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net/x25: fix use-after-free in x25_device_event()
[linux-stable.git] / net / x25 / af_x25.c
blob716d53b683e0871656f0b3183a32bbf55e1614db
1 /*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
7 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 * X.25 002 Jonathan Naylor Centralised disconnect handling.
19 * New timer architecture.
20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
26 * Fixed x25_output() related skb leakage.
27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31 * x25_proc.c, using seq_file
32 * 2005-04-02 Shaun Pereira Selective sub address matching
33 * with call user data
34 * 2005-04-15 Shaun Pereira Fast select with no restriction on
35 * response
36 */
37
38 #define pr_fmt(fmt) "X25: " fmt
39
40 #include <linux/module.h>
41 #include <linux/capability.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/sched/signal.h>
45 #include <linux/timer.h>
46 #include <linux/string.h>
47 #include <linux/net.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/skbuff.h>
51 #include <linux/slab.h>
52 #include <net/sock.h>
53 #include <net/tcp_states.h>
54 #include <linux/uaccess.h>
55 #include <linux/fcntl.h>
56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
57 #include <linux/notifier.h>
58 #include <linux/init.h>
59 #include <linux/compat.h>
60 #include <linux/ctype.h>
61
62 #include <net/x25.h>
63 #include <net/compat.h>
64
65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
70 int sysctl_x25_forward = 0;
71
72 HLIST_HEAD(x25_list);
73 DEFINE_RWLOCK(x25_list_lock);
74
75 static const struct proto_ops x25_proto_ops;
76
77 static const struct x25_address null_x25_address = {" "};
78
79 #ifdef CONFIG_COMPAT
80 struct compat_x25_subscrip_struct {
81 char device[200-sizeof(compat_ulong_t)];
82 compat_ulong_t global_facil_mask;
83 compat_uint_t extended;
84 };
85 #endif
86
87
88 int x25_parse_address_block(struct sk_buff *skb,
89 struct x25_address *called_addr,
90 struct x25_address *calling_addr)
91 {
92 unsigned char len;
93 int needed;
94 int rc;
95
96 if (!pskb_may_pull(skb, 1)) {
97 /* packet has no address block */
98 rc = 0;
99 goto empty;
100 }
101
102 len = *skb->data;
103 needed = 1 + (len >> 4) + (len & 0x0f);
104
105 if (!pskb_may_pull(skb, needed)) {
106 /* packet is too short to hold the addresses it claims
107 to hold */
108 rc = -1;
109 goto empty;
110 }
111
112 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
113
114 empty:
115 *called_addr->x25_addr = 0;
116 *calling_addr->x25_addr = 0;
117
118 return rc;
119 }
120
121
122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
124 {
125 unsigned int called_len, calling_len;
126 char *called, *calling;
127 unsigned int i;
128
129 called_len = (*p >> 0) & 0x0F;
130 calling_len = (*p >> 4) & 0x0F;
131
132 called = called_addr->x25_addr;
133 calling = calling_addr->x25_addr;
134 p++;
135
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
138 if (i % 2 != 0) {
139 *called++ = ((*p >> 0) & 0x0F) + '0';
140 p++;
141 } else {
142 *called++ = ((*p >> 4) & 0x0F) + '0';
143 }
144 } else {
145 if (i % 2 != 0) {
146 *calling++ = ((*p >> 0) & 0x0F) + '0';
147 p++;
148 } else {
149 *calling++ = ((*p >> 4) & 0x0F) + '0';
150 }
151 }
152 }
153
154 *called = *calling = '\0';
155
156 return 1 + (called_len + calling_len + 1) / 2;
157 }
158
159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160 struct x25_address *calling_addr)
161 {
162 unsigned int called_len, calling_len;
163 char *called, *calling;
164 int i;
165
166 called = called_addr->x25_addr;
167 calling = calling_addr->x25_addr;
168
169 called_len = strlen(called);
170 calling_len = strlen(calling);
171
172 *p++ = (calling_len << 4) | (called_len << 0);
173
174 for (i = 0; i < (called_len + calling_len); i++) {
175 if (i < called_len) {
176 if (i % 2 != 0) {
177 *p |= (*called++ - '0') << 0;
178 p++;
179 } else {
180 *p = 0x00;
181 *p |= (*called++ - '0') << 4;
182 }
183 } else {
184 if (i % 2 != 0) {
185 *p |= (*calling++ - '0') << 0;
186 p++;
187 } else {
188 *p = 0x00;
189 *p |= (*calling++ - '0') << 4;
190 }
191 }
192 }
193
194 return 1 + (called_len + calling_len + 1) / 2;
195 }
196
197 /*
198 * Socket removal during an interrupt is now safe.
199 */
200 static void x25_remove_socket(struct sock *sk)
201 {
202 write_lock_bh(&x25_list_lock);
203 sk_del_node_init(sk);
204 write_unlock_bh(&x25_list_lock);
205 }
206
207 /*
208 * Kill all bound sockets on a dropped device.
209 */
210 static void x25_kill_by_device(struct net_device *dev)
211 {
212 struct sock *s;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, &x25_list)
217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
219
220 write_unlock_bh(&x25_list_lock);
221 }
222
223 /*
224 * Handle device status changes.
225 */
226 static int x25_device_event(struct notifier_block *this, unsigned long event,
227 void *ptr)
228 {
229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
230 struct x25_neigh *nb;
231
232 if (!net_eq(dev_net(dev), &init_net))
233 return NOTIFY_DONE;
234
235 if (dev->type == ARPHRD_X25
236 #if IS_ENABLED(CONFIG_LLC)
237 || dev->type == ARPHRD_ETHER
238 #endif
239 ) {
240 switch (event) {
241 case NETDEV_UP:
242 x25_link_device_up(dev);
243 break;
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
246 if (nb) {
247 x25_terminate_link(nb);
248 x25_neigh_put(nb);
249 }
250 break;
251 case NETDEV_DOWN:
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
255 break;
256 }
257 }
258
259 return NOTIFY_DONE;
260 }
261
262 /*
263 * Add a socket to the bound sockets list.
264 */
265 static void x25_insert_socket(struct sock *sk)
266 {
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
270 }
271
272 /*
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
277 * with matching cud.
278 */
279 static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
281 {
282 struct sock *s;
283 struct sock *next_best;
284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
288 sk_for_each(s, &x25_list)
289 if ((!strcmp(addr->x25_addr,
290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(addr->x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
307 next_best = s;
308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315 found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318 }
319
320 /*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326
327 sk_for_each(s, &x25_list)
328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329 sock_hold(s);
330 goto found;
331 }
332 s = NULL;
333 found:
334 return s;
335 }
336
337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338 {
339 struct sock *s;
340
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
344 return s;
345 }
346
347 /*
348 * Find a unique LCI for a given device.
349 */
350 static unsigned int x25_new_lci(struct x25_neigh *nb)
351 {
352 unsigned int lci = 1;
353 struct sock *sk;
354
355 while ((sk = x25_find_socket(lci, nb)) != NULL) {
356 sock_put(sk);
357 if (++lci == 4096) {
358 lci = 0;
359 break;
360 }
361 cond_resched();
362 }
363
364 return lci;
365 }
366
367 /*
368 * Deferred destroy.
369 */
370 static void __x25_destroy_socket(struct sock *);
371
372 /*
373 * handler for deferred kills.
374 */
375 static void x25_destroy_timer(unsigned long data)
376 {
377 x25_destroy_socket_from_timer((struct sock *)data);
378 }
379
380 /*
381 * This is called from user mode and the timers. Thus it protects itself
382 * against interrupt users but doesn't worry about being called during
383 * work. Once it is removed from the queue no interrupt or bottom half
384 * will touch it and we are (fairly 8-) ) safe.
385 * Not static as it's used by the timer
386 */
387 static void __x25_destroy_socket(struct sock *sk)
388 {
389 struct sk_buff *skb;
390
391 x25_stop_heartbeat(sk);
392 x25_stop_timer(sk);
393
394 x25_remove_socket(sk);
395 x25_clear_queues(sk); /* Flush the queues */
396
397 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
398 if (skb->sk != sk) { /* A pending connection */
399 /*
400 * Queue the unaccepted socket for death
401 */
402 skb->sk->sk_state = TCP_LISTEN;
403 sock_set_flag(skb->sk, SOCK_DEAD);
404 x25_start_heartbeat(skb->sk);
405 x25_sk(skb->sk)->state = X25_STATE_0;
406 }
407
408 kfree_skb(skb);
409 }
410
411 if (sk_has_allocations(sk)) {
412 /* Defer: outstanding buffers */
413 sk->sk_timer.expires = jiffies + 10 * HZ;
414 sk->sk_timer.function = x25_destroy_timer;
415 sk->sk_timer.data = (unsigned long)sk;
416 add_timer(&sk->sk_timer);
417 } else {
418 /* drop last reference so sock_put will free */
419 __sock_put(sk);
420 }
421 }
422
423 void x25_destroy_socket_from_timer(struct sock *sk)
424 {
425 sock_hold(sk);
426 bh_lock_sock(sk);
427 __x25_destroy_socket(sk);
428 bh_unlock_sock(sk);
429 sock_put(sk);
430 }
431
432 /*
433 * Handling for system calls applied via the various interfaces to a
434 * X.25 socket object.
435 */
436
437 static int x25_setsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, unsigned int optlen)
439 {
440 int opt;
441 struct sock *sk = sock->sk;
442 int rc = -ENOPROTOOPT;
443
444 if (level != SOL_X25 || optname != X25_QBITINCL)
445 goto out;
446
447 rc = -EINVAL;
448 if (optlen < sizeof(int))
449 goto out;
450
451 rc = -EFAULT;
452 if (get_user(opt, (int __user *)optval))
453 goto out;
454
455 if (opt)
456 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
457 else
458 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
459 rc = 0;
460 out:
461 return rc;
462 }
463
464 static int x25_getsockopt(struct socket *sock, int level, int optname,
465 char __user *optval, int __user *optlen)
466 {
467 struct sock *sk = sock->sk;
468 int val, len, rc = -ENOPROTOOPT;
469
470 if (level != SOL_X25 || optname != X25_QBITINCL)
471 goto out;
472
473 rc = -EFAULT;
474 if (get_user(len, optlen))
475 goto out;
476
477 len = min_t(unsigned int, len, sizeof(int));
478
479 rc = -EINVAL;
480 if (len < 0)
481 goto out;
482
483 rc = -EFAULT;
484 if (put_user(len, optlen))
485 goto out;
486
487 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
488 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
489 out:
490 return rc;
491 }
492
493 static int x25_listen(struct socket *sock, int backlog)
494 {
495 struct sock *sk = sock->sk;
496 int rc = -EOPNOTSUPP;
497
498 lock_sock(sk);
499 if (sk->sk_state != TCP_LISTEN) {
500 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
501 sk->sk_max_ack_backlog = backlog;
502 sk->sk_state = TCP_LISTEN;
503 rc = 0;
504 }
505 release_sock(sk);
506
507 return rc;
508 }
509
510 static struct proto x25_proto = {
511 .name = "X25",
512 .owner = THIS_MODULE,
513 .obj_size = sizeof(struct x25_sock),
514 };
515
516 static struct sock *x25_alloc_socket(struct net *net, int kern)
517 {
518 struct x25_sock *x25;
519 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
520
521 if (!sk)
522 goto out;
523
524 sock_init_data(NULL, sk);
525
526 x25 = x25_sk(sk);
527 skb_queue_head_init(&x25->ack_queue);
528 skb_queue_head_init(&x25->fragment_queue);
529 skb_queue_head_init(&x25->interrupt_in_queue);
530 skb_queue_head_init(&x25->interrupt_out_queue);
531 out:
532 return sk;
533 }
534
535 static int x25_create(struct net *net, struct socket *sock, int protocol,
536 int kern)
537 {
538 struct sock *sk;
539 struct x25_sock *x25;
540 int rc = -EAFNOSUPPORT;
541
542 if (!net_eq(net, &init_net))
543 goto out;
544
545 rc = -ESOCKTNOSUPPORT;
546 if (sock->type != SOCK_SEQPACKET)
547 goto out;
548
549 rc = -EINVAL;
550 if (protocol)
551 goto out;
552
553 rc = -ENOBUFS;
554 if ((sk = x25_alloc_socket(net, kern)) == NULL)
555 goto out;
556
557 x25 = x25_sk(sk);
558
559 sock_init_data(sock, sk);
560
561 x25_init_timers(sk);
562
563 sock->ops = &x25_proto_ops;
564 sk->sk_protocol = protocol;
565 sk->sk_backlog_rcv = x25_backlog_rcv;
566
567 x25->t21 = sysctl_x25_call_request_timeout;
568 x25->t22 = sysctl_x25_reset_request_timeout;
569 x25->t23 = sysctl_x25_clear_request_timeout;
570 x25->t2 = sysctl_x25_ack_holdback_timeout;
571 x25->state = X25_STATE_0;
572 x25->cudmatchlength = 0;
573 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
574 /* on call accept */
575
576 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
577 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
578 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
579 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
580 x25->facilities.throughput = 0; /* by default don't negotiate
581 throughput */
582 x25->facilities.reverse = X25_DEFAULT_REVERSE;
583 x25->dte_facilities.calling_len = 0;
584 x25->dte_facilities.called_len = 0;
585 memset(x25->dte_facilities.called_ae, '\0',
586 sizeof(x25->dte_facilities.called_ae));
587 memset(x25->dte_facilities.calling_ae, '\0',
588 sizeof(x25->dte_facilities.calling_ae));
589
590 rc = 0;
591 out:
592 return rc;
593 }
594
595 static struct sock *x25_make_new(struct sock *osk)
596 {
597 struct sock *sk = NULL;
598 struct x25_sock *x25, *ox25;
599
600 if (osk->sk_type != SOCK_SEQPACKET)
601 goto out;
602
603 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
604 goto out;
605
606 x25 = x25_sk(sk);
607
608 sk->sk_type = osk->sk_type;
609 sk->sk_priority = osk->sk_priority;
610 sk->sk_protocol = osk->sk_protocol;
611 sk->sk_rcvbuf = osk->sk_rcvbuf;
612 sk->sk_sndbuf = osk->sk_sndbuf;
613 sk->sk_state = TCP_ESTABLISHED;
614 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
615 sock_copy_flags(sk, osk);
616
617 ox25 = x25_sk(osk);
618 x25->t21 = ox25->t21;
619 x25->t22 = ox25->t22;
620 x25->t23 = ox25->t23;
621 x25->t2 = ox25->t2;
622 x25->flags = ox25->flags;
623 x25->facilities = ox25->facilities;
624 x25->dte_facilities = ox25->dte_facilities;
625 x25->cudmatchlength = ox25->cudmatchlength;
626
627 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
628 x25_init_timers(sk);
629 out:
630 return sk;
631 }
632
633 static int x25_release(struct socket *sock)
634 {
635 struct sock *sk = sock->sk;
636 struct x25_sock *x25;
637
638 if (!sk)
639 return 0;
640
641 x25 = x25_sk(sk);
642
643 sock_hold(sk);
644 lock_sock(sk);
645 switch (x25->state) {
646
647 case X25_STATE_0:
648 case X25_STATE_2:
649 x25_disconnect(sk, 0, 0, 0);
650 __x25_destroy_socket(sk);
651 goto out;
652
653 case X25_STATE_1:
654 case X25_STATE_3:
655 case X25_STATE_4:
656 x25_clear_queues(sk);
657 x25_write_internal(sk, X25_CLEAR_REQUEST);
658 x25_start_t23timer(sk);
659 x25->state = X25_STATE_2;
660 sk->sk_state = TCP_CLOSE;
661 sk->sk_shutdown |= SEND_SHUTDOWN;
662 sk->sk_state_change(sk);
663 sock_set_flag(sk, SOCK_DEAD);
664 sock_set_flag(sk, SOCK_DESTROY);
665 break;
666 }
667
668 sock_orphan(sk);
669 out:
670 release_sock(sk);
671 sock_put(sk);
672 return 0;
673 }
674
675 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
676 {
677 struct sock *sk = sock->sk;
678 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
679 int len, i, rc = 0;
680
681 if (!sock_flag(sk, SOCK_ZAPPED) ||
682 addr_len != sizeof(struct sockaddr_x25) ||
683 addr->sx25_family != AF_X25) {
684 rc = -EINVAL;
685 goto out;
686 }
687
688 len = strlen(addr->sx25_addr.x25_addr);
689 for (i = 0; i < len; i++) {
690 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
691 rc = -EINVAL;
692 goto out;
693 }
694 }
695
696 lock_sock(sk);
697 x25_sk(sk)->source_addr = addr->sx25_addr;
698 x25_insert_socket(sk);
699 sock_reset_flag(sk, SOCK_ZAPPED);
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 sk->sk_state = TCP_CLOSE;
761 sock->state = SS_UNCONNECTED;
762
763 rc = -EINVAL;
764 if (addr_len != sizeof(struct sockaddr_x25) ||
765 addr->sx25_family != AF_X25)
766 goto out;
767
768 rc = -ENETUNREACH;
769 rt = x25_get_route(&addr->sx25_addr);
770 if (!rt)
771 goto out;
772
773 x25->neighbour = x25_get_neigh(rt->dev);
774 if (!x25->neighbour)
775 goto out_put_route;
776
777 x25_limit_facilities(&x25->facilities, x25->neighbour);
778
779 x25->lci = x25_new_lci(x25->neighbour);
780 if (!x25->lci)
781 goto out_put_neigh;
782
783 rc = -EINVAL;
784 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
785 goto out_put_neigh;
786
787 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
788 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
789
790 x25->dest_addr = addr->sx25_addr;
791
792 /* Move to connecting socket, start sending Connect Requests */
793 sock->state = SS_CONNECTING;
794 sk->sk_state = TCP_SYN_SENT;
795
796 x25->state = X25_STATE_1;
797
798 x25_write_internal(sk, X25_CALL_REQUEST);
799
800 x25_start_heartbeat(sk);
801 x25_start_t21timer(sk);
802
803 /* Now the loop */
804 rc = -EINPROGRESS;
805 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
806 goto out_put_neigh;
807
808 rc = x25_wait_for_connection_establishment(sk);
809 if (rc)
810 goto out_put_neigh;
811
812 sock->state = SS_CONNECTED;
813 rc = 0;
814 out_put_neigh:
815 if (rc) {
816 read_lock_bh(&x25_list_lock);
817 x25_neigh_put(x25->neighbour);
818 x25->neighbour = NULL;
819 read_unlock_bh(&x25_list_lock);
820 }
821 out_put_route:
822 x25_route_put(rt);
823 out:
824 release_sock(sk);
825 return rc;
826 }
827
828 static int x25_wait_for_data(struct sock *sk, long timeout)
829 {
830 DECLARE_WAITQUEUE(wait, current);
831 int rc = 0;
832
833 add_wait_queue_exclusive(sk_sleep(sk), &wait);
834 for (;;) {
835 __set_current_state(TASK_INTERRUPTIBLE);
836 if (sk->sk_shutdown & RCV_SHUTDOWN)
837 break;
838 rc = -ERESTARTSYS;
839 if (signal_pending(current))
840 break;
841 rc = -EAGAIN;
842 if (!timeout)
843 break;
844 rc = 0;
845 if (skb_queue_empty(&sk->sk_receive_queue)) {
846 release_sock(sk);
847 timeout = schedule_timeout(timeout);
848 lock_sock(sk);
849 } else
850 break;
851 }
852 __set_current_state(TASK_RUNNING);
853 remove_wait_queue(sk_sleep(sk), &wait);
854 return rc;
855 }
856
857 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
858 bool kern)
859 {
860 struct sock *sk = sock->sk;
861 struct sock *newsk;
862 struct sk_buff *skb;
863 int rc = -EINVAL;
864
865 if (!sk)
866 goto out;
867
868 rc = -EOPNOTSUPP;
869 if (sk->sk_type != SOCK_SEQPACKET)
870 goto out;
871
872 lock_sock(sk);
873 rc = -EINVAL;
874 if (sk->sk_state != TCP_LISTEN)
875 goto out2;
876
877 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
878 if (rc)
879 goto out2;
880 skb = skb_dequeue(&sk->sk_receive_queue);
881 rc = -EINVAL;
882 if (!skb->sk)
883 goto out2;
884 newsk = skb->sk;
885 sock_graft(newsk, newsock);
886
887 /* Now attach up the new socket */
888 skb->sk = NULL;
889 kfree_skb(skb);
890 sk->sk_ack_backlog--;
891 newsock->state = SS_CONNECTED;
892 rc = 0;
893 out2:
894 release_sock(sk);
895 out:
896 return rc;
897 }
898
899 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
900 int *uaddr_len, int peer)
901 {
902 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
903 struct sock *sk = sock->sk;
904 struct x25_sock *x25 = x25_sk(sk);
905 int rc = 0;
906
907 if (peer) {
908 if (sk->sk_state != TCP_ESTABLISHED) {
909 rc = -ENOTCONN;
910 goto out;
911 }
912 sx25->sx25_addr = x25->dest_addr;
913 } else
914 sx25->sx25_addr = x25->source_addr;
915
916 sx25->sx25_family = AF_X25;
917 *uaddr_len = sizeof(*sx25);
918
919 out:
920 return rc;
921 }
922
923 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
924 unsigned int lci)
925 {
926 struct sock *sk;
927 struct sock *make;
928 struct x25_sock *makex25;
929 struct x25_address source_addr, dest_addr;
930 struct x25_facilities facilities;
931 struct x25_dte_facilities dte_facilities;
932 int len, addr_len, rc;
933
934 /*
935 * Remove the LCI and frame type.
936 */
937 skb_pull(skb, X25_STD_MIN_LEN);
938
939 /*
940 * Extract the X.25 addresses and convert them to ASCII strings,
941 * and remove them.
942 *
943 * Address block is mandatory in call request packets
944 */
945 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
946 if (addr_len <= 0)
947 goto out_clear_request;
948 skb_pull(skb, addr_len);
949
950 /*
951 * Get the length of the facilities, skip past them for the moment
952 * get the call user data because this is needed to determine
953 * the correct listener
954 *
955 * Facilities length is mandatory in call request packets
956 */
957 if (!pskb_may_pull(skb, 1))
958 goto out_clear_request;
959 len = skb->data[0] + 1;
960 if (!pskb_may_pull(skb, len))
961 goto out_clear_request;
962 skb_pull(skb,len);
963
964 /*
965 * Ensure that the amount of call user data is valid.
966 */
967 if (skb->len > X25_MAX_CUD_LEN)
968 goto out_clear_request;
969
970 /*
971 * Get all the call user data so it can be used in
972 * x25_find_listener and skb_copy_from_linear_data up ahead.
973 */
974 if (!pskb_may_pull(skb, skb->len))
975 goto out_clear_request;
976
977 /*
978 * Find a listener for the particular address/cud pair.
979 */
980 sk = x25_find_listener(&source_addr,skb);
981 skb_push(skb,len);
982
983 if (sk != NULL && sk_acceptq_is_full(sk)) {
984 goto out_sock_put;
985 }
986
987 /*
988 * We dont have any listeners for this incoming call.
989 * Try forwarding it.
990 */
991 if (sk == NULL) {
992 skb_push(skb, addr_len + X25_STD_MIN_LEN);
993 if (sysctl_x25_forward &&
994 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
995 {
996 /* Call was forwarded, dont process it any more */
997 kfree_skb(skb);
998 rc = 1;
999 goto out;
1000 } else {
1001 /* No listeners, can't forward, clear the call */
1002 goto out_clear_request;
1003 }
1004 }
1005
1006 /*
1007 * Try to reach a compromise on the requested facilities.
1008 */
1009 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1010 if (len == -1)
1011 goto out_sock_put;
1012
1013 /*
1014 * current neighbour/link might impose additional limits
1015 * on certain facilties
1016 */
1017
1018 x25_limit_facilities(&facilities, nb);
1019
1020 /*
1021 * Try to create a new socket.
1022 */
1023 make = x25_make_new(sk);
1024 if (!make)
1025 goto out_sock_put;
1026
1027 /*
1028 * Remove the facilities
1029 */
1030 skb_pull(skb, len);
1031
1032 skb->sk = make;
1033 make->sk_state = TCP_ESTABLISHED;
1034
1035 makex25 = x25_sk(make);
1036 makex25->lci = lci;
1037 makex25->dest_addr = dest_addr;
1038 makex25->source_addr = source_addr;
1039 makex25->neighbour = nb;
1040 makex25->facilities = facilities;
1041 makex25->dte_facilities= dte_facilities;
1042 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1043 /* ensure no reverse facil on accept */
1044 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1045 /* ensure no calling address extension on accept */
1046 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1047 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1048
1049 /* Normally all calls are accepted immediately */
1050 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1051 x25_write_internal(make, X25_CALL_ACCEPTED);
1052 makex25->state = X25_STATE_3;
1053 }
1054
1055 /*
1056 * Incoming Call User Data.
1057 */
1058 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1059 makex25->calluserdata.cudlength = skb->len;
1060
1061 sk->sk_ack_backlog++;
1062
1063 x25_insert_socket(make);
1064
1065 skb_queue_head(&sk->sk_receive_queue, skb);
1066
1067 x25_start_heartbeat(make);
1068
1069 if (!sock_flag(sk, SOCK_DEAD))
1070 sk->sk_data_ready(sk);
1071 rc = 1;
1072 sock_put(sk);
1073 out:
1074 return rc;
1075 out_sock_put:
1076 sock_put(sk);
1077 out_clear_request:
1078 rc = 0;
1079 x25_transmit_clear_request(nb, lci, 0x01);
1080 goto out;
1081 }
1082
1083 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1084 {
1085 struct sock *sk = sock->sk;
1086 struct x25_sock *x25 = x25_sk(sk);
1087 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1088 struct sockaddr_x25 sx25;
1089 struct sk_buff *skb;
1090 unsigned char *asmptr;
1091 int noblock = msg->msg_flags & MSG_DONTWAIT;
1092 size_t size;
1093 int qbit = 0, rc = -EINVAL;
1094
1095 lock_sock(sk);
1096 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1097 goto out;
1098
1099 /* we currently don't support segmented records at the user interface */
1100 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1101 goto out;
1102
1103 rc = -EADDRNOTAVAIL;
1104 if (sock_flag(sk, SOCK_ZAPPED))
1105 goto out;
1106
1107 rc = -EPIPE;
1108 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1109 send_sig(SIGPIPE, current, 0);
1110 goto out;
1111 }
1112
1113 rc = -ENETUNREACH;
1114 if (!x25->neighbour)
1115 goto out;
1116
1117 if (usx25) {
1118 rc = -EINVAL;
1119 if (msg->msg_namelen < sizeof(sx25))
1120 goto out;
1121 memcpy(&sx25, usx25, sizeof(sx25));
1122 rc = -EISCONN;
1123 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1124 goto out;
1125 rc = -EINVAL;
1126 if (sx25.sx25_family != AF_X25)
1127 goto out;
1128 } else {
1129 /*
1130 * FIXME 1003.1g - if the socket is like this because
1131 * it has become closed (not started closed) we ought
1132 * to SIGPIPE, EPIPE;
1133 */
1134 rc = -ENOTCONN;
1135 if (sk->sk_state != TCP_ESTABLISHED)
1136 goto out;
1137
1138 sx25.sx25_family = AF_X25;
1139 sx25.sx25_addr = x25->dest_addr;
1140 }
1141
1142 /* Sanity check the packet size */
1143 if (len > 65535) {
1144 rc = -EMSGSIZE;
1145 goto out;
1146 }
1147
1148 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1149
1150 /* Build a packet */
1151 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1152
1153 if ((msg->msg_flags & MSG_OOB) && len > 32)
1154 len = 32;
1155
1156 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1157
1158 release_sock(sk);
1159 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1160 lock_sock(sk);
1161 if (!skb)
1162 goto out;
1163 X25_SKB_CB(skb)->flags = msg->msg_flags;
1164
1165 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1166
1167 /*
1168 * Put the data on the end
1169 */
1170 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1171
1172 skb_reset_transport_header(skb);
1173 skb_put(skb, len);
1174
1175 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1176 if (rc)
1177 goto out_kfree_skb;
1178
1179 /*
1180 * If the Q BIT Include socket option is in force, the first
1181 * byte of the user data is the logical value of the Q Bit.
1182 */
1183 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1184 if (!pskb_may_pull(skb, 1))
1185 goto out_kfree_skb;
1186
1187 qbit = skb->data[0];
1188 skb_pull(skb, 1);
1189 }
1190
1191 /*
1192 * Push down the X.25 header
1193 */
1194 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1195
1196 if (msg->msg_flags & MSG_OOB) {
1197 if (x25->neighbour->extended) {
1198 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1199 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1200 *asmptr++ = (x25->lci >> 0) & 0xFF;
1201 *asmptr++ = X25_INTERRUPT;
1202 } else {
1203 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1204 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1205 *asmptr++ = (x25->lci >> 0) & 0xFF;
1206 *asmptr++ = X25_INTERRUPT;
1207 }
1208 } else {
1209 if (x25->neighbour->extended) {
1210 /* Build an Extended X.25 header */
1211 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1212 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1213 *asmptr++ = (x25->lci >> 0) & 0xFF;
1214 *asmptr++ = X25_DATA;
1215 *asmptr++ = X25_DATA;
1216 } else {
1217 /* Build an Standard X.25 header */
1218 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1219 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1220 *asmptr++ = (x25->lci >> 0) & 0xFF;
1221 *asmptr++ = X25_DATA;
1222 }
1223
1224 if (qbit)
1225 skb->data[0] |= X25_Q_BIT;
1226 }
1227
1228 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1229 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1230
1231 rc = -ENOTCONN;
1232 if (sk->sk_state != TCP_ESTABLISHED)
1233 goto out_kfree_skb;
1234
1235 if (msg->msg_flags & MSG_OOB)
1236 skb_queue_tail(&x25->interrupt_out_queue, skb);
1237 else {
1238 rc = x25_output(sk, skb);
1239 len = rc;
1240 if (rc < 0)
1241 kfree_skb(skb);
1242 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1243 len++;
1244 }
1245
1246 x25_kick(sk);
1247 rc = len;
1248 out:
1249 release_sock(sk);
1250 return rc;
1251 out_kfree_skb:
1252 kfree_skb(skb);
1253 goto out;
1254 }
1255
1256
1257 static int x25_recvmsg(struct socket *sock, 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 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, 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_msg(skb, 0, msg, 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 msg->msg_namelen = sizeof(*sx25);
1347 }
1348
1349 x25_check_rbuf(sk);
1350 rc = copied;
1351 out_free_dgram:
1352 skb_free_datagram(sk, skb);
1353 out:
1354 release_sock(sk);
1355 return rc;
1356 }
1357
1358
1359 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1360 {
1361 struct sock *sk = sock->sk;
1362 struct x25_sock *x25 = x25_sk(sk);
1363 void __user *argp = (void __user *)arg;
1364 int rc;
1365
1366 switch (cmd) {
1367 case TIOCOUTQ: {
1368 int amount;
1369
1370 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1371 if (amount < 0)
1372 amount = 0;
1373 rc = put_user(amount, (unsigned int __user *)argp);
1374 break;
1375 }
1376
1377 case TIOCINQ: {
1378 struct sk_buff *skb;
1379 int amount = 0;
1380 /*
1381 * These two are safe on a single CPU system as
1382 * only user tasks fiddle here
1383 */
1384 lock_sock(sk);
1385 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1386 amount = skb->len;
1387 release_sock(sk);
1388 rc = put_user(amount, (unsigned int __user *)argp);
1389 break;
1390 }
1391
1392 case SIOCGSTAMP:
1393 rc = -EINVAL;
1394 if (sk)
1395 rc = sock_get_timestamp(sk,
1396 (struct timeval __user *)argp);
1397 break;
1398 case SIOCGSTAMPNS:
1399 rc = -EINVAL;
1400 if (sk)
1401 rc = sock_get_timestampns(sk,
1402 (struct timespec __user *)argp);
1403 break;
1404 case SIOCGIFADDR:
1405 case SIOCSIFADDR:
1406 case SIOCGIFDSTADDR:
1407 case SIOCSIFDSTADDR:
1408 case SIOCGIFBRDADDR:
1409 case SIOCSIFBRDADDR:
1410 case SIOCGIFNETMASK:
1411 case SIOCSIFNETMASK:
1412 case SIOCGIFMETRIC:
1413 case SIOCSIFMETRIC:
1414 rc = -EINVAL;
1415 break;
1416 case SIOCADDRT:
1417 case SIOCDELRT:
1418 rc = -EPERM;
1419 if (!capable(CAP_NET_ADMIN))
1420 break;
1421 rc = x25_route_ioctl(cmd, argp);
1422 break;
1423 case SIOCX25GSUBSCRIP:
1424 rc = x25_subscr_ioctl(cmd, argp);
1425 break;
1426 case SIOCX25SSUBSCRIP:
1427 rc = -EPERM;
1428 if (!capable(CAP_NET_ADMIN))
1429 break;
1430 rc = x25_subscr_ioctl(cmd, argp);
1431 break;
1432 case SIOCX25GFACILITIES: {
1433 lock_sock(sk);
1434 rc = copy_to_user(argp, &x25->facilities,
1435 sizeof(x25->facilities))
1436 ? -EFAULT : 0;
1437 release_sock(sk);
1438 break;
1439 }
1440
1441 case SIOCX25SFACILITIES: {
1442 struct x25_facilities facilities;
1443 rc = -EFAULT;
1444 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1445 break;
1446 rc = -EINVAL;
1447 lock_sock(sk);
1448 if (sk->sk_state != TCP_LISTEN &&
1449 sk->sk_state != TCP_CLOSE)
1450 goto out_fac_release;
1451 if (facilities.pacsize_in < X25_PS16 ||
1452 facilities.pacsize_in > X25_PS4096)
1453 goto out_fac_release;
1454 if (facilities.pacsize_out < X25_PS16 ||
1455 facilities.pacsize_out > X25_PS4096)
1456 goto out_fac_release;
1457 if (facilities.winsize_in < 1 ||
1458 facilities.winsize_in > 127)
1459 goto out_fac_release;
1460 if (facilities.throughput) {
1461 int out = facilities.throughput & 0xf0;
1462 int in = facilities.throughput & 0x0f;
1463 if (!out)
1464 facilities.throughput |=
1465 X25_DEFAULT_THROUGHPUT << 4;
1466 else if (out < 0x30 || out > 0xD0)
1467 goto out_fac_release;
1468 if (!in)
1469 facilities.throughput |=
1470 X25_DEFAULT_THROUGHPUT;
1471 else if (in < 0x03 || in > 0x0D)
1472 goto out_fac_release;
1473 }
1474 if (facilities.reverse &&
1475 (facilities.reverse & 0x81) != 0x81)
1476 goto out_fac_release;
1477 x25->facilities = facilities;
1478 rc = 0;
1479 out_fac_release:
1480 release_sock(sk);
1481 break;
1482 }
1483
1484 case SIOCX25GDTEFACILITIES: {
1485 lock_sock(sk);
1486 rc = copy_to_user(argp, &x25->dte_facilities,
1487 sizeof(x25->dte_facilities));
1488 release_sock(sk);
1489 if (rc)
1490 rc = -EFAULT;
1491 break;
1492 }
1493
1494 case SIOCX25SDTEFACILITIES: {
1495 struct x25_dte_facilities dtefacs;
1496 rc = -EFAULT;
1497 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1498 break;
1499 rc = -EINVAL;
1500 lock_sock(sk);
1501 if (sk->sk_state != TCP_LISTEN &&
1502 sk->sk_state != TCP_CLOSE)
1503 goto out_dtefac_release;
1504 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1505 goto out_dtefac_release;
1506 if (dtefacs.called_len > X25_MAX_AE_LEN)
1507 goto out_dtefac_release;
1508 x25->dte_facilities = dtefacs;
1509 rc = 0;
1510 out_dtefac_release:
1511 release_sock(sk);
1512 break;
1513 }
1514
1515 case SIOCX25GCALLUSERDATA: {
1516 lock_sock(sk);
1517 rc = copy_to_user(argp, &x25->calluserdata,
1518 sizeof(x25->calluserdata))
1519 ? -EFAULT : 0;
1520 release_sock(sk);
1521 break;
1522 }
1523
1524 case SIOCX25SCALLUSERDATA: {
1525 struct x25_calluserdata calluserdata;
1526
1527 rc = -EFAULT;
1528 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1529 break;
1530 rc = -EINVAL;
1531 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1532 break;
1533 lock_sock(sk);
1534 x25->calluserdata = calluserdata;
1535 release_sock(sk);
1536 rc = 0;
1537 break;
1538 }
1539
1540 case SIOCX25GCAUSEDIAG: {
1541 lock_sock(sk);
1542 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1543 ? -EFAULT : 0;
1544 release_sock(sk);
1545 break;
1546 }
1547
1548 case SIOCX25SCAUSEDIAG: {
1549 struct x25_causediag causediag;
1550 rc = -EFAULT;
1551 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1552 break;
1553 lock_sock(sk);
1554 x25->causediag = causediag;
1555 release_sock(sk);
1556 rc = 0;
1557 break;
1558
1559 }
1560
1561 case SIOCX25SCUDMATCHLEN: {
1562 struct x25_subaddr sub_addr;
1563 rc = -EINVAL;
1564 lock_sock(sk);
1565 if(sk->sk_state != TCP_CLOSE)
1566 goto out_cud_release;
1567 rc = -EFAULT;
1568 if (copy_from_user(&sub_addr, argp,
1569 sizeof(sub_addr)))
1570 goto out_cud_release;
1571 rc = -EINVAL;
1572 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1573 goto out_cud_release;
1574 x25->cudmatchlength = sub_addr.cudmatchlength;
1575 rc = 0;
1576 out_cud_release:
1577 release_sock(sk);
1578 break;
1579 }
1580
1581 case SIOCX25CALLACCPTAPPRV: {
1582 rc = -EINVAL;
1583 lock_sock(sk);
1584 if (sk->sk_state == TCP_CLOSE) {
1585 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1586 rc = 0;
1587 }
1588 release_sock(sk);
1589 break;
1590 }
1591
1592 case SIOCX25SENDCALLACCPT: {
1593 rc = -EINVAL;
1594 lock_sock(sk);
1595 if (sk->sk_state != TCP_ESTABLISHED)
1596 goto out_sendcallaccpt_release;
1597 /* must call accptapprv above */
1598 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1599 goto out_sendcallaccpt_release;
1600 x25_write_internal(sk, X25_CALL_ACCEPTED);
1601 x25->state = X25_STATE_3;
1602 rc = 0;
1603 out_sendcallaccpt_release:
1604 release_sock(sk);
1605 break;
1606 }
1607
1608 default:
1609 rc = -ENOIOCTLCMD;
1610 break;
1611 }
1612
1613 return rc;
1614 }
1615
1616 static const struct net_proto_family x25_family_ops = {
1617 .family = AF_X25,
1618 .create = x25_create,
1619 .owner = THIS_MODULE,
1620 };
1621
1622 #ifdef CONFIG_COMPAT
1623 static int compat_x25_subscr_ioctl(unsigned int cmd,
1624 struct compat_x25_subscrip_struct __user *x25_subscr32)
1625 {
1626 struct compat_x25_subscrip_struct x25_subscr;
1627 struct x25_neigh *nb;
1628 struct net_device *dev;
1629 int rc = -EINVAL;
1630
1631 rc = -EFAULT;
1632 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1633 goto out;
1634
1635 rc = -EINVAL;
1636 dev = x25_dev_get(x25_subscr.device);
1637 if (dev == NULL)
1638 goto out;
1639
1640 nb = x25_get_neigh(dev);
1641 if (nb == NULL)
1642 goto out_dev_put;
1643
1644 dev_put(dev);
1645
1646 if (cmd == SIOCX25GSUBSCRIP) {
1647 read_lock_bh(&x25_neigh_list_lock);
1648 x25_subscr.extended = nb->extended;
1649 x25_subscr.global_facil_mask = nb->global_facil_mask;
1650 read_unlock_bh(&x25_neigh_list_lock);
1651 rc = copy_to_user(x25_subscr32, &x25_subscr,
1652 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1653 } else {
1654 rc = -EINVAL;
1655 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1656 rc = 0;
1657 write_lock_bh(&x25_neigh_list_lock);
1658 nb->extended = x25_subscr.extended;
1659 nb->global_facil_mask = x25_subscr.global_facil_mask;
1660 write_unlock_bh(&x25_neigh_list_lock);
1661 }
1662 }
1663 x25_neigh_put(nb);
1664 out:
1665 return rc;
1666 out_dev_put:
1667 dev_put(dev);
1668 goto out;
1669 }
1670
1671 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1672 unsigned long arg)
1673 {
1674 void __user *argp = compat_ptr(arg);
1675 struct sock *sk = sock->sk;
1676
1677 int rc = -ENOIOCTLCMD;
1678
1679 switch(cmd) {
1680 case TIOCOUTQ:
1681 case TIOCINQ:
1682 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1683 break;
1684 case SIOCGSTAMP:
1685 rc = -EINVAL;
1686 if (sk)
1687 rc = compat_sock_get_timestamp(sk,
1688 (struct timeval __user*)argp);
1689 break;
1690 case SIOCGSTAMPNS:
1691 rc = -EINVAL;
1692 if (sk)
1693 rc = compat_sock_get_timestampns(sk,
1694 (struct timespec __user*)argp);
1695 break;
1696 case SIOCGIFADDR:
1697 case SIOCSIFADDR:
1698 case SIOCGIFDSTADDR:
1699 case SIOCSIFDSTADDR:
1700 case SIOCGIFBRDADDR:
1701 case SIOCSIFBRDADDR:
1702 case SIOCGIFNETMASK:
1703 case SIOCSIFNETMASK:
1704 case SIOCGIFMETRIC:
1705 case SIOCSIFMETRIC:
1706 rc = -EINVAL;
1707 break;
1708 case SIOCADDRT:
1709 case SIOCDELRT:
1710 rc = -EPERM;
1711 if (!capable(CAP_NET_ADMIN))
1712 break;
1713 rc = x25_route_ioctl(cmd, argp);
1714 break;
1715 case SIOCX25GSUBSCRIP:
1716 rc = compat_x25_subscr_ioctl(cmd, argp);
1717 break;
1718 case SIOCX25SSUBSCRIP:
1719 rc = -EPERM;
1720 if (!capable(CAP_NET_ADMIN))
1721 break;
1722 rc = compat_x25_subscr_ioctl(cmd, argp);
1723 break;
1724 case SIOCX25GFACILITIES:
1725 case SIOCX25SFACILITIES:
1726 case SIOCX25GDTEFACILITIES:
1727 case SIOCX25SDTEFACILITIES:
1728 case SIOCX25GCALLUSERDATA:
1729 case SIOCX25SCALLUSERDATA:
1730 case SIOCX25GCAUSEDIAG:
1731 case SIOCX25SCAUSEDIAG:
1732 case SIOCX25SCUDMATCHLEN:
1733 case SIOCX25CALLACCPTAPPRV:
1734 case SIOCX25SENDCALLACCPT:
1735 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1736 break;
1737 default:
1738 rc = -ENOIOCTLCMD;
1739 break;
1740 }
1741 return rc;
1742 }
1743 #endif
1744
1745 static const struct proto_ops x25_proto_ops = {
1746 .family = AF_X25,
1747 .owner = THIS_MODULE,
1748 .release = x25_release,
1749 .bind = x25_bind,
1750 .connect = x25_connect,
1751 .socketpair = sock_no_socketpair,
1752 .accept = x25_accept,
1753 .getname = x25_getname,
1754 .poll = datagram_poll,
1755 .ioctl = x25_ioctl,
1756 #ifdef CONFIG_COMPAT
1757 .compat_ioctl = compat_x25_ioctl,
1758 #endif
1759 .listen = x25_listen,
1760 .shutdown = sock_no_shutdown,
1761 .setsockopt = x25_setsockopt,
1762 .getsockopt = x25_getsockopt,
1763 .sendmsg = x25_sendmsg,
1764 .recvmsg = x25_recvmsg,
1765 .mmap = sock_no_mmap,
1766 .sendpage = sock_no_sendpage,
1767 };
1768
1769 static struct packet_type x25_packet_type __read_mostly = {
1770 .type = cpu_to_be16(ETH_P_X25),
1771 .func = x25_lapb_receive_frame,
1772 };
1773
1774 static struct notifier_block x25_dev_notifier = {
1775 .notifier_call = x25_device_event,
1776 };
1777
1778 void x25_kill_by_neigh(struct x25_neigh *nb)
1779 {
1780 struct sock *s;
1781
1782 write_lock_bh(&x25_list_lock);
1783
1784 sk_for_each(s, &x25_list)
1785 if (x25_sk(s)->neighbour == nb)
1786 x25_disconnect(s, ENETUNREACH, 0, 0);
1787
1788 write_unlock_bh(&x25_list_lock);
1789
1790 /* Remove any related forwards */
1791 x25_clear_forward_by_dev(nb->dev);
1792 }
1793
1794 static int __init x25_init(void)
1795 {
1796 int rc;
1797
1798 rc = proto_register(&x25_proto, 0);
1799 if (rc)
1800 goto out;
1801
1802 rc = sock_register(&x25_family_ops);
1803 if (rc)
1804 goto out_proto;
1805
1806 dev_add_pack(&x25_packet_type);
1807
1808 rc = register_netdevice_notifier(&x25_dev_notifier);
1809 if (rc)
1810 goto out_sock;
1811
1812 rc = x25_register_sysctl();
1813 if (rc)
1814 goto out_dev;
1815
1816 rc = x25_proc_init();
1817 if (rc)
1818 goto out_sysctl;
1819
1820 pr_info("Linux Version 0.2\n");
1821
1822 out:
1823 return rc;
1824 out_sysctl:
1825 x25_unregister_sysctl();
1826 out_dev:
1827 unregister_netdevice_notifier(&x25_dev_notifier);
1828 out_sock:
1829 dev_remove_pack(&x25_packet_type);
1830 sock_unregister(AF_X25);
1831 out_proto:
1832 proto_unregister(&x25_proto);
1833 goto out;
1834 }
1835 module_init(x25_init);
1836
1837 static void __exit x25_exit(void)
1838 {
1839 x25_proc_exit();
1840 x25_link_free();
1841 x25_route_free();
1842
1843 x25_unregister_sysctl();
1844
1845 unregister_netdevice_notifier(&x25_dev_notifier);
1846
1847 dev_remove_pack(&x25_packet_type);
1848
1849 sock_unregister(AF_X25);
1850 proto_unregister(&x25_proto);
1851 }
1852 module_exit(x25_exit);
1853
1854 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1855 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1856 MODULE_LICENSE("GPL");
1857 MODULE_ALIAS_NETPROTO(PF_X25);
Linux kernel stable tree