header cleaning: don't include smp_lock.h when not used
[linux-3.10.git] / net / x25 / af_x25.c
1 /*
2  *      X.25 Packet Layer release 002
3  *
4  *      This is ALPHA test software. This code may break your machine,
5  *      randomly fail to work with new releases, misbehave and/or generally
6  *      screw up. It might even work.
7  *
8  *      This code REQUIRES 2.1.15 or higher
9  *
10  *      This module:
11  *              This module is free software; you can redistribute it and/or
12  *              modify it under the terms of the GNU General Public License
13  *              as published by the Free Software Foundation; either version
14  *              2 of the License, or (at your option) any later version.
15  *
16  *      History
17  *      X.25 001        Jonathan Naylor Started coding.
18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
19  *                                      New timer architecture.
20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
22  *                                        facilities negotiation and increased
23  *                                        the throughput upper limit.
24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
26  *                                      Fixed x25_output() related skb leakage.
27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31  *                                      x25_proc.c, using seq_file
32  *      2005-04-02      Shaun Pereira   Selective sub address matching
33  *                                      with call user data
34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
35  *                                      response
36  */
37
38 #include <linux/module.h>
39 #include <linux/capability.h>
40 #include <linux/errno.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/timer.h>
44 #include <linux/string.h>
45 #include <linux/net.h>
46 #include <linux/netdevice.h>
47 #include <linux/if_arp.h>
48 #include <linux/skbuff.h>
49 #include <net/sock.h>
50 #include <net/tcp_states.h>
51 #include <asm/uaccess.h>
52 #include <linux/fcntl.h>
53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
54 #include <linux/notifier.h>
55 #include <linux/init.h>
56 #include <linux/compat.h>
57
58 #include <net/x25.h>
59 #include <net/compat.h>
60
61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
66 int sysctl_x25_forward                 = 0;
67
68 HLIST_HEAD(x25_list);
69 DEFINE_RWLOCK(x25_list_lock);
70
71 static const struct proto_ops x25_proto_ops;
72
73 static struct x25_address null_x25_address = {"               "};
74
75 #ifdef CONFIG_COMPAT
76 struct compat_x25_subscrip_struct {
77         char device[200-sizeof(compat_ulong_t)];
78         compat_ulong_t global_facil_mask;
79         compat_uint_t extended;
80 };
81 #endif
82
83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
84                   struct x25_address *calling_addr)
85 {
86         int called_len, calling_len;
87         char *called, *calling;
88         int i;
89
90         called_len  = (*p >> 0) & 0x0F;
91         calling_len = (*p >> 4) & 0x0F;
92
93         called  = called_addr->x25_addr;
94         calling = calling_addr->x25_addr;
95         p++;
96
97         for (i = 0; i < (called_len + calling_len); i++) {
98                 if (i < called_len) {
99                         if (i % 2 != 0) {
100                                 *called++ = ((*p >> 0) & 0x0F) + '0';
101                                 p++;
102                         } else {
103                                 *called++ = ((*p >> 4) & 0x0F) + '0';
104                         }
105                 } else {
106                         if (i % 2 != 0) {
107                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
108                                 p++;
109                         } else {
110                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
111                         }
112                 }
113         }
114
115         *called = *calling = '\0';
116
117         return 1 + (called_len + calling_len + 1) / 2;
118 }
119
120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
121                   struct x25_address *calling_addr)
122 {
123         unsigned int called_len, calling_len;
124         char *called, *calling;
125         int i;
126
127         called  = called_addr->x25_addr;
128         calling = calling_addr->x25_addr;
129
130         called_len  = strlen(called);
131         calling_len = strlen(calling);
132
133         *p++ = (calling_len << 4) | (called_len << 0);
134
135         for (i = 0; i < (called_len + calling_len); i++) {
136                 if (i < called_len) {
137                         if (i % 2 != 0) {
138                                 *p |= (*called++ - '0') << 0;
139                                 p++;
140                         } else {
141                                 *p = 0x00;
142                                 *p |= (*called++ - '0') << 4;
143                         }
144                 } else {
145                         if (i % 2 != 0) {
146                                 *p |= (*calling++ - '0') << 0;
147                                 p++;
148                         } else {
149                                 *p = 0x00;
150                                 *p |= (*calling++ - '0') << 4;
151                         }
152                 }
153         }
154
155         return 1 + (called_len + calling_len + 1) / 2;
156 }
157
158 /*
159  *      Socket removal during an interrupt is now safe.
160  */
161 static void x25_remove_socket(struct sock *sk)
162 {
163         write_lock_bh(&x25_list_lock);
164         sk_del_node_init(sk);
165         write_unlock_bh(&x25_list_lock);
166 }
167
168 /*
169  *      Kill all bound sockets on a dropped device.
170  */
171 static void x25_kill_by_device(struct net_device *dev)
172 {
173         struct sock *s;
174         struct hlist_node *node;
175
176         write_lock_bh(&x25_list_lock);
177
178         sk_for_each(s, node, &x25_list)
179                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
180                         x25_disconnect(s, ENETUNREACH, 0, 0);
181
182         write_unlock_bh(&x25_list_lock);
183 }
184
185 /*
186  *      Handle device status changes.
187  */
188 static int x25_device_event(struct notifier_block *this, unsigned long event,
189                             void *ptr)
190 {
191         struct net_device *dev = ptr;
192         struct x25_neigh *nb;
193
194         if (dev->type == ARPHRD_X25
195 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
196          || dev->type == ARPHRD_ETHER
197 #endif
198          ) {
199                 switch (event) {
200                         case NETDEV_UP:
201                                 x25_link_device_up(dev);
202                                 break;
203                         case NETDEV_GOING_DOWN:
204                                 nb = x25_get_neigh(dev);
205                                 if (nb) {
206                                         x25_terminate_link(nb);
207                                         x25_neigh_put(nb);
208                                 }
209                                 break;
210                         case NETDEV_DOWN:
211                                 x25_kill_by_device(dev);
212                                 x25_route_device_down(dev);
213                                 x25_link_device_down(dev);
214                                 break;
215                 }
216         }
217
218         return NOTIFY_DONE;
219 }
220
221 /*
222  *      Add a socket to the bound sockets list.
223  */
224 static void x25_insert_socket(struct sock *sk)
225 {
226         write_lock_bh(&x25_list_lock);
227         sk_add_node(sk, &x25_list);
228         write_unlock_bh(&x25_list_lock);
229 }
230
231 /*
232  *      Find a socket that wants to accept the Call Request we just
233  *      received. Check the full list for an address/cud match.
234  *      If no cuds match return the next_best thing, an address match.
235  *      Note: if a listening socket has cud set it must only get calls
236  *      with matching cud.
237  */
238 static struct sock *x25_find_listener(struct x25_address *addr,
239                                         struct sk_buff *skb)
240 {
241         struct sock *s;
242         struct sock *next_best;
243         struct hlist_node *node;
244
245         read_lock_bh(&x25_list_lock);
246         next_best = NULL;
247
248         sk_for_each(s, node, &x25_list)
249                 if ((!strcmp(addr->x25_addr,
250                         x25_sk(s)->source_addr.x25_addr) ||
251                                 !strcmp(addr->x25_addr,
252                                         null_x25_address.x25_addr)) &&
253                                         s->sk_state == TCP_LISTEN) {
254                         /*
255                          * Found a listening socket, now check the incoming
256                          * call user data vs this sockets call user data
257                          */
258                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
259                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
260                                         skb->data,
261                                         x25_sk(s)->cudmatchlength)) == 0) {
262                                         sock_hold(s);
263                                         goto found;
264                                  }
265                         } else
266                                 next_best = s;
267                 }
268         if (next_best) {
269                 s = next_best;
270                 sock_hold(s);
271                 goto found;
272         }
273         s = NULL;
274 found:
275         read_unlock_bh(&x25_list_lock);
276         return s;
277 }
278
279 /*
280  *      Find a connected X.25 socket given my LCI and neighbour.
281  */
282 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
283 {
284         struct sock *s;
285         struct hlist_node *node;
286
287         sk_for_each(s, node, &x25_list)
288                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
289                         sock_hold(s);
290                         goto found;
291                 }
292         s = NULL;
293 found:
294         return s;
295 }
296
297 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
298 {
299         struct sock *s;
300
301         read_lock_bh(&x25_list_lock);
302         s = __x25_find_socket(lci, nb);
303         read_unlock_bh(&x25_list_lock);
304         return s;
305 }
306
307 /*
308  *      Find a unique LCI for a given device.
309  */
310 static unsigned int x25_new_lci(struct x25_neigh *nb)
311 {
312         unsigned int lci = 1;
313         struct sock *sk;
314
315         read_lock_bh(&x25_list_lock);
316
317         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
318                 sock_put(sk);
319                 if (++lci == 4096) {
320                         lci = 0;
321                         break;
322                 }
323         }
324
325         read_unlock_bh(&x25_list_lock);
326         return lci;
327 }
328
329 /*
330  *      Deferred destroy.
331  */
332 void x25_destroy_socket(struct sock *);
333
334 /*
335  *      handler for deferred kills.
336  */
337 static void x25_destroy_timer(unsigned long data)
338 {
339         x25_destroy_socket((struct sock *)data);
340 }
341
342 /*
343  *      This is called from user mode and the timers. Thus it protects itself
344  *      against interrupt users but doesn't worry about being called during
345  *      work. Once it is removed from the queue no interrupt or bottom half
346  *      will touch it and we are (fairly 8-) ) safe.
347  *      Not static as it's used by the timer
348  */
349 void x25_destroy_socket(struct sock *sk)
350 {
351         struct sk_buff *skb;
352
353         sock_hold(sk);
354         lock_sock(sk);
355         x25_stop_heartbeat(sk);
356         x25_stop_timer(sk);
357
358         x25_remove_socket(sk);
359         x25_clear_queues(sk);           /* Flush the queues */
360
361         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
362                 if (skb->sk != sk) {            /* A pending connection */
363                         /*
364                          * Queue the unaccepted socket for death
365                          */
366                         sock_set_flag(skb->sk, SOCK_DEAD);
367                         x25_start_heartbeat(skb->sk);
368                         x25_sk(skb->sk)->state = X25_STATE_0;
369                 }
370
371                 kfree_skb(skb);
372         }
373
374         if (atomic_read(&sk->sk_wmem_alloc) ||
375             atomic_read(&sk->sk_rmem_alloc)) {
376                 /* Defer: outstanding buffers */
377                 sk->sk_timer.expires  = jiffies + 10 * HZ;
378                 sk->sk_timer.function = x25_destroy_timer;
379                 sk->sk_timer.data = (unsigned long)sk;
380                 add_timer(&sk->sk_timer);
381         } else {
382                 /* drop last reference so sock_put will free */
383                 __sock_put(sk);
384         }
385
386         release_sock(sk);
387         sock_put(sk);
388 }
389
390 /*
391  *      Handling for system calls applied via the various interfaces to a
392  *      X.25 socket object.
393  */
394
395 static int x25_setsockopt(struct socket *sock, int level, int optname,
396                           char __user *optval, int optlen)
397 {
398         int opt;
399         struct sock *sk = sock->sk;
400         int rc = -ENOPROTOOPT;
401
402         if (level != SOL_X25 || optname != X25_QBITINCL)
403                 goto out;
404
405         rc = -EINVAL;
406         if (optlen < sizeof(int))
407                 goto out;
408
409         rc = -EFAULT;
410         if (get_user(opt, (int __user *)optval))
411                 goto out;
412
413         x25_sk(sk)->qbitincl = !!opt;
414         rc = 0;
415 out:
416         return rc;
417 }
418
419 static int x25_getsockopt(struct socket *sock, int level, int optname,
420                           char __user *optval, int __user *optlen)
421 {
422         struct sock *sk = sock->sk;
423         int val, len, rc = -ENOPROTOOPT;
424
425         if (level != SOL_X25 || optname != X25_QBITINCL)
426                 goto out;
427
428         rc = -EFAULT;
429         if (get_user(len, optlen))
430                 goto out;
431
432         len = min_t(unsigned int, len, sizeof(int));
433
434         rc = -EINVAL;
435         if (len < 0)
436                 goto out;
437
438         rc = -EFAULT;
439         if (put_user(len, optlen))
440                 goto out;
441
442         val = x25_sk(sk)->qbitincl;
443         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
444 out:
445         return rc;
446 }
447
448 static int x25_listen(struct socket *sock, int backlog)
449 {
450         struct sock *sk = sock->sk;
451         int rc = -EOPNOTSUPP;
452
453         if (sk->sk_state != TCP_LISTEN) {
454                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
455                 sk->sk_max_ack_backlog = backlog;
456                 sk->sk_state           = TCP_LISTEN;
457                 rc = 0;
458         }
459
460         return rc;
461 }
462
463 static struct proto x25_proto = {
464         .name     = "X25",
465         .owner    = THIS_MODULE,
466         .obj_size = sizeof(struct x25_sock),
467 };
468
469 static struct sock *x25_alloc_socket(void)
470 {
471         struct x25_sock *x25;
472         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
473
474         if (!sk)
475                 goto out;
476
477         sock_init_data(NULL, sk);
478
479         x25 = x25_sk(sk);
480         skb_queue_head_init(&x25->ack_queue);
481         skb_queue_head_init(&x25->fragment_queue);
482         skb_queue_head_init(&x25->interrupt_in_queue);
483         skb_queue_head_init(&x25->interrupt_out_queue);
484 out:
485         return sk;
486 }
487
488 static int x25_create(struct socket *sock, int protocol)
489 {
490         struct sock *sk;
491         struct x25_sock *x25;
492         int rc = -ESOCKTNOSUPPORT;
493
494         if (sock->type != SOCK_SEQPACKET || protocol)
495                 goto out;
496
497         rc = -ENOMEM;
498         if ((sk = x25_alloc_socket()) == NULL)
499                 goto out;
500
501         x25 = x25_sk(sk);
502
503         sock_init_data(sock, sk);
504
505         x25_init_timers(sk);
506
507         sock->ops    = &x25_proto_ops;
508         sk->sk_protocol = protocol;
509         sk->sk_backlog_rcv = x25_backlog_rcv;
510
511         x25->t21   = sysctl_x25_call_request_timeout;
512         x25->t22   = sysctl_x25_reset_request_timeout;
513         x25->t23   = sysctl_x25_clear_request_timeout;
514         x25->t2    = sysctl_x25_ack_holdback_timeout;
515         x25->state = X25_STATE_0;
516         x25->cudmatchlength = 0;
517         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
518                                                         /* on call accept   */
519
520         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
521         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
522         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
523         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
524         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
525         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
526         x25->dte_facilities.calling_len = 0;
527         x25->dte_facilities.called_len = 0;
528         memset(x25->dte_facilities.called_ae, '\0',
529                         sizeof(x25->dte_facilities.called_ae));
530         memset(x25->dte_facilities.calling_ae, '\0',
531                         sizeof(x25->dte_facilities.calling_ae));
532
533         rc = 0;
534 out:
535         return rc;
536 }
537
538 static struct sock *x25_make_new(struct sock *osk)
539 {
540         struct sock *sk = NULL;
541         struct x25_sock *x25, *ox25;
542
543         if (osk->sk_type != SOCK_SEQPACKET)
544                 goto out;
545
546         if ((sk = x25_alloc_socket()) == NULL)
547                 goto out;
548
549         x25 = x25_sk(sk);
550
551         sk->sk_type        = osk->sk_type;
552         sk->sk_socket      = osk->sk_socket;
553         sk->sk_priority    = osk->sk_priority;
554         sk->sk_protocol    = osk->sk_protocol;
555         sk->sk_rcvbuf      = osk->sk_rcvbuf;
556         sk->sk_sndbuf      = osk->sk_sndbuf;
557         sk->sk_state       = TCP_ESTABLISHED;
558         sk->sk_sleep       = osk->sk_sleep;
559         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
560         sock_copy_flags(sk, osk);
561
562         ox25 = x25_sk(osk);
563         x25->t21        = ox25->t21;
564         x25->t22        = ox25->t22;
565         x25->t23        = ox25->t23;
566         x25->t2         = ox25->t2;
567         x25->facilities = ox25->facilities;
568         x25->qbitincl   = ox25->qbitincl;
569         x25->dte_facilities = ox25->dte_facilities;
570         x25->cudmatchlength = ox25->cudmatchlength;
571         x25->accptapprv = ox25->accptapprv;
572
573         x25_init_timers(sk);
574 out:
575         return sk;
576 }
577
578 static int x25_release(struct socket *sock)
579 {
580         struct sock *sk = sock->sk;
581         struct x25_sock *x25;
582
583         if (!sk)
584                 goto out;
585
586         x25 = x25_sk(sk);
587
588         switch (x25->state) {
589
590                 case X25_STATE_0:
591                 case X25_STATE_2:
592                         x25_disconnect(sk, 0, 0, 0);
593                         x25_destroy_socket(sk);
594                         goto out;
595
596                 case X25_STATE_1:
597                 case X25_STATE_3:
598                 case X25_STATE_4:
599                         x25_clear_queues(sk);
600                         x25_write_internal(sk, X25_CLEAR_REQUEST);
601                         x25_start_t23timer(sk);
602                         x25->state = X25_STATE_2;
603                         sk->sk_state    = TCP_CLOSE;
604                         sk->sk_shutdown |= SEND_SHUTDOWN;
605                         sk->sk_state_change(sk);
606                         sock_set_flag(sk, SOCK_DEAD);
607                         sock_set_flag(sk, SOCK_DESTROY);
608                         break;
609         }
610
611         sock->sk        = NULL;
612         sk->sk_socket   = NULL; /* Not used, but we should do this */
613 out:
614         return 0;
615 }
616
617 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
618 {
619         struct sock *sk = sock->sk;
620         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
621
622         if (!sock_flag(sk, SOCK_ZAPPED) ||
623             addr_len != sizeof(struct sockaddr_x25) ||
624             addr->sx25_family != AF_X25)
625                 return -EINVAL;
626
627         x25_sk(sk)->source_addr = addr->sx25_addr;
628         x25_insert_socket(sk);
629         sock_reset_flag(sk, SOCK_ZAPPED);
630         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
631
632         return 0;
633 }
634
635 static int x25_wait_for_connection_establishment(struct sock *sk)
636 {
637         DECLARE_WAITQUEUE(wait, current);
638         int rc;
639
640         add_wait_queue_exclusive(sk->sk_sleep, &wait);
641         for (;;) {
642                 __set_current_state(TASK_INTERRUPTIBLE);
643                 rc = -ERESTARTSYS;
644                 if (signal_pending(current))
645                         break;
646                 rc = sock_error(sk);
647                 if (rc) {
648                         sk->sk_socket->state = SS_UNCONNECTED;
649                         break;
650                 }
651                 rc = 0;
652                 if (sk->sk_state != TCP_ESTABLISHED) {
653                         release_sock(sk);
654                         schedule();
655                         lock_sock(sk);
656                 } else
657                         break;
658         }
659         __set_current_state(TASK_RUNNING);
660         remove_wait_queue(sk->sk_sleep, &wait);
661         return rc;
662 }
663
664 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
665                        int addr_len, int flags)
666 {
667         struct sock *sk = sock->sk;
668         struct x25_sock *x25 = x25_sk(sk);
669         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
670         struct x25_route *rt;
671         int rc = 0;
672
673         lock_sock(sk);
674         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
675                 sock->state = SS_CONNECTED;
676                 goto out; /* Connect completed during a ERESTARTSYS event */
677         }
678
679         rc = -ECONNREFUSED;
680         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
681                 sock->state = SS_UNCONNECTED;
682                 goto out;
683         }
684
685         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
686         if (sk->sk_state == TCP_ESTABLISHED)
687                 goto out;
688
689         sk->sk_state   = TCP_CLOSE;
690         sock->state = SS_UNCONNECTED;
691
692         rc = -EINVAL;
693         if (addr_len != sizeof(struct sockaddr_x25) ||
694             addr->sx25_family != AF_X25)
695                 goto out;
696
697         rc = -ENETUNREACH;
698         rt = x25_get_route(&addr->sx25_addr);
699         if (!rt)
700                 goto out;
701
702         x25->neighbour = x25_get_neigh(rt->dev);
703         if (!x25->neighbour)
704                 goto out_put_route;
705
706         x25_limit_facilities(&x25->facilities, x25->neighbour);
707
708         x25->lci = x25_new_lci(x25->neighbour);
709         if (!x25->lci)
710                 goto out_put_neigh;
711
712         rc = -EINVAL;
713         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
714                 goto out_put_neigh;
715
716         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
717                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
718
719         x25->dest_addr = addr->sx25_addr;
720
721         /* Move to connecting socket, start sending Connect Requests */
722         sock->state   = SS_CONNECTING;
723         sk->sk_state  = TCP_SYN_SENT;
724
725         x25->state = X25_STATE_1;
726
727         x25_write_internal(sk, X25_CALL_REQUEST);
728
729         x25_start_heartbeat(sk);
730         x25_start_t21timer(sk);
731
732         /* Now the loop */
733         rc = -EINPROGRESS;
734         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
735                 goto out_put_neigh;
736
737         rc = x25_wait_for_connection_establishment(sk);
738         if (rc)
739                 goto out_put_neigh;
740
741         sock->state = SS_CONNECTED;
742         rc = 0;
743 out_put_neigh:
744         if (rc)
745                 x25_neigh_put(x25->neighbour);
746 out_put_route:
747         x25_route_put(rt);
748 out:
749         release_sock(sk);
750         return rc;
751 }
752
753 static int x25_wait_for_data(struct sock *sk, long timeout)
754 {
755         DECLARE_WAITQUEUE(wait, current);
756         int rc = 0;
757
758         add_wait_queue_exclusive(sk->sk_sleep, &wait);
759         for (;;) {
760                 __set_current_state(TASK_INTERRUPTIBLE);
761                 if (sk->sk_shutdown & RCV_SHUTDOWN)
762                         break;
763                 rc = -ERESTARTSYS;
764                 if (signal_pending(current))
765                         break;
766                 rc = -EAGAIN;
767                 if (!timeout)
768                         break;
769                 rc = 0;
770                 if (skb_queue_empty(&sk->sk_receive_queue)) {
771                         release_sock(sk);
772                         timeout = schedule_timeout(timeout);
773                         lock_sock(sk);
774                 } else
775                         break;
776         }
777         __set_current_state(TASK_RUNNING);
778         remove_wait_queue(sk->sk_sleep, &wait);
779         return rc;
780 }
781
782 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
783 {
784         struct sock *sk = sock->sk;
785         struct sock *newsk;
786         struct sk_buff *skb;
787         int rc = -EINVAL;
788
789         if (!sk || sk->sk_state != TCP_LISTEN)
790                 goto out;
791
792         rc = -EOPNOTSUPP;
793         if (sk->sk_type != SOCK_SEQPACKET)
794                 goto out;
795
796         lock_sock(sk);
797         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
798         if (rc)
799                 goto out2;
800         skb = skb_dequeue(&sk->sk_receive_queue);
801         rc = -EINVAL;
802         if (!skb->sk)
803                 goto out2;
804         newsk            = skb->sk;
805         newsk->sk_socket = newsock;
806         newsk->sk_sleep  = &newsock->wait;
807
808         /* Now attach up the new socket */
809         skb->sk = NULL;
810         kfree_skb(skb);
811         sk->sk_ack_backlog--;
812         newsock->sk    = newsk;
813         newsock->state = SS_CONNECTED;
814         rc = 0;
815 out2:
816         release_sock(sk);
817 out:
818         return rc;
819 }
820
821 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
822                        int *uaddr_len, int peer)
823 {
824         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
825         struct sock *sk = sock->sk;
826         struct x25_sock *x25 = x25_sk(sk);
827
828         if (peer) {
829                 if (sk->sk_state != TCP_ESTABLISHED)
830                         return -ENOTCONN;
831                 sx25->sx25_addr = x25->dest_addr;
832         } else
833                 sx25->sx25_addr = x25->source_addr;
834
835         sx25->sx25_family = AF_X25;
836         *uaddr_len = sizeof(*sx25);
837
838         return 0;
839 }
840
841 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
842                         unsigned int lci)
843 {
844         struct sock *sk;
845         struct sock *make;
846         struct x25_sock *makex25;
847         struct x25_address source_addr, dest_addr;
848         struct x25_facilities facilities;
849         struct x25_dte_facilities dte_facilities;
850         int len, addr_len, rc;
851
852         /*
853          *      Remove the LCI and frame type.
854          */
855         skb_pull(skb, X25_STD_MIN_LEN);
856
857         /*
858          *      Extract the X.25 addresses and convert them to ASCII strings,
859          *      and remove them.
860          */
861         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
862         skb_pull(skb, addr_len);
863
864         /*
865          *      Get the length of the facilities, skip past them for the moment
866          *      get the call user data because this is needed to determine
867          *      the correct listener
868          */
869         len = skb->data[0] + 1;
870         skb_pull(skb,len);
871
872         /*
873          *      Find a listener for the particular address/cud pair.
874          */
875         sk = x25_find_listener(&source_addr,skb);
876         skb_push(skb,len);
877
878         if (sk != NULL && sk_acceptq_is_full(sk)) {
879                 goto out_sock_put;
880         }
881
882         /*
883          *      We dont have any listeners for this incoming call.
884          *      Try forwarding it.
885          */
886         if (sk == NULL) {
887                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
888                 if (sysctl_x25_forward &&
889                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
890                 {
891                         /* Call was forwarded, dont process it any more */
892                         kfree_skb(skb);
893                         rc = 1;
894                         goto out;
895                 } else {
896                         /* No listeners, can't forward, clear the call */
897                         goto out_clear_request;
898                 }
899         }
900
901         /*
902          *      Try to reach a compromise on the requested facilities.
903          */
904         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
905         if (len == -1)
906                 goto out_sock_put;
907
908         /*
909          * current neighbour/link might impose additional limits
910          * on certain facilties
911          */
912
913         x25_limit_facilities(&facilities, nb);
914
915         /*
916          *      Try to create a new socket.
917          */
918         make = x25_make_new(sk);
919         if (!make)
920                 goto out_sock_put;
921
922         /*
923          *      Remove the facilities
924          */
925         skb_pull(skb, len);
926
927         skb->sk     = make;
928         make->sk_state = TCP_ESTABLISHED;
929
930         makex25 = x25_sk(make);
931         makex25->lci           = lci;
932         makex25->dest_addr     = dest_addr;
933         makex25->source_addr   = source_addr;
934         makex25->neighbour     = nb;
935         makex25->facilities    = facilities;
936         makex25->dte_facilities= dte_facilities;
937         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
938         /* ensure no reverse facil on accept */
939         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
940         /* ensure no calling address extension on accept */
941         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
942         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
943
944         /* Normally all calls are accepted immediatly */
945         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
946                 x25_write_internal(make, X25_CALL_ACCEPTED);
947                 makex25->state = X25_STATE_3;
948         }
949
950         /*
951          *      Incoming Call User Data.
952          */
953         if (skb->len >= 0) {
954                 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
955                 makex25->calluserdata.cudlength = skb->len;
956         }
957
958         sk->sk_ack_backlog++;
959
960         x25_insert_socket(make);
961
962         skb_queue_head(&sk->sk_receive_queue, skb);
963
964         x25_start_heartbeat(make);
965
966         if (!sock_flag(sk, SOCK_DEAD))
967                 sk->sk_data_ready(sk, skb->len);
968         rc = 1;
969         sock_put(sk);
970 out:
971         return rc;
972 out_sock_put:
973         sock_put(sk);
974 out_clear_request:
975         rc = 0;
976         x25_transmit_clear_request(nb, lci, 0x01);
977         goto out;
978 }
979
980 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
981                        struct msghdr *msg, size_t len)
982 {
983         struct sock *sk = sock->sk;
984         struct x25_sock *x25 = x25_sk(sk);
985         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
986         struct sockaddr_x25 sx25;
987         struct sk_buff *skb;
988         unsigned char *asmptr;
989         int noblock = msg->msg_flags & MSG_DONTWAIT;
990         size_t size;
991         int qbit = 0, rc = -EINVAL;
992
993         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
994                 goto out;
995
996         /* we currently don't support segmented records at the user interface */
997         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
998                 goto out;
999
1000         rc = -EADDRNOTAVAIL;
1001         if (sock_flag(sk, SOCK_ZAPPED))
1002                 goto out;
1003
1004         rc = -EPIPE;
1005         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1006                 send_sig(SIGPIPE, current, 0);
1007                 goto out;
1008         }
1009
1010         rc = -ENETUNREACH;
1011         if (!x25->neighbour)
1012                 goto out;
1013
1014         if (usx25) {
1015                 rc = -EINVAL;
1016                 if (msg->msg_namelen < sizeof(sx25))
1017                         goto out;
1018                 memcpy(&sx25, usx25, sizeof(sx25));
1019                 rc = -EISCONN;
1020                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1021                         goto out;
1022                 rc = -EINVAL;
1023                 if (sx25.sx25_family != AF_X25)
1024                         goto out;
1025         } else {
1026                 /*
1027                  *      FIXME 1003.1g - if the socket is like this because
1028                  *      it has become closed (not started closed) we ought
1029                  *      to SIGPIPE, EPIPE;
1030                  */
1031                 rc = -ENOTCONN;
1032                 if (sk->sk_state != TCP_ESTABLISHED)
1033                         goto out;
1034
1035                 sx25.sx25_family = AF_X25;
1036                 sx25.sx25_addr   = x25->dest_addr;
1037         }
1038
1039         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1040
1041         /* Build a packet */
1042         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1043
1044         if ((msg->msg_flags & MSG_OOB) && len > 32)
1045                 len = 32;
1046
1047         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1048
1049         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1050         if (!skb)
1051                 goto out;
1052         X25_SKB_CB(skb)->flags = msg->msg_flags;
1053
1054         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1055
1056         /*
1057          *      Put the data on the end
1058          */
1059         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1060
1061         skb_reset_transport_header(skb);
1062         skb_put(skb, len);
1063
1064         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1065         if (rc)
1066                 goto out_kfree_skb;
1067
1068         /*
1069          *      If the Q BIT Include socket option is in force, the first
1070          *      byte of the user data is the logical value of the Q Bit.
1071          */
1072         if (x25->qbitincl) {
1073                 qbit = skb->data[0];
1074                 skb_pull(skb, 1);
1075         }
1076
1077         /*
1078          *      Push down the X.25 header
1079          */
1080         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1081
1082         if (msg->msg_flags & MSG_OOB) {
1083                 if (x25->neighbour->extended) {
1084                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1085                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1086                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1087                         *asmptr++ = X25_INTERRUPT;
1088                 } else {
1089                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1090                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1091                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1092                         *asmptr++ = X25_INTERRUPT;
1093                 }
1094         } else {
1095                 if (x25->neighbour->extended) {
1096                         /* Build an Extended X.25 header */
1097                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1098                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1099                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1100                         *asmptr++ = X25_DATA;
1101                         *asmptr++ = X25_DATA;
1102                 } else {
1103                         /* Build an Standard X.25 header */
1104                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1105                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1106                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1107                         *asmptr++ = X25_DATA;
1108                 }
1109
1110                 if (qbit)
1111                         skb->data[0] |= X25_Q_BIT;
1112         }
1113
1114         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1115         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1116
1117         rc = -ENOTCONN;
1118         if (sk->sk_state != TCP_ESTABLISHED)
1119                 goto out_kfree_skb;
1120
1121         if (msg->msg_flags & MSG_OOB)
1122                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1123         else {
1124                 len = x25_output(sk, skb);
1125                 if (len < 0)
1126                         kfree_skb(skb);
1127                 else if (x25->qbitincl)
1128                         len++;
1129         }
1130
1131         /*
1132          * lock_sock() is currently only used to serialize this x25_kick()
1133          * against input-driven x25_kick() calls. It currently only blocks
1134          * incoming packets for this socket and does not protect against
1135          * any other socket state changes and is not called from anywhere
1136          * else. As x25_kick() cannot block and as long as all socket
1137          * operations are BKL-wrapped, we don't need take to care about
1138          * purging the backlog queue in x25_release().
1139          *
1140          * Using lock_sock() to protect all socket operations entirely
1141          * (and making the whole x25 stack SMP aware) unfortunately would
1142          * require major changes to {send,recv}msg and skb allocation methods.
1143          * -> 2.5 ;)
1144          */
1145         lock_sock(sk);
1146         x25_kick(sk);
1147         release_sock(sk);
1148         rc = len;
1149 out:
1150         return rc;
1151 out_kfree_skb:
1152         kfree_skb(skb);
1153         goto out;
1154 }
1155
1156
1157 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1158                        struct msghdr *msg, size_t size,
1159                        int flags)
1160 {
1161         struct sock *sk = sock->sk;
1162         struct x25_sock *x25 = x25_sk(sk);
1163         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1164         size_t copied;
1165         int qbit;
1166         struct sk_buff *skb;
1167         unsigned char *asmptr;
1168         int rc = -ENOTCONN;
1169
1170         /*
1171          * This works for seqpacket too. The receiver has ordered the queue for
1172          * us! We do one quick check first though
1173          */
1174         if (sk->sk_state != TCP_ESTABLISHED)
1175                 goto out;
1176
1177         if (flags & MSG_OOB) {
1178                 rc = -EINVAL;
1179                 if (sock_flag(sk, SOCK_URGINLINE) ||
1180                     !skb_peek(&x25->interrupt_in_queue))
1181                         goto out;
1182
1183                 skb = skb_dequeue(&x25->interrupt_in_queue);
1184
1185                 skb_pull(skb, X25_STD_MIN_LEN);
1186
1187                 /*
1188                  *      No Q bit information on Interrupt data.
1189                  */
1190                 if (x25->qbitincl) {
1191                         asmptr  = skb_push(skb, 1);
1192                         *asmptr = 0x00;
1193                 }
1194
1195                 msg->msg_flags |= MSG_OOB;
1196         } else {
1197                 /* Now we can treat all alike */
1198                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1199                                         flags & MSG_DONTWAIT, &rc);
1200                 if (!skb)
1201                         goto out;
1202
1203                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1204
1205                 skb_pull(skb, x25->neighbour->extended ?
1206                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1207
1208                 if (x25->qbitincl) {
1209                         asmptr  = skb_push(skb, 1);
1210                         *asmptr = qbit;
1211                 }
1212         }
1213
1214         skb_reset_transport_header(skb);
1215         copied = skb->len;
1216
1217         if (copied > size) {
1218                 copied = size;
1219                 msg->msg_flags |= MSG_TRUNC;
1220         }
1221
1222         /* Currently, each datagram always contains a complete record */
1223         msg->msg_flags |= MSG_EOR;
1224
1225         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1226         if (rc)
1227                 goto out_free_dgram;
1228
1229         if (sx25) {
1230                 sx25->sx25_family = AF_X25;
1231                 sx25->sx25_addr   = x25->dest_addr;
1232         }
1233
1234         msg->msg_namelen = sizeof(struct sockaddr_x25);
1235
1236         lock_sock(sk);
1237         x25_check_rbuf(sk);
1238         release_sock(sk);
1239         rc = copied;
1240 out_free_dgram:
1241         skb_free_datagram(sk, skb);
1242 out:
1243         return rc;
1244 }
1245
1246
1247 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1248 {
1249         struct sock *sk = sock->sk;
1250         struct x25_sock *x25 = x25_sk(sk);
1251         void __user *argp = (void __user *)arg;
1252         int rc;
1253
1254         switch (cmd) {
1255                 case TIOCOUTQ: {
1256                         int amount = sk->sk_sndbuf -
1257                                      atomic_read(&sk->sk_wmem_alloc);
1258                         if (amount < 0)
1259                                 amount = 0;
1260                         rc = put_user(amount, (unsigned int __user *)argp);
1261                         break;
1262                 }
1263
1264                 case TIOCINQ: {
1265                         struct sk_buff *skb;
1266                         int amount = 0;
1267                         /*
1268                          * These two are safe on a single CPU system as
1269                          * only user tasks fiddle here
1270                          */
1271                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1272                                 amount = skb->len;
1273                         rc = put_user(amount, (unsigned int __user *)argp);
1274                         break;
1275                 }
1276
1277                 case SIOCGSTAMP:
1278                         rc = -EINVAL;
1279                         if (sk)
1280                                 rc = sock_get_timestamp(sk,
1281                                                 (struct timeval __user *)argp);
1282                         break;
1283                 case SIOCGSTAMPNS:
1284                         rc = -EINVAL;
1285                         if (sk)
1286                                 rc = sock_get_timestampns(sk,
1287                                                 (struct timespec __user *)argp);
1288                         break;
1289                 case SIOCGIFADDR:
1290                 case SIOCSIFADDR:
1291                 case SIOCGIFDSTADDR:
1292                 case SIOCSIFDSTADDR:
1293                 case SIOCGIFBRDADDR:
1294                 case SIOCSIFBRDADDR:
1295                 case SIOCGIFNETMASK:
1296                 case SIOCSIFNETMASK:
1297                 case SIOCGIFMETRIC:
1298                 case SIOCSIFMETRIC:
1299                         rc = -EINVAL;
1300                         break;
1301                 case SIOCADDRT:
1302                 case SIOCDELRT:
1303                         rc = -EPERM;
1304                         if (!capable(CAP_NET_ADMIN))
1305                                 break;
1306                         rc = x25_route_ioctl(cmd, argp);
1307                         break;
1308                 case SIOCX25GSUBSCRIP:
1309                         rc = x25_subscr_ioctl(cmd, argp);
1310                         break;
1311                 case SIOCX25SSUBSCRIP:
1312                         rc = -EPERM;
1313                         if (!capable(CAP_NET_ADMIN))
1314                                 break;
1315                         rc = x25_subscr_ioctl(cmd, argp);
1316                         break;
1317                 case SIOCX25GFACILITIES: {
1318                         struct x25_facilities fac = x25->facilities;
1319                         rc = copy_to_user(argp, &fac,
1320                                           sizeof(fac)) ? -EFAULT : 0;
1321                         break;
1322                 }
1323
1324                 case SIOCX25SFACILITIES: {
1325                         struct x25_facilities facilities;
1326                         rc = -EFAULT;
1327                         if (copy_from_user(&facilities, argp,
1328                                            sizeof(facilities)))
1329                                 break;
1330                         rc = -EINVAL;
1331                         if (sk->sk_state != TCP_LISTEN &&
1332                             sk->sk_state != TCP_CLOSE)
1333                                 break;
1334                         if (facilities.pacsize_in < X25_PS16 ||
1335                             facilities.pacsize_in > X25_PS4096)
1336                                 break;
1337                         if (facilities.pacsize_out < X25_PS16 ||
1338                             facilities.pacsize_out > X25_PS4096)
1339                                 break;
1340                         if (facilities.winsize_in < 1 ||
1341                             facilities.winsize_in > 127)
1342                                 break;
1343                         if (facilities.throughput < 0x03 ||
1344                             facilities.throughput > 0xDD)
1345                                 break;
1346                         if (facilities.reverse &&
1347                                 (facilities.reverse | 0x81)!= 0x81)
1348                                 break;
1349                         x25->facilities = facilities;
1350                         rc = 0;
1351                         break;
1352                 }
1353
1354                 case SIOCX25GDTEFACILITIES: {
1355                         rc = copy_to_user(argp, &x25->dte_facilities,
1356                                                 sizeof(x25->dte_facilities));
1357                         if (rc)
1358                                 rc = -EFAULT;
1359                         break;
1360                 }
1361
1362                 case SIOCX25SDTEFACILITIES: {
1363                         struct x25_dte_facilities dtefacs;
1364                         rc = -EFAULT;
1365                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1366                                 break;
1367                         rc = -EINVAL;
1368                         if (sk->sk_state != TCP_LISTEN &&
1369                                         sk->sk_state != TCP_CLOSE)
1370                                 break;
1371                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1372                                 break;
1373                         if (dtefacs.calling_ae == NULL)
1374                                 break;
1375                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1376                                 break;
1377                         if (dtefacs.called_ae == NULL)
1378                                 break;
1379                         x25->dte_facilities = dtefacs;
1380                         rc = 0;
1381                         break;
1382                 }
1383
1384                 case SIOCX25GCALLUSERDATA: {
1385                         struct x25_calluserdata cud = x25->calluserdata;
1386                         rc = copy_to_user(argp, &cud,
1387                                           sizeof(cud)) ? -EFAULT : 0;
1388                         break;
1389                 }
1390
1391                 case SIOCX25SCALLUSERDATA: {
1392                         struct x25_calluserdata calluserdata;
1393
1394                         rc = -EFAULT;
1395                         if (copy_from_user(&calluserdata, argp,
1396                                            sizeof(calluserdata)))
1397                                 break;
1398                         rc = -EINVAL;
1399                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1400                                 break;
1401                         x25->calluserdata = calluserdata;
1402                         rc = 0;
1403                         break;
1404                 }
1405
1406                 case SIOCX25GCAUSEDIAG: {
1407                         struct x25_causediag causediag;
1408                         causediag = x25->causediag;
1409                         rc = copy_to_user(argp, &causediag,
1410                                           sizeof(causediag)) ? -EFAULT : 0;
1411                         break;
1412                 }
1413
1414                 case SIOCX25SCUDMATCHLEN: {
1415                         struct x25_subaddr sub_addr;
1416                         rc = -EINVAL;
1417                         if(sk->sk_state != TCP_CLOSE)
1418                                 break;
1419                         rc = -EFAULT;
1420                         if (copy_from_user(&sub_addr, argp,
1421                                         sizeof(sub_addr)))
1422                                 break;
1423                         rc = -EINVAL;
1424                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1425                                 break;
1426                         x25->cudmatchlength = sub_addr.cudmatchlength;
1427                         rc = 0;
1428                         break;
1429                 }
1430
1431                 case SIOCX25CALLACCPTAPPRV: {
1432                         rc = -EINVAL;
1433                         if (sk->sk_state != TCP_CLOSE)
1434                                 break;
1435                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1436                         rc = 0;
1437                         break;
1438                 }
1439
1440                 case SIOCX25SENDCALLACCPT:  {
1441                         rc = -EINVAL;
1442                         if (sk->sk_state != TCP_ESTABLISHED)
1443                                 break;
1444                         if (x25->accptapprv)    /* must call accptapprv above */
1445                                 break;
1446                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1447                         x25->state = X25_STATE_3;
1448                         rc = 0;
1449                         break;
1450                 }
1451
1452                 default:
1453                         rc = -ENOIOCTLCMD;
1454                         break;
1455         }
1456
1457         return rc;
1458 }
1459
1460 static struct net_proto_family x25_family_ops = {
1461         .family =       AF_X25,
1462         .create =       x25_create,
1463         .owner  =       THIS_MODULE,
1464 };
1465
1466 #ifdef CONFIG_COMPAT
1467 static int compat_x25_subscr_ioctl(unsigned int cmd,
1468                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1469 {
1470         struct compat_x25_subscrip_struct x25_subscr;
1471         struct x25_neigh *nb;
1472         struct net_device *dev;
1473         int rc = -EINVAL;
1474
1475         rc = -EFAULT;
1476         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1477                 goto out;
1478
1479         rc = -EINVAL;
1480         dev = x25_dev_get(x25_subscr.device);
1481         if (dev == NULL)
1482                 goto out;
1483
1484         nb = x25_get_neigh(dev);
1485         if (nb == NULL)
1486                 goto out_dev_put;
1487
1488         dev_put(dev);
1489
1490         if (cmd == SIOCX25GSUBSCRIP) {
1491                 x25_subscr.extended = nb->extended;
1492                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1493                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1494                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1495         } else {
1496                 rc = -EINVAL;
1497                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1498                         rc = 0;
1499                         nb->extended = x25_subscr.extended;
1500                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1501                 }
1502         }
1503         x25_neigh_put(nb);
1504 out:
1505         return rc;
1506 out_dev_put:
1507         dev_put(dev);
1508         goto out;
1509 }
1510
1511 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1512                                 unsigned long arg)
1513 {
1514         void __user *argp = compat_ptr(arg);
1515         struct sock *sk = sock->sk;
1516
1517         int rc = -ENOIOCTLCMD;
1518
1519         switch(cmd) {
1520         case TIOCOUTQ:
1521         case TIOCINQ:
1522                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1523                 break;
1524         case SIOCGSTAMP:
1525                 rc = -EINVAL;
1526                 if (sk)
1527                         rc = compat_sock_get_timestamp(sk,
1528                                         (struct timeval __user*)argp);
1529                 break;
1530         case SIOCGSTAMPNS:
1531                 rc = -EINVAL;
1532                 if (sk)
1533                         rc = compat_sock_get_timestampns(sk,
1534                                         (struct timespec __user*)argp);
1535                 break;
1536         case SIOCGIFADDR:
1537         case SIOCSIFADDR:
1538         case SIOCGIFDSTADDR:
1539         case SIOCSIFDSTADDR:
1540         case SIOCGIFBRDADDR:
1541         case SIOCSIFBRDADDR:
1542         case SIOCGIFNETMASK:
1543         case SIOCSIFNETMASK:
1544         case SIOCGIFMETRIC:
1545         case SIOCSIFMETRIC:
1546                 rc = -EINVAL;
1547                 break;
1548         case SIOCADDRT:
1549         case SIOCDELRT:
1550                 rc = -EPERM;
1551                 if (!capable(CAP_NET_ADMIN))
1552                         break;
1553                 rc = x25_route_ioctl(cmd, argp);
1554                 break;
1555         case SIOCX25GSUBSCRIP:
1556                 rc = compat_x25_subscr_ioctl(cmd, argp);
1557                 break;
1558         case SIOCX25SSUBSCRIP:
1559                 rc = -EPERM;
1560                 if (!capable(CAP_NET_ADMIN))
1561                         break;
1562                 rc = compat_x25_subscr_ioctl(cmd, argp);
1563                 break;
1564         case SIOCX25GFACILITIES:
1565         case SIOCX25SFACILITIES:
1566         case SIOCX25GDTEFACILITIES:
1567         case SIOCX25SDTEFACILITIES:
1568         case SIOCX25GCALLUSERDATA:
1569         case SIOCX25SCALLUSERDATA:
1570         case SIOCX25GCAUSEDIAG:
1571         case SIOCX25SCUDMATCHLEN:
1572         case SIOCX25CALLACCPTAPPRV:
1573         case SIOCX25SENDCALLACCPT:
1574                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1575                 break;
1576         default:
1577                 rc = -ENOIOCTLCMD;
1578                 break;
1579         }
1580         return rc;
1581 }
1582 #endif
1583
1584 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1585         .family =       AF_X25,
1586         .owner =        THIS_MODULE,
1587         .release =      x25_release,
1588         .bind =         x25_bind,
1589         .connect =      x25_connect,
1590         .socketpair =   sock_no_socketpair,
1591         .accept =       x25_accept,
1592         .getname =      x25_getname,
1593         .poll =         datagram_poll,
1594         .ioctl =        x25_ioctl,
1595 #ifdef CONFIG_COMPAT
1596         .compat_ioctl = compat_x25_ioctl,
1597 #endif
1598         .listen =       x25_listen,
1599         .shutdown =     sock_no_shutdown,
1600         .setsockopt =   x25_setsockopt,
1601         .getsockopt =   x25_getsockopt,
1602         .sendmsg =      x25_sendmsg,
1603         .recvmsg =      x25_recvmsg,
1604         .mmap =         sock_no_mmap,
1605         .sendpage =     sock_no_sendpage,
1606 };
1607
1608 SOCKOPS_WRAP(x25_proto, AF_X25);
1609
1610 static struct packet_type x25_packet_type = {
1611         .type = __constant_htons(ETH_P_X25),
1612         .func = x25_lapb_receive_frame,
1613 };
1614
1615 static struct notifier_block x25_dev_notifier = {
1616         .notifier_call = x25_device_event,
1617 };
1618
1619 void x25_kill_by_neigh(struct x25_neigh *nb)
1620 {
1621         struct sock *s;
1622         struct hlist_node *node;
1623
1624         write_lock_bh(&x25_list_lock);
1625
1626         sk_for_each(s, node, &x25_list)
1627                 if (x25_sk(s)->neighbour == nb)
1628                         x25_disconnect(s, ENETUNREACH, 0, 0);
1629
1630         write_unlock_bh(&x25_list_lock);
1631
1632         /* Remove any related forwards */
1633         x25_clear_forward_by_dev(nb->dev);
1634 }
1635
1636 static int __init x25_init(void)
1637 {
1638         int rc = proto_register(&x25_proto, 0);
1639
1640         if (rc != 0)
1641                 goto out;
1642
1643         sock_register(&x25_family_ops);
1644
1645         dev_add_pack(&x25_packet_type);
1646
1647         register_netdevice_notifier(&x25_dev_notifier);
1648
1649         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1650
1651 #ifdef CONFIG_SYSCTL
1652         x25_register_sysctl();
1653 #endif
1654         x25_proc_init();
1655 out:
1656         return rc;
1657 }
1658 module_init(x25_init);
1659
1660 static void __exit x25_exit(void)
1661 {
1662         x25_proc_exit();
1663         x25_link_free();
1664         x25_route_free();
1665
1666 #ifdef CONFIG_SYSCTL
1667         x25_unregister_sysctl();
1668 #endif
1669
1670         unregister_netdevice_notifier(&x25_dev_notifier);
1671
1672         dev_remove_pack(&x25_packet_type);
1673
1674         sock_unregister(AF_X25);
1675         proto_unregister(&x25_proto);
1676 }
1677 module_exit(x25_exit);
1678
1679 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1680 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1681 MODULE_LICENSE("GPL");
1682 MODULE_ALIAS_NETPROTO(PF_X25);