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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  *      Handle device status changes.
204  */
205 static int x25_device_event(struct notifier_block *this, unsigned long event,
206                             void *ptr)
207 {
208         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
209         struct x25_neigh *nb;
210 
211         if (!net_eq(dev_net(dev), &init_net))
212                 return NOTIFY_DONE;
213 
214         if (dev->type == ARPHRD_X25) {
215                 switch (event) {
216                 case NETDEV_REGISTER:
217                 case NETDEV_POST_TYPE_CHANGE:
218                         x25_link_device_up(dev);
219                         break;
220                 case NETDEV_DOWN:
221                         nb = x25_get_neigh(dev);
222                         if (nb) {
223                                 x25_link_terminated(nb);
224                                 x25_neigh_put(nb);
225                         }
226                         x25_route_device_down(dev);
227                         break;
228                 case NETDEV_PRE_TYPE_CHANGE:
229                 case NETDEV_UNREGISTER:
230                         x25_link_device_down(dev);
231                         break;
232                 case NETDEV_CHANGE:
233                         if (!netif_carrier_ok(dev)) {
234                                 nb = x25_get_neigh(dev);
235                                 if (nb) {
236                                         x25_link_terminated(nb);
237                                         x25_neigh_put(nb);
238                                 }
239                         }
240                         break;
241                 }
242         }
243 
244         return NOTIFY_DONE;
245 }
246 
247 /*
248  *      Add a socket to the bound sockets list.
249  */
250 static void x25_insert_socket(struct sock *sk)
251 {
252         write_lock_bh(&x25_list_lock);
253         sk_add_node(sk, &x25_list);
254         write_unlock_bh(&x25_list_lock);
255 }
256 
257 /*
258  *      Find a socket that wants to accept the Call Request we just
259  *      received. Check the full list for an address/cud match.
260  *      If no cuds match return the next_best thing, an address match.
261  *      Note: if a listening socket has cud set it must only get calls
262  *      with matching cud.
263  */
264 static struct sock *x25_find_listener(struct x25_address *addr,
265                                         struct sk_buff *skb)
266 {
267         struct sock *s;
268         struct sock *next_best;
269 
270         read_lock_bh(&x25_list_lock);
271         next_best = NULL;
272 
273         sk_for_each(s, &x25_list)
274                 if ((!strcmp(addr->x25_addr,
275                         x25_sk(s)->source_addr.x25_addr) ||
276                                 !strcmp(x25_sk(s)->source_addr.x25_addr,
277                                         null_x25_address.x25_addr)) &&
278                                         s->sk_state == TCP_LISTEN) {
279                         /*
280                          * Found a listening socket, now check the incoming
281                          * call user data vs this sockets call user data
282                          */
283                         if (x25_sk(s)->cudmatchlength > 0 &&
284                                 skb->len >= x25_sk(s)->cudmatchlength) {
285                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
286                                         skb->data,
287                                         x25_sk(s)->cudmatchlength)) == 0) {
288                                         sock_hold(s);
289                                         goto found;
290                                  }
291                         } else
292                                 next_best = s;
293                 }
294         if (next_best) {
295                 s = next_best;
296                 sock_hold(s);
297                 goto found;
298         }
299         s = NULL;
300 found:
301         read_unlock_bh(&x25_list_lock);
302         return s;
303 }
304 
305 /*
306  *      Find a connected X.25 socket given my LCI and neighbour.
307  */
308 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
309 {
310         struct sock *s;
311 
312         sk_for_each(s, &x25_list)
313                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
314                         sock_hold(s);
315                         goto found;
316                 }
317         s = NULL;
318 found:
319         return s;
320 }
321 
322 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
323 {
324         struct sock *s;
325 
326         read_lock_bh(&x25_list_lock);
327         s = __x25_find_socket(lci, nb);
328         read_unlock_bh(&x25_list_lock);
329         return s;
330 }
331 
332 /*
333  *      Find a unique LCI for a given device.
334  */
335 static unsigned int x25_new_lci(struct x25_neigh *nb)
336 {
337         unsigned int lci = 1;
338         struct sock *sk;
339 
340         while ((sk = x25_find_socket(lci, nb)) != NULL) {
341                 sock_put(sk);
342                 if (++lci == 4096) {
343                         lci = 0;
344                         break;
345                 }
346                 cond_resched();
347         }
348 
349         return lci;
350 }
351 
352 /*
353  *      Deferred destroy.
354  */
355 static void __x25_destroy_socket(struct sock *);
356 
357 /*
358  *      handler for deferred kills.
359  */
360 static void x25_destroy_timer(struct timer_list *t)
361 {
362         struct sock *sk = from_timer(sk, t, sk_timer);
363 
364         x25_destroy_socket_from_timer(sk);
365 }
366 
367 /*
368  *      This is called from user mode and the timers. Thus it protects itself
369  *      against interrupting users but doesn't worry about being called during
370  *      work. Once it is removed from the queue no interrupt or bottom half
371  *      will touch it and we are (fairly 8-) ) safe.
372  *      Not static as it's used by the timer
373  */
374 static void __x25_destroy_socket(struct sock *sk)
375 {
376         struct sk_buff *skb;
377 
378         x25_stop_heartbeat(sk);
379         x25_stop_timer(sk);
380 
381         x25_remove_socket(sk);
382         x25_clear_queues(sk);           /* Flush the queues */
383 
384         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
385                 if (skb->sk != sk) {            /* A pending connection */
386                         /*
387                          * Queue the unaccepted socket for death
388                          */
389                         skb->sk->sk_state = TCP_LISTEN;
390                         sock_set_flag(skb->sk, SOCK_DEAD);
391                         x25_start_heartbeat(skb->sk);
392                         x25_sk(skb->sk)->state = X25_STATE_0;
393                 }
394 
395                 kfree_skb(skb);
396         }
397 
398         if (sk_has_allocations(sk)) {
399                 /* Defer: outstanding buffers */
400                 sk->sk_timer.expires  = jiffies + 10 * HZ;
401                 sk->sk_timer.function = x25_destroy_timer;
402                 add_timer(&sk->sk_timer);
403         } else {
404                 /* drop last reference so sock_put will free */
405                 __sock_put(sk);
406         }
407 }
408 
409 void x25_destroy_socket_from_timer(struct sock *sk)
410 {
411         sock_hold(sk);
412         bh_lock_sock(sk);
413         __x25_destroy_socket(sk);
414         bh_unlock_sock(sk);
415         sock_put(sk);
416 }
417 
418 /*
419  *      Handling for system calls applied via the various interfaces to a
420  *      X.25 socket object.
421  */
422 
423 static int x25_setsockopt(struct socket *sock, int level, int optname,
424                           sockptr_t optval, unsigned int optlen)
425 {
426         int opt;
427         struct sock *sk = sock->sk;
428         int rc = -ENOPROTOOPT;
429 
430         if (level != SOL_X25 || optname != X25_QBITINCL)
431                 goto out;
432 
433         rc = -EINVAL;
434         if (optlen < sizeof(int))
435                 goto out;
436 
437         rc = -EFAULT;
438         if (copy_from_sockptr(&opt, optval, sizeof(int)))
439                 goto out;
440 
441         if (opt)
442                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
443         else
444                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
445         rc = 0;
446 out:
447         return rc;
448 }
449 
450 static int x25_getsockopt(struct socket *sock, int level, int optname,
451                           char __user *optval, int __user *optlen)
452 {
453         struct sock *sk = sock->sk;
454         int val, len, rc = -ENOPROTOOPT;
455 
456         if (level != SOL_X25 || optname != X25_QBITINCL)
457                 goto out;
458 
459         rc = -EFAULT;
460         if (get_user(len, optlen))
461                 goto out;
462 
463         len = min_t(unsigned int, len, sizeof(int));
464 
465         rc = -EINVAL;
466         if (len < 0)
467                 goto out;
468 
469         rc = -EFAULT;
470         if (put_user(len, optlen))
471                 goto out;
472 
473         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
474         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
475 out:
476         return rc;
477 }
478 
479 static int x25_listen(struct socket *sock, int backlog)
480 {
481         struct sock *sk = sock->sk;
482         int rc = -EOPNOTSUPP;
483 
484         lock_sock(sk);
485         if (sk->sk_state != TCP_LISTEN) {
486                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
487                 sk->sk_max_ack_backlog = backlog;
488                 sk->sk_state           = TCP_LISTEN;
489                 rc = 0;
490         }
491         release_sock(sk);
492 
493         return rc;
494 }
495 
496 static struct proto x25_proto = {
497         .name     = "X25",
498         .owner    = THIS_MODULE,
499         .obj_size = sizeof(struct x25_sock),
500 };
501 
502 static struct sock *x25_alloc_socket(struct net *net, int kern)
503 {
504         struct x25_sock *x25;
505         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
506 
507         if (!sk)
508                 goto out;
509 
510         sock_init_data(NULL, sk);
511 
512         x25 = x25_sk(sk);
513         skb_queue_head_init(&x25->ack_queue);
514         skb_queue_head_init(&x25->fragment_queue);
515         skb_queue_head_init(&x25->interrupt_in_queue);
516         skb_queue_head_init(&x25->interrupt_out_queue);
517 out:
518         return sk;
519 }
520 
521 static int x25_create(struct net *net, struct socket *sock, int protocol,
522                       int kern)
523 {
524         struct sock *sk;
525         struct x25_sock *x25;
526         int rc = -EAFNOSUPPORT;
527 
528         if (!net_eq(net, &init_net))
529                 goto out;
530 
531         rc = -ESOCKTNOSUPPORT;
532         if (sock->type != SOCK_SEQPACKET)
533                 goto out;
534 
535         rc = -EINVAL;
536         if (protocol)
537                 goto out;
538 
539         rc = -ENOMEM;
540         if ((sk = x25_alloc_socket(net, kern)) == NULL)
541                 goto out;
542 
543         x25 = x25_sk(sk);
544 
545         sock_init_data(sock, sk);
546 
547         x25_init_timers(sk);
548 
549         sock->ops    = &x25_proto_ops;
550         sk->sk_protocol = protocol;
551         sk->sk_backlog_rcv = x25_backlog_rcv;
552 
553         x25->t21   = sysctl_x25_call_request_timeout;
554         x25->t22   = sysctl_x25_reset_request_timeout;
555         x25->t23   = sysctl_x25_clear_request_timeout;
556         x25->t2    = sysctl_x25_ack_holdback_timeout;
557         x25->state = X25_STATE_0;
558         x25->cudmatchlength = 0;
559         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
560                                                         /* on call accept   */
561 
562         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
563         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
564         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
565         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
566         x25->facilities.throughput  = 0;        /* by default don't negotiate
567                                                    throughput */
568         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
569         x25->dte_facilities.calling_len = 0;
570         x25->dte_facilities.called_len = 0;
571         memset(x25->dte_facilities.called_ae, '\0',
572                         sizeof(x25->dte_facilities.called_ae));
573         memset(x25->dte_facilities.calling_ae, '\0',
574                         sizeof(x25->dte_facilities.calling_ae));
575 
576         rc = 0;
577 out:
578         return rc;
579 }
580 
581 static struct sock *x25_make_new(struct sock *osk)
582 {
583         struct sock *sk = NULL;
584         struct x25_sock *x25, *ox25;
585 
586         if (osk->sk_type != SOCK_SEQPACKET)
587                 goto out;
588 
589         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
590                 goto out;
591 
592         x25 = x25_sk(sk);
593 
594         sk->sk_type        = osk->sk_type;
595         sk->sk_priority    = osk->sk_priority;
596         sk->sk_protocol    = osk->sk_protocol;
597         sk->sk_rcvbuf      = osk->sk_rcvbuf;
598         sk->sk_sndbuf      = osk->sk_sndbuf;
599         sk->sk_state       = TCP_ESTABLISHED;
600         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
601         sock_copy_flags(sk, osk);
602 
603         ox25 = x25_sk(osk);
604         x25->t21        = ox25->t21;
605         x25->t22        = ox25->t22;
606         x25->t23        = ox25->t23;
607         x25->t2         = ox25->t2;
608         x25->flags      = ox25->flags;
609         x25->facilities = ox25->facilities;
610         x25->dte_facilities = ox25->dte_facilities;
611         x25->cudmatchlength = ox25->cudmatchlength;
612 
613         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
614         x25_init_timers(sk);
615 out:
616         return sk;
617 }
618 
619 static int x25_release(struct socket *sock)
620 {
621         struct sock *sk = sock->sk;
622         struct x25_sock *x25;
623 
624         if (!sk)
625                 return 0;
626 
627         x25 = x25_sk(sk);
628 
629         sock_hold(sk);
630         lock_sock(sk);
631         switch (x25->state) {
632 
633                 case X25_STATE_0:
634                 case X25_STATE_2:
635                         x25_disconnect(sk, 0, 0, 0);
636                         __x25_destroy_socket(sk);
637                         goto out;
638 
639                 case X25_STATE_1:
640                 case X25_STATE_3:
641                 case X25_STATE_4:
642                         x25_clear_queues(sk);
643                         x25_write_internal(sk, X25_CLEAR_REQUEST);
644                         x25_start_t23timer(sk);
645                         x25->state = X25_STATE_2;
646                         sk->sk_state    = TCP_CLOSE;
647                         sk->sk_shutdown |= SEND_SHUTDOWN;
648                         sk->sk_state_change(sk);
649                         sock_set_flag(sk, SOCK_DEAD);
650                         sock_set_flag(sk, SOCK_DESTROY);
651                         break;
652 
653                 case X25_STATE_5:
654                         x25_write_internal(sk, X25_CLEAR_REQUEST);
655                         x25_disconnect(sk, 0, 0, 0);
656                         __x25_destroy_socket(sk);
657                         goto out;
658         }
659 
660         sock_orphan(sk);
661 out:
662         release_sock(sk);
663         sock_put(sk);
664         return 0;
665 }
666 
667 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
668 {
669         struct sock *sk = sock->sk;
670         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
671         int len, i, rc = 0;
672 
673         if (addr_len != sizeof(struct sockaddr_x25) ||
674             addr->sx25_family != AF_X25 ||
675             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
676                 rc = -EINVAL;
677                 goto out;
678         }
679 
680         /* check for the null_x25_address */
681         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
682 
683                 len = strlen(addr->sx25_addr.x25_addr);
684                 for (i = 0; i < len; i++) {
685                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
686                                 rc = -EINVAL;
687                                 goto out;
688                         }
689                 }
690         }
691 
692         lock_sock(sk);
693         if (sock_flag(sk, SOCK_ZAPPED)) {
694                 x25_sk(sk)->source_addr = addr->sx25_addr;
695                 x25_insert_socket(sk);
696                 sock_reset_flag(sk, SOCK_ZAPPED);
697         } else {
698                 rc = -EINVAL;
699         }
700         release_sock(sk);
701         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
702 out:
703         return rc;
704 }
705 
706 static int x25_wait_for_connection_establishment(struct sock *sk)
707 {
708         DECLARE_WAITQUEUE(wait, current);
709         int rc;
710 
711         add_wait_queue_exclusive(sk_sleep(sk), &wait);
712         for (;;) {
713                 __set_current_state(TASK_INTERRUPTIBLE);
714                 rc = -ERESTARTSYS;
715                 if (signal_pending(current))
716                         break;
717                 rc = sock_error(sk);
718                 if (rc) {
719                         sk->sk_socket->state = SS_UNCONNECTED;
720                         break;
721                 }
722                 rc = 0;
723                 if (sk->sk_state != TCP_ESTABLISHED) {
724                         release_sock(sk);
725                         schedule();
726                         lock_sock(sk);
727                 } else
728                         break;
729         }
730         __set_current_state(TASK_RUNNING);
731         remove_wait_queue(sk_sleep(sk), &wait);
732         return rc;
733 }
734 
735 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
736                        int addr_len, int flags)
737 {
738         struct sock *sk = sock->sk;
739         struct x25_sock *x25 = x25_sk(sk);
740         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
741         struct x25_route *rt;
742         int rc = 0;
743 
744         lock_sock(sk);
745         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
746                 sock->state = SS_CONNECTED;
747                 goto out; /* Connect completed during a ERESTARTSYS event */
748         }
749 
750         rc = -ECONNREFUSED;
751         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
752                 sock->state = SS_UNCONNECTED;
753                 goto out;
754         }
755 
756         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
757         if (sk->sk_state == TCP_ESTABLISHED)
758                 goto out;
759 
760         rc = -EALREADY; /* Do nothing if call is already in progress */
761         if (sk->sk_state == TCP_SYN_SENT)
762                 goto out;
763 
764         sk->sk_state   = TCP_CLOSE;
765         sock->state = SS_UNCONNECTED;
766 
767         rc = -EINVAL;
768         if (addr_len != sizeof(struct sockaddr_x25) ||
769             addr->sx25_family != AF_X25 ||
770             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
771                 goto out;
772 
773         rc = -ENETUNREACH;
774         rt = x25_get_route(&addr->sx25_addr);
775         if (!rt)
776                 goto out;
777 
778         x25->neighbour = x25_get_neigh(rt->dev);
779         if (!x25->neighbour)
780                 goto out_put_route;
781 
782         x25_limit_facilities(&x25->facilities, x25->neighbour);
783 
784         x25->lci = x25_new_lci(x25->neighbour);
785         if (!x25->lci)
786                 goto out_put_neigh;
787 
788         rc = -EINVAL;
789         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
790                 goto out_put_neigh;
791 
792         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
793                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
794 
795         x25->dest_addr = addr->sx25_addr;
796 
797         /* Move to connecting socket, start sending Connect Requests */
798         sock->state   = SS_CONNECTING;
799         sk->sk_state  = TCP_SYN_SENT;
800 
801         x25->state = X25_STATE_1;
802 
803         x25_write_internal(sk, X25_CALL_REQUEST);
804 
805         x25_start_heartbeat(sk);
806         x25_start_t21timer(sk);
807 
808         /* Now the loop */
809         rc = -EINPROGRESS;
810         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
811                 goto out;
812 
813         rc = x25_wait_for_connection_establishment(sk);
814         if (rc)
815                 goto out_put_neigh;
816 
817         sock->state = SS_CONNECTED;
818         rc = 0;
819 out_put_neigh:
820         if (rc && x25->neighbour) {
821                 read_lock_bh(&x25_list_lock);
822                 x25_neigh_put(x25->neighbour);
823                 x25->neighbour = NULL;
824                 read_unlock_bh(&x25_list_lock);
825                 x25->state = X25_STATE_0;
826         }
827 out_put_route:
828         x25_route_put(rt);
829 out:
830         release_sock(sk);
831         return rc;
832 }
833 
834 static int x25_wait_for_data(struct sock *sk, long timeout)
835 {
836         DECLARE_WAITQUEUE(wait, current);
837         int rc = 0;
838 
839         add_wait_queue_exclusive(sk_sleep(sk), &wait);
840         for (;;) {
841                 __set_current_state(TASK_INTERRUPTIBLE);
842                 if (sk->sk_shutdown & RCV_SHUTDOWN)
843                         break;
844                 rc = -ERESTARTSYS;
845                 if (signal_pending(current))
846                         break;
847                 rc = -EAGAIN;
848                 if (!timeout)
849                         break;
850                 rc = 0;
851                 if (skb_queue_empty(&sk->sk_receive_queue)) {
852                         release_sock(sk);
853                         timeout = schedule_timeout(timeout);
854                         lock_sock(sk);
855                 } else
856                         break;
857         }
858         __set_current_state(TASK_RUNNING);
859         remove_wait_queue(sk_sleep(sk), &wait);
860         return rc;
861 }
862 
863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
864                       bool kern)
865 {
866         struct sock *sk = sock->sk;
867         struct sock *newsk;
868         struct sk_buff *skb;
869         int rc = -EINVAL;
870 
871         if (!sk)
872                 goto out;
873 
874         rc = -EOPNOTSUPP;
875         if (sk->sk_type != SOCK_SEQPACKET)
876                 goto out;
877 
878         lock_sock(sk);
879         rc = -EINVAL;
880         if (sk->sk_state != TCP_LISTEN)
881                 goto out2;
882 
883         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
884         if (rc)
885                 goto out2;
886         skb = skb_dequeue(&sk->sk_receive_queue);
887         rc = -EINVAL;
888         if (!skb->sk)
889                 goto out2;
890         newsk            = skb->sk;
891         sock_graft(newsk, newsock);
892 
893         /* Now attach up the new socket */
894         skb->sk = NULL;
895         kfree_skb(skb);
896         sk_acceptq_removed(sk);
897         newsock->state = SS_CONNECTED;
898         rc = 0;
899 out2:
900         release_sock(sk);
901 out:
902         return rc;
903 }
904 
905 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
906                        int peer)
907 {
908         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
909         struct sock *sk = sock->sk;
910         struct x25_sock *x25 = x25_sk(sk);
911         int rc = 0;
912 
913         if (peer) {
914                 if (sk->sk_state != TCP_ESTABLISHED) {
915                         rc = -ENOTCONN;
916                         goto out;
917                 }
918                 sx25->sx25_addr = x25->dest_addr;
919         } else
920                 sx25->sx25_addr = x25->source_addr;
921 
922         sx25->sx25_family = AF_X25;
923         rc = sizeof(*sx25);
924 
925 out:
926         return rc;
927 }
928 
929 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
930                         unsigned int lci)
931 {
932         struct sock *sk;
933         struct sock *make;
934         struct x25_sock *makex25;
935         struct x25_address source_addr, dest_addr;
936         struct x25_facilities facilities;
937         struct x25_dte_facilities dte_facilities;
938         int len, addr_len, rc;
939 
940         /*
941          *      Remove the LCI and frame type.
942          */
943         skb_pull(skb, X25_STD_MIN_LEN);
944 
945         /*
946          *      Extract the X.25 addresses and convert them to ASCII strings,
947          *      and remove them.
948          *
949          *      Address block is mandatory in call request packets
950          */
951         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
952         if (addr_len <= 0)
953                 goto out_clear_request;
954         skb_pull(skb, addr_len);
955 
956         /*
957          *      Get the length of the facilities, skip past them for the moment
958          *      get the call user data because this is needed to determine
959          *      the correct listener
960          *
961          *      Facilities length is mandatory in call request packets
962          */
963         if (!pskb_may_pull(skb, 1))
964                 goto out_clear_request;
965         len = skb->data[0] + 1;
966         if (!pskb_may_pull(skb, len))
967                 goto out_clear_request;
968         skb_pull(skb,len);
969 
970         /*
971          *      Ensure that the amount of call user data is valid.
972          */
973         if (skb->len > X25_MAX_CUD_LEN)
974                 goto out_clear_request;
975 
976         /*
977          *      Get all the call user data so it can be used in
978          *      x25_find_listener and skb_copy_from_linear_data up ahead.
979          */
980         if (!pskb_may_pull(skb, skb->len))
981                 goto out_clear_request;
982 
983         /*
984          *      Find a listener for the particular address/cud pair.
985          */
986         sk = x25_find_listener(&source_addr,skb);
987         skb_push(skb,len);
988 
989         if (sk != NULL && sk_acceptq_is_full(sk)) {
990                 goto out_sock_put;
991         }
992 
993         /*
994          *      We dont have any listeners for this incoming call.
995          *      Try forwarding it.
996          */
997         if (sk == NULL) {
998                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
999                 if (sysctl_x25_forward &&
1000                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1001                 {
1002                         /* Call was forwarded, dont process it any more */
1003                         kfree_skb(skb);
1004                         rc = 1;
1005                         goto out;
1006                 } else {
1007                         /* No listeners, can't forward, clear the call */
1008                         goto out_clear_request;
1009                 }
1010         }
1011 
1012         /*
1013          *      Try to reach a compromise on the requested facilities.
1014          */
1015         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1016         if (len == -1)
1017                 goto out_sock_put;
1018 
1019         /*
1020          * current neighbour/link might impose additional limits
1021          * on certain facilities
1022          */
1023 
1024         x25_limit_facilities(&facilities, nb);
1025 
1026         /*
1027          *      Try to create a new socket.
1028          */
1029         make = x25_make_new(sk);
1030         if (!make)
1031                 goto out_sock_put;
1032 
1033         /*
1034          *      Remove the facilities
1035          */
1036         skb_pull(skb, len);
1037 
1038         skb->sk     = make;
1039         make->sk_state = TCP_ESTABLISHED;
1040 
1041         makex25 = x25_sk(make);
1042         makex25->lci           = lci;
1043         makex25->dest_addr     = dest_addr;
1044         makex25->source_addr   = source_addr;
1045         x25_neigh_hold(nb);
1046         makex25->neighbour     = nb;
1047         makex25->facilities    = facilities;
1048         makex25->dte_facilities= dte_facilities;
1049         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1050         /* ensure no reverse facil on accept */
1051         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1052         /* ensure no calling address extension on accept */
1053         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1054         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1055 
1056         /* Normally all calls are accepted immediately */
1057         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1058                 x25_write_internal(make, X25_CALL_ACCEPTED);
1059                 makex25->state = X25_STATE_3;
1060         } else {
1061                 makex25->state = X25_STATE_5;
1062         }
1063 
1064         /*
1065          *      Incoming Call User Data.
1066          */
1067         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1068         makex25->calluserdata.cudlength = skb->len;
1069 
1070         sk_acceptq_added(sk);
1071 
1072         x25_insert_socket(make);
1073 
1074         skb_queue_head(&sk->sk_receive_queue, skb);
1075 
1076         x25_start_heartbeat(make);
1077 
1078         if (!sock_flag(sk, SOCK_DEAD))
1079                 sk->sk_data_ready(sk);
1080         rc = 1;
1081         sock_put(sk);
1082 out:
1083         return rc;
1084 out_sock_put:
1085         sock_put(sk);
1086 out_clear_request:
1087         rc = 0;
1088         x25_transmit_clear_request(nb, lci, 0x01);
1089         goto out;
1090 }
1091 
1092 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1093 {
1094         struct sock *sk = sock->sk;
1095         struct x25_sock *x25 = x25_sk(sk);
1096         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1097         struct sockaddr_x25 sx25;
1098         struct sk_buff *skb;
1099         unsigned char *asmptr;
1100         int noblock = msg->msg_flags & MSG_DONTWAIT;
1101         size_t size;
1102         int qbit = 0, rc = -EINVAL;
1103 
1104         lock_sock(sk);
1105         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106                 goto out;
1107 
1108         /* we currently don't support segmented records at the user interface */
1109         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110                 goto out;
1111 
1112         rc = -EADDRNOTAVAIL;
1113         if (sock_flag(sk, SOCK_ZAPPED))
1114                 goto out;
1115 
1116         rc = -EPIPE;
1117         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118                 send_sig(SIGPIPE, current, 0);
1119                 goto out;
1120         }
1121 
1122         rc = -ENETUNREACH;
1123         if (!x25->neighbour)
1124                 goto out;
1125 
1126         if (usx25) {
1127                 rc = -EINVAL;
1128                 if (msg->msg_namelen < sizeof(sx25))
1129                         goto out;
1130                 memcpy(&sx25, usx25, sizeof(sx25));
1131                 rc = -EISCONN;
1132                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133                         goto out;
1134                 rc = -EINVAL;
1135                 if (sx25.sx25_family != AF_X25)
1136                         goto out;
1137         } else {
1138                 /*
1139                  *      FIXME 1003.1g - if the socket is like this because
1140                  *      it has become closed (not started closed) we ought
1141                  *      to SIGPIPE, EPIPE;
1142                  */
1143                 rc = -ENOTCONN;
1144                 if (sk->sk_state != TCP_ESTABLISHED)
1145                         goto out;
1146 
1147                 sx25.sx25_family = AF_X25;
1148                 sx25.sx25_addr   = x25->dest_addr;
1149         }
1150 
1151         /* Sanity check the packet size */
1152         if (len > 65535) {
1153                 rc = -EMSGSIZE;
1154                 goto out;
1155         }
1156 
1157         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158 
1159         /* Build a packet */
1160         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161 
1162         if ((msg->msg_flags & MSG_OOB) && len > 32)
1163                 len = 32;
1164 
1165         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166 
1167         release_sock(sk);
1168         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1169         lock_sock(sk);
1170         if (!skb)
1171                 goto out;
1172         X25_SKB_CB(skb)->flags = msg->msg_flags;
1173 
1174         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175 
1176         /*
1177          *      Put the data on the end
1178          */
1179         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1180 
1181         skb_reset_transport_header(skb);
1182         skb_put(skb, len);
1183 
1184         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1185         if (rc)
1186                 goto out_kfree_skb;
1187 
1188         /*
1189          *      If the Q BIT Include socket option is in force, the first
1190          *      byte of the user data is the logical value of the Q Bit.
1191          */
1192         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1193                 if (!pskb_may_pull(skb, 1))
1194                         goto out_kfree_skb;
1195 
1196                 qbit = skb->data[0];
1197                 skb_pull(skb, 1);
1198         }
1199 
1200         /*
1201          *      Push down the X.25 header
1202          */
1203         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1204 
1205         if (msg->msg_flags & MSG_OOB) {
1206                 if (x25->neighbour->extended) {
1207                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1208                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1210                         *asmptr++ = X25_INTERRUPT;
1211                 } else {
1212                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1213                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1214                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1215                         *asmptr++ = X25_INTERRUPT;
1216                 }
1217         } else {
1218                 if (x25->neighbour->extended) {
1219                         /* Build an Extended X.25 header */
1220                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1221                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1222                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1223                         *asmptr++ = X25_DATA;
1224                         *asmptr++ = X25_DATA;
1225                 } else {
1226                         /* Build an Standard X.25 header */
1227                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1228                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1229                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1230                         *asmptr++ = X25_DATA;
1231                 }
1232 
1233                 if (qbit)
1234                         skb->data[0] |= X25_Q_BIT;
1235         }
1236 
1237         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1238         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1239 
1240         rc = -ENOTCONN;
1241         if (sk->sk_state != TCP_ESTABLISHED)
1242                 goto out_kfree_skb;
1243 
1244         if (msg->msg_flags & MSG_OOB)
1245                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1246         else {
1247                 rc = x25_output(sk, skb);
1248                 len = rc;
1249                 if (rc < 0)
1250                         kfree_skb(skb);
1251                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1252                         len++;
1253         }
1254 
1255         x25_kick(sk);
1256         rc = len;
1257 out:
1258         release_sock(sk);
1259         return rc;
1260 out_kfree_skb:
1261         kfree_skb(skb);
1262         goto out;
1263 }
1264 
1265 
1266 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1267                        int flags)
1268 {
1269         struct sock *sk = sock->sk;
1270         struct x25_sock *x25 = x25_sk(sk);
1271         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1272         size_t copied;
1273         int qbit, header_len;
1274         struct sk_buff *skb;
1275         unsigned char *asmptr;
1276         int rc = -ENOTCONN;
1277 
1278         lock_sock(sk);
1279 
1280         if (x25->neighbour == NULL)
1281                 goto out;
1282 
1283         header_len = x25->neighbour->extended ?
1284                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1285 
1286         /*
1287          * This works for seqpacket too. The receiver has ordered the queue for
1288          * us! We do one quick check first though
1289          */
1290         if (sk->sk_state != TCP_ESTABLISHED)
1291                 goto out;
1292 
1293         if (flags & MSG_OOB) {
1294                 rc = -EINVAL;
1295                 if (sock_flag(sk, SOCK_URGINLINE) ||
1296                     !skb_peek(&x25->interrupt_in_queue))
1297                         goto out;
1298 
1299                 skb = skb_dequeue(&x25->interrupt_in_queue);
1300 
1301                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1302                         goto out_free_dgram;
1303 
1304                 skb_pull(skb, X25_STD_MIN_LEN);
1305 
1306                 /*
1307                  *      No Q bit information on Interrupt data.
1308                  */
1309                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1310                         asmptr  = skb_push(skb, 1);
1311                         *asmptr = 0x00;
1312                 }
1313 
1314                 msg->msg_flags |= MSG_OOB;
1315         } else {
1316                 /* Now we can treat all alike */
1317                 release_sock(sk);
1318                 skb = skb_recv_datagram(sk, flags, &rc);
1319                 lock_sock(sk);
1320                 if (!skb)
1321                         goto out;
1322 
1323                 if (!pskb_may_pull(skb, header_len))
1324                         goto out_free_dgram;
1325 
1326                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1327 
1328                 skb_pull(skb, header_len);
1329 
1330                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1331                         asmptr  = skb_push(skb, 1);
1332                         *asmptr = qbit;
1333                 }
1334         }
1335 
1336         skb_reset_transport_header(skb);
1337         copied = skb->len;
1338 
1339         if (copied > size) {
1340                 copied = size;
1341                 msg->msg_flags |= MSG_TRUNC;
1342         }
1343 
1344         /* Currently, each datagram always contains a complete record */
1345         msg->msg_flags |= MSG_EOR;
1346 
1347         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1348         if (rc)
1349                 goto out_free_dgram;
1350 
1351         if (sx25) {
1352                 sx25->sx25_family = AF_X25;
1353                 sx25->sx25_addr   = x25->dest_addr;
1354                 msg->msg_namelen = sizeof(*sx25);
1355         }
1356 
1357         x25_check_rbuf(sk);
1358         rc = copied;
1359 out_free_dgram:
1360         skb_free_datagram(sk, skb);
1361 out:
1362         release_sock(sk);
1363         return rc;
1364 }
1365 
1366 
1367 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1368 {
1369         struct sock *sk = sock->sk;
1370         struct x25_sock *x25 = x25_sk(sk);
1371         void __user *argp = (void __user *)arg;
1372         int rc;
1373 
1374         switch (cmd) {
1375         case TIOCOUTQ: {
1376                 int amount;
1377 
1378                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1379                 if (amount < 0)
1380                         amount = 0;
1381                 rc = put_user(amount, (unsigned int __user *)argp);
1382                 break;
1383         }
1384 
1385         case TIOCINQ: {
1386                 struct sk_buff *skb;
1387                 int amount = 0;
1388                 /*
1389                  * These two are safe on a single CPU system as
1390                  * only user tasks fiddle here
1391                  */
1392                 lock_sock(sk);
1393                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1394                         amount = skb->len;
1395                 release_sock(sk);
1396                 rc = put_user(amount, (unsigned int __user *)argp);
1397                 break;
1398         }
1399 
1400         case SIOCGIFADDR:
1401         case SIOCSIFADDR:
1402         case SIOCGIFDSTADDR:
1403         case SIOCSIFDSTADDR:
1404         case SIOCGIFBRDADDR:
1405         case SIOCSIFBRDADDR:
1406         case SIOCGIFNETMASK:
1407         case SIOCSIFNETMASK:
1408         case SIOCGIFMETRIC:
1409         case SIOCSIFMETRIC:
1410                 rc = -EINVAL;
1411                 break;
1412         case SIOCADDRT:
1413         case SIOCDELRT:
1414                 rc = -EPERM;
1415                 if (!capable(CAP_NET_ADMIN))
1416                         break;
1417                 rc = x25_route_ioctl(cmd, argp);
1418                 break;
1419         case SIOCX25GSUBSCRIP:
1420                 rc = x25_subscr_ioctl(cmd, argp);
1421                 break;
1422         case SIOCX25SSUBSCRIP:
1423                 rc = -EPERM;
1424                 if (!capable(CAP_NET_ADMIN))
1425                         break;
1426                 rc = x25_subscr_ioctl(cmd, argp);
1427                 break;
1428         case SIOCX25GFACILITIES: {
1429                 lock_sock(sk);
1430                 rc = copy_to_user(argp, &x25->facilities,
1431                                   sizeof(x25->facilities))
1432                         ? -EFAULT : 0;
1433                 release_sock(sk);
1434                 break;
1435         }
1436 
1437         case SIOCX25SFACILITIES: {
1438                 struct x25_facilities facilities;
1439                 rc = -EFAULT;
1440                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1441                         break;
1442                 rc = -EINVAL;
1443                 lock_sock(sk);
1444                 if (sk->sk_state != TCP_LISTEN &&
1445                     sk->sk_state != TCP_CLOSE)
1446                         goto out_fac_release;
1447                 if (facilities.pacsize_in < X25_PS16 ||
1448                     facilities.pacsize_in > X25_PS4096)
1449                         goto out_fac_release;
1450                 if (facilities.pacsize_out < X25_PS16 ||
1451                     facilities.pacsize_out > X25_PS4096)
1452                         goto out_fac_release;
1453                 if (facilities.winsize_in < 1 ||
1454                     facilities.winsize_in > 127)
1455                         goto out_fac_release;
1456                 if (facilities.throughput) {
1457                         int out = facilities.throughput & 0xf0;
1458                         int in  = facilities.throughput & 0x0f;
1459                         if (!out)
1460                                 facilities.throughput |=
1461                                         X25_DEFAULT_THROUGHPUT << 4;
1462                         else if (out < 0x30 || out > 0xD0)
1463                                 goto out_fac_release;
1464                         if (!in)
1465                                 facilities.throughput |=
1466                                         X25_DEFAULT_THROUGHPUT;
1467                         else if (in < 0x03 || in > 0x0D)
1468                                 goto out_fac_release;
1469                 }
1470                 if (facilities.reverse &&
1471                     (facilities.reverse & 0x81) != 0x81)
1472                         goto out_fac_release;
1473                 x25->facilities = facilities;
1474                 rc = 0;
1475 out_fac_release:
1476                 release_sock(sk);
1477                 break;
1478         }
1479 
1480         case SIOCX25GDTEFACILITIES: {
1481                 lock_sock(sk);
1482                 rc = copy_to_user(argp, &x25->dte_facilities,
1483                                   sizeof(x25->dte_facilities));
1484                 release_sock(sk);
1485                 if (rc)
1486                         rc = -EFAULT;
1487                 break;
1488         }
1489 
1490         case SIOCX25SDTEFACILITIES: {
1491                 struct x25_dte_facilities dtefacs;
1492                 rc = -EFAULT;
1493                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1494                         break;
1495                 rc = -EINVAL;
1496                 lock_sock(sk);
1497                 if (sk->sk_state != TCP_LISTEN &&
1498                     sk->sk_state != TCP_CLOSE)
1499                         goto out_dtefac_release;
1500                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1501                         goto out_dtefac_release;
1502                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1503                         goto out_dtefac_release;
1504                 x25->dte_facilities = dtefacs;
1505                 rc = 0;
1506 out_dtefac_release:
1507                 release_sock(sk);
1508                 break;
1509         }
1510 
1511         case SIOCX25GCALLUSERDATA: {
1512                 lock_sock(sk);
1513                 rc = copy_to_user(argp, &x25->calluserdata,
1514                                   sizeof(x25->calluserdata))
1515                         ? -EFAULT : 0;
1516                 release_sock(sk);
1517                 break;
1518         }
1519 
1520         case SIOCX25SCALLUSERDATA: {
1521                 struct x25_calluserdata calluserdata;
1522 
1523                 rc = -EFAULT;
1524                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1525                         break;
1526                 rc = -EINVAL;
1527                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1528                         break;
1529                 lock_sock(sk);
1530                 x25->calluserdata = calluserdata;
1531                 release_sock(sk);
1532                 rc = 0;
1533                 break;
1534         }
1535 
1536         case SIOCX25GCAUSEDIAG: {
1537                 lock_sock(sk);
1538                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1539                         ? -EFAULT : 0;
1540                 release_sock(sk);
1541                 break;
1542         }
1543 
1544         case SIOCX25SCAUSEDIAG: {
1545                 struct x25_causediag causediag;
1546                 rc = -EFAULT;
1547                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1548                         break;
1549                 lock_sock(sk);
1550                 x25->causediag = causediag;
1551                 release_sock(sk);
1552                 rc = 0;
1553                 break;
1554 
1555         }
1556 
1557         case SIOCX25SCUDMATCHLEN: {
1558                 struct x25_subaddr sub_addr;
1559                 rc = -EINVAL;
1560                 lock_sock(sk);
1561                 if(sk->sk_state != TCP_CLOSE)
1562                         goto out_cud_release;
1563                 rc = -EFAULT;
1564                 if (copy_from_user(&sub_addr, argp,
1565                                    sizeof(sub_addr)))
1566                         goto out_cud_release;
1567                 rc = -EINVAL;
1568                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1569                         goto out_cud_release;
1570                 x25->cudmatchlength = sub_addr.cudmatchlength;
1571                 rc = 0;
1572 out_cud_release:
1573                 release_sock(sk);
1574                 break;
1575         }
1576 
1577         case SIOCX25CALLACCPTAPPRV: {
1578                 rc = -EINVAL;
1579                 lock_sock(sk);
1580                 if (sk->sk_state == TCP_CLOSE) {
1581                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1582                         rc = 0;
1583                 }
1584                 release_sock(sk);
1585                 break;
1586         }
1587 
1588         case SIOCX25SENDCALLACCPT:  {
1589                 rc = -EINVAL;
1590                 lock_sock(sk);
1591                 if (sk->sk_state != TCP_ESTABLISHED)
1592                         goto out_sendcallaccpt_release;
1593                 /* must call accptapprv above */
1594                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1595                         goto out_sendcallaccpt_release;
1596                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1597                 x25->state = X25_STATE_3;
1598                 rc = 0;
1599 out_sendcallaccpt_release:
1600                 release_sock(sk);
1601                 break;
1602         }
1603 
1604         default:
1605                 rc = -ENOIOCTLCMD;
1606                 break;
1607         }
1608 
1609         return rc;
1610 }
1611 
1612 static const struct net_proto_family x25_family_ops = {
1613         .family =       AF_X25,
1614         .create =       x25_create,
1615         .owner  =       THIS_MODULE,
1616 };
1617 
1618 #ifdef CONFIG_COMPAT
1619 static int compat_x25_subscr_ioctl(unsigned int cmd,
1620                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1621 {
1622         struct compat_x25_subscrip_struct x25_subscr;
1623         struct x25_neigh *nb;
1624         struct net_device *dev;
1625         int rc = -EINVAL;
1626 
1627         rc = -EFAULT;
1628         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1629                 goto out;
1630 
1631         rc = -EINVAL;
1632         dev = x25_dev_get(x25_subscr.device);
1633         if (dev == NULL)
1634                 goto out;
1635 
1636         nb = x25_get_neigh(dev);
1637         if (nb == NULL)
1638                 goto out_dev_put;
1639 
1640         dev_put(dev);
1641 
1642         if (cmd == SIOCX25GSUBSCRIP) {
1643                 read_lock_bh(&x25_neigh_list_lock);
1644                 x25_subscr.extended = nb->extended;
1645                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1646                 read_unlock_bh(&x25_neigh_list_lock);
1647                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1648                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1649         } else {
1650                 rc = -EINVAL;
1651                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1652                         rc = 0;
1653                         write_lock_bh(&x25_neigh_list_lock);
1654                         nb->extended = x25_subscr.extended;
1655                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1656                         write_unlock_bh(&x25_neigh_list_lock);
1657                 }
1658         }
1659         x25_neigh_put(nb);
1660 out:
1661         return rc;
1662 out_dev_put:
1663         dev_put(dev);
1664         goto out;
1665 }
1666 
1667 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1668                                 unsigned long arg)
1669 {
1670         void __user *argp = compat_ptr(arg);
1671         int rc = -ENOIOCTLCMD;
1672 
1673         switch(cmd) {
1674         case TIOCOUTQ:
1675         case TIOCINQ:
1676                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1677                 break;
1678         case SIOCGIFADDR:
1679         case SIOCSIFADDR:
1680         case SIOCGIFDSTADDR:
1681         case SIOCSIFDSTADDR:
1682         case SIOCGIFBRDADDR:
1683         case SIOCSIFBRDADDR:
1684         case SIOCGIFNETMASK:
1685         case SIOCSIFNETMASK:
1686         case SIOCGIFMETRIC:
1687         case SIOCSIFMETRIC:
1688                 rc = -EINVAL;
1689                 break;
1690         case SIOCADDRT:
1691         case SIOCDELRT:
1692                 rc = -EPERM;
1693                 if (!capable(CAP_NET_ADMIN))
1694                         break;
1695                 rc = x25_route_ioctl(cmd, argp);
1696                 break;
1697         case SIOCX25GSUBSCRIP:
1698                 rc = compat_x25_subscr_ioctl(cmd, argp);
1699                 break;
1700         case SIOCX25SSUBSCRIP:
1701                 rc = -EPERM;
1702                 if (!capable(CAP_NET_ADMIN))
1703                         break;
1704                 rc = compat_x25_subscr_ioctl(cmd, argp);
1705                 break;
1706         case SIOCX25GFACILITIES:
1707         case SIOCX25SFACILITIES:
1708         case SIOCX25GDTEFACILITIES:
1709         case SIOCX25SDTEFACILITIES:
1710         case SIOCX25GCALLUSERDATA:
1711         case SIOCX25SCALLUSERDATA:
1712         case SIOCX25GCAUSEDIAG:
1713         case SIOCX25SCAUSEDIAG:
1714         case SIOCX25SCUDMATCHLEN:
1715         case SIOCX25CALLACCPTAPPRV:
1716         case SIOCX25SENDCALLACCPT:
1717                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1718                 break;
1719         default:
1720                 rc = -ENOIOCTLCMD;
1721                 break;
1722         }
1723         return rc;
1724 }
1725 #endif
1726 
1727 static const struct proto_ops x25_proto_ops = {
1728         .family =       AF_X25,
1729         .owner =        THIS_MODULE,
1730         .release =      x25_release,
1731         .bind =         x25_bind,
1732         .connect =      x25_connect,
1733         .socketpair =   sock_no_socketpair,
1734         .accept =       x25_accept,
1735         .getname =      x25_getname,
1736         .poll =         datagram_poll,
1737         .ioctl =        x25_ioctl,
1738 #ifdef CONFIG_COMPAT
1739         .compat_ioctl = compat_x25_ioctl,
1740 #endif
1741         .gettstamp =    sock_gettstamp,
1742         .listen =       x25_listen,
1743         .shutdown =     sock_no_shutdown,
1744         .setsockopt =   x25_setsockopt,
1745         .getsockopt =   x25_getsockopt,
1746         .sendmsg =      x25_sendmsg,
1747         .recvmsg =      x25_recvmsg,
1748         .mmap =         sock_no_mmap,
1749         .sendpage =     sock_no_sendpage,
1750 };
1751 
1752 static struct packet_type x25_packet_type __read_mostly = {
1753         .type = cpu_to_be16(ETH_P_X25),
1754         .func = x25_lapb_receive_frame,
1755 };
1756 
1757 static struct notifier_block x25_dev_notifier = {
1758         .notifier_call = x25_device_event,
1759 };
1760 
1761 void x25_kill_by_neigh(struct x25_neigh *nb)
1762 {
1763         struct sock *s;
1764 
1765         write_lock_bh(&x25_list_lock);
1766 
1767         sk_for_each(s, &x25_list) {
1768                 if (x25_sk(s)->neighbour == nb) {
1769                         write_unlock_bh(&x25_list_lock);
1770                         lock_sock(s);
1771                         x25_disconnect(s, ENETUNREACH, 0, 0);
1772                         release_sock(s);
1773                         write_lock_bh(&x25_list_lock);
1774                 }
1775         }
1776         write_unlock_bh(&x25_list_lock);
1777 
1778         /* Remove any related forwards */
1779         x25_clear_forward_by_dev(nb->dev);
1780 }
1781 
1782 static int __init x25_init(void)
1783 {
1784         int rc;
1785 
1786         rc = proto_register(&x25_proto, 0);
1787         if (rc)
1788                 goto out;
1789 
1790         rc = sock_register(&x25_family_ops);
1791         if (rc)
1792                 goto out_proto;
1793 
1794         dev_add_pack(&x25_packet_type);
1795 
1796         rc = register_netdevice_notifier(&x25_dev_notifier);
1797         if (rc)
1798                 goto out_sock;
1799 
1800         rc = x25_register_sysctl();
1801         if (rc)
1802                 goto out_dev;
1803 
1804         rc = x25_proc_init();
1805         if (rc)
1806                 goto out_sysctl;
1807 
1808         pr_info("Linux Version 0.2\n");
1809 
1810 out:
1811         return rc;
1812 out_sysctl:
1813         x25_unregister_sysctl();
1814 out_dev:
1815         unregister_netdevice_notifier(&x25_dev_notifier);
1816 out_sock:
1817         dev_remove_pack(&x25_packet_type);
1818         sock_unregister(AF_X25);
1819 out_proto:
1820         proto_unregister(&x25_proto);
1821         goto out;
1822 }
1823 module_init(x25_init);
1824 
1825 static void __exit x25_exit(void)
1826 {
1827         x25_proc_exit();
1828         x25_link_free();
1829         x25_route_free();
1830 
1831         x25_unregister_sysctl();
1832 
1833         unregister_netdevice_notifier(&x25_dev_notifier);
1834 
1835         dev_remove_pack(&x25_packet_type);
1836 
1837         sock_unregister(AF_X25);
1838         proto_unregister(&x25_proto);
1839 }
1840 module_exit(x25_exit);
1841 
1842 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1843 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1844 MODULE_LICENSE("GPL");
1845 MODULE_ALIAS_NETPROTO(PF_X25);
1846 

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