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USB: use PM core routines to enable/disable autosuspend
[linux-2.6.git] / net / x25 / af_x25.c
blob36e84e13c6aa9f6167d9b6ba2cf48b72829c2d58
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 lock_kernel();
457 if (level != SOL_X25 || optname != X25_QBITINCL)
458 goto out;
459
460 rc = -EINVAL;
461 if (optlen < sizeof(int))
462 goto out;
463
464 rc = -EFAULT;
465 if (get_user(opt, (int __user *)optval))
466 goto out;
467
468 x25_sk(sk)->qbitincl = !!opt;
469 rc = 0;
470 out:
471 unlock_kernel();
472 return rc;
473 }
474
475 static int x25_getsockopt(struct socket *sock, int level, int optname,
476 char __user *optval, int __user *optlen)
477 {
478 struct sock *sk = sock->sk;
479 int val, len, rc = -ENOPROTOOPT;
480
481 lock_kernel();
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 = x25_sk(sk)->qbitincl;
500 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
501 out:
502 unlock_kernel();
503 return rc;
504 }
505
506 static int x25_listen(struct socket *sock, int backlog)
507 {
508 struct sock *sk = sock->sk;
509 int rc = -EOPNOTSUPP;
510
511 lock_kernel();
512 if (sk->sk_state != TCP_LISTEN) {
513 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
514 sk->sk_max_ack_backlog = backlog;
515 sk->sk_state = TCP_LISTEN;
516 rc = 0;
517 }
518 unlock_kernel();
519
520 return rc;
521 }
522
523 static struct proto x25_proto = {
524 .name = "X25",
525 .owner = THIS_MODULE,
526 .obj_size = sizeof(struct x25_sock),
527 };
528
529 static struct sock *x25_alloc_socket(struct net *net)
530 {
531 struct x25_sock *x25;
532 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
533
534 if (!sk)
535 goto out;
536
537 sock_init_data(NULL, sk);
538
539 x25 = x25_sk(sk);
540 skb_queue_head_init(&x25->ack_queue);
541 skb_queue_head_init(&x25->fragment_queue);
542 skb_queue_head_init(&x25->interrupt_in_queue);
543 skb_queue_head_init(&x25->interrupt_out_queue);
544 out:
545 return sk;
546 }
547
548 static int x25_create(struct net *net, struct socket *sock, int protocol,
549 int kern)
550 {
551 struct sock *sk;
552 struct x25_sock *x25;
553 int rc = -EAFNOSUPPORT;
554
555 if (!net_eq(net, &init_net))
556 goto out;
557
558 rc = -ESOCKTNOSUPPORT;
559 if (sock->type != SOCK_SEQPACKET)
560 goto out;
561
562 rc = -EINVAL;
563 if (protocol)
564 goto out;
565
566 rc = -ENOBUFS;
567 if ((sk = x25_alloc_socket(net)) == NULL)
568 goto out;
569
570 x25 = x25_sk(sk);
571
572 sock_init_data(sock, sk);
573
574 x25_init_timers(sk);
575
576 sock->ops = &x25_proto_ops;
577 sk->sk_protocol = protocol;
578 sk->sk_backlog_rcv = x25_backlog_rcv;
579
580 x25->t21 = sysctl_x25_call_request_timeout;
581 x25->t22 = sysctl_x25_reset_request_timeout;
582 x25->t23 = sysctl_x25_clear_request_timeout;
583 x25->t2 = sysctl_x25_ack_holdback_timeout;
584 x25->state = X25_STATE_0;
585 x25->cudmatchlength = 0;
586 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
587 /* on call accept */
588
589 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
590 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
591 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
592 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
593 x25->facilities.throughput = 0; /* by default don't negotiate
594 throughput */
595 x25->facilities.reverse = X25_DEFAULT_REVERSE;
596 x25->dte_facilities.calling_len = 0;
597 x25->dte_facilities.called_len = 0;
598 memset(x25->dte_facilities.called_ae, '\0',
599 sizeof(x25->dte_facilities.called_ae));
600 memset(x25->dte_facilities.calling_ae, '\0',
601 sizeof(x25->dte_facilities.calling_ae));
602
603 rc = 0;
604 out:
605 return rc;
606 }
607
608 static struct sock *x25_make_new(struct sock *osk)
609 {
610 struct sock *sk = NULL;
611 struct x25_sock *x25, *ox25;
612
613 if (osk->sk_type != SOCK_SEQPACKET)
614 goto out;
615
616 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
617 goto out;
618
619 x25 = x25_sk(sk);
620
621 sk->sk_type = osk->sk_type;
622 sk->sk_priority = osk->sk_priority;
623 sk->sk_protocol = osk->sk_protocol;
624 sk->sk_rcvbuf = osk->sk_rcvbuf;
625 sk->sk_sndbuf = osk->sk_sndbuf;
626 sk->sk_state = TCP_ESTABLISHED;
627 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
628 sock_copy_flags(sk, osk);
629
630 ox25 = x25_sk(osk);
631 x25->t21 = ox25->t21;
632 x25->t22 = ox25->t22;
633 x25->t23 = ox25->t23;
634 x25->t2 = ox25->t2;
635 x25->facilities = ox25->facilities;
636 x25->qbitincl = ox25->qbitincl;
637 x25->dte_facilities = ox25->dte_facilities;
638 x25->cudmatchlength = ox25->cudmatchlength;
639 x25->accptapprv = ox25->accptapprv;
640
641 x25_init_timers(sk);
642 out:
643 return sk;
644 }
645
646 static int x25_release(struct socket *sock)
647 {
648 struct sock *sk = sock->sk;
649 struct x25_sock *x25;
650
651 lock_kernel();
652 if (!sk)
653 goto out;
654
655 x25 = x25_sk(sk);
656
657 switch (x25->state) {
658
659 case X25_STATE_0:
660 case X25_STATE_2:
661 x25_disconnect(sk, 0, 0, 0);
662 x25_destroy_socket(sk);
663 goto out;
664
665 case X25_STATE_1:
666 case X25_STATE_3:
667 case X25_STATE_4:
668 x25_clear_queues(sk);
669 x25_write_internal(sk, X25_CLEAR_REQUEST);
670 x25_start_t23timer(sk);
671 x25->state = X25_STATE_2;
672 sk->sk_state = TCP_CLOSE;
673 sk->sk_shutdown |= SEND_SHUTDOWN;
674 sk->sk_state_change(sk);
675 sock_set_flag(sk, SOCK_DEAD);
676 sock_set_flag(sk, SOCK_DESTROY);
677 break;
678 }
679
680 sock_orphan(sk);
681 out:
682 unlock_kernel();
683 return 0;
684 }
685
686 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
687 {
688 struct sock *sk = sock->sk;
689 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
690 int len, i, rc = 0;
691
692 lock_kernel();
693 if (!sock_flag(sk, SOCK_ZAPPED) ||
694 addr_len != sizeof(struct sockaddr_x25) ||
695 addr->sx25_family != AF_X25) {
696 rc = -EINVAL;
697 goto out;
698 }
699
700 len = strlen(addr->sx25_addr.x25_addr);
701 for (i = 0; i < len; i++) {
702 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
703 rc = -EINVAL;
704 goto out;
705 }
706 }
707
708 x25_sk(sk)->source_addr = addr->sx25_addr;
709 x25_insert_socket(sk);
710 sock_reset_flag(sk, SOCK_ZAPPED);
711 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
712 out:
713 unlock_kernel();
714 return rc;
715 }
716
717 static int x25_wait_for_connection_establishment(struct sock *sk)
718 {
719 DECLARE_WAITQUEUE(wait, current);
720 int rc;
721
722 add_wait_queue_exclusive(sk->sk_sleep, &wait);
723 for (;;) {
724 __set_current_state(TASK_INTERRUPTIBLE);
725 rc = -ERESTARTSYS;
726 if (signal_pending(current))
727 break;
728 rc = sock_error(sk);
729 if (rc) {
730 sk->sk_socket->state = SS_UNCONNECTED;
731 break;
732 }
733 rc = 0;
734 if (sk->sk_state != TCP_ESTABLISHED) {
735 release_sock(sk);
736 schedule();
737 lock_sock(sk);
738 } else
739 break;
740 }
741 __set_current_state(TASK_RUNNING);
742 remove_wait_queue(sk->sk_sleep, &wait);
743 return rc;
744 }
745
746 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
747 int addr_len, int flags)
748 {
749 struct sock *sk = sock->sk;
750 struct x25_sock *x25 = x25_sk(sk);
751 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
752 struct x25_route *rt;
753 int rc = 0;
754
755 lock_kernel();
756 lock_sock(sk);
757 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
758 sock->state = SS_CONNECTED;
759 goto out; /* Connect completed during a ERESTARTSYS event */
760 }
761
762 rc = -ECONNREFUSED;
763 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
764 sock->state = SS_UNCONNECTED;
765 goto out;
766 }
767
768 rc = -EISCONN; /* No reconnect on a seqpacket socket */
769 if (sk->sk_state == TCP_ESTABLISHED)
770 goto out;
771
772 sk->sk_state = TCP_CLOSE;
773 sock->state = SS_UNCONNECTED;
774
775 rc = -EINVAL;
776 if (addr_len != sizeof(struct sockaddr_x25) ||
777 addr->sx25_family != AF_X25)
778 goto out;
779
780 rc = -ENETUNREACH;
781 rt = x25_get_route(&addr->sx25_addr);
782 if (!rt)
783 goto out;
784
785 x25->neighbour = x25_get_neigh(rt->dev);
786 if (!x25->neighbour)
787 goto out_put_route;
788
789 x25_limit_facilities(&x25->facilities, x25->neighbour);
790
791 x25->lci = x25_new_lci(x25->neighbour);
792 if (!x25->lci)
793 goto out_put_neigh;
794
795 rc = -EINVAL;
796 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
797 goto out_put_neigh;
798
799 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
800 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
801
802 x25->dest_addr = addr->sx25_addr;
803
804 /* Move to connecting socket, start sending Connect Requests */
805 sock->state = SS_CONNECTING;
806 sk->sk_state = TCP_SYN_SENT;
807
808 x25->state = X25_STATE_1;
809
810 x25_write_internal(sk, X25_CALL_REQUEST);
811
812 x25_start_heartbeat(sk);
813 x25_start_t21timer(sk);
814
815 /* Now the loop */
816 rc = -EINPROGRESS;
817 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
818 goto out_put_neigh;
819
820 rc = x25_wait_for_connection_establishment(sk);
821 if (rc)
822 goto out_put_neigh;
823
824 sock->state = SS_CONNECTED;
825 rc = 0;
826 out_put_neigh:
827 if (rc)
828 x25_neigh_put(x25->neighbour);
829 out_put_route:
830 x25_route_put(rt);
831 out:
832 release_sock(sk);
833 unlock_kernel();
834 return rc;
835 }
836
837 static int x25_wait_for_data(struct sock *sk, long timeout)
838 {
839 DECLARE_WAITQUEUE(wait, current);
840 int rc = 0;
841
842 add_wait_queue_exclusive(sk->sk_sleep, &wait);
843 for (;;) {
844 __set_current_state(TASK_INTERRUPTIBLE);
845 if (sk->sk_shutdown & RCV_SHUTDOWN)
846 break;
847 rc = -ERESTARTSYS;
848 if (signal_pending(current))
849 break;
850 rc = -EAGAIN;
851 if (!timeout)
852 break;
853 rc = 0;
854 if (skb_queue_empty(&sk->sk_receive_queue)) {
855 release_sock(sk);
856 timeout = schedule_timeout(timeout);
857 lock_sock(sk);
858 } else
859 break;
860 }
861 __set_current_state(TASK_RUNNING);
862 remove_wait_queue(sk->sk_sleep, &wait);
863 return rc;
864 }
865
866 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
867 {
868 struct sock *sk = sock->sk;
869 struct sock *newsk;
870 struct sk_buff *skb;
871 int rc = -EINVAL;
872
873 lock_kernel();
874 if (!sk || sk->sk_state != TCP_LISTEN)
875 goto out;
876
877 rc = -EOPNOTSUPP;
878 if (sk->sk_type != SOCK_SEQPACKET)
879 goto out;
880
881 lock_sock(sk);
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 unlock_kernel();
902 return rc;
903 }
904
905 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
906 int *uaddr_len, int peer)
907 {
908 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
909 struct sock *sk = sock->sk;
910 struct x25_sock *x25 = x25_sk(sk);
911 int rc = 0;
912
913 lock_kernel();
914 if (peer) {
915 if (sk->sk_state != TCP_ESTABLISHED) {
916 rc = -ENOTCONN;
917 goto out;
918 }
919 sx25->sx25_addr = x25->dest_addr;
920 } else
921 sx25->sx25_addr = x25->source_addr;
922
923 sx25->sx25_family = AF_X25;
924 *uaddr_len = sizeof(*sx25);
925
926 out:
927 unlock_kernel();
928 return rc;
929 }
930
931 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
932 poll_table *wait)
933 {
934 int rc;
935
936 lock_kernel();
937 rc = datagram_poll(file, sock, wait);
938 unlock_kernel();
939
940 return rc;
941 }
942
943 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
944 unsigned int lci)
945 {
946 struct sock *sk;
947 struct sock *make;
948 struct x25_sock *makex25;
949 struct x25_address source_addr, dest_addr;
950 struct x25_facilities facilities;
951 struct x25_dte_facilities dte_facilities;
952 int len, addr_len, rc;
953
954 /*
955 * Remove the LCI and frame type.
956 */
957 skb_pull(skb, X25_STD_MIN_LEN);
958
959 /*
960 * Extract the X.25 addresses and convert them to ASCII strings,
961 * and remove them.
962 *
963 * Address block is mandatory in call request packets
964 */
965 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
966 if (addr_len <= 0)
967 goto out_clear_request;
968 skb_pull(skb, addr_len);
969
970 /*
971 * Get the length of the facilities, skip past them for the moment
972 * get the call user data because this is needed to determine
973 * the correct listener
974 *
975 * Facilities length is mandatory in call request packets
976 */
977 if (skb->len < 1)
978 goto out_clear_request;
979 len = skb->data[0] + 1;
980 if (skb->len < len)
981 goto out_clear_request;
982 skb_pull(skb,len);
983
984 /*
985 * Find a listener for the particular address/cud pair.
986 */
987 sk = x25_find_listener(&source_addr,skb);
988 skb_push(skb,len);
989
990 if (sk != NULL && sk_acceptq_is_full(sk)) {
991 goto out_sock_put;
992 }
993
994 /*
995 * We dont have any listeners for this incoming call.
996 * Try forwarding it.
997 */
998 if (sk == NULL) {
999 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1000 if (sysctl_x25_forward &&
1001 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1002 {
1003 /* Call was forwarded, dont process it any more */
1004 kfree_skb(skb);
1005 rc = 1;
1006 goto out;
1007 } else {
1008 /* No listeners, can't forward, clear the call */
1009 goto out_clear_request;
1010 }
1011 }
1012
1013 /*
1014 * Try to reach a compromise on the requested facilities.
1015 */
1016 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1017 if (len == -1)
1018 goto out_sock_put;
1019
1020 /*
1021 * current neighbour/link might impose additional limits
1022 * on certain facilties
1023 */
1024
1025 x25_limit_facilities(&facilities, nb);
1026
1027 /*
1028 * Try to create a new socket.
1029 */
1030 make = x25_make_new(sk);
1031 if (!make)
1032 goto out_sock_put;
1033
1034 /*
1035 * Remove the facilities
1036 */
1037 skb_pull(skb, len);
1038
1039 skb->sk = make;
1040 make->sk_state = TCP_ESTABLISHED;
1041
1042 makex25 = x25_sk(make);
1043 makex25->lci = lci;
1044 makex25->dest_addr = dest_addr;
1045 makex25->source_addr = source_addr;
1046 makex25->neighbour = nb;
1047 makex25->facilities = facilities;
1048 makex25->dte_facilities= dte_facilities;
1049 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1050 /* ensure no reverse facil on accept */
1051 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1052 /* ensure no calling address extension on accept */
1053 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1054 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1055
1056 /* Normally all calls are accepted immediatly */
1057 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
1058 x25_write_internal(make, X25_CALL_ACCEPTED);
1059 makex25->state = X25_STATE_3;
1060 }
1061
1062 /*
1063 * Incoming Call User Data.
1064 */
1065 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1066 makex25->calluserdata.cudlength = skb->len;
1067
1068 sk->sk_ack_backlog++;
1069
1070 x25_insert_socket(make);
1071
1072 skb_queue_head(&sk->sk_receive_queue, skb);
1073
1074 x25_start_heartbeat(make);
1075
1076 if (!sock_flag(sk, SOCK_DEAD))
1077 sk->sk_data_ready(sk, skb->len);
1078 rc = 1;
1079 sock_put(sk);
1080 out:
1081 return rc;
1082 out_sock_put:
1083 sock_put(sk);
1084 out_clear_request:
1085 rc = 0;
1086 x25_transmit_clear_request(nb, lci, 0x01);
1087 goto out;
1088 }
1089
1090 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1091 struct msghdr *msg, size_t len)
1092 {
1093 struct sock *sk = sock->sk;
1094 struct x25_sock *x25 = x25_sk(sk);
1095 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1096 struct sockaddr_x25 sx25;
1097 struct sk_buff *skb;
1098 unsigned char *asmptr;
1099 int noblock = msg->msg_flags & MSG_DONTWAIT;
1100 size_t size;
1101 int qbit = 0, rc = -EINVAL;
1102
1103 lock_kernel();
1104 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1105 goto out;
1106
1107 /* we currently don't support segmented records at the user interface */
1108 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1109 goto out;
1110
1111 rc = -EADDRNOTAVAIL;
1112 if (sock_flag(sk, SOCK_ZAPPED))
1113 goto out;
1114
1115 rc = -EPIPE;
1116 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1117 send_sig(SIGPIPE, current, 0);
1118 goto out;
1119 }
1120
1121 rc = -ENETUNREACH;
1122 if (!x25->neighbour)
1123 goto out;
1124
1125 if (usx25) {
1126 rc = -EINVAL;
1127 if (msg->msg_namelen < sizeof(sx25))
1128 goto out;
1129 memcpy(&sx25, usx25, sizeof(sx25));
1130 rc = -EISCONN;
1131 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1132 goto out;
1133 rc = -EINVAL;
1134 if (sx25.sx25_family != AF_X25)
1135 goto out;
1136 } else {
1137 /*
1138 * FIXME 1003.1g - if the socket is like this because
1139 * it has become closed (not started closed) we ought
1140 * to SIGPIPE, EPIPE;
1141 */
1142 rc = -ENOTCONN;
1143 if (sk->sk_state != TCP_ESTABLISHED)
1144 goto out;
1145
1146 sx25.sx25_family = AF_X25;
1147 sx25.sx25_addr = x25->dest_addr;
1148 }
1149
1150 /* Sanity check the packet size */
1151 if (len > 65535) {
1152 rc = -EMSGSIZE;
1153 goto out;
1154 }
1155
1156 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1157
1158 /* Build a packet */
1159 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1160
1161 if ((msg->msg_flags & MSG_OOB) && len > 32)
1162 len = 32;
1163
1164 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1165
1166 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1167 if (!skb)
1168 goto out;
1169 X25_SKB_CB(skb)->flags = msg->msg_flags;
1170
1171 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1172
1173 /*
1174 * Put the data on the end
1175 */
1176 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1177
1178 skb_reset_transport_header(skb);
1179 skb_put(skb, len);
1180
1181 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1182 if (rc)
1183 goto out_kfree_skb;
1184
1185 /*
1186 * If the Q BIT Include socket option is in force, the first
1187 * byte of the user data is the logical value of the Q Bit.
1188 */
1189 if (x25->qbitincl) {
1190 qbit = skb->data[0];
1191 skb_pull(skb, 1);
1192 }
1193
1194 /*
1195 * Push down the X.25 header
1196 */
1197 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1198
1199 if (msg->msg_flags & MSG_OOB) {
1200 if (x25->neighbour->extended) {
1201 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1202 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1203 *asmptr++ = (x25->lci >> 0) & 0xFF;
1204 *asmptr++ = X25_INTERRUPT;
1205 } else {
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_INTERRUPT;
1210 }
1211 } else {
1212 if (x25->neighbour->extended) {
1213 /* Build an Extended X.25 header */
1214 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1216 *asmptr++ = (x25->lci >> 0) & 0xFF;
1217 *asmptr++ = X25_DATA;
1218 *asmptr++ = X25_DATA;
1219 } else {
1220 /* Build an Standard X.25 header */
1221 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1222 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1223 *asmptr++ = (x25->lci >> 0) & 0xFF;
1224 *asmptr++ = X25_DATA;
1225 }
1226
1227 if (qbit)
1228 skb->data[0] |= X25_Q_BIT;
1229 }
1230
1231 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1232 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1233
1234 rc = -ENOTCONN;
1235 if (sk->sk_state != TCP_ESTABLISHED)
1236 goto out_kfree_skb;
1237
1238 if (msg->msg_flags & MSG_OOB)
1239 skb_queue_tail(&x25->interrupt_out_queue, skb);
1240 else {
1241 rc = x25_output(sk, skb);
1242 len = rc;
1243 if (rc < 0)
1244 kfree_skb(skb);
1245 else if (x25->qbitincl)
1246 len++;
1247 }
1248
1249 /*
1250 * lock_sock() is currently only used to serialize this x25_kick()
1251 * against input-driven x25_kick() calls. It currently only blocks
1252 * incoming packets for this socket and does not protect against
1253 * any other socket state changes and is not called from anywhere
1254 * else. As x25_kick() cannot block and as long as all socket
1255 * operations are BKL-wrapped, we don't need take to care about
1256 * purging the backlog queue in x25_release().
1257 *
1258 * Using lock_sock() to protect all socket operations entirely
1259 * (and making the whole x25 stack SMP aware) unfortunately would
1260 * require major changes to {send,recv}msg and skb allocation methods.
1261 * -> 2.5 ;)
1262 */
1263 lock_sock(sk);
1264 x25_kick(sk);
1265 release_sock(sk);
1266 rc = len;
1267 out:
1268 unlock_kernel();
1269 return rc;
1270 out_kfree_skb:
1271 kfree_skb(skb);
1272 goto out;
1273 }
1274
1275
1276 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1277 struct msghdr *msg, size_t size,
1278 int flags)
1279 {
1280 struct sock *sk = sock->sk;
1281 struct x25_sock *x25 = x25_sk(sk);
1282 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1283 size_t copied;
1284 int qbit;
1285 struct sk_buff *skb;
1286 unsigned char *asmptr;
1287 int rc = -ENOTCONN;
1288
1289 lock_kernel();
1290 /*
1291 * This works for seqpacket too. The receiver has ordered the queue for
1292 * us! We do one quick check first though
1293 */
1294 if (sk->sk_state != TCP_ESTABLISHED)
1295 goto out;
1296
1297 if (flags & MSG_OOB) {
1298 rc = -EINVAL;
1299 if (sock_flag(sk, SOCK_URGINLINE) ||
1300 !skb_peek(&x25->interrupt_in_queue))
1301 goto out;
1302
1303 skb = skb_dequeue(&x25->interrupt_in_queue);
1304
1305 skb_pull(skb, X25_STD_MIN_LEN);
1306
1307 /*
1308 * No Q bit information on Interrupt data.
1309 */
1310 if (x25->qbitincl) {
1311 asmptr = skb_push(skb, 1);
1312 *asmptr = 0x00;
1313 }
1314
1315 msg->msg_flags |= MSG_OOB;
1316 } else {
1317 /* Now we can treat all alike */
1318 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1319 flags & MSG_DONTWAIT, &rc);
1320 if (!skb)
1321 goto out;
1322
1323 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1324
1325 skb_pull(skb, x25->neighbour->extended ?
1326 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1327
1328 if (x25->qbitincl) {
1329 asmptr = skb_push(skb, 1);
1330 *asmptr = qbit;
1331 }
1332 }
1333
1334 skb_reset_transport_header(skb);
1335 copied = skb->len;
1336
1337 if (copied > size) {
1338 copied = size;
1339 msg->msg_flags |= MSG_TRUNC;
1340 }
1341
1342 /* Currently, each datagram always contains a complete record */
1343 msg->msg_flags |= MSG_EOR;
1344
1345 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1346 if (rc)
1347 goto out_free_dgram;
1348
1349 if (sx25) {
1350 sx25->sx25_family = AF_X25;
1351 sx25->sx25_addr = x25->dest_addr;
1352 }
1353
1354 msg->msg_namelen = sizeof(struct sockaddr_x25);
1355
1356 lock_sock(sk);
1357 x25_check_rbuf(sk);
1358 release_sock(sk);
1359 rc = copied;
1360 out_free_dgram:
1361 skb_free_datagram(sk, skb);
1362 out:
1363 unlock_kernel();
1364 return rc;
1365 }
1366
1367
1368 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1369 {
1370 struct sock *sk = sock->sk;
1371 struct x25_sock *x25 = x25_sk(sk);
1372 void __user *argp = (void __user *)arg;
1373 int rc;
1374
1375 lock_kernel();
1376 switch (cmd) {
1377 case TIOCOUTQ: {
1378 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1379
1380 if (amount < 0)
1381 amount = 0;
1382 rc = put_user(amount, (unsigned int __user *)argp);
1383 break;
1384 }
1385
1386 case TIOCINQ: {
1387 struct sk_buff *skb;
1388 int amount = 0;
1389 /*
1390 * These two are safe on a single CPU system as
1391 * only user tasks fiddle here
1392 */
1393 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1394 amount = skb->len;
1395 rc = put_user(amount, (unsigned int __user *)argp);
1396 break;
1397 }
1398
1399 case SIOCGSTAMP:
1400 rc = -EINVAL;
1401 if (sk)
1402 rc = sock_get_timestamp(sk,
1403 (struct timeval __user *)argp);
1404 break;
1405 case SIOCGSTAMPNS:
1406 rc = -EINVAL;
1407 if (sk)
1408 rc = sock_get_timestampns(sk,
1409 (struct timespec __user *)argp);
1410 break;
1411 case SIOCGIFADDR:
1412 case SIOCSIFADDR:
1413 case SIOCGIFDSTADDR:
1414 case SIOCSIFDSTADDR:
1415 case SIOCGIFBRDADDR:
1416 case SIOCSIFBRDADDR:
1417 case SIOCGIFNETMASK:
1418 case SIOCSIFNETMASK:
1419 case SIOCGIFMETRIC:
1420 case SIOCSIFMETRIC:
1421 rc = -EINVAL;
1422 break;
1423 case SIOCADDRT:
1424 case SIOCDELRT:
1425 rc = -EPERM;
1426 if (!capable(CAP_NET_ADMIN))
1427 break;
1428 rc = x25_route_ioctl(cmd, argp);
1429 break;
1430 case SIOCX25GSUBSCRIP:
1431 rc = x25_subscr_ioctl(cmd, argp);
1432 break;
1433 case SIOCX25SSUBSCRIP:
1434 rc = -EPERM;
1435 if (!capable(CAP_NET_ADMIN))
1436 break;
1437 rc = x25_subscr_ioctl(cmd, argp);
1438 break;
1439 case SIOCX25GFACILITIES: {
1440 struct x25_facilities fac = x25->facilities;
1441 rc = copy_to_user(argp, &fac,
1442 sizeof(fac)) ? -EFAULT : 0;
1443 break;
1444 }
1445
1446 case SIOCX25SFACILITIES: {
1447 struct x25_facilities facilities;
1448 rc = -EFAULT;
1449 if (copy_from_user(&facilities, argp,
1450 sizeof(facilities)))
1451 break;
1452 rc = -EINVAL;
1453 if (sk->sk_state != TCP_LISTEN &&
1454 sk->sk_state != TCP_CLOSE)
1455 break;
1456 if (facilities.pacsize_in < X25_PS16 ||
1457 facilities.pacsize_in > X25_PS4096)
1458 break;
1459 if (facilities.pacsize_out < X25_PS16 ||
1460 facilities.pacsize_out > X25_PS4096)
1461 break;
1462 if (facilities.winsize_in < 1 ||
1463 facilities.winsize_in > 127)
1464 break;
1465 if (facilities.throughput) {
1466 int out = facilities.throughput & 0xf0;
1467 int in = facilities.throughput & 0x0f;
1468 if (!out)
1469 facilities.throughput |=
1470 X25_DEFAULT_THROUGHPUT << 4;
1471 else if (out < 0x30 || out > 0xD0)
1472 break;
1473 if (!in)
1474 facilities.throughput |=
1475 X25_DEFAULT_THROUGHPUT;
1476 else if (in < 0x03 || in > 0x0D)
1477 break;
1478 }
1479 if (facilities.reverse &&
1480 (facilities.reverse & 0x81) != 0x81)
1481 break;
1482 x25->facilities = facilities;
1483 rc = 0;
1484 break;
1485 }
1486
1487 case SIOCX25GDTEFACILITIES: {
1488 rc = copy_to_user(argp, &x25->dte_facilities,
1489 sizeof(x25->dte_facilities));
1490 if (rc)
1491 rc = -EFAULT;
1492 break;
1493 }
1494
1495 case SIOCX25SDTEFACILITIES: {
1496 struct x25_dte_facilities dtefacs;
1497 rc = -EFAULT;
1498 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1499 break;
1500 rc = -EINVAL;
1501 if (sk->sk_state != TCP_LISTEN &&
1502 sk->sk_state != TCP_CLOSE)
1503 break;
1504 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1505 break;
1506 if (dtefacs.calling_ae == NULL)
1507 break;
1508 if (dtefacs.called_len > X25_MAX_AE_LEN)
1509 break;
1510 if (dtefacs.called_ae == NULL)
1511 break;
1512 x25->dte_facilities = dtefacs;
1513 rc = 0;
1514 break;
1515 }
1516
1517 case SIOCX25GCALLUSERDATA: {
1518 struct x25_calluserdata cud = x25->calluserdata;
1519 rc = copy_to_user(argp, &cud,
1520 sizeof(cud)) ? -EFAULT : 0;
1521 break;
1522 }
1523
1524 case SIOCX25SCALLUSERDATA: {
1525 struct x25_calluserdata calluserdata;
1526
1527 rc = -EFAULT;
1528 if (copy_from_user(&calluserdata, argp,
1529 sizeof(calluserdata)))
1530 break;
1531 rc = -EINVAL;
1532 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1533 break;
1534 x25->calluserdata = calluserdata;
1535 rc = 0;
1536 break;
1537 }
1538
1539 case SIOCX25GCAUSEDIAG: {
1540 struct x25_causediag causediag;
1541 causediag = x25->causediag;
1542 rc = copy_to_user(argp, &causediag,
1543 sizeof(causediag)) ? -EFAULT : 0;
1544 break;
1545 }
1546
1547 case SIOCX25SCAUSEDIAG: {
1548 struct x25_causediag causediag;
1549 rc = -EFAULT;
1550 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1551 break;
1552 x25->causediag = causediag;
1553 rc = 0;
1554 break;
1555
1556 }
1557
1558 case SIOCX25SCUDMATCHLEN: {
1559 struct x25_subaddr sub_addr;
1560 rc = -EINVAL;
1561 if(sk->sk_state != TCP_CLOSE)
1562 break;
1563 rc = -EFAULT;
1564 if (copy_from_user(&sub_addr, argp,
1565 sizeof(sub_addr)))
1566 break;
1567 rc = -EINVAL;
1568 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1569 break;
1570 x25->cudmatchlength = sub_addr.cudmatchlength;
1571 rc = 0;
1572 break;
1573 }
1574
1575 case SIOCX25CALLACCPTAPPRV: {
1576 rc = -EINVAL;
1577 if (sk->sk_state != TCP_CLOSE)
1578 break;
1579 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1580 rc = 0;
1581 break;
1582 }
1583
1584 case SIOCX25SENDCALLACCPT: {
1585 rc = -EINVAL;
1586 if (sk->sk_state != TCP_ESTABLISHED)
1587 break;
1588 if (x25->accptapprv) /* must call accptapprv above */
1589 break;
1590 x25_write_internal(sk, X25_CALL_ACCEPTED);
1591 x25->state = X25_STATE_3;
1592 rc = 0;
1593 break;
1594 }
1595
1596 default:
1597 rc = -ENOIOCTLCMD;
1598 break;
1599 }
1600 unlock_kernel();
1601
1602 return rc;
1603 }
1604
1605 static const struct net_proto_family x25_family_ops = {
1606 .family = AF_X25,
1607 .create = x25_create,
1608 .owner = THIS_MODULE,
1609 };
1610
1611 #ifdef CONFIG_COMPAT
1612 static int compat_x25_subscr_ioctl(unsigned int cmd,
1613 struct compat_x25_subscrip_struct __user *x25_subscr32)
1614 {
1615 struct compat_x25_subscrip_struct x25_subscr;
1616 struct x25_neigh *nb;
1617 struct net_device *dev;
1618 int rc = -EINVAL;
1619
1620 rc = -EFAULT;
1621 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1622 goto out;
1623
1624 rc = -EINVAL;
1625 dev = x25_dev_get(x25_subscr.device);
1626 if (dev == NULL)
1627 goto out;
1628
1629 nb = x25_get_neigh(dev);
1630 if (nb == NULL)
1631 goto out_dev_put;
1632
1633 dev_put(dev);
1634
1635 if (cmd == SIOCX25GSUBSCRIP) {
1636 x25_subscr.extended = nb->extended;
1637 x25_subscr.global_facil_mask = nb->global_facil_mask;
1638 rc = copy_to_user(x25_subscr32, &x25_subscr,
1639 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1640 } else {
1641 rc = -EINVAL;
1642 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1643 rc = 0;
1644 nb->extended = x25_subscr.extended;
1645 nb->global_facil_mask = x25_subscr.global_facil_mask;
1646 }
1647 }
1648 x25_neigh_put(nb);
1649 out:
1650 return rc;
1651 out_dev_put:
1652 dev_put(dev);
1653 goto out;
1654 }
1655
1656 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1657 unsigned long arg)
1658 {
1659 void __user *argp = compat_ptr(arg);
1660 struct sock *sk = sock->sk;
1661
1662 int rc = -ENOIOCTLCMD;
1663
1664 switch(cmd) {
1665 case TIOCOUTQ:
1666 case TIOCINQ:
1667 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1668 break;
1669 case SIOCGSTAMP:
1670 rc = -EINVAL;
1671 lock_kernel();
1672 if (sk)
1673 rc = compat_sock_get_timestamp(sk,
1674 (struct timeval __user*)argp);
1675 unlock_kernel();
1676 break;
1677 case SIOCGSTAMPNS:
1678 rc = -EINVAL;
1679 lock_kernel();
1680 if (sk)
1681 rc = compat_sock_get_timestampns(sk,
1682 (struct timespec __user*)argp);
1683 unlock_kernel();
1684 break;
1685 case SIOCGIFADDR:
1686 case SIOCSIFADDR:
1687 case SIOCGIFDSTADDR:
1688 case SIOCSIFDSTADDR:
1689 case SIOCGIFBRDADDR:
1690 case SIOCSIFBRDADDR:
1691 case SIOCGIFNETMASK:
1692 case SIOCSIFNETMASK:
1693 case SIOCGIFMETRIC:
1694 case SIOCSIFMETRIC:
1695 rc = -EINVAL;
1696 break;
1697 case SIOCADDRT:
1698 case SIOCDELRT:
1699 rc = -EPERM;
1700 if (!capable(CAP_NET_ADMIN))
1701 break;
1702 lock_kernel();
1703 rc = x25_route_ioctl(cmd, argp);
1704 unlock_kernel();
1705 break;
1706 case SIOCX25GSUBSCRIP:
1707 lock_kernel();
1708 rc = compat_x25_subscr_ioctl(cmd, argp);
1709 unlock_kernel();
1710 break;
1711 case SIOCX25SSUBSCRIP:
1712 rc = -EPERM;
1713 if (!capable(CAP_NET_ADMIN))
1714 break;
1715 lock_kernel();
1716 rc = compat_x25_subscr_ioctl(cmd, argp);
1717 unlock_kernel();
1718 break;
1719 case SIOCX25GFACILITIES:
1720 case SIOCX25SFACILITIES:
1721 case SIOCX25GDTEFACILITIES:
1722 case SIOCX25SDTEFACILITIES:
1723 case SIOCX25GCALLUSERDATA:
1724 case SIOCX25SCALLUSERDATA:
1725 case SIOCX25GCAUSEDIAG:
1726 case SIOCX25SCAUSEDIAG:
1727 case SIOCX25SCUDMATCHLEN:
1728 case SIOCX25CALLACCPTAPPRV:
1729 case SIOCX25SENDCALLACCPT:
1730 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1731 break;
1732 default:
1733 rc = -ENOIOCTLCMD;
1734 break;
1735 }
1736 return rc;
1737 }
1738 #endif
1739
1740 static const struct proto_ops x25_proto_ops = {
1741 .family = AF_X25,
1742 .owner = THIS_MODULE,
1743 .release = x25_release,
1744 .bind = x25_bind,
1745 .connect = x25_connect,
1746 .socketpair = sock_no_socketpair,
1747 .accept = x25_accept,
1748 .getname = x25_getname,
1749 .poll = x25_datagram_poll,
1750 .ioctl = x25_ioctl,
1751 #ifdef CONFIG_COMPAT
1752 .compat_ioctl = compat_x25_ioctl,
1753 #endif
1754 .listen = x25_listen,
1755 .shutdown = sock_no_shutdown,
1756 .setsockopt = x25_setsockopt,
1757 .getsockopt = x25_getsockopt,
1758 .sendmsg = x25_sendmsg,
1759 .recvmsg = x25_recvmsg,
1760 .mmap = sock_no_mmap,
1761 .sendpage = sock_no_sendpage,
1762 };
1763
1764 static struct packet_type x25_packet_type __read_mostly = {
1765 .type = cpu_to_be16(ETH_P_X25),
1766 .func = x25_lapb_receive_frame,
1767 };
1768
1769 static struct notifier_block x25_dev_notifier = {
1770 .notifier_call = x25_device_event,
1771 };
1772
1773 void x25_kill_by_neigh(struct x25_neigh *nb)
1774 {
1775 struct sock *s;
1776 struct hlist_node *node;
1777
1778 write_lock_bh(&x25_list_lock);
1779
1780 sk_for_each(s, node, &x25_list)
1781 if (x25_sk(s)->neighbour == nb)
1782 x25_disconnect(s, ENETUNREACH, 0, 0);
1783
1784 write_unlock_bh(&x25_list_lock);
1785
1786 /* Remove any related forwards */
1787 x25_clear_forward_by_dev(nb->dev);
1788 }
1789
1790 static int __init x25_init(void)
1791 {
1792 int rc = proto_register(&x25_proto, 0);
1793
1794 if (rc != 0)
1795 goto out;
1796
1797 rc = sock_register(&x25_family_ops);
1798 if (rc != 0)
1799 goto out_proto;
1800
1801 dev_add_pack(&x25_packet_type);
1802
1803 rc = register_netdevice_notifier(&x25_dev_notifier);
1804 if (rc != 0)
1805 goto out_sock;
1806
1807 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1808
1809 x25_register_sysctl();
1810 rc = x25_proc_init();
1811 if (rc != 0)
1812 goto out_dev;
1813 out:
1814 return rc;
1815 out_dev:
1816 unregister_netdevice_notifier(&x25_dev_notifier);
1817 out_sock:
1818 sock_unregister(AF_X25);
1819 out_proto:
1820 proto_unregister(&x25_proto);
1821 goto out;
1822 }
1823 module_init(x25_init);
1824
1825 static void __exit x25_exit(void)
1826 {
1827 x25_proc_exit();
1828 x25_link_free();
1829 x25_route_free();
1830
1831 x25_unregister_sysctl();
1832
1833 unregister_netdevice_notifier(&x25_dev_notifier);
1834
1835 dev_remove_pack(&x25_packet_type);
1836
1837 sock_unregister(AF_X25);
1838 proto_unregister(&x25_proto);
1839 }
1840 module_exit(x25_exit);
1841
1842 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1843 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1844 MODULE_LICENSE("GPL");
1845 MODULE_ALIAS_NETPROTO(PF_X25);
Linus' kernel tree