock_put;
1004
1005         /*
1006          * current neighbour/link might impose additional limits
1007          * on certain facilties
1008          */
1009
1010         x25_limit_facilities(&facilities, nb);
1011
1012         /*
1013          *      Try to create a new socket.
1014          */
1015         make = x25_make_new(sk);
1016         if (!make)
1017                 goto out_sock_put;
1018
1019         /*
1020          *      Remove the facilities
1021          */
1022         skb_pull(skb, len);
1023
1024         skb->sk     = make;
1025         make->sk_state = TCP_ESTABLISHED;
1026
1027         makex25 = x25_sk(make);
1028         makex25->lci           = lci;
1029         makex25->dest_addr     = dest_addr;
1030         makex25->source_addr   = source_addr;
1031         makex25->neighbour     = nb;
1032         makex25->facilities    = facilities;
1033         makex25->dte_facilities= dte_facilities;
1034         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1035         /* ensure no reverse facil on accept */
1036         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1037         /* ensure no calling address extension on accept */
1038         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1039         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1040
1041         /* Normally all calls are accepted immediately */
1042         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1043                 x25_write_internal(make, X25_CALL_ACCEPTED);
1044                 makex25->state = X25_STATE_3;
1045         }
1046
1047         /*
1048          *      Incoming Call User Data.
1049          */
1050         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1051         makex25->calluserdata.cudlength = skb->len;
1052
1053         sk->sk_ack_backlog++;
1054
1055         x25_insert_socket(make);
1056
1057         skb_queue_head(&sk->sk_receive_queue, skb);
1058
1059         x25_start_heartbeat(make);
1060
1061         if (!sock_flag(sk, SOCK_DEAD))
1062                 sk->sk_data_ready(sk, skb->len);
1063         rc = 1;
1064         sock_put(sk);
1065 out:
1066         return rc;
1067 out_sock_put:
1068         sock_put(sk);
1069 out_clear_request:
1070         rc = 0;
1071         x25_transmit_clear_request(nb, lci, 0x01);
1072         goto out;
1073 }
1074
1075 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1076                        struct msghdr *msg, size_t len)
1077 {
1078         struct sock *sk = sock->sk;
1079         struct x25_sock *x25 = x25_sk(sk);
1080         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1081         struct sockaddr_x25 sx25;
1082         struct sk_buff *skb;
1083         unsigned char *asmptr;
1084         int noblock = msg->msg_flags & MSG_DONTWAIT;
1085         size_t size;
1086         int qbit = 0, rc = -EINVAL;
1087
1088         lock_kernel();
1089         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1090                 goto out;
1091
1092         /* we currently don't support segmented records at the user interface */
1093         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1094                 goto out;
1095
1096         rc = -EADDRNOTAVAIL;
1097         if (sock_flag(sk, SOCK_ZAPPED))
1098                 goto out;
1099
1100         rc = -EPIPE;
1101         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1102                 send_sig(SIGPIPE, current, 0);
1103                 goto out;
1104         }
1105
1106         rc = -ENETUNREACH;
1107         if (!x25->neighbour)
1108                 goto out;
1109
1110         if (usx25) {
1111                 rc = -EINVAL;
1112                 if (msg->msg_namelen < sizeof(sx25))
1113                         goto out;
1114                 memcpy(&sx25, usx25, sizeof(sx25));
1115                 rc = -EISCONN;
1116                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1117                         goto out;
1118                 rc = -EINVAL;
1119                 if (sx25.sx25_family != AF_X25)
1120                         goto out;
1121         } else {
1122                 /*
1123                  *      FIXME 1003.1g - if the socket is like this because
1124                  *      it has become closed (not started closed) we ought
1125                  *      to SIGPIPE, EPIPE;
1126                  */
1127                 rc = -ENOTCONN;
1128                 if (sk->sk_state != TCP_ESTABLISHED)
1129                         goto out;
1130
1131                 sx25.sx25_family = AF_X25;
1132                 sx25.sx25_addr   = x25->dest_addr;
1133         }
1134
1135         /* Sanity check the packet size */
1136         if (len > 65535) {
1137                 rc = -EMSGSIZE;
1138                 goto out;
1139         }
1140
1141         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1142
1143         /* Build a packet */
1144         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1145
1146         if ((msg->msg_flags & MSG_OOB) && len > 32)
1147                 len = 32;
1148
1149         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1150
1151         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1152         if (!skb)
1153                 goto out;
1154         X25_SKB_CB(skb)->flags = msg->msg_flags;
1155
1156         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1157
1158         /*
1159          *      Put the data on the end
1160          */
1161         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1162
1163         skb_reset_transport_header(skb);
1164         skb_put(skb, len);
1165
1166         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1167         if (rc)
1168                 goto out_kfree_skb;
1169
1170         /*
1171          *      If the Q BIT Include socket option is in force, the first
1172          *      byte of the user data is the logical value of the Q Bit.
1173          */
1174         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1175                 qbit = skb->data[0];
1176                 skb_pull(skb, 1);
1177         }
1178
1179         /*
1180          *      Push down the X.25 header
1181          */
1182         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1183
1184         if (msg->msg_flags & MSG_OOB) {
1185                 if (x25->neighbour->extended) {
1186                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1187                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1188                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1189                         *asmptr++ = X25_INTERRUPT;
1190                 } else {
1191                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1192                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1193                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1194                         *asmptr++ = X25_INTERRUPT;
1195                 }
1196         } else {
1197                 if (x25->neighbour->extended) {
1198                         /* Build an Extended X.25 header */
1199                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1200                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1201                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1202                         *asmptr++ = X25_DATA;
1203                         *asmptr++ = X25_DATA;
1204                 } else {
1205                         /* Build an Standard X.25 header */
1206                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1207                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1208                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1209                         *asmptr++ = X25_DATA;
1210                 }
1211
1212                 if (qbit)
1213                         skb->data[0] |= X25_Q_BIT;
1214         }
1215
1216         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1217         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1218
1219         rc = -ENOTCONN;
1220         if (sk->sk_state != TCP_ESTABLISHED)
1221                 goto out_kfree_skb;
1222
1223         if (msg->msg_flags & MSG_OOB)
1224                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1225         else {
1226                 rc = x25_output(sk, skb);
1227                 len = rc;
1228                 if (rc < 0)
1229                         kfree_skb(skb);
1230                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1231                         len++;
1232         }
1233
1234         /*
1235          * lock_sock() is currently only used to serialize this x25_kick()
1236          * against input-driven x25_kick() calls. It currently only blocks
1237          * incoming packets for this socket and does not protect against
1238          * any other socket state changes and is not called from anywhere
1239          * else. As x25_kick() cannot block and as long as all socket
1240          * operations are BKL-wrapped, we don't need take to care about
1241          * purging the backlog queue in x25_release().
1242          *
1243          * Using lock_sock() to protect all socket operations entirely
1244          * (and making the whole x25 stack SMP aware) unfortunately would
1245          * require major changes to {send,recv}msg and skb allocation methods.
1246          * -> 2.5 ;)
1247          */
1248         lock_sock(sk);
1249         x25_kick(sk);
1250         release_sock(sk);
1251         rc = len;
1252 out:
1253         unlock_kernel();
1254         return rc;
1255 out_kfree_skb:
1256         kfree_skb(skb);
1257         goto out;
1258 }
1259
1260
1261 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1262                        struct msghdr *msg, size_t size,
1263                        int flags)
1264 {
1265         struct sock *sk = sock->sk;
1266         struct x25_sock *x25 = x25_sk(sk);
1267         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1268         size_t copied;
1269         int qbit;
1270         struct sk_buff *skb;
1271         unsigned char *asmptr;
1272         int rc = -ENOTCONN;
1273
1274         lock_kernel();
1275         /*
1276          * This works for seqpacket too. The receiver has ordered the queue for
1277          * us! We do one quick check first though
1278          */
1279         if (sk->sk_state != TCP_ESTABLISHED)
1280                 goto out;
1281
1282         if (flags & MSG_OOB) {
1283                 rc = -EINVAL;
1284                 if (sock_flag(sk, SOCK_URGINLINE) ||
1285                     !skb_peek(&x25->interrupt_in_queue))
1286                         goto out;
1287
1288                 skb = skb_dequeue(&x25->interrupt_in_queue);
1289
1290                 skb_pull(skb, X25_STD_MIN_LEN);
1291
1292                 /*
1293                  *      No Q bit information on Interrupt data.
1294                  */
1295                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1296                         asmptr  = skb_push(skb, 1);
1297                         *asmptr = 0x00;
1298                 }
1299
1300                 msg->msg_flags |= MSG_OOB;
1301         } else {
1302                 /* Now we can treat all alike */
1303                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1304                                         flags & MSG_DONTWAIT, &rc);
1305                 if (!skb)
1306                         goto out;
1307
1308                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1309
1310                 skb_pull(skb, x25->neighbour->extended ?
1311                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1312
1313                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1314                         asmptr  = skb_push(skb, 1);
1315                         *asmptr = qbit;
1316                 }
1317         }
1318
1319         skb_reset_transport_header(skb);
1320         copied = skb->len;
1321
1322         if (copied > size) {
1323                 copied = size;
1324                 msg->msg_flags |= MSG_TRUNC;
1325         }
1326
1327         /* Currently, each datagram always contains a complete record */
1328         msg->msg_flags |= MSG_EOR;
1329
1330         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1331         if (rc)
1332                 goto out_free_dgram;
1333
1334         if (sx25) {
1335                 sx25->sx25_family = AF_X25;
1336                 sx25->sx25_addr   = x25->dest_addr;
1337         }
1338
1339         msg->msg_namelen = sizeof(struct sockaddr_x25);
1340
1341         lock_sock(sk);
1342         x25_check_rbuf(sk);
1343         release_sock(sk);
1344         rc = copied;
1345 out_free_dgram:
1346         skb_free_datagram(sk, skb);
1347 out:
1348         unlock_kernel();
1349         return rc;
1350 }
1351
1352
1353 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1354 {
1355         struct sock *sk = sock->sk;
1356         struct x25_sock *x25 = x25_sk(sk);
1357         void __user *argp = (void __user *)arg;
1358         int rc;
1359
1360         lock_kernel();
1361         switch (cmd) {
1362                 case TIOCOUTQ: {
1363                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1364
1365                         if (amount < 0)
1366                                 amount = 0;
1367                         rc = put_user(amount, (unsigned int __user *)argp);
1368                         break;
1369                 }
1370
1371                 case TIOCINQ: {
1372                         struct sk_buff *skb;
1373                         int amount = 0;
1374                         /*
1375                          * These two are safe on a single CPU system as
1376                          * only user tasks fiddle here
1377                          */
1378                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1379                                 amount = skb->len;
1380                         rc = put_user(amount, (unsigned int __user *)argp);
1381                         break;
1382                 }
1383
1384                 case SIOCGSTAMP:
1385                         rc = -EINVAL;
1386                         if (sk)
1387                                 rc = sock_get_timestamp(sk,
1388                                                 (struct timeval __user *)argp);
1389                         break;
1390                 case SIOCGSTAMPNS:
1391                         rc = -EINVAL;
1392                         if (sk)
1393                                 rc = sock_get_timestampns(sk,
1394                                                 (struct timespec __user *)argp);
1395                         break;
1396                 case SIOCGIFADDR:
1397                 case SIOCSIFADDR:
1398                 case SIOCGIFDSTADDR:
1399                 case SIOCSIFDSTADDR:
1400                 case SIOCGIFBRDADDR:
1401                 case SIOCSIFBRDADDR:
1402                 case SIOCGIFNETMASK:
1403                 case SIOCSIFNETMASK:
1404                 case SIOCGIFMETRIC:
1405                 case SIOCSIFMETRIC:
1406                         rc = -EINVAL;
1407                         break;
1408                 case SIOCADDRT:
1409                 case SIOCDELRT:
1410                         rc = -EPERM;
1411                         if (!capable(CAP_NET_ADMIN))
1412                                 break;
1413                         rc = x25_route_ioctl(cmd, argp);
1414                         break;
1415                 case SIOCX25GSUBSCRIP:
1416                         rc = x25_subscr_ioctl(cmd, argp);
1417                         break;
1418                 case SIOCX25SSUBSCRIP:
1419                         rc = -EPERM;
1420                         if (!capable(CAP_NET_ADMIN))
1421                                 break;
1422                         rc = x25_subscr_ioctl(cmd, argp);
1423                         break;
1424                 case SIOCX25GFACILITIES: {
1425                         struct x25_facilities fac = x25->facilities;
1426                         rc = copy_to_user(argp, &fac,
1427                                           sizeof(fac)) ? -EFAULT : 0;
1428                         break;
1429                 }
1430
1431                 case SIOCX25SFACILITIES: {
1432                         struct x25_facilities facilities;
1433                         rc = -EFAULT;
1434                         if (copy_from_user(&facilities, argp,
1435                                            sizeof(facilities)))
1436                                 break;
1437                         rc = -EINVAL;
1438                         if (sk->sk_state != TCP_LISTEN &&
1439                             sk->sk_state != TCP_CLOSE)
1440                                 break;
1441                         if (facilities.pacsize_in < X25_PS16 ||
1442                             facilities.pacsize_in > X25_PS4096)
1443                                 break;
1444                         if (facilities.pacsize_out < X25_PS16 ||
1445                             facilities.pacsize_out > X25_PS4096)
1446                                 break;
1447                         if (facilities.winsize_in < 1 ||
1448                             facilities.winsize_in > 127)
1449                                 break;
1450                         if (facilities.throughput) {
1451                                 int out = facilities.throughput & 0xf0;
1452                                 int in  = facilities.throughput & 0x0f;
1453                                 if (!out)
1454                                         facilities.throughput |=
1455                                                 X25_DEFAULT_THROUGHPUT << 4;
1456                                 else if (out < 0x30 || out > 0xD0)
1457                                         break;
1458                                 if (!in)
1459                                         facilities.throughput |=
1460                                                 X25_DEFAULT_THROUGHPUT;
1461                                 else if (in < 0x03 || in > 0x0D)
1462                                         break;
1463                         }
1464                         if (facilities.reverse &&
1465                                 (facilities.reverse & 0x81) != 0x81)
1466                                 break;
1467                         x25->facilities = facilities;
1468                         rc = 0;
1469                         break;
1470                 }
1471
1472                 case SIOCX25GDTEFACILITIES: {
1473                         rc = copy_to_user(argp, &x25->dte_facilities,
1474                                                 sizeof(x25->dte_facilities));
1475                         if (rc)
1476                                 rc = -EFAULT;
1477                         break;
1478                 }
1479
1480                 case SIOCX25SDTEFACILITIES: {
1481                         struct x25_dte_facilities dtefacs;
1482                         rc = -EFAULT;
1483                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1484                                 break;
1485                         rc = -EINVAL;
1486                         if (sk->sk_state != TCP_LISTEN &&
1487                                         sk->sk_state != TCP_CLOSE)
1488                                 break;
1489                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1490                                 break;
1491                         if (dtefacs.calling_ae == NULL)
1492                                 break;
1493                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1494                                 break;
1495                         if (dtefacs.called_ae == NULL)
1496                                 break;
1497                         x25->dte_facilities = dtefacs;
1498                         rc = 0;
1499                         break;
1500                 }
1501
1502                 case SIOCX25GCALLUSERDATA: {
1503                         struct x25_calluserdata cud = x25->calluserdata;
1504                         rc = copy_to_user(argp, &cud,
1505                                           sizeof(cud)) ? -EFAULT : 0;
1506                         break;
1507                 }
1508
1509                 case SIOCX25SCALLUSERDATA: {
1510                         struct x25_calluserdata calluserdata;
1511
1512                         rc = -EFAULT;
1513                         if (copy_from_user(&calluserdata, argp,
1514                                            sizeof(calluserdata)))
1515                                 break;
1516                         rc = -EINVAL;
1517                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1518                                 break;
1519                         x25->calluserdata = calluserdata;
1520                         rc = 0;
1521                         break;
1522                 }
1523
1524                 case SIOCX25GCAUSEDIAG: {
1525                         struct x25_causediag causediag;
1526                         causediag = x25->causediag;
1527                         rc = copy_to_user(argp, &causediag,
1528                                           sizeof(causediag)) ? -EFAULT : 0;
1529                         break;
1530                 }
1531
1532                 case SIOCX25SCAUSEDIAG: {
1533                         struct x25_causediag causediag;
1534                         rc = -EFAULT;
1535                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1536                                 break;
1537                         x25->causediag = causediag;
1538                         rc = 0;
1539                         break;
1540
1541                 }
1542
1543                 case SIOCX25SCUDMATCHLEN: {
1544                         struct x25_subaddr sub_addr;
1545                         rc = -EINVAL;
1546                         if(sk->sk_state != TCP_CLOSE)
1547                                 break;
1548                         rc = -EFAULT;
1549                         if (copy_from_user(&sub_addr, argp,
1550                                         sizeof(sub_addr)))
1551                                 break;
1552                         rc = -EINVAL;
1553                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1554                                 break;
1555                         x25->cudmatchlength = sub_addr.cudmatchlength;
1556                         rc = 0;
1557                         break;
1558                 }
1559
1560                 case SIOCX25CALLACCPTAPPRV: {
1561                         rc = -EINVAL;
1562                         if (sk->sk_state != TCP_CLOSE)
1563                                 break;
1564                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1565                         rc = 0;
1566                         break;
1567                 }
1568
1569                 case SIOCX25SENDCALLACCPT:  {
1570                         rc = -EINVAL;
1571                         if (sk->sk_state != TCP_ESTABLISHED)
1572                                 break;
1573                         /* must call accptapprv above */
1574                         if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1575                                 break;
1576                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1577                         x25->state = X25_STATE_3;
1578                         rc = 0;
1579                         break;
1580                 }
1581
1582                 default:
1583                         rc = -ENOIOCTLCMD;
1584                         break;
1585         }
1586         unlock_kernel();
1587
1588         return rc;
1589 }
1590
1591 static const struct net_proto_family x25_family_ops = {
1592         .family =       AF_X25,
1593         .create =       x25_create,
1594         .owner  =       THIS_MODULE,
1595 };
1596
1597 #ifdef CONFIG_COMPAT
1598 static int compat_x25_subscr_ioctl(unsigned int cmd,
1599                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1600 {
1601         struct compat_x25_subscrip_struct x25_subscr;
1602         struct x25_neigh *nb;
1603         struct net_device *dev;
1604         int rc = -EINVAL;
1605
1606         rc = -EFAULT;
1607         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1608                 goto out;
1609
1610         rc = -EINVAL;
1611         dev = x25_dev_get(x25_subscr.device);
1612         if (dev == NULL)
1613                 goto out;
1614
1615         nb = x25_get_neigh(dev);
1616         if (nb == NULL)
1617                 goto out_dev_put;
1618
1619         dev_put(dev);
1620
1621         if (cmd == SIOCX25GSUBSCRIP) {
1622                 x25_subscr.extended = nb->extended;
1623                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1624                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1625                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1626         } else {
1627                 rc = -EINVAL;
1628                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1629                         rc = 0;
1630                         nb->extended = x25_subscr.extended;
1631                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1632                 }
1633         }
1634         x25_neigh_put(nb);
1635 out:
1636         return rc;
1637 out_dev_put:
1638         dev_put(dev);
1639         goto out;
1640 }
1641
1642 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1643                                 unsigned long arg)
1644 {
1645         void __user *argp = compat_ptr(arg);
1646         struct sock *sk = sock->sk;
1647
1648         int rc = -ENOIOCTLCMD;
1649
1650         switch(cmd) {
1651         case TIOCOUTQ:
1652         case TIOCINQ:
1653                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1654                 break;
1655         case SIOCGSTAMP:
1656                 rc = -EINVAL;
1657                 lock_kernel();
1658                 if (sk)
1659                         rc = compat_sock_get_timestamp(sk,
1660                                         (struct timeval __user*)argp);
1661                 unlock_kernel();
1662                 break;
1663         case SIOCGSTAMPNS:
1664                 rc = -EINVAL;
1665                 lock_kernel();
1666                 if (sk)
1667                         rc = compat_sock_get_timestampns(sk,
1668                                         (struct timespec __user*)argp);
1669                 unlock_kernel();
1670                 break;
1671         case SIOCGIFADDR:
1672         case SIOCSIFADDR:
1673         case SIOCGIFDSTADDR:
1674         case SIOCSIFDSTADDR:
1675         case SIOCGIFBRDADDR:
1676         case SIOCSIFBRDADDR:
1677         case SIOCGIFNETMASK:
1678         case SIOCSIFNETMASK:
1679         case SIOCGIFMETRIC:
1680         case SIOCSIFMETRIC:
1681                 rc = -EINVAL;
1682                 break;
1683         case SIOCADDRT:
1684         case SIOCDELRT:
1685                 rc = -EPERM;
1686                 if (!capable(CAP_NET_ADMIN))
1687                         break;
1688                 lock_kernel();
1689                 rc = x25_route_ioctl(cmd, argp);
1690                 unlock_kernel();
1691                 break;
1692         case SIOCX25GSUBSCRIP:
1693                 lock_kernel();
1694                 rc = compat_x25_subscr_ioctl(cmd, argp);
1695                 unlock_kernel();
1696                 break;
1697         case SIOCX25SSUBSCRIP:
1698                 rc = -EPERM;
1699                 if (!capable(CAP_NET_ADMIN))
1700                         break;
1701                 lock_kernel();
1702                 rc = compat_x25_subscr_ioctl(cmd, argp);
1703                 unlock_kernel();
1704                 break;
1705         case SIOCX25GFACILITIES:
1706         case SIOCX25SFACILITIES:
1707         case SIOCX25GDTEFACILITIES:
1708         case SIOCX25SDTEFACILITIES:
1709         case SIOCX25GCALLUSERDATA:
1710         case SIOCX25SCALLUSERDATA:
1711         case SIOCX25GCAUSEDIAG:
1712         case SIOCX25SCAUSEDIAG:
1713         case SIOCX25SCUDMATCHLEN:
1714         case SIOCX25CALLACCPTAPPRV:
1715         case SIOCX25SENDCALLACCPT:
1716                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1717                 break;
1718         default:
1719                 rc = -ENOIOCTLCMD;
1720                 break;
1721         }
1722         return rc;
1723 }
1724 #endif
1725
1726 static const struct proto_ops x25_proto_ops = {
1727         .family =       AF_X25,
1728         .owner =        THIS_MODULE,
1729         .release =      x25_release,
1730         .bind =         x25_bind,
1731         .connect =      x25_connect,
1732         .socketpair =   sock_no_socketpair,
1733         .accept =       x25_accept,
1734         .getname =      x25_getname,
1735         .poll =         datagram_poll,
1736         .ioctl =        x25_ioctl,
1737 #ifdef CONFIG_COMPAT
1738         .compat_ioctl = compat_x25_ioctl,
1739 #endif
1740         .listen =       x25_listen,
1741         .shutdown =     sock_no_shutdown,
1742         .setsockopt =   x25_setsockopt,
1743         .getsockopt =   x25_getsockopt,
1744         .sendmsg =      x25_sendmsg,
1745         .recvmsg =      x25_recvmsg,
1746         .mmap =         sock_no_mmap,
1747         .sendpage =     sock_no_sendpage,
1748 };
1749
1750 static struct packet_type x25_packet_type __read_mostly = {
1751         .type = cpu_to_be16(ETH_P_X25),
1752         .func = x25_lapb_receive_frame,
1753 };
1754
1755 static struct notifier_block x25_dev_notifier = {
1756         .notifier_call = x25_device_event,
1757 };
1758
1759 void x25_kill_by_neigh(struct x25_neigh *nb)
1760 {
1761         struct sock *s;
1762         struct hlist_node *node;
1763
1764         write_lock_bh(&x25_list_lock);
1765
1766         sk_for_each(s, node, &x25_list)
1767                 if (x25_sk(s)->neighbour == nb)
1768                         x25_disconnect(s, ENETUNREACH, 0, 0);
1769
1770         write_unlock_bh(&x25_list_lock);
1771
1772         /* Remove any related forwards */
1773         x25_clear_forward_by_dev(nb->dev);
1774 }
1775
1776 static int __init x25_init(void)
1777 {
1778         int rc = proto_register(&x25_proto, 0);
1779
1780         if (rc != 0)
1781                 goto out;
1782
1783         rc = sock_register(&x25_family_ops);
1784         if (rc != 0)
1785                 goto out_proto;
1786
1787         dev_add_pack(&x25_packet_type);
1788
1789         rc = register_netdevice_notifier(&x25_dev_notifier);
1790         if (rc != 0)
1791                 goto out_sock;
1792
1793         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1794
1795         x25_register_sysctl();
1796         rc = x25_proc_init();
1797         if (rc != 0)
1798                 goto out_dev;
1799 out:
1800         return rc;
1801 out_dev:
1802         unregister_netdevice_notifier(&x25_dev_notifier);
1803 out_sock:
1804         sock_unregister(AF_X25);
1805 out_proto:
1806         proto_unregister(&x25_proto);
1807         goto out;
1808 }
1809 module_init(x25_init);
1810
1811 static void __exit x25_exit(void)
1812 {
1813         x25_proc_exit();
1814         x25_link_free();
1815         x25_route_free();
1816
1817         x25_unregister_sysctl();
1818
1819         unregister_netdevice_notifier(&x25_dev_notifier);
1820
1821         dev_remove_pack(&x25_packet_type);
1822
1823         sock_unregister(AF_X25);
1824         proto_unregister(&x25_proto);
1825 }
1826 module_exit(x25_exit);
1827
1828 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1829 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1830 MODULE_LICENSE("GPL");
1831 MODULE_ALIAS_NETPROTO(PF_X25);