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Linux/net/x25/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 #define pr_fmt(fmt) "X25: " fmt
 39 
 40 #include <linux/module.h>
 41 #include <linux/capability.h>
 42 #include <linux/errno.h>
 43 #include <linux/kernel.h>
 44 #include <linux/sched/signal.h>
 45 #include <linux/timer.h>
 46 #include <linux/string.h>
 47 #include <linux/net.h>
 48 #include <linux/netdevice.h>
 49 #include <linux/if_arp.h>
 50 #include <linux/skbuff.h>
 51 #include <linux/slab.h>
 52 #include <net/sock.h>
 53 #include <net/tcp_states.h>
 54 #include <linux/uaccess.h>
 55 #include <linux/fcntl.h>
 56 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
 57 #include <linux/notifier.h>
 58 #include <linux/init.h>
 59 #include <linux/compat.h>
 60 #include <linux/ctype.h>
 61 
 62 #include <net/x25.h>
 63 #include <net/compat.h>
 64 
 65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
 66 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
 67 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
 68 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
 69 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
 70 int sysctl_x25_forward                 = 0;
 71 
 72 HLIST_HEAD(x25_list);
 73 DEFINE_RWLOCK(x25_list_lock);
 74 
 75 static const struct proto_ops x25_proto_ops;
 76 
 77 static const struct x25_address null_x25_address = {"               "};
 78 
 79 #ifdef CONFIG_COMPAT
 80 struct compat_x25_subscrip_struct {
 81         char device[200-sizeof(compat_ulong_t)];
 82         compat_ulong_t global_facil_mask;
 83         compat_uint_t extended;
 84 };
 85 #endif
 86 
 87 
 88 int x25_parse_address_block(struct sk_buff *skb,
 89                 struct x25_address *called_addr,
 90                 struct x25_address *calling_addr)
 91 {
 92         unsigned char len;
 93         int needed;
 94         int rc;
 95 
 96         if (!pskb_may_pull(skb, 1)) {
 97                 /* packet has no address block */
 98                 rc = 0;
 99                 goto empty;
100         }
101 
102         len = *skb->data;
103         needed = 1 + (len >> 4) + (len & 0x0f);
104 
105         if (!pskb_may_pull(skb, needed)) {
106                 /* packet is too short to hold the addresses it claims
107                    to hold */
108                 rc = -1;
109                 goto empty;
110         }
111 
112         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
113 
114 empty:
115         *called_addr->x25_addr = 0;
116         *calling_addr->x25_addr = 0;
117 
118         return rc;
119 }
120 
121 
122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123                   struct x25_address *calling_addr)
124 {
125         unsigned int called_len, calling_len;
126         char *called, *calling;
127         unsigned int i;
128 
129         called_len  = (*p >> 0) & 0x0F;
130         calling_len = (*p >> 4) & 0x0F;
131 
132         called  = called_addr->x25_addr;
133         calling = calling_addr->x25_addr;
134         p++;
135 
136         for (i = 0; i < (called_len + calling_len); i++) {
137                 if (i < called_len) {
138                         if (i % 2 != 0) {
139                                 *called++ = ((*p >> 0) & 0x0F) + '';
140                                 p++;
141                         } else {
142                                 *called++ = ((*p >> 4) & 0x0F) + '';
143                         }
144                 } else {
145                         if (i % 2 != 0) {
146                                 *calling++ = ((*p >> 0) & 0x0F) + '';
147                                 p++;
148                         } else {
149                                 *calling++ = ((*p >> 4) & 0x0F) + '';
150                         }
151                 }
152         }
153 
154         *called = *calling = '\0';
155 
156         return 1 + (called_len + calling_len + 1) / 2;
157 }
158 
159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160                   struct x25_address *calling_addr)
161 {
162         unsigned int called_len, calling_len;
163         char *called, *calling;
164         int i;
165 
166         called  = called_addr->x25_addr;
167         calling = calling_addr->x25_addr;
168 
169         called_len  = strlen(called);
170         calling_len = strlen(calling);
171 
172         *p++ = (calling_len << 4) | (called_len << 0);
173 
174         for (i = 0; i < (called_len + calling_len); i++) {
175                 if (i < called_len) {
176                         if (i % 2 != 0) {
177                                 *p |= (*called++ - '') << 0;
178                                 p++;
179                         } else {
180                                 *p = 0x00;
181                                 *p |= (*called++ - '') << 4;
182                         }
183                 } else {
184                         if (i % 2 != 0) {
185                                 *p |= (*calling++ - '') << 0;
186                                 p++;
187                         } else {
188                                 *p = 0x00;
189                                 *p |= (*calling++ - '') << 4;
190                         }
191                 }
192         }
193 
194         return 1 + (called_len + calling_len + 1) / 2;
195 }
196 
197 /*
198  *      Socket removal during an interrupt is now safe.
199  */
200 static void x25_remove_socket(struct sock *sk)
201 {
202         write_lock_bh(&x25_list_lock);
203         sk_del_node_init(sk);
204         write_unlock_bh(&x25_list_lock);
205 }
206 
207 /*
208  *      Kill all bound sockets on a dropped device.
209  */
210 static void x25_kill_by_device(struct net_device *dev)
211 {
212         struct sock *s;
213 
214         write_lock_bh(&x25_list_lock);
215 
216         sk_for_each(s, &x25_list)
217                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218                         x25_disconnect(s, ENETUNREACH, 0, 0);
219 
220         write_unlock_bh(&x25_list_lock);
221 }
222 
223 /*
224  *      Handle device status changes.
225  */
226 static int x25_device_event(struct notifier_block *this, unsigned long event,
227                             void *ptr)
228 {
229         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
230         struct x25_neigh *nb;
231 
232         if (!net_eq(dev_net(dev), &init_net))
233                 return NOTIFY_DONE;
234 
235         if (dev->type == ARPHRD_X25
236 #if IS_ENABLED(CONFIG_LLC)
237          || dev->type == ARPHRD_ETHER
238 #endif
239          ) {
240                 switch (event) {
241                 case NETDEV_UP:
242                         x25_link_device_up(dev);
243                         break;
244                 case NETDEV_GOING_DOWN:
245                         nb = x25_get_neigh(dev);
246                         if (nb) {
247                                 x25_terminate_link(nb);
248                                 x25_neigh_put(nb);
249                         }
250                         break;
251                 case NETDEV_DOWN:
252                         x25_kill_by_device(dev);
253                         x25_route_device_down(dev);
254                         x25_link_device_down(dev);
255                         break;
256                 }
257         }
258 
259         return NOTIFY_DONE;
260 }
261 
262 /*
263  *      Add a socket to the bound sockets list.
264  */
265 static void x25_insert_socket(struct sock *sk)
266 {
267         write_lock_bh(&x25_list_lock);
268         sk_add_node(sk, &x25_list);
269         write_unlock_bh(&x25_list_lock);
270 }
271 
272 /*
273  *      Find a socket that wants to accept the Call Request we just
274  *      received. Check the full list for an address/cud match.
275  *      If no cuds match return the next_best thing, an address match.
276  *      Note: if a listening socket has cud set it must only get calls
277  *      with matching cud.
278  */
279 static struct sock *x25_find_listener(struct x25_address *addr,
280                                         struct sk_buff *skb)
281 {
282         struct sock *s;
283         struct sock *next_best;
284 
285         read_lock_bh(&x25_list_lock);
286         next_best = NULL;
287 
288         sk_for_each(s, &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 
327         sk_for_each(s, &x25_list)
328                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329                         sock_hold(s);
330                         goto found;
331                 }
332         s = NULL;
333 found:
334         return s;
335 }
336 
337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338 {
339         struct sock *s;
340 
341         read_lock_bh(&x25_list_lock);
342         s = __x25_find_socket(lci, nb);
343         read_unlock_bh(&x25_list_lock);
344         return s;
345 }
346 
347 /*
348  *      Find a unique LCI for a given device.
349  */
350 static unsigned int x25_new_lci(struct x25_neigh *nb)
351 {
352         unsigned int lci = 1;
353         struct sock *sk;
354 
355         read_lock_bh(&x25_list_lock);
356 
357         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
358                 sock_put(sk);
359                 if (++lci == 4096) {
360                         lci = 0;
361                         break;
362                 }
363         }
364 
365         read_unlock_bh(&x25_list_lock);
366         return lci;
367 }
368 
369 /*
370  *      Deferred destroy.
371  */
372 static void __x25_destroy_socket(struct sock *);
373 
374 /*
375  *      handler for deferred kills.
376  */
377 static void x25_destroy_timer(unsigned long data)
378 {
379         x25_destroy_socket_from_timer((struct sock *)data);
380 }
381 
382 /*
383  *      This is called from user mode and the timers. Thus it protects itself
384  *      against interrupt users but doesn't worry about being called during
385  *      work. Once it is removed from the queue no interrupt or bottom half
386  *      will touch it and we are (fairly 8-) ) safe.
387  *      Not static as it's used by the timer
388  */
389 static void __x25_destroy_socket(struct sock *sk)
390 {
391         struct sk_buff *skb;
392 
393         x25_stop_heartbeat(sk);
394         x25_stop_timer(sk);
395 
396         x25_remove_socket(sk);
397         x25_clear_queues(sk);           /* Flush the queues */
398 
399         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
400                 if (skb->sk != sk) {            /* A pending connection */
401                         /*
402                          * Queue the unaccepted socket for death
403                          */
404                         skb->sk->sk_state = TCP_LISTEN;
405                         sock_set_flag(skb->sk, SOCK_DEAD);
406                         x25_start_heartbeat(skb->sk);
407                         x25_sk(skb->sk)->state = X25_STATE_0;
408                 }
409 
410                 kfree_skb(skb);
411         }
412 
413         if (sk_has_allocations(sk)) {
414                 /* Defer: outstanding buffers */
415                 sk->sk_timer.expires  = jiffies + 10 * HZ;
416                 sk->sk_timer.function = x25_destroy_timer;
417                 sk->sk_timer.data = (unsigned long)sk;
418                 add_timer(&sk->sk_timer);
419         } else {
420                 /* drop last reference so sock_put will free */
421                 __sock_put(sk);
422         }
423 }
424 
425 void x25_destroy_socket_from_timer(struct sock *sk)
426 {
427         sock_hold(sk);
428         bh_lock_sock(sk);
429         __x25_destroy_socket(sk);
430         bh_unlock_sock(sk);
431         sock_put(sk);
432 }
433 
434 /*
435  *      Handling for system calls applied via the various interfaces to a
436  *      X.25 socket object.
437  */
438 
439 static int x25_setsockopt(struct socket *sock, int level, int optname,
440                           char __user *optval, unsigned int optlen)
441 {
442         int opt;
443         struct sock *sk = sock->sk;
444         int rc = -ENOPROTOOPT;
445 
446         if (level != SOL_X25 || optname != X25_QBITINCL)
447                 goto out;
448 
449         rc = -EINVAL;
450         if (optlen < sizeof(int))
451                 goto out;
452 
453         rc = -EFAULT;
454         if (get_user(opt, (int __user *)optval))
455                 goto out;
456 
457         if (opt)
458                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
459         else
460                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
461         rc = 0;
462 out:
463         return rc;
464 }
465 
466 static int x25_getsockopt(struct socket *sock, int level, int optname,
467                           char __user *optval, int __user *optlen)
468 {
469         struct sock *sk = sock->sk;
470         int val, len, rc = -ENOPROTOOPT;
471 
472         if (level != SOL_X25 || optname != X25_QBITINCL)
473                 goto out;
474 
475         rc = -EFAULT;
476         if (get_user(len, optlen))
477                 goto out;
478 
479         len = min_t(unsigned int, len, sizeof(int));
480 
481         rc = -EINVAL;
482         if (len < 0)
483                 goto out;
484 
485         rc = -EFAULT;
486         if (put_user(len, optlen))
487                 goto out;
488 
489         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
490         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
491 out:
492         return rc;
493 }
494 
495 static int x25_listen(struct socket *sock, int backlog)
496 {
497         struct sock *sk = sock->sk;
498         int rc = -EOPNOTSUPP;
499 
500         lock_sock(sk);
501         if (sk->sk_state != TCP_LISTEN) {
502                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
503                 sk->sk_max_ack_backlog = backlog;
504                 sk->sk_state           = TCP_LISTEN;
505                 rc = 0;
506         }
507         release_sock(sk);
508 
509         return rc;
510 }
511 
512 static struct proto x25_proto = {
513         .name     = "X25",
514         .owner    = THIS_MODULE,
515         .obj_size = sizeof(struct x25_sock),
516 };
517 
518 static struct sock *x25_alloc_socket(struct net *net, int kern)
519 {
520         struct x25_sock *x25;
521         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
522 
523         if (!sk)
524                 goto out;
525 
526         sock_init_data(NULL, sk);
527 
528         x25 = x25_sk(sk);
529         skb_queue_head_init(&x25->ack_queue);
530         skb_queue_head_init(&x25->fragment_queue);
531         skb_queue_head_init(&x25->interrupt_in_queue);
532         skb_queue_head_init(&x25->interrupt_out_queue);
533 out:
534         return sk;
535 }
536 
537 static int x25_create(struct net *net, struct socket *sock, int protocol,
538                       int kern)
539 {
540         struct sock *sk;
541         struct x25_sock *x25;
542         int rc = -EAFNOSUPPORT;
543 
544         if (!net_eq(net, &init_net))
545                 goto out;
546 
547         rc = -ESOCKTNOSUPPORT;
548         if (sock->type != SOCK_SEQPACKET)
549                 goto out;
550 
551         rc = -EINVAL;
552         if (protocol)
553                 goto out;
554 
555         rc = -ENOBUFS;
556         if ((sk = x25_alloc_socket(net, kern)) == NULL)
557                 goto out;
558 
559         x25 = x25_sk(sk);
560 
561         sock_init_data(sock, sk);
562 
563         x25_init_timers(sk);
564 
565         sock->ops    = &x25_proto_ops;
566         sk->sk_protocol = protocol;
567         sk->sk_backlog_rcv = x25_backlog_rcv;
568 
569         x25->t21   = sysctl_x25_call_request_timeout;
570         x25->t22   = sysctl_x25_reset_request_timeout;
571         x25->t23   = sysctl_x25_clear_request_timeout;
572         x25->t2    = sysctl_x25_ack_holdback_timeout;
573         x25->state = X25_STATE_0;
574         x25->cudmatchlength = 0;
575         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
576                                                         /* on call accept   */
577 
578         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
579         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
580         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
581         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
582         x25->facilities.throughput  = 0;        /* by default don't negotiate
583                                                    throughput */
584         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
585         x25->dte_facilities.calling_len = 0;
586         x25->dte_facilities.called_len = 0;
587         memset(x25->dte_facilities.called_ae, '\0',
588                         sizeof(x25->dte_facilities.called_ae));
589         memset(x25->dte_facilities.calling_ae, '\0',
590                         sizeof(x25->dte_facilities.calling_ae));
591 
592         rc = 0;
593 out:
594         return rc;
595 }
596 
597 static struct sock *x25_make_new(struct sock *osk)
598 {
599         struct sock *sk = NULL;
600         struct x25_sock *x25, *ox25;
601 
602         if (osk->sk_type != SOCK_SEQPACKET)
603                 goto out;
604 
605         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
606                 goto out;
607 
608         x25 = x25_sk(sk);
609 
610         sk->sk_type        = osk->sk_type;
611         sk->sk_priority    = osk->sk_priority;
612         sk->sk_protocol    = osk->sk_protocol;
613         sk->sk_rcvbuf      = osk->sk_rcvbuf;
614         sk->sk_sndbuf      = osk->sk_sndbuf;
615         sk->sk_state       = TCP_ESTABLISHED;
616         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
617         sock_copy_flags(sk, osk);
618 
619         ox25 = x25_sk(osk);
620         x25->t21        = ox25->t21;
621         x25->t22        = ox25->t22;
622         x25->t23        = ox25->t23;
623         x25->t2         = ox25->t2;
624         x25->flags      = ox25->flags;
625         x25->facilities = ox25->facilities;
626         x25->dte_facilities = ox25->dte_facilities;
627         x25->cudmatchlength = ox25->cudmatchlength;
628 
629         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
630         x25_init_timers(sk);
631 out:
632         return sk;
633 }
634 
635 static int x25_release(struct socket *sock)
636 {
637         struct sock *sk = sock->sk;
638         struct x25_sock *x25;
639 
640         if (!sk)
641                 return 0;
642 
643         x25 = x25_sk(sk);
644 
645         sock_hold(sk);
646         lock_sock(sk);
647         switch (x25->state) {
648 
649                 case X25_STATE_0:
650                 case X25_STATE_2:
651                         x25_disconnect(sk, 0, 0, 0);
652                         __x25_destroy_socket(sk);
653                         goto out;
654 
655                 case X25_STATE_1:
656                 case X25_STATE_3:
657                 case X25_STATE_4:
658                         x25_clear_queues(sk);
659                         x25_write_internal(sk, X25_CLEAR_REQUEST);
660                         x25_start_t23timer(sk);
661                         x25->state = X25_STATE_2;
662                         sk->sk_state    = TCP_CLOSE;
663                         sk->sk_shutdown |= SEND_SHUTDOWN;
664                         sk->sk_state_change(sk);
665                         sock_set_flag(sk, SOCK_DEAD);
666                         sock_set_flag(sk, SOCK_DESTROY);
667                         break;
668         }
669 
670         sock_orphan(sk);
671 out:
672         release_sock(sk);
673         sock_put(sk);
674         return 0;
675 }
676 
677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
678 {
679         struct sock *sk = sock->sk;
680         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
681         int len, i, rc = 0;
682 
683         if (!sock_flag(sk, SOCK_ZAPPED) ||
684             addr_len != sizeof(struct sockaddr_x25) ||
685             addr->sx25_family != AF_X25) {
686                 rc = -EINVAL;
687                 goto out;
688         }
689 
690         len = strlen(addr->sx25_addr.x25_addr);
691         for (i = 0; i < len; i++) {
692                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
693                         rc = -EINVAL;
694                         goto out;
695                 }
696         }
697 
698         lock_sock(sk);
699         x25_sk(sk)->source_addr = addr->sx25_addr;
700         x25_insert_socket(sk);
701         sock_reset_flag(sk, SOCK_ZAPPED);
702         release_sock(sk);
703         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
704 out:
705         return rc;
706 }
707 
708 static int x25_wait_for_connection_establishment(struct sock *sk)
709 {
710         DECLARE_WAITQUEUE(wait, current);
711         int rc;
712 
713         add_wait_queue_exclusive(sk_sleep(sk), &wait);
714         for (;;) {
715                 __set_current_state(TASK_INTERRUPTIBLE);
716                 rc = -ERESTARTSYS;
717                 if (signal_pending(current))
718                         break;
719                 rc = sock_error(sk);
720                 if (rc) {
721                         sk->sk_socket->state = SS_UNCONNECTED;
722                         break;
723                 }
724                 rc = 0;
725                 if (sk->sk_state != TCP_ESTABLISHED) {
726                         release_sock(sk);
727                         schedule();
728                         lock_sock(sk);
729                 } else
730                         break;
731         }
732         __set_current_state(TASK_RUNNING);
733         remove_wait_queue(sk_sleep(sk), &wait);
734         return rc;
735 }
736 
737 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
738                        int addr_len, int flags)
739 {
740         struct sock *sk = sock->sk;
741         struct x25_sock *x25 = x25_sk(sk);
742         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
743         struct x25_route *rt;
744         int rc = 0;
745 
746         lock_sock(sk);
747         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
748                 sock->state = SS_CONNECTED;
749                 goto out; /* Connect completed during a ERESTARTSYS event */
750         }
751 
752         rc = -ECONNREFUSED;
753         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
754                 sock->state = SS_UNCONNECTED;
755                 goto out;
756         }
757 
758         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
759         if (sk->sk_state == TCP_ESTABLISHED)
760                 goto out;
761 
762         sk->sk_state   = TCP_CLOSE;
763         sock->state = SS_UNCONNECTED;
764 
765         rc = -EINVAL;
766         if (addr_len != sizeof(struct sockaddr_x25) ||
767             addr->sx25_family != AF_X25)
768                 goto out;
769 
770         rc = -ENETUNREACH;
771         rt = x25_get_route(&addr->sx25_addr);
772         if (!rt)
773                 goto out;
774 
775         x25->neighbour = x25_get_neigh(rt->dev);
776         if (!x25->neighbour)
777                 goto out_put_route;
778 
779         x25_limit_facilities(&x25->facilities, x25->neighbour);
780 
781         x25->lci = x25_new_lci(x25->neighbour);
782         if (!x25->lci)
783                 goto out_put_neigh;
784 
785         rc = -EINVAL;
786         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
787                 goto out_put_neigh;
788 
789         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
790                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
791 
792         x25->dest_addr = addr->sx25_addr;
793 
794         /* Move to connecting socket, start sending Connect Requests */
795         sock->state   = SS_CONNECTING;
796         sk->sk_state  = TCP_SYN_SENT;
797 
798         x25->state = X25_STATE_1;
799 
800         x25_write_internal(sk, X25_CALL_REQUEST);
801 
802         x25_start_heartbeat(sk);
803         x25_start_t21timer(sk);
804 
805         /* Now the loop */
806         rc = -EINPROGRESS;
807         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
808                 goto out_put_neigh;
809 
810         rc = x25_wait_for_connection_establishment(sk);
811         if (rc)
812                 goto out_put_neigh;
813 
814         sock->state = SS_CONNECTED;
815         rc = 0;
816 out_put_neigh:
817         if (rc)
818                 x25_neigh_put(x25->neighbour);
819 out_put_route:
820         x25_route_put(rt);
821 out:
822         release_sock(sk);
823         return rc;
824 }
825 
826 static int x25_wait_for_data(struct sock *sk, long timeout)
827 {
828         DECLARE_WAITQUEUE(wait, current);
829         int rc = 0;
830 
831         add_wait_queue_exclusive(sk_sleep(sk), &wait);
832         for (;;) {
833                 __set_current_state(TASK_INTERRUPTIBLE);
834                 if (sk->sk_shutdown & RCV_SHUTDOWN)
835                         break;
836                 rc = -ERESTARTSYS;
837                 if (signal_pending(current))
838                         break;
839                 rc = -EAGAIN;
840                 if (!timeout)
841                         break;
842                 rc = 0;
843                 if (skb_queue_empty(&sk->sk_receive_queue)) {
844                         release_sock(sk);
845                         timeout = schedule_timeout(timeout);
846                         lock_sock(sk);
847                 } else
848                         break;
849         }
850         __set_current_state(TASK_RUNNING);
851         remove_wait_queue(sk_sleep(sk), &wait);
852         return rc;
853 }
854 
855 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
856                       bool kern)
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          */
935         skb_pull(skb, X25_STD_MIN_LEN);
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)) {
1049                 x25_write_internal(make, X25_CALL_ACCEPTED);
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);
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 socket *sock, struct msghdr *msg, size_t len)
1082 {
1083         struct sock *sk = sock->sk;
1084         struct x25_sock *x25 = x25_sk(sk);
1085         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1086         struct sockaddr_x25 sx25;
1087         struct sk_buff *skb;
1088         unsigned char *asmptr;
1089         int noblock = msg->msg_flags & MSG_DONTWAIT;
1090         size_t size;
1091         int qbit = 0, rc = -EINVAL;
1092 
1093         lock_sock(sk);
1094         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1095                 goto out;
1096 
1097         /* we currently don't support segmented records at the user interface */
1098         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1099                 goto out;
1100 
1101         rc = -EADDRNOTAVAIL;
1102         if (sock_flag(sk, SOCK_ZAPPED))
1103                 goto out;
1104 
1105         rc = -EPIPE;
1106         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1107                 send_sig(SIGPIPE, current, 0);
1108                 goto out;
1109         }
1110 
1111         rc = -ENETUNREACH;
1112         if (!x25->neighbour)
1113                 goto out;
1114 
1115         if (usx25) {
1116                 rc = -EINVAL;
1117                 if (msg->msg_namelen < sizeof(sx25))
1118                         goto out;
1119                 memcpy(&sx25, usx25, sizeof(sx25));
1120                 rc = -EISCONN;
1121                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1122                         goto out;
1123                 rc = -EINVAL;
1124                 if (sx25.sx25_family != AF_X25)
1125                         goto out;
1126         } else {
1127                 /*
1128                  *      FIXME 1003.1g - if the socket is like this because
1129                  *      it has become closed (not started closed) we ought
1130                  *      to SIGPIPE, EPIPE;
1131                  */
1132                 rc = -ENOTCONN;
1133                 if (sk->sk_state != TCP_ESTABLISHED)
1134                         goto out;
1135 
1136                 sx25.sx25_family = AF_X25;
1137                 sx25.sx25_addr   = x25->dest_addr;
1138         }
1139 
1140         /* Sanity check the packet size */
1141         if (len > 65535) {
1142                 rc = -EMSGSIZE;
1143                 goto out;
1144         }
1145 
1146         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1147 
1148         /* Build a packet */
1149         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1150 
1151         if ((msg->msg_flags & MSG_OOB) && len > 32)
1152                 len = 32;
1153 
1154         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1155 
1156         release_sock(sk);
1157         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1158         lock_sock(sk);
1159         if (!skb)
1160                 goto out;
1161         X25_SKB_CB(skb)->flags = msg->msg_flags;
1162 
1163         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1164 
1165         /*
1166          *      Put the data on the end
1167          */
1168         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1169 
1170         skb_reset_transport_header(skb);
1171         skb_put(skb, len);
1172 
1173         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1174         if (rc)
1175                 goto out_kfree_skb;
1176 
1177         /*
1178          *      If the Q BIT Include socket option is in force, the first
1179          *      byte of the user data is the logical value of the Q Bit.
1180          */
1181         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1182                 if (!pskb_may_pull(skb, 1))
1183                         goto out_kfree_skb;
1184 
1185                 qbit = skb->data[0];
1186                 skb_pull(skb, 1);
1187         }
1188 
1189         /*
1190          *      Push down the X.25 header
1191          */
1192         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1193 
1194         if (msg->msg_flags & MSG_OOB) {
1195                 if (x25->neighbour->extended) {
1196                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1197                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1198                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1199                         *asmptr++ = X25_INTERRUPT;
1200                 } else {
1201                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1202                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1203                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1204                         *asmptr++ = X25_INTERRUPT;
1205                 }
1206         } else {
1207                 if (x25->neighbour->extended) {
1208                         /* Build an Extended X.25 header */
1209                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1210                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1211                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1212                         *asmptr++ = X25_DATA;
1213                         *asmptr++ = X25_DATA;
1214                 } else {
1215                         /* Build an Standard X.25 header */
1216                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1217                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1218                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1219                         *asmptr++ = X25_DATA;
1220                 }
1221 
1222                 if (qbit)
1223                         skb->data[0] |= X25_Q_BIT;
1224         }
1225 
1226         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1227         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1228 
1229         rc = -ENOTCONN;
1230         if (sk->sk_state != TCP_ESTABLISHED)
1231                 goto out_kfree_skb;
1232 
1233         if (msg->msg_flags & MSG_OOB)
1234                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1235         else {
1236                 rc = x25_output(sk, skb);
1237                 len = rc;
1238                 if (rc < 0)
1239                         kfree_skb(skb);
1240                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1241                         len++;
1242         }
1243 
1244         x25_kick(sk);
1245         rc = len;
1246 out:
1247         release_sock(sk);
1248         return rc;
1249 out_kfree_skb:
1250         kfree_skb(skb);
1251         goto out;
1252 }
1253 
1254 
1255 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1256                        int flags)
1257 {
1258         struct sock *sk = sock->sk;
1259         struct x25_sock *x25 = x25_sk(sk);
1260         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1261         size_t copied;
1262         int qbit, header_len;
1263         struct sk_buff *skb;
1264         unsigned char *asmptr;
1265         int rc = -ENOTCONN;
1266 
1267         lock_sock(sk);
1268 
1269         if (x25->neighbour == NULL)
1270                 goto out;
1271 
1272         header_len = x25->neighbour->extended ?
1273                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1274 
1275         /*
1276          * This works for seqpacket too. The receiver has ordered the queue for
1277          * us! We do one quick check first though
1278          */
1279         if (sk->sk_state != TCP_ESTABLISHED)
1280                 goto out;
1281 
1282         if (flags & MSG_OOB) {
1283                 rc = -EINVAL;
1284                 if (sock_flag(sk, SOCK_URGINLINE) ||
1285                     !skb_peek(&x25->interrupt_in_queue))
1286                         goto out;
1287 
1288                 skb = skb_dequeue(&x25->interrupt_in_queue);
1289 
1290                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1291                         goto out_free_dgram;
1292 
1293                 skb_pull(skb, X25_STD_MIN_LEN);
1294 
1295                 /*
1296                  *      No Q bit information on Interrupt data.
1297                  */
1298                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1299                         asmptr  = skb_push(skb, 1);
1300                         *asmptr = 0x00;
1301                 }
1302 
1303                 msg->msg_flags |= MSG_OOB;
1304         } else {
1305                 /* Now we can treat all alike */
1306                 release_sock(sk);
1307                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1308                                         flags & MSG_DONTWAIT, &rc);
1309                 lock_sock(sk);
1310                 if (!skb)
1311                         goto out;
1312 
1313                 if (!pskb_may_pull(skb, header_len))
1314                         goto out_free_dgram;
1315 
1316                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1317 
1318                 skb_pull(skb, header_len);
1319 
1320                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1321                         asmptr  = skb_push(skb, 1);
1322                         *asmptr = qbit;
1323                 }
1324         }
1325 
1326         skb_reset_transport_header(skb);
1327         copied = skb->len;
1328 
1329         if (copied > size) {
1330                 copied = size;
1331                 msg->msg_flags |= MSG_TRUNC;
1332         }
1333 
1334         /* Currently, each datagram always contains a complete record */
1335         msg->msg_flags |= MSG_EOR;
1336 
1337         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1338         if (rc)
1339                 goto out_free_dgram;
1340 
1341         if (sx25) {
1342                 sx25->sx25_family = AF_X25;
1343                 sx25->sx25_addr   = x25->dest_addr;
1344                 msg->msg_namelen = sizeof(*sx25);
1345         }
1346 
1347         x25_check_rbuf(sk);
1348         rc = copied;
1349 out_free_dgram:
1350         skb_free_datagram(sk, skb);
1351 out:
1352         release_sock(sk);
1353         return rc;
1354 }
1355 
1356 
1357 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1358 {
1359         struct sock *sk = sock->sk;
1360         struct x25_sock *x25 = x25_sk(sk);
1361         void __user *argp = (void __user *)arg;
1362         int rc;
1363 
1364         switch (cmd) {
1365         case TIOCOUTQ: {
1366                 int amount;
1367 
1368                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1369                 if (amount < 0)
1370                         amount = 0;
1371                 rc = put_user(amount, (unsigned int __user *)argp);
1372                 break;
1373         }
1374 
1375         case TIOCINQ: {
1376                 struct sk_buff *skb;
1377                 int amount = 0;
1378                 /*
1379                  * These two are safe on a single CPU system as
1380                  * only user tasks fiddle here
1381                  */
1382                 lock_sock(sk);
1383                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1384                         amount = skb->len;
1385                 release_sock(sk);
1386                 rc = put_user(amount, (unsigned int __user *)argp);
1387                 break;
1388         }
1389 
1390         case SIOCGSTAMP:
1391                 rc = -EINVAL;
1392                 if (sk)
1393                         rc = sock_get_timestamp(sk,
1394                                                 (struct timeval __user *)argp);
1395                 break;
1396         case SIOCGSTAMPNS:
1397                 rc = -EINVAL;
1398                 if (sk)
1399                         rc = sock_get_timestampns(sk,
1400                                         (struct timespec __user *)argp);
1401                 break;
1402         case SIOCGIFADDR:
1403         case SIOCSIFADDR:
1404         case SIOCGIFDSTADDR:
1405         case SIOCSIFDSTADDR:
1406         case SIOCGIFBRDADDR:
1407         case SIOCSIFBRDADDR:
1408         case SIOCGIFNETMASK:
1409         case SIOCSIFNETMASK:
1410         case SIOCGIFMETRIC:
1411         case SIOCSIFMETRIC:
1412                 rc = -EINVAL;
1413                 break;
1414         case SIOCADDRT:
1415         case SIOCDELRT:
1416                 rc = -EPERM;
1417                 if (!capable(CAP_NET_ADMIN))
1418                         break;
1419                 rc = x25_route_ioctl(cmd, argp);
1420                 break;
1421         case SIOCX25GSUBSCRIP:
1422                 rc = x25_subscr_ioctl(cmd, argp);
1423                 break;
1424         case SIOCX25SSUBSCRIP:
1425                 rc = -EPERM;
1426                 if (!capable(CAP_NET_ADMIN))
1427                         break;
1428                 rc = x25_subscr_ioctl(cmd, argp);
1429                 break;
1430         case SIOCX25GFACILITIES: {
1431                 lock_sock(sk);
1432                 rc = copy_to_user(argp, &x25->facilities,
1433                                   sizeof(x25->facilities))
1434                         ? -EFAULT : 0;
1435                 release_sock(sk);
1436                 break;
1437         }
1438 
1439         case SIOCX25SFACILITIES: {
1440                 struct x25_facilities facilities;
1441                 rc = -EFAULT;
1442                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1443                         break;
1444                 rc = -EINVAL;
1445                 lock_sock(sk);
1446                 if (sk->sk_state != TCP_LISTEN &&
1447                     sk->sk_state != TCP_CLOSE)
1448                         goto out_fac_release;
1449                 if (facilities.pacsize_in < X25_PS16 ||
1450                     facilities.pacsize_in > X25_PS4096)
1451                         goto out_fac_release;
1452                 if (facilities.pacsize_out < X25_PS16 ||
1453                     facilities.pacsize_out > X25_PS4096)
1454                         goto out_fac_release;
1455                 if (facilities.winsize_in < 1 ||
1456                     facilities.winsize_in > 127)
1457                         goto out_fac_release;
1458                 if (facilities.throughput) {
1459                         int out = facilities.throughput & 0xf0;
1460                         int in  = facilities.throughput & 0x0f;
1461                         if (!out)
1462                                 facilities.throughput |=
1463                                         X25_DEFAULT_THROUGHPUT << 4;
1464                         else if (out < 0x30 || out > 0xD0)
1465                                 goto out_fac_release;
1466                         if (!in)
1467                                 facilities.throughput |=
1468                                         X25_DEFAULT_THROUGHPUT;
1469                         else if (in < 0x03 || in > 0x0D)
1470                                 goto out_fac_release;
1471                 }
1472                 if (facilities.reverse &&
1473                     (facilities.reverse & 0x81) != 0x81)
1474                         goto out_fac_release;
1475                 x25->facilities = facilities;
1476                 rc = 0;
1477 out_fac_release:
1478                 release_sock(sk);
1479                 break;
1480         }
1481 
1482         case SIOCX25GDTEFACILITIES: {
1483                 lock_sock(sk);
1484                 rc = copy_to_user(argp, &x25->dte_facilities,
1485                                   sizeof(x25->dte_facilities));
1486                 release_sock(sk);
1487                 if (rc)
1488                         rc = -EFAULT;
1489                 break;
1490         }
1491 
1492         case SIOCX25SDTEFACILITIES: {
1493                 struct x25_dte_facilities dtefacs;
1494                 rc = -EFAULT;
1495                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1496                         break;
1497                 rc = -EINVAL;
1498                 lock_sock(sk);
1499                 if (sk->sk_state != TCP_LISTEN &&
1500                     sk->sk_state != TCP_CLOSE)
1501                         goto out_dtefac_release;
1502                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1503                         goto out_dtefac_release;
1504                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1505                         goto out_dtefac_release;
1506                 x25->dte_facilities = dtefacs;
1507                 rc = 0;
1508 out_dtefac_release:
1509                 release_sock(sk);
1510                 break;
1511         }
1512 
1513         case SIOCX25GCALLUSERDATA: {
1514                 lock_sock(sk);
1515                 rc = copy_to_user(argp, &x25->calluserdata,
1516                                   sizeof(x25->calluserdata))
1517                         ? -EFAULT : 0;
1518                 release_sock(sk);
1519                 break;
1520         }
1521 
1522         case SIOCX25SCALLUSERDATA: {
1523                 struct x25_calluserdata calluserdata;
1524 
1525                 rc = -EFAULT;
1526                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1527                         break;
1528                 rc = -EINVAL;
1529                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1530                         break;
1531                 lock_sock(sk);
1532                 x25->calluserdata = calluserdata;
1533                 release_sock(sk);
1534                 rc = 0;
1535                 break;
1536         }
1537 
1538         case SIOCX25GCAUSEDIAG: {
1539                 lock_sock(sk);
1540                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1541                         ? -EFAULT : 0;
1542                 release_sock(sk);
1543                 break;
1544         }
1545 
1546         case SIOCX25SCAUSEDIAG: {
1547                 struct x25_causediag causediag;
1548                 rc = -EFAULT;
1549                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1550                         break;
1551                 lock_sock(sk);
1552                 x25->causediag = causediag;
1553                 release_sock(sk);
1554                 rc = 0;
1555                 break;
1556 
1557         }
1558 
1559         case SIOCX25SCUDMATCHLEN: {
1560                 struct x25_subaddr sub_addr;
1561                 rc = -EINVAL;
1562                 lock_sock(sk);
1563                 if(sk->sk_state != TCP_CLOSE)
1564                         goto out_cud_release;
1565                 rc = -EFAULT;
1566                 if (copy_from_user(&sub_addr, argp,
1567                                    sizeof(sub_addr)))
1568                         goto out_cud_release;
1569                 rc = -EINVAL;
1570                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1571                         goto out_cud_release;
1572                 x25->cudmatchlength = sub_addr.cudmatchlength;
1573                 rc = 0;
1574 out_cud_release:
1575                 release_sock(sk);
1576                 break;
1577         }
1578 
1579         case SIOCX25CALLACCPTAPPRV: {
1580                 rc = -EINVAL;
1581                 lock_sock(sk);
1582                 if (sk->sk_state == TCP_CLOSE) {
1583                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1584                         rc = 0;
1585                 }
1586                 release_sock(sk);
1587                 break;
1588         }
1589 
1590         case SIOCX25SENDCALLACCPT:  {
1591                 rc = -EINVAL;
1592                 lock_sock(sk);
1593                 if (sk->sk_state != TCP_ESTABLISHED)
1594                         goto out_sendcallaccpt_release;
1595                 /* must call accptapprv above */
1596                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1597                         goto out_sendcallaccpt_release;
1598                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1599                 x25->state = X25_STATE_3;
1600                 rc = 0;
1601 out_sendcallaccpt_release:
1602                 release_sock(sk);
1603                 break;
1604         }
1605 
1606         default:
1607                 rc = -ENOIOCTLCMD;
1608                 break;
1609         }
1610 
1611         return rc;
1612 }
1613 
1614 static const struct net_proto_family x25_family_ops = {
1615         .family =       AF_X25,
1616         .create =       x25_create,
1617         .owner  =       THIS_MODULE,
1618 };
1619 
1620 #ifdef CONFIG_COMPAT
1621 static int compat_x25_subscr_ioctl(unsigned int cmd,
1622                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1623 {
1624         struct compat_x25_subscrip_struct x25_subscr;
1625         struct x25_neigh *nb;
1626         struct net_device *dev;
1627         int rc = -EINVAL;
1628 
1629         rc = -EFAULT;
1630         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1631                 goto out;
1632 
1633         rc = -EINVAL;
1634         dev = x25_dev_get(x25_subscr.device);
1635         if (dev == NULL)
1636                 goto out;
1637 
1638         nb = x25_get_neigh(dev);
1639         if (nb == NULL)
1640                 goto out_dev_put;
1641 
1642         dev_put(dev);
1643 
1644         if (cmd == SIOCX25GSUBSCRIP) {
1645                 read_lock_bh(&x25_neigh_list_lock);
1646                 x25_subscr.extended = nb->extended;
1647                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1648                 read_unlock_bh(&x25_neigh_list_lock);
1649                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1650                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1651         } else {
1652                 rc = -EINVAL;
1653                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1654                         rc = 0;
1655                         write_lock_bh(&x25_neigh_list_lock);
1656                         nb->extended = x25_subscr.extended;
1657                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1658                         write_unlock_bh(&x25_neigh_list_lock);
1659                 }
1660         }
1661         x25_neigh_put(nb);
1662 out:
1663         return rc;
1664 out_dev_put:
1665         dev_put(dev);
1666         goto out;
1667 }
1668 
1669 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1670                                 unsigned long arg)
1671 {
1672         void __user *argp = compat_ptr(arg);
1673         struct sock *sk = sock->sk;
1674 
1675         int rc = -ENOIOCTLCMD;
1676 
1677         switch(cmd) {
1678         case TIOCOUTQ:
1679         case TIOCINQ:
1680                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1681                 break;
1682         case SIOCGSTAMP:
1683                 rc = -EINVAL;
1684                 if (sk)
1685                         rc = compat_sock_get_timestamp(sk,
1686                                         (struct timeval __user*)argp);
1687                 break;
1688         case SIOCGSTAMPNS:
1689                 rc = -EINVAL;
1690                 if (sk)
1691                         rc = compat_sock_get_timestampns(sk,
1692                                         (struct timespec __user*)argp);
1693                 break;
1694         case SIOCGIFADDR:
1695         case SIOCSIFADDR:
1696         case SIOCGIFDSTADDR:
1697         case SIOCSIFDSTADDR:
1698         case SIOCGIFBRDADDR:
1699         case SIOCSIFBRDADDR:
1700         case SIOCGIFNETMASK:
1701         case SIOCSIFNETMASK:
1702         case SIOCGIFMETRIC:
1703         case SIOCSIFMETRIC:
1704                 rc = -EINVAL;
1705                 break;
1706         case SIOCADDRT:
1707         case SIOCDELRT:
1708                 rc = -EPERM;
1709                 if (!capable(CAP_NET_ADMIN))
1710                         break;
1711                 rc = x25_route_ioctl(cmd, argp);
1712                 break;
1713         case SIOCX25GSUBSCRIP:
1714                 rc = compat_x25_subscr_ioctl(cmd, argp);
1715                 break;
1716         case SIOCX25SSUBSCRIP:
1717                 rc = -EPERM;
1718                 if (!capable(CAP_NET_ADMIN))
1719                         break;
1720                 rc = compat_x25_subscr_ioctl(cmd, argp);
1721                 break;
1722         case SIOCX25GFACILITIES:
1723         case SIOCX25SFACILITIES:
1724         case SIOCX25GDTEFACILITIES:
1725         case SIOCX25SDTEFACILITIES:
1726         case SIOCX25GCALLUSERDATA:
1727         case SIOCX25SCALLUSERDATA:
1728         case SIOCX25GCAUSEDIAG:
1729         case SIOCX25SCAUSEDIAG:
1730         case SIOCX25SCUDMATCHLEN:
1731         case SIOCX25CALLACCPTAPPRV:
1732         case SIOCX25SENDCALLACCPT:
1733                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1734                 break;
1735         default:
1736                 rc = -ENOIOCTLCMD;
1737                 break;
1738         }
1739         return rc;
1740 }
1741 #endif
1742 
1743 static const struct proto_ops x25_proto_ops = {
1744         .family =       AF_X25,
1745         .owner =        THIS_MODULE,
1746         .release =      x25_release,
1747         .bind =         x25_bind,
1748         .connect =      x25_connect,
1749         .socketpair =   sock_no_socketpair,
1750         .accept =       x25_accept,
1751         .getname =      x25_getname,
1752         .poll =         datagram_poll,
1753         .ioctl =        x25_ioctl,
1754 #ifdef CONFIG_COMPAT
1755         .compat_ioctl = compat_x25_ioctl,
1756 #endif
1757         .listen =       x25_listen,
1758         .shutdown =     sock_no_shutdown,
1759         .setsockopt =   x25_setsockopt,
1760         .getsockopt =   x25_getsockopt,
1761         .sendmsg =      x25_sendmsg,
1762         .recvmsg =      x25_recvmsg,
1763         .mmap =         sock_no_mmap,
1764         .sendpage =     sock_no_sendpage,
1765 };
1766 
1767 static struct packet_type x25_packet_type __read_mostly = {
1768         .type = cpu_to_be16(ETH_P_X25),
1769         .func = x25_lapb_receive_frame,
1770 };
1771 
1772 static struct notifier_block x25_dev_notifier = {
1773         .notifier_call = x25_device_event,
1774 };
1775 
1776 void x25_kill_by_neigh(struct x25_neigh *nb)
1777 {
1778         struct sock *s;
1779 
1780         write_lock_bh(&x25_list_lock);
1781 
1782         sk_for_each(s, &x25_list)
1783                 if (x25_sk(s)->neighbour == nb)
1784                         x25_disconnect(s, ENETUNREACH, 0, 0);
1785 
1786         write_unlock_bh(&x25_list_lock);
1787 
1788         /* Remove any related forwards */
1789         x25_clear_forward_by_dev(nb->dev);
1790 }
1791 
1792 static int __init x25_init(void)
1793 {
1794         int rc;
1795 
1796         rc = proto_register(&x25_proto, 0);
1797         if (rc)
1798                 goto out;
1799 
1800         rc = sock_register(&x25_family_ops);
1801         if (rc)
1802                 goto out_proto;
1803 
1804         dev_add_pack(&x25_packet_type);
1805 
1806         rc = register_netdevice_notifier(&x25_dev_notifier);
1807         if (rc)
1808                 goto out_sock;
1809 
1810         rc = x25_register_sysctl();
1811         if (rc)
1812                 goto out_dev;
1813 
1814         rc = x25_proc_init();
1815         if (rc)
1816                 goto out_sysctl;
1817 
1818         pr_info("Linux Version 0.2\n");
1819 
1820 out:
1821         return rc;
1822 out_sysctl:
1823         x25_unregister_sysctl();
1824 out_dev:
1825         unregister_netdevice_notifier(&x25_dev_notifier);
1826 out_sock:
1827         dev_remove_pack(&x25_packet_type);
1828         sock_unregister(AF_X25);
1829 out_proto:
1830         proto_unregister(&x25_proto);
1831         goto out;
1832 }
1833 module_init(x25_init);
1834 
1835 static void __exit x25_exit(void)
1836 {
1837         x25_proc_exit();
1838         x25_link_free();
1839         x25_route_free();
1840 
1841         x25_unregister_sysctl();
1842 
1843         unregister_netdevice_notifier(&x25_dev_notifier);
1844 
1845         dev_remove_pack(&x25_packet_type);
1846 
1847         sock_unregister(AF_X25);
1848         proto_unregister(&x25_proto);
1849 }
1850 module_exit(x25_exit);
1851 
1852 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1853 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1854 MODULE_LICENSE("GPL");
1855 MODULE_ALIAS_NETPROTO(PF_X25);
1856 

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