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Linux/net/x25/af_x25.c

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  1 /*
  2  *      X.25 Packet Layer release 002
  3  *
  4  *      This is ALPHA test software. This code may break your machine,
  5  *      randomly fail to work with new releases, misbehave and/or generally
  6  *      screw up. It might even work.
  7  *
  8  *      This code REQUIRES 2.1.15 or higher
  9  *
 10  *      This module:
 11  *              This module is free software; you can redistribute it and/or
 12  *              modify it under the terms of the GNU General Public License
 13  *              as published by the Free Software Foundation; either version
 14  *              2 of the License, or (at your option) any later version.
 15  *
 16  *      History
 17  *      X.25 001        Jonathan Naylor Started coding.
 18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
 19  *                                      New timer architecture.
 20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
 21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
 22  *                                        facilities negotiation and increased
 23  *                                        the throughput upper limit.
 24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
 25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
 26  *                                      Fixed x25_output() related skb leakage.
 27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
 28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
 29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
 30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
 31  *                                      x25_proc.c, using seq_file
 32  *      2005-04-02      Shaun Pereira   Selective sub address matching
 33  *                                      with call user data
 34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
 35  *                                      response
 36  */
 37 
 38 #include <linux/module.h>
 39 #include <linux/capability.h>
 40 #include <linux/errno.h>
 41 #include <linux/kernel.h>
 42 #include <linux/sched.h>
 43 #include <linux/timer.h>
 44 #include <linux/string.h>
 45 #include <linux/net.h>
 46 #include <linux/netdevice.h>
 47 #include <linux/if_arp.h>
 48 #include <linux/skbuff.h>
 49 #include <linux/slab.h>
 50 #include <net/sock.h>
 51 #include <net/tcp_states.h>
 52 #include <asm/uaccess.h>
 53 #include <linux/fcntl.h>
 54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
 55 #include <linux/notifier.h>
 56 #include <linux/init.h>
 57 #include <linux/compat.h>
 58 #include <linux/ctype.h>
 59 
 60 #include <net/x25.h>
 61 #include <net/compat.h>
 62 
 63 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
 64 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
 65 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
 66 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
 67 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
 68 int sysctl_x25_forward                 = 0;
 69 
 70 HLIST_HEAD(x25_list);
 71 DEFINE_RWLOCK(x25_list_lock);
 72 
 73 static const struct proto_ops x25_proto_ops;
 74 
 75 static struct x25_address null_x25_address = {"               "};
 76 
 77 #ifdef CONFIG_COMPAT
 78 struct compat_x25_subscrip_struct {
 79         char device[200-sizeof(compat_ulong_t)];
 80         compat_ulong_t global_facil_mask;
 81         compat_uint_t extended;
 82 };
 83 #endif
 84 
 85 
 86 int x25_parse_address_block(struct sk_buff *skb,
 87                 struct x25_address *called_addr,
 88                 struct x25_address *calling_addr)
 89 {
 90         unsigned char len;
 91         int needed;
 92         int rc;
 93 
 94         if (!pskb_may_pull(skb, 1)) {
 95                 /* packet has no address block */
 96                 rc = 0;
 97                 goto empty;
 98         }
 99 
100         len = *skb->data;
101         needed = 1 + (len >> 4) + (len & 0x0f);
102 
103         if (!pskb_may_pull(skb, needed)) {
104                 /* packet is too short to hold the addresses it claims
105                    to hold */
106                 rc = -1;
107                 goto empty;
108         }
109 
110         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
111 
112 empty:
113         *called_addr->x25_addr = 0;
114         *calling_addr->x25_addr = 0;
115 
116         return rc;
117 }
118 
119 
120 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
121                   struct x25_address *calling_addr)
122 {
123         unsigned int called_len, calling_len;
124         char *called, *calling;
125         unsigned int i;
126 
127         called_len  = (*p >> 0) & 0x0F;
128         calling_len = (*p >> 4) & 0x0F;
129 
130         called  = called_addr->x25_addr;
131         calling = calling_addr->x25_addr;
132         p++;
133 
134         for (i = 0; i < (called_len + calling_len); i++) {
135                 if (i < called_len) {
136                         if (i % 2 != 0) {
137                                 *called++ = ((*p >> 0) & 0x0F) + '';
138                                 p++;
139                         } else {
140                                 *called++ = ((*p >> 4) & 0x0F) + '';
141                         }
142                 } else {
143                         if (i % 2 != 0) {
144                                 *calling++ = ((*p >> 0) & 0x0F) + '';
145                                 p++;
146                         } else {
147                                 *calling++ = ((*p >> 4) & 0x0F) + '';
148                         }
149                 }
150         }
151 
152         *called = *calling = '\0';
153 
154         return 1 + (called_len + calling_len + 1) / 2;
155 }
156 
157 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
158                   struct x25_address *calling_addr)
159 {
160         unsigned int called_len, calling_len;
161         char *called, *calling;
162         int i;
163 
164         called  = called_addr->x25_addr;
165         calling = calling_addr->x25_addr;
166 
167         called_len  = strlen(called);
168         calling_len = strlen(calling);
169 
170         *p++ = (calling_len << 4) | (called_len << 0);
171 
172         for (i = 0; i < (called_len + calling_len); i++) {
173                 if (i < called_len) {
174                         if (i % 2 != 0) {
175                                 *p |= (*called++ - '') << 0;
176                                 p++;
177                         } else {
178                                 *p = 0x00;
179                                 *p |= (*called++ - '') << 4;
180                         }
181                 } else {
182                         if (i % 2 != 0) {
183                                 *p |= (*calling++ - '') << 0;
184                                 p++;
185                         } else {
186                                 *p = 0x00;
187                                 *p |= (*calling++ - '') << 4;
188                         }
189                 }
190         }
191 
192         return 1 + (called_len + calling_len + 1) / 2;
193 }
194 
195 /*
196  *      Socket removal during an interrupt is now safe.
197  */
198 static void x25_remove_socket(struct sock *sk)
199 {
200         write_lock_bh(&x25_list_lock);
201         sk_del_node_init(sk);
202         write_unlock_bh(&x25_list_lock);
203 }
204 
205 /*
206  *      Kill all bound sockets on a dropped device.
207  */
208 static void x25_kill_by_device(struct net_device *dev)
209 {
210         struct sock *s;
211         struct hlist_node *node;
212 
213         write_lock_bh(&x25_list_lock);
214 
215         sk_for_each(s, node, &x25_list)
216                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
217                         x25_disconnect(s, ENETUNREACH, 0, 0);
218 
219         write_unlock_bh(&x25_list_lock);
220 }
221 
222 /*
223  *      Handle device status changes.
224  */
225 static int x25_device_event(struct notifier_block *this, unsigned long event,
226                             void *ptr)
227 {
228         struct net_device *dev = ptr;
229         struct x25_neigh *nb;
230 
231         if (!net_eq(dev_net(dev), &init_net))
232                 return NOTIFY_DONE;
233 
234         if (dev->type == ARPHRD_X25
235 #if IS_ENABLED(CONFIG_LLC)
236          || dev->type == ARPHRD_ETHER
237 #endif
238          ) {
239                 switch (event) {
240                 case NETDEV_UP:
241                         x25_link_device_up(dev);
242                         break;
243                 case NETDEV_GOING_DOWN:
244                         nb = x25_get_neigh(dev);
245                         if (nb) {
246                                 x25_terminate_link(nb);
247                                 x25_neigh_put(nb);
248                         }
249                         break;
250                 case NETDEV_DOWN:
251                         x25_kill_by_device(dev);
252                         x25_route_device_down(dev);
253                         x25_link_device_down(dev);
254                         break;
255                 }
256         }
257 
258         return NOTIFY_DONE;
259 }
260 
261 /*
262  *      Add a socket to the bound sockets list.
263  */
264 static void x25_insert_socket(struct sock *sk)
265 {
266         write_lock_bh(&x25_list_lock);
267         sk_add_node(sk, &x25_list);
268         write_unlock_bh(&x25_list_lock);
269 }
270 
271 /*
272  *      Find a socket that wants to accept the Call Request we just
273  *      received. Check the full list for an address/cud match.
274  *      If no cuds match return the next_best thing, an address match.
275  *      Note: if a listening socket has cud set it must only get calls
276  *      with matching cud.
277  */
278 static struct sock *x25_find_listener(struct x25_address *addr,
279                                         struct sk_buff *skb)
280 {
281         struct sock *s;
282         struct sock *next_best;
283         struct hlist_node *node;
284 
285         read_lock_bh(&x25_list_lock);
286         next_best = NULL;
287 
288         sk_for_each(s, node, &x25_list)
289                 if ((!strcmp(addr->x25_addr,
290                         x25_sk(s)->source_addr.x25_addr) ||
291                                 !strcmp(addr->x25_addr,
292                                         null_x25_address.x25_addr)) &&
293                                         s->sk_state == TCP_LISTEN) {
294                         /*
295                          * Found a listening socket, now check the incoming
296                          * call user data vs this sockets call user data
297                          */
298                         if (x25_sk(s)->cudmatchlength > 0 &&
299                                 skb->len >= x25_sk(s)->cudmatchlength) {
300                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301                                         skb->data,
302                                         x25_sk(s)->cudmatchlength)) == 0) {
303                                         sock_hold(s);
304                                         goto found;
305                                  }
306                         } else
307                                 next_best = s;
308                 }
309         if (next_best) {
310                 s = next_best;
311                 sock_hold(s);
312                 goto found;
313         }
314         s = NULL;
315 found:
316         read_unlock_bh(&x25_list_lock);
317         return s;
318 }
319 
320 /*
321  *      Find a connected X.25 socket given my LCI and neighbour.
322  */
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325         struct sock *s;
326         struct hlist_node *node;
327 
328         sk_for_each(s, node, &x25_list)
329                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330                         sock_hold(s);
331                         goto found;
332                 }
333         s = NULL;
334 found:
335         return s;
336 }
337 
338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339 {
340         struct sock *s;
341 
342         read_lock_bh(&x25_list_lock);
343         s = __x25_find_socket(lci, nb);
344         read_unlock_bh(&x25_list_lock);
345         return s;
346 }
347 
348 /*
349  *      Find a unique LCI for a given device.
350  */
351 static unsigned int x25_new_lci(struct x25_neigh *nb)
352 {
353         unsigned int lci = 1;
354         struct sock *sk;
355 
356         read_lock_bh(&x25_list_lock);
357 
358         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359                 sock_put(sk);
360                 if (++lci == 4096) {
361                         lci = 0;
362                         break;
363                 }
364         }
365 
366         read_unlock_bh(&x25_list_lock);
367         return lci;
368 }
369 
370 /*
371  *      Deferred destroy.
372  */
373 static void __x25_destroy_socket(struct sock *);
374 
375 /*
376  *      handler for deferred kills.
377  */
378 static void x25_destroy_timer(unsigned long data)
379 {
380         x25_destroy_socket_from_timer((struct sock *)data);
381 }
382 
383 /*
384  *      This is called from user mode and the timers. Thus it protects itself
385  *      against interrupt users but doesn't worry about being called during
386  *      work. Once it is removed from the queue no interrupt or bottom half
387  *      will touch it and we are (fairly 8-) ) safe.
388  *      Not static as it's used by the timer
389  */
390 static void __x25_destroy_socket(struct sock *sk)
391 {
392         struct sk_buff *skb;
393 
394         x25_stop_heartbeat(sk);
395         x25_stop_timer(sk);
396 
397         x25_remove_socket(sk);
398         x25_clear_queues(sk);           /* Flush the queues */
399 
400         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401                 if (skb->sk != sk) {            /* A pending connection */
402                         /*
403                          * Queue the unaccepted socket for death
404                          */
405                         skb->sk->sk_state = TCP_LISTEN;
406                         sock_set_flag(skb->sk, SOCK_DEAD);
407                         x25_start_heartbeat(skb->sk);
408                         x25_sk(skb->sk)->state = X25_STATE_0;
409                 }
410 
411                 kfree_skb(skb);
412         }
413 
414         if (sk_has_allocations(sk)) {
415                 /* Defer: outstanding buffers */
416                 sk->sk_timer.expires  = jiffies + 10 * HZ;
417                 sk->sk_timer.function = x25_destroy_timer;
418                 sk->sk_timer.data = (unsigned long)sk;
419                 add_timer(&sk->sk_timer);
420         } else {
421                 /* drop last reference so sock_put will free */
422                 __sock_put(sk);
423         }
424 }
425 
426 void x25_destroy_socket_from_timer(struct sock *sk)
427 {
428         sock_hold(sk);
429         bh_lock_sock(sk);
430         __x25_destroy_socket(sk);
431         bh_unlock_sock(sk);
432         sock_put(sk);
433 }
434 
435 /*
436  *      Handling for system calls applied via the various interfaces to a
437  *      X.25 socket object.
438  */
439 
440 static int x25_setsockopt(struct socket *sock, int level, int optname,
441                           char __user *optval, unsigned int optlen)
442 {
443         int opt;
444         struct sock *sk = sock->sk;
445         int rc = -ENOPROTOOPT;
446 
447         if (level != SOL_X25 || optname != X25_QBITINCL)
448                 goto out;
449 
450         rc = -EINVAL;
451         if (optlen < sizeof(int))
452                 goto out;
453 
454         rc = -EFAULT;
455         if (get_user(opt, (int __user *)optval))
456                 goto out;
457 
458         if (opt)
459                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460         else
461                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
462         rc = 0;
463 out:
464         return rc;
465 }
466 
467 static int x25_getsockopt(struct socket *sock, int level, int optname,
468                           char __user *optval, int __user *optlen)
469 {
470         struct sock *sk = sock->sk;
471         int val, len, rc = -ENOPROTOOPT;
472 
473         if (level != SOL_X25 || optname != X25_QBITINCL)
474                 goto out;
475 
476         rc = -EFAULT;
477         if (get_user(len, optlen))
478                 goto out;
479 
480         len = min_t(unsigned int, len, sizeof(int));
481 
482         rc = -EINVAL;
483         if (len < 0)
484                 goto out;
485 
486         rc = -EFAULT;
487         if (put_user(len, optlen))
488                 goto out;
489 
490         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
491         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
492 out:
493         return rc;
494 }
495 
496 static int x25_listen(struct socket *sock, int backlog)
497 {
498         struct sock *sk = sock->sk;
499         int rc = -EOPNOTSUPP;
500 
501         lock_sock(sk);
502         if (sk->sk_state != TCP_LISTEN) {
503                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
504                 sk->sk_max_ack_backlog = backlog;
505                 sk->sk_state           = TCP_LISTEN;
506                 rc = 0;
507         }
508         release_sock(sk);
509 
510         return rc;
511 }
512 
513 static struct proto x25_proto = {
514         .name     = "X25",
515         .owner    = THIS_MODULE,
516         .obj_size = sizeof(struct x25_sock),
517 };
518 
519 static struct sock *x25_alloc_socket(struct net *net)
520 {
521         struct x25_sock *x25;
522         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
523 
524         if (!sk)
525                 goto out;
526 
527         sock_init_data(NULL, sk);
528 
529         x25 = x25_sk(sk);
530         skb_queue_head_init(&x25->ack_queue);
531         skb_queue_head_init(&x25->fragment_queue);
532         skb_queue_head_init(&x25->interrupt_in_queue);
533         skb_queue_head_init(&x25->interrupt_out_queue);
534 out:
535         return sk;
536 }
537 
538 static int x25_create(struct net *net, struct socket *sock, int protocol,
539                       int kern)
540 {
541         struct sock *sk;
542         struct x25_sock *x25;
543         int rc = -EAFNOSUPPORT;
544 
545         if (!net_eq(net, &init_net))
546                 goto out;
547 
548         rc = -ESOCKTNOSUPPORT;
549         if (sock->type != SOCK_SEQPACKET)
550                 goto out;
551 
552         rc = -EINVAL;
553         if (protocol)
554                 goto out;
555 
556         rc = -ENOBUFS;
557         if ((sk = x25_alloc_socket(net)) == NULL)
558                 goto out;
559 
560         x25 = x25_sk(sk);
561 
562         sock_init_data(sock, sk);
563 
564         x25_init_timers(sk);
565 
566         sock->ops    = &x25_proto_ops;
567         sk->sk_protocol = protocol;
568         sk->sk_backlog_rcv = x25_backlog_rcv;
569 
570         x25->t21   = sysctl_x25_call_request_timeout;
571         x25->t22   = sysctl_x25_reset_request_timeout;
572         x25->t23   = sysctl_x25_clear_request_timeout;
573         x25->t2    = sysctl_x25_ack_holdback_timeout;
574         x25->state = X25_STATE_0;
575         x25->cudmatchlength = 0;
576         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
577                                                         /* on call accept   */
578 
579         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
580         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
581         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
582         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
583         x25->facilities.throughput  = 0;        /* by default don't negotiate
584                                                    throughput */
585         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
586         x25->dte_facilities.calling_len = 0;
587         x25->dte_facilities.called_len = 0;
588         memset(x25->dte_facilities.called_ae, '\0',
589                         sizeof(x25->dte_facilities.called_ae));
590         memset(x25->dte_facilities.calling_ae, '\0',
591                         sizeof(x25->dte_facilities.calling_ae));
592 
593         rc = 0;
594 out:
595         return rc;
596 }
597 
598 static struct sock *x25_make_new(struct sock *osk)
599 {
600         struct sock *sk = NULL;
601         struct x25_sock *x25, *ox25;
602 
603         if (osk->sk_type != SOCK_SEQPACKET)
604                 goto out;
605 
606         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
607                 goto out;
608 
609         x25 = x25_sk(sk);
610 
611         sk->sk_type        = osk->sk_type;
612         sk->sk_priority    = osk->sk_priority;
613         sk->sk_protocol    = osk->sk_protocol;
614         sk->sk_rcvbuf      = osk->sk_rcvbuf;
615         sk->sk_sndbuf      = osk->sk_sndbuf;
616         sk->sk_state       = TCP_ESTABLISHED;
617         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
618         sock_copy_flags(sk, osk);
619 
620         ox25 = x25_sk(osk);
621         x25->t21        = ox25->t21;
622         x25->t22        = ox25->t22;
623         x25->t23        = ox25->t23;
624         x25->t2         = ox25->t2;
625         x25->flags      = ox25->flags;
626         x25->facilities = ox25->facilities;
627         x25->dte_facilities = ox25->dte_facilities;
628         x25->cudmatchlength = ox25->cudmatchlength;
629 
630         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
631         x25_init_timers(sk);
632 out:
633         return sk;
634 }
635 
636 static int x25_release(struct socket *sock)
637 {
638         struct sock *sk = sock->sk;
639         struct x25_sock *x25;
640 
641         if (!sk)
642                 return 0;
643 
644         x25 = x25_sk(sk);
645 
646         sock_hold(sk);
647         lock_sock(sk);
648         switch (x25->state) {
649 
650                 case X25_STATE_0:
651                 case X25_STATE_2:
652                         x25_disconnect(sk, 0, 0, 0);
653                         __x25_destroy_socket(sk);
654                         goto out;
655 
656                 case X25_STATE_1:
657                 case X25_STATE_3:
658                 case X25_STATE_4:
659                         x25_clear_queues(sk);
660                         x25_write_internal(sk, X25_CLEAR_REQUEST);
661                         x25_start_t23timer(sk);
662                         x25->state = X25_STATE_2;
663                         sk->sk_state    = TCP_CLOSE;
664                         sk->sk_shutdown |= SEND_SHUTDOWN;
665                         sk->sk_state_change(sk);
666                         sock_set_flag(sk, SOCK_DEAD);
667                         sock_set_flag(sk, SOCK_DESTROY);
668                         break;
669         }
670 
671         sock_orphan(sk);
672 out:
673         release_sock(sk);
674         sock_put(sk);
675         return 0;
676 }
677 
678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
679 {
680         struct sock *sk = sock->sk;
681         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
682         int len, i, rc = 0;
683 
684         if (!sock_flag(sk, SOCK_ZAPPED) ||
685             addr_len != sizeof(struct sockaddr_x25) ||
686             addr->sx25_family != AF_X25) {
687                 rc = -EINVAL;
688                 goto out;
689         }
690 
691         len = strlen(addr->sx25_addr.x25_addr);
692         for (i = 0; i < len; i++) {
693                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
694                         rc = -EINVAL;
695                         goto out;
696                 }
697         }
698 
699         lock_sock(sk);
700         x25_sk(sk)->source_addr = addr->sx25_addr;
701         x25_insert_socket(sk);
702         sock_reset_flag(sk, SOCK_ZAPPED);
703         release_sock(sk);
704         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
705 out:
706         return rc;
707 }
708 
709 static int x25_wait_for_connection_establishment(struct sock *sk)
710 {
711         DECLARE_WAITQUEUE(wait, current);
712         int rc;
713 
714         add_wait_queue_exclusive(sk_sleep(sk), &wait);
715         for (;;) {
716                 __set_current_state(TASK_INTERRUPTIBLE);
717                 rc = -ERESTARTSYS;
718                 if (signal_pending(current))
719                         break;
720                 rc = sock_error(sk);
721                 if (rc) {
722                         sk->sk_socket->state = SS_UNCONNECTED;
723                         break;
724                 }
725                 rc = 0;
726                 if (sk->sk_state != TCP_ESTABLISHED) {
727                         release_sock(sk);
728                         schedule();
729                         lock_sock(sk);
730                 } else
731                         break;
732         }
733         __set_current_state(TASK_RUNNING);
734         remove_wait_queue(sk_sleep(sk), &wait);
735         return rc;
736 }
737 
738 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739                        int addr_len, int flags)
740 {
741         struct sock *sk = sock->sk;
742         struct x25_sock *x25 = x25_sk(sk);
743         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744         struct x25_route *rt;
745         int rc = 0;
746 
747         lock_sock(sk);
748         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749                 sock->state = SS_CONNECTED;
750                 goto out; /* Connect completed during a ERESTARTSYS event */
751         }
752 
753         rc = -ECONNREFUSED;
754         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755                 sock->state = SS_UNCONNECTED;
756                 goto out;
757         }
758 
759         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
760         if (sk->sk_state == TCP_ESTABLISHED)
761                 goto out;
762 
763         sk->sk_state   = TCP_CLOSE;
764         sock->state = SS_UNCONNECTED;
765 
766         rc = -EINVAL;
767         if (addr_len != sizeof(struct sockaddr_x25) ||
768             addr->sx25_family != AF_X25)
769                 goto out;
770 
771         rc = -ENETUNREACH;
772         rt = x25_get_route(&addr->sx25_addr);
773         if (!rt)
774                 goto out;
775 
776         x25->neighbour = x25_get_neigh(rt->dev);
777         if (!x25->neighbour)
778                 goto out_put_route;
779 
780         x25_limit_facilities(&x25->facilities, x25->neighbour);
781 
782         x25->lci = x25_new_lci(x25->neighbour);
783         if (!x25->lci)
784                 goto out_put_neigh;
785 
786         rc = -EINVAL;
787         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
788                 goto out_put_neigh;
789 
790         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
791                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
792 
793         x25->dest_addr = addr->sx25_addr;
794 
795         /* Move to connecting socket, start sending Connect Requests */
796         sock->state   = SS_CONNECTING;
797         sk->sk_state  = TCP_SYN_SENT;
798 
799         x25->state = X25_STATE_1;
800 
801         x25_write_internal(sk, X25_CALL_REQUEST);
802 
803         x25_start_heartbeat(sk);
804         x25_start_t21timer(sk);
805 
806         /* Now the loop */
807         rc = -EINPROGRESS;
808         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
809                 goto out_put_neigh;
810 
811         rc = x25_wait_for_connection_establishment(sk);
812         if (rc)
813                 goto out_put_neigh;
814 
815         sock->state = SS_CONNECTED;
816         rc = 0;
817 out_put_neigh:
818         if (rc)
819                 x25_neigh_put(x25->neighbour);
820 out_put_route:
821         x25_route_put(rt);
822 out:
823         release_sock(sk);
824         return rc;
825 }
826 
827 static int x25_wait_for_data(struct sock *sk, long timeout)
828 {
829         DECLARE_WAITQUEUE(wait, current);
830         int rc = 0;
831 
832         add_wait_queue_exclusive(sk_sleep(sk), &wait);
833         for (;;) {
834                 __set_current_state(TASK_INTERRUPTIBLE);
835                 if (sk->sk_shutdown & RCV_SHUTDOWN)
836                         break;
837                 rc = -ERESTARTSYS;
838                 if (signal_pending(current))
839                         break;
840                 rc = -EAGAIN;
841                 if (!timeout)
842                         break;
843                 rc = 0;
844                 if (skb_queue_empty(&sk->sk_receive_queue)) {
845                         release_sock(sk);
846                         timeout = schedule_timeout(timeout);
847                         lock_sock(sk);
848                 } else
849                         break;
850         }
851         __set_current_state(TASK_RUNNING);
852         remove_wait_queue(sk_sleep(sk), &wait);
853         return rc;
854 }
855 
856 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
857 {
858         struct sock *sk = sock->sk;
859         struct sock *newsk;
860         struct sk_buff *skb;
861         int rc = -EINVAL;
862 
863         if (!sk)
864                 goto out;
865 
866         rc = -EOPNOTSUPP;
867         if (sk->sk_type != SOCK_SEQPACKET)
868                 goto out;
869 
870         lock_sock(sk);
871         rc = -EINVAL;
872         if (sk->sk_state != TCP_LISTEN)
873                 goto out2;
874 
875         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
876         if (rc)
877                 goto out2;
878         skb = skb_dequeue(&sk->sk_receive_queue);
879         rc = -EINVAL;
880         if (!skb->sk)
881                 goto out2;
882         newsk            = skb->sk;
883         sock_graft(newsk, newsock);
884 
885         /* Now attach up the new socket */
886         skb->sk = NULL;
887         kfree_skb(skb);
888         sk->sk_ack_backlog--;
889         newsock->state = SS_CONNECTED;
890         rc = 0;
891 out2:
892         release_sock(sk);
893 out:
894         return rc;
895 }
896 
897 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
898                        int *uaddr_len, int peer)
899 {
900         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
901         struct sock *sk = sock->sk;
902         struct x25_sock *x25 = x25_sk(sk);
903         int rc = 0;
904 
905         if (peer) {
906                 if (sk->sk_state != TCP_ESTABLISHED) {
907                         rc = -ENOTCONN;
908                         goto out;
909                 }
910                 sx25->sx25_addr = x25->dest_addr;
911         } else
912                 sx25->sx25_addr = x25->source_addr;
913 
914         sx25->sx25_family = AF_X25;
915         *uaddr_len = sizeof(*sx25);
916 
917 out:
918         return rc;
919 }
920 
921 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
922                         unsigned int lci)
923 {
924         struct sock *sk;
925         struct sock *make;
926         struct x25_sock *makex25;
927         struct x25_address source_addr, dest_addr;
928         struct x25_facilities facilities;
929         struct x25_dte_facilities dte_facilities;
930         int len, addr_len, rc;
931 
932         /*
933          *      Remove the LCI and frame type.
934          */
935         skb_pull(skb, X25_STD_MIN_LEN);
936 
937         /*
938          *      Extract the X.25 addresses and convert them to ASCII strings,
939          *      and remove them.
940          *
941          *      Address block is mandatory in call request packets
942          */
943         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
944         if (addr_len <= 0)
945                 goto out_clear_request;
946         skb_pull(skb, addr_len);
947 
948         /*
949          *      Get the length of the facilities, skip past them for the moment
950          *      get the call user data because this is needed to determine
951          *      the correct listener
952          *
953          *      Facilities length is mandatory in call request packets
954          */
955         if (!pskb_may_pull(skb, 1))
956                 goto out_clear_request;
957         len = skb->data[0] + 1;
958         if (!pskb_may_pull(skb, len))
959                 goto out_clear_request;
960         skb_pull(skb,len);
961 
962         /*
963          *      Ensure that the amount of call user data is valid.
964          */
965         if (skb->len > X25_MAX_CUD_LEN)
966                 goto out_clear_request;
967 
968         /*
969          *      Get all the call user data so it can be used in
970          *      x25_find_listener and skb_copy_from_linear_data up ahead.
971          */
972         if (!pskb_may_pull(skb, skb->len))
973                 goto out_clear_request;
974 
975         /*
976          *      Find a listener for the particular address/cud pair.
977          */
978         sk = x25_find_listener(&source_addr,skb);
979         skb_push(skb,len);
980 
981         if (sk != NULL && sk_acceptq_is_full(sk)) {
982                 goto out_sock_put;
983         }
984 
985         /*
986          *      We dont have any listeners for this incoming call.
987          *      Try forwarding it.
988          */
989         if (sk == NULL) {
990                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
991                 if (sysctl_x25_forward &&
992                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
993                 {
994                         /* Call was forwarded, dont process it any more */
995                         kfree_skb(skb);
996                         rc = 1;
997                         goto out;
998                 } else {
999                         /* No listeners, can't forward, clear the call */
1000                         goto out_clear_request;
1001                 }
1002         }
1003 
1004         /*
1005          *      Try to reach a compromise on the requested facilities.
1006          */
1007         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1008         if (len == -1)
1009                 goto out_sock_put;
1010 
1011         /*
1012          * current neighbour/link might impose additional limits
1013          * on certain facilties
1014          */
1015 
1016         x25_limit_facilities(&facilities, nb);
1017 
1018         /*
1019          *      Try to create a new socket.
1020          */
1021         make = x25_make_new(sk);
1022         if (!make)
1023                 goto out_sock_put;
1024 
1025         /*
1026          *      Remove the facilities
1027          */
1028         skb_pull(skb, len);
1029 
1030         skb->sk     = make;
1031         make->sk_state = TCP_ESTABLISHED;
1032 
1033         makex25 = x25_sk(make);
1034         makex25->lci           = lci;
1035         makex25->dest_addr     = dest_addr;
1036         makex25->source_addr   = source_addr;
1037         makex25->neighbour     = nb;
1038         makex25->facilities    = facilities;
1039         makex25->dte_facilities= dte_facilities;
1040         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1041         /* ensure no reverse facil on accept */
1042         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1043         /* ensure no calling address extension on accept */
1044         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1045         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1046 
1047         /* Normally all calls are accepted immediately */
1048         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1049                 x25_write_internal(make, X25_CALL_ACCEPTED);
1050                 makex25->state = X25_STATE_3;
1051         }
1052 
1053         /*
1054          *      Incoming Call User Data.
1055          */
1056         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1057         makex25->calluserdata.cudlength = skb->len;
1058 
1059         sk->sk_ack_backlog++;
1060 
1061         x25_insert_socket(make);
1062 
1063         skb_queue_head(&sk->sk_receive_queue, skb);
1064 
1065         x25_start_heartbeat(make);
1066 
1067         if (!sock_flag(sk, SOCK_DEAD))
1068                 sk->sk_data_ready(sk, skb->len);
1069         rc = 1;
1070         sock_put(sk);
1071 out:
1072         return rc;
1073 out_sock_put:
1074         sock_put(sk);
1075 out_clear_request:
1076         rc = 0;
1077         x25_transmit_clear_request(nb, lci, 0x01);
1078         goto out;
1079 }
1080 
1081 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1082                        struct msghdr *msg, size_t len)
1083 {
1084         struct sock *sk = sock->sk;
1085         struct x25_sock *x25 = x25_sk(sk);
1086         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1087         struct sockaddr_x25 sx25;
1088         struct sk_buff *skb;
1089         unsigned char *asmptr;
1090         int noblock = msg->msg_flags & MSG_DONTWAIT;
1091         size_t size;
1092         int qbit = 0, rc = -EINVAL;
1093 
1094         lock_sock(sk);
1095         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1096                 goto out;
1097 
1098         /* we currently don't support segmented records at the user interface */
1099         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1100                 goto out;
1101 
1102         rc = -EADDRNOTAVAIL;
1103         if (sock_flag(sk, SOCK_ZAPPED))
1104                 goto out;
1105 
1106         rc = -EPIPE;
1107         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1108                 send_sig(SIGPIPE, current, 0);
1109                 goto out;
1110         }
1111 
1112         rc = -ENETUNREACH;
1113         if (!x25->neighbour)
1114                 goto out;
1115 
1116         if (usx25) {
1117                 rc = -EINVAL;
1118                 if (msg->msg_namelen < sizeof(sx25))
1119                         goto out;
1120                 memcpy(&sx25, usx25, sizeof(sx25));
1121                 rc = -EISCONN;
1122                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1123                         goto out;
1124                 rc = -EINVAL;
1125                 if (sx25.sx25_family != AF_X25)
1126                         goto out;
1127         } else {
1128                 /*
1129                  *      FIXME 1003.1g - if the socket is like this because
1130                  *      it has become closed (not started closed) we ought
1131                  *      to SIGPIPE, EPIPE;
1132                  */
1133                 rc = -ENOTCONN;
1134                 if (sk->sk_state != TCP_ESTABLISHED)
1135                         goto out;
1136 
1137                 sx25.sx25_family = AF_X25;
1138                 sx25.sx25_addr   = x25->dest_addr;
1139         }
1140 
1141         /* Sanity check the packet size */
1142         if (len > 65535) {
1143                 rc = -EMSGSIZE;
1144                 goto out;
1145         }
1146 
1147         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1148 
1149         /* Build a packet */
1150         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1151 
1152         if ((msg->msg_flags & MSG_OOB) && len > 32)
1153                 len = 32;
1154 
1155         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1156 
1157         release_sock(sk);
1158         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1159         lock_sock(sk);
1160         if (!skb)
1161                 goto out;
1162         X25_SKB_CB(skb)->flags = msg->msg_flags;
1163 
1164         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1165 
1166         /*
1167          *      Put the data on the end
1168          */
1169         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1170 
1171         skb_reset_transport_header(skb);
1172         skb_put(skb, len);
1173 
1174         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1175         if (rc)
1176                 goto out_kfree_skb;
1177 
1178         /*
1179          *      If the Q BIT Include socket option is in force, the first
1180          *      byte of the user data is the logical value of the Q Bit.
1181          */
1182         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1183                 if (!pskb_may_pull(skb, 1))
1184                         goto out_kfree_skb;
1185 
1186                 qbit = skb->data[0];
1187                 skb_pull(skb, 1);
1188         }
1189 
1190         /*
1191          *      Push down the X.25 header
1192          */
1193         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1194 
1195         if (msg->msg_flags & MSG_OOB) {
1196                 if (x25->neighbour->extended) {
1197                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1198                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1199                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1200                         *asmptr++ = X25_INTERRUPT;
1201                 } else {
1202                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1203                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1204                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1205                         *asmptr++ = X25_INTERRUPT;
1206                 }
1207         } else {
1208                 if (x25->neighbour->extended) {
1209                         /* Build an Extended X.25 header */
1210                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1211                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1212                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1213                         *asmptr++ = X25_DATA;
1214                         *asmptr++ = X25_DATA;
1215                 } else {
1216                         /* Build an Standard X.25 header */
1217                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1218                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1220                         *asmptr++ = X25_DATA;
1221                 }
1222 
1223                 if (qbit)
1224                         skb->data[0] |= X25_Q_BIT;
1225         }
1226 
1227         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1228         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1229 
1230         rc = -ENOTCONN;
1231         if (sk->sk_state != TCP_ESTABLISHED)
1232                 goto out_kfree_skb;
1233 
1234         if (msg->msg_flags & MSG_OOB)
1235                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1236         else {
1237                 rc = x25_output(sk, skb);
1238                 len = rc;
1239                 if (rc < 0)
1240                         kfree_skb(skb);
1241                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1242                         len++;
1243         }
1244 
1245         x25_kick(sk);
1246         rc = len;
1247 out:
1248         release_sock(sk);
1249         return rc;
1250 out_kfree_skb:
1251         kfree_skb(skb);
1252         goto out;
1253 }
1254 
1255 
1256 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1257                        struct msghdr *msg, size_t size,
1258                        int flags)
1259 {
1260         struct sock *sk = sock->sk;
1261         struct x25_sock *x25 = x25_sk(sk);
1262         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1263         size_t copied;
1264         int qbit, header_len;
1265         struct sk_buff *skb;
1266         unsigned char *asmptr;
1267         int rc = -ENOTCONN;
1268 
1269         lock_sock(sk);
1270 
1271         if (x25->neighbour == NULL)
1272                 goto out;
1273 
1274         header_len = x25->neighbour->extended ?
1275                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1276 
1277         /*
1278          * This works for seqpacket too. The receiver has ordered the queue for
1279          * us! We do one quick check first though
1280          */
1281         if (sk->sk_state != TCP_ESTABLISHED)
1282                 goto out;
1283 
1284         if (flags & MSG_OOB) {
1285                 rc = -EINVAL;
1286                 if (sock_flag(sk, SOCK_URGINLINE) ||
1287                     !skb_peek(&x25->interrupt_in_queue))
1288                         goto out;
1289 
1290                 skb = skb_dequeue(&x25->interrupt_in_queue);
1291 
1292                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1293                         goto out_free_dgram;
1294 
1295                 skb_pull(skb, X25_STD_MIN_LEN);
1296 
1297                 /*
1298                  *      No Q bit information on Interrupt data.
1299                  */
1300                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1301                         asmptr  = skb_push(skb, 1);
1302                         *asmptr = 0x00;
1303                 }
1304 
1305                 msg->msg_flags |= MSG_OOB;
1306         } else {
1307                 /* Now we can treat all alike */
1308                 release_sock(sk);
1309                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1310                                         flags & MSG_DONTWAIT, &rc);
1311                 lock_sock(sk);
1312                 if (!skb)
1313                         goto out;
1314 
1315                 if (!pskb_may_pull(skb, header_len))
1316                         goto out_free_dgram;
1317 
1318                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1319 
1320                 skb_pull(skb, header_len);
1321 
1322                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1323                         asmptr  = skb_push(skb, 1);
1324                         *asmptr = qbit;
1325                 }
1326         }
1327 
1328         skb_reset_transport_header(skb);
1329         copied = skb->len;
1330 
1331         if (copied > size) {
1332                 copied = size;
1333                 msg->msg_flags |= MSG_TRUNC;
1334         }
1335 
1336         /* Currently, each datagram always contains a complete record */
1337         msg->msg_flags |= MSG_EOR;
1338 
1339         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1340         if (rc)
1341                 goto out_free_dgram;
1342 
1343         if (sx25) {
1344                 sx25->sx25_family = AF_X25;
1345                 sx25->sx25_addr   = x25->dest_addr;
1346         }
1347 
1348         msg->msg_namelen = sizeof(struct sockaddr_x25);
1349 
1350         x25_check_rbuf(sk);
1351         rc = copied;
1352 out_free_dgram:
1353         skb_free_datagram(sk, skb);
1354 out:
1355         release_sock(sk);
1356         return rc;
1357 }
1358 
1359 
1360 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1361 {
1362         struct sock *sk = sock->sk;
1363         struct x25_sock *x25 = x25_sk(sk);
1364         void __user *argp = (void __user *)arg;
1365         int rc;
1366 
1367         switch (cmd) {
1368         case TIOCOUTQ: {
1369                 int amount;
1370 
1371                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1372                 if (amount < 0)
1373                         amount = 0;
1374                 rc = put_user(amount, (unsigned int __user *)argp);
1375                 break;
1376         }
1377 
1378         case TIOCINQ: {
1379                 struct sk_buff *skb;
1380                 int amount = 0;
1381                 /*
1382                  * These two are safe on a single CPU system as
1383                  * only user tasks fiddle here
1384                  */
1385                 lock_sock(sk);
1386                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1387                         amount = skb->len;
1388                 release_sock(sk);
1389                 rc = put_user(amount, (unsigned int __user *)argp);
1390                 break;
1391         }
1392 
1393         case SIOCGSTAMP:
1394                 rc = -EINVAL;
1395                 if (sk)
1396                         rc = sock_get_timestamp(sk,
1397                                                 (struct timeval __user *)argp);
1398                 break;
1399         case SIOCGSTAMPNS:
1400                 rc = -EINVAL;
1401                 if (sk)
1402                         rc = sock_get_timestampns(sk,
1403                                         (struct timespec __user *)argp);
1404                 break;
1405         case SIOCGIFADDR:
1406         case SIOCSIFADDR:
1407         case SIOCGIFDSTADDR:
1408         case SIOCSIFDSTADDR:
1409         case SIOCGIFBRDADDR:
1410         case SIOCSIFBRDADDR:
1411         case SIOCGIFNETMASK:
1412         case SIOCSIFNETMASK:
1413         case SIOCGIFMETRIC:
1414         case SIOCSIFMETRIC:
1415                 rc = -EINVAL;
1416                 break;
1417         case SIOCADDRT:
1418         case SIOCDELRT:
1419                 rc = -EPERM;
1420                 if (!capable(CAP_NET_ADMIN))
1421                         break;
1422                 rc = x25_route_ioctl(cmd, argp);
1423                 break;
1424         case SIOCX25GSUBSCRIP:
1425                 rc = x25_subscr_ioctl(cmd, argp);
1426                 break;
1427         case SIOCX25SSUBSCRIP:
1428                 rc = -EPERM;
1429                 if (!capable(CAP_NET_ADMIN))
1430                         break;
1431                 rc = x25_subscr_ioctl(cmd, argp);
1432                 break;
1433         case SIOCX25GFACILITIES: {
1434                 lock_sock(sk);
1435                 rc = copy_to_user(argp, &x25->facilities,
1436                                   sizeof(x25->facilities))
1437                         ? -EFAULT : 0;
1438                 release_sock(sk);
1439                 break;
1440         }
1441 
1442         case SIOCX25SFACILITIES: {
1443                 struct x25_facilities facilities;
1444                 rc = -EFAULT;
1445                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1446                         break;
1447                 rc = -EINVAL;
1448                 lock_sock(sk);
1449                 if (sk->sk_state != TCP_LISTEN &&
1450                     sk->sk_state != TCP_CLOSE)
1451                         goto out_fac_release;
1452                 if (facilities.pacsize_in < X25_PS16 ||
1453                     facilities.pacsize_in > X25_PS4096)
1454                         goto out_fac_release;
1455                 if (facilities.pacsize_out < X25_PS16 ||
1456                     facilities.pacsize_out > X25_PS4096)
1457                         goto out_fac_release;
1458                 if (facilities.winsize_in < 1 ||
1459                     facilities.winsize_in > 127)
1460                         goto out_fac_release;
1461                 if (facilities.throughput) {
1462                         int out = facilities.throughput & 0xf0;
1463                         int in  = facilities.throughput & 0x0f;
1464                         if (!out)
1465                                 facilities.throughput |=
1466                                         X25_DEFAULT_THROUGHPUT << 4;
1467                         else if (out < 0x30 || out > 0xD0)
1468                                 goto out_fac_release;
1469                         if (!in)
1470                                 facilities.throughput |=
1471                                         X25_DEFAULT_THROUGHPUT;
1472                         else if (in < 0x03 || in > 0x0D)
1473                                 goto out_fac_release;
1474                 }
1475                 if (facilities.reverse &&
1476                     (facilities.reverse & 0x81) != 0x81)
1477                         goto out_fac_release;
1478                 x25->facilities = facilities;
1479                 rc = 0;
1480 out_fac_release:
1481                 release_sock(sk);
1482                 break;
1483         }
1484 
1485         case SIOCX25GDTEFACILITIES: {
1486                 lock_sock(sk);
1487                 rc = copy_to_user(argp, &x25->dte_facilities,
1488                                   sizeof(x25->dte_facilities));
1489                 release_sock(sk);
1490                 if (rc)
1491                         rc = -EFAULT;
1492                 break;
1493         }
1494 
1495         case SIOCX25SDTEFACILITIES: {
1496                 struct x25_dte_facilities dtefacs;
1497                 rc = -EFAULT;
1498                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1499                         break;
1500                 rc = -EINVAL;
1501                 lock_sock(sk);
1502                 if (sk->sk_state != TCP_LISTEN &&
1503                     sk->sk_state != TCP_CLOSE)
1504                         goto out_dtefac_release;
1505                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1506                         goto out_dtefac_release;
1507                 if (dtefacs.calling_ae == NULL)
1508                         goto out_dtefac_release;
1509                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1510                         goto out_dtefac_release;
1511                 if (dtefacs.called_ae == NULL)
1512                         goto out_dtefac_release;
1513                 x25->dte_facilities = dtefacs;
1514                 rc = 0;
1515 out_dtefac_release:
1516                 release_sock(sk);
1517                 break;
1518         }
1519 
1520         case SIOCX25GCALLUSERDATA: {
1521                 lock_sock(sk);
1522                 rc = copy_to_user(argp, &x25->calluserdata,
1523                                   sizeof(x25->calluserdata))
1524                         ? -EFAULT : 0;
1525                 release_sock(sk);
1526                 break;
1527         }
1528 
1529         case SIOCX25SCALLUSERDATA: {
1530                 struct x25_calluserdata calluserdata;
1531 
1532                 rc = -EFAULT;
1533                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1534                         break;
1535                 rc = -EINVAL;
1536                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1537                         break;
1538                 lock_sock(sk);
1539                 x25->calluserdata = calluserdata;
1540                 release_sock(sk);
1541                 rc = 0;
1542                 break;
1543         }
1544 
1545         case SIOCX25GCAUSEDIAG: {
1546                 lock_sock(sk);
1547                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1548                         ? -EFAULT : 0;
1549                 release_sock(sk);
1550                 break;
1551         }
1552 
1553         case SIOCX25SCAUSEDIAG: {
1554                 struct x25_causediag causediag;
1555                 rc = -EFAULT;
1556                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1557                         break;
1558                 lock_sock(sk);
1559                 x25->causediag = causediag;
1560                 release_sock(sk);
1561                 rc = 0;
1562                 break;
1563 
1564         }
1565 
1566         case SIOCX25SCUDMATCHLEN: {
1567                 struct x25_subaddr sub_addr;
1568                 rc = -EINVAL;
1569                 lock_sock(sk);
1570                 if(sk->sk_state != TCP_CLOSE)
1571                         goto out_cud_release;
1572                 rc = -EFAULT;
1573                 if (copy_from_user(&sub_addr, argp,
1574                                    sizeof(sub_addr)))
1575                         goto out_cud_release;
1576                 rc = -EINVAL;
1577                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1578                         goto out_cud_release;
1579                 x25->cudmatchlength = sub_addr.cudmatchlength;
1580                 rc = 0;
1581 out_cud_release:
1582                 release_sock(sk);
1583                 break;
1584         }
1585 
1586         case SIOCX25CALLACCPTAPPRV: {
1587                 rc = -EINVAL;
1588                 lock_sock(sk);
1589                 if (sk->sk_state != TCP_CLOSE)
1590                         break;
1591                 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1592                 release_sock(sk);
1593                 rc = 0;
1594                 break;
1595         }
1596 
1597         case SIOCX25SENDCALLACCPT:  {
1598                 rc = -EINVAL;
1599                 lock_sock(sk);
1600                 if (sk->sk_state != TCP_ESTABLISHED)
1601                         break;
1602                 /* must call accptapprv above */
1603                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1604                         break;
1605                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1606                 x25->state = X25_STATE_3;
1607                 release_sock(sk);
1608                 rc = 0;
1609                 break;
1610         }
1611 
1612         default:
1613                 rc = -ENOIOCTLCMD;
1614                 break;
1615         }
1616 
1617         return rc;
1618 }
1619 
1620 static const struct net_proto_family x25_family_ops = {
1621         .family =       AF_X25,
1622         .create =       x25_create,
1623         .owner  =       THIS_MODULE,
1624 };
1625 
1626 #ifdef CONFIG_COMPAT
1627 static int compat_x25_subscr_ioctl(unsigned int cmd,
1628                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1629 {
1630         struct compat_x25_subscrip_struct x25_subscr;
1631         struct x25_neigh *nb;
1632         struct net_device *dev;
1633         int rc = -EINVAL;
1634 
1635         rc = -EFAULT;
1636         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637                 goto out;
1638 
1639         rc = -EINVAL;
1640         dev = x25_dev_get(x25_subscr.device);
1641         if (dev == NULL)
1642                 goto out;
1643 
1644         nb = x25_get_neigh(dev);
1645         if (nb == NULL)
1646                 goto out_dev_put;
1647 
1648         dev_put(dev);
1649 
1650         if (cmd == SIOCX25GSUBSCRIP) {
1651                 read_lock_bh(&x25_neigh_list_lock);
1652                 x25_subscr.extended = nb->extended;
1653                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1654                 read_unlock_bh(&x25_neigh_list_lock);
1655                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1656                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657         } else {
1658                 rc = -EINVAL;
1659                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660                         rc = 0;
1661                         write_lock_bh(&x25_neigh_list_lock);
1662                         nb->extended = x25_subscr.extended;
1663                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1664                         write_unlock_bh(&x25_neigh_list_lock);
1665                 }
1666         }
1667         x25_neigh_put(nb);
1668 out:
1669         return rc;
1670 out_dev_put:
1671         dev_put(dev);
1672         goto out;
1673 }
1674 
1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676                                 unsigned long arg)
1677 {
1678         void __user *argp = compat_ptr(arg);
1679         struct sock *sk = sock->sk;
1680 
1681         int rc = -ENOIOCTLCMD;
1682 
1683         switch(cmd) {
1684         case TIOCOUTQ:
1685         case TIOCINQ:
1686                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1687                 break;
1688         case SIOCGSTAMP:
1689                 rc = -EINVAL;
1690                 if (sk)
1691                         rc = compat_sock_get_timestamp(sk,
1692                                         (struct timeval __user*)argp);
1693                 break;
1694         case SIOCGSTAMPNS:
1695                 rc = -EINVAL;
1696                 if (sk)
1697                         rc = compat_sock_get_timestampns(sk,
1698                                         (struct timespec __user*)argp);
1699                 break;
1700         case SIOCGIFADDR:
1701         case SIOCSIFADDR:
1702         case SIOCGIFDSTADDR:
1703         case SIOCSIFDSTADDR:
1704         case SIOCGIFBRDADDR:
1705         case SIOCSIFBRDADDR:
1706         case SIOCGIFNETMASK:
1707         case SIOCSIFNETMASK:
1708         case SIOCGIFMETRIC:
1709         case SIOCSIFMETRIC:
1710                 rc = -EINVAL;
1711                 break;
1712         case SIOCADDRT:
1713         case SIOCDELRT:
1714                 rc = -EPERM;
1715                 if (!capable(CAP_NET_ADMIN))
1716                         break;
1717                 rc = x25_route_ioctl(cmd, argp);
1718                 break;
1719         case SIOCX25GSUBSCRIP:
1720                 rc = compat_x25_subscr_ioctl(cmd, argp);
1721                 break;
1722         case SIOCX25SSUBSCRIP:
1723                 rc = -EPERM;
1724                 if (!capable(CAP_NET_ADMIN))
1725                         break;
1726                 rc = compat_x25_subscr_ioctl(cmd, argp);
1727                 break;
1728         case SIOCX25GFACILITIES:
1729         case SIOCX25SFACILITIES:
1730         case SIOCX25GDTEFACILITIES:
1731         case SIOCX25SDTEFACILITIES:
1732         case SIOCX25GCALLUSERDATA:
1733         case SIOCX25SCALLUSERDATA:
1734         case SIOCX25GCAUSEDIAG:
1735         case SIOCX25SCAUSEDIAG:
1736         case SIOCX25SCUDMATCHLEN:
1737         case SIOCX25CALLACCPTAPPRV:
1738         case SIOCX25SENDCALLACCPT:
1739                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1740                 break;
1741         default:
1742                 rc = -ENOIOCTLCMD;
1743                 break;
1744         }
1745         return rc;
1746 }
1747 #endif
1748 
1749 static const struct proto_ops x25_proto_ops = {
1750         .family =       AF_X25,
1751         .owner =        THIS_MODULE,
1752         .release =      x25_release,
1753         .bind =         x25_bind,
1754         .connect =      x25_connect,
1755         .socketpair =   sock_no_socketpair,
1756         .accept =       x25_accept,
1757         .getname =      x25_getname,
1758         .poll =         datagram_poll,
1759         .ioctl =        x25_ioctl,
1760 #ifdef CONFIG_COMPAT
1761         .compat_ioctl = compat_x25_ioctl,
1762 #endif
1763         .listen =       x25_listen,
1764         .shutdown =     sock_no_shutdown,
1765         .setsockopt =   x25_setsockopt,
1766         .getsockopt =   x25_getsockopt,
1767         .sendmsg =      x25_sendmsg,
1768         .recvmsg =      x25_recvmsg,
1769         .mmap =         sock_no_mmap,
1770         .sendpage =     sock_no_sendpage,
1771 };
1772 
1773 static struct packet_type x25_packet_type __read_mostly = {
1774         .type = cpu_to_be16(ETH_P_X25),
1775         .func = x25_lapb_receive_frame,
1776 };
1777 
1778 static struct notifier_block x25_dev_notifier = {
1779         .notifier_call = x25_device_event,
1780 };
1781 
1782 void x25_kill_by_neigh(struct x25_neigh *nb)
1783 {
1784         struct sock *s;
1785         struct hlist_node *node;
1786 
1787         write_lock_bh(&x25_list_lock);
1788 
1789         sk_for_each(s, node, &x25_list)
1790                 if (x25_sk(s)->neighbour == nb)
1791                         x25_disconnect(s, ENETUNREACH, 0, 0);
1792 
1793         write_unlock_bh(&x25_list_lock);
1794 
1795         /* Remove any related forwards */
1796         x25_clear_forward_by_dev(nb->dev);
1797 }
1798 
1799 static int __init x25_init(void)
1800 {
1801         int rc = proto_register(&x25_proto, 0);
1802 
1803         if (rc != 0)
1804                 goto out;
1805 
1806         rc = sock_register(&x25_family_ops);
1807         if (rc != 0)
1808                 goto out_proto;
1809 
1810         dev_add_pack(&x25_packet_type);
1811 
1812         rc = register_netdevice_notifier(&x25_dev_notifier);
1813         if (rc != 0)
1814                 goto out_sock;
1815 
1816         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1817 
1818         x25_register_sysctl();
1819         rc = x25_proc_init();
1820         if (rc != 0)
1821                 goto out_dev;
1822 out:
1823         return rc;
1824 out_dev:
1825         unregister_netdevice_notifier(&x25_dev_notifier);
1826 out_sock:
1827         sock_unregister(AF_X25);
1828 out_proto:
1829         proto_unregister(&x25_proto);
1830         goto out;
1831 }
1832 module_init(x25_init);
1833 
1834 static void __exit x25_exit(void)
1835 {
1836         x25_proc_exit();
1837         x25_link_free();
1838         x25_route_free();
1839 
1840         x25_unregister_sysctl();
1841 
1842         unregister_netdevice_notifier(&x25_dev_notifier);
1843 
1844         dev_remove_pack(&x25_packet_type);
1845 
1846         sock_unregister(AF_X25);
1847         proto_unregister(&x25_proto);
1848 }
1849 module_exit(x25_exit);
1850 
1851 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1852 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853 MODULE_LICENSE("GPL");
1854 MODULE_ALIAS_NETPROTO(PF_X25);
1855 

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