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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(struct timer_list *t)
378 {
379         struct sock *sk = from_timer(sk, t, sk_timer);
380 
381         x25_destroy_socket_from_timer(sk);
382 }
383 
384 /*
385  *      This is called from user mode and the timers. Thus it protects itself
386  *      against interrupt users but doesn't worry about being called during
387  *      work. Once it is removed from the queue no interrupt or bottom half
388  *      will touch it and we are (fairly 8-) ) safe.
389  *      Not static as it's used by the timer
390  */
391 static void __x25_destroy_socket(struct sock *sk)
392 {
393         struct sk_buff *skb;
394 
395         x25_stop_heartbeat(sk);
396         x25_stop_timer(sk);
397 
398         x25_remove_socket(sk);
399         x25_clear_queues(sk);           /* Flush the queues */
400 
401         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
402                 if (skb->sk != sk) {            /* A pending connection */
403                         /*
404                          * Queue the unaccepted socket for death
405                          */
406                         skb->sk->sk_state = TCP_LISTEN;
407                         sock_set_flag(skb->sk, SOCK_DEAD);
408                         x25_start_heartbeat(skb->sk);
409                         x25_sk(skb->sk)->state = X25_STATE_0;
410                 }
411 
412                 kfree_skb(skb);
413         }
414 
415         if (sk_has_allocations(sk)) {
416                 /* Defer: outstanding buffers */
417                 sk->sk_timer.expires  = jiffies + 10 * HZ;
418                 sk->sk_timer.function = x25_destroy_timer;
419                 add_timer(&sk->sk_timer);
420         } else {
421                 /* drop last reference so sock_put will free */
422                 __sock_put(sk);
423         }
424 }
425 
426 void x25_destroy_socket_from_timer(struct sock *sk)
427 {
428         sock_hold(sk);
429         bh_lock_sock(sk);
430         __x25_destroy_socket(sk);
431         bh_unlock_sock(sk);
432         sock_put(sk);
433 }
434 
435 /*
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);
504                 sk->sk_max_ack_backlog = backlog;
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, int kern)
520 {
521         struct x25_sock *x25;
522         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
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, kern)) == 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;
568         sk->sk_backlog_rcv = x25_backlog_rcv;
569 
570         x25->t21   = sysctl_x25_call_request_timeout;
571         x25->t22   = sysctl_x25_reset_request_timeout;
572         x25->t23   = sysctl_x25_clear_request_timeout;
573         x25->t2    = sysctl_x25_ack_holdback_timeout;
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), 0)) == 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 
630         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
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);
660                         x25_write_internal(sk, X25_CLEAR_REQUEST);
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 {
711         DECLARE_WAITQUEUE(wait, current);
712         int rc;
713 
714         add_wait_queue_exclusive(sk_sleep(sk), &wait);
715         for (;;) {
716                 __set_current_state(TASK_INTERRUPTIBLE);
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         }
733         __set_current_state(TASK_RUNNING);
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 
780         x25_limit_facilities(&x25->facilities, x25->neighbour);
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 
801         x25_write_internal(sk, X25_CALL_REQUEST);
802 
803         x25_start_heartbeat(sk);
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 {
829         DECLARE_WAITQUEUE(wait, current);
830         int rc = 0;
831 
832         add_wait_queue_exclusive(sk_sleep(sk), &wait);
833         for (;;) {
834                 __set_current_state(TASK_INTERRUPTIBLE);
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         }
851         __set_current_state(TASK_RUNNING);
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                       bool kern)
858 {
859         struct sock *sk = sock->sk;
860         struct sock *newsk;
861         struct sk_buff *skb;
862         int rc = -EINVAL;
863 
864         if (!sk)
865                 goto out;
866 
867         rc = -EOPNOTSUPP;
868         if (sk->sk_type != SOCK_SEQPACKET)
869                 goto out;
870 
871         lock_sock(sk);
872         rc = -EINVAL;
873         if (sk->sk_state != TCP_LISTEN)
874                 goto out2;
875 
876         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
877         if (rc)
878                 goto out2;
879         skb = skb_dequeue(&sk->sk_receive_queue);
880         rc = -EINVAL;
881         if (!skb->sk)
882                 goto out2;
883         newsk            = skb->sk;
884         sock_graft(newsk, newsock);
885 
886         /* Now attach up the new socket */
887         skb->sk = NULL;
888         kfree_skb(skb);
889         sk->sk_ack_backlog--;
890         newsock->state = SS_CONNECTED;
891         rc = 0;
892 out2:
893         release_sock(sk);
894 out:
895         return rc;
896 }
897 
898 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
899                        int peer)
900 {
901         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
902         struct sock *sk = sock->sk;
903         struct x25_sock *x25 = x25_sk(sk);
904         int rc = 0;
905 
906         if (peer) {
907                 if (sk->sk_state != TCP_ESTABLISHED) {
908                         rc = -ENOTCONN;
909                         goto out;
910                 }
911                 sx25->sx25_addr = x25->dest_addr;
912         } else
913                 sx25->sx25_addr = x25->source_addr;
914 
915         sx25->sx25_family = AF_X25;
916         rc = sizeof(*sx25);
917 
918 out:
919         return rc;
920 }
921 
922 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
923                         unsigned int lci)
924 {
925         struct sock *sk;
926         struct sock *make;
927         struct x25_sock *makex25;
928         struct x25_address source_addr, dest_addr;
929         struct x25_facilities facilities;
930         struct x25_dte_facilities dte_facilities;
931         int len, addr_len, rc;
932 
933         /*
934          *      Remove the LCI and frame type.
935          */
936         skb_pull(skb, X25_STD_MIN_LEN);
937 
938         /*
939          *      Extract the X.25 addresses and convert them to ASCII strings,
940          *      and remove them.
941          *
942          *      Address block is mandatory in call request packets
943          */
944         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
945         if (addr_len <= 0)
946                 goto out_clear_request;
947         skb_pull(skb, addr_len);
948 
949         /*
950          *      Get the length of the facilities, skip past them for the moment
951          *      get the call user data because this is needed to determine
952          *      the correct listener
953          *
954          *      Facilities length is mandatory in call request packets
955          */
956         if (!pskb_may_pull(skb, 1))
957                 goto out_clear_request;
958         len = skb->data[0] + 1;
959         if (!pskb_may_pull(skb, len))
960                 goto out_clear_request;
961         skb_pull(skb,len);
962 
963         /*
964          *      Ensure that the amount of call user data is valid.
965          */
966         if (skb->len > X25_MAX_CUD_LEN)
967                 goto out_clear_request;
968 
969         /*
970          *      Get all the call user data so it can be used in
971          *      x25_find_listener and skb_copy_from_linear_data up ahead.
972          */
973         if (!pskb_may_pull(skb, skb->len))
974                 goto out_clear_request;
975 
976         /*
977          *      Find a listener for the particular address/cud pair.
978          */
979         sk = x25_find_listener(&source_addr,skb);
980         skb_push(skb,len);
981 
982         if (sk != NULL && sk_acceptq_is_full(sk)) {
983                 goto out_sock_put;
984         }
985 
986         /*
987          *      We dont have any listeners for this incoming call.
988          *      Try forwarding it.
989          */
990         if (sk == NULL) {
991                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
992                 if (sysctl_x25_forward &&
993                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
994                 {
995                         /* Call was forwarded, dont process it any more */
996                         kfree_skb(skb);
997                         rc = 1;
998                         goto out;
999                 } else {
1000                         /* No listeners, can't forward, clear the call */
1001                         goto out_clear_request;
1002                 }
1003         }
1004 
1005         /*
1006          *      Try to reach a compromise on the requested facilities.
1007          */
1008         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1009         if (len == -1)
1010                 goto out_sock_put;
1011 
1012         /*
1013          * current neighbour/link might impose additional limits
1014          * on certain facilties
1015          */
1016 
1017         x25_limit_facilities(&facilities, nb);
1018 
1019         /*
1020          *      Try to create a new socket.
1021          */
1022         make = x25_make_new(sk);
1023         if (!make)
1024                 goto out_sock_put;
1025 
1026         /*
1027          *      Remove the facilities
1028          */
1029         skb_pull(skb, len);
1030 
1031         skb->sk     = make;
1032         make->sk_state = TCP_ESTABLISHED;
1033 
1034         makex25 = x25_sk(make);
1035         makex25->lci           = lci;
1036         makex25->dest_addr     = dest_addr;
1037         makex25->source_addr   = source_addr;
1038         makex25->neighbour     = nb;
1039         makex25->facilities    = facilities;
1040         makex25->dte_facilities= dte_facilities;
1041         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1042         /* ensure no reverse facil on accept */
1043         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1044         /* ensure no calling address extension on accept */
1045         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1046         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1047 
1048         /* Normally all calls are accepted immediately */
1049         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1050                 x25_write_internal(make, X25_CALL_ACCEPTED);
1051                 makex25->state = X25_STATE_3;
1052         }
1053 
1054         /*
1055          *      Incoming Call User Data.
1056          */
1057         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1058         makex25->calluserdata.cudlength = skb->len;
1059 
1060         sk->sk_ack_backlog++;
1061 
1062         x25_insert_socket(make);
1063 
1064         skb_queue_head(&sk->sk_receive_queue, skb);
1065 
1066         x25_start_heartbeat(make);
1067 
1068         if (!sock_flag(sk, SOCK_DEAD))
1069                 sk->sk_data_ready(sk);
1070         rc = 1;
1071         sock_put(sk);
1072 out:
1073         return rc;
1074 out_sock_put:
1075         sock_put(sk);
1076 out_clear_request:
1077         rc = 0;
1078         x25_transmit_clear_request(nb, lci, 0x01);
1079         goto out;
1080 }
1081 
1082 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1083 {
1084         struct sock *sk = sock->sk;
1085         struct x25_sock *x25 = x25_sk(sk);
1086         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, 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);
1095         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
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 
1155         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
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_from_msg(skb_transport_header(skb), msg, 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 socket *sock, struct msghdr *msg, size_t size,
1257                        int flags)
1258 {
1259         struct sock *sk = sock->sk;
1260         struct x25_sock *x25 = x25_sk(sk);
1261         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1262         size_t copied;
1263         int qbit, header_len;
1264         struct sk_buff *skb;
1265         unsigned char *asmptr;
1266         int rc = -ENOTCONN;
1267 
1268         lock_sock(sk);
1269 
1270         if (x25->neighbour == NULL)
1271                 goto out;
1272 
1273         header_len = x25->neighbour->extended ?
1274                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1275 
1276         /*
1277          * This works for seqpacket too. The receiver has ordered the queue for
1278          * us! We do one quick check first though
1279          */
1280         if (sk->sk_state != TCP_ESTABLISHED)
1281                 goto out;
1282 
1283         if (flags & MSG_OOB) {
1284                 rc = -EINVAL;
1285                 if (sock_flag(sk, SOCK_URGINLINE) ||
1286                     !skb_peek(&x25->interrupt_in_queue))
1287                         goto out;
1288 
1289                 skb = skb_dequeue(&x25->interrupt_in_queue);
1290 
1291                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1292                         goto out_free_dgram;
1293 
1294                 skb_pull(skb, X25_STD_MIN_LEN);
1295 
1296                 /*
1297                  *      No Q bit information on Interrupt data.
1298                  */
1299                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1300                         asmptr  = skb_push(skb, 1);
1301                         *asmptr = 0x00;
1302                 }
1303 
1304                 msg->msg_flags |= MSG_OOB;
1305         } else {
1306                 /* Now we can treat all alike */
1307                 release_sock(sk);
1308                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1309                                         flags & MSG_DONTWAIT, &rc);
1310                 lock_sock(sk);
1311                 if (!skb)
1312                         goto out;
1313 
1314                 if (!pskb_may_pull(skb, header_len))
1315                         goto out_free_dgram;
1316 
1317                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1318 
1319                 skb_pull(skb, header_len);
1320 
1321                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1322                         asmptr  = skb_push(skb, 1);
1323                         *asmptr = qbit;
1324                 }
1325         }
1326 
1327         skb_reset_transport_header(skb);
1328         copied = skb->len;
1329 
1330         if (copied > size) {
1331                 copied = size;
1332                 msg->msg_flags |= MSG_TRUNC;
1333         }
1334 
1335         /* Currently, each datagram always contains a complete record */
1336         msg->msg_flags |= MSG_EOR;
1337 
1338         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1339         if (rc)
1340                 goto out_free_dgram;
1341 
1342         if (sx25) {
1343                 sx25->sx25_family = AF_X25;
1344                 sx25->sx25_addr   = x25->dest_addr;
1345                 msg->msg_namelen = sizeof(*sx25);
1346         }
1347 
1348         x25_check_rbuf(sk);
1349         rc = copied;
1350 out_free_dgram:
1351         skb_free_datagram(sk, skb);
1352 out:
1353         release_sock(sk);
1354         return rc;
1355 }
1356 
1357 
1358 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1359 {
1360         struct sock *sk = sock->sk;
1361         struct x25_sock *x25 = x25_sk(sk);
1362         void __user *argp = (void __user *)arg;
1363         int rc;
1364 
1365         switch (cmd) {
1366         case TIOCOUTQ: {
1367                 int amount;
1368 
1369                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1370                 if (amount < 0)
1371                         amount = 0;
1372                 rc = put_user(amount, (unsigned int __user *)argp);
1373                 break;
1374         }
1375 
1376         case TIOCINQ: {
1377                 struct sk_buff *skb;
1378                 int amount = 0;
1379                 /*
1380                  * These two are safe on a single CPU system as
1381                  * only user tasks fiddle here
1382                  */
1383                 lock_sock(sk);
1384                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1385                         amount = skb->len;
1386                 release_sock(sk);
1387                 rc = put_user(amount, (unsigned int __user *)argp);
1388                 break;
1389         }
1390 
1391         case SIOCGSTAMP:
1392                 rc = -EINVAL;
1393                 if (sk)
1394                         rc = sock_get_timestamp(sk,
1395                                                 (struct timeval __user *)argp);
1396                 break;
1397         case SIOCGSTAMPNS:
1398                 rc = -EINVAL;
1399                 if (sk)
1400                         rc = sock_get_timestampns(sk,
1401                                         (struct timespec __user *)argp);
1402                 break;
1403         case SIOCGIFADDR:
1404         case SIOCSIFADDR:
1405         case SIOCGIFDSTADDR:
1406         case SIOCSIFDSTADDR:
1407         case SIOCGIFBRDADDR:
1408         case SIOCSIFBRDADDR:
1409         case SIOCGIFNETMASK:
1410         case SIOCSIFNETMASK:
1411         case SIOCGIFMETRIC:
1412         case SIOCSIFMETRIC:
1413                 rc = -EINVAL;
1414                 break;
1415         case SIOCADDRT:
1416         case SIOCDELRT:
1417                 rc = -EPERM;
1418                 if (!capable(CAP_NET_ADMIN))
1419                         break;
1420                 rc = x25_route_ioctl(cmd, argp);
1421                 break;
1422         case SIOCX25GSUBSCRIP:
1423                 rc = x25_subscr_ioctl(cmd, argp);
1424                 break;
1425         case SIOCX25SSUBSCRIP:
1426                 rc = -EPERM;
1427                 if (!capable(CAP_NET_ADMIN))
1428                         break;
1429                 rc = x25_subscr_ioctl(cmd, argp);
1430                 break;
1431         case SIOCX25GFACILITIES: {
1432                 lock_sock(sk);
1433                 rc = copy_to_user(argp, &x25->facilities,
1434                                   sizeof(x25->facilities))
1435                         ? -EFAULT : 0;
1436                 release_sock(sk);
1437                 break;
1438         }
1439 
1440         case SIOCX25SFACILITIES: {
1441                 struct x25_facilities facilities;
1442                 rc = -EFAULT;
1443                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1444                         break;
1445                 rc = -EINVAL;
1446                 lock_sock(sk);
1447                 if (sk->sk_state != TCP_LISTEN &&
1448                     sk->sk_state != TCP_CLOSE)
1449                         goto out_fac_release;
1450                 if (facilities.pacsize_in < X25_PS16 ||
1451                     facilities.pacsize_in > X25_PS4096)
1452                         goto out_fac_release;
1453                 if (facilities.pacsize_out < X25_PS16 ||
1454                     facilities.pacsize_out > X25_PS4096)
1455                         goto out_fac_release;
1456                 if (facilities.winsize_in < 1 ||
1457                     facilities.winsize_in > 127)
1458                         goto out_fac_release;
1459                 if (facilities.throughput) {
1460                         int out = facilities.throughput & 0xf0;
1461                         int in  = facilities.throughput & 0x0f;
1462                         if (!out)
1463                                 facilities.throughput |=
1464                                         X25_DEFAULT_THROUGHPUT << 4;
1465                         else if (out < 0x30 || out > 0xD0)
1466                                 goto out_fac_release;
1467                         if (!in)
1468                                 facilities.throughput |=
1469                                         X25_DEFAULT_THROUGHPUT;
1470                         else if (in < 0x03 || in > 0x0D)
1471                                 goto out_fac_release;
1472                 }
1473                 if (facilities.reverse &&
1474                     (facilities.reverse & 0x81) != 0x81)
1475                         goto out_fac_release;
1476                 x25->facilities = facilities;
1477                 rc = 0;
1478 out_fac_release:
1479                 release_sock(sk);
1480                 break;
1481         }
1482 
1483         case SIOCX25GDTEFACILITIES: {
1484                 lock_sock(sk);
1485                 rc = copy_to_user(argp, &x25->dte_facilities,
1486                                   sizeof(x25->dte_facilities));
1487                 release_sock(sk);
1488                 if (rc)
1489                         rc = -EFAULT;
1490                 break;
1491         }
1492 
1493         case SIOCX25SDTEFACILITIES: {
1494                 struct x25_dte_facilities dtefacs;
1495                 rc = -EFAULT;
1496                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1497                         break;
1498                 rc = -EINVAL;
1499                 lock_sock(sk);
1500                 if (sk->sk_state != TCP_LISTEN &&
1501                     sk->sk_state != TCP_CLOSE)
1502                         goto out_dtefac_release;
1503                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1504                         goto out_dtefac_release;
1505                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1506                         goto out_dtefac_release;
1507                 x25->dte_facilities = dtefacs;
1508                 rc = 0;
1509 out_dtefac_release:
1510                 release_sock(sk);
1511                 break;
1512         }
1513 
1514         case SIOCX25GCALLUSERDATA: {
1515                 lock_sock(sk);
1516                 rc = copy_to_user(argp, &x25->calluserdata,
1517                                   sizeof(x25->calluserdata))
1518                         ? -EFAULT : 0;
1519                 release_sock(sk);
1520                 break;
1521         }
1522 
1523         case SIOCX25SCALLUSERDATA: {
1524                 struct x25_calluserdata calluserdata;
1525 
1526                 rc = -EFAULT;
1527                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1528                         break;
1529                 rc = -EINVAL;
1530                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1531                         break;
1532                 lock_sock(sk);
1533                 x25->calluserdata = calluserdata;
1534                 release_sock(sk);
1535                 rc = 0;
1536                 break;
1537         }
1538 
1539         case SIOCX25GCAUSEDIAG: {
1540                 lock_sock(sk);
1541                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1542                         ? -EFAULT : 0;
1543                 release_sock(sk);
1544                 break;
1545         }
1546 
1547         case SIOCX25SCAUSEDIAG: {
1548                 struct x25_causediag causediag;
1549                 rc = -EFAULT;
1550                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1551                         break;
1552                 lock_sock(sk);
1553                 x25->causediag = causediag;
1554                 release_sock(sk);
1555                 rc = 0;
1556                 break;
1557 
1558         }
1559 
1560         case SIOCX25SCUDMATCHLEN: {
1561                 struct x25_subaddr sub_addr;
1562                 rc = -EINVAL;
1563                 lock_sock(sk);
1564                 if(sk->sk_state != TCP_CLOSE)
1565                         goto out_cud_release;
1566                 rc = -EFAULT;
1567                 if (copy_from_user(&sub_addr, argp,
1568                                    sizeof(sub_addr)))
1569                         goto out_cud_release;
1570                 rc = -EINVAL;
1571                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1572                         goto out_cud_release;
1573                 x25->cudmatchlength = sub_addr.cudmatchlength;
1574                 rc = 0;
1575 out_cud_release:
1576                 release_sock(sk);
1577                 break;
1578         }
1579 
1580         case SIOCX25CALLACCPTAPPRV: {
1581                 rc = -EINVAL;
1582                 lock_sock(sk);
1583                 if (sk->sk_state == TCP_CLOSE) {
1584                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1585                         rc = 0;
1586                 }
1587                 release_sock(sk);
1588                 break;
1589         }
1590 
1591         case SIOCX25SENDCALLACCPT:  {
1592                 rc = -EINVAL;
1593                 lock_sock(sk);
1594                 if (sk->sk_state != TCP_ESTABLISHED)
1595                         goto out_sendcallaccpt_release;
1596                 /* must call accptapprv above */
1597                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1598                         goto out_sendcallaccpt_release;
1599                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1600                 x25->state = X25_STATE_3;
1601                 rc = 0;
1602 out_sendcallaccpt_release:
1603                 release_sock(sk);
1604                 break;
1605         }
1606 
1607         default:
1608                 rc = -ENOIOCTLCMD;
1609                 break;
1610         }
1611 
1612         return rc;
1613 }
1614 
1615 static const struct net_proto_family x25_family_ops = {
1616         .family =       AF_X25,
1617         .create =       x25_create,
1618         .owner  =       THIS_MODULE,
1619 };
1620 
1621 #ifdef CONFIG_COMPAT
1622 static int compat_x25_subscr_ioctl(unsigned int cmd,
1623                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1624 {
1625         struct compat_x25_subscrip_struct x25_subscr;
1626         struct x25_neigh *nb;
1627         struct net_device *dev;
1628         int rc = -EINVAL;
1629 
1630         rc = -EFAULT;
1631         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1632                 goto out;
1633 
1634         rc = -EINVAL;
1635         dev = x25_dev_get(x25_subscr.device);
1636         if (dev == NULL)
1637                 goto out;
1638 
1639         nb = x25_get_neigh(dev);
1640         if (nb == NULL)
1641                 goto out_dev_put;
1642 
1643         dev_put(dev);
1644 
1645         if (cmd == SIOCX25GSUBSCRIP) {
1646                 read_lock_bh(&x25_neigh_list_lock);
1647                 x25_subscr.extended = nb->extended;
1648                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1649                 read_unlock_bh(&x25_neigh_list_lock);
1650                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1651                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1652         } else {
1653                 rc = -EINVAL;
1654                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1655                         rc = 0;
1656                         write_lock_bh(&x25_neigh_list_lock);
1657                         nb->extended = x25_subscr.extended;
1658                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1659                         write_unlock_bh(&x25_neigh_list_lock);
1660                 }
1661         }
1662         x25_neigh_put(nb);
1663 out:
1664         return rc;
1665 out_dev_put:
1666         dev_put(dev);
1667         goto out;
1668 }
1669 
1670 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1671                                 unsigned long arg)
1672 {
1673         void __user *argp = compat_ptr(arg);
1674         struct sock *sk = sock->sk;
1675 
1676         int rc = -ENOIOCTLCMD;
1677 
1678         switch(cmd) {
1679         case TIOCOUTQ:
1680         case TIOCINQ:
1681                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1682                 break;
1683         case SIOCGSTAMP:
1684                 rc = -EINVAL;
1685                 if (sk)
1686                         rc = compat_sock_get_timestamp(sk,
1687                                         (struct timeval __user*)argp);
1688                 break;
1689         case SIOCGSTAMPNS:
1690                 rc = -EINVAL;
1691                 if (sk)
1692                         rc = compat_sock_get_timestampns(sk,
1693                                         (struct timespec __user*)argp);
1694                 break;
1695         case SIOCGIFADDR:
1696         case SIOCSIFADDR:
1697         case SIOCGIFDSTADDR:
1698         case SIOCSIFDSTADDR:
1699         case SIOCGIFBRDADDR:
1700         case SIOCSIFBRDADDR:
1701         case SIOCGIFNETMASK:
1702         case SIOCSIFNETMASK:
1703         case SIOCGIFMETRIC:
1704         case SIOCSIFMETRIC:
1705                 rc = -EINVAL;
1706                 break;
1707         case SIOCADDRT:
1708         case SIOCDELRT:
1709                 rc = -EPERM;
1710                 if (!capable(CAP_NET_ADMIN))
1711                         break;
1712                 rc = x25_route_ioctl(cmd, argp);
1713                 break;
1714         case SIOCX25GSUBSCRIP:
1715                 rc = compat_x25_subscr_ioctl(cmd, argp);
1716                 break;
1717         case SIOCX25SSUBSCRIP:
1718                 rc = -EPERM;
1719                 if (!capable(CAP_NET_ADMIN))
1720                         break;
1721                 rc = compat_x25_subscr_ioctl(cmd, argp);
1722                 break;
1723         case SIOCX25GFACILITIES:
1724         case SIOCX25SFACILITIES:
1725         case SIOCX25GDTEFACILITIES:
1726         case SIOCX25SDTEFACILITIES:
1727         case SIOCX25GCALLUSERDATA:
1728         case SIOCX25SCALLUSERDATA:
1729         case SIOCX25GCAUSEDIAG:
1730         case SIOCX25SCAUSEDIAG:
1731         case SIOCX25SCUDMATCHLEN:
1732         case SIOCX25CALLACCPTAPPRV:
1733         case SIOCX25SENDCALLACCPT:
1734                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1735                 break;
1736         default:
1737                 rc = -ENOIOCTLCMD;
1738                 break;
1739         }
1740         return rc;
1741 }
1742 #endif
1743 
1744 static const struct proto_ops x25_proto_ops = {
1745         .family =       AF_X25,
1746         .owner =        THIS_MODULE,
1747         .release =      x25_release,
1748         .bind =         x25_bind,
1749         .connect =      x25_connect,
1750         .socketpair =   sock_no_socketpair,
1751         .accept =       x25_accept,
1752         .getname =      x25_getname,
1753         .poll =         datagram_poll,
1754         .ioctl =        x25_ioctl,
1755 #ifdef CONFIG_COMPAT
1756         .compat_ioctl = compat_x25_ioctl,
1757 #endif
1758         .listen =       x25_listen,
1759         .shutdown =     sock_no_shutdown,
1760         .setsockopt =   x25_setsockopt,
1761         .getsockopt =   x25_getsockopt,
1762         .sendmsg =      x25_sendmsg,
1763         .recvmsg =      x25_recvmsg,
1764         .mmap =         sock_no_mmap,
1765         .sendpage =     sock_no_sendpage,
1766 };
1767 
1768 static struct packet_type x25_packet_type __read_mostly = {
1769         .type = cpu_to_be16(ETH_P_X25),
1770         .func = x25_lapb_receive_frame,
1771 };
1772 
1773 static struct notifier_block x25_dev_notifier = {
1774         .notifier_call = x25_device_event,
1775 };
1776 
1777 void x25_kill_by_neigh(struct x25_neigh *nb)
1778 {
1779         struct sock *s;
1780 
1781         write_lock_bh(&x25_list_lock);
1782 
1783         sk_for_each(s, &x25_list)
1784                 if (x25_sk(s)->neighbour == nb)
1785                         x25_disconnect(s, ENETUNREACH, 0, 0);
1786 
1787         write_unlock_bh(&x25_list_lock);
1788 
1789         /* Remove any related forwards */
1790         x25_clear_forward_by_dev(nb->dev);
1791 }
1792 
1793 static int __init x25_init(void)
1794 {
1795         int rc;
1796 
1797         rc = proto_register(&x25_proto, 0);
1798         if (rc)
1799                 goto out;
1800 
1801         rc = sock_register(&x25_family_ops);
1802         if (rc)
1803                 goto out_proto;
1804 
1805         dev_add_pack(&x25_packet_type);
1806 
1807         rc = register_netdevice_notifier(&x25_dev_notifier);
1808         if (rc)
1809                 goto out_sock;
1810 
1811         rc = x25_register_sysctl();
1812         if (rc)
1813                 goto out_dev;
1814 
1815         rc = x25_proc_init();
1816         if (rc)
1817                 goto out_sysctl;
1818 
1819         pr_info("Linux Version 0.2\n");
1820 
1821 out:
1822         return rc;
1823 out_sysctl:
1824         x25_unregister_sysctl();
1825 out_dev:
1826         unregister_netdevice_notifier(&x25_dev_notifier);
1827 out_sock:
1828         dev_remove_pack(&x25_packet_type);
1829         sock_unregister(AF_X25);
1830 out_proto:
1831         proto_unregister(&x25_proto);
1832         goto out;
1833 }
1834 module_init(x25_init);
1835 
1836 static void __exit x25_exit(void)
1837 {
1838         x25_proc_exit();
1839         x25_link_free();
1840         x25_route_free();
1841 
1842         x25_unregister_sysctl();
1843 
1844         unregister_netdevice_notifier(&x25_dev_notifier);
1845 
1846         dev_remove_pack(&x25_packet_type);
1847 
1848         sock_unregister(AF_X25);
1849         proto_unregister(&x25_proto);
1850 }
1851 module_exit(x25_exit);
1852 
1853 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1854 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1855 MODULE_LICENSE("GPL");
1856 MODULE_ALIAS_NETPROTO(PF_X25);
1857 

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