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Linux/net/x25/af_x25.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *      X.25 Packet Layer release 002
  4  *
  5  *      This is ALPHA test software. This code may break your machine,
  6  *      randomly fail to work with new releases, misbehave and/or generally
  7  *      screw up. It might even work.
  8  *
  9  *      This code REQUIRES 2.1.15 or higher
 10  *
 11  *      History
 12  *      X.25 001        Jonathan Naylor Started coding.
 13  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
 14  *                                      New timer architecture.
 15  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
 16  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
 17  *                                        facilities negotiation and increased
 18  *                                        the throughput upper limit.
 19  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
 20  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
 21  *                                      Fixed x25_output() related skb leakage.
 22  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
 23  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
 24  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
 25  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
 26  *                                      x25_proc.c, using seq_file
 27  *      2005-04-02      Shaun Pereira   Selective sub address matching
 28  *                                      with call user data
 29  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
 30  *                                      response
 31  */
 32 
 33 #define pr_fmt(fmt) "X25: " fmt
 34 
 35 #include <linux/module.h>
 36 #include <linux/capability.h>
 37 #include <linux/errno.h>
 38 #include <linux/kernel.h>
 39 #include <linux/sched/signal.h>
 40 #include <linux/timer.h>
 41 #include <linux/string.h>
 42 #include <linux/net.h>
 43 #include <linux/netdevice.h>
 44 #include <linux/if_arp.h>
 45 #include <linux/skbuff.h>
 46 #include <linux/slab.h>
 47 #include <net/sock.h>
 48 #include <net/tcp_states.h>
 49 #include <linux/uaccess.h>
 50 #include <linux/fcntl.h>
 51 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
 52 #include <linux/notifier.h>
 53 #include <linux/init.h>
 54 #include <linux/compat.h>
 55 #include <linux/ctype.h>
 56 
 57 #include <net/x25.h>
 58 #include <net/compat.h>
 59 
 60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
 61 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
 62 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
 63 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
 64 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
 65 int sysctl_x25_forward                 = 0;
 66 
 67 HLIST_HEAD(x25_list);
 68 DEFINE_RWLOCK(x25_list_lock);
 69 
 70 static const struct proto_ops x25_proto_ops;
 71 
 72 static const struct x25_address null_x25_address = {"               "};
 73 
 74 #ifdef CONFIG_COMPAT
 75 struct compat_x25_subscrip_struct {
 76         char device[200-sizeof(compat_ulong_t)];
 77         compat_ulong_t global_facil_mask;
 78         compat_uint_t extended;
 79 };
 80 #endif
 81 
 82 
 83 int x25_parse_address_block(struct sk_buff *skb,
 84                 struct x25_address *called_addr,
 85                 struct x25_address *calling_addr)
 86 {
 87         unsigned char len;
 88         int needed;
 89         int rc;
 90 
 91         if (!pskb_may_pull(skb, 1)) {
 92                 /* packet has no address block */
 93                 rc = 0;
 94                 goto empty;
 95         }
 96 
 97         len = *skb->data;
 98         needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
 99 
100         if (!pskb_may_pull(skb, needed)) {
101                 /* packet is too short to hold the addresses it claims
102                    to hold */
103                 rc = -1;
104                 goto empty;
105         }
106 
107         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
108 
109 empty:
110         *called_addr->x25_addr = 0;
111         *calling_addr->x25_addr = 0;
112 
113         return rc;
114 }
115 
116 
117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
118                   struct x25_address *calling_addr)
119 {
120         unsigned int called_len, calling_len;
121         char *called, *calling;
122         unsigned int i;
123 
124         called_len  = (*p >> 0) & 0x0F;
125         calling_len = (*p >> 4) & 0x0F;
126 
127         called  = called_addr->x25_addr;
128         calling = calling_addr->x25_addr;
129         p++;
130 
131         for (i = 0; i < (called_len + calling_len); i++) {
132                 if (i < called_len) {
133                         if (i % 2 != 0) {
134                                 *called++ = ((*p >> 0) & 0x0F) + '';
135                                 p++;
136                         } else {
137                                 *called++ = ((*p >> 4) & 0x0F) + '';
138                         }
139                 } else {
140                         if (i % 2 != 0) {
141                                 *calling++ = ((*p >> 0) & 0x0F) + '';
142                                 p++;
143                         } else {
144                                 *calling++ = ((*p >> 4) & 0x0F) + '';
145                         }
146                 }
147         }
148 
149         *called = *calling = '\0';
150 
151         return 1 + (called_len + calling_len + 1) / 2;
152 }
153 
154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
155                   struct x25_address *calling_addr)
156 {
157         unsigned int called_len, calling_len;
158         char *called, *calling;
159         int i;
160 
161         called  = called_addr->x25_addr;
162         calling = calling_addr->x25_addr;
163 
164         called_len  = strlen(called);
165         calling_len = strlen(calling);
166 
167         *p++ = (calling_len << 4) | (called_len << 0);
168 
169         for (i = 0; i < (called_len + calling_len); i++) {
170                 if (i < called_len) {
171                         if (i % 2 != 0) {
172                                 *p |= (*called++ - '') << 0;
173                                 p++;
174                         } else {
175                                 *p = 0x00;
176                                 *p |= (*called++ - '') << 4;
177                         }
178                 } else {
179                         if (i % 2 != 0) {
180                                 *p |= (*calling++ - '') << 0;
181                                 p++;
182                         } else {
183                                 *p = 0x00;
184                                 *p |= (*calling++ - '') << 4;
185                         }
186                 }
187         }
188 
189         return 1 + (called_len + calling_len + 1) / 2;
190 }
191 
192 /*
193  *      Socket removal during an interrupt is now safe.
194  */
195 static void x25_remove_socket(struct sock *sk)
196 {
197         write_lock_bh(&x25_list_lock);
198         sk_del_node_init(sk);
199         write_unlock_bh(&x25_list_lock);
200 }
201 
202 /*
203  *      Kill all bound sockets on a dropped device.
204  */
205 static void x25_kill_by_device(struct net_device *dev)
206 {
207         struct sock *s;
208 
209         write_lock_bh(&x25_list_lock);
210 
211         sk_for_each(s, &x25_list)
212                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
213                         x25_disconnect(s, ENETUNREACH, 0, 0);
214 
215         write_unlock_bh(&x25_list_lock);
216 }
217 
218 /*
219  *      Handle device status changes.
220  */
221 static int x25_device_event(struct notifier_block *this, unsigned long event,
222                             void *ptr)
223 {
224         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
225         struct x25_neigh *nb;
226 
227         if (!net_eq(dev_net(dev), &init_net))
228                 return NOTIFY_DONE;
229 
230         if (dev->type == ARPHRD_X25
231 #if IS_ENABLED(CONFIG_LLC)
232          || dev->type == ARPHRD_ETHER
233 #endif
234          ) {
235                 switch (event) {
236                 case NETDEV_UP:
237                         x25_link_device_up(dev);
238                         break;
239                 case NETDEV_GOING_DOWN:
240                         nb = x25_get_neigh(dev);
241                         if (nb) {
242                                 x25_terminate_link(nb);
243                                 x25_neigh_put(nb);
244                         }
245                         break;
246                 case NETDEV_DOWN:
247                         x25_kill_by_device(dev);
248                         x25_route_device_down(dev);
249                         x25_link_device_down(dev);
250                         break;
251                 }
252         }
253 
254         return NOTIFY_DONE;
255 }
256 
257 /*
258  *      Add a socket to the bound sockets list.
259  */
260 static void x25_insert_socket(struct sock *sk)
261 {
262         write_lock_bh(&x25_list_lock);
263         sk_add_node(sk, &x25_list);
264         write_unlock_bh(&x25_list_lock);
265 }
266 
267 /*
268  *      Find a socket that wants to accept the Call Request we just
269  *      received. Check the full list for an address/cud match.
270  *      If no cuds match return the next_best thing, an address match.
271  *      Note: if a listening socket has cud set it must only get calls
272  *      with matching cud.
273  */
274 static struct sock *x25_find_listener(struct x25_address *addr,
275                                         struct sk_buff *skb)
276 {
277         struct sock *s;
278         struct sock *next_best;
279 
280         read_lock_bh(&x25_list_lock);
281         next_best = NULL;
282 
283         sk_for_each(s, &x25_list)
284                 if ((!strcmp(addr->x25_addr,
285                         x25_sk(s)->source_addr.x25_addr) ||
286                                 !strcmp(x25_sk(s)->source_addr.x25_addr,
287                                         null_x25_address.x25_addr)) &&
288                                         s->sk_state == TCP_LISTEN) {
289                         /*
290                          * Found a listening socket, now check the incoming
291                          * call user data vs this sockets call user data
292                          */
293                         if (x25_sk(s)->cudmatchlength > 0 &&
294                                 skb->len >= x25_sk(s)->cudmatchlength) {
295                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
296                                         skb->data,
297                                         x25_sk(s)->cudmatchlength)) == 0) {
298                                         sock_hold(s);
299                                         goto found;
300                                  }
301                         } else
302                                 next_best = s;
303                 }
304         if (next_best) {
305                 s = next_best;
306                 sock_hold(s);
307                 goto found;
308         }
309         s = NULL;
310 found:
311         read_unlock_bh(&x25_list_lock);
312         return s;
313 }
314 
315 /*
316  *      Find a connected X.25 socket given my LCI and neighbour.
317  */
318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
319 {
320         struct sock *s;
321 
322         sk_for_each(s, &x25_list)
323                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
324                         sock_hold(s);
325                         goto found;
326                 }
327         s = NULL;
328 found:
329         return s;
330 }
331 
332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
333 {
334         struct sock *s;
335 
336         read_lock_bh(&x25_list_lock);
337         s = __x25_find_socket(lci, nb);
338         read_unlock_bh(&x25_list_lock);
339         return s;
340 }
341 
342 /*
343  *      Find a unique LCI for a given device.
344  */
345 static unsigned int x25_new_lci(struct x25_neigh *nb)
346 {
347         unsigned int lci = 1;
348         struct sock *sk;
349 
350         while ((sk = x25_find_socket(lci, nb)) != NULL) {
351                 sock_put(sk);
352                 if (++lci == 4096) {
353                         lci = 0;
354                         break;
355                 }
356                 cond_resched();
357         }
358 
359         return lci;
360 }
361 
362 /*
363  *      Deferred destroy.
364  */
365 static void __x25_destroy_socket(struct sock *);
366 
367 /*
368  *      handler for deferred kills.
369  */
370 static void x25_destroy_timer(struct timer_list *t)
371 {
372         struct sock *sk = from_timer(sk, t, sk_timer);
373 
374         x25_destroy_socket_from_timer(sk);
375 }
376 
377 /*
378  *      This is called from user mode and the timers. Thus it protects itself
379  *      against interrupt users but doesn't worry about being called during
380  *      work. Once it is removed from the queue no interrupt or bottom half
381  *      will touch it and we are (fairly 8-) ) safe.
382  *      Not static as it's used by the timer
383  */
384 static void __x25_destroy_socket(struct sock *sk)
385 {
386         struct sk_buff *skb;
387 
388         x25_stop_heartbeat(sk);
389         x25_stop_timer(sk);
390 
391         x25_remove_socket(sk);
392         x25_clear_queues(sk);           /* Flush the queues */
393 
394         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
395                 if (skb->sk != sk) {            /* A pending connection */
396                         /*
397                          * Queue the unaccepted socket for death
398                          */
399                         skb->sk->sk_state = TCP_LISTEN;
400                         sock_set_flag(skb->sk, SOCK_DEAD);
401                         x25_start_heartbeat(skb->sk);
402                         x25_sk(skb->sk)->state = X25_STATE_0;
403                 }
404 
405                 kfree_skb(skb);
406         }
407 
408         if (sk_has_allocations(sk)) {
409                 /* Defer: outstanding buffers */
410                 sk->sk_timer.expires  = jiffies + 10 * HZ;
411                 sk->sk_timer.function = x25_destroy_timer;
412                 add_timer(&sk->sk_timer);
413         } else {
414                 /* drop last reference so sock_put will free */
415                 __sock_put(sk);
416         }
417 }
418 
419 void x25_destroy_socket_from_timer(struct sock *sk)
420 {
421         sock_hold(sk);
422         bh_lock_sock(sk);
423         __x25_destroy_socket(sk);
424         bh_unlock_sock(sk);
425         sock_put(sk);
426 }
427 
428 /*
429  *      Handling for system calls applied via the various interfaces to a
430  *      X.25 socket object.
431  */
432 
433 static int x25_setsockopt(struct socket *sock, int level, int optname,
434                           sockptr_t optval, unsigned int optlen)
435 {
436         int opt;
437         struct sock *sk = sock->sk;
438         int rc = -ENOPROTOOPT;
439 
440         if (level != SOL_X25 || optname != X25_QBITINCL)
441                 goto out;
442 
443         rc = -EINVAL;
444         if (optlen < sizeof(int))
445                 goto out;
446 
447         rc = -EFAULT;
448         if (copy_from_sockptr(&opt, optval, sizeof(int)))
449                 goto out;
450 
451         if (opt)
452                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
453         else
454                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
455         rc = 0;
456 out:
457         return rc;
458 }
459 
460 static int x25_getsockopt(struct socket *sock, int level, int optname,
461                           char __user *optval, int __user *optlen)
462 {
463         struct sock *sk = sock->sk;
464         int val, len, rc = -ENOPROTOOPT;
465 
466         if (level != SOL_X25 || optname != X25_QBITINCL)
467                 goto out;
468 
469         rc = -EFAULT;
470         if (get_user(len, optlen))
471                 goto out;
472 
473         len = min_t(unsigned int, len, sizeof(int));
474 
475         rc = -EINVAL;
476         if (len < 0)
477                 goto out;
478 
479         rc = -EFAULT;
480         if (put_user(len, optlen))
481                 goto out;
482 
483         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
484         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
485 out:
486         return rc;
487 }
488 
489 static int x25_listen(struct socket *sock, int backlog)
490 {
491         struct sock *sk = sock->sk;
492         int rc = -EOPNOTSUPP;
493 
494         lock_sock(sk);
495         if (sk->sk_state != TCP_LISTEN) {
496                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
497                 sk->sk_max_ack_backlog = backlog;
498                 sk->sk_state           = TCP_LISTEN;
499                 rc = 0;
500         }
501         release_sock(sk);
502 
503         return rc;
504 }
505 
506 static struct proto x25_proto = {
507         .name     = "X25",
508         .owner    = THIS_MODULE,
509         .obj_size = sizeof(struct x25_sock),
510 };
511 
512 static struct sock *x25_alloc_socket(struct net *net, int kern)
513 {
514         struct x25_sock *x25;
515         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
516 
517         if (!sk)
518                 goto out;
519 
520         sock_init_data(NULL, sk);
521 
522         x25 = x25_sk(sk);
523         skb_queue_head_init(&x25->ack_queue);
524         skb_queue_head_init(&x25->fragment_queue);
525         skb_queue_head_init(&x25->interrupt_in_queue);
526         skb_queue_head_init(&x25->interrupt_out_queue);
527 out:
528         return sk;
529 }
530 
531 static int x25_create(struct net *net, struct socket *sock, int protocol,
532                       int kern)
533 {
534         struct sock *sk;
535         struct x25_sock *x25;
536         int rc = -EAFNOSUPPORT;
537 
538         if (!net_eq(net, &init_net))
539                 goto out;
540 
541         rc = -ESOCKTNOSUPPORT;
542         if (sock->type != SOCK_SEQPACKET)
543                 goto out;
544 
545         rc = -EINVAL;
546         if (protocol)
547                 goto out;
548 
549         rc = -ENOBUFS;
550         if ((sk = x25_alloc_socket(net, kern)) == NULL)
551                 goto out;
552 
553         x25 = x25_sk(sk);
554 
555         sock_init_data(sock, sk);
556 
557         x25_init_timers(sk);
558 
559         sock->ops    = &x25_proto_ops;
560         sk->sk_protocol = protocol;
561         sk->sk_backlog_rcv = x25_backlog_rcv;
562 
563         x25->t21   = sysctl_x25_call_request_timeout;
564         x25->t22   = sysctl_x25_reset_request_timeout;
565         x25->t23   = sysctl_x25_clear_request_timeout;
566         x25->t2    = sysctl_x25_ack_holdback_timeout;
567         x25->state = X25_STATE_0;
568         x25->cudmatchlength = 0;
569         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
570                                                         /* on call accept   */
571 
572         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
573         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
574         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
575         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
576         x25->facilities.throughput  = 0;        /* by default don't negotiate
577                                                    throughput */
578         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
579         x25->dte_facilities.calling_len = 0;
580         x25->dte_facilities.called_len = 0;
581         memset(x25->dte_facilities.called_ae, '\0',
582                         sizeof(x25->dte_facilities.called_ae));
583         memset(x25->dte_facilities.calling_ae, '\0',
584                         sizeof(x25->dte_facilities.calling_ae));
585 
586         rc = 0;
587 out:
588         return rc;
589 }
590 
591 static struct sock *x25_make_new(struct sock *osk)
592 {
593         struct sock *sk = NULL;
594         struct x25_sock *x25, *ox25;
595 
596         if (osk->sk_type != SOCK_SEQPACKET)
597                 goto out;
598 
599         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
600                 goto out;
601 
602         x25 = x25_sk(sk);
603 
604         sk->sk_type        = osk->sk_type;
605         sk->sk_priority    = osk->sk_priority;
606         sk->sk_protocol    = osk->sk_protocol;
607         sk->sk_rcvbuf      = osk->sk_rcvbuf;
608         sk->sk_sndbuf      = osk->sk_sndbuf;
609         sk->sk_state       = TCP_ESTABLISHED;
610         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
611         sock_copy_flags(sk, osk);
612 
613         ox25 = x25_sk(osk);
614         x25->t21        = ox25->t21;
615         x25->t22        = ox25->t22;
616         x25->t23        = ox25->t23;
617         x25->t2         = ox25->t2;
618         x25->flags      = ox25->flags;
619         x25->facilities = ox25->facilities;
620         x25->dte_facilities = ox25->dte_facilities;
621         x25->cudmatchlength = ox25->cudmatchlength;
622 
623         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
624         x25_init_timers(sk);
625 out:
626         return sk;
627 }
628 
629 static int x25_release(struct socket *sock)
630 {
631         struct sock *sk = sock->sk;
632         struct x25_sock *x25;
633 
634         if (!sk)
635                 return 0;
636 
637         x25 = x25_sk(sk);
638 
639         sock_hold(sk);
640         lock_sock(sk);
641         switch (x25->state) {
642 
643                 case X25_STATE_0:
644                 case X25_STATE_2:
645                         x25_disconnect(sk, 0, 0, 0);
646                         __x25_destroy_socket(sk);
647                         goto out;
648 
649                 case X25_STATE_1:
650                 case X25_STATE_3:
651                 case X25_STATE_4:
652                         x25_clear_queues(sk);
653                         x25_write_internal(sk, X25_CLEAR_REQUEST);
654                         x25_start_t23timer(sk);
655                         x25->state = X25_STATE_2;
656                         sk->sk_state    = TCP_CLOSE;
657                         sk->sk_shutdown |= SEND_SHUTDOWN;
658                         sk->sk_state_change(sk);
659                         sock_set_flag(sk, SOCK_DEAD);
660                         sock_set_flag(sk, SOCK_DESTROY);
661                         break;
662 
663                 case X25_STATE_5:
664                         x25_write_internal(sk, X25_CLEAR_REQUEST);
665                         x25_disconnect(sk, 0, 0, 0);
666                         __x25_destroy_socket(sk);
667                         goto out;
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 (addr_len != sizeof(struct sockaddr_x25) ||
684             addr->sx25_family != AF_X25) {
685                 rc = -EINVAL;
686                 goto out;
687         }
688 
689         /* check for the null_x25_address */
690         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
691 
692                 len = strlen(addr->sx25_addr.x25_addr);
693                 for (i = 0; i < len; i++) {
694                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
695                                 rc = -EINVAL;
696                                 goto out;
697                         }
698                 }
699         }
700 
701         lock_sock(sk);
702         if (sock_flag(sk, SOCK_ZAPPED)) {
703                 x25_sk(sk)->source_addr = addr->sx25_addr;
704                 x25_insert_socket(sk);
705                 sock_reset_flag(sk, SOCK_ZAPPED);
706         } else {
707                 rc = -EINVAL;
708         }
709         release_sock(sk);
710         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
711 out:
712         return rc;
713 }
714 
715 static int x25_wait_for_connection_establishment(struct sock *sk)
716 {
717         DECLARE_WAITQUEUE(wait, current);
718         int rc;
719 
720         add_wait_queue_exclusive(sk_sleep(sk), &wait);
721         for (;;) {
722                 __set_current_state(TASK_INTERRUPTIBLE);
723                 rc = -ERESTARTSYS;
724                 if (signal_pending(current))
725                         break;
726                 rc = sock_error(sk);
727                 if (rc) {
728                         sk->sk_socket->state = SS_UNCONNECTED;
729                         break;
730                 }
731                 rc = 0;
732                 if (sk->sk_state != TCP_ESTABLISHED) {
733                         release_sock(sk);
734                         schedule();
735                         lock_sock(sk);
736                 } else
737                         break;
738         }
739         __set_current_state(TASK_RUNNING);
740         remove_wait_queue(sk_sleep(sk), &wait);
741         return rc;
742 }
743 
744 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
745                        int addr_len, int flags)
746 {
747         struct sock *sk = sock->sk;
748         struct x25_sock *x25 = x25_sk(sk);
749         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
750         struct x25_route *rt;
751         int rc = 0;
752 
753         lock_sock(sk);
754         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
755                 sock->state = SS_CONNECTED;
756                 goto out; /* Connect completed during a ERESTARTSYS event */
757         }
758 
759         rc = -ECONNREFUSED;
760         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
761                 sock->state = SS_UNCONNECTED;
762                 goto out;
763         }
764 
765         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
766         if (sk->sk_state == TCP_ESTABLISHED)
767                 goto out;
768 
769         rc = -EALREADY; /* Do nothing if call is already in progress */
770         if (sk->sk_state == TCP_SYN_SENT)
771                 goto out;
772 
773         sk->sk_state   = TCP_CLOSE;
774         sock->state = SS_UNCONNECTED;
775 
776         rc = -EINVAL;
777         if (addr_len != sizeof(struct sockaddr_x25) ||
778             addr->sx25_family != AF_X25)
779                 goto out;
780 
781         rc = -ENETUNREACH;
782         rt = x25_get_route(&addr->sx25_addr);
783         if (!rt)
784                 goto out;
785 
786         x25->neighbour = x25_get_neigh(rt->dev);
787         if (!x25->neighbour)
788                 goto out_put_route;
789 
790         x25_limit_facilities(&x25->facilities, x25->neighbour);
791 
792         x25->lci = x25_new_lci(x25->neighbour);
793         if (!x25->lci)
794                 goto out_put_neigh;
795 
796         rc = -EINVAL;
797         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
798                 goto out_put_neigh;
799 
800         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
801                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
802 
803         x25->dest_addr = addr->sx25_addr;
804 
805         /* Move to connecting socket, start sending Connect Requests */
806         sock->state   = SS_CONNECTING;
807         sk->sk_state  = TCP_SYN_SENT;
808 
809         x25->state = X25_STATE_1;
810 
811         x25_write_internal(sk, X25_CALL_REQUEST);
812 
813         x25_start_heartbeat(sk);
814         x25_start_t21timer(sk);
815 
816         /* Now the loop */
817         rc = -EINPROGRESS;
818         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
819                 goto out;
820 
821         rc = x25_wait_for_connection_establishment(sk);
822         if (rc)
823                 goto out_put_neigh;
824 
825         sock->state = SS_CONNECTED;
826         rc = 0;
827 out_put_neigh:
828         if (rc && x25->neighbour) {
829                 read_lock_bh(&x25_list_lock);
830                 x25_neigh_put(x25->neighbour);
831                 x25->neighbour = NULL;
832                 read_unlock_bh(&x25_list_lock);
833                 x25->state = X25_STATE_0;
834         }
835 out_put_route:
836         x25_route_put(rt);
837 out:
838         release_sock(sk);
839         return rc;
840 }
841 
842 static int x25_wait_for_data(struct sock *sk, long timeout)
843 {
844         DECLARE_WAITQUEUE(wait, current);
845         int rc = 0;
846 
847         add_wait_queue_exclusive(sk_sleep(sk), &wait);
848         for (;;) {
849                 __set_current_state(TASK_INTERRUPTIBLE);
850                 if (sk->sk_shutdown & RCV_SHUTDOWN)
851                         break;
852                 rc = -ERESTARTSYS;
853                 if (signal_pending(current))
854                         break;
855                 rc = -EAGAIN;
856                 if (!timeout)
857                         break;
858                 rc = 0;
859                 if (skb_queue_empty(&sk->sk_receive_queue)) {
860                         release_sock(sk);
861                         timeout = schedule_timeout(timeout);
862                         lock_sock(sk);
863                 } else
864                         break;
865         }
866         __set_current_state(TASK_RUNNING);
867         remove_wait_queue(sk_sleep(sk), &wait);
868         return rc;
869 }
870 
871 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
872                       bool kern)
873 {
874         struct sock *sk = sock->sk;
875         struct sock *newsk;
876         struct sk_buff *skb;
877         int rc = -EINVAL;
878 
879         if (!sk)
880                 goto out;
881 
882         rc = -EOPNOTSUPP;
883         if (sk->sk_type != SOCK_SEQPACKET)
884                 goto out;
885 
886         lock_sock(sk);
887         rc = -EINVAL;
888         if (sk->sk_state != TCP_LISTEN)
889                 goto out2;
890 
891         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
892         if (rc)
893                 goto out2;
894         skb = skb_dequeue(&sk->sk_receive_queue);
895         rc = -EINVAL;
896         if (!skb->sk)
897                 goto out2;
898         newsk            = skb->sk;
899         sock_graft(newsk, newsock);
900 
901         /* Now attach up the new socket */
902         skb->sk = NULL;
903         kfree_skb(skb);
904         sk_acceptq_removed(sk);
905         newsock->state = SS_CONNECTED;
906         rc = 0;
907 out2:
908         release_sock(sk);
909 out:
910         return rc;
911 }
912 
913 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
914                        int peer)
915 {
916         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
917         struct sock *sk = sock->sk;
918         struct x25_sock *x25 = x25_sk(sk);
919         int rc = 0;
920 
921         if (peer) {
922                 if (sk->sk_state != TCP_ESTABLISHED) {
923                         rc = -ENOTCONN;
924                         goto out;
925                 }
926                 sx25->sx25_addr = x25->dest_addr;
927         } else
928                 sx25->sx25_addr = x25->source_addr;
929 
930         sx25->sx25_family = AF_X25;
931         rc = sizeof(*sx25);
932 
933 out:
934         return rc;
935 }
936 
937 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
938                         unsigned int lci)
939 {
940         struct sock *sk;
941         struct sock *make;
942         struct x25_sock *makex25;
943         struct x25_address source_addr, dest_addr;
944         struct x25_facilities facilities;
945         struct x25_dte_facilities dte_facilities;
946         int len, addr_len, rc;
947 
948         /*
949          *      Remove the LCI and frame type.
950          */
951         skb_pull(skb, X25_STD_MIN_LEN);
952 
953         /*
954          *      Extract the X.25 addresses and convert them to ASCII strings,
955          *      and remove them.
956          *
957          *      Address block is mandatory in call request packets
958          */
959         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
960         if (addr_len <= 0)
961                 goto out_clear_request;
962         skb_pull(skb, addr_len);
963 
964         /*
965          *      Get the length of the facilities, skip past them for the moment
966          *      get the call user data because this is needed to determine
967          *      the correct listener
968          *
969          *      Facilities length is mandatory in call request packets
970          */
971         if (!pskb_may_pull(skb, 1))
972                 goto out_clear_request;
973         len = skb->data[0] + 1;
974         if (!pskb_may_pull(skb, len))
975                 goto out_clear_request;
976         skb_pull(skb,len);
977 
978         /*
979          *      Ensure that the amount of call user data is valid.
980          */
981         if (skb->len > X25_MAX_CUD_LEN)
982                 goto out_clear_request;
983 
984         /*
985          *      Get all the call user data so it can be used in
986          *      x25_find_listener and skb_copy_from_linear_data up ahead.
987          */
988         if (!pskb_may_pull(skb, skb->len))
989                 goto out_clear_request;
990 
991         /*
992          *      Find a listener for the particular address/cud pair.
993          */
994         sk = x25_find_listener(&source_addr,skb);
995         skb_push(skb,len);
996 
997         if (sk != NULL && sk_acceptq_is_full(sk)) {
998                 goto out_sock_put;
999         }
1000 
1001         /*
1002          *      We dont have any listeners for this incoming call.
1003          *      Try forwarding it.
1004          */
1005         if (sk == NULL) {
1006                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1007                 if (sysctl_x25_forward &&
1008                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1009                 {
1010                         /* Call was forwarded, dont process it any more */
1011                         kfree_skb(skb);
1012                         rc = 1;
1013                         goto out;
1014                 } else {
1015                         /* No listeners, can't forward, clear the call */
1016                         goto out_clear_request;
1017                 }
1018         }
1019 
1020         /*
1021          *      Try to reach a compromise on the requested facilities.
1022          */
1023         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1024         if (len == -1)
1025                 goto out_sock_put;
1026 
1027         /*
1028          * current neighbour/link might impose additional limits
1029          * on certain facilties
1030          */
1031 
1032         x25_limit_facilities(&facilities, nb);
1033 
1034         /*
1035          *      Try to create a new socket.
1036          */
1037         make = x25_make_new(sk);
1038         if (!make)
1039                 goto out_sock_put;
1040 
1041         /*
1042          *      Remove the facilities
1043          */
1044         skb_pull(skb, len);
1045 
1046         skb->sk     = make;
1047         make->sk_state = TCP_ESTABLISHED;
1048 
1049         makex25 = x25_sk(make);
1050         makex25->lci           = lci;
1051         makex25->dest_addr     = dest_addr;
1052         makex25->source_addr   = source_addr;
1053         x25_neigh_hold(nb);
1054         makex25->neighbour     = nb;
1055         makex25->facilities    = facilities;
1056         makex25->dte_facilities= dte_facilities;
1057         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1058         /* ensure no reverse facil on accept */
1059         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1060         /* ensure no calling address extension on accept */
1061         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1062         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1063 
1064         /* Normally all calls are accepted immediately */
1065         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1066                 x25_write_internal(make, X25_CALL_ACCEPTED);
1067                 makex25->state = X25_STATE_3;
1068         } else {
1069                 makex25->state = X25_STATE_5;
1070         }
1071 
1072         /*
1073          *      Incoming Call User Data.
1074          */
1075         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1076         makex25->calluserdata.cudlength = skb->len;
1077 
1078         sk_acceptq_added(sk);
1079 
1080         x25_insert_socket(make);
1081 
1082         skb_queue_head(&sk->sk_receive_queue, skb);
1083 
1084         x25_start_heartbeat(make);
1085 
1086         if (!sock_flag(sk, SOCK_DEAD))
1087                 sk->sk_data_ready(sk);
1088         rc = 1;
1089         sock_put(sk);
1090 out:
1091         return rc;
1092 out_sock_put:
1093         sock_put(sk);
1094 out_clear_request:
1095         rc = 0;
1096         x25_transmit_clear_request(nb, lci, 0x01);
1097         goto out;
1098 }
1099 
1100 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1101 {
1102         struct sock *sk = sock->sk;
1103         struct x25_sock *x25 = x25_sk(sk);
1104         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1105         struct sockaddr_x25 sx25;
1106         struct sk_buff *skb;
1107         unsigned char *asmptr;
1108         int noblock = msg->msg_flags & MSG_DONTWAIT;
1109         size_t size;
1110         int qbit = 0, rc = -EINVAL;
1111 
1112         lock_sock(sk);
1113         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1114                 goto out;
1115 
1116         /* we currently don't support segmented records at the user interface */
1117         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1118                 goto out;
1119 
1120         rc = -EADDRNOTAVAIL;
1121         if (sock_flag(sk, SOCK_ZAPPED))
1122                 goto out;
1123 
1124         rc = -EPIPE;
1125         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1126                 send_sig(SIGPIPE, current, 0);
1127                 goto out;
1128         }
1129 
1130         rc = -ENETUNREACH;
1131         if (!x25->neighbour)
1132                 goto out;
1133 
1134         if (usx25) {
1135                 rc = -EINVAL;
1136                 if (msg->msg_namelen < sizeof(sx25))
1137                         goto out;
1138                 memcpy(&sx25, usx25, sizeof(sx25));
1139                 rc = -EISCONN;
1140                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1141                         goto out;
1142                 rc = -EINVAL;
1143                 if (sx25.sx25_family != AF_X25)
1144                         goto out;
1145         } else {
1146                 /*
1147                  *      FIXME 1003.1g - if the socket is like this because
1148                  *      it has become closed (not started closed) we ought
1149                  *      to SIGPIPE, EPIPE;
1150                  */
1151                 rc = -ENOTCONN;
1152                 if (sk->sk_state != TCP_ESTABLISHED)
1153                         goto out;
1154 
1155                 sx25.sx25_family = AF_X25;
1156                 sx25.sx25_addr   = x25->dest_addr;
1157         }
1158 
1159         /* Sanity check the packet size */
1160         if (len > 65535) {
1161                 rc = -EMSGSIZE;
1162                 goto out;
1163         }
1164 
1165         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1166 
1167         /* Build a packet */
1168         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1169 
1170         if ((msg->msg_flags & MSG_OOB) && len > 32)
1171                 len = 32;
1172 
1173         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1174 
1175         release_sock(sk);
1176         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1177         lock_sock(sk);
1178         if (!skb)
1179                 goto out;
1180         X25_SKB_CB(skb)->flags = msg->msg_flags;
1181 
1182         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1183 
1184         /*
1185          *      Put the data on the end
1186          */
1187         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1188 
1189         skb_reset_transport_header(skb);
1190         skb_put(skb, len);
1191 
1192         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1193         if (rc)
1194                 goto out_kfree_skb;
1195 
1196         /*
1197          *      If the Q BIT Include socket option is in force, the first
1198          *      byte of the user data is the logical value of the Q Bit.
1199          */
1200         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1201                 if (!pskb_may_pull(skb, 1))
1202                         goto out_kfree_skb;
1203 
1204                 qbit = skb->data[0];
1205                 skb_pull(skb, 1);
1206         }
1207 
1208         /*
1209          *      Push down the X.25 header
1210          */
1211         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1212 
1213         if (msg->msg_flags & MSG_OOB) {
1214                 if (x25->neighbour->extended) {
1215                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1216                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1218                         *asmptr++ = X25_INTERRUPT;
1219                 } else {
1220                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1221                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1222                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1223                         *asmptr++ = X25_INTERRUPT;
1224                 }
1225         } else {
1226                 if (x25->neighbour->extended) {
1227                         /* Build an Extended X.25 header */
1228                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1229                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1230                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1231                         *asmptr++ = X25_DATA;
1232                         *asmptr++ = X25_DATA;
1233                 } else {
1234                         /* Build an Standard X.25 header */
1235                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1236                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1237                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1238                         *asmptr++ = X25_DATA;
1239                 }
1240 
1241                 if (qbit)
1242                         skb->data[0] |= X25_Q_BIT;
1243         }
1244 
1245         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1246         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1247 
1248         rc = -ENOTCONN;
1249         if (sk->sk_state != TCP_ESTABLISHED)
1250                 goto out_kfree_skb;
1251 
1252         if (msg->msg_flags & MSG_OOB)
1253                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1254         else {
1255                 rc = x25_output(sk, skb);
1256                 len = rc;
1257                 if (rc < 0)
1258                         kfree_skb(skb);
1259                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1260                         len++;
1261         }
1262 
1263         x25_kick(sk);
1264         rc = len;
1265 out:
1266         release_sock(sk);
1267         return rc;
1268 out_kfree_skb:
1269         kfree_skb(skb);
1270         goto out;
1271 }
1272 
1273 
1274 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1275                        int flags)
1276 {
1277         struct sock *sk = sock->sk;
1278         struct x25_sock *x25 = x25_sk(sk);
1279         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1280         size_t copied;
1281         int qbit, header_len;
1282         struct sk_buff *skb;
1283         unsigned char *asmptr;
1284         int rc = -ENOTCONN;
1285 
1286         lock_sock(sk);
1287 
1288         if (x25->neighbour == NULL)
1289                 goto out;
1290 
1291         header_len = x25->neighbour->extended ?
1292                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1293 
1294         /*
1295          * This works for seqpacket too. The receiver has ordered the queue for
1296          * us! We do one quick check first though
1297          */
1298         if (sk->sk_state != TCP_ESTABLISHED)
1299                 goto out;
1300 
1301         if (flags & MSG_OOB) {
1302                 rc = -EINVAL;
1303                 if (sock_flag(sk, SOCK_URGINLINE) ||
1304                     !skb_peek(&x25->interrupt_in_queue))
1305                         goto out;
1306 
1307                 skb = skb_dequeue(&x25->interrupt_in_queue);
1308 
1309                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1310                         goto out_free_dgram;
1311 
1312                 skb_pull(skb, X25_STD_MIN_LEN);
1313 
1314                 /*
1315                  *      No Q bit information on Interrupt data.
1316                  */
1317                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1318                         asmptr  = skb_push(skb, 1);
1319                         *asmptr = 0x00;
1320                 }
1321 
1322                 msg->msg_flags |= MSG_OOB;
1323         } else {
1324                 /* Now we can treat all alike */
1325                 release_sock(sk);
1326                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1327                                         flags & MSG_DONTWAIT, &rc);
1328                 lock_sock(sk);
1329                 if (!skb)
1330                         goto out;
1331 
1332                 if (!pskb_may_pull(skb, header_len))
1333                         goto out_free_dgram;
1334 
1335                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1336 
1337                 skb_pull(skb, header_len);
1338 
1339                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1340                         asmptr  = skb_push(skb, 1);
1341                         *asmptr = qbit;
1342                 }
1343         }
1344 
1345         skb_reset_transport_header(skb);
1346         copied = skb->len;
1347 
1348         if (copied > size) {
1349                 copied = size;
1350                 msg->msg_flags |= MSG_TRUNC;
1351         }
1352 
1353         /* Currently, each datagram always contains a complete record */
1354         msg->msg_flags |= MSG_EOR;
1355 
1356         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1357         if (rc)
1358                 goto out_free_dgram;
1359 
1360         if (sx25) {
1361                 sx25->sx25_family = AF_X25;
1362                 sx25->sx25_addr   = x25->dest_addr;
1363                 msg->msg_namelen = sizeof(*sx25);
1364         }
1365 
1366         x25_check_rbuf(sk);
1367         rc = copied;
1368 out_free_dgram:
1369         skb_free_datagram(sk, skb);
1370 out:
1371         release_sock(sk);
1372         return rc;
1373 }
1374 
1375 
1376 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1377 {
1378         struct sock *sk = sock->sk;
1379         struct x25_sock *x25 = x25_sk(sk);
1380         void __user *argp = (void __user *)arg;
1381         int rc;
1382 
1383         switch (cmd) {
1384         case TIOCOUTQ: {
1385                 int amount;
1386 
1387                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1388                 if (amount < 0)
1389                         amount = 0;
1390                 rc = put_user(amount, (unsigned int __user *)argp);
1391                 break;
1392         }
1393 
1394         case TIOCINQ: {
1395                 struct sk_buff *skb;
1396                 int amount = 0;
1397                 /*
1398                  * These two are safe on a single CPU system as
1399                  * only user tasks fiddle here
1400                  */
1401                 lock_sock(sk);
1402                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1403                         amount = skb->len;
1404                 release_sock(sk);
1405                 rc = put_user(amount, (unsigned int __user *)argp);
1406                 break;
1407         }
1408 
1409         case SIOCGIFADDR:
1410         case SIOCSIFADDR:
1411         case SIOCGIFDSTADDR:
1412         case SIOCSIFDSTADDR:
1413         case SIOCGIFBRDADDR:
1414         case SIOCSIFBRDADDR:
1415         case SIOCGIFNETMASK:
1416         case SIOCSIFNETMASK:
1417         case SIOCGIFMETRIC:
1418         case SIOCSIFMETRIC:
1419                 rc = -EINVAL;
1420                 break;
1421         case SIOCADDRT:
1422         case SIOCDELRT:
1423                 rc = -EPERM;
1424                 if (!capable(CAP_NET_ADMIN))
1425                         break;
1426                 rc = x25_route_ioctl(cmd, argp);
1427                 break;
1428         case SIOCX25GSUBSCRIP:
1429                 rc = x25_subscr_ioctl(cmd, argp);
1430                 break;
1431         case SIOCX25SSUBSCRIP:
1432                 rc = -EPERM;
1433                 if (!capable(CAP_NET_ADMIN))
1434                         break;
1435                 rc = x25_subscr_ioctl(cmd, argp);
1436                 break;
1437         case SIOCX25GFACILITIES: {
1438                 lock_sock(sk);
1439                 rc = copy_to_user(argp, &x25->facilities,
1440                                   sizeof(x25->facilities))
1441                         ? -EFAULT : 0;
1442                 release_sock(sk);
1443                 break;
1444         }
1445 
1446         case SIOCX25SFACILITIES: {
1447                 struct x25_facilities facilities;
1448                 rc = -EFAULT;
1449                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1450                         break;
1451                 rc = -EINVAL;
1452                 lock_sock(sk);
1453                 if (sk->sk_state != TCP_LISTEN &&
1454                     sk->sk_state != TCP_CLOSE)
1455                         goto out_fac_release;
1456                 if (facilities.pacsize_in < X25_PS16 ||
1457                     facilities.pacsize_in > X25_PS4096)
1458                         goto out_fac_release;
1459                 if (facilities.pacsize_out < X25_PS16 ||
1460                     facilities.pacsize_out > X25_PS4096)
1461                         goto out_fac_release;
1462                 if (facilities.winsize_in < 1 ||
1463                     facilities.winsize_in > 127)
1464                         goto out_fac_release;
1465                 if (facilities.throughput) {
1466                         int out = facilities.throughput & 0xf0;
1467                         int in  = facilities.throughput & 0x0f;
1468                         if (!out)
1469                                 facilities.throughput |=
1470                                         X25_DEFAULT_THROUGHPUT << 4;
1471                         else if (out < 0x30 || out > 0xD0)
1472                                 goto out_fac_release;
1473                         if (!in)
1474                                 facilities.throughput |=
1475                                         X25_DEFAULT_THROUGHPUT;
1476                         else if (in < 0x03 || in > 0x0D)
1477                                 goto out_fac_release;
1478                 }
1479                 if (facilities.reverse &&
1480                     (facilities.reverse & 0x81) != 0x81)
1481                         goto out_fac_release;
1482                 x25->facilities = facilities;
1483                 rc = 0;
1484 out_fac_release:
1485                 release_sock(sk);
1486                 break;
1487         }
1488 
1489         case SIOCX25GDTEFACILITIES: {
1490                 lock_sock(sk);
1491                 rc = copy_to_user(argp, &x25->dte_facilities,
1492                                   sizeof(x25->dte_facilities));
1493                 release_sock(sk);
1494                 if (rc)
1495                         rc = -EFAULT;
1496                 break;
1497         }
1498 
1499         case SIOCX25SDTEFACILITIES: {
1500                 struct x25_dte_facilities dtefacs;
1501                 rc = -EFAULT;
1502                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1503                         break;
1504                 rc = -EINVAL;
1505                 lock_sock(sk);
1506                 if (sk->sk_state != TCP_LISTEN &&
1507                     sk->sk_state != TCP_CLOSE)
1508                         goto out_dtefac_release;
1509                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1510                         goto out_dtefac_release;
1511                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1512                         goto out_dtefac_release;
1513                 x25->dte_facilities = dtefacs;
1514                 rc = 0;
1515 out_dtefac_release:
1516                 release_sock(sk);
1517                 break;
1518         }
1519 
1520         case SIOCX25GCALLUSERDATA: {
1521                 lock_sock(sk);
1522                 rc = copy_to_user(argp, &x25->calluserdata,
1523                                   sizeof(x25->calluserdata))
1524                         ? -EFAULT : 0;
1525                 release_sock(sk);
1526                 break;
1527         }
1528 
1529         case SIOCX25SCALLUSERDATA: {
1530                 struct x25_calluserdata calluserdata;
1531 
1532                 rc = -EFAULT;
1533                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1534                         break;
1535                 rc = -EINVAL;
1536                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1537                         break;
1538                 lock_sock(sk);
1539                 x25->calluserdata = calluserdata;
1540                 release_sock(sk);
1541                 rc = 0;
1542                 break;
1543         }
1544 
1545         case SIOCX25GCAUSEDIAG: {
1546                 lock_sock(sk);
1547                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1548                         ? -EFAULT : 0;
1549                 release_sock(sk);
1550                 break;
1551         }
1552 
1553         case SIOCX25SCAUSEDIAG: {
1554                 struct x25_causediag causediag;
1555                 rc = -EFAULT;
1556                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1557                         break;
1558                 lock_sock(sk);
1559                 x25->causediag = causediag;
1560                 release_sock(sk);
1561                 rc = 0;
1562                 break;
1563 
1564         }
1565 
1566         case SIOCX25SCUDMATCHLEN: {
1567                 struct x25_subaddr sub_addr;
1568                 rc = -EINVAL;
1569                 lock_sock(sk);
1570                 if(sk->sk_state != TCP_CLOSE)
1571                         goto out_cud_release;
1572                 rc = -EFAULT;
1573                 if (copy_from_user(&sub_addr, argp,
1574                                    sizeof(sub_addr)))
1575                         goto out_cud_release;
1576                 rc = -EINVAL;
1577                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1578                         goto out_cud_release;
1579                 x25->cudmatchlength = sub_addr.cudmatchlength;
1580                 rc = 0;
1581 out_cud_release:
1582                 release_sock(sk);
1583                 break;
1584         }
1585 
1586         case SIOCX25CALLACCPTAPPRV: {
1587                 rc = -EINVAL;
1588                 lock_sock(sk);
1589                 if (sk->sk_state == TCP_CLOSE) {
1590                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1591                         rc = 0;
1592                 }
1593                 release_sock(sk);
1594                 break;
1595         }
1596 
1597         case SIOCX25SENDCALLACCPT:  {
1598                 rc = -EINVAL;
1599                 lock_sock(sk);
1600                 if (sk->sk_state != TCP_ESTABLISHED)
1601                         goto out_sendcallaccpt_release;
1602                 /* must call accptapprv above */
1603                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1604                         goto out_sendcallaccpt_release;
1605                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1606                 x25->state = X25_STATE_3;
1607                 rc = 0;
1608 out_sendcallaccpt_release:
1609                 release_sock(sk);
1610                 break;
1611         }
1612 
1613         default:
1614                 rc = -ENOIOCTLCMD;
1615                 break;
1616         }
1617 
1618         return rc;
1619 }
1620 
1621 static const struct net_proto_family x25_family_ops = {
1622         .family =       AF_X25,
1623         .create =       x25_create,
1624         .owner  =       THIS_MODULE,
1625 };
1626 
1627 #ifdef CONFIG_COMPAT
1628 static int compat_x25_subscr_ioctl(unsigned int cmd,
1629                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1630 {
1631         struct compat_x25_subscrip_struct x25_subscr;
1632         struct x25_neigh *nb;
1633         struct net_device *dev;
1634         int rc = -EINVAL;
1635 
1636         rc = -EFAULT;
1637         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1638                 goto out;
1639 
1640         rc = -EINVAL;
1641         dev = x25_dev_get(x25_subscr.device);
1642         if (dev == NULL)
1643                 goto out;
1644 
1645         nb = x25_get_neigh(dev);
1646         if (nb == NULL)
1647                 goto out_dev_put;
1648 
1649         dev_put(dev);
1650 
1651         if (cmd == SIOCX25GSUBSCRIP) {
1652                 read_lock_bh(&x25_neigh_list_lock);
1653                 x25_subscr.extended = nb->extended;
1654                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1655                 read_unlock_bh(&x25_neigh_list_lock);
1656                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1657                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1658         } else {
1659                 rc = -EINVAL;
1660                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1661                         rc = 0;
1662                         write_lock_bh(&x25_neigh_list_lock);
1663                         nb->extended = x25_subscr.extended;
1664                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1665                         write_unlock_bh(&x25_neigh_list_lock);
1666                 }
1667         }
1668         x25_neigh_put(nb);
1669 out:
1670         return rc;
1671 out_dev_put:
1672         dev_put(dev);
1673         goto out;
1674 }
1675 
1676 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1677                                 unsigned long arg)
1678 {
1679         void __user *argp = compat_ptr(arg);
1680         int rc = -ENOIOCTLCMD;
1681 
1682         switch(cmd) {
1683         case TIOCOUTQ:
1684         case TIOCINQ:
1685                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1686                 break;
1687         case SIOCGIFADDR:
1688         case SIOCSIFADDR:
1689         case SIOCGIFDSTADDR:
1690         case SIOCSIFDSTADDR:
1691         case SIOCGIFBRDADDR:
1692         case SIOCSIFBRDADDR:
1693         case SIOCGIFNETMASK:
1694         case SIOCSIFNETMASK:
1695         case SIOCGIFMETRIC:
1696         case SIOCSIFMETRIC:
1697                 rc = -EINVAL;
1698                 break;
1699         case SIOCADDRT:
1700         case SIOCDELRT:
1701                 rc = -EPERM;
1702                 if (!capable(CAP_NET_ADMIN))
1703                         break;
1704                 rc = x25_route_ioctl(cmd, argp);
1705                 break;
1706         case SIOCX25GSUBSCRIP:
1707                 rc = compat_x25_subscr_ioctl(cmd, argp);
1708                 break;
1709         case SIOCX25SSUBSCRIP:
1710                 rc = -EPERM;
1711                 if (!capable(CAP_NET_ADMIN))
1712                         break;
1713                 rc = compat_x25_subscr_ioctl(cmd, argp);
1714                 break;
1715         case SIOCX25GFACILITIES:
1716         case SIOCX25SFACILITIES:
1717         case SIOCX25GDTEFACILITIES:
1718         case SIOCX25SDTEFACILITIES:
1719         case SIOCX25GCALLUSERDATA:
1720         case SIOCX25SCALLUSERDATA:
1721         case SIOCX25GCAUSEDIAG:
1722         case SIOCX25SCAUSEDIAG:
1723         case SIOCX25SCUDMATCHLEN:
1724         case SIOCX25CALLACCPTAPPRV:
1725         case SIOCX25SENDCALLACCPT:
1726                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1727                 break;
1728         default:
1729                 rc = -ENOIOCTLCMD;
1730                 break;
1731         }
1732         return rc;
1733 }
1734 #endif
1735 
1736 static const struct proto_ops x25_proto_ops = {
1737         .family =       AF_X25,
1738         .owner =        THIS_MODULE,
1739         .release =      x25_release,
1740         .bind =         x25_bind,
1741         .connect =      x25_connect,
1742         .socketpair =   sock_no_socketpair,
1743         .accept =       x25_accept,
1744         .getname =      x25_getname,
1745         .poll =         datagram_poll,
1746         .ioctl =        x25_ioctl,
1747 #ifdef CONFIG_COMPAT
1748         .compat_ioctl = compat_x25_ioctl,
1749 #endif
1750         .gettstamp =    sock_gettstamp,
1751         .listen =       x25_listen,
1752         .shutdown =     sock_no_shutdown,
1753         .setsockopt =   x25_setsockopt,
1754         .getsockopt =   x25_getsockopt,
1755         .sendmsg =      x25_sendmsg,
1756         .recvmsg =      x25_recvmsg,
1757         .mmap =         sock_no_mmap,
1758         .sendpage =     sock_no_sendpage,
1759 };
1760 
1761 static struct packet_type x25_packet_type __read_mostly = {
1762         .type = cpu_to_be16(ETH_P_X25),
1763         .func = x25_lapb_receive_frame,
1764 };
1765 
1766 static struct notifier_block x25_dev_notifier = {
1767         .notifier_call = x25_device_event,
1768 };
1769 
1770 void x25_kill_by_neigh(struct x25_neigh *nb)
1771 {
1772         struct sock *s;
1773 
1774         write_lock_bh(&x25_list_lock);
1775 
1776         sk_for_each(s, &x25_list)
1777                 if (x25_sk(s)->neighbour == nb)
1778                         x25_disconnect(s, ENETUNREACH, 0, 0);
1779 
1780         write_unlock_bh(&x25_list_lock);
1781 
1782         /* Remove any related forwards */
1783         x25_clear_forward_by_dev(nb->dev);
1784 }
1785 
1786 static int __init x25_init(void)
1787 {
1788         int rc;
1789 
1790         rc = proto_register(&x25_proto, 0);
1791         if (rc)
1792                 goto out;
1793 
1794         rc = sock_register(&x25_family_ops);
1795         if (rc)
1796                 goto out_proto;
1797 
1798         dev_add_pack(&x25_packet_type);
1799 
1800         rc = register_netdevice_notifier(&x25_dev_notifier);
1801         if (rc)
1802                 goto out_sock;
1803 
1804         rc = x25_register_sysctl();
1805         if (rc)
1806                 goto out_dev;
1807 
1808         rc = x25_proc_init();
1809         if (rc)
1810                 goto out_sysctl;
1811 
1812         pr_info("Linux Version 0.2\n");
1813 
1814 out:
1815         return rc;
1816 out_sysctl:
1817         x25_unregister_sysctl();
1818 out_dev:
1819         unregister_netdevice_notifier(&x25_dev_notifier);
1820 out_sock:
1821         dev_remove_pack(&x25_packet_type);
1822         sock_unregister(AF_X25);
1823 out_proto:
1824         proto_unregister(&x25_proto);
1825         goto out;
1826 }
1827 module_init(x25_init);
1828 
1829 static void __exit x25_exit(void)
1830 {
1831         x25_proc_exit();
1832         x25_link_free();
1833         x25_route_free();
1834 
1835         x25_unregister_sysctl();
1836 
1837         unregister_netdevice_notifier(&x25_dev_notifier);
1838 
1839         dev_remove_pack(&x25_packet_type);
1840 
1841         sock_unregister(AF_X25);
1842         proto_unregister(&x25_proto);
1843 }
1844 module_exit(x25_exit);
1845 
1846 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1847 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1848 MODULE_LICENSE("GPL");
1849 MODULE_ALIAS_NETPROTO(PF_X25);
1850 

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