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V4L/DVB (12948): v4l1-compat: fix VIDIOC_G_STD handling
[linux/fpc-iii.git] / net / x25 / af_x25.c
blob5e6c072c64d3d8b3380cc68247565fa291237952
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, int optlen)
413 {
414 int opt;
415 struct sock *sk = sock->sk;
416 int rc = -ENOPROTOOPT;
417
418 if (level != SOL_X25 || optname != X25_QBITINCL)
419 goto out;
420
421 rc = -EINVAL;
422 if (optlen < sizeof(int))
423 goto out;
424
425 rc = -EFAULT;
426 if (get_user(opt, (int __user *)optval))
427 goto out;
428
429 x25_sk(sk)->qbitincl = !!opt;
430 rc = 0;
431 out:
432 return rc;
433 }
434
435 static int x25_getsockopt(struct socket *sock, int level, int optname,
436 char __user *optval, int __user *optlen)
437 {
438 struct sock *sk = sock->sk;
439 int val, len, rc = -ENOPROTOOPT;
440
441 if (level != SOL_X25 || optname != X25_QBITINCL)
442 goto out;
443
444 rc = -EFAULT;
445 if (get_user(len, optlen))
446 goto out;
447
448 len = min_t(unsigned int, len, sizeof(int));
449
450 rc = -EINVAL;
451 if (len < 0)
452 goto out;
453
454 rc = -EFAULT;
455 if (put_user(len, optlen))
456 goto out;
457
458 val = x25_sk(sk)->qbitincl;
459 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
460 out:
461 return rc;
462 }
463
464 static int x25_listen(struct socket *sock, int backlog)
465 {
466 struct sock *sk = sock->sk;
467 int rc = -EOPNOTSUPP;
468
469 if (sk->sk_state != TCP_LISTEN) {
470 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
471 sk->sk_max_ack_backlog = backlog;
472 sk->sk_state = TCP_LISTEN;
473 rc = 0;
474 }
475
476 return rc;
477 }
478
479 static struct proto x25_proto = {
480 .name = "X25",
481 .owner = THIS_MODULE,
482 .obj_size = sizeof(struct x25_sock),
483 };
484
485 static struct sock *x25_alloc_socket(struct net *net)
486 {
487 struct x25_sock *x25;
488 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
489
490 if (!sk)
491 goto out;
492
493 sock_init_data(NULL, sk);
494
495 x25 = x25_sk(sk);
496 skb_queue_head_init(&x25->ack_queue);
497 skb_queue_head_init(&x25->fragment_queue);
498 skb_queue_head_init(&x25->interrupt_in_queue);
499 skb_queue_head_init(&x25->interrupt_out_queue);
500 out:
501 return sk;
502 }
503
504 static int x25_create(struct net *net, struct socket *sock, int protocol)
505 {
506 struct sock *sk;
507 struct x25_sock *x25;
508 int rc = -ESOCKTNOSUPPORT;
509
510 if (net != &init_net)
511 return -EAFNOSUPPORT;
512
513 if (sock->type != SOCK_SEQPACKET || protocol)
514 goto out;
515
516 rc = -ENOMEM;
517 if ((sk = x25_alloc_socket(net)) == NULL)
518 goto out;
519
520 x25 = x25_sk(sk);
521
522 sock_init_data(sock, sk);
523
524 x25_init_timers(sk);
525
526 sock->ops = &x25_proto_ops;
527 sk->sk_protocol = protocol;
528 sk->sk_backlog_rcv = x25_backlog_rcv;
529
530 x25->t21 = sysctl_x25_call_request_timeout;
531 x25->t22 = sysctl_x25_reset_request_timeout;
532 x25->t23 = sysctl_x25_clear_request_timeout;
533 x25->t2 = sysctl_x25_ack_holdback_timeout;
534 x25->state = X25_STATE_0;
535 x25->cudmatchlength = 0;
536 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
537 /* on call accept */
538
539 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
540 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
541 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
542 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
543 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
544 x25->facilities.reverse = X25_DEFAULT_REVERSE;
545 x25->dte_facilities.calling_len = 0;
546 x25->dte_facilities.called_len = 0;
547 memset(x25->dte_facilities.called_ae, '\0',
548 sizeof(x25->dte_facilities.called_ae));
549 memset(x25->dte_facilities.calling_ae, '\0',
550 sizeof(x25->dte_facilities.calling_ae));
551
552 rc = 0;
553 out:
554 return rc;
555 }
556
557 static struct sock *x25_make_new(struct sock *osk)
558 {
559 struct sock *sk = NULL;
560 struct x25_sock *x25, *ox25;
561
562 if (osk->sk_type != SOCK_SEQPACKET)
563 goto out;
564
565 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
566 goto out;
567
568 x25 = x25_sk(sk);
569
570 sk->sk_type = osk->sk_type;
571 sk->sk_priority = osk->sk_priority;
572 sk->sk_protocol = osk->sk_protocol;
573 sk->sk_rcvbuf = osk->sk_rcvbuf;
574 sk->sk_sndbuf = osk->sk_sndbuf;
575 sk->sk_state = TCP_ESTABLISHED;
576 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
577 sock_copy_flags(sk, osk);
578
579 ox25 = x25_sk(osk);
580 x25->t21 = ox25->t21;
581 x25->t22 = ox25->t22;
582 x25->t23 = ox25->t23;
583 x25->t2 = ox25->t2;
584 x25->facilities = ox25->facilities;
585 x25->qbitincl = ox25->qbitincl;
586 x25->dte_facilities = ox25->dte_facilities;
587 x25->cudmatchlength = ox25->cudmatchlength;
588 x25->accptapprv = ox25->accptapprv;
589
590 x25_init_timers(sk);
591 out:
592 return sk;
593 }
594
595 static int x25_release(struct socket *sock)
596 {
597 struct sock *sk = sock->sk;
598 struct x25_sock *x25;
599
600 if (!sk)
601 goto out;
602
603 x25 = x25_sk(sk);
604
605 switch (x25->state) {
606
607 case X25_STATE_0:
608 case X25_STATE_2:
609 x25_disconnect(sk, 0, 0, 0);
610 x25_destroy_socket(sk);
611 goto out;
612
613 case X25_STATE_1:
614 case X25_STATE_3:
615 case X25_STATE_4:
616 x25_clear_queues(sk);
617 x25_write_internal(sk, X25_CLEAR_REQUEST);
618 x25_start_t23timer(sk);
619 x25->state = X25_STATE_2;
620 sk->sk_state = TCP_CLOSE;
621 sk->sk_shutdown |= SEND_SHUTDOWN;
622 sk->sk_state_change(sk);
623 sock_set_flag(sk, SOCK_DEAD);
624 sock_set_flag(sk, SOCK_DESTROY);
625 break;
626 }
627
628 sock_orphan(sk);
629 out:
630 return 0;
631 }
632
633 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
634 {
635 struct sock *sk = sock->sk;
636 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
637
638 if (!sock_flag(sk, SOCK_ZAPPED) ||
639 addr_len != sizeof(struct sockaddr_x25) ||
640 addr->sx25_family != AF_X25)
641 return -EINVAL;
642
643 x25_sk(sk)->source_addr = addr->sx25_addr;
644 x25_insert_socket(sk);
645 sock_reset_flag(sk, SOCK_ZAPPED);
646 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
647
648 return 0;
649 }
650
651 static int x25_wait_for_connection_establishment(struct sock *sk)
652 {
653 DECLARE_WAITQUEUE(wait, current);
654 int rc;
655
656 add_wait_queue_exclusive(sk->sk_sleep, &wait);
657 for (;;) {
658 __set_current_state(TASK_INTERRUPTIBLE);
659 rc = -ERESTARTSYS;
660 if (signal_pending(current))
661 break;
662 rc = sock_error(sk);
663 if (rc) {
664 sk->sk_socket->state = SS_UNCONNECTED;
665 break;
666 }
667 rc = 0;
668 if (sk->sk_state != TCP_ESTABLISHED) {
669 release_sock(sk);
670 schedule();
671 lock_sock(sk);
672 } else
673 break;
674 }
675 __set_current_state(TASK_RUNNING);
676 remove_wait_queue(sk->sk_sleep, &wait);
677 return rc;
678 }
679
680 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
681 int addr_len, int flags)
682 {
683 struct sock *sk = sock->sk;
684 struct x25_sock *x25 = x25_sk(sk);
685 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
686 struct x25_route *rt;
687 int rc = 0;
688
689 lock_sock(sk);
690 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
691 sock->state = SS_CONNECTED;
692 goto out; /* Connect completed during a ERESTARTSYS event */
693 }
694
695 rc = -ECONNREFUSED;
696 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
697 sock->state = SS_UNCONNECTED;
698 goto out;
699 }
700
701 rc = -EISCONN; /* No reconnect on a seqpacket socket */
702 if (sk->sk_state == TCP_ESTABLISHED)
703 goto out;
704
705 sk->sk_state = TCP_CLOSE;
706 sock->state = SS_UNCONNECTED;
707
708 rc = -EINVAL;
709 if (addr_len != sizeof(struct sockaddr_x25) ||
710 addr->sx25_family != AF_X25)
711 goto out;
712
713 rc = -ENETUNREACH;
714 rt = x25_get_route(&addr->sx25_addr);
715 if (!rt)
716 goto out;
717
718 x25->neighbour = x25_get_neigh(rt->dev);
719 if (!x25->neighbour)
720 goto out_put_route;
721
722 x25_limit_facilities(&x25->facilities, x25->neighbour);
723
724 x25->lci = x25_new_lci(x25->neighbour);
725 if (!x25->lci)
726 goto out_put_neigh;
727
728 rc = -EINVAL;
729 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
730 goto out_put_neigh;
731
732 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
733 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
734
735 x25->dest_addr = addr->sx25_addr;
736
737 /* Move to connecting socket, start sending Connect Requests */
738 sock->state = SS_CONNECTING;
739 sk->sk_state = TCP_SYN_SENT;
740
741 x25->state = X25_STATE_1;
742
743 x25_write_internal(sk, X25_CALL_REQUEST);
744
745 x25_start_heartbeat(sk);
746 x25_start_t21timer(sk);
747
748 /* Now the loop */
749 rc = -EINPROGRESS;
750 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
751 goto out_put_neigh;
752
753 rc = x25_wait_for_connection_establishment(sk);
754 if (rc)
755 goto out_put_neigh;
756
757 sock->state = SS_CONNECTED;
758 rc = 0;
759 out_put_neigh:
760 if (rc)
761 x25_neigh_put(x25->neighbour);
762 out_put_route:
763 x25_route_put(rt);
764 out:
765 release_sock(sk);
766 return rc;
767 }
768
769 static int x25_wait_for_data(struct sock *sk, long timeout)
770 {
771 DECLARE_WAITQUEUE(wait, current);
772 int rc = 0;
773
774 add_wait_queue_exclusive(sk->sk_sleep, &wait);
775 for (;;) {
776 __set_current_state(TASK_INTERRUPTIBLE);
777 if (sk->sk_shutdown & RCV_SHUTDOWN)
778 break;
779 rc = -ERESTARTSYS;
780 if (signal_pending(current))
781 break;
782 rc = -EAGAIN;
783 if (!timeout)
784 break;
785 rc = 0;
786 if (skb_queue_empty(&sk->sk_receive_queue)) {
787 release_sock(sk);
788 timeout = schedule_timeout(timeout);
789 lock_sock(sk);
790 } else
791 break;
792 }
793 __set_current_state(TASK_RUNNING);
794 remove_wait_queue(sk->sk_sleep, &wait);
795 return rc;
796 }
797
798 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
799 {
800 struct sock *sk = sock->sk;
801 struct sock *newsk;
802 struct sk_buff *skb;
803 int rc = -EINVAL;
804
805 if (!sk || sk->sk_state != TCP_LISTEN)
806 goto out;
807
808 rc = -EOPNOTSUPP;
809 if (sk->sk_type != SOCK_SEQPACKET)
810 goto out;
811
812 lock_sock(sk);
813 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
814 if (rc)
815 goto out2;
816 skb = skb_dequeue(&sk->sk_receive_queue);
817 rc = -EINVAL;
818 if (!skb->sk)
819 goto out2;
820 newsk = skb->sk;
821 sock_graft(newsk, newsock);
822
823 /* Now attach up the new socket */
824 skb->sk = NULL;
825 kfree_skb(skb);
826 sk->sk_ack_backlog--;
827 newsock->state = SS_CONNECTED;
828 rc = 0;
829 out2:
830 release_sock(sk);
831 out:
832 return rc;
833 }
834
835 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
836 int *uaddr_len, int peer)
837 {
838 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
839 struct sock *sk = sock->sk;
840 struct x25_sock *x25 = x25_sk(sk);
841
842 if (peer) {
843 if (sk->sk_state != TCP_ESTABLISHED)
844 return -ENOTCONN;
845 sx25->sx25_addr = x25->dest_addr;
846 } else
847 sx25->sx25_addr = x25->source_addr;
848
849 sx25->sx25_family = AF_X25;
850 *uaddr_len = sizeof(*sx25);
851
852 return 0;
853 }
854
855 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
856 unsigned int lci)
857 {
858 struct sock *sk;
859 struct sock *make;
860 struct x25_sock *makex25;
861 struct x25_address source_addr, dest_addr;
862 struct x25_facilities facilities;
863 struct x25_dte_facilities dte_facilities;
864 int len, addr_len, rc;
865
866 /*
867 * Remove the LCI and frame type.
868 */
869 skb_pull(skb, X25_STD_MIN_LEN);
870
871 /*
872 * Extract the X.25 addresses and convert them to ASCII strings,
873 * and remove them.
874 */
875 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
876 skb_pull(skb, addr_len);
877
878 /*
879 * Get the length of the facilities, skip past them for the moment
880 * get the call user data because this is needed to determine
881 * the correct listener
882 */
883 len = skb->data[0] + 1;
884 skb_pull(skb,len);
885
886 /*
887 * Find a listener for the particular address/cud pair.
888 */
889 sk = x25_find_listener(&source_addr,skb);
890 skb_push(skb,len);
891
892 if (sk != NULL && sk_acceptq_is_full(sk)) {
893 goto out_sock_put;
894 }
895
896 /*
897 * We dont have any listeners for this incoming call.
898 * Try forwarding it.
899 */
900 if (sk == NULL) {
901 skb_push(skb, addr_len + X25_STD_MIN_LEN);
902 if (sysctl_x25_forward &&
903 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
904 {
905 /* Call was forwarded, dont process it any more */
906 kfree_skb(skb);
907 rc = 1;
908 goto out;
909 } else {
910 /* No listeners, can't forward, clear the call */
911 goto out_clear_request;
912 }
913 }
914
915 /*
916 * Try to reach a compromise on the requested facilities.
917 */
918 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
919 if (len == -1)
920 goto out_sock_put;
921
922 /*
923 * current neighbour/link might impose additional limits
924 * on certain facilties
925 */
926
927 x25_limit_facilities(&facilities, nb);
928
929 /*
930 * Try to create a new socket.
931 */
932 make = x25_make_new(sk);
933 if (!make)
934 goto out_sock_put;
935
936 /*
937 * Remove the facilities
938 */
939 skb_pull(skb, len);
940
941 skb->sk = make;
942 make->sk_state = TCP_ESTABLISHED;
943
944 makex25 = x25_sk(make);
945 makex25->lci = lci;
946 makex25->dest_addr = dest_addr;
947 makex25->source_addr = source_addr;
948 makex25->neighbour = nb;
949 makex25->facilities = facilities;
950 makex25->dte_facilities= dte_facilities;
951 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
952 /* ensure no reverse facil on accept */
953 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
954 /* ensure no calling address extension on accept */
955 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
956 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
957
958 /* Normally all calls are accepted immediatly */
959 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
960 x25_write_internal(make, X25_CALL_ACCEPTED);
961 makex25->state = X25_STATE_3;
962 }
963
964 /*
965 * Incoming Call User Data.
966 */
967 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
968 makex25->calluserdata.cudlength = skb->len;
969
970 sk->sk_ack_backlog++;
971
972 x25_insert_socket(make);
973
974 skb_queue_head(&sk->sk_receive_queue, skb);
975
976 x25_start_heartbeat(make);
977
978 if (!sock_flag(sk, SOCK_DEAD))
979 sk->sk_data_ready(sk, skb->len);
980 rc = 1;
981 sock_put(sk);
982 out:
983 return rc;
984 out_sock_put:
985 sock_put(sk);
986 out_clear_request:
987 rc = 0;
988 x25_transmit_clear_request(nb, lci, 0x01);
989 goto out;
990 }
991
992 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
993 struct msghdr *msg, size_t len)
994 {
995 struct sock *sk = sock->sk;
996 struct x25_sock *x25 = x25_sk(sk);
997 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
998 struct sockaddr_x25 sx25;
999 struct sk_buff *skb;
1000 unsigned char *asmptr;
1001 int noblock = msg->msg_flags & MSG_DONTWAIT;
1002 size_t size;
1003 int qbit = 0, rc = -EINVAL;
1004
1005 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1006 goto out;
1007
1008 /* we currently don't support segmented records at the user interface */
1009 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1010 goto out;
1011
1012 rc = -EADDRNOTAVAIL;
1013 if (sock_flag(sk, SOCK_ZAPPED))
1014 goto out;
1015
1016 rc = -EPIPE;
1017 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1018 send_sig(SIGPIPE, current, 0);
1019 goto out;
1020 }
1021
1022 rc = -ENETUNREACH;
1023 if (!x25->neighbour)
1024 goto out;
1025
1026 if (usx25) {
1027 rc = -EINVAL;
1028 if (msg->msg_namelen < sizeof(sx25))
1029 goto out;
1030 memcpy(&sx25, usx25, sizeof(sx25));
1031 rc = -EISCONN;
1032 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1033 goto out;
1034 rc = -EINVAL;
1035 if (sx25.sx25_family != AF_X25)
1036 goto out;
1037 } else {
1038 /*
1039 * FIXME 1003.1g - if the socket is like this because
1040 * it has become closed (not started closed) we ought
1041 * to SIGPIPE, EPIPE;
1042 */
1043 rc = -ENOTCONN;
1044 if (sk->sk_state != TCP_ESTABLISHED)
1045 goto out;
1046
1047 sx25.sx25_family = AF_X25;
1048 sx25.sx25_addr = x25->dest_addr;
1049 }
1050
1051 /* Sanity check the packet size */
1052 if (len > 65535) {
1053 rc = -EMSGSIZE;
1054 goto out;
1055 }
1056
1057 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1058
1059 /* Build a packet */
1060 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1061
1062 if ((msg->msg_flags & MSG_OOB) && len > 32)
1063 len = 32;
1064
1065 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1066
1067 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1068 if (!skb)
1069 goto out;
1070 X25_SKB_CB(skb)->flags = msg->msg_flags;
1071
1072 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1073
1074 /*
1075 * Put the data on the end
1076 */
1077 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1078
1079 skb_reset_transport_header(skb);
1080 skb_put(skb, len);
1081
1082 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1083 if (rc)
1084 goto out_kfree_skb;
1085
1086 /*
1087 * If the Q BIT Include socket option is in force, the first
1088 * byte of the user data is the logical value of the Q Bit.
1089 */
1090 if (x25->qbitincl) {
1091 qbit = skb->data[0];
1092 skb_pull(skb, 1);
1093 }
1094
1095 /*
1096 * Push down the X.25 header
1097 */
1098 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1099
1100 if (msg->msg_flags & MSG_OOB) {
1101 if (x25->neighbour->extended) {
1102 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1103 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1104 *asmptr++ = (x25->lci >> 0) & 0xFF;
1105 *asmptr++ = X25_INTERRUPT;
1106 } else {
1107 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1108 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1109 *asmptr++ = (x25->lci >> 0) & 0xFF;
1110 *asmptr++ = X25_INTERRUPT;
1111 }
1112 } else {
1113 if (x25->neighbour->extended) {
1114 /* Build an Extended X.25 header */
1115 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1116 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1117 *asmptr++ = (x25->lci >> 0) & 0xFF;
1118 *asmptr++ = X25_DATA;
1119 *asmptr++ = X25_DATA;
1120 } else {
1121 /* Build an Standard X.25 header */
1122 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1123 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1124 *asmptr++ = (x25->lci >> 0) & 0xFF;
1125 *asmptr++ = X25_DATA;
1126 }
1127
1128 if (qbit)
1129 skb->data[0] |= X25_Q_BIT;
1130 }
1131
1132 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1133 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1134
1135 rc = -ENOTCONN;
1136 if (sk->sk_state != TCP_ESTABLISHED)
1137 goto out_kfree_skb;
1138
1139 if (msg->msg_flags & MSG_OOB)
1140 skb_queue_tail(&x25->interrupt_out_queue, skb);
1141 else {
1142 rc = x25_output(sk, skb);
1143 len = rc;
1144 if (rc < 0)
1145 kfree_skb(skb);
1146 else if (x25->qbitincl)
1147 len++;
1148 }
1149
1150 /*
1151 * lock_sock() is currently only used to serialize this x25_kick()
1152 * against input-driven x25_kick() calls. It currently only blocks
1153 * incoming packets for this socket and does not protect against
1154 * any other socket state changes and is not called from anywhere
1155 * else. As x25_kick() cannot block and as long as all socket
1156 * operations are BKL-wrapped, we don't need take to care about
1157 * purging the backlog queue in x25_release().
1158 *
1159 * Using lock_sock() to protect all socket operations entirely
1160 * (and making the whole x25 stack SMP aware) unfortunately would
1161 * require major changes to {send,recv}msg and skb allocation methods.
1162 * -> 2.5 ;)
1163 */
1164 lock_sock(sk);
1165 x25_kick(sk);
1166 release_sock(sk);
1167 rc = len;
1168 out:
1169 return rc;
1170 out_kfree_skb:
1171 kfree_skb(skb);
1172 goto out;
1173 }
1174
1175
1176 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1177 struct msghdr *msg, size_t size,
1178 int flags)
1179 {
1180 struct sock *sk = sock->sk;
1181 struct x25_sock *x25 = x25_sk(sk);
1182 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1183 size_t copied;
1184 int qbit;
1185 struct sk_buff *skb;
1186 unsigned char *asmptr;
1187 int rc = -ENOTCONN;
1188
1189 /*
1190 * This works for seqpacket too. The receiver has ordered the queue for
1191 * us! We do one quick check first though
1192 */
1193 if (sk->sk_state != TCP_ESTABLISHED)
1194 goto out;
1195
1196 if (flags & MSG_OOB) {
1197 rc = -EINVAL;
1198 if (sock_flag(sk, SOCK_URGINLINE) ||
1199 !skb_peek(&x25->interrupt_in_queue))
1200 goto out;
1201
1202 skb = skb_dequeue(&x25->interrupt_in_queue);
1203
1204 skb_pull(skb, X25_STD_MIN_LEN);
1205
1206 /*
1207 * No Q bit information on Interrupt data.
1208 */
1209 if (x25->qbitincl) {
1210 asmptr = skb_push(skb, 1);
1211 *asmptr = 0x00;
1212 }
1213
1214 msg->msg_flags |= MSG_OOB;
1215 } else {
1216 /* Now we can treat all alike */
1217 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1218 flags & MSG_DONTWAIT, &rc);
1219 if (!skb)
1220 goto out;
1221
1222 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1223
1224 skb_pull(skb, x25->neighbour->extended ?
1225 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1226
1227 if (x25->qbitincl) {
1228 asmptr = skb_push(skb, 1);
1229 *asmptr = qbit;
1230 }
1231 }
1232
1233 skb_reset_transport_header(skb);
1234 copied = skb->len;
1235
1236 if (copied > size) {
1237 copied = size;
1238 msg->msg_flags |= MSG_TRUNC;
1239 }
1240
1241 /* Currently, each datagram always contains a complete record */
1242 msg->msg_flags |= MSG_EOR;
1243
1244 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1245 if (rc)
1246 goto out_free_dgram;
1247
1248 if (sx25) {
1249 sx25->sx25_family = AF_X25;
1250 sx25->sx25_addr = x25->dest_addr;
1251 }
1252
1253 msg->msg_namelen = sizeof(struct sockaddr_x25);
1254
1255 lock_sock(sk);
1256 x25_check_rbuf(sk);
1257 release_sock(sk);
1258 rc = copied;
1259 out_free_dgram:
1260 skb_free_datagram(sk, skb);
1261 out:
1262 return rc;
1263 }
1264
1265
1266 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1267 {
1268 struct sock *sk = sock->sk;
1269 struct x25_sock *x25 = x25_sk(sk);
1270 void __user *argp = (void __user *)arg;
1271 int rc;
1272
1273 switch (cmd) {
1274 case TIOCOUTQ: {
1275 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1276
1277 if (amount < 0)
1278 amount = 0;
1279 rc = put_user(amount, (unsigned int __user *)argp);
1280 break;
1281 }
1282
1283 case TIOCINQ: {
1284 struct sk_buff *skb;
1285 int amount = 0;
1286 /*
1287 * These two are safe on a single CPU system as
1288 * only user tasks fiddle here
1289 */
1290 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1291 amount = skb->len;
1292 rc = put_user(amount, (unsigned int __user *)argp);
1293 break;
1294 }
1295
1296 case SIOCGSTAMP:
1297 rc = -EINVAL;
1298 if (sk)
1299 rc = sock_get_timestamp(sk,
1300 (struct timeval __user *)argp);
1301 break;
1302 case SIOCGSTAMPNS:
1303 rc = -EINVAL;
1304 if (sk)
1305 rc = sock_get_timestampns(sk,
1306 (struct timespec __user *)argp);
1307 break;
1308 case SIOCGIFADDR:
1309 case SIOCSIFADDR:
1310 case SIOCGIFDSTADDR:
1311 case SIOCSIFDSTADDR:
1312 case SIOCGIFBRDADDR:
1313 case SIOCSIFBRDADDR:
1314 case SIOCGIFNETMASK:
1315 case SIOCSIFNETMASK:
1316 case SIOCGIFMETRIC:
1317 case SIOCSIFMETRIC:
1318 rc = -EINVAL;
1319 break;
1320 case SIOCADDRT:
1321 case SIOCDELRT:
1322 rc = -EPERM;
1323 if (!capable(CAP_NET_ADMIN))
1324 break;
1325 rc = x25_route_ioctl(cmd, argp);
1326 break;
1327 case SIOCX25GSUBSCRIP:
1328 rc = x25_subscr_ioctl(cmd, argp);
1329 break;
1330 case SIOCX25SSUBSCRIP:
1331 rc = -EPERM;
1332 if (!capable(CAP_NET_ADMIN))
1333 break;
1334 rc = x25_subscr_ioctl(cmd, argp);
1335 break;
1336 case SIOCX25GFACILITIES: {
1337 struct x25_facilities fac = x25->facilities;
1338 rc = copy_to_user(argp, &fac,
1339 sizeof(fac)) ? -EFAULT : 0;
1340 break;
1341 }
1342
1343 case SIOCX25SFACILITIES: {
1344 struct x25_facilities facilities;
1345 rc = -EFAULT;
1346 if (copy_from_user(&facilities, argp,
1347 sizeof(facilities)))
1348 break;
1349 rc = -EINVAL;
1350 if (sk->sk_state != TCP_LISTEN &&
1351 sk->sk_state != TCP_CLOSE)
1352 break;
1353 if (facilities.pacsize_in < X25_PS16 ||
1354 facilities.pacsize_in > X25_PS4096)
1355 break;
1356 if (facilities.pacsize_out < X25_PS16 ||
1357 facilities.pacsize_out > X25_PS4096)
1358 break;
1359 if (facilities.winsize_in < 1 ||
1360 facilities.winsize_in > 127)
1361 break;
1362 if (facilities.throughput < 0x03 ||
1363 facilities.throughput > 0xDD)
1364 break;
1365 if (facilities.reverse &&
1366 (facilities.reverse | 0x81)!= 0x81)
1367 break;
1368 x25->facilities = facilities;
1369 rc = 0;
1370 break;
1371 }
1372
1373 case SIOCX25GDTEFACILITIES: {
1374 rc = copy_to_user(argp, &x25->dte_facilities,
1375 sizeof(x25->dte_facilities));
1376 if (rc)
1377 rc = -EFAULT;
1378 break;
1379 }
1380
1381 case SIOCX25SDTEFACILITIES: {
1382 struct x25_dte_facilities dtefacs;
1383 rc = -EFAULT;
1384 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1385 break;
1386 rc = -EINVAL;
1387 if (sk->sk_state != TCP_LISTEN &&
1388 sk->sk_state != TCP_CLOSE)
1389 break;
1390 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1391 break;
1392 if (dtefacs.calling_ae == NULL)
1393 break;
1394 if (dtefacs.called_len > X25_MAX_AE_LEN)
1395 break;
1396 if (dtefacs.called_ae == NULL)
1397 break;
1398 x25->dte_facilities = dtefacs;
1399 rc = 0;
1400 break;
1401 }
1402
1403 case SIOCX25GCALLUSERDATA: {
1404 struct x25_calluserdata cud = x25->calluserdata;
1405 rc = copy_to_user(argp, &cud,
1406 sizeof(cud)) ? -EFAULT : 0;
1407 break;
1408 }
1409
1410 case SIOCX25SCALLUSERDATA: {
1411 struct x25_calluserdata calluserdata;
1412
1413 rc = -EFAULT;
1414 if (copy_from_user(&calluserdata, argp,
1415 sizeof(calluserdata)))
1416 break;
1417 rc = -EINVAL;
1418 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1419 break;
1420 x25->calluserdata = calluserdata;
1421 rc = 0;
1422 break;
1423 }
1424
1425 case SIOCX25GCAUSEDIAG: {
1426 struct x25_causediag causediag;
1427 causediag = x25->causediag;
1428 rc = copy_to_user(argp, &causediag,
1429 sizeof(causediag)) ? -EFAULT : 0;
1430 break;
1431 }
1432
1433 case SIOCX25SCUDMATCHLEN: {
1434 struct x25_subaddr sub_addr;
1435 rc = -EINVAL;
1436 if(sk->sk_state != TCP_CLOSE)
1437 break;
1438 rc = -EFAULT;
1439 if (copy_from_user(&sub_addr, argp,
1440 sizeof(sub_addr)))
1441 break;
1442 rc = -EINVAL;
1443 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1444 break;
1445 x25->cudmatchlength = sub_addr.cudmatchlength;
1446 rc = 0;
1447 break;
1448 }
1449
1450 case SIOCX25CALLACCPTAPPRV: {
1451 rc = -EINVAL;
1452 if (sk->sk_state != TCP_CLOSE)
1453 break;
1454 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1455 rc = 0;
1456 break;
1457 }
1458
1459 case SIOCX25SENDCALLACCPT: {
1460 rc = -EINVAL;
1461 if (sk->sk_state != TCP_ESTABLISHED)
1462 break;
1463 if (x25->accptapprv) /* must call accptapprv above */
1464 break;
1465 x25_write_internal(sk, X25_CALL_ACCEPTED);
1466 x25->state = X25_STATE_3;
1467 rc = 0;
1468 break;
1469 }
1470
1471 default:
1472 rc = -ENOIOCTLCMD;
1473 break;
1474 }
1475
1476 return rc;
1477 }
1478
1479 static struct net_proto_family x25_family_ops = {
1480 .family = AF_X25,
1481 .create = x25_create,
1482 .owner = THIS_MODULE,
1483 };
1484
1485 #ifdef CONFIG_COMPAT
1486 static int compat_x25_subscr_ioctl(unsigned int cmd,
1487 struct compat_x25_subscrip_struct __user *x25_subscr32)
1488 {
1489 struct compat_x25_subscrip_struct x25_subscr;
1490 struct x25_neigh *nb;
1491 struct net_device *dev;
1492 int rc = -EINVAL;
1493
1494 rc = -EFAULT;
1495 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1496 goto out;
1497
1498 rc = -EINVAL;
1499 dev = x25_dev_get(x25_subscr.device);
1500 if (dev == NULL)
1501 goto out;
1502
1503 nb = x25_get_neigh(dev);
1504 if (nb == NULL)
1505 goto out_dev_put;
1506
1507 dev_put(dev);
1508
1509 if (cmd == SIOCX25GSUBSCRIP) {
1510 x25_subscr.extended = nb->extended;
1511 x25_subscr.global_facil_mask = nb->global_facil_mask;
1512 rc = copy_to_user(x25_subscr32, &x25_subscr,
1513 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1514 } else {
1515 rc = -EINVAL;
1516 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1517 rc = 0;
1518 nb->extended = x25_subscr.extended;
1519 nb->global_facil_mask = x25_subscr.global_facil_mask;
1520 }
1521 }
1522 x25_neigh_put(nb);
1523 out:
1524 return rc;
1525 out_dev_put:
1526 dev_put(dev);
1527 goto out;
1528 }
1529
1530 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1531 unsigned long arg)
1532 {
1533 void __user *argp = compat_ptr(arg);
1534 struct sock *sk = sock->sk;
1535
1536 int rc = -ENOIOCTLCMD;
1537
1538 switch(cmd) {
1539 case TIOCOUTQ:
1540 case TIOCINQ:
1541 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1542 break;
1543 case SIOCGSTAMP:
1544 rc = -EINVAL;
1545 if (sk)
1546 rc = compat_sock_get_timestamp(sk,
1547 (struct timeval __user*)argp);
1548 break;
1549 case SIOCGSTAMPNS:
1550 rc = -EINVAL;
1551 if (sk)
1552 rc = compat_sock_get_timestampns(sk,
1553 (struct timespec __user*)argp);
1554 break;
1555 case SIOCGIFADDR:
1556 case SIOCSIFADDR:
1557 case SIOCGIFDSTADDR:
1558 case SIOCSIFDSTADDR:
1559 case SIOCGIFBRDADDR:
1560 case SIOCSIFBRDADDR:
1561 case SIOCGIFNETMASK:
1562 case SIOCSIFNETMASK:
1563 case SIOCGIFMETRIC:
1564 case SIOCSIFMETRIC:
1565 rc = -EINVAL;
1566 break;
1567 case SIOCADDRT:
1568 case SIOCDELRT:
1569 rc = -EPERM;
1570 if (!capable(CAP_NET_ADMIN))
1571 break;
1572 rc = x25_route_ioctl(cmd, argp);
1573 break;
1574 case SIOCX25GSUBSCRIP:
1575 rc = compat_x25_subscr_ioctl(cmd, argp);
1576 break;
1577 case SIOCX25SSUBSCRIP:
1578 rc = -EPERM;
1579 if (!capable(CAP_NET_ADMIN))
1580 break;
1581 rc = compat_x25_subscr_ioctl(cmd, argp);
1582 break;
1583 case SIOCX25GFACILITIES:
1584 case SIOCX25SFACILITIES:
1585 case SIOCX25GDTEFACILITIES:
1586 case SIOCX25SDTEFACILITIES:
1587 case SIOCX25GCALLUSERDATA:
1588 case SIOCX25SCALLUSERDATA:
1589 case SIOCX25GCAUSEDIAG:
1590 case SIOCX25SCUDMATCHLEN:
1591 case SIOCX25CALLACCPTAPPRV:
1592 case SIOCX25SENDCALLACCPT:
1593 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1594 break;
1595 default:
1596 rc = -ENOIOCTLCMD;
1597 break;
1598 }
1599 return rc;
1600 }
1601 #endif
1602
1603 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1604 .family = AF_X25,
1605 .owner = THIS_MODULE,
1606 .release = x25_release,
1607 .bind = x25_bind,
1608 .connect = x25_connect,
1609 .socketpair = sock_no_socketpair,
1610 .accept = x25_accept,
1611 .getname = x25_getname,
1612 .poll = datagram_poll,
1613 .ioctl = x25_ioctl,
1614 #ifdef CONFIG_COMPAT
1615 .compat_ioctl = compat_x25_ioctl,
1616 #endif
1617 .listen = x25_listen,
1618 .shutdown = sock_no_shutdown,
1619 .setsockopt = x25_setsockopt,
1620 .getsockopt = x25_getsockopt,
1621 .sendmsg = x25_sendmsg,
1622 .recvmsg = x25_recvmsg,
1623 .mmap = sock_no_mmap,
1624 .sendpage = sock_no_sendpage,
1625 };
1626
1627 SOCKOPS_WRAP(x25_proto, AF_X25);
1628
1629 static struct packet_type x25_packet_type __read_mostly = {
1630 .type = cpu_to_be16(ETH_P_X25),
1631 .func = x25_lapb_receive_frame,
1632 };
1633
1634 static struct notifier_block x25_dev_notifier = {
1635 .notifier_call = x25_device_event,
1636 };
1637
1638 void x25_kill_by_neigh(struct x25_neigh *nb)
1639 {
1640 struct sock *s;
1641 struct hlist_node *node;
1642
1643 write_lock_bh(&x25_list_lock);
1644
1645 sk_for_each(s, node, &x25_list)
1646 if (x25_sk(s)->neighbour == nb)
1647 x25_disconnect(s, ENETUNREACH, 0, 0);
1648
1649 write_unlock_bh(&x25_list_lock);
1650
1651 /* Remove any related forwards */
1652 x25_clear_forward_by_dev(nb->dev);
1653 }
1654
1655 static int __init x25_init(void)
1656 {
1657 int rc = proto_register(&x25_proto, 0);
1658
1659 if (rc != 0)
1660 goto out;
1661
1662 sock_register(&x25_family_ops);
1663
1664 dev_add_pack(&x25_packet_type);
1665
1666 register_netdevice_notifier(&x25_dev_notifier);
1667
1668 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1669
1670 #ifdef CONFIG_SYSCTL
1671 x25_register_sysctl();
1672 #endif
1673 x25_proc_init();
1674 out:
1675 return rc;
1676 }
1677 module_init(x25_init);
1678
1679 static void __exit x25_exit(void)
1680 {
1681 x25_proc_exit();
1682 x25_link_free();
1683 x25_route_free();
1684
1685 #ifdef CONFIG_SYSCTL
1686 x25_unregister_sysctl();
1687 #endif
1688
1689 unregister_netdevice_notifier(&x25_dev_notifier);
1690
1691 dev_remove_pack(&x25_packet_type);
1692
1693 sock_unregister(AF_X25);
1694 proto_unregister(&x25_proto);
1695 }
1696 module_exit(x25_exit);
1697
1698 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1699 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1700 MODULE_LICENSE("GPL");
1701 MODULE_ALIAS_NETPROTO(PF_X25);
Linux with added FPC-III support