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af_x25.c
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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 <linux/slab.h>
50 #include <net/sock.h>
51 #include <net/tcp_states.h>
52 #include <asm/uaccess.h>
53 #include <linux/fcntl.h>
54 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
55 #include <linux/notifier.h>
56 #include <linux/init.h>
57 #include <linux/compat.h>
58 #include <linux/ctype.h>
59 
60 #include <net/x25.h>
61 #include <net/compat.h>
62 
69 
70 HLIST_HEAD(x25_list);
71 DEFINE_RWLOCK(x25_list_lock);
72 
73 static const struct proto_ops x25_proto_ops;
74 
75 static struct x25_address null_x25_address = {" "};
76 
77 #ifdef CONFIG_COMPAT
78 struct compat_x25_subscrip_struct {
79  char device[200-sizeof(compat_ulong_t)];
80  compat_ulong_t global_facil_mask;
81  compat_uint_t extended;
82 };
83 #endif
84 
85 
87  struct x25_address *called_addr,
88  struct x25_address *calling_addr)
89 {
90  unsigned char len;
91  int needed;
92  int rc;
93 
94  if (!pskb_may_pull(skb, 1)) {
95  /* packet has no address block */
96  rc = 0;
97  goto empty;
98  }
99 
100  len = *skb->data;
101  needed = 1 + (len >> 4) + (len & 0x0f);
102 
103  if (!pskb_may_pull(skb, needed)) {
104  /* packet is too short to hold the addresses it claims
105  to hold */
106  rc = -1;
107  goto empty;
108  }
109 
110  return x25_addr_ntoa(skb->data, called_addr, calling_addr);
111 
112 empty:
113  *called_addr->x25_addr = 0;
114  *calling_addr->x25_addr = 0;
115 
116  return rc;
117 }
118 
119 
120 int x25_addr_ntoa(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  unsigned int i;
126 
127  called_len = (*p >> 0) & 0x0F;
128  calling_len = (*p >> 4) & 0x0F;
129 
130  called = called_addr->x25_addr;
131  calling = calling_addr->x25_addr;
132  p++;
133 
134  for (i = 0; i < (called_len + calling_len); i++) {
135  if (i < called_len) {
136  if (i % 2 != 0) {
137  *called++ = ((*p >> 0) & 0x0F) + '0';
138  p++;
139  } else {
140  *called++ = ((*p >> 4) & 0x0F) + '0';
141  }
142  } else {
143  if (i % 2 != 0) {
144  *calling++ = ((*p >> 0) & 0x0F) + '0';
145  p++;
146  } else {
147  *calling++ = ((*p >> 4) & 0x0F) + '0';
148  }
149  }
150  }
151 
152  *called = *calling = '\0';
153 
154  return 1 + (called_len + calling_len + 1) / 2;
155 }
156 
157 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
158  struct x25_address *calling_addr)
159 {
160  unsigned int called_len, calling_len;
161  char *called, *calling;
162  int i;
163 
164  called = called_addr->x25_addr;
165  calling = calling_addr->x25_addr;
166 
167  called_len = strlen(called);
168  calling_len = strlen(calling);
169 
170  *p++ = (calling_len << 4) | (called_len << 0);
171 
172  for (i = 0; i < (called_len + calling_len); i++) {
173  if (i < called_len) {
174  if (i % 2 != 0) {
175  *p |= (*called++ - '0') << 0;
176  p++;
177  } else {
178  *p = 0x00;
179  *p |= (*called++ - '0') << 4;
180  }
181  } else {
182  if (i % 2 != 0) {
183  *p |= (*calling++ - '0') << 0;
184  p++;
185  } else {
186  *p = 0x00;
187  *p |= (*calling++ - '0') << 4;
188  }
189  }
190  }
191 
192  return 1 + (called_len + calling_len + 1) / 2;
193 }
194 
195 /*
196  * Socket removal during an interrupt is now safe.
197  */
198 static void x25_remove_socket(struct sock *sk)
199 {
200  write_lock_bh(&x25_list_lock);
201  sk_del_node_init(sk);
202  write_unlock_bh(&x25_list_lock);
203 }
204 
205 /*
206  * Kill all bound sockets on a dropped device.
207  */
208 static void x25_kill_by_device(struct net_device *dev)
209 {
210  struct sock *s;
211  struct hlist_node *node;
212 
213  write_lock_bh(&x25_list_lock);
214 
215  sk_for_each(s, node, &x25_list)
216  if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
217  x25_disconnect(s, ENETUNREACH, 0, 0);
218 
219  write_unlock_bh(&x25_list_lock);
220 }
221 
222 /*
223  * Handle device status changes.
224  */
225 static int x25_device_event(struct notifier_block *this, unsigned long event,
226  void *ptr)
227 {
228  struct net_device *dev = ptr;
229  struct x25_neigh *nb;
230 
231  if (!net_eq(dev_net(dev), &init_net))
232  return NOTIFY_DONE;
233 
234  if (dev->type == ARPHRD_X25
235 #if IS_ENABLED(CONFIG_LLC)
236  || dev->type == ARPHRD_ETHER
237 #endif
238  ) {
239  switch (event) {
240  case NETDEV_UP:
241  x25_link_device_up(dev);
242  break;
243  case NETDEV_GOING_DOWN:
244  nb = x25_get_neigh(dev);
245  if (nb) {
246  x25_terminate_link(nb);
247  x25_neigh_put(nb);
248  }
249  break;
250  case NETDEV_DOWN:
251  x25_kill_by_device(dev);
254  break;
255  }
256  }
257 
258  return NOTIFY_DONE;
259 }
260 
261 /*
262  * Add a socket to the bound sockets list.
263  */
264 static void x25_insert_socket(struct sock *sk)
265 {
266  write_lock_bh(&x25_list_lock);
267  sk_add_node(sk, &x25_list);
268  write_unlock_bh(&x25_list_lock);
269 }
270 
271 /*
272  * Find a socket that wants to accept the Call Request we just
273  * received. Check the full list for an address/cud match.
274  * If no cuds match return the next_best thing, an address match.
275  * Note: if a listening socket has cud set it must only get calls
276  * with matching cud.
277  */
278 static struct sock *x25_find_listener(struct x25_address *addr,
279  struct sk_buff *skb)
280 {
281  struct sock *s;
282  struct sock *next_best;
283  struct hlist_node *node;
284 
285  read_lock_bh(&x25_list_lock);
286  next_best = NULL;
287 
288  sk_for_each(s, node, &x25_list)
289  if ((!strcmp(addr->x25_addr,
290  x25_sk(s)->source_addr.x25_addr) ||
291  !strcmp(addr->x25_addr,
292  null_x25_address.x25_addr)) &&
293  s->sk_state == TCP_LISTEN) {
294  /*
295  * Found a listening socket, now check the incoming
296  * call user data vs this sockets call user data
297  */
298  if (x25_sk(s)->cudmatchlength > 0 &&
299  skb->len >= x25_sk(s)->cudmatchlength) {
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 
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 /*
436  * Handling for system calls applied via the various interfaces to a
437  * X.25 socket object.
438  */
439 
440 static int x25_setsockopt(struct socket *sock, int level, int optname,
441  char __user *optval, unsigned int optlen)
442 {
443  int opt;
444  struct sock *sk = sock->sk;
445  int rc = -ENOPROTOOPT;
446 
447  if (level != SOL_X25 || optname != X25_QBITINCL)
448  goto out;
449 
450  rc = -EINVAL;
451  if (optlen < sizeof(int))
452  goto out;
453 
454  rc = -EFAULT;
455  if (get_user(opt, (int __user *)optval))
456  goto out;
457 
458  if (opt)
459  set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460  else
461  clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
462  rc = 0;
463 out:
464  return rc;
465 }
466 
467 static int x25_getsockopt(struct socket *sock, int level, int optname,
468  char __user *optval, int __user *optlen)
469 {
470  struct sock *sk = sock->sk;
471  int val, len, rc = -ENOPROTOOPT;
472 
473  if (level != SOL_X25 || optname != X25_QBITINCL)
474  goto out;
475 
476  rc = -EFAULT;
477  if (get_user(len, optlen))
478  goto out;
479 
480  len = min_t(unsigned int, len, sizeof(int));
481 
482  rc = -EINVAL;
483  if (len < 0)
484  goto out;
485 
486  rc = -EFAULT;
487  if (put_user(len, optlen))
488  goto out;
489 
490  val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
491  rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
492 out:
493  return rc;
494 }
495 
496 static int x25_listen(struct socket *sock, int backlog)
497 {
498  struct sock *sk = sock->sk;
499  int rc = -EOPNOTSUPP;
500 
501  lock_sock(sk);
502  if (sk->sk_state != TCP_LISTEN) {
503  memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
505  sk->sk_state = TCP_LISTEN;
506  rc = 0;
507  }
508  release_sock(sk);
509 
510  return rc;
511 }
512 
513 static struct proto x25_proto = {
514  .name = "X25",
515  .owner = THIS_MODULE,
516  .obj_size = sizeof(struct x25_sock),
517 };
518 
519 static struct sock *x25_alloc_socket(struct net *net)
520 {
521  struct x25_sock *x25;
522  struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
523 
524  if (!sk)
525  goto out;
526 
527  sock_init_data(NULL, sk);
528 
529  x25 = x25_sk(sk);
530  skb_queue_head_init(&x25->ack_queue);
531  skb_queue_head_init(&x25->fragment_queue);
532  skb_queue_head_init(&x25->interrupt_in_queue);
533  skb_queue_head_init(&x25->interrupt_out_queue);
534 out:
535  return sk;
536 }
537 
538 static int x25_create(struct net *net, struct socket *sock, int protocol,
539  int kern)
540 {
541  struct sock *sk;
542  struct x25_sock *x25;
543  int rc = -EAFNOSUPPORT;
544 
545  if (!net_eq(net, &init_net))
546  goto out;
547 
548  rc = -ESOCKTNOSUPPORT;
549  if (sock->type != SOCK_SEQPACKET)
550  goto out;
551 
552  rc = -EINVAL;
553  if (protocol)
554  goto out;
555 
556  rc = -ENOBUFS;
557  if ((sk = x25_alloc_socket(net)) == NULL)
558  goto out;
559 
560  x25 = x25_sk(sk);
561 
562  sock_init_data(sock, sk);
563 
564  x25_init_timers(sk);
565 
566  sock->ops = &x25_proto_ops;
567  sk->sk_protocol = protocol;
569 
574  x25->state = X25_STATE_0;
575  x25->cudmatchlength = 0;
576  set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
577  /* on call accept */
578 
579  x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
580  x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
581  x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
582  x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
583  x25->facilities.throughput = 0; /* by default don't negotiate
584  throughput */
585  x25->facilities.reverse = X25_DEFAULT_REVERSE;
586  x25->dte_facilities.calling_len = 0;
587  x25->dte_facilities.called_len = 0;
588  memset(x25->dte_facilities.called_ae, '\0',
589  sizeof(x25->dte_facilities.called_ae));
590  memset(x25->dte_facilities.calling_ae, '\0',
591  sizeof(x25->dte_facilities.calling_ae));
592 
593  rc = 0;
594 out:
595  return rc;
596 }
597 
598 static struct sock *x25_make_new(struct sock *osk)
599 {
600  struct sock *sk = NULL;
601  struct x25_sock *x25, *ox25;
602 
603  if (osk->sk_type != SOCK_SEQPACKET)
604  goto out;
605 
606  if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
607  goto out;
608 
609  x25 = x25_sk(sk);
610 
611  sk->sk_type = osk->sk_type;
612  sk->sk_priority = osk->sk_priority;
613  sk->sk_protocol = osk->sk_protocol;
614  sk->sk_rcvbuf = osk->sk_rcvbuf;
615  sk->sk_sndbuf = osk->sk_sndbuf;
616  sk->sk_state = TCP_ESTABLISHED;
617  sk->sk_backlog_rcv = osk->sk_backlog_rcv;
618  sock_copy_flags(sk, osk);
619 
620  ox25 = x25_sk(osk);
621  x25->t21 = ox25->t21;
622  x25->t22 = ox25->t22;
623  x25->t23 = ox25->t23;
624  x25->t2 = ox25->t2;
625  x25->flags = ox25->flags;
626  x25->facilities = ox25->facilities;
627  x25->dte_facilities = ox25->dte_facilities;
628  x25->cudmatchlength = ox25->cudmatchlength;
629 
631  x25_init_timers(sk);
632 out:
633  return sk;
634 }
635 
636 static int x25_release(struct socket *sock)
637 {
638  struct sock *sk = sock->sk;
639  struct x25_sock *x25;
640 
641  if (!sk)
642  return 0;
643 
644  x25 = x25_sk(sk);
645 
646  sock_hold(sk);
647  lock_sock(sk);
648  switch (x25->state) {
649 
650  case X25_STATE_0:
651  case X25_STATE_2:
652  x25_disconnect(sk, 0, 0, 0);
653  __x25_destroy_socket(sk);
654  goto out;
655 
656  case X25_STATE_1:
657  case X25_STATE_3:
658  case X25_STATE_4:
659  x25_clear_queues(sk);
661  x25_start_t23timer(sk);
662  x25->state = X25_STATE_2;
663  sk->sk_state = TCP_CLOSE;
664  sk->sk_shutdown |= SEND_SHUTDOWN;
665  sk->sk_state_change(sk);
666  sock_set_flag(sk, SOCK_DEAD);
667  sock_set_flag(sk, SOCK_DESTROY);
668  break;
669  }
670 
671  sock_orphan(sk);
672 out:
673  release_sock(sk);
674  sock_put(sk);
675  return 0;
676 }
677 
678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
679 {
680  struct sock *sk = sock->sk;
681  struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
682  int len, i, rc = 0;
683 
684  if (!sock_flag(sk, SOCK_ZAPPED) ||
685  addr_len != sizeof(struct sockaddr_x25) ||
686  addr->sx25_family != AF_X25) {
687  rc = -EINVAL;
688  goto out;
689  }
690 
691  len = strlen(addr->sx25_addr.x25_addr);
692  for (i = 0; i < len; i++) {
693  if (!isdigit(addr->sx25_addr.x25_addr[i])) {
694  rc = -EINVAL;
695  goto out;
696  }
697  }
698 
699  lock_sock(sk);
700  x25_sk(sk)->source_addr = addr->sx25_addr;
701  x25_insert_socket(sk);
702  sock_reset_flag(sk, SOCK_ZAPPED);
703  release_sock(sk);
704  SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
705 out:
706  return rc;
707 }
708 
709 static int x25_wait_for_connection_establishment(struct sock *sk)
710 {
712  int rc;
713 
714  add_wait_queue_exclusive(sk_sleep(sk), &wait);
715  for (;;) {
717  rc = -ERESTARTSYS;
718  if (signal_pending(current))
719  break;
720  rc = sock_error(sk);
721  if (rc) {
722  sk->sk_socket->state = SS_UNCONNECTED;
723  break;
724  }
725  rc = 0;
726  if (sk->sk_state != TCP_ESTABLISHED) {
727  release_sock(sk);
728  schedule();
729  lock_sock(sk);
730  } else
731  break;
732  }
734  remove_wait_queue(sk_sleep(sk), &wait);
735  return rc;
736 }
737 
738 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739  int addr_len, int flags)
740 {
741  struct sock *sk = sock->sk;
742  struct x25_sock *x25 = x25_sk(sk);
743  struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744  struct x25_route *rt;
745  int rc = 0;
746 
747  lock_sock(sk);
748  if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749  sock->state = SS_CONNECTED;
750  goto out; /* Connect completed during a ERESTARTSYS event */
751  }
752 
753  rc = -ECONNREFUSED;
754  if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755  sock->state = SS_UNCONNECTED;
756  goto out;
757  }
758 
759  rc = -EISCONN; /* No reconnect on a seqpacket socket */
760  if (sk->sk_state == TCP_ESTABLISHED)
761  goto out;
762 
763  sk->sk_state = TCP_CLOSE;
764  sock->state = SS_UNCONNECTED;
765 
766  rc = -EINVAL;
767  if (addr_len != sizeof(struct sockaddr_x25) ||
768  addr->sx25_family != AF_X25)
769  goto out;
770 
771  rc = -ENETUNREACH;
772  rt = x25_get_route(&addr->sx25_addr);
773  if (!rt)
774  goto out;
775 
776  x25->neighbour = x25_get_neigh(rt->dev);
777  if (!x25->neighbour)
778  goto out_put_route;
779 
781 
782  x25->lci = x25_new_lci(x25->neighbour);
783  if (!x25->lci)
784  goto out_put_neigh;
785 
786  rc = -EINVAL;
787  if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
788  goto out_put_neigh;
789 
790  if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
791  memset(&x25->source_addr, '\0', X25_ADDR_LEN);
792 
793  x25->dest_addr = addr->sx25_addr;
794 
795  /* Move to connecting socket, start sending Connect Requests */
796  sock->state = SS_CONNECTING;
797  sk->sk_state = TCP_SYN_SENT;
798 
799  x25->state = X25_STATE_1;
800 
802 
804  x25_start_t21timer(sk);
805 
806  /* Now the loop */
807  rc = -EINPROGRESS;
808  if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
809  goto out_put_neigh;
810 
811  rc = x25_wait_for_connection_establishment(sk);
812  if (rc)
813  goto out_put_neigh;
814 
815  sock->state = SS_CONNECTED;
816  rc = 0;
817 out_put_neigh:
818  if (rc)
819  x25_neigh_put(x25->neighbour);
820 out_put_route:
821  x25_route_put(rt);
822 out:
823  release_sock(sk);
824  return rc;
825 }
826 
827 static int x25_wait_for_data(struct sock *sk, long timeout)
828 {
830  int rc = 0;
831 
832  add_wait_queue_exclusive(sk_sleep(sk), &wait);
833  for (;;) {
835  if (sk->sk_shutdown & RCV_SHUTDOWN)
836  break;
837  rc = -ERESTARTSYS;
838  if (signal_pending(current))
839  break;
840  rc = -EAGAIN;
841  if (!timeout)
842  break;
843  rc = 0;
844  if (skb_queue_empty(&sk->sk_receive_queue)) {
845  release_sock(sk);
846  timeout = schedule_timeout(timeout);
847  lock_sock(sk);
848  } else
849  break;
850  }
852  remove_wait_queue(sk_sleep(sk), &wait);
853  return rc;
854 }
855 
856 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
857 {
858  struct sock *sk = sock->sk;
859  struct sock *newsk;
860  struct sk_buff *skb;
861  int rc = -EINVAL;
862 
863  if (!sk)
864  goto out;
865 
866  rc = -EOPNOTSUPP;
867  if (sk->sk_type != SOCK_SEQPACKET)
868  goto out;
869 
870  lock_sock(sk);
871  rc = -EINVAL;
872  if (sk->sk_state != TCP_LISTEN)
873  goto out2;
874 
875  rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
876  if (rc)
877  goto out2;
878  skb = skb_dequeue(&sk->sk_receive_queue);
879  rc = -EINVAL;
880  if (!skb->sk)
881  goto out2;
882  newsk = skb->sk;
883  sock_graft(newsk, newsock);
884 
885  /* Now attach up the new socket */
886  skb->sk = NULL;
887  kfree_skb(skb);
888  sk->sk_ack_backlog--;
889  newsock->state = SS_CONNECTED;
890  rc = 0;
891 out2:
892  release_sock(sk);
893 out:
894  return rc;
895 }
896 
897 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
898  int *uaddr_len, int peer)
899 {
900  struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
901  struct sock *sk = sock->sk;
902  struct x25_sock *x25 = x25_sk(sk);
903  int rc = 0;
904 
905  if (peer) {
906  if (sk->sk_state != TCP_ESTABLISHED) {
907  rc = -ENOTCONN;
908  goto out;
909  }
910  sx25->sx25_addr = x25->dest_addr;
911  } else
912  sx25->sx25_addr = x25->source_addr;
913 
914  sx25->sx25_family = AF_X25;
915  *uaddr_len = sizeof(*sx25);
916 
917 out:
918  return rc;
919 }
920 
921 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
922  unsigned int lci)
923 {
924  struct sock *sk;
925  struct sock *make;
926  struct x25_sock *makex25;
927  struct x25_address source_addr, dest_addr;
928  struct x25_facilities facilities;
929  struct x25_dte_facilities dte_facilities;
930  int len, addr_len, rc;
931 
932  /*
933  * Remove the LCI and frame type.
934  */
936 
937  /*
938  * Extract the X.25 addresses and convert them to ASCII strings,
939  * and remove them.
940  *
941  * Address block is mandatory in call request packets
942  */
943  addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
944  if (addr_len <= 0)
945  goto out_clear_request;
946  skb_pull(skb, addr_len);
947 
948  /*
949  * Get the length of the facilities, skip past them for the moment
950  * get the call user data because this is needed to determine
951  * the correct listener
952  *
953  * Facilities length is mandatory in call request packets
954  */
955  if (!pskb_may_pull(skb, 1))
956  goto out_clear_request;
957  len = skb->data[0] + 1;
958  if (!pskb_may_pull(skb, len))
959  goto out_clear_request;
960  skb_pull(skb,len);
961 
962  /*
963  * Ensure that the amount of call user data is valid.
964  */
965  if (skb->len > X25_MAX_CUD_LEN)
966  goto out_clear_request;
967 
968  /*
969  * Get all the call user data so it can be used in
970  * x25_find_listener and skb_copy_from_linear_data up ahead.
971  */
972  if (!pskb_may_pull(skb, skb->len))
973  goto out_clear_request;
974 
975  /*
976  * Find a listener for the particular address/cud pair.
977  */
978  sk = x25_find_listener(&source_addr,skb);
979  skb_push(skb,len);
980 
981  if (sk != NULL && sk_acceptq_is_full(sk)) {
982  goto out_sock_put;
983  }
984 
985  /*
986  * We dont have any listeners for this incoming call.
987  * Try forwarding it.
988  */
989  if (sk == NULL) {
990  skb_push(skb, addr_len + X25_STD_MIN_LEN);
991  if (sysctl_x25_forward &&
992  x25_forward_call(&dest_addr, nb, skb, lci) > 0)
993  {
994  /* Call was forwarded, dont process it any more */
995  kfree_skb(skb);
996  rc = 1;
997  goto out;
998  } else {
999  /* No listeners, can't forward, clear the call */
1000  goto out_clear_request;
1001  }
1002  }
1003 
1004  /*
1005  * Try to reach a compromise on the requested facilities.
1006  */
1007  len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1008  if (len == -1)
1009  goto out_sock_put;
1010 
1011  /*
1012  * current neighbour/link might impose additional limits
1013  * on certain facilties
1014  */
1015 
1016  x25_limit_facilities(&facilities, nb);
1017 
1018  /*
1019  * Try to create a new socket.
1020  */
1021  make = x25_make_new(sk);
1022  if (!make)
1023  goto out_sock_put;
1024 
1025  /*
1026  * Remove the facilities
1027  */
1028  skb_pull(skb, len);
1029 
1030  skb->sk = make;
1031  make->sk_state = TCP_ESTABLISHED;
1032 
1033  makex25 = x25_sk(make);
1034  makex25->lci = lci;
1035  makex25->dest_addr = dest_addr;
1036  makex25->source_addr = source_addr;
1037  makex25->neighbour = nb;
1038  makex25->facilities = facilities;
1039  makex25->dte_facilities= dte_facilities;
1040  makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1041  /* ensure no reverse facil on accept */
1042  makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1043  /* ensure no calling address extension on accept */
1044  makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1045  makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1046 
1047  /* Normally all calls are accepted immediately */
1048  if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1050  makex25->state = X25_STATE_3;
1051  }
1052 
1053  /*
1054  * Incoming Call User Data.
1055  */
1056  skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1057  makex25->calluserdata.cudlength = skb->len;
1058 
1059  sk->sk_ack_backlog++;
1060 
1061  x25_insert_socket(make);
1062 
1063  skb_queue_head(&sk->sk_receive_queue, skb);
1064 
1065  x25_start_heartbeat(make);
1066 
1067  if (!sock_flag(sk, SOCK_DEAD))
1068  sk->sk_data_ready(sk, skb->len);
1069  rc = 1;
1070  sock_put(sk);
1071 out:
1072  return rc;
1073 out_sock_put:
1074  sock_put(sk);
1075 out_clear_request:
1076  rc = 0;
1077  x25_transmit_clear_request(nb, lci, 0x01);
1078  goto out;
1079 }
1080 
1081 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1082  struct msghdr *msg, size_t len)
1083 {
1084  struct sock *sk = sock->sk;
1085  struct x25_sock *x25 = x25_sk(sk);
1086  struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1087  struct sockaddr_x25 sx25;
1088  struct sk_buff *skb;
1089  unsigned char *asmptr;
1090  int noblock = msg->msg_flags & MSG_DONTWAIT;
1091  size_t size;
1092  int qbit = 0, rc = -EINVAL;
1093 
1094  lock_sock(sk);
1096  goto out;
1097 
1098  /* we currently don't support segmented records at the user interface */
1099  if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1100  goto out;
1101 
1102  rc = -EADDRNOTAVAIL;
1103  if (sock_flag(sk, SOCK_ZAPPED))
1104  goto out;
1105 
1106  rc = -EPIPE;
1107  if (sk->sk_shutdown & SEND_SHUTDOWN) {
1108  send_sig(SIGPIPE, current, 0);
1109  goto out;
1110  }
1111 
1112  rc = -ENETUNREACH;
1113  if (!x25->neighbour)
1114  goto out;
1115 
1116  if (usx25) {
1117  rc = -EINVAL;
1118  if (msg->msg_namelen < sizeof(sx25))
1119  goto out;
1120  memcpy(&sx25, usx25, sizeof(sx25));
1121  rc = -EISCONN;
1122  if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1123  goto out;
1124  rc = -EINVAL;
1125  if (sx25.sx25_family != AF_X25)
1126  goto out;
1127  } else {
1128  /*
1129  * FIXME 1003.1g - if the socket is like this because
1130  * it has become closed (not started closed) we ought
1131  * to SIGPIPE, EPIPE;
1132  */
1133  rc = -ENOTCONN;
1134  if (sk->sk_state != TCP_ESTABLISHED)
1135  goto out;
1136 
1137  sx25.sx25_family = AF_X25;
1138  sx25.sx25_addr = x25->dest_addr;
1139  }
1140 
1141  /* Sanity check the packet size */
1142  if (len > 65535) {
1143  rc = -EMSGSIZE;
1144  goto out;
1145  }
1146 
1147  SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1148 
1149  /* Build a packet */
1150  SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1151 
1152  if ((msg->msg_flags & MSG_OOB) && len > 32)
1153  len = 32;
1154 
1156 
1157  release_sock(sk);
1158  skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1159  lock_sock(sk);
1160  if (!skb)
1161  goto out;
1162  X25_SKB_CB(skb)->flags = msg->msg_flags;
1163 
1164  skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1165 
1166  /*
1167  * Put the data on the end
1168  */
1169  SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1170 
1171  skb_reset_transport_header(skb);
1172  skb_put(skb, len);
1173 
1174  rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1175  if (rc)
1176  goto out_kfree_skb;
1177 
1178  /*
1179  * If the Q BIT Include socket option is in force, the first
1180  * byte of the user data is the logical value of the Q Bit.
1181  */
1182  if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1183  if (!pskb_may_pull(skb, 1))
1184  goto out_kfree_skb;
1185 
1186  qbit = skb->data[0];
1187  skb_pull(skb, 1);
1188  }
1189 
1190  /*
1191  * Push down the X.25 header
1192  */
1193  SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1194 
1195  if (msg->msg_flags & MSG_OOB) {
1196  if (x25->neighbour->extended) {
1197  asmptr = skb_push(skb, X25_STD_MIN_LEN);
1198  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1199  *asmptr++ = (x25->lci >> 0) & 0xFF;
1200  *asmptr++ = X25_INTERRUPT;
1201  } else {
1202  asmptr = skb_push(skb, X25_STD_MIN_LEN);
1203  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1204  *asmptr++ = (x25->lci >> 0) & 0xFF;
1205  *asmptr++ = X25_INTERRUPT;
1206  }
1207  } else {
1208  if (x25->neighbour->extended) {
1209  /* Build an Extended X.25 header */
1210  asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1211  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1212  *asmptr++ = (x25->lci >> 0) & 0xFF;
1213  *asmptr++ = X25_DATA;
1214  *asmptr++ = X25_DATA;
1215  } else {
1216  /* Build an Standard X.25 header */
1217  asmptr = skb_push(skb, X25_STD_MIN_LEN);
1218  *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219  *asmptr++ = (x25->lci >> 0) & 0xFF;
1220  *asmptr++ = X25_DATA;
1221  }
1222 
1223  if (qbit)
1224  skb->data[0] |= X25_Q_BIT;
1225  }
1226 
1227  SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1228  SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1229 
1230  rc = -ENOTCONN;
1231  if (sk->sk_state != TCP_ESTABLISHED)
1232  goto out_kfree_skb;
1233 
1234  if (msg->msg_flags & MSG_OOB)
1235  skb_queue_tail(&x25->interrupt_out_queue, skb);
1236  else {
1237  rc = x25_output(sk, skb);
1238  len = rc;
1239  if (rc < 0)
1240  kfree_skb(skb);
1241  else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1242  len++;
1243  }
1244 
1245  x25_kick(sk);
1246  rc = len;
1247 out:
1248  release_sock(sk);
1249  return rc;
1250 out_kfree_skb:
1251  kfree_skb(skb);
1252  goto out;
1253 }
1254 
1255 
1256 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1257  struct msghdr *msg, size_t size,
1258  int flags)
1259 {
1260  struct sock *sk = sock->sk;
1261  struct x25_sock *x25 = x25_sk(sk);
1262  struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1263  size_t copied;
1264  int qbit, header_len;
1265  struct sk_buff *skb;
1266  unsigned char *asmptr;
1267  int rc = -ENOTCONN;
1268 
1269  lock_sock(sk);
1270 
1271  if (x25->neighbour == NULL)
1272  goto out;
1273 
1274  header_len = x25->neighbour->extended ?
1275  X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1276 
1277  /*
1278  * This works for seqpacket too. The receiver has ordered the queue for
1279  * us! We do one quick check first though
1280  */
1281  if (sk->sk_state != TCP_ESTABLISHED)
1282  goto out;
1283 
1284  if (flags & MSG_OOB) {
1285  rc = -EINVAL;
1286  if (sock_flag(sk, SOCK_URGINLINE) ||
1287  !skb_peek(&x25->interrupt_in_queue))
1288  goto out;
1289 
1290  skb = skb_dequeue(&x25->interrupt_in_queue);
1291 
1292  if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1293  goto out_free_dgram;
1294 
1295  skb_pull(skb, X25_STD_MIN_LEN);
1296 
1297  /*
1298  * No Q bit information on Interrupt data.
1299  */
1300  if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1301  asmptr = skb_push(skb, 1);
1302  *asmptr = 0x00;
1303  }
1304 
1305  msg->msg_flags |= MSG_OOB;
1306  } else {
1307  /* Now we can treat all alike */
1308  release_sock(sk);
1309  skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1310  flags & MSG_DONTWAIT, &rc);
1311  lock_sock(sk);
1312  if (!skb)
1313  goto out;
1314 
1315  if (!pskb_may_pull(skb, header_len))
1316  goto out_free_dgram;
1317 
1318  qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1319 
1320  skb_pull(skb, header_len);
1321 
1322  if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1323  asmptr = skb_push(skb, 1);
1324  *asmptr = qbit;
1325  }
1326  }
1327 
1328  skb_reset_transport_header(skb);
1329  copied = skb->len;
1330 
1331  if (copied > size) {
1332  copied = size;
1333  msg->msg_flags |= MSG_TRUNC;
1334  }
1335 
1336  /* Currently, each datagram always contains a complete record */
1337  msg->msg_flags |= MSG_EOR;
1338 
1339  rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1340  if (rc)
1341  goto out_free_dgram;
1342 
1343  if (sx25) {
1344  sx25->sx25_family = AF_X25;
1345  sx25->sx25_addr = x25->dest_addr;
1346  }
1347 
1348  msg->msg_namelen = sizeof(struct sockaddr_x25);
1349 
1350  x25_check_rbuf(sk);
1351  rc = copied;
1352 out_free_dgram:
1353  skb_free_datagram(sk, skb);
1354 out:
1355  release_sock(sk);
1356  return rc;
1357 }
1358 
1359 
1360 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1361 {
1362  struct sock *sk = sock->sk;
1363  struct x25_sock *x25 = x25_sk(sk);
1364  void __user *argp = (void __user *)arg;
1365  int rc;
1366 
1367  switch (cmd) {
1368  case TIOCOUTQ: {
1369  int amount;
1370 
1371  amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1372  if (amount < 0)
1373  amount = 0;
1374  rc = put_user(amount, (unsigned int __user *)argp);
1375  break;
1376  }
1377 
1378  case TIOCINQ: {
1379  struct sk_buff *skb;
1380  int amount = 0;
1381  /*
1382  * These two are safe on a single CPU system as
1383  * only user tasks fiddle here
1384  */
1385  lock_sock(sk);
1386  if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1387  amount = skb->len;
1388  release_sock(sk);
1389  rc = put_user(amount, (unsigned int __user *)argp);
1390  break;
1391  }
1392 
1393  case SIOCGSTAMP:
1394  rc = -EINVAL;
1395  if (sk)
1396  rc = sock_get_timestamp(sk,
1397  (struct timeval __user *)argp);
1398  break;
1399  case SIOCGSTAMPNS:
1400  rc = -EINVAL;
1401  if (sk)
1402  rc = sock_get_timestampns(sk,
1403  (struct timespec __user *)argp);
1404  break;
1405  case SIOCGIFADDR:
1406  case SIOCSIFADDR:
1407  case SIOCGIFDSTADDR:
1408  case SIOCSIFDSTADDR:
1409  case SIOCGIFBRDADDR:
1410  case SIOCSIFBRDADDR:
1411  case SIOCGIFNETMASK:
1412  case SIOCSIFNETMASK:
1413  case SIOCGIFMETRIC:
1414  case SIOCSIFMETRIC:
1415  rc = -EINVAL;
1416  break;
1417  case SIOCADDRT:
1418  case SIOCDELRT:
1419  rc = -EPERM;
1420  if (!capable(CAP_NET_ADMIN))
1421  break;
1422  rc = x25_route_ioctl(cmd, argp);
1423  break;
1424  case SIOCX25GSUBSCRIP:
1425  rc = x25_subscr_ioctl(cmd, argp);
1426  break;
1427  case SIOCX25SSUBSCRIP:
1428  rc = -EPERM;
1429  if (!capable(CAP_NET_ADMIN))
1430  break;
1431  rc = x25_subscr_ioctl(cmd, argp);
1432  break;
1433  case SIOCX25GFACILITIES: {
1434  lock_sock(sk);
1435  rc = copy_to_user(argp, &x25->facilities,
1436  sizeof(x25->facilities))
1437  ? -EFAULT : 0;
1438  release_sock(sk);
1439  break;
1440  }
1441 
1442  case SIOCX25SFACILITIES: {
1443  struct x25_facilities facilities;
1444  rc = -EFAULT;
1445  if (copy_from_user(&facilities, argp, sizeof(facilities)))
1446  break;
1447  rc = -EINVAL;
1448  lock_sock(sk);
1449  if (sk->sk_state != TCP_LISTEN &&
1450  sk->sk_state != TCP_CLOSE)
1451  goto out_fac_release;
1452  if (facilities.pacsize_in < X25_PS16 ||
1453  facilities.pacsize_in > X25_PS4096)
1454  goto out_fac_release;
1455  if (facilities.pacsize_out < X25_PS16 ||
1456  facilities.pacsize_out > X25_PS4096)
1457  goto out_fac_release;
1458  if (facilities.winsize_in < 1 ||
1459  facilities.winsize_in > 127)
1460  goto out_fac_release;
1461  if (facilities.throughput) {
1462  int out = facilities.throughput & 0xf0;
1463  int in = facilities.throughput & 0x0f;
1464  if (!out)
1465  facilities.throughput |=
1467  else if (out < 0x30 || out > 0xD0)
1468  goto out_fac_release;
1469  if (!in)
1470  facilities.throughput |=
1472  else if (in < 0x03 || in > 0x0D)
1473  goto out_fac_release;
1474  }
1475  if (facilities.reverse &&
1476  (facilities.reverse & 0x81) != 0x81)
1477  goto out_fac_release;
1478  x25->facilities = facilities;
1479  rc = 0;
1480 out_fac_release:
1481  release_sock(sk);
1482  break;
1483  }
1484 
1485  case SIOCX25GDTEFACILITIES: {
1486  lock_sock(sk);
1487  rc = copy_to_user(argp, &x25->dte_facilities,
1488  sizeof(x25->dte_facilities));
1489  release_sock(sk);
1490  if (rc)
1491  rc = -EFAULT;
1492  break;
1493  }
1494 
1495  case SIOCX25SDTEFACILITIES: {
1496  struct x25_dte_facilities dtefacs;
1497  rc = -EFAULT;
1498  if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1499  break;
1500  rc = -EINVAL;
1501  lock_sock(sk);
1502  if (sk->sk_state != TCP_LISTEN &&
1503  sk->sk_state != TCP_CLOSE)
1504  goto out_dtefac_release;
1505  if (dtefacs.calling_len > X25_MAX_AE_LEN)
1506  goto out_dtefac_release;
1507  if (dtefacs.calling_ae == NULL)
1508  goto out_dtefac_release;
1509  if (dtefacs.called_len > X25_MAX_AE_LEN)
1510  goto out_dtefac_release;
1511  if (dtefacs.called_ae == NULL)
1512  goto out_dtefac_release;
1513  x25->dte_facilities = dtefacs;
1514  rc = 0;
1515 out_dtefac_release:
1516  release_sock(sk);
1517  break;
1518  }
1519 
1520  case SIOCX25GCALLUSERDATA: {
1521  lock_sock(sk);
1522  rc = copy_to_user(argp, &x25->calluserdata,
1523  sizeof(x25->calluserdata))
1524  ? -EFAULT : 0;
1525  release_sock(sk);
1526  break;
1527  }
1528 
1529  case SIOCX25SCALLUSERDATA: {
1530  struct x25_calluserdata calluserdata;
1531 
1532  rc = -EFAULT;
1533  if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1534  break;
1535  rc = -EINVAL;
1536  if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1537  break;
1538  lock_sock(sk);
1539  x25->calluserdata = calluserdata;
1540  release_sock(sk);
1541  rc = 0;
1542  break;
1543  }
1544 
1545  case SIOCX25GCAUSEDIAG: {
1546  lock_sock(sk);
1547  rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1548  ? -EFAULT : 0;
1549  release_sock(sk);
1550  break;
1551  }
1552 
1553  case SIOCX25SCAUSEDIAG: {
1554  struct x25_causediag causediag;
1555  rc = -EFAULT;
1556  if (copy_from_user(&causediag, argp, sizeof(causediag)))
1557  break;
1558  lock_sock(sk);
1559  x25->causediag = causediag;
1560  release_sock(sk);
1561  rc = 0;
1562  break;
1563 
1564  }
1565 
1566  case SIOCX25SCUDMATCHLEN: {
1567  struct x25_subaddr sub_addr;
1568  rc = -EINVAL;
1569  lock_sock(sk);
1570  if(sk->sk_state != TCP_CLOSE)
1571  goto out_cud_release;
1572  rc = -EFAULT;
1573  if (copy_from_user(&sub_addr, argp,
1574  sizeof(sub_addr)))
1575  goto out_cud_release;
1576  rc = -EINVAL;
1577  if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1578  goto out_cud_release;
1579  x25->cudmatchlength = sub_addr.cudmatchlength;
1580  rc = 0;
1581 out_cud_release:
1582  release_sock(sk);
1583  break;
1584  }
1585 
1586  case SIOCX25CALLACCPTAPPRV: {
1587  rc = -EINVAL;
1588  lock_sock(sk);
1589  if (sk->sk_state != TCP_CLOSE)
1590  break;
1592  release_sock(sk);
1593  rc = 0;
1594  break;
1595  }
1596 
1597  case SIOCX25SENDCALLACCPT: {
1598  rc = -EINVAL;
1599  lock_sock(sk);
1600  if (sk->sk_state != TCP_ESTABLISHED)
1601  break;
1602  /* must call accptapprv above */
1603  if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1604  break;
1606  x25->state = X25_STATE_3;
1607  release_sock(sk);
1608  rc = 0;
1609  break;
1610  }
1611 
1612  default:
1613  rc = -ENOIOCTLCMD;
1614  break;
1615  }
1616 
1617  return rc;
1618 }
1619 
1620 static const struct net_proto_family x25_family_ops = {
1621  .family = AF_X25,
1622  .create = x25_create,
1623  .owner = THIS_MODULE,
1624 };
1625 
1626 #ifdef CONFIG_COMPAT
1627 static int compat_x25_subscr_ioctl(unsigned int cmd,
1628  struct compat_x25_subscrip_struct __user *x25_subscr32)
1629 {
1630  struct compat_x25_subscrip_struct x25_subscr;
1631  struct x25_neigh *nb;
1632  struct net_device *dev;
1633  int rc = -EINVAL;
1634 
1635  rc = -EFAULT;
1636  if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637  goto out;
1638 
1639  rc = -EINVAL;
1640  dev = x25_dev_get(x25_subscr.device);
1641  if (dev == NULL)
1642  goto out;
1643 
1644  nb = x25_get_neigh(dev);
1645  if (nb == NULL)
1646  goto out_dev_put;
1647 
1648  dev_put(dev);
1649 
1650  if (cmd == SIOCX25GSUBSCRIP) {
1651  read_lock_bh(&x25_neigh_list_lock);
1652  x25_subscr.extended = nb->extended;
1653  x25_subscr.global_facil_mask = nb->global_facil_mask;
1654  read_unlock_bh(&x25_neigh_list_lock);
1655  rc = copy_to_user(x25_subscr32, &x25_subscr,
1656  sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657  } else {
1658  rc = -EINVAL;
1659  if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660  rc = 0;
1661  write_lock_bh(&x25_neigh_list_lock);
1662  nb->extended = x25_subscr.extended;
1663  nb->global_facil_mask = x25_subscr.global_facil_mask;
1664  write_unlock_bh(&x25_neigh_list_lock);
1665  }
1666  }
1667  x25_neigh_put(nb);
1668 out:
1669  return rc;
1670 out_dev_put:
1671  dev_put(dev);
1672  goto out;
1673 }
1674 
1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676  unsigned long arg)
1677 {
1678  void __user *argp = compat_ptr(arg);
1679  struct sock *sk = sock->sk;
1680 
1681  int rc = -ENOIOCTLCMD;
1682 
1683  switch(cmd) {
1684  case TIOCOUTQ:
1685  case TIOCINQ:
1686  rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1687  break;
1688  case SIOCGSTAMP:
1689  rc = -EINVAL;
1690  if (sk)
1691  rc = compat_sock_get_timestamp(sk,
1692  (struct timeval __user*)argp);
1693  break;
1694  case SIOCGSTAMPNS:
1695  rc = -EINVAL;
1696  if (sk)
1698  (struct timespec __user*)argp);
1699  break;
1700  case SIOCGIFADDR:
1701  case SIOCSIFADDR:
1702  case SIOCGIFDSTADDR:
1703  case SIOCSIFDSTADDR:
1704  case SIOCGIFBRDADDR:
1705  case SIOCSIFBRDADDR:
1706  case SIOCGIFNETMASK:
1707  case SIOCSIFNETMASK:
1708  case SIOCGIFMETRIC:
1709  case SIOCSIFMETRIC:
1710  rc = -EINVAL;
1711  break;
1712  case SIOCADDRT:
1713  case SIOCDELRT:
1714  rc = -EPERM;
1715  if (!capable(CAP_NET_ADMIN))
1716  break;
1717  rc = x25_route_ioctl(cmd, argp);
1718  break;
1719  case SIOCX25GSUBSCRIP:
1720  rc = compat_x25_subscr_ioctl(cmd, argp);
1721  break;
1722  case SIOCX25SSUBSCRIP:
1723  rc = -EPERM;
1724  if (!capable(CAP_NET_ADMIN))
1725  break;
1726  rc = compat_x25_subscr_ioctl(cmd, argp);
1727  break;
1728  case SIOCX25GFACILITIES:
1729  case SIOCX25SFACILITIES:
1730  case SIOCX25GDTEFACILITIES:
1731  case SIOCX25SDTEFACILITIES:
1732  case SIOCX25GCALLUSERDATA:
1733  case SIOCX25SCALLUSERDATA:
1734  case SIOCX25GCAUSEDIAG:
1735  case SIOCX25SCAUSEDIAG:
1736  case SIOCX25SCUDMATCHLEN:
1737  case SIOCX25CALLACCPTAPPRV:
1738  case SIOCX25SENDCALLACCPT:
1739  rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1740  break;
1741  default:
1742  rc = -ENOIOCTLCMD;
1743  break;
1744  }
1745  return rc;
1746 }
1747 #endif
1748 
1749 static const struct proto_ops x25_proto_ops = {
1750  .family = AF_X25,
1751  .owner = THIS_MODULE,
1752  .release = x25_release,
1753  .bind = x25_bind,
1754  .connect = x25_connect,
1755  .socketpair = sock_no_socketpair,
1756  .accept = x25_accept,
1757  .getname = x25_getname,
1758  .poll = datagram_poll,
1759  .ioctl = x25_ioctl,
1760 #ifdef CONFIG_COMPAT
1761  .compat_ioctl = compat_x25_ioctl,
1762 #endif
1763  .listen = x25_listen,
1764  .shutdown = sock_no_shutdown,
1765  .setsockopt = x25_setsockopt,
1766  .getsockopt = x25_getsockopt,
1767  .sendmsg = x25_sendmsg,
1768  .recvmsg = x25_recvmsg,
1769  .mmap = sock_no_mmap,
1770  .sendpage = sock_no_sendpage,
1771 };
1772 
1773 static struct packet_type x25_packet_type __read_mostly = {
1774  .type = cpu_to_be16(ETH_P_X25),
1775  .func = x25_lapb_receive_frame,
1776 };
1777 
1778 static struct notifier_block x25_dev_notifier = {
1779  .notifier_call = x25_device_event,
1780 };
1781 
1783 {
1784  struct sock *s;
1785  struct hlist_node *node;
1786 
1787  write_lock_bh(&x25_list_lock);
1788 
1789  sk_for_each(s, node, &x25_list)
1790  if (x25_sk(s)->neighbour == nb)
1791  x25_disconnect(s, ENETUNREACH, 0, 0);
1792 
1793  write_unlock_bh(&x25_list_lock);
1794 
1795  /* Remove any related forwards */
1797 }
1798 
1799 static int __init x25_init(void)
1800 {
1801  int rc = proto_register(&x25_proto, 0);
1802 
1803  if (rc != 0)
1804  goto out;
1805 
1806  rc = sock_register(&x25_family_ops);
1807  if (rc != 0)
1808  goto out_proto;
1809 
1810  dev_add_pack(&x25_packet_type);
1811 
1812  rc = register_netdevice_notifier(&x25_dev_notifier);
1813  if (rc != 0)
1814  goto out_sock;
1815 
1816  printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1817 
1819  rc = x25_proc_init();
1820  if (rc != 0)
1821  goto out_dev;
1822 out:
1823  return rc;
1824 out_dev:
1825  unregister_netdevice_notifier(&x25_dev_notifier);
1826 out_sock:
1828 out_proto:
1829  proto_unregister(&x25_proto);
1830  goto out;
1831 }
1832 module_init(x25_init);
1833 
1834 static void __exit x25_exit(void)
1835 {
1836  x25_proc_exit();
1837  x25_link_free();
1838  x25_route_free();
1839 
1841 
1842  unregister_netdevice_notifier(&x25_dev_notifier);
1843 
1844  dev_remove_pack(&x25_packet_type);
1845 
1847  proto_unregister(&x25_proto);
1848 }
1849 module_exit(x25_exit);
1850 
1851 MODULE_AUTHOR("Jonathan Naylor <[email protected]>");
1852 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853 MODULE_LICENSE("GPL");