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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) + '0';
138 p++;
139 } else {
140 *called++ = ((*p >> 4) & 0x0F) + '0';
141 }
142 } else {
143 if (i % 2 != 0) {
144 *calling++ = ((*p >> 0) & 0x0F) + '0';
145 p++;
146 } else {
147 *calling++ = ((*p >> 4) & 0x0F) + '0';
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') << 0;
176 p++;
177 } else {
178 *p = 0x00;
179 *p |= (*called++ - '0') << 4;
180 }
181 } else {
182 if (i % 2 != 0) {
183 *p |= (*calling++ - '0') << 0;
184 p++;
185 } else {
186 *p = 0x00;
187 *p |= (*calling++ - '0') << 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
212 write_lock_bh(&x25_list_lock);
213
214 sk_for_each(s, &x25_list)
215 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
216 x25_disconnect(s, ENETUNREACH, 0, 0);
217
218 write_unlock_bh(&x25_list_lock);
219 }
220
221 /*
222 * Handle device status changes.
223 */
224 static int x25_device_event(struct notifier_block *this, unsigned long event,
225 void *ptr)
226 {
227 struct net_device *dev = ptr;
228 struct x25_neigh *nb;
229
230 if (!net_eq(dev_net(dev), &init_net))
231 return NOTIFY_DONE;
232
233 if (dev->type == ARPHRD_X25
234 #if IS_ENABLED(CONFIG_LLC)
235 || dev->type == ARPHRD_ETHER
236 #endif
237 ) {
238 switch (event) {
239 case NETDEV_UP:
240 x25_link_device_up(dev);
241 break;
242 case NETDEV_GOING_DOWN:
243 nb = x25_get_neigh(dev);
244 if (nb) {
245 x25_terminate_link(nb);
246 x25_neigh_put(nb);
247 }
248 break;
249 case NETDEV_DOWN:
250 x25_kill_by_device(dev);
251 x25_route_device_down(dev);
252 x25_link_device_down(dev);
253 break;
254 }
255 }
256
257 return NOTIFY_DONE;
258 }
259
260 /*
261 * Add a socket to the bound sockets list.
262 */
263 static void x25_insert_socket(struct sock *sk)
264 {
265 write_lock_bh(&x25_list_lock);
266 sk_add_node(sk, &x25_list);
267 write_unlock_bh(&x25_list_lock);
268 }
269
270 /*
271 * Find a socket that wants to accept the Call Request we just
272 * received. Check the full list for an address/cud match.
273 * If no cuds match return the next_best thing, an address match.
274 * Note: if a listening socket has cud set it must only get calls
275 * with matching cud.
276 */
277 static struct sock *x25_find_listener(struct x25_address *addr,
278 struct sk_buff *skb)
279 {
280 struct sock *s;
281 struct sock *next_best;
282
283 read_lock_bh(&x25_list_lock);
284 next_best = NULL;
285
286 sk_for_each(s, &x25_list)
287 if ((!strcmp(addr->x25_addr,
288 x25_sk(s)->source_addr.x25_addr) ||
289 !strcmp(addr->x25_addr,
290 null_x25_address.x25_addr)) &&
291 s->sk_state == TCP_LISTEN) {
292 /*
293 * Found a listening socket, now check the incoming
294 * call user data vs this sockets call user data
295 */
296 if (x25_sk(s)->cudmatchlength > 0 &&
297 skb->len >= x25_sk(s)->cudmatchlength) {
298 if((memcmp(x25_sk(s)->calluserdata.cuddata,
299 skb->data,
300 x25_sk(s)->cudmatchlength)) == 0) {
301 sock_hold(s);
302 goto found;
303 }
304 } else
305 next_best = s;
306 }
307 if (next_best) {
308 s = next_best;
309 sock_hold(s);
310 goto found;
311 }
312 s = NULL;
313 found:
314 read_unlock_bh(&x25_list_lock);
315 return s;
316 }
317
318 /*
319 * Find a connected X.25 socket given my LCI and neighbour.
320 */
321 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
322 {
323 struct sock *s;
324
325 sk_for_each(s, &x25_list)
326 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
327 sock_hold(s);
328 goto found;
329 }
330 s = NULL;
331 found:
332 return s;
333 }
334
335 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
336 {
337 struct sock *s;
338
339 read_lock_bh(&x25_list_lock);
340 s = __x25_find_socket(lci, nb);
341 read_unlock_bh(&x25_list_lock);
342 return s;
343 }
344
345 /*
346 * Find a unique LCI for a given device.
347 */
348 static unsigned int x25_new_lci(struct x25_neigh *nb)
349 {
350 unsigned int lci = 1;
351 struct sock *sk;
352
353 read_lock_bh(&x25_list_lock);
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 }
362
363 read_unlock_bh(&x25_list_lock);
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)
517 {
518 struct x25_sock *x25;
519 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
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)) == 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))) == 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 x25_neigh_put(x25->neighbour);
817 out_put_route:
818 x25_route_put(rt);
819 out:
820 release_sock(sk);
821 return rc;
822 }
823
824 static int x25_wait_for_data(struct sock *sk, long timeout)
825 {
826 DECLARE_WAITQUEUE(wait, current);
827 int rc = 0;
828
829 add_wait_queue_exclusive(sk_sleep(sk), &wait);
830 for (;;) {
831 __set_current_state(TASK_INTERRUPTIBLE);
832 if (sk->sk_shutdown & RCV_SHUTDOWN)
833 break;
834 rc = -ERESTARTSYS;
835 if (signal_pending(current))
836 break;
837 rc = -EAGAIN;
838 if (!timeout)
839 break;
840 rc = 0;
841 if (skb_queue_empty(&sk->sk_receive_queue)) {
842 release_sock(sk);
843 timeout = schedule_timeout(timeout);
844 lock_sock(sk);
845 } else
846 break;
847 }
848 __set_current_state(TASK_RUNNING);
849 remove_wait_queue(sk_sleep(sk), &wait);
850 return rc;
851 }
852
853 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
854 {
855 struct sock *sk = sock->sk;
856 struct sock *newsk;
857 struct sk_buff *skb;
858 int rc = -EINVAL;
859
860 if (!sk)
861 goto out;
862
863 rc = -EOPNOTSUPP;
864 if (sk->sk_type != SOCK_SEQPACKET)
865 goto out;
866
867 lock_sock(sk);
868 rc = -EINVAL;
869 if (sk->sk_state != TCP_LISTEN)
870 goto out2;
871
872 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
873 if (rc)
874 goto out2;
875 skb = skb_dequeue(&sk->sk_receive_queue);
876 rc = -EINVAL;
877 if (!skb->sk)
878 goto out2;
879 newsk = skb->sk;
880 sock_graft(newsk, newsock);
881
882 /* Now attach up the new socket */
883 skb->sk = NULL;
884 kfree_skb(skb);
885 sk->sk_ack_backlog--;
886 newsock->state = SS_CONNECTED;
887 rc = 0;
888 out2:
889 release_sock(sk);
890 out:
891 return rc;
892 }
893
894 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
895 int *uaddr_len, int peer)
896 {
897 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
898 struct sock *sk = sock->sk;
899 struct x25_sock *x25 = x25_sk(sk);
900 int rc = 0;
901
902 if (peer) {
903 if (sk->sk_state != TCP_ESTABLISHED) {
904 rc = -ENOTCONN;
905 goto out;
906 }
907 sx25->sx25_addr = x25->dest_addr;
908 } else
909 sx25->sx25_addr = x25->source_addr;
910
911 sx25->sx25_family = AF_X25;
912 *uaddr_len = sizeof(*sx25);
913
914 out:
915 return rc;
916 }
917
918 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
919 unsigned int lci)
920 {
921 struct sock *sk;
922 struct sock *make;
923 struct x25_sock *makex25;
924 struct x25_address source_addr, dest_addr;
925 struct x25_facilities facilities;
926 struct x25_dte_facilities dte_facilities;
927 int len, addr_len, rc;
928
929 /*
930 * Remove the LCI and frame type.
931 */
932 skb_pull(skb, X25_STD_MIN_LEN);
933
934 /*
935 * Extract the X.25 addresses and convert them to ASCII strings,
936 * and remove them.
937 *
938 * Address block is mandatory in call request packets
939 */
940 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
941 if (addr_len <= 0)
942 goto out_clear_request;
943 skb_pull(skb, addr_len);
944
945 /*
946 * Get the length of the facilities, skip past them for the moment
947 * get the call user data because this is needed to determine
948 * the correct listener
949 *
950 * Facilities length is mandatory in call request packets
951 */
952 if (!pskb_may_pull(skb, 1))
953 goto out_clear_request;
954 len = skb->data[0] + 1;
955 if (!pskb_may_pull(skb, len))
956 goto out_clear_request;
957 skb_pull(skb,len);
958
959 /*
960 * Ensure that the amount of call user data is valid.
961 */
962 if (skb->len > X25_MAX_CUD_LEN)
963 goto out_clear_request;
964
965 /*
966 * Get all the call user data so it can be used in
967 * x25_find_listener and skb_copy_from_linear_data up ahead.
968 */
969 if (!pskb_may_pull(skb, skb->len))
970 goto out_clear_request;
971
972 /*
973 * Find a listener for the particular address/cud pair.
974 */
975 sk = x25_find_listener(&source_addr,skb);
976 skb_push(skb,len);
977
978 if (sk != NULL && sk_acceptq_is_full(sk)) {
979 goto out_sock_put;
980 }
981
982 /*
983 * We dont have any listeners for this incoming call.
984 * Try forwarding it.
985 */
986 if (sk == NULL) {
987 skb_push(skb, addr_len + X25_STD_MIN_LEN);
988 if (sysctl_x25_forward &&
989 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
990 {
991 /* Call was forwarded, dont process it any more */
992 kfree_skb(skb);
993 rc = 1;
994 goto out;
995 } else {
996 /* No listeners, can't forward, clear the call */
997 goto out_clear_request;
998 }
999 }
1000
1001 /*
1002 * Try to reach a compromise on the requested facilities.
1003 */
1004 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1005 if (len == -1)
1006 goto out_sock_put;
1007
1008 /*
1009 * current neighbour/link might impose additional limits
1010 * on certain facilties
1011 */
1012
1013 x25_limit_facilities(&facilities, nb);
1014
1015 /*
1016 * Try to create a new socket.
1017 */
1018 make = x25_make_new(sk);
1019 if (!make)
1020 goto out_sock_put;
1021
1022 /*
1023 * Remove the facilities
1024 */
1025 skb_pull(skb, len);
1026
1027 skb->sk = make;
1028 make->sk_state = TCP_ESTABLISHED;
1029
1030 makex25 = x25_sk(make);
1031 makex25->lci = lci;
1032 makex25->dest_addr = dest_addr;
1033 makex25->source_addr = source_addr;
1034 makex25->neighbour = nb;
1035 makex25->facilities = facilities;
1036 makex25->dte_facilities= dte_facilities;
1037 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1038 /* ensure no reverse facil on accept */
1039 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1040 /* ensure no calling address extension on accept */
1041 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1042 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1043
1044 /* Normally all calls are accepted immediately */
1045 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1046 x25_write_internal(make, X25_CALL_ACCEPTED);
1047 makex25->state = X25_STATE_3;
1048 }
1049
1050 /*
1051 * Incoming Call User Data.
1052 */
1053 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1054 makex25->calluserdata.cudlength = skb->len;
1055
1056 sk->sk_ack_backlog++;
1057
1058 x25_insert_socket(make);
1059
1060 skb_queue_head(&sk->sk_receive_queue, skb);
1061
1062 x25_start_heartbeat(make);
1063
1064 if (!sock_flag(sk, SOCK_DEAD))
1065 sk->sk_data_ready(sk, skb->len);
1066 rc = 1;
1067 sock_put(sk);
1068 out:
1069 return rc;
1070 out_sock_put:
1071 sock_put(sk);
1072 out_clear_request:
1073 rc = 0;
1074 x25_transmit_clear_request(nb, lci, 0x01);
1075 goto out;
1076 }
1077
1078 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1079 struct msghdr *msg, size_t len)
1080 {
1081 struct sock *sk = sock->sk;
1082 struct x25_sock *x25 = x25_sk(sk);
1083 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1084 struct sockaddr_x25 sx25;
1085 struct sk_buff *skb;
1086 unsigned char *asmptr;
1087 int noblock = msg->msg_flags & MSG_DONTWAIT;
1088 size_t size;
1089 int qbit = 0, rc = -EINVAL;
1090
1091 lock_sock(sk);
1092 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1093 goto out;
1094
1095 /* we currently don't support segmented records at the user interface */
1096 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1097 goto out;
1098
1099 rc = -EADDRNOTAVAIL;
1100 if (sock_flag(sk, SOCK_ZAPPED))
1101 goto out;
1102
1103 rc = -EPIPE;
1104 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1105 send_sig(SIGPIPE, current, 0);
1106 goto out;
1107 }
1108
1109 rc = -ENETUNREACH;
1110 if (!x25->neighbour)
1111 goto out;
1112
1113 if (usx25) {
1114 rc = -EINVAL;
1115 if (msg->msg_namelen < sizeof(sx25))
1116 goto out;
1117 memcpy(&sx25, usx25, sizeof(sx25));
1118 rc = -EISCONN;
1119 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1120 goto out;
1121 rc = -EINVAL;
1122 if (sx25.sx25_family != AF_X25)
1123 goto out;
1124 } else {
1125 /*
1126 * FIXME 1003.1g - if the socket is like this because
1127 * it has become closed (not started closed) we ought
1128 * to SIGPIPE, EPIPE;
1129 */
1130 rc = -ENOTCONN;
1131 if (sk->sk_state != TCP_ESTABLISHED)
1132 goto out;
1133
1134 sx25.sx25_family = AF_X25;
1135 sx25.sx25_addr = x25->dest_addr;
1136 }
1137
1138 /* Sanity check the packet size */
1139 if (len > 65535) {
1140 rc = -EMSGSIZE;
1141 goto out;
1142 }
1143
1144 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1145
1146 /* Build a packet */
1147 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1148
1149 if ((msg->msg_flags & MSG_OOB) && len > 32)
1150 len = 32;
1151
1152 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1153
1154 release_sock(sk);
1155 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1156 lock_sock(sk);
1157 if (!skb)
1158 goto out;
1159 X25_SKB_CB(skb)->flags = msg->msg_flags;
1160
1161 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1162
1163 /*
1164 * Put the data on the end
1165 */
1166 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1167
1168 skb_reset_transport_header(skb);
1169 skb_put(skb, len);
1170
1171 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1172 if (rc)
1173 goto out_kfree_skb;
1174
1175 /*
1176 * If the Q BIT Include socket option is in force, the first
1177 * byte of the user data is the logical value of the Q Bit.
1178 */
1179 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1180 if (!pskb_may_pull(skb, 1))
1181 goto out_kfree_skb;
1182
1183 qbit = skb->data[0];
1184 skb_pull(skb, 1);
1185 }
1186
1187 /*
1188 * Push down the X.25 header
1189 */
1190 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1191
1192 if (msg->msg_flags & MSG_OOB) {
1193 if (x25->neighbour->extended) {
1194 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1195 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1196 *asmptr++ = (x25->lci >> 0) & 0xFF;
1197 *asmptr++ = X25_INTERRUPT;
1198 } else {
1199 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1200 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1201 *asmptr++ = (x25->lci >> 0) & 0xFF;
1202 *asmptr++ = X25_INTERRUPT;
1203 }
1204 } else {
1205 if (x25->neighbour->extended) {
1206 /* Build an Extended X.25 header */
1207 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209 *asmptr++ = (x25->lci >> 0) & 0xFF;
1210 *asmptr++ = X25_DATA;
1211 *asmptr++ = X25_DATA;
1212 } else {
1213 /* Build an Standard X.25 header */
1214 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1216 *asmptr++ = (x25->lci >> 0) & 0xFF;
1217 *asmptr++ = X25_DATA;
1218 }
1219
1220 if (qbit)
1221 skb->data[0] |= X25_Q_BIT;
1222 }
1223
1224 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1225 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1226
1227 rc = -ENOTCONN;
1228 if (sk->sk_state != TCP_ESTABLISHED)
1229 goto out_kfree_skb;
1230
1231 if (msg->msg_flags & MSG_OOB)
1232 skb_queue_tail(&x25->interrupt_out_queue, skb);
1233 else {
1234 rc = x25_output(sk, skb);
1235 len = rc;
1236 if (rc < 0)
1237 kfree_skb(skb);
1238 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1239 len++;
1240 }
1241
1242 x25_kick(sk);
1243 rc = len;
1244 out:
1245 release_sock(sk);
1246 return rc;
1247 out_kfree_skb:
1248 kfree_skb(skb);
1249 goto out;
1250 }
1251
1252
1253 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1254 struct msghdr *msg, size_t size,
1255 int flags)
1256 {
1257 struct sock *sk = sock->sk;
1258 struct x25_sock *x25 = x25_sk(sk);
1259 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1260 size_t copied;
1261 int qbit, header_len;
1262 struct sk_buff *skb;
1263 unsigned char *asmptr;
1264 int rc = -ENOTCONN;
1265
1266 lock_sock(sk);
1267
1268 if (x25->neighbour == NULL)
1269 goto out;
1270
1271 header_len = x25->neighbour->extended ?
1272 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1273
1274 /*
1275 * This works for seqpacket too. The receiver has ordered the queue for
1276 * us! We do one quick check first though
1277 */
1278 if (sk->sk_state != TCP_ESTABLISHED)
1279 goto out;
1280
1281 if (flags & MSG_OOB) {
1282 rc = -EINVAL;
1283 if (sock_flag(sk, SOCK_URGINLINE) ||
1284 !skb_peek(&x25->interrupt_in_queue))
1285 goto out;
1286
1287 skb = skb_dequeue(&x25->interrupt_in_queue);
1288
1289 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1290 goto out_free_dgram;
1291
1292 skb_pull(skb, X25_STD_MIN_LEN);
1293
1294 /*
1295 * No Q bit information on Interrupt data.
1296 */
1297 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1298 asmptr = skb_push(skb, 1);
1299 *asmptr = 0x00;
1300 }
1301
1302 msg->msg_flags |= MSG_OOB;
1303 } else {
1304 /* Now we can treat all alike */
1305 release_sock(sk);
1306 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1307 flags & MSG_DONTWAIT, &rc);
1308 lock_sock(sk);
1309 if (!skb)
1310 goto out;
1311
1312 if (!pskb_may_pull(skb, header_len))
1313 goto out_free_dgram;
1314
1315 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1316
1317 skb_pull(skb, header_len);
1318
1319 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1320 asmptr = skb_push(skb, 1);
1321 *asmptr = qbit;
1322 }
1323 }
1324
1325 skb_reset_transport_header(skb);
1326 copied = skb->len;
1327
1328 if (copied > size) {
1329 copied = size;
1330 msg->msg_flags |= MSG_TRUNC;
1331 }
1332
1333 /* Currently, each datagram always contains a complete record */
1334 msg->msg_flags |= MSG_EOR;
1335
1336 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1337 if (rc)
1338 goto out_free_dgram;
1339
1340 if (sx25) {
1341 sx25->sx25_family = AF_X25;
1342 sx25->sx25_addr = x25->dest_addr;
1343 }
1344
1345 msg->msg_namelen = sizeof(struct sockaddr_x25);
1346
1347 x25_check_rbuf(sk);
1348 rc = copied;
1349 out_free_dgram:
1350 skb_free_datagram(sk, skb);
1351 out:
1352 release_sock(sk);
1353 return rc;
1354 }
1355
1356
1357 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1358 {
1359 struct sock *sk = sock->sk;
1360 struct x25_sock *x25 = x25_sk(sk);
1361 void __user *argp = (void __user *)arg;
1362 int rc;
1363
1364 switch (cmd) {
1365 case TIOCOUTQ: {
1366 int amount;
1367
1368 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1369 if (amount < 0)
1370 amount = 0;
1371 rc = put_user(amount, (unsigned int __user *)argp);
1372 break;
1373 }
1374
1375 case TIOCINQ: {
1376 struct sk_buff *skb;
1377 int amount = 0;
1378 /*
1379 * These two are safe on a single CPU system as
1380 * only user tasks fiddle here
1381 */
1382 lock_sock(sk);
1383 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1384 amount = skb->len;
1385 release_sock(sk);
1386 rc = put_user(amount, (unsigned int __user *)argp);
1387 break;
1388 }
1389
1390 case SIOCGSTAMP:
1391 rc = -EINVAL;
1392 if (sk)
1393 rc = sock_get_timestamp(sk,
1394 (struct timeval __user *)argp);
1395 break;
1396 case SIOCGSTAMPNS:
1397 rc = -EINVAL;
1398 if (sk)
1399 rc = sock_get_timestampns(sk,
1400 (struct timespec __user *)argp);
1401 break;
1402 case SIOCGIFADDR:
1403 case SIOCSIFADDR:
1404 case SIOCGIFDSTADDR:
1405 case SIOCSIFDSTADDR:
1406 case SIOCGIFBRDADDR:
1407 case SIOCSIFBRDADDR:
1408 case SIOCGIFNETMASK:
1409 case SIOCSIFNETMASK:
1410 case SIOCGIFMETRIC:
1411 case SIOCSIFMETRIC:
1412 rc = -EINVAL;
1413 break;
1414 case SIOCADDRT:
1415 case SIOCDELRT:
1416 rc = -EPERM;
1417 if (!capable(CAP_NET_ADMIN))
1418 break;
1419 rc = x25_route_ioctl(cmd, argp);
1420 break;
1421 case SIOCX25GSUBSCRIP:
1422 rc = x25_subscr_ioctl(cmd, argp);
1423 break;
1424 case SIOCX25SSUBSCRIP:
1425 rc = -EPERM;
1426 if (!capable(CAP_NET_ADMIN))
1427 break;
1428 rc = x25_subscr_ioctl(cmd, argp);
1429 break;
1430 case SIOCX25GFACILITIES: {
1431 lock_sock(sk);
1432 rc = copy_to_user(argp, &x25->facilities,
1433 sizeof(x25->facilities))
1434 ? -EFAULT : 0;
1435 release_sock(sk);
1436 break;
1437 }
1438
1439 case SIOCX25SFACILITIES: {
1440 struct x25_facilities facilities;
1441 rc = -EFAULT;
1442 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1443 break;
1444 rc = -EINVAL;
1445 lock_sock(sk);
1446 if (sk->sk_state != TCP_LISTEN &&
1447 sk->sk_state != TCP_CLOSE)
1448 goto out_fac_release;
1449 if (facilities.pacsize_in < X25_PS16 ||
1450 facilities.pacsize_in > X25_PS4096)
1451 goto out_fac_release;
1452 if (facilities.pacsize_out < X25_PS16 ||
1453 facilities.pacsize_out > X25_PS4096)
1454 goto out_fac_release;
1455 if (facilities.winsize_in < 1 ||
1456 facilities.winsize_in > 127)
1457 goto out_fac_release;
1458 if (facilities.throughput) {
1459 int out = facilities.throughput & 0xf0;
1460 int in = facilities.throughput & 0x0f;
1461 if (!out)
1462 facilities.throughput |=
1463 X25_DEFAULT_THROUGHPUT << 4;
1464 else if (out < 0x30 || out > 0xD0)
1465 goto out_fac_release;
1466 if (!in)
1467 facilities.throughput |=
1468 X25_DEFAULT_THROUGHPUT;
1469 else if (in < 0x03 || in > 0x0D)
1470 goto out_fac_release;
1471 }
1472 if (facilities.reverse &&
1473 (facilities.reverse & 0x81) != 0x81)
1474 goto out_fac_release;
1475 x25->facilities = facilities;
1476 rc = 0;
1477 out_fac_release:
1478 release_sock(sk);
1479 break;
1480 }
1481
1482 case SIOCX25GDTEFACILITIES: {
1483 lock_sock(sk);
1484 rc = copy_to_user(argp, &x25->dte_facilities,
1485 sizeof(x25->dte_facilities));
1486 release_sock(sk);
1487 if (rc)
1488 rc = -EFAULT;
1489 break;
1490 }
1491
1492 case SIOCX25SDTEFACILITIES: {
1493 struct x25_dte_facilities dtefacs;
1494 rc = -EFAULT;
1495 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1496 break;
1497 rc = -EINVAL;
1498 lock_sock(sk);
1499 if (sk->sk_state != TCP_LISTEN &&
1500 sk->sk_state != TCP_CLOSE)
1501 goto out_dtefac_release;
1502 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1503 goto out_dtefac_release;
1504 if (dtefacs.calling_ae == NULL)
1505 goto out_dtefac_release;
1506 if (dtefacs.called_len > X25_MAX_AE_LEN)
1507 goto out_dtefac_release;
1508 if (dtefacs.called_ae == NULL)
1509 goto out_dtefac_release;
1510 x25->dte_facilities = dtefacs;
1511 rc = 0;
1512 out_dtefac_release:
1513 release_sock(sk);
1514 break;
1515 }
1516
1517 case SIOCX25GCALLUSERDATA: {
1518 lock_sock(sk);
1519 rc = copy_to_user(argp, &x25->calluserdata,
1520 sizeof(x25->calluserdata))
1521 ? -EFAULT : 0;
1522 release_sock(sk);
1523 break;
1524 }
1525
1526 case SIOCX25SCALLUSERDATA: {
1527 struct x25_calluserdata calluserdata;
1528
1529 rc = -EFAULT;
1530 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1531 break;
1532 rc = -EINVAL;
1533 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1534 break;
1535 lock_sock(sk);
1536 x25->calluserdata = calluserdata;
1537 release_sock(sk);
1538 rc = 0;
1539 break;
1540 }
1541
1542 case SIOCX25GCAUSEDIAG: {
1543 lock_sock(sk);
1544 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1545 ? -EFAULT : 0;
1546 release_sock(sk);
1547 break;
1548 }
1549
1550 case SIOCX25SCAUSEDIAG: {
1551 struct x25_causediag causediag;
1552 rc = -EFAULT;
1553 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1554 break;
1555 lock_sock(sk);
1556 x25->causediag = causediag;
1557 release_sock(sk);
1558 rc = 0;
1559 break;
1560
1561 }
1562
1563 case SIOCX25SCUDMATCHLEN: {
1564 struct x25_subaddr sub_addr;
1565 rc = -EINVAL;
1566 lock_sock(sk);
1567 if(sk->sk_state != TCP_CLOSE)
1568 goto out_cud_release;
1569 rc = -EFAULT;
1570 if (copy_from_user(&sub_addr, argp,
1571 sizeof(sub_addr)))
1572 goto out_cud_release;
1573 rc = -EINVAL;
1574 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1575 goto out_cud_release;
1576 x25->cudmatchlength = sub_addr.cudmatchlength;
1577 rc = 0;
1578 out_cud_release:
1579 release_sock(sk);
1580 break;
1581 }
1582
1583 case SIOCX25CALLACCPTAPPRV: {
1584 rc = -EINVAL;
1585 lock_sock(sk);
1586 if (sk->sk_state != TCP_CLOSE)
1587 break;
1588 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1589 release_sock(sk);
1590 rc = 0;
1591 break;
1592 }
1593
1594 case SIOCX25SENDCALLACCPT: {
1595 rc = -EINVAL;
1596 lock_sock(sk);
1597 if (sk->sk_state != TCP_ESTABLISHED)
1598 break;
1599 /* must call accptapprv above */
1600 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1601 break;
1602 x25_write_internal(sk, X25_CALL_ACCEPTED);
1603 x25->state = X25_STATE_3;
1604 release_sock(sk);
1605 rc = 0;
1606 break;
1607 }
1608
1609 default:
1610 rc = -ENOIOCTLCMD;
1611 break;
1612 }
1613
1614 return rc;
1615 }
1616
1617 static const struct net_proto_family x25_family_ops = {
1618 .family = AF_X25,
1619 .create = x25_create,
1620 .owner = THIS_MODULE,
1621 };
1622
1623 #ifdef CONFIG_COMPAT
1624 static int compat_x25_subscr_ioctl(unsigned int cmd,
1625 struct compat_x25_subscrip_struct __user *x25_subscr32)
1626 {
1627 struct compat_x25_subscrip_struct x25_subscr;
1628 struct x25_neigh *nb;
1629 struct net_device *dev;
1630 int rc = -EINVAL;
1631
1632 rc = -EFAULT;
1633 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1634 goto out;
1635
1636 rc = -EINVAL;
1637 dev = x25_dev_get(x25_subscr.device);
1638 if (dev == NULL)
1639 goto out;
1640
1641 nb = x25_get_neigh(dev);
1642 if (nb == NULL)
1643 goto out_dev_put;
1644
1645 dev_put(dev);
1646
1647 if (cmd == SIOCX25GSUBSCRIP) {
1648 read_lock_bh(&x25_neigh_list_lock);
1649 x25_subscr.extended = nb->extended;
1650 x25_subscr.global_facil_mask = nb->global_facil_mask;
1651 read_unlock_bh(&x25_neigh_list_lock);
1652 rc = copy_to_user(x25_subscr32, &x25_subscr,
1653 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1654 } else {
1655 rc = -EINVAL;
1656 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1657 rc = 0;
1658 write_lock_bh(&x25_neigh_list_lock);
1659 nb->extended = x25_subscr.extended;
1660 nb->global_facil_mask = x25_subscr.global_facil_mask;
1661 write_unlock_bh(&x25_neigh_list_lock);
1662 }
1663 }
1664 x25_neigh_put(nb);
1665 out:
1666 return rc;
1667 out_dev_put:
1668 dev_put(dev);
1669 goto out;
1670 }
1671
1672 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1673 unsigned long arg)
1674 {
1675 void __user *argp = compat_ptr(arg);
1676 struct sock *sk = sock->sk;
1677
1678 int rc = -ENOIOCTLCMD;
1679
1680 switch(cmd) {
1681 case TIOCOUTQ:
1682 case TIOCINQ:
1683 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1684 break;
1685 case SIOCGSTAMP:
1686 rc = -EINVAL;
1687 if (sk)
1688 rc = compat_sock_get_timestamp(sk,
1689 (struct timeval __user*)argp);
1690 break;
1691 case SIOCGSTAMPNS:
1692 rc = -EINVAL;
1693 if (sk)
1694 rc = compat_sock_get_timestampns(sk,
1695 (struct timespec __user*)argp);
1696 break;
1697 case SIOCGIFADDR:
1698 case SIOCSIFADDR:
1699 case SIOCGIFDSTADDR:
1700 case SIOCSIFDSTADDR:
1701 case SIOCGIFBRDADDR:
1702 case SIOCSIFBRDADDR:
1703 case SIOCGIFNETMASK:
1704 case SIOCSIFNETMASK:
1705 case SIOCGIFMETRIC:
1706 case SIOCSIFMETRIC:
1707 rc = -EINVAL;
1708 break;
1709 case SIOCADDRT:
1710 case SIOCDELRT:
1711 rc = -EPERM;
1712 if (!capable(CAP_NET_ADMIN))
1713 break;
1714 rc = x25_route_ioctl(cmd, argp);
1715 break;
1716 case SIOCX25GSUBSCRIP:
1717 rc = compat_x25_subscr_ioctl(cmd, argp);
1718 break;
1719 case SIOCX25SSUBSCRIP:
1720 rc = -EPERM;
1721 if (!capable(CAP_NET_ADMIN))
1722 break;
1723 rc = compat_x25_subscr_ioctl(cmd, argp);
1724 break;
1725 case SIOCX25GFACILITIES:
1726 case SIOCX25SFACILITIES:
1727 case SIOCX25GDTEFACILITIES:
1728 case SIOCX25SDTEFACILITIES:
1729 case SIOCX25GCALLUSERDATA:
1730 case SIOCX25SCALLUSERDATA:
1731 case SIOCX25GCAUSEDIAG:
1732 case SIOCX25SCAUSEDIAG:
1733 case SIOCX25SCUDMATCHLEN:
1734 case SIOCX25CALLACCPTAPPRV:
1735 case SIOCX25SENDCALLACCPT:
1736 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1737 break;
1738 default:
1739 rc = -ENOIOCTLCMD;
1740 break;
1741 }
1742 return rc;
1743 }
1744 #endif
1745
1746 static const struct proto_ops x25_proto_ops = {
1747 .family = AF_X25,
1748 .owner = THIS_MODULE,
1749 .release = x25_release,
1750 .bind = x25_bind,
1751 .connect = x25_connect,
1752 .socketpair = sock_no_socketpair,
1753 .accept = x25_accept,
1754 .getname = x25_getname,
1755 .poll = datagram_poll,
1756 .ioctl = x25_ioctl,
1757 #ifdef CONFIG_COMPAT
1758 .compat_ioctl = compat_x25_ioctl,
1759 #endif
1760 .listen = x25_listen,
1761 .shutdown = sock_no_shutdown,
1762 .setsockopt = x25_setsockopt,
1763 .getsockopt = x25_getsockopt,
1764 .sendmsg = x25_sendmsg,
1765 .recvmsg = x25_recvmsg,
1766 .mmap = sock_no_mmap,
1767 .sendpage = sock_no_sendpage,
1768 };
1769
1770 static struct packet_type x25_packet_type __read_mostly = {
1771 .type = cpu_to_be16(ETH_P_X25),
1772 .func = x25_lapb_receive_frame,
1773 };
1774
1775 static struct notifier_block x25_dev_notifier = {
1776 .notifier_call = x25_device_event,
1777 };
1778
1779 void x25_kill_by_neigh(struct x25_neigh *nb)
1780 {
1781 struct sock *s;
1782
1783 write_lock_bh(&x25_list_lock);
1784
1785 sk_for_each(s, &x25_list)
1786 if (x25_sk(s)->neighbour == nb)
1787 x25_disconnect(s, ENETUNREACH, 0, 0);
1788
1789 write_unlock_bh(&x25_list_lock);
1790
1791 /* Remove any related forwards */
1792 x25_clear_forward_by_dev(nb->dev);
1793 }
1794
1795 static int __init x25_init(void)
1796 {
1797 int rc = proto_register(&x25_proto, 0);
1798
1799 if (rc != 0)
1800 goto out;
1801
1802 rc = sock_register(&x25_family_ops);
1803 if (rc != 0)
1804 goto out_proto;
1805
1806 dev_add_pack(&x25_packet_type);
1807
1808 rc = register_netdevice_notifier(&x25_dev_notifier);
1809 if (rc != 0)
1810 goto out_sock;
1811
1812 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1813
1814 x25_register_sysctl();
1815 rc = x25_proc_init();
1816 if (rc != 0)
1817 goto out_dev;
1818 out:
1819 return rc;
1820 out_dev:
1821 unregister_netdevice_notifier(&x25_dev_notifier);
1822 out_sock:
1823 sock_unregister(AF_X25);
1824 out_proto:
1825 proto_unregister(&x25_proto);
1826 goto out;
1827 }
1828 module_init(x25_init);
1829
1830 static void __exit x25_exit(void)
1831 {
1832 x25_proc_exit();
1833 x25_link_free();
1834 x25_route_free();
1835
1836 x25_unregister_sysctl();
1837
1838 unregister_netdevice_notifier(&x25_dev_notifier);
1839
1840 dev_remove_pack(&x25_packet_type);
1841
1842 sock_unregister(AF_X25);
1843 proto_unregister(&x25_proto);
1844 }
1845 module_exit(x25_exit);
1846
1847 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1848 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1849 MODULE_LICENSE("GPL");
1850 MODULE_ALIAS_NETPROTO(PF_X25);
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