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[XFRM]: Purge dst references to deleted SAs passively.
[linux-2.6/sactl.git] / net / x25 / af_x25.c
blob52a2726d327fe68f6c7ea003894902b204f25e99
1 /*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
7 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 * X.25 002 Jonathan Naylor Centralised disconnect handling.
19 * New timer architecture.
20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
26 * Fixed x25_output() related skb leakage.
27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31 * x25_proc.c, using seq_file
32 * 2005-04-02 Shaun Pereira Selective sub address matching
33 * with call user data
34 * 2005-04-15 Shaun Pereira Fast select with no restriction on
35 * response
36 */
37
38 #include <linux/module.h>
39 #include <linux/capability.h>
40 #include <linux/errno.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/timer.h>
44 #include <linux/string.h>
45 #include <linux/net.h>
46 #include <linux/netdevice.h>
47 #include <linux/if_arp.h>
48 #include <linux/skbuff.h>
49 #include <net/sock.h>
50 #include <net/tcp_states.h>
51 #include <asm/uaccess.h>
52 #include <linux/fcntl.h>
53 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
54 #include <linux/notifier.h>
55 #include <linux/init.h>
56 #include <linux/compat.h>
57
58 #include <net/x25.h>
59 #include <net/compat.h>
60
61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
62 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
63 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
64 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
65 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
66
67 HLIST_HEAD(x25_list);
68 DEFINE_RWLOCK(x25_list_lock);
69
70 static const struct proto_ops x25_proto_ops;
71
72 static struct x25_address null_x25_address = {" "};
73
74 #ifdef CONFIG_COMPAT
75 struct compat_x25_subscrip_struct {
76 char device[200-sizeof(compat_ulong_t)];
77 compat_ulong_t global_facil_mask;
78 compat_uint_t extended;
79 };
80 #endif
81
82 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
83 struct x25_address *calling_addr)
84 {
85 int called_len, calling_len;
86 char *called, *calling;
87 int i;
88
89 called_len = (*p >> 0) & 0x0F;
90 calling_len = (*p >> 4) & 0x0F;
91
92 called = called_addr->x25_addr;
93 calling = calling_addr->x25_addr;
94 p++;
95
96 for (i = 0; i < (called_len + calling_len); i++) {
97 if (i < called_len) {
98 if (i % 2 != 0) {
99 *called++ = ((*p >> 0) & 0x0F) + '0';
100 p++;
101 } else {
102 *called++ = ((*p >> 4) & 0x0F) + '0';
103 }
104 } else {
105 if (i % 2 != 0) {
106 *calling++ = ((*p >> 0) & 0x0F) + '0';
107 p++;
108 } else {
109 *calling++ = ((*p >> 4) & 0x0F) + '0';
110 }
111 }
112 }
113
114 *called = *calling = '\0';
115
116 return 1 + (called_len + calling_len + 1) / 2;
117 }
118
119 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
120 struct x25_address *calling_addr)
121 {
122 unsigned int called_len, calling_len;
123 char *called, *calling;
124 int i;
125
126 called = called_addr->x25_addr;
127 calling = calling_addr->x25_addr;
128
129 called_len = strlen(called);
130 calling_len = strlen(calling);
131
132 *p++ = (calling_len << 4) | (called_len << 0);
133
134 for (i = 0; i < (called_len + calling_len); i++) {
135 if (i < called_len) {
136 if (i % 2 != 0) {
137 *p |= (*called++ - '0') << 0;
138 p++;
139 } else {
140 *p = 0x00;
141 *p |= (*called++ - '0') << 4;
142 }
143 } else {
144 if (i % 2 != 0) {
145 *p |= (*calling++ - '0') << 0;
146 p++;
147 } else {
148 *p = 0x00;
149 *p |= (*calling++ - '0') << 4;
150 }
151 }
152 }
153
154 return 1 + (called_len + calling_len + 1) / 2;
155 }
156
157 /*
158 * Socket removal during an interrupt is now safe.
159 */
160 static void x25_remove_socket(struct sock *sk)
161 {
162 write_lock_bh(&x25_list_lock);
163 sk_del_node_init(sk);
164 write_unlock_bh(&x25_list_lock);
165 }
166
167 /*
168 * Kill all bound sockets on a dropped device.
169 */
170 static void x25_kill_by_device(struct net_device *dev)
171 {
172 struct sock *s;
173 struct hlist_node *node;
174
175 write_lock_bh(&x25_list_lock);
176
177 sk_for_each(s, node, &x25_list)
178 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
179 x25_disconnect(s, ENETUNREACH, 0, 0);
180
181 write_unlock_bh(&x25_list_lock);
182 }
183
184 /*
185 * Handle device status changes.
186 */
187 static int x25_device_event(struct notifier_block *this, unsigned long event,
188 void *ptr)
189 {
190 struct net_device *dev = ptr;
191 struct x25_neigh *nb;
192
193 if (dev->type == ARPHRD_X25
194 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
195 || dev->type == ARPHRD_ETHER
196 #endif
197 ) {
198 switch (event) {
199 case NETDEV_UP:
200 x25_link_device_up(dev);
201 break;
202 case NETDEV_GOING_DOWN:
203 nb = x25_get_neigh(dev);
204 if (nb) {
205 x25_terminate_link(nb);
206 x25_neigh_put(nb);
207 }
208 break;
209 case NETDEV_DOWN:
210 x25_kill_by_device(dev);
211 x25_route_device_down(dev);
212 x25_link_device_down(dev);
213 break;
214 }
215 }
216
217 return NOTIFY_DONE;
218 }
219
220 /*
221 * Add a socket to the bound sockets list.
222 */
223 static void x25_insert_socket(struct sock *sk)
224 {
225 write_lock_bh(&x25_list_lock);
226 sk_add_node(sk, &x25_list);
227 write_unlock_bh(&x25_list_lock);
228 }
229
230 /*
231 * Find a socket that wants to accept the Call Request we just
232 * received. Check the full list for an address/cud match.
233 * If no cuds match return the next_best thing, an address match.
234 * Note: if a listening socket has cud set it must only get calls
235 * with matching cud.
236 */
237 static struct sock *x25_find_listener(struct x25_address *addr,
238 struct sk_buff *skb)
239 {
240 struct sock *s;
241 struct sock *next_best;
242 struct hlist_node *node;
243
244 read_lock_bh(&x25_list_lock);
245 next_best = NULL;
246
247 sk_for_each(s, node, &x25_list)
248 if ((!strcmp(addr->x25_addr,
249 x25_sk(s)->source_addr.x25_addr) ||
250 !strcmp(addr->x25_addr,
251 null_x25_address.x25_addr)) &&
252 s->sk_state == TCP_LISTEN) {
253 /*
254 * Found a listening socket, now check the incoming
255 * call user data vs this sockets call user data
256 */
257 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
258 if((memcmp(x25_sk(s)->calluserdata.cuddata,
259 skb->data,
260 x25_sk(s)->cudmatchlength)) == 0) {
261 sock_hold(s);
262 goto found;
263 }
264 } else
265 next_best = s;
266 }
267 if (next_best) {
268 s = next_best;
269 sock_hold(s);
270 goto found;
271 }
272 s = NULL;
273 found:
274 read_unlock_bh(&x25_list_lock);
275 return s;
276 }
277
278 /*
279 * Find a connected X.25 socket given my LCI and neighbour.
280 */
281 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
282 {
283 struct sock *s;
284 struct hlist_node *node;
285
286 sk_for_each(s, node, &x25_list)
287 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
288 sock_hold(s);
289 goto found;
290 }
291 s = NULL;
292 found:
293 return s;
294 }
295
296 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
297 {
298 struct sock *s;
299
300 read_lock_bh(&x25_list_lock);
301 s = __x25_find_socket(lci, nb);
302 read_unlock_bh(&x25_list_lock);
303 return s;
304 }
305
306 /*
307 * Find a unique LCI for a given device.
308 */
309 static unsigned int x25_new_lci(struct x25_neigh *nb)
310 {
311 unsigned int lci = 1;
312 struct sock *sk;
313
314 read_lock_bh(&x25_list_lock);
315
316 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
317 sock_put(sk);
318 if (++lci == 4096) {
319 lci = 0;
320 break;
321 }
322 }
323
324 read_unlock_bh(&x25_list_lock);
325 return lci;
326 }
327
328 /*
329 * Deferred destroy.
330 */
331 void x25_destroy_socket(struct sock *);
332
333 /*
334 * handler for deferred kills.
335 */
336 static void x25_destroy_timer(unsigned long data)
337 {
338 x25_destroy_socket((struct sock *)data);
339 }
340
341 /*
342 * This is called from user mode and the timers. Thus it protects itself
343 * against interrupt users but doesn't worry about being called during
344 * work. Once it is removed from the queue no interrupt or bottom half
345 * will touch it and we are (fairly 8-) ) safe.
346 * Not static as it's used by the timer
347 */
348 void x25_destroy_socket(struct sock *sk)
349 {
350 struct sk_buff *skb;
351
352 sock_hold(sk);
353 lock_sock(sk);
354 x25_stop_heartbeat(sk);
355 x25_stop_timer(sk);
356
357 x25_remove_socket(sk);
358 x25_clear_queues(sk); /* Flush the queues */
359
360 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
361 if (skb->sk != sk) { /* A pending connection */
362 /*
363 * Queue the unaccepted socket for death
364 */
365 sock_set_flag(skb->sk, SOCK_DEAD);
366 x25_start_heartbeat(skb->sk);
367 x25_sk(skb->sk)->state = X25_STATE_0;
368 }
369
370 kfree_skb(skb);
371 }
372
373 if (atomic_read(&sk->sk_wmem_alloc) ||
374 atomic_read(&sk->sk_rmem_alloc)) {
375 /* Defer: outstanding buffers */
376 sk->sk_timer.expires = jiffies + 10 * HZ;
377 sk->sk_timer.function = x25_destroy_timer;
378 sk->sk_timer.data = (unsigned long)sk;
379 add_timer(&sk->sk_timer);
380 } else {
381 /* drop last reference so sock_put will free */
382 __sock_put(sk);
383 }
384
385 release_sock(sk);
386 sock_put(sk);
387 }
388
389 /*
390 * Handling for system calls applied via the various interfaces to a
391 * X.25 socket object.
392 */
393
394 static int x25_setsockopt(struct socket *sock, int level, int optname,
395 char __user *optval, int optlen)
396 {
397 int opt;
398 struct sock *sk = sock->sk;
399 int rc = -ENOPROTOOPT;
400
401 if (level != SOL_X25 || optname != X25_QBITINCL)
402 goto out;
403
404 rc = -EINVAL;
405 if (optlen < sizeof(int))
406 goto out;
407
408 rc = -EFAULT;
409 if (get_user(opt, (int __user *)optval))
410 goto out;
411
412 x25_sk(sk)->qbitincl = !!opt;
413 rc = 0;
414 out:
415 return rc;
416 }
417
418 static int x25_getsockopt(struct socket *sock, int level, int optname,
419 char __user *optval, int __user *optlen)
420 {
421 struct sock *sk = sock->sk;
422 int val, len, rc = -ENOPROTOOPT;
423
424 if (level != SOL_X25 || optname != X25_QBITINCL)
425 goto out;
426
427 rc = -EFAULT;
428 if (get_user(len, optlen))
429 goto out;
430
431 len = min_t(unsigned int, len, sizeof(int));
432
433 rc = -EINVAL;
434 if (len < 0)
435 goto out;
436
437 rc = -EFAULT;
438 if (put_user(len, optlen))
439 goto out;
440
441 val = x25_sk(sk)->qbitincl;
442 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
443 out:
444 return rc;
445 }
446
447 static int x25_listen(struct socket *sock, int backlog)
448 {
449 struct sock *sk = sock->sk;
450 int rc = -EOPNOTSUPP;
451
452 if (sk->sk_state != TCP_LISTEN) {
453 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
454 sk->sk_max_ack_backlog = backlog;
455 sk->sk_state = TCP_LISTEN;
456 rc = 0;
457 }
458
459 return rc;
460 }
461
462 static struct proto x25_proto = {
463 .name = "X25",
464 .owner = THIS_MODULE,
465 .obj_size = sizeof(struct x25_sock),
466 };
467
468 static struct sock *x25_alloc_socket(void)
469 {
470 struct x25_sock *x25;
471 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
472
473 if (!sk)
474 goto out;
475
476 sock_init_data(NULL, sk);
477
478 x25 = x25_sk(sk);
479 skb_queue_head_init(&x25->ack_queue);
480 skb_queue_head_init(&x25->fragment_queue);
481 skb_queue_head_init(&x25->interrupt_in_queue);
482 skb_queue_head_init(&x25->interrupt_out_queue);
483 out:
484 return sk;
485 }
486
487 void x25_init_timers(struct sock *sk);
488
489 static int x25_create(struct socket *sock, int protocol)
490 {
491 struct sock *sk;
492 struct x25_sock *x25;
493 int rc = -ESOCKTNOSUPPORT;
494
495 if (sock->type != SOCK_SEQPACKET || protocol)
496 goto out;
497
498 rc = -ENOMEM;
499 if ((sk = x25_alloc_socket()) == NULL)
500 goto out;
501
502 x25 = x25_sk(sk);
503
504 sock_init_data(sock, sk);
505
506 x25_init_timers(sk);
507
508 sock->ops = &x25_proto_ops;
509 sk->sk_protocol = protocol;
510 sk->sk_backlog_rcv = x25_backlog_rcv;
511
512 x25->t21 = sysctl_x25_call_request_timeout;
513 x25->t22 = sysctl_x25_reset_request_timeout;
514 x25->t23 = sysctl_x25_clear_request_timeout;
515 x25->t2 = sysctl_x25_ack_holdback_timeout;
516 x25->state = X25_STATE_0;
517 x25->cudmatchlength = 0;
518 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
519 /* on call accept */
520
521 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
522 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
523 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
524 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
525 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
526 x25->facilities.reverse = X25_DEFAULT_REVERSE;
527 x25->dte_facilities.calling_len = 0;
528 x25->dte_facilities.called_len = 0;
529 memset(x25->dte_facilities.called_ae, '\0',
530 sizeof(x25->dte_facilities.called_ae));
531 memset(x25->dte_facilities.calling_ae, '\0',
532 sizeof(x25->dte_facilities.calling_ae));
533
534 rc = 0;
535 out:
536 return rc;
537 }
538
539 static struct sock *x25_make_new(struct sock *osk)
540 {
541 struct sock *sk = NULL;
542 struct x25_sock *x25, *ox25;
543
544 if (osk->sk_type != SOCK_SEQPACKET)
545 goto out;
546
547 if ((sk = x25_alloc_socket()) == NULL)
548 goto out;
549
550 x25 = x25_sk(sk);
551
552 sk->sk_type = osk->sk_type;
553 sk->sk_socket = osk->sk_socket;
554 sk->sk_priority = osk->sk_priority;
555 sk->sk_protocol = osk->sk_protocol;
556 sk->sk_rcvbuf = osk->sk_rcvbuf;
557 sk->sk_sndbuf = osk->sk_sndbuf;
558 sk->sk_state = TCP_ESTABLISHED;
559 sk->sk_sleep = osk->sk_sleep;
560 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
561 sock_copy_flags(sk, osk);
562
563 ox25 = x25_sk(osk);
564 x25->t21 = ox25->t21;
565 x25->t22 = ox25->t22;
566 x25->t23 = ox25->t23;
567 x25->t2 = ox25->t2;
568 x25->facilities = ox25->facilities;
569 x25->qbitincl = ox25->qbitincl;
570 x25->dte_facilities = ox25->dte_facilities;
571 x25->cudmatchlength = ox25->cudmatchlength;
572 x25->accptapprv = ox25->accptapprv;
573
574 x25_init_timers(sk);
575 out:
576 return sk;
577 }
578
579 static int x25_release(struct socket *sock)
580 {
581 struct sock *sk = sock->sk;
582 struct x25_sock *x25;
583
584 if (!sk)
585 goto out;
586
587 x25 = x25_sk(sk);
588
589 switch (x25->state) {
590
591 case X25_STATE_0:
592 case X25_STATE_2:
593 x25_disconnect(sk, 0, 0, 0);
594 x25_destroy_socket(sk);
595 goto out;
596
597 case X25_STATE_1:
598 case X25_STATE_3:
599 case X25_STATE_4:
600 x25_clear_queues(sk);
601 x25_write_internal(sk, X25_CLEAR_REQUEST);
602 x25_start_t23timer(sk);
603 x25->state = X25_STATE_2;
604 sk->sk_state = TCP_CLOSE;
605 sk->sk_shutdown |= SEND_SHUTDOWN;
606 sk->sk_state_change(sk);
607 sock_set_flag(sk, SOCK_DEAD);
608 sock_set_flag(sk, SOCK_DESTROY);
609 break;
610 }
611
612 sock->sk = NULL;
613 sk->sk_socket = NULL; /* Not used, but we should do this */
614 out:
615 return 0;
616 }
617
618 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
619 {
620 struct sock *sk = sock->sk;
621 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
622
623 if (!sock_flag(sk, SOCK_ZAPPED) ||
624 addr_len != sizeof(struct sockaddr_x25) ||
625 addr->sx25_family != AF_X25)
626 return -EINVAL;
627
628 x25_sk(sk)->source_addr = addr->sx25_addr;
629 x25_insert_socket(sk);
630 sock_reset_flag(sk, SOCK_ZAPPED);
631 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
632
633 return 0;
634 }
635
636 static int x25_wait_for_connection_establishment(struct sock *sk)
637 {
638 DECLARE_WAITQUEUE(wait, current);
639 int rc;
640
641 add_wait_queue_exclusive(sk->sk_sleep, &wait);
642 for (;;) {
643 __set_current_state(TASK_INTERRUPTIBLE);
644 rc = -ERESTARTSYS;
645 if (signal_pending(current))
646 break;
647 rc = sock_error(sk);
648 if (rc) {
649 sk->sk_socket->state = SS_UNCONNECTED;
650 break;
651 }
652 rc = 0;
653 if (sk->sk_state != TCP_ESTABLISHED) {
654 release_sock(sk);
655 schedule();
656 lock_sock(sk);
657 } else
658 break;
659 }
660 __set_current_state(TASK_RUNNING);
661 remove_wait_queue(sk->sk_sleep, &wait);
662 return rc;
663 }
664
665 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
666 int addr_len, int flags)
667 {
668 struct sock *sk = sock->sk;
669 struct x25_sock *x25 = x25_sk(sk);
670 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
671 struct x25_route *rt;
672 int rc = 0;
673
674 lock_sock(sk);
675 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
676 sock->state = SS_CONNECTED;
677 goto out; /* Connect completed during a ERESTARTSYS event */
678 }
679
680 rc = -ECONNREFUSED;
681 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
682 sock->state = SS_UNCONNECTED;
683 goto out;
684 }
685
686 rc = -EISCONN; /* No reconnect on a seqpacket socket */
687 if (sk->sk_state == TCP_ESTABLISHED)
688 goto out;
689
690 sk->sk_state = TCP_CLOSE;
691 sock->state = SS_UNCONNECTED;
692
693 rc = -EINVAL;
694 if (addr_len != sizeof(struct sockaddr_x25) ||
695 addr->sx25_family != AF_X25)
696 goto out;
697
698 rc = -ENETUNREACH;
699 rt = x25_get_route(&addr->sx25_addr);
700 if (!rt)
701 goto out;
702
703 x25->neighbour = x25_get_neigh(rt->dev);
704 if (!x25->neighbour)
705 goto out_put_route;
706
707 x25_limit_facilities(&x25->facilities, x25->neighbour);
708
709 x25->lci = x25_new_lci(x25->neighbour);
710 if (!x25->lci)
711 goto out_put_neigh;
712
713 rc = -EINVAL;
714 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
715 goto out_put_neigh;
716
717 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
718 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
719
720 x25->dest_addr = addr->sx25_addr;
721
722 /* Move to connecting socket, start sending Connect Requests */
723 sock->state = SS_CONNECTING;
724 sk->sk_state = TCP_SYN_SENT;
725
726 x25->state = X25_STATE_1;
727
728 x25_write_internal(sk, X25_CALL_REQUEST);
729
730 x25_start_heartbeat(sk);
731 x25_start_t21timer(sk);
732
733 /* Now the loop */
734 rc = -EINPROGRESS;
735 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
736 goto out_put_neigh;
737
738 rc = x25_wait_for_connection_establishment(sk);
739 if (rc)
740 goto out_put_neigh;
741
742 sock->state = SS_CONNECTED;
743 rc = 0;
744 out_put_neigh:
745 if (rc)
746 x25_neigh_put(x25->neighbour);
747 out_put_route:
748 x25_route_put(rt);
749 out:
750 release_sock(sk);
751 return rc;
752 }
753
754 static int x25_wait_for_data(struct sock *sk, long timeout)
755 {
756 DECLARE_WAITQUEUE(wait, current);
757 int rc = 0;
758
759 add_wait_queue_exclusive(sk->sk_sleep, &wait);
760 for (;;) {
761 __set_current_state(TASK_INTERRUPTIBLE);
762 if (sk->sk_shutdown & RCV_SHUTDOWN)
763 break;
764 rc = -ERESTARTSYS;
765 if (signal_pending(current))
766 break;
767 rc = -EAGAIN;
768 if (!timeout)
769 break;
770 rc = 0;
771 if (skb_queue_empty(&sk->sk_receive_queue)) {
772 release_sock(sk);
773 timeout = schedule_timeout(timeout);
774 lock_sock(sk);
775 } else
776 break;
777 }
778 __set_current_state(TASK_RUNNING);
779 remove_wait_queue(sk->sk_sleep, &wait);
780 return rc;
781 }
782
783 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
784 {
785 struct sock *sk = sock->sk;
786 struct sock *newsk;
787 struct sk_buff *skb;
788 int rc = -EINVAL;
789
790 if (!sk || sk->sk_state != TCP_LISTEN)
791 goto out;
792
793 rc = -EOPNOTSUPP;
794 if (sk->sk_type != SOCK_SEQPACKET)
795 goto out;
796
797 lock_sock(sk);
798 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
799 if (rc)
800 goto out2;
801 skb = skb_dequeue(&sk->sk_receive_queue);
802 rc = -EINVAL;
803 if (!skb->sk)
804 goto out2;
805 newsk = skb->sk;
806 newsk->sk_socket = newsock;
807 newsk->sk_sleep = &newsock->wait;
808
809 /* Now attach up the new socket */
810 skb->sk = NULL;
811 kfree_skb(skb);
812 sk->sk_ack_backlog--;
813 newsock->sk = newsk;
814 newsock->state = SS_CONNECTED;
815 rc = 0;
816 out2:
817 release_sock(sk);
818 out:
819 return rc;
820 }
821
822 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
823 int *uaddr_len, int peer)
824 {
825 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
826 struct sock *sk = sock->sk;
827 struct x25_sock *x25 = x25_sk(sk);
828
829 if (peer) {
830 if (sk->sk_state != TCP_ESTABLISHED)
831 return -ENOTCONN;
832 sx25->sx25_addr = x25->dest_addr;
833 } else
834 sx25->sx25_addr = x25->source_addr;
835
836 sx25->sx25_family = AF_X25;
837 *uaddr_len = sizeof(*sx25);
838
839 return 0;
840 }
841
842 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
843 unsigned int lci)
844 {
845 struct sock *sk;
846 struct sock *make;
847 struct x25_sock *makex25;
848 struct x25_address source_addr, dest_addr;
849 struct x25_facilities facilities;
850 struct x25_dte_facilities dte_facilities;
851 int len, rc;
852
853 /*
854 * Remove the LCI and frame type.
855 */
856 skb_pull(skb, X25_STD_MIN_LEN);
857
858 /*
859 * Extract the X.25 addresses and convert them to ASCII strings,
860 * and remove them.
861 */
862 skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
863
864 /*
865 * Get the length of the facilities, skip past them for the moment
866 * get the call user data because this is needed to determine
867 * the correct listener
868 */
869 len = skb->data[0] + 1;
870 skb_pull(skb,len);
871
872 /*
873 * Find a listener for the particular address/cud pair.
874 */
875 sk = x25_find_listener(&source_addr,skb);
876 skb_push(skb,len);
877
878 /*
879 * We can't accept the Call Request.
880 */
881 if (sk == NULL || sk_acceptq_is_full(sk))
882 goto out_clear_request;
883
884 /*
885 * Try to reach a compromise on the requested facilities.
886 */
887 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
888 if (len == -1)
889 goto out_sock_put;
890
891 /*
892 * current neighbour/link might impose additional limits
893 * on certain facilties
894 */
895
896 x25_limit_facilities(&facilities, nb);
897
898 /*
899 * Try to create a new socket.
900 */
901 make = x25_make_new(sk);
902 if (!make)
903 goto out_sock_put;
904
905 /*
906 * Remove the facilities
907 */
908 skb_pull(skb, len);
909
910 skb->sk = make;
911 make->sk_state = TCP_ESTABLISHED;
912
913 makex25 = x25_sk(make);
914 makex25->lci = lci;
915 makex25->dest_addr = dest_addr;
916 makex25->source_addr = source_addr;
917 makex25->neighbour = nb;
918 makex25->facilities = facilities;
919 makex25->dte_facilities= dte_facilities;
920 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
921 /* ensure no reverse facil on accept */
922 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
923 /* ensure no calling address extension on accept */
924 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
925 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
926
927 /* Normally all calls are accepted immediatly */
928 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
929 x25_write_internal(make, X25_CALL_ACCEPTED);
930 makex25->state = X25_STATE_3;
931 }
932
933 /*
934 * Incoming Call User Data.
935 */
936 if (skb->len >= 0) {
937 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
938 makex25->calluserdata.cudlength = skb->len;
939 }
940
941 sk->sk_ack_backlog++;
942
943 x25_insert_socket(make);
944
945 skb_queue_head(&sk->sk_receive_queue, skb);
946
947 x25_start_heartbeat(make);
948
949 if (!sock_flag(sk, SOCK_DEAD))
950 sk->sk_data_ready(sk, skb->len);
951 rc = 1;
952 sock_put(sk);
953 out:
954 return rc;
955 out_sock_put:
956 sock_put(sk);
957 out_clear_request:
958 rc = 0;
959 x25_transmit_clear_request(nb, lci, 0x01);
960 goto out;
961 }
962
963 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
964 struct msghdr *msg, size_t len)
965 {
966 struct sock *sk = sock->sk;
967 struct x25_sock *x25 = x25_sk(sk);
968 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
969 struct sockaddr_x25 sx25;
970 struct sk_buff *skb;
971 unsigned char *asmptr;
972 int noblock = msg->msg_flags & MSG_DONTWAIT;
973 size_t size;
974 int qbit = 0, rc = -EINVAL;
975
976 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
977 goto out;
978
979 /* we currently don't support segmented records at the user interface */
980 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
981 goto out;
982
983 rc = -EADDRNOTAVAIL;
984 if (sock_flag(sk, SOCK_ZAPPED))
985 goto out;
986
987 rc = -EPIPE;
988 if (sk->sk_shutdown & SEND_SHUTDOWN) {
989 send_sig(SIGPIPE, current, 0);
990 goto out;
991 }
992
993 rc = -ENETUNREACH;
994 if (!x25->neighbour)
995 goto out;
996
997 if (usx25) {
998 rc = -EINVAL;
999 if (msg->msg_namelen < sizeof(sx25))
1000 goto out;
1001 memcpy(&sx25, usx25, sizeof(sx25));
1002 rc = -EISCONN;
1003 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1004 goto out;
1005 rc = -EINVAL;
1006 if (sx25.sx25_family != AF_X25)
1007 goto out;
1008 } else {
1009 /*
1010 * FIXME 1003.1g - if the socket is like this because
1011 * it has become closed (not started closed) we ought
1012 * to SIGPIPE, EPIPE;
1013 */
1014 rc = -ENOTCONN;
1015 if (sk->sk_state != TCP_ESTABLISHED)
1016 goto out;
1017
1018 sx25.sx25_family = AF_X25;
1019 sx25.sx25_addr = x25->dest_addr;
1020 }
1021
1022 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1023
1024 /* Build a packet */
1025 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1026
1027 if ((msg->msg_flags & MSG_OOB) && len > 32)
1028 len = 32;
1029
1030 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1031
1032 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1033 if (!skb)
1034 goto out;
1035 X25_SKB_CB(skb)->flags = msg->msg_flags;
1036
1037 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1038
1039 /*
1040 * Put the data on the end
1041 */
1042 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1043
1044 asmptr = skb->h.raw = skb_put(skb, len);
1045
1046 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1047 if (rc)
1048 goto out_kfree_skb;
1049
1050 /*
1051 * If the Q BIT Include socket option is in force, the first
1052 * byte of the user data is the logical value of the Q Bit.
1053 */
1054 if (x25->qbitincl) {
1055 qbit = skb->data[0];
1056 skb_pull(skb, 1);
1057 }
1058
1059 /*
1060 * Push down the X.25 header
1061 */
1062 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1063
1064 if (msg->msg_flags & MSG_OOB) {
1065 if (x25->neighbour->extended) {
1066 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1067 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1068 *asmptr++ = (x25->lci >> 0) & 0xFF;
1069 *asmptr++ = X25_INTERRUPT;
1070 } else {
1071 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1072 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1073 *asmptr++ = (x25->lci >> 0) & 0xFF;
1074 *asmptr++ = X25_INTERRUPT;
1075 }
1076 } else {
1077 if (x25->neighbour->extended) {
1078 /* Build an Extended X.25 header */
1079 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1080 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1081 *asmptr++ = (x25->lci >> 0) & 0xFF;
1082 *asmptr++ = X25_DATA;
1083 *asmptr++ = X25_DATA;
1084 } else {
1085 /* Build an Standard X.25 header */
1086 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1087 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1088 *asmptr++ = (x25->lci >> 0) & 0xFF;
1089 *asmptr++ = X25_DATA;
1090 }
1091
1092 if (qbit)
1093 skb->data[0] |= X25_Q_BIT;
1094 }
1095
1096 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1097 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1098
1099 rc = -ENOTCONN;
1100 if (sk->sk_state != TCP_ESTABLISHED)
1101 goto out_kfree_skb;
1102
1103 if (msg->msg_flags & MSG_OOB)
1104 skb_queue_tail(&x25->interrupt_out_queue, skb);
1105 else {
1106 len = x25_output(sk, skb);
1107 if (len < 0)
1108 kfree_skb(skb);
1109 else if (x25->qbitincl)
1110 len++;
1111 }
1112
1113 /*
1114 * lock_sock() is currently only used to serialize this x25_kick()
1115 * against input-driven x25_kick() calls. It currently only blocks
1116 * incoming packets for this socket and does not protect against
1117 * any other socket state changes and is not called from anywhere
1118 * else. As x25_kick() cannot block and as long as all socket
1119 * operations are BKL-wrapped, we don't need take to care about
1120 * purging the backlog queue in x25_release().
1121 *
1122 * Using lock_sock() to protect all socket operations entirely
1123 * (and making the whole x25 stack SMP aware) unfortunately would
1124 * require major changes to {send,recv}msg and skb allocation methods.
1125 * -> 2.5 ;)
1126 */
1127 lock_sock(sk);
1128 x25_kick(sk);
1129 release_sock(sk);
1130 rc = len;
1131 out:
1132 return rc;
1133 out_kfree_skb:
1134 kfree_skb(skb);
1135 goto out;
1136 }
1137
1138
1139 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1140 struct msghdr *msg, size_t size,
1141 int flags)
1142 {
1143 struct sock *sk = sock->sk;
1144 struct x25_sock *x25 = x25_sk(sk);
1145 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1146 size_t copied;
1147 int qbit;
1148 struct sk_buff *skb;
1149 unsigned char *asmptr;
1150 int rc = -ENOTCONN;
1151
1152 /*
1153 * This works for seqpacket too. The receiver has ordered the queue for
1154 * us! We do one quick check first though
1155 */
1156 if (sk->sk_state != TCP_ESTABLISHED)
1157 goto out;
1158
1159 if (flags & MSG_OOB) {
1160 rc = -EINVAL;
1161 if (sock_flag(sk, SOCK_URGINLINE) ||
1162 !skb_peek(&x25->interrupt_in_queue))
1163 goto out;
1164
1165 skb = skb_dequeue(&x25->interrupt_in_queue);
1166
1167 skb_pull(skb, X25_STD_MIN_LEN);
1168
1169 /*
1170 * No Q bit information on Interrupt data.
1171 */
1172 if (x25->qbitincl) {
1173 asmptr = skb_push(skb, 1);
1174 *asmptr = 0x00;
1175 }
1176
1177 msg->msg_flags |= MSG_OOB;
1178 } else {
1179 /* Now we can treat all alike */
1180 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1181 flags & MSG_DONTWAIT, &rc);
1182 if (!skb)
1183 goto out;
1184
1185 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1186
1187 skb_pull(skb, x25->neighbour->extended ?
1188 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1189
1190 if (x25->qbitincl) {
1191 asmptr = skb_push(skb, 1);
1192 *asmptr = qbit;
1193 }
1194 }
1195
1196 skb->h.raw = skb->data;
1197
1198 copied = skb->len;
1199
1200 if (copied > size) {
1201 copied = size;
1202 msg->msg_flags |= MSG_TRUNC;
1203 }
1204
1205 /* Currently, each datagram always contains a complete record */
1206 msg->msg_flags |= MSG_EOR;
1207
1208 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1209 if (rc)
1210 goto out_free_dgram;
1211
1212 if (sx25) {
1213 sx25->sx25_family = AF_X25;
1214 sx25->sx25_addr = x25->dest_addr;
1215 }
1216
1217 msg->msg_namelen = sizeof(struct sockaddr_x25);
1218
1219 lock_sock(sk);
1220 x25_check_rbuf(sk);
1221 release_sock(sk);
1222 rc = copied;
1223 out_free_dgram:
1224 skb_free_datagram(sk, skb);
1225 out:
1226 return rc;
1227 }
1228
1229
1230 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1231 {
1232 struct sock *sk = sock->sk;
1233 struct x25_sock *x25 = x25_sk(sk);
1234 void __user *argp = (void __user *)arg;
1235 int rc;
1236
1237 switch (cmd) {
1238 case TIOCOUTQ: {
1239 int amount = sk->sk_sndbuf -
1240 atomic_read(&sk->sk_wmem_alloc);
1241 if (amount < 0)
1242 amount = 0;
1243 rc = put_user(amount, (unsigned int __user *)argp);
1244 break;
1245 }
1246
1247 case TIOCINQ: {
1248 struct sk_buff *skb;
1249 int amount = 0;
1250 /*
1251 * These two are safe on a single CPU system as
1252 * only user tasks fiddle here
1253 */
1254 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1255 amount = skb->len;
1256 rc = put_user(amount, (unsigned int __user *)argp);
1257 break;
1258 }
1259
1260 case SIOCGSTAMP:
1261 rc = -EINVAL;
1262 if (sk)
1263 rc = sock_get_timestamp(sk,
1264 (struct timeval __user *)argp);
1265 break;
1266 case SIOCGIFADDR:
1267 case SIOCSIFADDR:
1268 case SIOCGIFDSTADDR:
1269 case SIOCSIFDSTADDR:
1270 case SIOCGIFBRDADDR:
1271 case SIOCSIFBRDADDR:
1272 case SIOCGIFNETMASK:
1273 case SIOCSIFNETMASK:
1274 case SIOCGIFMETRIC:
1275 case SIOCSIFMETRIC:
1276 rc = -EINVAL;
1277 break;
1278 case SIOCADDRT:
1279 case SIOCDELRT:
1280 rc = -EPERM;
1281 if (!capable(CAP_NET_ADMIN))
1282 break;
1283 rc = x25_route_ioctl(cmd, argp);
1284 break;
1285 case SIOCX25GSUBSCRIP:
1286 rc = x25_subscr_ioctl(cmd, argp);
1287 break;
1288 case SIOCX25SSUBSCRIP:
1289 rc = -EPERM;
1290 if (!capable(CAP_NET_ADMIN))
1291 break;
1292 rc = x25_subscr_ioctl(cmd, argp);
1293 break;
1294 case SIOCX25GFACILITIES: {
1295 struct x25_facilities fac = x25->facilities;
1296 rc = copy_to_user(argp, &fac,
1297 sizeof(fac)) ? -EFAULT : 0;
1298 break;
1299 }
1300
1301 case SIOCX25SFACILITIES: {
1302 struct x25_facilities facilities;
1303 rc = -EFAULT;
1304 if (copy_from_user(&facilities, argp,
1305 sizeof(facilities)))
1306 break;
1307 rc = -EINVAL;
1308 if (sk->sk_state != TCP_LISTEN &&
1309 sk->sk_state != TCP_CLOSE)
1310 break;
1311 if (facilities.pacsize_in < X25_PS16 ||
1312 facilities.pacsize_in > X25_PS4096)
1313 break;
1314 if (facilities.pacsize_out < X25_PS16 ||
1315 facilities.pacsize_out > X25_PS4096)
1316 break;
1317 if (facilities.winsize_in < 1 ||
1318 facilities.winsize_in > 127)
1319 break;
1320 if (facilities.throughput < 0x03 ||
1321 facilities.throughput > 0xDD)
1322 break;
1323 if (facilities.reverse &&
1324 (facilities.reverse | 0x81)!= 0x81)
1325 break;
1326 x25->facilities = facilities;
1327 rc = 0;
1328 break;
1329 }
1330
1331 case SIOCX25GDTEFACILITIES: {
1332 rc = copy_to_user(argp, &x25->dte_facilities,
1333 sizeof(x25->dte_facilities));
1334 if (rc)
1335 rc = -EFAULT;
1336 break;
1337 }
1338
1339 case SIOCX25SDTEFACILITIES: {
1340 struct x25_dte_facilities dtefacs;
1341 rc = -EFAULT;
1342 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1343 break;
1344 rc = -EINVAL;
1345 if (sk->sk_state != TCP_LISTEN &&
1346 sk->sk_state != TCP_CLOSE)
1347 break;
1348 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1349 break;
1350 if (dtefacs.calling_ae == NULL)
1351 break;
1352 if (dtefacs.called_len > X25_MAX_AE_LEN)
1353 break;
1354 if (dtefacs.called_ae == NULL)
1355 break;
1356 x25->dte_facilities = dtefacs;
1357 rc = 0;
1358 break;
1359 }
1360
1361 case SIOCX25GCALLUSERDATA: {
1362 struct x25_calluserdata cud = x25->calluserdata;
1363 rc = copy_to_user(argp, &cud,
1364 sizeof(cud)) ? -EFAULT : 0;
1365 break;
1366 }
1367
1368 case SIOCX25SCALLUSERDATA: {
1369 struct x25_calluserdata calluserdata;
1370
1371 rc = -EFAULT;
1372 if (copy_from_user(&calluserdata, argp,
1373 sizeof(calluserdata)))
1374 break;
1375 rc = -EINVAL;
1376 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1377 break;
1378 x25->calluserdata = calluserdata;
1379 rc = 0;
1380 break;
1381 }
1382
1383 case SIOCX25GCAUSEDIAG: {
1384 struct x25_causediag causediag;
1385 causediag = x25->causediag;
1386 rc = copy_to_user(argp, &causediag,
1387 sizeof(causediag)) ? -EFAULT : 0;
1388 break;
1389 }
1390
1391 case SIOCX25SCUDMATCHLEN: {
1392 struct x25_subaddr sub_addr;
1393 rc = -EINVAL;
1394 if(sk->sk_state != TCP_CLOSE)
1395 break;
1396 rc = -EFAULT;
1397 if (copy_from_user(&sub_addr, argp,
1398 sizeof(sub_addr)))
1399 break;
1400 rc = -EINVAL;
1401 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1402 break;
1403 x25->cudmatchlength = sub_addr.cudmatchlength;
1404 rc = 0;
1405 break;
1406 }
1407
1408 case SIOCX25CALLACCPTAPPRV: {
1409 rc = -EINVAL;
1410 if (sk->sk_state != TCP_CLOSE)
1411 break;
1412 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1413 rc = 0;
1414 break;
1415 }
1416
1417 case SIOCX25SENDCALLACCPT: {
1418 rc = -EINVAL;
1419 if (sk->sk_state != TCP_ESTABLISHED)
1420 break;
1421 if (x25->accptapprv) /* must call accptapprv above */
1422 break;
1423 x25_write_internal(sk, X25_CALL_ACCEPTED);
1424 x25->state = X25_STATE_3;
1425 rc = 0;
1426 break;
1427 }
1428
1429 default:
1430 rc = -ENOIOCTLCMD;
1431 break;
1432 }
1433
1434 return rc;
1435 }
1436
1437 static struct net_proto_family x25_family_ops = {
1438 .family = AF_X25,
1439 .create = x25_create,
1440 .owner = THIS_MODULE,
1441 };
1442
1443 #ifdef CONFIG_COMPAT
1444 static int compat_x25_subscr_ioctl(unsigned int cmd,
1445 struct compat_x25_subscrip_struct __user *x25_subscr32)
1446 {
1447 struct compat_x25_subscrip_struct x25_subscr;
1448 struct x25_neigh *nb;
1449 struct net_device *dev;
1450 int rc = -EINVAL;
1451
1452 rc = -EFAULT;
1453 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1454 goto out;
1455
1456 rc = -EINVAL;
1457 dev = x25_dev_get(x25_subscr.device);
1458 if (dev == NULL)
1459 goto out;
1460
1461 nb = x25_get_neigh(dev);
1462 if (nb == NULL)
1463 goto out_dev_put;
1464
1465 dev_put(dev);
1466
1467 if (cmd == SIOCX25GSUBSCRIP) {
1468 x25_subscr.extended = nb->extended;
1469 x25_subscr.global_facil_mask = nb->global_facil_mask;
1470 rc = copy_to_user(x25_subscr32, &x25_subscr,
1471 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1472 } else {
1473 rc = -EINVAL;
1474 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1475 rc = 0;
1476 nb->extended = x25_subscr.extended;
1477 nb->global_facil_mask = x25_subscr.global_facil_mask;
1478 }
1479 }
1480 x25_neigh_put(nb);
1481 out:
1482 return rc;
1483 out_dev_put:
1484 dev_put(dev);
1485 goto out;
1486 }
1487
1488 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1489 unsigned long arg)
1490 {
1491 void __user *argp = compat_ptr(arg);
1492 struct sock *sk = sock->sk;
1493
1494 int rc = -ENOIOCTLCMD;
1495
1496 switch(cmd) {
1497 case TIOCOUTQ:
1498 case TIOCINQ:
1499 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1500 break;
1501 case SIOCGSTAMP:
1502 rc = -EINVAL;
1503 if (sk)
1504 rc = compat_sock_get_timestamp(sk,
1505 (struct timeval __user*)argp);
1506 break;
1507 case SIOCGIFADDR:
1508 case SIOCSIFADDR:
1509 case SIOCGIFDSTADDR:
1510 case SIOCSIFDSTADDR:
1511 case SIOCGIFBRDADDR:
1512 case SIOCSIFBRDADDR:
1513 case SIOCGIFNETMASK:
1514 case SIOCSIFNETMASK:
1515 case SIOCGIFMETRIC:
1516 case SIOCSIFMETRIC:
1517 rc = -EINVAL;
1518 break;
1519 case SIOCADDRT:
1520 case SIOCDELRT:
1521 rc = -EPERM;
1522 if (!capable(CAP_NET_ADMIN))
1523 break;
1524 rc = x25_route_ioctl(cmd, argp);
1525 break;
1526 case SIOCX25GSUBSCRIP:
1527 rc = compat_x25_subscr_ioctl(cmd, argp);
1528 break;
1529 case SIOCX25SSUBSCRIP:
1530 rc = -EPERM;
1531 if (!capable(CAP_NET_ADMIN))
1532 break;
1533 rc = compat_x25_subscr_ioctl(cmd, argp);
1534 break;
1535 case SIOCX25GFACILITIES:
1536 case SIOCX25SFACILITIES:
1537 case SIOCX25GDTEFACILITIES:
1538 case SIOCX25SDTEFACILITIES:
1539 case SIOCX25GCALLUSERDATA:
1540 case SIOCX25SCALLUSERDATA:
1541 case SIOCX25GCAUSEDIAG:
1542 case SIOCX25SCUDMATCHLEN:
1543 case SIOCX25CALLACCPTAPPRV:
1544 case SIOCX25SENDCALLACCPT:
1545 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1546 break;
1547 default:
1548 rc = -ENOIOCTLCMD;
1549 break;
1550 }
1551 return rc;
1552 }
1553 #endif
1554
1555 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1556 .family = AF_X25,
1557 .owner = THIS_MODULE,
1558 .release = x25_release,
1559 .bind = x25_bind,
1560 .connect = x25_connect,
1561 .socketpair = sock_no_socketpair,
1562 .accept = x25_accept,
1563 .getname = x25_getname,
1564 .poll = datagram_poll,
1565 .ioctl = x25_ioctl,
1566 #ifdef CONFIG_COMPAT
1567 .compat_ioctl = compat_x25_ioctl,
1568 #endif
1569 .listen = x25_listen,
1570 .shutdown = sock_no_shutdown,
1571 .setsockopt = x25_setsockopt,
1572 .getsockopt = x25_getsockopt,
1573 .sendmsg = x25_sendmsg,
1574 .recvmsg = x25_recvmsg,
1575 .mmap = sock_no_mmap,
1576 .sendpage = sock_no_sendpage,
1577 };
1578
1579 #include <linux/smp_lock.h>
1580 SOCKOPS_WRAP(x25_proto, AF_X25);
1581
1582 static struct packet_type x25_packet_type = {
1583 .type = __constant_htons(ETH_P_X25),
1584 .func = x25_lapb_receive_frame,
1585 };
1586
1587 static struct notifier_block x25_dev_notifier = {
1588 .notifier_call = x25_device_event,
1589 };
1590
1591 void x25_kill_by_neigh(struct x25_neigh *nb)
1592 {
1593 struct sock *s;
1594 struct hlist_node *node;
1595
1596 write_lock_bh(&x25_list_lock);
1597
1598 sk_for_each(s, node, &x25_list)
1599 if (x25_sk(s)->neighbour == nb)
1600 x25_disconnect(s, ENETUNREACH, 0, 0);
1601
1602 write_unlock_bh(&x25_list_lock);
1603 }
1604
1605 static int __init x25_init(void)
1606 {
1607 int rc = proto_register(&x25_proto, 0);
1608
1609 if (rc != 0)
1610 goto out;
1611
1612 sock_register(&x25_family_ops);
1613
1614 dev_add_pack(&x25_packet_type);
1615
1616 register_netdevice_notifier(&x25_dev_notifier);
1617
1618 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1619
1620 #ifdef CONFIG_SYSCTL
1621 x25_register_sysctl();
1622 #endif
1623 x25_proc_init();
1624 out:
1625 return rc;
1626 }
1627 module_init(x25_init);
1628
1629 static void __exit x25_exit(void)
1630 {
1631 x25_proc_exit();
1632 x25_link_free();
1633 x25_route_free();
1634
1635 #ifdef CONFIG_SYSCTL
1636 x25_unregister_sysctl();
1637 #endif
1638
1639 unregister_netdevice_notifier(&x25_dev_notifier);
1640
1641 dev_remove_pack(&x25_packet_type);
1642
1643 sock_unregister(AF_X25);
1644 proto_unregister(&x25_proto);
1645 }
1646 module_exit(x25_exit);
1647
1648 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1649 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1650 MODULE_LICENSE("GPL");
1651 MODULE_ALIAS_NETPROTO(PF_X25);
SocketAccessConTroL development