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Linux 2.6.33-rc6
[cris-mirror.git] / net / x25 / af_x25.c
blobe3219e4cd0445195ecda74030191f03a49438fde
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 <net/sock.h>
51 #include <net/tcp_states.h>
52 #include <asm/uaccess.h>
53 #include <linux/fcntl.h>
54 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
55 #include <linux/notifier.h>
56 #include <linux/init.h>
57 #include <linux/compat.h>
58
59 #include <net/x25.h>
60 #include <net/compat.h>
61
62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
63 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
64 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
65 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
66 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
67 int sysctl_x25_forward = 0;
68
69 HLIST_HEAD(x25_list);
70 DEFINE_RWLOCK(x25_list_lock);
71
72 static const struct proto_ops x25_proto_ops;
73
74 static struct x25_address null_x25_address = {" "};
75
76 #ifdef CONFIG_COMPAT
77 struct compat_x25_subscrip_struct {
78 char device[200-sizeof(compat_ulong_t)];
79 compat_ulong_t global_facil_mask;
80 compat_uint_t extended;
81 };
82 #endif
83
84 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
85 struct x25_address *calling_addr)
86 {
87 unsigned int called_len, calling_len;
88 char *called, *calling;
89 unsigned int i;
90
91 called_len = (*p >> 0) & 0x0F;
92 calling_len = (*p >> 4) & 0x0F;
93
94 called = called_addr->x25_addr;
95 calling = calling_addr->x25_addr;
96 p++;
97
98 for (i = 0; i < (called_len + calling_len); i++) {
99 if (i < called_len) {
100 if (i % 2 != 0) {
101 *called++ = ((*p >> 0) & 0x0F) + '0';
102 p++;
103 } else {
104 *called++ = ((*p >> 4) & 0x0F) + '0';
105 }
106 } else {
107 if (i % 2 != 0) {
108 *calling++ = ((*p >> 0) & 0x0F) + '0';
109 p++;
110 } else {
111 *calling++ = ((*p >> 4) & 0x0F) + '0';
112 }
113 }
114 }
115
116 *called = *calling = '\0';
117
118 return 1 + (called_len + calling_len + 1) / 2;
119 }
120
121 int x25_addr_aton(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 int i;
127
128 called = called_addr->x25_addr;
129 calling = calling_addr->x25_addr;
130
131 called_len = strlen(called);
132 calling_len = strlen(calling);
133
134 *p++ = (calling_len << 4) | (called_len << 0);
135
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
138 if (i % 2 != 0) {
139 *p |= (*called++ - '0') << 0;
140 p++;
141 } else {
142 *p = 0x00;
143 *p |= (*called++ - '0') << 4;
144 }
145 } else {
146 if (i % 2 != 0) {
147 *p |= (*calling++ - '0') << 0;
148 p++;
149 } else {
150 *p = 0x00;
151 *p |= (*calling++ - '0') << 4;
152 }
153 }
154 }
155
156 return 1 + (called_len + calling_len + 1) / 2;
157 }
158
159 /*
160 * Socket removal during an interrupt is now safe.
161 */
162 static void x25_remove_socket(struct sock *sk)
163 {
164 write_lock_bh(&x25_list_lock);
165 sk_del_node_init(sk);
166 write_unlock_bh(&x25_list_lock);
167 }
168
169 /*
170 * Kill all bound sockets on a dropped device.
171 */
172 static void x25_kill_by_device(struct net_device *dev)
173 {
174 struct sock *s;
175 struct hlist_node *node;
176
177 write_lock_bh(&x25_list_lock);
178
179 sk_for_each(s, node, &x25_list)
180 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
181 x25_disconnect(s, ENETUNREACH, 0, 0);
182
183 write_unlock_bh(&x25_list_lock);
184 }
185
186 /*
187 * Handle device status changes.
188 */
189 static int x25_device_event(struct notifier_block *this, unsigned long event,
190 void *ptr)
191 {
192 struct net_device *dev = ptr;
193 struct x25_neigh *nb;
194
195 if (!net_eq(dev_net(dev), &init_net))
196 return NOTIFY_DONE;
197
198 if (dev->type == ARPHRD_X25
199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
200 || dev->type == ARPHRD_ETHER
201 #endif
202 ) {
203 switch (event) {
204 case NETDEV_UP:
205 x25_link_device_up(dev);
206 break;
207 case NETDEV_GOING_DOWN:
208 nb = x25_get_neigh(dev);
209 if (nb) {
210 x25_terminate_link(nb);
211 x25_neigh_put(nb);
212 }
213 break;
214 case NETDEV_DOWN:
215 x25_kill_by_device(dev);
216 x25_route_device_down(dev);
217 x25_link_device_down(dev);
218 break;
219 }
220 }
221
222 return NOTIFY_DONE;
223 }
224
225 /*
226 * Add a socket to the bound sockets list.
227 */
228 static void x25_insert_socket(struct sock *sk)
229 {
230 write_lock_bh(&x25_list_lock);
231 sk_add_node(sk, &x25_list);
232 write_unlock_bh(&x25_list_lock);
233 }
234
235 /*
236 * Find a socket that wants to accept the Call Request we just
237 * received. Check the full list for an address/cud match.
238 * If no cuds match return the next_best thing, an address match.
239 * Note: if a listening socket has cud set it must only get calls
240 * with matching cud.
241 */
242 static struct sock *x25_find_listener(struct x25_address *addr,
243 struct sk_buff *skb)
244 {
245 struct sock *s;
246 struct sock *next_best;
247 struct hlist_node *node;
248
249 read_lock_bh(&x25_list_lock);
250 next_best = NULL;
251
252 sk_for_each(s, node, &x25_list)
253 if ((!strcmp(addr->x25_addr,
254 x25_sk(s)->source_addr.x25_addr) ||
255 !strcmp(addr->x25_addr,
256 null_x25_address.x25_addr)) &&
257 s->sk_state == TCP_LISTEN) {
258 /*
259 * Found a listening socket, now check the incoming
260 * call user data vs this sockets call user data
261 */
262 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
263 if((memcmp(x25_sk(s)->calluserdata.cuddata,
264 skb->data,
265 x25_sk(s)->cudmatchlength)) == 0) {
266 sock_hold(s);
267 goto found;
268 }
269 } else
270 next_best = s;
271 }
272 if (next_best) {
273 s = next_best;
274 sock_hold(s);
275 goto found;
276 }
277 s = NULL;
278 found:
279 read_unlock_bh(&x25_list_lock);
280 return s;
281 }
282
283 /*
284 * Find a connected X.25 socket given my LCI and neighbour.
285 */
286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
287 {
288 struct sock *s;
289 struct hlist_node *node;
290
291 sk_for_each(s, node, &x25_list)
292 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
293 sock_hold(s);
294 goto found;
295 }
296 s = NULL;
297 found:
298 return s;
299 }
300
301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
302 {
303 struct sock *s;
304
305 read_lock_bh(&x25_list_lock);
306 s = __x25_find_socket(lci, nb);
307 read_unlock_bh(&x25_list_lock);
308 return s;
309 }
310
311 /*
312 * Find a unique LCI for a given device.
313 */
314 static unsigned int x25_new_lci(struct x25_neigh *nb)
315 {
316 unsigned int lci = 1;
317 struct sock *sk;
318
319 read_lock_bh(&x25_list_lock);
320
321 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
322 sock_put(sk);
323 if (++lci == 4096) {
324 lci = 0;
325 break;
326 }
327 }
328
329 read_unlock_bh(&x25_list_lock);
330 return lci;
331 }
332
333 /*
334 * Deferred destroy.
335 */
336 static void __x25_destroy_socket(struct sock *);
337
338 /*
339 * handler for deferred kills.
340 */
341 static void x25_destroy_timer(unsigned long data)
342 {
343 x25_destroy_socket_from_timer((struct sock *)data);
344 }
345
346 /*
347 * This is called from user mode and the timers. Thus it protects itself
348 * against interrupt users but doesn't worry about being called during
349 * work. Once it is removed from the queue no interrupt or bottom half
350 * will touch it and we are (fairly 8-) ) safe.
351 * Not static as it's used by the timer
352 */
353 static void __x25_destroy_socket(struct sock *sk)
354 {
355 struct sk_buff *skb;
356
357 x25_stop_heartbeat(sk);
358 x25_stop_timer(sk);
359
360 x25_remove_socket(sk);
361 x25_clear_queues(sk); /* Flush the queues */
362
363 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
364 if (skb->sk != sk) { /* A pending connection */
365 /*
366 * Queue the unaccepted socket for death
367 */
368 sock_set_flag(skb->sk, SOCK_DEAD);
369 x25_start_heartbeat(skb->sk);
370 x25_sk(skb->sk)->state = X25_STATE_0;
371 }
372
373 kfree_skb(skb);
374 }
375
376 if (sk_has_allocations(sk)) {
377 /* Defer: outstanding buffers */
378 sk->sk_timer.expires = jiffies + 10 * HZ;
379 sk->sk_timer.function = x25_destroy_timer;
380 sk->sk_timer.data = (unsigned long)sk;
381 add_timer(&sk->sk_timer);
382 } else {
383 /* drop last reference so sock_put will free */
384 __sock_put(sk);
385 }
386 }
387
388 void x25_destroy_socket_from_timer(struct sock *sk)
389 {
390 sock_hold(sk);
391 bh_lock_sock(sk);
392 __x25_destroy_socket(sk);
393 bh_unlock_sock(sk);
394 sock_put(sk);
395 }
396
397 static void x25_destroy_socket(struct sock *sk)
398 {
399 sock_hold(sk);
400 lock_sock(sk);
401 __x25_destroy_socket(sk);
402 release_sock(sk);
403 sock_put(sk);
404 }
405
406 /*
407 * Handling for system calls applied via the various interfaces to a
408 * X.25 socket object.
409 */
410
411 static int x25_setsockopt(struct socket *sock, int level, int optname,
412 char __user *optval, unsigned int optlen)
413 {
414 int opt;
415 struct sock *sk = sock->sk;
416 int rc = -ENOPROTOOPT;
417
418 lock_kernel();
419 if (level != SOL_X25 || optname != X25_QBITINCL)
420 goto out;
421
422 rc = -EINVAL;
423 if (optlen < sizeof(int))
424 goto out;
425
426 rc = -EFAULT;
427 if (get_user(opt, (int __user *)optval))
428 goto out;
429
430 x25_sk(sk)->qbitincl = !!opt;
431 rc = 0;
432 out:
433 unlock_kernel();
434 return rc;
435 }
436
437 static int x25_getsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, int __user *optlen)
439 {
440 struct sock *sk = sock->sk;
441 int val, len, rc = -ENOPROTOOPT;
442
443 lock_kernel();
444 if (level != SOL_X25 || optname != X25_QBITINCL)
445 goto out;
446
447 rc = -EFAULT;
448 if (get_user(len, optlen))
449 goto out;
450
451 len = min_t(unsigned int, len, sizeof(int));
452
453 rc = -EINVAL;
454 if (len < 0)
455 goto out;
456
457 rc = -EFAULT;
458 if (put_user(len, optlen))
459 goto out;
460
461 val = x25_sk(sk)->qbitincl;
462 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
463 out:
464 unlock_kernel();
465 return rc;
466 }
467
468 static int x25_listen(struct socket *sock, int backlog)
469 {
470 struct sock *sk = sock->sk;
471 int rc = -EOPNOTSUPP;
472
473 lock_kernel();
474 if (sk->sk_state != TCP_LISTEN) {
475 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
476 sk->sk_max_ack_backlog = backlog;
477 sk->sk_state = TCP_LISTEN;
478 rc = 0;
479 }
480 unlock_kernel();
481
482 return rc;
483 }
484
485 static struct proto x25_proto = {
486 .name = "X25",
487 .owner = THIS_MODULE,
488 .obj_size = sizeof(struct x25_sock),
489 };
490
491 static struct sock *x25_alloc_socket(struct net *net)
492 {
493 struct x25_sock *x25;
494 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
495
496 if (!sk)
497 goto out;
498
499 sock_init_data(NULL, sk);
500
501 x25 = x25_sk(sk);
502 skb_queue_head_init(&x25->ack_queue);
503 skb_queue_head_init(&x25->fragment_queue);
504 skb_queue_head_init(&x25->interrupt_in_queue);
505 skb_queue_head_init(&x25->interrupt_out_queue);
506 out:
507 return sk;
508 }
509
510 static int x25_create(struct net *net, struct socket *sock, int protocol,
511 int kern)
512 {
513 struct sock *sk;
514 struct x25_sock *x25;
515 int rc = -ESOCKTNOSUPPORT;
516
517 if (!net_eq(net, &init_net))
518 return -EAFNOSUPPORT;
519
520 if (sock->type != SOCK_SEQPACKET || protocol)
521 goto out;
522
523 rc = -ENOMEM;
524 if ((sk = x25_alloc_socket(net)) == NULL)
525 goto out;
526
527 x25 = x25_sk(sk);
528
529 sock_init_data(sock, sk);
530
531 x25_init_timers(sk);
532
533 sock->ops = &x25_proto_ops;
534 sk->sk_protocol = protocol;
535 sk->sk_backlog_rcv = x25_backlog_rcv;
536
537 x25->t21 = sysctl_x25_call_request_timeout;
538 x25->t22 = sysctl_x25_reset_request_timeout;
539 x25->t23 = sysctl_x25_clear_request_timeout;
540 x25->t2 = sysctl_x25_ack_holdback_timeout;
541 x25->state = X25_STATE_0;
542 x25->cudmatchlength = 0;
543 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
544 /* on call accept */
545
546 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
547 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
548 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
549 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
550 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
551 x25->facilities.reverse = X25_DEFAULT_REVERSE;
552 x25->dte_facilities.calling_len = 0;
553 x25->dte_facilities.called_len = 0;
554 memset(x25->dte_facilities.called_ae, '\0',
555 sizeof(x25->dte_facilities.called_ae));
556 memset(x25->dte_facilities.calling_ae, '\0',
557 sizeof(x25->dte_facilities.calling_ae));
558
559 rc = 0;
560 out:
561 return rc;
562 }
563
564 static struct sock *x25_make_new(struct sock *osk)
565 {
566 struct sock *sk = NULL;
567 struct x25_sock *x25, *ox25;
568
569 if (osk->sk_type != SOCK_SEQPACKET)
570 goto out;
571
572 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
573 goto out;
574
575 x25 = x25_sk(sk);
576
577 sk->sk_type = osk->sk_type;
578 sk->sk_priority = osk->sk_priority;
579 sk->sk_protocol = osk->sk_protocol;
580 sk->sk_rcvbuf = osk->sk_rcvbuf;
581 sk->sk_sndbuf = osk->sk_sndbuf;
582 sk->sk_state = TCP_ESTABLISHED;
583 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
584 sock_copy_flags(sk, osk);
585
586 ox25 = x25_sk(osk);
587 x25->t21 = ox25->t21;
588 x25->t22 = ox25->t22;
589 x25->t23 = ox25->t23;
590 x25->t2 = ox25->t2;
591 x25->facilities = ox25->facilities;
592 x25->qbitincl = ox25->qbitincl;
593 x25->dte_facilities = ox25->dte_facilities;
594 x25->cudmatchlength = ox25->cudmatchlength;
595 x25->accptapprv = ox25->accptapprv;
596
597 x25_init_timers(sk);
598 out:
599 return sk;
600 }
601
602 static int x25_release(struct socket *sock)
603 {
604 struct sock *sk = sock->sk;
605 struct x25_sock *x25;
606
607 lock_kernel();
608 if (!sk)
609 goto out;
610
611 x25 = x25_sk(sk);
612
613 switch (x25->state) {
614
615 case X25_STATE_0:
616 case X25_STATE_2:
617 x25_disconnect(sk, 0, 0, 0);
618 x25_destroy_socket(sk);
619 goto out;
620
621 case X25_STATE_1:
622 case X25_STATE_3:
623 case X25_STATE_4:
624 x25_clear_queues(sk);
625 x25_write_internal(sk, X25_CLEAR_REQUEST);
626 x25_start_t23timer(sk);
627 x25->state = X25_STATE_2;
628 sk->sk_state = TCP_CLOSE;
629 sk->sk_shutdown |= SEND_SHUTDOWN;
630 sk->sk_state_change(sk);
631 sock_set_flag(sk, SOCK_DEAD);
632 sock_set_flag(sk, SOCK_DESTROY);
633 break;
634 }
635
636 sock_orphan(sk);
637 out:
638 unlock_kernel();
639 return 0;
640 }
641
642 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
643 {
644 struct sock *sk = sock->sk;
645 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
646 int rc = 0;
647
648 lock_kernel();
649 if (!sock_flag(sk, SOCK_ZAPPED) ||
650 addr_len != sizeof(struct sockaddr_x25) ||
651 addr->sx25_family != AF_X25) {
652 rc = -EINVAL;
653 goto out;
654 }
655
656 x25_sk(sk)->source_addr = addr->sx25_addr;
657 x25_insert_socket(sk);
658 sock_reset_flag(sk, SOCK_ZAPPED);
659 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
660 out:
661 unlock_kernel();
662 return rc;
663 }
664
665 static int x25_wait_for_connection_establishment(struct sock *sk)
666 {
667 DECLARE_WAITQUEUE(wait, current);
668 int rc;
669
670 add_wait_queue_exclusive(sk->sk_sleep, &wait);
671 for (;;) {
672 __set_current_state(TASK_INTERRUPTIBLE);
673 rc = -ERESTARTSYS;
674 if (signal_pending(current))
675 break;
676 rc = sock_error(sk);
677 if (rc) {
678 sk->sk_socket->state = SS_UNCONNECTED;
679 break;
680 }
681 rc = 0;
682 if (sk->sk_state != TCP_ESTABLISHED) {
683 release_sock(sk);
684 schedule();
685 lock_sock(sk);
686 } else
687 break;
688 }
689 __set_current_state(TASK_RUNNING);
690 remove_wait_queue(sk->sk_sleep, &wait);
691 return rc;
692 }
693
694 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
695 int addr_len, int flags)
696 {
697 struct sock *sk = sock->sk;
698 struct x25_sock *x25 = x25_sk(sk);
699 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
700 struct x25_route *rt;
701 int rc = 0;
702
703 lock_kernel();
704 lock_sock(sk);
705 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
706 sock->state = SS_CONNECTED;
707 goto out; /* Connect completed during a ERESTARTSYS event */
708 }
709
710 rc = -ECONNREFUSED;
711 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
712 sock->state = SS_UNCONNECTED;
713 goto out;
714 }
715
716 rc = -EISCONN; /* No reconnect on a seqpacket socket */
717 if (sk->sk_state == TCP_ESTABLISHED)
718 goto out;
719
720 sk->sk_state = TCP_CLOSE;
721 sock->state = SS_UNCONNECTED;
722
723 rc = -EINVAL;
724 if (addr_len != sizeof(struct sockaddr_x25) ||
725 addr->sx25_family != AF_X25)
726 goto out;
727
728 rc = -ENETUNREACH;
729 rt = x25_get_route(&addr->sx25_addr);
730 if (!rt)
731 goto out;
732
733 x25->neighbour = x25_get_neigh(rt->dev);
734 if (!x25->neighbour)
735 goto out_put_route;
736
737 x25_limit_facilities(&x25->facilities, x25->neighbour);
738
739 x25->lci = x25_new_lci(x25->neighbour);
740 if (!x25->lci)
741 goto out_put_neigh;
742
743 rc = -EINVAL;
744 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
745 goto out_put_neigh;
746
747 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
748 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
749
750 x25->dest_addr = addr->sx25_addr;
751
752 /* Move to connecting socket, start sending Connect Requests */
753 sock->state = SS_CONNECTING;
754 sk->sk_state = TCP_SYN_SENT;
755
756 x25->state = X25_STATE_1;
757
758 x25_write_internal(sk, X25_CALL_REQUEST);
759
760 x25_start_heartbeat(sk);
761 x25_start_t21timer(sk);
762
763 /* Now the loop */
764 rc = -EINPROGRESS;
765 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
766 goto out_put_neigh;
767
768 rc = x25_wait_for_connection_establishment(sk);
769 if (rc)
770 goto out_put_neigh;
771
772 sock->state = SS_CONNECTED;
773 rc = 0;
774 out_put_neigh:
775 if (rc)
776 x25_neigh_put(x25->neighbour);
777 out_put_route:
778 x25_route_put(rt);
779 out:
780 release_sock(sk);
781 unlock_kernel();
782 return rc;
783 }
784
785 static int x25_wait_for_data(struct sock *sk, long timeout)
786 {
787 DECLARE_WAITQUEUE(wait, current);
788 int rc = 0;
789
790 add_wait_queue_exclusive(sk->sk_sleep, &wait);
791 for (;;) {
792 __set_current_state(TASK_INTERRUPTIBLE);
793 if (sk->sk_shutdown & RCV_SHUTDOWN)
794 break;
795 rc = -ERESTARTSYS;
796 if (signal_pending(current))
797 break;
798 rc = -EAGAIN;
799 if (!timeout)
800 break;
801 rc = 0;
802 if (skb_queue_empty(&sk->sk_receive_queue)) {
803 release_sock(sk);
804 timeout = schedule_timeout(timeout);
805 lock_sock(sk);
806 } else
807 break;
808 }
809 __set_current_state(TASK_RUNNING);
810 remove_wait_queue(sk->sk_sleep, &wait);
811 return rc;
812 }
813
814 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
815 {
816 struct sock *sk = sock->sk;
817 struct sock *newsk;
818 struct sk_buff *skb;
819 int rc = -EINVAL;
820
821 lock_kernel();
822 if (!sk || sk->sk_state != TCP_LISTEN)
823 goto out;
824
825 rc = -EOPNOTSUPP;
826 if (sk->sk_type != SOCK_SEQPACKET)
827 goto out;
828
829 lock_sock(sk);
830 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
831 if (rc)
832 goto out2;
833 skb = skb_dequeue(&sk->sk_receive_queue);
834 rc = -EINVAL;
835 if (!skb->sk)
836 goto out2;
837 newsk = skb->sk;
838 sock_graft(newsk, newsock);
839
840 /* Now attach up the new socket */
841 skb->sk = NULL;
842 kfree_skb(skb);
843 sk->sk_ack_backlog--;
844 newsock->state = SS_CONNECTED;
845 rc = 0;
846 out2:
847 release_sock(sk);
848 out:
849 unlock_kernel();
850 return rc;
851 }
852
853 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
854 int *uaddr_len, int peer)
855 {
856 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
857 struct sock *sk = sock->sk;
858 struct x25_sock *x25 = x25_sk(sk);
859 int rc = 0;
860
861 lock_kernel();
862 if (peer) {
863 if (sk->sk_state != TCP_ESTABLISHED) {
864 rc = -ENOTCONN;
865 goto out;
866 }
867 sx25->sx25_addr = x25->dest_addr;
868 } else
869 sx25->sx25_addr = x25->source_addr;
870
871 sx25->sx25_family = AF_X25;
872 *uaddr_len = sizeof(*sx25);
873
874 out:
875 unlock_kernel();
876 return rc;
877 }
878
879 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
880 poll_table *wait)
881 {
882 int rc;
883
884 lock_kernel();
885 rc = datagram_poll(file, sock, wait);
886 unlock_kernel();
887
888 return rc;
889 }
890
891 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
892 unsigned int lci)
893 {
894 struct sock *sk;
895 struct sock *make;
896 struct x25_sock *makex25;
897 struct x25_address source_addr, dest_addr;
898 struct x25_facilities facilities;
899 struct x25_dte_facilities dte_facilities;
900 int len, addr_len, rc;
901
902 /*
903 * Remove the LCI and frame type.
904 */
905 skb_pull(skb, X25_STD_MIN_LEN);
906
907 /*
908 * Extract the X.25 addresses and convert them to ASCII strings,
909 * and remove them.
910 */
911 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
912 skb_pull(skb, addr_len);
913
914 /*
915 * Get the length of the facilities, skip past them for the moment
916 * get the call user data because this is needed to determine
917 * the correct listener
918 */
919 len = skb->data[0] + 1;
920 skb_pull(skb,len);
921
922 /*
923 * Find a listener for the particular address/cud pair.
924 */
925 sk = x25_find_listener(&source_addr,skb);
926 skb_push(skb,len);
927
928 if (sk != NULL && sk_acceptq_is_full(sk)) {
929 goto out_sock_put;
930 }
931
932 /*
933 * We dont have any listeners for this incoming call.
934 * Try forwarding it.
935 */
936 if (sk == NULL) {
937 skb_push(skb, addr_len + X25_STD_MIN_LEN);
938 if (sysctl_x25_forward &&
939 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
940 {
941 /* Call was forwarded, dont process it any more */
942 kfree_skb(skb);
943 rc = 1;
944 goto out;
945 } else {
946 /* No listeners, can't forward, clear the call */
947 goto out_clear_request;
948 }
949 }
950
951 /*
952 * Try to reach a compromise on the requested facilities.
953 */
954 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
955 if (len == -1)
956 goto out_sock_put;
957
958 /*
959 * current neighbour/link might impose additional limits
960 * on certain facilties
961 */
962
963 x25_limit_facilities(&facilities, nb);
964
965 /*
966 * Try to create a new socket.
967 */
968 make = x25_make_new(sk);
969 if (!make)
970 goto out_sock_put;
971
972 /*
973 * Remove the facilities
974 */
975 skb_pull(skb, len);
976
977 skb->sk = make;
978 make->sk_state = TCP_ESTABLISHED;
979
980 makex25 = x25_sk(make);
981 makex25->lci = lci;
982 makex25->dest_addr = dest_addr;
983 makex25->source_addr = source_addr;
984 makex25->neighbour = nb;
985 makex25->facilities = facilities;
986 makex25->dte_facilities= dte_facilities;
987 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
988 /* ensure no reverse facil on accept */
989 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
990 /* ensure no calling address extension on accept */
991 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
992 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
993
994 /* Normally all calls are accepted immediatly */
995 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
996 x25_write_internal(make, X25_CALL_ACCEPTED);
997 makex25->state = X25_STATE_3;
998 }
999
1000 /*
1001 * Incoming Call User Data.
1002 */
1003 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1004 makex25->calluserdata.cudlength = skb->len;
1005
1006 sk->sk_ack_backlog++;
1007
1008 x25_insert_socket(make);
1009
1010 skb_queue_head(&sk->sk_receive_queue, skb);
1011
1012 x25_start_heartbeat(make);
1013
1014 if (!sock_flag(sk, SOCK_DEAD))
1015 sk->sk_data_ready(sk, skb->len);
1016 rc = 1;
1017 sock_put(sk);
1018 out:
1019 return rc;
1020 out_sock_put:
1021 sock_put(sk);
1022 out_clear_request:
1023 rc = 0;
1024 x25_transmit_clear_request(nb, lci, 0x01);
1025 goto out;
1026 }
1027
1028 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1029 struct msghdr *msg, size_t len)
1030 {
1031 struct sock *sk = sock->sk;
1032 struct x25_sock *x25 = x25_sk(sk);
1033 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1034 struct sockaddr_x25 sx25;
1035 struct sk_buff *skb;
1036 unsigned char *asmptr;
1037 int noblock = msg->msg_flags & MSG_DONTWAIT;
1038 size_t size;
1039 int qbit = 0, rc = -EINVAL;
1040
1041 lock_kernel();
1042 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1043 goto out;
1044
1045 /* we currently don't support segmented records at the user interface */
1046 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1047 goto out;
1048
1049 rc = -EADDRNOTAVAIL;
1050 if (sock_flag(sk, SOCK_ZAPPED))
1051 goto out;
1052
1053 rc = -EPIPE;
1054 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1055 send_sig(SIGPIPE, current, 0);
1056 goto out;
1057 }
1058
1059 rc = -ENETUNREACH;
1060 if (!x25->neighbour)
1061 goto out;
1062
1063 if (usx25) {
1064 rc = -EINVAL;
1065 if (msg->msg_namelen < sizeof(sx25))
1066 goto out;
1067 memcpy(&sx25, usx25, sizeof(sx25));
1068 rc = -EISCONN;
1069 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1070 goto out;
1071 rc = -EINVAL;
1072 if (sx25.sx25_family != AF_X25)
1073 goto out;
1074 } else {
1075 /*
1076 * FIXME 1003.1g - if the socket is like this because
1077 * it has become closed (not started closed) we ought
1078 * to SIGPIPE, EPIPE;
1079 */
1080 rc = -ENOTCONN;
1081 if (sk->sk_state != TCP_ESTABLISHED)
1082 goto out;
1083
1084 sx25.sx25_family = AF_X25;
1085 sx25.sx25_addr = x25->dest_addr;
1086 }
1087
1088 /* Sanity check the packet size */
1089 if (len > 65535) {
1090 rc = -EMSGSIZE;
1091 goto out;
1092 }
1093
1094 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1095
1096 /* Build a packet */
1097 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1098
1099 if ((msg->msg_flags & MSG_OOB) && len > 32)
1100 len = 32;
1101
1102 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1103
1104 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1105 if (!skb)
1106 goto out;
1107 X25_SKB_CB(skb)->flags = msg->msg_flags;
1108
1109 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1110
1111 /*
1112 * Put the data on the end
1113 */
1114 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1115
1116 skb_reset_transport_header(skb);
1117 skb_put(skb, len);
1118
1119 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1120 if (rc)
1121 goto out_kfree_skb;
1122
1123 /*
1124 * If the Q BIT Include socket option is in force, the first
1125 * byte of the user data is the logical value of the Q Bit.
1126 */
1127 if (x25->qbitincl) {
1128 qbit = skb->data[0];
1129 skb_pull(skb, 1);
1130 }
1131
1132 /*
1133 * Push down the X.25 header
1134 */
1135 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1136
1137 if (msg->msg_flags & MSG_OOB) {
1138 if (x25->neighbour->extended) {
1139 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1140 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1141 *asmptr++ = (x25->lci >> 0) & 0xFF;
1142 *asmptr++ = X25_INTERRUPT;
1143 } else {
1144 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1145 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1146 *asmptr++ = (x25->lci >> 0) & 0xFF;
1147 *asmptr++ = X25_INTERRUPT;
1148 }
1149 } else {
1150 if (x25->neighbour->extended) {
1151 /* Build an Extended X.25 header */
1152 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1153 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1154 *asmptr++ = (x25->lci >> 0) & 0xFF;
1155 *asmptr++ = X25_DATA;
1156 *asmptr++ = X25_DATA;
1157 } else {
1158 /* Build an Standard X.25 header */
1159 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1160 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1161 *asmptr++ = (x25->lci >> 0) & 0xFF;
1162 *asmptr++ = X25_DATA;
1163 }
1164
1165 if (qbit)
1166 skb->data[0] |= X25_Q_BIT;
1167 }
1168
1169 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1170 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1171
1172 rc = -ENOTCONN;
1173 if (sk->sk_state != TCP_ESTABLISHED)
1174 goto out_kfree_skb;
1175
1176 if (msg->msg_flags & MSG_OOB)
1177 skb_queue_tail(&x25->interrupt_out_queue, skb);
1178 else {
1179 rc = x25_output(sk, skb);
1180 len = rc;
1181 if (rc < 0)
1182 kfree_skb(skb);
1183 else if (x25->qbitincl)
1184 len++;
1185 }
1186
1187 /*
1188 * lock_sock() is currently only used to serialize this x25_kick()
1189 * against input-driven x25_kick() calls. It currently only blocks
1190 * incoming packets for this socket and does not protect against
1191 * any other socket state changes and is not called from anywhere
1192 * else. As x25_kick() cannot block and as long as all socket
1193 * operations are BKL-wrapped, we don't need take to care about
1194 * purging the backlog queue in x25_release().
1195 *
1196 * Using lock_sock() to protect all socket operations entirely
1197 * (and making the whole x25 stack SMP aware) unfortunately would
1198 * require major changes to {send,recv}msg and skb allocation methods.
1199 * -> 2.5 ;)
1200 */
1201 lock_sock(sk);
1202 x25_kick(sk);
1203 release_sock(sk);
1204 rc = len;
1205 out:
1206 unlock_kernel();
1207 return rc;
1208 out_kfree_skb:
1209 kfree_skb(skb);
1210 goto out;
1211 }
1212
1213
1214 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1215 struct msghdr *msg, size_t size,
1216 int flags)
1217 {
1218 struct sock *sk = sock->sk;
1219 struct x25_sock *x25 = x25_sk(sk);
1220 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1221 size_t copied;
1222 int qbit;
1223 struct sk_buff *skb;
1224 unsigned char *asmptr;
1225 int rc = -ENOTCONN;
1226
1227 lock_kernel();
1228 /*
1229 * This works for seqpacket too. The receiver has ordered the queue for
1230 * us! We do one quick check first though
1231 */
1232 if (sk->sk_state != TCP_ESTABLISHED)
1233 goto out;
1234
1235 if (flags & MSG_OOB) {
1236 rc = -EINVAL;
1237 if (sock_flag(sk, SOCK_URGINLINE) ||
1238 !skb_peek(&x25->interrupt_in_queue))
1239 goto out;
1240
1241 skb = skb_dequeue(&x25->interrupt_in_queue);
1242
1243 skb_pull(skb, X25_STD_MIN_LEN);
1244
1245 /*
1246 * No Q bit information on Interrupt data.
1247 */
1248 if (x25->qbitincl) {
1249 asmptr = skb_push(skb, 1);
1250 *asmptr = 0x00;
1251 }
1252
1253 msg->msg_flags |= MSG_OOB;
1254 } else {
1255 /* Now we can treat all alike */
1256 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1257 flags & MSG_DONTWAIT, &rc);
1258 if (!skb)
1259 goto out;
1260
1261 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1262
1263 skb_pull(skb, x25->neighbour->extended ?
1264 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1265
1266 if (x25->qbitincl) {
1267 asmptr = skb_push(skb, 1);
1268 *asmptr = qbit;
1269 }
1270 }
1271
1272 skb_reset_transport_header(skb);
1273 copied = skb->len;
1274
1275 if (copied > size) {
1276 copied = size;
1277 msg->msg_flags |= MSG_TRUNC;
1278 }
1279
1280 /* Currently, each datagram always contains a complete record */
1281 msg->msg_flags |= MSG_EOR;
1282
1283 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1284 if (rc)
1285 goto out_free_dgram;
1286
1287 if (sx25) {
1288 sx25->sx25_family = AF_X25;
1289 sx25->sx25_addr = x25->dest_addr;
1290 }
1291
1292 msg->msg_namelen = sizeof(struct sockaddr_x25);
1293
1294 lock_sock(sk);
1295 x25_check_rbuf(sk);
1296 release_sock(sk);
1297 rc = copied;
1298 out_free_dgram:
1299 skb_free_datagram(sk, skb);
1300 out:
1301 unlock_kernel();
1302 return rc;
1303 }
1304
1305
1306 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1307 {
1308 struct sock *sk = sock->sk;
1309 struct x25_sock *x25 = x25_sk(sk);
1310 void __user *argp = (void __user *)arg;
1311 int rc;
1312
1313 lock_kernel();
1314 switch (cmd) {
1315 case TIOCOUTQ: {
1316 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1317
1318 if (amount < 0)
1319 amount = 0;
1320 rc = put_user(amount, (unsigned int __user *)argp);
1321 break;
1322 }
1323
1324 case TIOCINQ: {
1325 struct sk_buff *skb;
1326 int amount = 0;
1327 /*
1328 * These two are safe on a single CPU system as
1329 * only user tasks fiddle here
1330 */
1331 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1332 amount = skb->len;
1333 rc = put_user(amount, (unsigned int __user *)argp);
1334 break;
1335 }
1336
1337 case SIOCGSTAMP:
1338 rc = -EINVAL;
1339 if (sk)
1340 rc = sock_get_timestamp(sk,
1341 (struct timeval __user *)argp);
1342 break;
1343 case SIOCGSTAMPNS:
1344 rc = -EINVAL;
1345 if (sk)
1346 rc = sock_get_timestampns(sk,
1347 (struct timespec __user *)argp);
1348 break;
1349 case SIOCGIFADDR:
1350 case SIOCSIFADDR:
1351 case SIOCGIFDSTADDR:
1352 case SIOCSIFDSTADDR:
1353 case SIOCGIFBRDADDR:
1354 case SIOCSIFBRDADDR:
1355 case SIOCGIFNETMASK:
1356 case SIOCSIFNETMASK:
1357 case SIOCGIFMETRIC:
1358 case SIOCSIFMETRIC:
1359 rc = -EINVAL;
1360 break;
1361 case SIOCADDRT:
1362 case SIOCDELRT:
1363 rc = -EPERM;
1364 if (!capable(CAP_NET_ADMIN))
1365 break;
1366 rc = x25_route_ioctl(cmd, argp);
1367 break;
1368 case SIOCX25GSUBSCRIP:
1369 rc = x25_subscr_ioctl(cmd, argp);
1370 break;
1371 case SIOCX25SSUBSCRIP:
1372 rc = -EPERM;
1373 if (!capable(CAP_NET_ADMIN))
1374 break;
1375 rc = x25_subscr_ioctl(cmd, argp);
1376 break;
1377 case SIOCX25GFACILITIES: {
1378 struct x25_facilities fac = x25->facilities;
1379 rc = copy_to_user(argp, &fac,
1380 sizeof(fac)) ? -EFAULT : 0;
1381 break;
1382 }
1383
1384 case SIOCX25SFACILITIES: {
1385 struct x25_facilities facilities;
1386 rc = -EFAULT;
1387 if (copy_from_user(&facilities, argp,
1388 sizeof(facilities)))
1389 break;
1390 rc = -EINVAL;
1391 if (sk->sk_state != TCP_LISTEN &&
1392 sk->sk_state != TCP_CLOSE)
1393 break;
1394 if (facilities.pacsize_in < X25_PS16 ||
1395 facilities.pacsize_in > X25_PS4096)
1396 break;
1397 if (facilities.pacsize_out < X25_PS16 ||
1398 facilities.pacsize_out > X25_PS4096)
1399 break;
1400 if (facilities.winsize_in < 1 ||
1401 facilities.winsize_in > 127)
1402 break;
1403 if (facilities.throughput < 0x03 ||
1404 facilities.throughput > 0xDD)
1405 break;
1406 if (facilities.reverse &&
1407 (facilities.reverse & 0x81) != 0x81)
1408 break;
1409 x25->facilities = facilities;
1410 rc = 0;
1411 break;
1412 }
1413
1414 case SIOCX25GDTEFACILITIES: {
1415 rc = copy_to_user(argp, &x25->dte_facilities,
1416 sizeof(x25->dte_facilities));
1417 if (rc)
1418 rc = -EFAULT;
1419 break;
1420 }
1421
1422 case SIOCX25SDTEFACILITIES: {
1423 struct x25_dte_facilities dtefacs;
1424 rc = -EFAULT;
1425 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1426 break;
1427 rc = -EINVAL;
1428 if (sk->sk_state != TCP_LISTEN &&
1429 sk->sk_state != TCP_CLOSE)
1430 break;
1431 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1432 break;
1433 if (dtefacs.calling_ae == NULL)
1434 break;
1435 if (dtefacs.called_len > X25_MAX_AE_LEN)
1436 break;
1437 if (dtefacs.called_ae == NULL)
1438 break;
1439 x25->dte_facilities = dtefacs;
1440 rc = 0;
1441 break;
1442 }
1443
1444 case SIOCX25GCALLUSERDATA: {
1445 struct x25_calluserdata cud = x25->calluserdata;
1446 rc = copy_to_user(argp, &cud,
1447 sizeof(cud)) ? -EFAULT : 0;
1448 break;
1449 }
1450
1451 case SIOCX25SCALLUSERDATA: {
1452 struct x25_calluserdata calluserdata;
1453
1454 rc = -EFAULT;
1455 if (copy_from_user(&calluserdata, argp,
1456 sizeof(calluserdata)))
1457 break;
1458 rc = -EINVAL;
1459 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1460 break;
1461 x25->calluserdata = calluserdata;
1462 rc = 0;
1463 break;
1464 }
1465
1466 case SIOCX25GCAUSEDIAG: {
1467 struct x25_causediag causediag;
1468 causediag = x25->causediag;
1469 rc = copy_to_user(argp, &causediag,
1470 sizeof(causediag)) ? -EFAULT : 0;
1471 break;
1472 }
1473
1474 case SIOCX25SCAUSEDIAG: {
1475 struct x25_causediag causediag;
1476 rc = -EFAULT;
1477 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1478 break;
1479 x25->causediag = causediag;
1480 rc = 0;
1481 break;
1482
1483 }
1484
1485 case SIOCX25SCUDMATCHLEN: {
1486 struct x25_subaddr sub_addr;
1487 rc = -EINVAL;
1488 if(sk->sk_state != TCP_CLOSE)
1489 break;
1490 rc = -EFAULT;
1491 if (copy_from_user(&sub_addr, argp,
1492 sizeof(sub_addr)))
1493 break;
1494 rc = -EINVAL;
1495 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1496 break;
1497 x25->cudmatchlength = sub_addr.cudmatchlength;
1498 rc = 0;
1499 break;
1500 }
1501
1502 case SIOCX25CALLACCPTAPPRV: {
1503 rc = -EINVAL;
1504 if (sk->sk_state != TCP_CLOSE)
1505 break;
1506 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1507 rc = 0;
1508 break;
1509 }
1510
1511 case SIOCX25SENDCALLACCPT: {
1512 rc = -EINVAL;
1513 if (sk->sk_state != TCP_ESTABLISHED)
1514 break;
1515 if (x25->accptapprv) /* must call accptapprv above */
1516 break;
1517 x25_write_internal(sk, X25_CALL_ACCEPTED);
1518 x25->state = X25_STATE_3;
1519 rc = 0;
1520 break;
1521 }
1522
1523 default:
1524 rc = -ENOIOCTLCMD;
1525 break;
1526 }
1527 unlock_kernel();
1528
1529 return rc;
1530 }
1531
1532 static const struct net_proto_family x25_family_ops = {
1533 .family = AF_X25,
1534 .create = x25_create,
1535 .owner = THIS_MODULE,
1536 };
1537
1538 #ifdef CONFIG_COMPAT
1539 static int compat_x25_subscr_ioctl(unsigned int cmd,
1540 struct compat_x25_subscrip_struct __user *x25_subscr32)
1541 {
1542 struct compat_x25_subscrip_struct x25_subscr;
1543 struct x25_neigh *nb;
1544 struct net_device *dev;
1545 int rc = -EINVAL;
1546
1547 rc = -EFAULT;
1548 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1549 goto out;
1550
1551 rc = -EINVAL;
1552 dev = x25_dev_get(x25_subscr.device);
1553 if (dev == NULL)
1554 goto out;
1555
1556 nb = x25_get_neigh(dev);
1557 if (nb == NULL)
1558 goto out_dev_put;
1559
1560 dev_put(dev);
1561
1562 if (cmd == SIOCX25GSUBSCRIP) {
1563 x25_subscr.extended = nb->extended;
1564 x25_subscr.global_facil_mask = nb->global_facil_mask;
1565 rc = copy_to_user(x25_subscr32, &x25_subscr,
1566 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1567 } else {
1568 rc = -EINVAL;
1569 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1570 rc = 0;
1571 nb->extended = x25_subscr.extended;
1572 nb->global_facil_mask = x25_subscr.global_facil_mask;
1573 }
1574 }
1575 x25_neigh_put(nb);
1576 out:
1577 return rc;
1578 out_dev_put:
1579 dev_put(dev);
1580 goto out;
1581 }
1582
1583 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1584 unsigned long arg)
1585 {
1586 void __user *argp = compat_ptr(arg);
1587 struct sock *sk = sock->sk;
1588
1589 int rc = -ENOIOCTLCMD;
1590
1591 switch(cmd) {
1592 case TIOCOUTQ:
1593 case TIOCINQ:
1594 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1595 break;
1596 case SIOCGSTAMP:
1597 rc = -EINVAL;
1598 lock_kernel();
1599 if (sk)
1600 rc = compat_sock_get_timestamp(sk,
1601 (struct timeval __user*)argp);
1602 unlock_kernel();
1603 break;
1604 case SIOCGSTAMPNS:
1605 rc = -EINVAL;
1606 lock_kernel();
1607 if (sk)
1608 rc = compat_sock_get_timestampns(sk,
1609 (struct timespec __user*)argp);
1610 unlock_kernel();
1611 break;
1612 case SIOCGIFADDR:
1613 case SIOCSIFADDR:
1614 case SIOCGIFDSTADDR:
1615 case SIOCSIFDSTADDR:
1616 case SIOCGIFBRDADDR:
1617 case SIOCSIFBRDADDR:
1618 case SIOCGIFNETMASK:
1619 case SIOCSIFNETMASK:
1620 case SIOCGIFMETRIC:
1621 case SIOCSIFMETRIC:
1622 rc = -EINVAL;
1623 break;
1624 case SIOCADDRT:
1625 case SIOCDELRT:
1626 rc = -EPERM;
1627 if (!capable(CAP_NET_ADMIN))
1628 break;
1629 lock_kernel();
1630 rc = x25_route_ioctl(cmd, argp);
1631 unlock_kernel();
1632 break;
1633 case SIOCX25GSUBSCRIP:
1634 lock_kernel();
1635 rc = compat_x25_subscr_ioctl(cmd, argp);
1636 unlock_kernel();
1637 break;
1638 case SIOCX25SSUBSCRIP:
1639 rc = -EPERM;
1640 if (!capable(CAP_NET_ADMIN))
1641 break;
1642 lock_kernel();
1643 rc = compat_x25_subscr_ioctl(cmd, argp);
1644 unlock_kernel();
1645 break;
1646 case SIOCX25GFACILITIES:
1647 case SIOCX25SFACILITIES:
1648 case SIOCX25GDTEFACILITIES:
1649 case SIOCX25SDTEFACILITIES:
1650 case SIOCX25GCALLUSERDATA:
1651 case SIOCX25SCALLUSERDATA:
1652 case SIOCX25GCAUSEDIAG:
1653 case SIOCX25SCAUSEDIAG:
1654 case SIOCX25SCUDMATCHLEN:
1655 case SIOCX25CALLACCPTAPPRV:
1656 case SIOCX25SENDCALLACCPT:
1657 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1658 break;
1659 default:
1660 rc = -ENOIOCTLCMD;
1661 break;
1662 }
1663 return rc;
1664 }
1665 #endif
1666
1667 static const struct proto_ops x25_proto_ops = {
1668 .family = AF_X25,
1669 .owner = THIS_MODULE,
1670 .release = x25_release,
1671 .bind = x25_bind,
1672 .connect = x25_connect,
1673 .socketpair = sock_no_socketpair,
1674 .accept = x25_accept,
1675 .getname = x25_getname,
1676 .poll = x25_datagram_poll,
1677 .ioctl = x25_ioctl,
1678 #ifdef CONFIG_COMPAT
1679 .compat_ioctl = compat_x25_ioctl,
1680 #endif
1681 .listen = x25_listen,
1682 .shutdown = sock_no_shutdown,
1683 .setsockopt = x25_setsockopt,
1684 .getsockopt = x25_getsockopt,
1685 .sendmsg = x25_sendmsg,
1686 .recvmsg = x25_recvmsg,
1687 .mmap = sock_no_mmap,
1688 .sendpage = sock_no_sendpage,
1689 };
1690
1691 static struct packet_type x25_packet_type __read_mostly = {
1692 .type = cpu_to_be16(ETH_P_X25),
1693 .func = x25_lapb_receive_frame,
1694 };
1695
1696 static struct notifier_block x25_dev_notifier = {
1697 .notifier_call = x25_device_event,
1698 };
1699
1700 void x25_kill_by_neigh(struct x25_neigh *nb)
1701 {
1702 struct sock *s;
1703 struct hlist_node *node;
1704
1705 write_lock_bh(&x25_list_lock);
1706
1707 sk_for_each(s, node, &x25_list)
1708 if (x25_sk(s)->neighbour == nb)
1709 x25_disconnect(s, ENETUNREACH, 0, 0);
1710
1711 write_unlock_bh(&x25_list_lock);
1712
1713 /* Remove any related forwards */
1714 x25_clear_forward_by_dev(nb->dev);
1715 }
1716
1717 static int __init x25_init(void)
1718 {
1719 int rc = proto_register(&x25_proto, 0);
1720
1721 if (rc != 0)
1722 goto out;
1723
1724 rc = sock_register(&x25_family_ops);
1725 if (rc != 0)
1726 goto out_proto;
1727
1728 dev_add_pack(&x25_packet_type);
1729
1730 rc = register_netdevice_notifier(&x25_dev_notifier);
1731 if (rc != 0)
1732 goto out_sock;
1733
1734 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1735
1736 x25_register_sysctl();
1737 rc = x25_proc_init();
1738 if (rc != 0)
1739 goto out_dev;
1740 out:
1741 return rc;
1742 out_dev:
1743 unregister_netdevice_notifier(&x25_dev_notifier);
1744 out_sock:
1745 sock_unregister(AF_X25);
1746 out_proto:
1747 proto_unregister(&x25_proto);
1748 goto out;
1749 }
1750 module_init(x25_init);
1751
1752 static void __exit x25_exit(void)
1753 {
1754 x25_proc_exit();
1755 x25_link_free();
1756 x25_route_free();
1757
1758 x25_unregister_sysctl();
1759
1760 unregister_netdevice_notifier(&x25_dev_notifier);
1761
1762 dev_remove_pack(&x25_packet_type);
1763
1764 sock_unregister(AF_X25);
1765 proto_unregister(&x25_proto);
1766 }
1767 module_exit(x25_exit);
1768
1769 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1770 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1771 MODULE_LICENSE("GPL");
1772 MODULE_ALIAS_NETPROTO(PF_X25);
CRIS linux kernel tree