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ALSA: isight: fix hang when unplugging a running device
[firewire-audio.git] / net / x25 / af_x25.c
blobad96ee90fe2760d324876a7ec582ed82d71b25d2
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/smp_lock.h>
44 #include <linux/timer.h>
45 #include <linux/string.h>
46 #include <linux/net.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_arp.h>
49 #include <linux/skbuff.h>
50 #include <linux/slab.h>
51 #include <net/sock.h>
52 #include <net/tcp_states.h>
53 #include <asm/uaccess.h>
54 #include <linux/fcntl.h>
55 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
56 #include <linux/notifier.h>
57 #include <linux/init.h>
58 #include <linux/compat.h>
59 #include <linux/ctype.h>
60
61 #include <net/x25.h>
62 #include <net/compat.h>
63
64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
65 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
66 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
67 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
68 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
69 int sysctl_x25_forward = 0;
70
71 HLIST_HEAD(x25_list);
72 DEFINE_RWLOCK(x25_list_lock);
73
74 static const struct proto_ops x25_proto_ops;
75
76 static struct x25_address null_x25_address = {" "};
77
78 #ifdef CONFIG_COMPAT
79 struct compat_x25_subscrip_struct {
80 char device[200-sizeof(compat_ulong_t)];
81 compat_ulong_t global_facil_mask;
82 compat_uint_t extended;
83 };
84 #endif
85
86
87 int x25_parse_address_block(struct sk_buff *skb,
88 struct x25_address *called_addr,
89 struct x25_address *calling_addr)
90 {
91 unsigned char len;
92 int needed;
93 int rc;
94
95 if (skb->len < 1) {
96 /* packet has no address block */
97 rc = 0;
98 goto empty;
99 }
100
101 len = *skb->data;
102 needed = 1 + (len >> 4) + (len & 0x0f);
103
104 if (skb->len < needed) {
105 /* packet is too short to hold the addresses it claims
106 to hold */
107 rc = -1;
108 goto empty;
109 }
110
111 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
112
113 empty:
114 *called_addr->x25_addr = 0;
115 *calling_addr->x25_addr = 0;
116
117 return rc;
118 }
119
120
121 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
122 struct x25_address *calling_addr)
123 {
124 unsigned int called_len, calling_len;
125 char *called, *calling;
126 unsigned int i;
127
128 called_len = (*p >> 0) & 0x0F;
129 calling_len = (*p >> 4) & 0x0F;
130
131 called = called_addr->x25_addr;
132 calling = calling_addr->x25_addr;
133 p++;
134
135 for (i = 0; i < (called_len + calling_len); i++) {
136 if (i < called_len) {
137 if (i % 2 != 0) {
138 *called++ = ((*p >> 0) & 0x0F) + '0';
139 p++;
140 } else {
141 *called++ = ((*p >> 4) & 0x0F) + '0';
142 }
143 } else {
144 if (i % 2 != 0) {
145 *calling++ = ((*p >> 0) & 0x0F) + '0';
146 p++;
147 } else {
148 *calling++ = ((*p >> 4) & 0x0F) + '0';
149 }
150 }
151 }
152
153 *called = *calling = '\0';
154
155 return 1 + (called_len + calling_len + 1) / 2;
156 }
157
158 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
159 struct x25_address *calling_addr)
160 {
161 unsigned int called_len, calling_len;
162 char *called, *calling;
163 int i;
164
165 called = called_addr->x25_addr;
166 calling = calling_addr->x25_addr;
167
168 called_len = strlen(called);
169 calling_len = strlen(calling);
170
171 *p++ = (calling_len << 4) | (called_len << 0);
172
173 for (i = 0; i < (called_len + calling_len); i++) {
174 if (i < called_len) {
175 if (i % 2 != 0) {
176 *p |= (*called++ - '0') << 0;
177 p++;
178 } else {
179 *p = 0x00;
180 *p |= (*called++ - '0') << 4;
181 }
182 } else {
183 if (i % 2 != 0) {
184 *p |= (*calling++ - '0') << 0;
185 p++;
186 } else {
187 *p = 0x00;
188 *p |= (*calling++ - '0') << 4;
189 }
190 }
191 }
192
193 return 1 + (called_len + calling_len + 1) / 2;
194 }
195
196 /*
197 * Socket removal during an interrupt is now safe.
198 */
199 static void x25_remove_socket(struct sock *sk)
200 {
201 write_lock_bh(&x25_list_lock);
202 sk_del_node_init(sk);
203 write_unlock_bh(&x25_list_lock);
204 }
205
206 /*
207 * Kill all bound sockets on a dropped device.
208 */
209 static void x25_kill_by_device(struct net_device *dev)
210 {
211 struct sock *s;
212 struct hlist_node *node;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, node, &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 = 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 defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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 struct hlist_node *node;
285
286 read_lock_bh(&x25_list_lock);
287 next_best = NULL;
288
289 sk_for_each(s, node, &x25_list)
290 if ((!strcmp(addr->x25_addr,
291 x25_sk(s)->source_addr.x25_addr) ||
292 !strcmp(addr->x25_addr,
293 null_x25_address.x25_addr)) &&
294 s->sk_state == TCP_LISTEN) {
295 /*
296 * Found a listening socket, now check the incoming
297 * call user data vs this sockets call user data
298 */
299 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
307 next_best = s;
308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315 found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318 }
319
320 /*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326 struct hlist_node *node;
327
328 sk_for_each(s, node, &x25_list)
329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330 sock_hold(s);
331 goto found;
332 }
333 s = NULL;
334 found:
335 return s;
336 }
337
338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339 {
340 struct sock *s;
341
342 read_lock_bh(&x25_list_lock);
343 s = __x25_find_socket(lci, nb);
344 read_unlock_bh(&x25_list_lock);
345 return s;
346 }
347
348 /*
349 * Find a unique LCI for a given device.
350 */
351 static unsigned int x25_new_lci(struct x25_neigh *nb)
352 {
353 unsigned int lci = 1;
354 struct sock *sk;
355
356 read_lock_bh(&x25_list_lock);
357
358 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359 sock_put(sk);
360 if (++lci == 4096) {
361 lci = 0;
362 break;
363 }
364 }
365
366 read_unlock_bh(&x25_list_lock);
367 return lci;
368 }
369
370 /*
371 * Deferred destroy.
372 */
373 static void __x25_destroy_socket(struct sock *);
374
375 /*
376 * handler for deferred kills.
377 */
378 static void x25_destroy_timer(unsigned long data)
379 {
380 x25_destroy_socket_from_timer((struct sock *)data);
381 }
382
383 /*
384 * This is called from user mode and the timers. Thus it protects itself
385 * against interrupt users but doesn't worry about being called during
386 * work. Once it is removed from the queue no interrupt or bottom half
387 * will touch it and we are (fairly 8-) ) safe.
388 * Not static as it's used by the timer
389 */
390 static void __x25_destroy_socket(struct sock *sk)
391 {
392 struct sk_buff *skb;
393
394 x25_stop_heartbeat(sk);
395 x25_stop_timer(sk);
396
397 x25_remove_socket(sk);
398 x25_clear_queues(sk); /* Flush the queues */
399
400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401 if (skb->sk != sk) { /* A pending connection */
402 /*
403 * Queue the unaccepted socket for death
404 */
405 skb->sk->sk_state = TCP_LISTEN;
406 sock_set_flag(skb->sk, SOCK_DEAD);
407 x25_start_heartbeat(skb->sk);
408 x25_sk(skb->sk)->state = X25_STATE_0;
409 }
410
411 kfree_skb(skb);
412 }
413
414 if (sk_has_allocations(sk)) {
415 /* Defer: outstanding buffers */
416 sk->sk_timer.expires = jiffies + 10 * HZ;
417 sk->sk_timer.function = x25_destroy_timer;
418 sk->sk_timer.data = (unsigned long)sk;
419 add_timer(&sk->sk_timer);
420 } else {
421 /* drop last reference so sock_put will free */
422 __sock_put(sk);
423 }
424 }
425
426 void x25_destroy_socket_from_timer(struct sock *sk)
427 {
428 sock_hold(sk);
429 bh_lock_sock(sk);
430 __x25_destroy_socket(sk);
431 bh_unlock_sock(sk);
432 sock_put(sk);
433 }
434
435 static void x25_destroy_socket(struct sock *sk)
436 {
437 sock_hold(sk);
438 lock_sock(sk);
439 __x25_destroy_socket(sk);
440 release_sock(sk);
441 sock_put(sk);
442 }
443
444 /*
445 * Handling for system calls applied via the various interfaces to a
446 * X.25 socket object.
447 */
448
449 static int x25_setsockopt(struct socket *sock, int level, int optname,
450 char __user *optval, unsigned int optlen)
451 {
452 int opt;
453 struct sock *sk = sock->sk;
454 int rc = -ENOPROTOOPT;
455
456 if (level != SOL_X25 || optname != X25_QBITINCL)
457 goto out;
458
459 rc = -EINVAL;
460 if (optlen < sizeof(int))
461 goto out;
462
463 rc = -EFAULT;
464 if (get_user(opt, (int __user *)optval))
465 goto out;
466
467 if (opt)
468 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
469 else
470 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
471 rc = 0;
472 out:
473 return rc;
474 }
475
476 static int x25_getsockopt(struct socket *sock, int level, int optname,
477 char __user *optval, int __user *optlen)
478 {
479 struct sock *sk = sock->sk;
480 int val, len, rc = -ENOPROTOOPT;
481
482 if (level != SOL_X25 || optname != X25_QBITINCL)
483 goto out;
484
485 rc = -EFAULT;
486 if (get_user(len, optlen))
487 goto out;
488
489 len = min_t(unsigned int, len, sizeof(int));
490
491 rc = -EINVAL;
492 if (len < 0)
493 goto out;
494
495 rc = -EFAULT;
496 if (put_user(len, optlen))
497 goto out;
498
499 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
500 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
501 out:
502 return rc;
503 }
504
505 static int x25_listen(struct socket *sock, int backlog)
506 {
507 struct sock *sk = sock->sk;
508 int rc = -EOPNOTSUPP;
509
510 lock_sock(sk);
511 if (sk->sk_state != TCP_LISTEN) {
512 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
513 sk->sk_max_ack_backlog = backlog;
514 sk->sk_state = TCP_LISTEN;
515 rc = 0;
516 }
517 release_sock(sk);
518
519 return rc;
520 }
521
522 static struct proto x25_proto = {
523 .name = "X25",
524 .owner = THIS_MODULE,
525 .obj_size = sizeof(struct x25_sock),
526 };
527
528 static struct sock *x25_alloc_socket(struct net *net)
529 {
530 struct x25_sock *x25;
531 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
532
533 if (!sk)
534 goto out;
535
536 sock_init_data(NULL, sk);
537
538 x25 = x25_sk(sk);
539 skb_queue_head_init(&x25->ack_queue);
540 skb_queue_head_init(&x25->fragment_queue);
541 skb_queue_head_init(&x25->interrupt_in_queue);
542 skb_queue_head_init(&x25->interrupt_out_queue);
543 out:
544 return sk;
545 }
546
547 static int x25_create(struct net *net, struct socket *sock, int protocol,
548 int kern)
549 {
550 struct sock *sk;
551 struct x25_sock *x25;
552 int rc = -EAFNOSUPPORT;
553
554 if (!net_eq(net, &init_net))
555 goto out;
556
557 rc = -ESOCKTNOSUPPORT;
558 if (sock->type != SOCK_SEQPACKET)
559 goto out;
560
561 rc = -EINVAL;
562 if (protocol)
563 goto out;
564
565 rc = -ENOBUFS;
566 if ((sk = x25_alloc_socket(net)) == NULL)
567 goto out;
568
569 x25 = x25_sk(sk);
570
571 sock_init_data(sock, sk);
572
573 x25_init_timers(sk);
574
575 sock->ops = &x25_proto_ops;
576 sk->sk_protocol = protocol;
577 sk->sk_backlog_rcv = x25_backlog_rcv;
578
579 x25->t21 = sysctl_x25_call_request_timeout;
580 x25->t22 = sysctl_x25_reset_request_timeout;
581 x25->t23 = sysctl_x25_clear_request_timeout;
582 x25->t2 = sysctl_x25_ack_holdback_timeout;
583 x25->state = X25_STATE_0;
584 x25->cudmatchlength = 0;
585 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
586 /* on call accept */
587
588 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
589 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
590 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
591 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
592 x25->facilities.throughput = 0; /* by default don't negotiate
593 throughput */
594 x25->facilities.reverse = X25_DEFAULT_REVERSE;
595 x25->dte_facilities.calling_len = 0;
596 x25->dte_facilities.called_len = 0;
597 memset(x25->dte_facilities.called_ae, '\0',
598 sizeof(x25->dte_facilities.called_ae));
599 memset(x25->dte_facilities.calling_ae, '\0',
600 sizeof(x25->dte_facilities.calling_ae));
601
602 rc = 0;
603 out:
604 return rc;
605 }
606
607 static struct sock *x25_make_new(struct sock *osk)
608 {
609 struct sock *sk = NULL;
610 struct x25_sock *x25, *ox25;
611
612 if (osk->sk_type != SOCK_SEQPACKET)
613 goto out;
614
615 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
616 goto out;
617
618 x25 = x25_sk(sk);
619
620 sk->sk_type = osk->sk_type;
621 sk->sk_priority = osk->sk_priority;
622 sk->sk_protocol = osk->sk_protocol;
623 sk->sk_rcvbuf = osk->sk_rcvbuf;
624 sk->sk_sndbuf = osk->sk_sndbuf;
625 sk->sk_state = TCP_ESTABLISHED;
626 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
627 sock_copy_flags(sk, osk);
628
629 ox25 = x25_sk(osk);
630 x25->t21 = ox25->t21;
631 x25->t22 = ox25->t22;
632 x25->t23 = ox25->t23;
633 x25->t2 = ox25->t2;
634 x25->flags = ox25->flags;
635 x25->facilities = ox25->facilities;
636 x25->dte_facilities = ox25->dte_facilities;
637 x25->cudmatchlength = ox25->cudmatchlength;
638
639 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
640 x25_init_timers(sk);
641 out:
642 return sk;
643 }
644
645 static int x25_release(struct socket *sock)
646 {
647 struct sock *sk = sock->sk;
648 struct x25_sock *x25;
649
650 lock_kernel();
651 if (!sk)
652 goto out;
653
654 x25 = x25_sk(sk);
655
656 switch (x25->state) {
657
658 case X25_STATE_0:
659 case X25_STATE_2:
660 x25_disconnect(sk, 0, 0, 0);
661 x25_destroy_socket(sk);
662 goto out;
663
664 case X25_STATE_1:
665 case X25_STATE_3:
666 case X25_STATE_4:
667 x25_clear_queues(sk);
668 x25_write_internal(sk, X25_CLEAR_REQUEST);
669 x25_start_t23timer(sk);
670 x25->state = X25_STATE_2;
671 sk->sk_state = TCP_CLOSE;
672 sk->sk_shutdown |= SEND_SHUTDOWN;
673 sk->sk_state_change(sk);
674 sock_set_flag(sk, SOCK_DEAD);
675 sock_set_flag(sk, SOCK_DESTROY);
676 break;
677 }
678
679 sock_orphan(sk);
680 out:
681 unlock_kernel();
682 return 0;
683 }
684
685 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
686 {
687 struct sock *sk = sock->sk;
688 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
689 int len, i, rc = 0;
690
691 if (!sock_flag(sk, SOCK_ZAPPED) ||
692 addr_len != sizeof(struct sockaddr_x25) ||
693 addr->sx25_family != AF_X25) {
694 rc = -EINVAL;
695 goto out;
696 }
697
698 len = strlen(addr->sx25_addr.x25_addr);
699 for (i = 0; i < len; i++) {
700 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
701 rc = -EINVAL;
702 goto out;
703 }
704 }
705
706 lock_sock(sk);
707 x25_sk(sk)->source_addr = addr->sx25_addr;
708 x25_insert_socket(sk);
709 sock_reset_flag(sk, SOCK_ZAPPED);
710 release_sock(sk);
711 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
712 out:
713 return rc;
714 }
715
716 static int x25_wait_for_connection_establishment(struct sock *sk)
717 {
718 DECLARE_WAITQUEUE(wait, current);
719 int rc;
720
721 add_wait_queue_exclusive(sk_sleep(sk), &wait);
722 for (;;) {
723 __set_current_state(TASK_INTERRUPTIBLE);
724 rc = -ERESTARTSYS;
725 if (signal_pending(current))
726 break;
727 rc = sock_error(sk);
728 if (rc) {
729 sk->sk_socket->state = SS_UNCONNECTED;
730 break;
731 }
732 rc = 0;
733 if (sk->sk_state != TCP_ESTABLISHED) {
734 release_sock(sk);
735 schedule();
736 lock_sock(sk);
737 } else
738 break;
739 }
740 __set_current_state(TASK_RUNNING);
741 remove_wait_queue(sk_sleep(sk), &wait);
742 return rc;
743 }
744
745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
746 int addr_len, int flags)
747 {
748 struct sock *sk = sock->sk;
749 struct x25_sock *x25 = x25_sk(sk);
750 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
751 struct x25_route *rt;
752 int rc = 0;
753
754 lock_sock(sk);
755 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
756 sock->state = SS_CONNECTED;
757 goto out; /* Connect completed during a ERESTARTSYS event */
758 }
759
760 rc = -ECONNREFUSED;
761 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
762 sock->state = SS_UNCONNECTED;
763 goto out;
764 }
765
766 rc = -EISCONN; /* No reconnect on a seqpacket socket */
767 if (sk->sk_state == TCP_ESTABLISHED)
768 goto out;
769
770 sk->sk_state = TCP_CLOSE;
771 sock->state = SS_UNCONNECTED;
772
773 rc = -EINVAL;
774 if (addr_len != sizeof(struct sockaddr_x25) ||
775 addr->sx25_family != AF_X25)
776 goto out;
777
778 rc = -ENETUNREACH;
779 rt = x25_get_route(&addr->sx25_addr);
780 if (!rt)
781 goto out;
782
783 x25->neighbour = x25_get_neigh(rt->dev);
784 if (!x25->neighbour)
785 goto out_put_route;
786
787 x25_limit_facilities(&x25->facilities, x25->neighbour);
788
789 x25->lci = x25_new_lci(x25->neighbour);
790 if (!x25->lci)
791 goto out_put_neigh;
792
793 rc = -EINVAL;
794 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
795 goto out_put_neigh;
796
797 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
798 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
799
800 x25->dest_addr = addr->sx25_addr;
801
802 /* Move to connecting socket, start sending Connect Requests */
803 sock->state = SS_CONNECTING;
804 sk->sk_state = TCP_SYN_SENT;
805
806 x25->state = X25_STATE_1;
807
808 x25_write_internal(sk, X25_CALL_REQUEST);
809
810 x25_start_heartbeat(sk);
811 x25_start_t21timer(sk);
812
813 /* Now the loop */
814 rc = -EINPROGRESS;
815 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
816 goto out_put_neigh;
817
818 rc = x25_wait_for_connection_establishment(sk);
819 if (rc)
820 goto out_put_neigh;
821
822 sock->state = SS_CONNECTED;
823 rc = 0;
824 out_put_neigh:
825 if (rc)
826 x25_neigh_put(x25->neighbour);
827 out_put_route:
828 x25_route_put(rt);
829 out:
830 release_sock(sk);
831 return rc;
832 }
833
834 static int x25_wait_for_data(struct sock *sk, long timeout)
835 {
836 DECLARE_WAITQUEUE(wait, current);
837 int rc = 0;
838
839 add_wait_queue_exclusive(sk_sleep(sk), &wait);
840 for (;;) {
841 __set_current_state(TASK_INTERRUPTIBLE);
842 if (sk->sk_shutdown & RCV_SHUTDOWN)
843 break;
844 rc = -ERESTARTSYS;
845 if (signal_pending(current))
846 break;
847 rc = -EAGAIN;
848 if (!timeout)
849 break;
850 rc = 0;
851 if (skb_queue_empty(&sk->sk_receive_queue)) {
852 release_sock(sk);
853 timeout = schedule_timeout(timeout);
854 lock_sock(sk);
855 } else
856 break;
857 }
858 __set_current_state(TASK_RUNNING);
859 remove_wait_queue(sk_sleep(sk), &wait);
860 return rc;
861 }
862
863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
864 {
865 struct sock *sk = sock->sk;
866 struct sock *newsk;
867 struct sk_buff *skb;
868 int rc = -EINVAL;
869
870 if (!sk)
871 goto out;
872
873 rc = -EOPNOTSUPP;
874 if (sk->sk_type != SOCK_SEQPACKET)
875 goto out;
876
877 lock_sock(sk);
878 rc = -EINVAL;
879 if (sk->sk_state != TCP_LISTEN)
880 goto out2;
881
882 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
883 if (rc)
884 goto out2;
885 skb = skb_dequeue(&sk->sk_receive_queue);
886 rc = -EINVAL;
887 if (!skb->sk)
888 goto out2;
889 newsk = skb->sk;
890 sock_graft(newsk, newsock);
891
892 /* Now attach up the new socket */
893 skb->sk = NULL;
894 kfree_skb(skb);
895 sk->sk_ack_backlog--;
896 newsock->state = SS_CONNECTED;
897 rc = 0;
898 out2:
899 release_sock(sk);
900 out:
901 return rc;
902 }
903
904 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
905 int *uaddr_len, int peer)
906 {
907 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
908 struct sock *sk = sock->sk;
909 struct x25_sock *x25 = x25_sk(sk);
910 int rc = 0;
911
912 if (peer) {
913 if (sk->sk_state != TCP_ESTABLISHED) {
914 rc = -ENOTCONN;
915 goto out;
916 }
917 sx25->sx25_addr = x25->dest_addr;
918 } else
919 sx25->sx25_addr = x25->source_addr;
920
921 sx25->sx25_family = AF_X25;
922 *uaddr_len = sizeof(*sx25);
923
924 out:
925 return rc;
926 }
927
928 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
929 unsigned int lci)
930 {
931 struct sock *sk;
932 struct sock *make;
933 struct x25_sock *makex25;
934 struct x25_address source_addr, dest_addr;
935 struct x25_facilities facilities;
936 struct x25_dte_facilities dte_facilities;
937 int len, addr_len, rc;
938
939 /*
940 * Remove the LCI and frame type.
941 */
942 skb_pull(skb, X25_STD_MIN_LEN);
943
944 /*
945 * Extract the X.25 addresses and convert them to ASCII strings,
946 * and remove them.
947 *
948 * Address block is mandatory in call request packets
949 */
950 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
951 if (addr_len <= 0)
952 goto out_clear_request;
953 skb_pull(skb, addr_len);
954
955 /*
956 * Get the length of the facilities, skip past them for the moment
957 * get the call user data because this is needed to determine
958 * the correct listener
959 *
960 * Facilities length is mandatory in call request packets
961 */
962 if (skb->len < 1)
963 goto out_clear_request;
964 len = skb->data[0] + 1;
965 if (skb->len < len)
966 goto out_clear_request;
967 skb_pull(skb,len);
968
969 /*
970 * Find a listener for the particular address/cud pair.
971 */
972 sk = x25_find_listener(&source_addr,skb);
973 skb_push(skb,len);
974
975 if (sk != NULL && sk_acceptq_is_full(sk)) {
976 goto out_sock_put;
977 }
978
979 /*
980 * We dont have any listeners for this incoming call.
981 * Try forwarding it.
982 */
983 if (sk == NULL) {
984 skb_push(skb, addr_len + X25_STD_MIN_LEN);
985 if (sysctl_x25_forward &&
986 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
987 {
988 /* Call was forwarded, dont process it any more */
989 kfree_skb(skb);
990 rc = 1;
991 goto out;
992 } else {
993 /* No listeners, can't forward, clear the call */
994 goto out_clear_request;
995 }
996 }
997
998 /*
999 * Try to reach a compromise on the requested facilities.
1000 */
1001 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1002 if (len == -1)
1003 goto out_sock_put;
1004
1005 /*
1006 * current neighbour/link might impose additional limits
1007 * on certain facilties
1008 */
1009
1010 x25_limit_facilities(&facilities, nb);
1011
1012 /*
1013 * Try to create a new socket.
1014 */
1015 make = x25_make_new(sk);
1016 if (!make)
1017 goto out_sock_put;
1018
1019 /*
1020 * Remove the facilities
1021 */
1022 skb_pull(skb, len);
1023
1024 skb->sk = make;
1025 make->sk_state = TCP_ESTABLISHED;
1026
1027 makex25 = x25_sk(make);
1028 makex25->lci = lci;
1029 makex25->dest_addr = dest_addr;
1030 makex25->source_addr = source_addr;
1031 makex25->neighbour = nb;
1032 makex25->facilities = facilities;
1033 makex25->dte_facilities= dte_facilities;
1034 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1035 /* ensure no reverse facil on accept */
1036 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1037 /* ensure no calling address extension on accept */
1038 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1039 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1040
1041 /* Normally all calls are accepted immediately */
1042 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1043 x25_write_internal(make, X25_CALL_ACCEPTED);
1044 makex25->state = X25_STATE_3;
1045 }
1046
1047 /*
1048 * Incoming Call User Data.
1049 */
1050 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1051 makex25->calluserdata.cudlength = skb->len;
1052
1053 sk->sk_ack_backlog++;
1054
1055 x25_insert_socket(make);
1056
1057 skb_queue_head(&sk->sk_receive_queue, skb);
1058
1059 x25_start_heartbeat(make);
1060
1061 if (!sock_flag(sk, SOCK_DEAD))
1062 sk->sk_data_ready(sk, skb->len);
1063 rc = 1;
1064 sock_put(sk);
1065 out:
1066 return rc;
1067 out_sock_put:
1068 sock_put(sk);
1069 out_clear_request:
1070 rc = 0;
1071 x25_transmit_clear_request(nb, lci, 0x01);
1072 goto out;
1073 }
1074
1075 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1076 struct msghdr *msg, size_t len)
1077 {
1078 struct sock *sk = sock->sk;
1079 struct x25_sock *x25 = x25_sk(sk);
1080 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1081 struct sockaddr_x25 sx25;
1082 struct sk_buff *skb;
1083 unsigned char *asmptr;
1084 int noblock = msg->msg_flags & MSG_DONTWAIT;
1085 size_t size;
1086 int qbit = 0, rc = -EINVAL;
1087
1088 lock_kernel();
1089 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1090 goto out;
1091
1092 /* we currently don't support segmented records at the user interface */
1093 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1094 goto out;
1095
1096 rc = -EADDRNOTAVAIL;
1097 if (sock_flag(sk, SOCK_ZAPPED))
1098 goto out;
1099
1100 rc = -EPIPE;
1101 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1102 send_sig(SIGPIPE, current, 0);
1103 goto out;
1104 }
1105
1106 rc = -ENETUNREACH;
1107 if (!x25->neighbour)
1108 goto out;
1109
1110 if (usx25) {
1111 rc = -EINVAL;
1112 if (msg->msg_namelen < sizeof(sx25))
1113 goto out;
1114 memcpy(&sx25, usx25, sizeof(sx25));
1115 rc = -EISCONN;
1116 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1117 goto out;
1118 rc = -EINVAL;
1119 if (sx25.sx25_family != AF_X25)
1120 goto out;
1121 } else {
1122 /*
1123 * FIXME 1003.1g - if the socket is like this because
1124 * it has become closed (not started closed) we ought
1125 * to SIGPIPE, EPIPE;
1126 */
1127 rc = -ENOTCONN;
1128 if (sk->sk_state != TCP_ESTABLISHED)
1129 goto out;
1130
1131 sx25.sx25_family = AF_X25;
1132 sx25.sx25_addr = x25->dest_addr;
1133 }
1134
1135 /* Sanity check the packet size */
1136 if (len > 65535) {
1137 rc = -EMSGSIZE;
1138 goto out;
1139 }
1140
1141 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1142
1143 /* Build a packet */
1144 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1145
1146 if ((msg->msg_flags & MSG_OOB) && len > 32)
1147 len = 32;
1148
1149 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1150
1151 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1152 if (!skb)
1153 goto out;
1154 X25_SKB_CB(skb)->flags = msg->msg_flags;
1155
1156 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1157
1158 /*
1159 * Put the data on the end
1160 */
1161 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1162
1163 skb_reset_transport_header(skb);
1164 skb_put(skb, len);
1165
1166 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1167 if (rc)
1168 goto out_kfree_skb;
1169
1170 /*
1171 * If the Q BIT Include socket option is in force, the first
1172 * byte of the user data is the logical value of the Q Bit.
1173 */
1174 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1175 qbit = skb->data[0];
1176 skb_pull(skb, 1);
1177 }
1178
1179 /*
1180 * Push down the X.25 header
1181 */
1182 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1183
1184 if (msg->msg_flags & MSG_OOB) {
1185 if (x25->neighbour->extended) {
1186 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1187 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1188 *asmptr++ = (x25->lci >> 0) & 0xFF;
1189 *asmptr++ = X25_INTERRUPT;
1190 } else {
1191 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1192 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1193 *asmptr++ = (x25->lci >> 0) & 0xFF;
1194 *asmptr++ = X25_INTERRUPT;
1195 }
1196 } else {
1197 if (x25->neighbour->extended) {
1198 /* Build an Extended X.25 header */
1199 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1200 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1201 *asmptr++ = (x25->lci >> 0) & 0xFF;
1202 *asmptr++ = X25_DATA;
1203 *asmptr++ = X25_DATA;
1204 } else {
1205 /* Build an Standard X.25 header */
1206 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1207 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1208 *asmptr++ = (x25->lci >> 0) & 0xFF;
1209 *asmptr++ = X25_DATA;
1210 }
1211
1212 if (qbit)
1213 skb->data[0] |= X25_Q_BIT;
1214 }
1215
1216 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1217 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1218
1219 rc = -ENOTCONN;
1220 if (sk->sk_state != TCP_ESTABLISHED)
1221 goto out_kfree_skb;
1222
1223 if (msg->msg_flags & MSG_OOB)
1224 skb_queue_tail(&x25->interrupt_out_queue, skb);
1225 else {
1226 rc = x25_output(sk, skb);
1227 len = rc;
1228 if (rc < 0)
1229 kfree_skb(skb);
1230 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1231 len++;
1232 }
1233
1234 /*
1235 * lock_sock() is currently only used to serialize this x25_kick()
1236 * against input-driven x25_kick() calls. It currently only blocks
1237 * incoming packets for this socket and does not protect against
1238 * any other socket state changes and is not called from anywhere
1239 * else. As x25_kick() cannot block and as long as all socket
1240 * operations are BKL-wrapped, we don't need take to care about
1241 * purging the backlog queue in x25_release().
1242 *
1243 * Using lock_sock() to protect all socket operations entirely
1244 * (and making the whole x25 stack SMP aware) unfortunately would
1245 * require major changes to {send,recv}msg and skb allocation methods.
1246 * -> 2.5 ;)
1247 */
1248 lock_sock(sk);
1249 x25_kick(sk);
1250 release_sock(sk);
1251 rc = len;
1252 out:
1253 unlock_kernel();
1254 return rc;
1255 out_kfree_skb:
1256 kfree_skb(skb);
1257 goto out;
1258 }
1259
1260
1261 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1262 struct msghdr *msg, size_t size,
1263 int flags)
1264 {
1265 struct sock *sk = sock->sk;
1266 struct x25_sock *x25 = x25_sk(sk);
1267 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1268 size_t copied;
1269 int qbit;
1270 struct sk_buff *skb;
1271 unsigned char *asmptr;
1272 int rc = -ENOTCONN;
1273
1274 lock_kernel();
1275 /*
1276 * This works for seqpacket too. The receiver has ordered the queue for
1277 * us! We do one quick check first though
1278 */
1279 if (sk->sk_state != TCP_ESTABLISHED)
1280 goto out;
1281
1282 if (flags & MSG_OOB) {
1283 rc = -EINVAL;
1284 if (sock_flag(sk, SOCK_URGINLINE) ||
1285 !skb_peek(&x25->interrupt_in_queue))
1286 goto out;
1287
1288 skb = skb_dequeue(&x25->interrupt_in_queue);
1289
1290 skb_pull(skb, X25_STD_MIN_LEN);
1291
1292 /*
1293 * No Q bit information on Interrupt data.
1294 */
1295 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1296 asmptr = skb_push(skb, 1);
1297 *asmptr = 0x00;
1298 }
1299
1300 msg->msg_flags |= MSG_OOB;
1301 } else {
1302 /* Now we can treat all alike */
1303 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1304 flags & MSG_DONTWAIT, &rc);
1305 if (!skb)
1306 goto out;
1307
1308 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1309
1310 skb_pull(skb, x25->neighbour->extended ?
1311 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1312
1313 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1314 asmptr = skb_push(skb, 1);
1315 *asmptr = qbit;
1316 }
1317 }
1318
1319 skb_reset_transport_header(skb);
1320 copied = skb->len;
1321
1322 if (copied > size) {
1323 copied = size;
1324 msg->msg_flags |= MSG_TRUNC;
1325 }
1326
1327 /* Currently, each datagram always contains a complete record */
1328 msg->msg_flags |= MSG_EOR;
1329
1330 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1331 if (rc)
1332 goto out_free_dgram;
1333
1334 if (sx25) {
1335 sx25->sx25_family = AF_X25;
1336 sx25->sx25_addr = x25->dest_addr;
1337 }
1338
1339 msg->msg_namelen = sizeof(struct sockaddr_x25);
1340
1341 lock_sock(sk);
1342 x25_check_rbuf(sk);
1343 release_sock(sk);
1344 rc = copied;
1345 out_free_dgram:
1346 skb_free_datagram(sk, skb);
1347 out:
1348 unlock_kernel();
1349 return rc;
1350 }
1351
1352
1353 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1354 {
1355 struct sock *sk = sock->sk;
1356 struct x25_sock *x25 = x25_sk(sk);
1357 void __user *argp = (void __user *)arg;
1358 int rc;
1359
1360 switch (cmd) {
1361 case TIOCOUTQ: {
1362 int amount;
1363
1364 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1365 if (amount < 0)
1366 amount = 0;
1367 rc = put_user(amount, (unsigned int __user *)argp);
1368 break;
1369 }
1370
1371 case TIOCINQ: {
1372 struct sk_buff *skb;
1373 int amount = 0;
1374 /*
1375 * These two are safe on a single CPU system as
1376 * only user tasks fiddle here
1377 */
1378 lock_sock(sk);
1379 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1380 amount = skb->len;
1381 release_sock(sk);
1382 rc = put_user(amount, (unsigned int __user *)argp);
1383 break;
1384 }
1385
1386 case SIOCGSTAMP:
1387 rc = -EINVAL;
1388 if (sk)
1389 rc = sock_get_timestamp(sk,
1390 (struct timeval __user *)argp);
1391 break;
1392 case SIOCGSTAMPNS:
1393 rc = -EINVAL;
1394 if (sk)
1395 rc = sock_get_timestampns(sk,
1396 (struct timespec __user *)argp);
1397 break;
1398 case SIOCGIFADDR:
1399 case SIOCSIFADDR:
1400 case SIOCGIFDSTADDR:
1401 case SIOCSIFDSTADDR:
1402 case SIOCGIFBRDADDR:
1403 case SIOCSIFBRDADDR:
1404 case SIOCGIFNETMASK:
1405 case SIOCSIFNETMASK:
1406 case SIOCGIFMETRIC:
1407 case SIOCSIFMETRIC:
1408 rc = -EINVAL;
1409 break;
1410 case SIOCADDRT:
1411 case SIOCDELRT:
1412 rc = -EPERM;
1413 if (!capable(CAP_NET_ADMIN))
1414 break;
1415 rc = x25_route_ioctl(cmd, argp);
1416 break;
1417 case SIOCX25GSUBSCRIP:
1418 rc = x25_subscr_ioctl(cmd, argp);
1419 break;
1420 case SIOCX25SSUBSCRIP:
1421 rc = -EPERM;
1422 if (!capable(CAP_NET_ADMIN))
1423 break;
1424 rc = x25_subscr_ioctl(cmd, argp);
1425 break;
1426 case SIOCX25GFACILITIES: {
1427 lock_sock(sk);
1428 rc = copy_to_user(argp, &x25->facilities,
1429 sizeof(x25->facilities))
1430 ? -EFAULT : 0;
1431 release_sock(sk);
1432 break;
1433 }
1434
1435 case SIOCX25SFACILITIES: {
1436 struct x25_facilities facilities;
1437 rc = -EFAULT;
1438 if (copy_from_user(&facilities, argp,
1439 sizeof(facilities)))
1440 break;
1441 rc = -EINVAL;
1442 lock_sock(sk);
1443 if (sk->sk_state != TCP_LISTEN &&
1444 sk->sk_state != TCP_CLOSE)
1445 goto out_fac_release;
1446 if (facilities.pacsize_in < X25_PS16 ||
1447 facilities.pacsize_in > X25_PS4096)
1448 goto out_fac_release;
1449 if (facilities.pacsize_out < X25_PS16 ||
1450 facilities.pacsize_out > X25_PS4096)
1451 goto out_fac_release;
1452 if (facilities.winsize_in < 1 ||
1453 facilities.winsize_in > 127)
1454 goto out_fac_release;
1455 if (facilities.throughput) {
1456 int out = facilities.throughput & 0xf0;
1457 int in = facilities.throughput & 0x0f;
1458 if (!out)
1459 facilities.throughput |=
1460 X25_DEFAULT_THROUGHPUT << 4;
1461 else if (out < 0x30 || out > 0xD0)
1462 goto out_fac_release;
1463 if (!in)
1464 facilities.throughput |=
1465 X25_DEFAULT_THROUGHPUT;
1466 else if (in < 0x03 || in > 0x0D)
1467 goto out_fac_release;
1468 }
1469 if (facilities.reverse &&
1470 (facilities.reverse & 0x81) != 0x81)
1471 goto out_fac_release;
1472 x25->facilities = facilities;
1473 rc = 0;
1474 out_fac_release:
1475 release_sock(sk);
1476 break;
1477 }
1478
1479 case SIOCX25GDTEFACILITIES: {
1480 lock_sock(sk);
1481 rc = copy_to_user(argp, &x25->dte_facilities,
1482 sizeof(x25->dte_facilities));
1483 release_sock(sk);
1484 if (rc)
1485 rc = -EFAULT;
1486 break;
1487 }
1488
1489 case SIOCX25SDTEFACILITIES: {
1490 struct x25_dte_facilities dtefacs;
1491 rc = -EFAULT;
1492 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1493 break;
1494 rc = -EINVAL;
1495 lock_sock(sk);
1496 if (sk->sk_state != TCP_LISTEN &&
1497 sk->sk_state != TCP_CLOSE)
1498 goto out_dtefac_release;
1499 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1500 goto out_dtefac_release;
1501 if (dtefacs.calling_ae == NULL)
1502 goto out_dtefac_release;
1503 if (dtefacs.called_len > X25_MAX_AE_LEN)
1504 goto out_dtefac_release;
1505 if (dtefacs.called_ae == NULL)
1506 goto out_dtefac_release;
1507 x25->dte_facilities = dtefacs;
1508 rc = 0;
1509 out_dtefac_release:
1510 release_sock(sk);
1511 break;
1512 }
1513
1514 case SIOCX25GCALLUSERDATA: {
1515 lock_sock(sk);
1516 rc = copy_to_user(argp, &x25->calluserdata,
1517 sizeof(x25->calluserdata))
1518 ? -EFAULT : 0;
1519 release_sock(sk);
1520 break;
1521 }
1522
1523 case SIOCX25SCALLUSERDATA: {
1524 struct x25_calluserdata calluserdata;
1525
1526 rc = -EFAULT;
1527 if (copy_from_user(&calluserdata, argp,
1528 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,
1543 sizeof(x25->causediag))
1544 ? -EFAULT : 0;
1545 release_sock(sk);
1546 break;
1547 }
1548
1549 case SIOCX25SCAUSEDIAG: {
1550 struct x25_causediag causediag;
1551 rc = -EFAULT;
1552 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1553 break;
1554 lock_sock(sk);
1555 x25->causediag = causediag;
1556 release_sock(sk);
1557 rc = 0;
1558 break;
1559
1560 }
1561
1562 case SIOCX25SCUDMATCHLEN: {
1563 struct x25_subaddr sub_addr;
1564 rc = -EINVAL;
1565 lock_sock(sk);
1566 if(sk->sk_state != TCP_CLOSE)
1567 goto out_cud_release;
1568 rc = -EFAULT;
1569 if (copy_from_user(&sub_addr, argp,
1570 sizeof(sub_addr)))
1571 goto out_cud_release;
1572 rc = -EINVAL;
1573 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1574 goto out_cud_release;
1575 x25->cudmatchlength = sub_addr.cudmatchlength;
1576 rc = 0;
1577 out_cud_release:
1578 release_sock(sk);
1579 break;
1580 }
1581
1582 case SIOCX25CALLACCPTAPPRV: {
1583 rc = -EINVAL;
1584 lock_kernel();
1585 if (sk->sk_state != TCP_CLOSE)
1586 break;
1587 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1588 unlock_kernel();
1589 rc = 0;
1590 break;
1591 }
1592
1593 case SIOCX25SENDCALLACCPT: {
1594 rc = -EINVAL;
1595 lock_kernel();
1596 if (sk->sk_state != TCP_ESTABLISHED)
1597 break;
1598 /* must call accptapprv above */
1599 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1600 break;
1601 x25_write_internal(sk, X25_CALL_ACCEPTED);
1602 x25->state = X25_STATE_3;
1603 unlock_kernel();
1604 rc = 0;
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 struct hlist_node *node;
1782
1783 write_lock_bh(&x25_list_lock);
1784
1785 sk_for_each(s, node, &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);
AMDTP streaming driver for the Linux FireWire stack (Juju)