?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / x25 / af_x25.c
blob373e14f21a17820fad0f4c64135421b3a9c0fb44
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 <linux/slab.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 #include <linux/ctype.h>
59
60 #include <net/x25.h>
61 #include <net/compat.h>
62
63 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
64 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
65 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
66 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
67 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
68 int sysctl_x25_forward = 0;
69
70 HLIST_HEAD(x25_list);
71 DEFINE_RWLOCK(x25_list_lock);
72
73 static const struct proto_ops x25_proto_ops;
74
75 static struct x25_address null_x25_address = {" "};
76
77 #ifdef CONFIG_COMPAT
78 struct compat_x25_subscrip_struct {
79 char device[200-sizeof(compat_ulong_t)];
80 compat_ulong_t global_facil_mask;
81 compat_uint_t extended;
82 };
83 #endif
84
85
86 int x25_parse_address_block(struct sk_buff *skb,
87 struct x25_address *called_addr,
88 struct x25_address *calling_addr)
89 {
90 unsigned char len;
91 int needed;
92 int rc;
93
94 if (skb->len < 1) {
95 /* packet has no address block */
96 rc = 0;
97 goto empty;
98 }
99
100 len = *skb->data;
101 needed = 1 + (len >> 4) + (len & 0x0f);
102
103 if (skb->len < needed) {
104 /* packet is too short to hold the addresses it claims
105 to hold */
106 rc = -1;
107 goto empty;
108 }
109
110 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
111
112 empty:
113 *called_addr->x25_addr = 0;
114 *calling_addr->x25_addr = 0;
115
116 return rc;
117 }
118
119
120 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
121 struct x25_address *calling_addr)
122 {
123 unsigned int called_len, calling_len;
124 char *called, *calling;
125 unsigned int i;
126
127 called_len = (*p >> 0) & 0x0F;
128 calling_len = (*p >> 4) & 0x0F;
129
130 called = called_addr->x25_addr;
131 calling = calling_addr->x25_addr;
132 p++;
133
134 for (i = 0; i < (called_len + calling_len); i++) {
135 if (i < called_len) {
136 if (i % 2 != 0) {
137 *called++ = ((*p >> 0) & 0x0F) + '0';
138 p++;
139 } else {
140 *called++ = ((*p >> 4) & 0x0F) + '0';
141 }
142 } else {
143 if (i % 2 != 0) {
144 *calling++ = ((*p >> 0) & 0x0F) + '0';
145 p++;
146 } else {
147 *calling++ = ((*p >> 4) & 0x0F) + '0';
148 }
149 }
150 }
151
152 *called = *calling = '\0';
153
154 return 1 + (called_len + calling_len + 1) / 2;
155 }
156
157 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
158 struct x25_address *calling_addr)
159 {
160 unsigned int called_len, calling_len;
161 char *called, *calling;
162 int i;
163
164 called = called_addr->x25_addr;
165 calling = calling_addr->x25_addr;
166
167 called_len = strlen(called);
168 calling_len = strlen(calling);
169
170 *p++ = (calling_len << 4) | (called_len << 0);
171
172 for (i = 0; i < (called_len + calling_len); i++) {
173 if (i < called_len) {
174 if (i % 2 != 0) {
175 *p |= (*called++ - '0') << 0;
176 p++;
177 } else {
178 *p = 0x00;
179 *p |= (*called++ - '0') << 4;
180 }
181 } else {
182 if (i % 2 != 0) {
183 *p |= (*calling++ - '0') << 0;
184 p++;
185 } else {
186 *p = 0x00;
187 *p |= (*calling++ - '0') << 4;
188 }
189 }
190 }
191
192 return 1 + (called_len + calling_len + 1) / 2;
193 }
194
195 /*
196 * Socket removal during an interrupt is now safe.
197 */
198 static void x25_remove_socket(struct sock *sk)
199 {
200 write_lock_bh(&x25_list_lock);
201 sk_del_node_init(sk);
202 write_unlock_bh(&x25_list_lock);
203 }
204
205 /*
206 * Kill all bound sockets on a dropped device.
207 */
208 static void x25_kill_by_device(struct net_device *dev)
209 {
210 struct sock *s;
211 struct hlist_node *node;
212
213 write_lock_bh(&x25_list_lock);
214
215 sk_for_each(s, node, &x25_list)
216 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
217 x25_disconnect(s, ENETUNREACH, 0, 0);
218
219 write_unlock_bh(&x25_list_lock);
220 }
221
222 /*
223 * Handle device status changes.
224 */
225 static int x25_device_event(struct notifier_block *this, unsigned long event,
226 void *ptr)
227 {
228 struct net_device *dev = ptr;
229 struct x25_neigh *nb;
230
231 if (!net_eq(dev_net(dev), &init_net))
232 return NOTIFY_DONE;
233
234 if (dev->type == ARPHRD_X25
235 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
236 || dev->type == ARPHRD_ETHER
237 #endif
238 ) {
239 switch (event) {
240 case NETDEV_UP:
241 x25_link_device_up(dev);
242 break;
243 case NETDEV_GOING_DOWN:
244 nb = x25_get_neigh(dev);
245 if (nb) {
246 x25_terminate_link(nb);
247 x25_neigh_put(nb);
248 }
249 break;
250 case NETDEV_DOWN:
251 x25_kill_by_device(dev);
252 x25_route_device_down(dev);
253 x25_link_device_down(dev);
254 break;
255 }
256 }
257
258 return NOTIFY_DONE;
259 }
260
261 /*
262 * Add a socket to the bound sockets list.
263 */
264 static void x25_insert_socket(struct sock *sk)
265 {
266 write_lock_bh(&x25_list_lock);
267 sk_add_node(sk, &x25_list);
268 write_unlock_bh(&x25_list_lock);
269 }
270
271 /*
272 * Find a socket that wants to accept the Call Request we just
273 * received. Check the full list for an address/cud match.
274 * If no cuds match return the next_best thing, an address match.
275 * Note: if a listening socket has cud set it must only get calls
276 * with matching cud.
277 */
278 static struct sock *x25_find_listener(struct x25_address *addr,
279 struct sk_buff *skb)
280 {
281 struct sock *s;
282 struct sock *next_best;
283 struct hlist_node *node;
284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
288 sk_for_each(s, node, &x25_list)
289 if ((!strcmp(addr->x25_addr,
290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(addr->x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
294 /*
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
297 */
298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
301 skb->data,
302 x25_sk(s)->cudmatchlength)) == 0) {
303 sock_hold(s);
304 goto found;
305 }
306 } else
307 next_best = s;
308 }
309 if (next_best) {
310 s = next_best;
311 sock_hold(s);
312 goto found;
313 }
314 s = NULL;
315 found:
316 read_unlock_bh(&x25_list_lock);
317 return s;
318 }
319
320 /*
321 * Find a connected X.25 socket given my LCI and neighbour.
322 */
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
324 {
325 struct sock *s;
326 struct hlist_node *node;
327
328 sk_for_each(s, node, &x25_list)
329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
330 sock_hold(s);
331 goto found;
332 }
333 s = NULL;
334 found:
335 return s;
336 }
337
338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
339 {
340 struct sock *s;
341
342 read_lock_bh(&x25_list_lock);
343 s = __x25_find_socket(lci, nb);
344 read_unlock_bh(&x25_list_lock);
345 return s;
346 }
347
348 /*
349 * Find a unique LCI for a given device.
350 */
351 static unsigned int x25_new_lci(struct x25_neigh *nb)
352 {
353 unsigned int lci = 1;
354 struct sock *sk;
355
356 read_lock_bh(&x25_list_lock);
357
358 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
359 sock_put(sk);
360 if (++lci == 4096) {
361 lci = 0;
362 break;
363 }
364 }
365
366 read_unlock_bh(&x25_list_lock);
367 return lci;
368 }
369
370 /*
371 * Deferred destroy.
372 */
373 static void __x25_destroy_socket(struct sock *);
374
375 /*
376 * handler for deferred kills.
377 */
378 static void x25_destroy_timer(unsigned long data)
379 {
380 x25_destroy_socket_from_timer((struct sock *)data);
381 }
382
383 /*
384 * This is called from user mode and the timers. Thus it protects itself
385 * against interrupt users but doesn't worry about being called during
386 * work. Once it is removed from the queue no interrupt or bottom half
387 * will touch it and we are (fairly 8-) ) safe.
388 * Not static as it's used by the timer
389 */
390 static void __x25_destroy_socket(struct sock *sk)
391 {
392 struct sk_buff *skb;
393
394 x25_stop_heartbeat(sk);
395 x25_stop_timer(sk);
396
397 x25_remove_socket(sk);
398 x25_clear_queues(sk); /* Flush the queues */
399
400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401 if (skb->sk != sk) { /* A pending connection */
402 /*
403 * Queue the unaccepted socket for death
404 */
405 skb->sk->sk_state = TCP_LISTEN;
406 sock_set_flag(skb->sk, SOCK_DEAD);
407 x25_start_heartbeat(skb->sk);
408 x25_sk(skb->sk)->state = X25_STATE_0;
409 }
410
411 kfree_skb(skb);
412 }
413
414 if (sk_has_allocations(sk)) {
415 /* Defer: outstanding buffers */
416 sk->sk_timer.expires = jiffies + 10 * HZ;
417 sk->sk_timer.function = x25_destroy_timer;
418 sk->sk_timer.data = (unsigned long)sk;
419 add_timer(&sk->sk_timer);
420 } else {
421 /* drop last reference so sock_put will free */
422 __sock_put(sk);
423 }
424 }
425
426 void x25_destroy_socket_from_timer(struct sock *sk)
427 {
428 sock_hold(sk);
429 bh_lock_sock(sk);
430 __x25_destroy_socket(sk);
431 bh_unlock_sock(sk);
432 sock_put(sk);
433 }
434
435 /*
436 * Handling for system calls applied via the various interfaces to a
437 * X.25 socket object.
438 */
439
440 static int x25_setsockopt(struct socket *sock, int level, int optname,
441 char __user *optval, unsigned int optlen)
442 {
443 int opt;
444 struct sock *sk = sock->sk;
445 int rc = -ENOPROTOOPT;
446
447 if (level != SOL_X25 || optname != X25_QBITINCL)
448 goto out;
449
450 rc = -EINVAL;
451 if (optlen < sizeof(int))
452 goto out;
453
454 rc = -EFAULT;
455 if (get_user(opt, (int __user *)optval))
456 goto out;
457
458 if (opt)
459 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460 else
461 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
462 rc = 0;
463 out:
464 return rc;
465 }
466
467 static int x25_getsockopt(struct socket *sock, int level, int optname,
468 char __user *optval, int __user *optlen)
469 {
470 struct sock *sk = sock->sk;
471 int val, len, rc = -ENOPROTOOPT;
472
473 if (level != SOL_X25 || optname != X25_QBITINCL)
474 goto out;
475
476 rc = -EFAULT;
477 if (get_user(len, optlen))
478 goto out;
479
480 len = min_t(unsigned int, len, sizeof(int));
481
482 rc = -EINVAL;
483 if (len < 0)
484 goto out;
485
486 rc = -EFAULT;
487 if (put_user(len, optlen))
488 goto out;
489
490 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
491 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
492 out:
493 return rc;
494 }
495
496 static int x25_listen(struct socket *sock, int backlog)
497 {
498 struct sock *sk = sock->sk;
499 int rc = -EOPNOTSUPP;
500
501 lock_sock(sk);
502 if (sk->sk_state != TCP_LISTEN) {
503 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
504 sk->sk_max_ack_backlog = backlog;
505 sk->sk_state = TCP_LISTEN;
506 rc = 0;
507 }
508 release_sock(sk);
509
510 return rc;
511 }
512
513 static struct proto x25_proto = {
514 .name = "X25",
515 .owner = THIS_MODULE,
516 .obj_size = sizeof(struct x25_sock),
517 };
518
519 static struct sock *x25_alloc_socket(struct net *net)
520 {
521 struct x25_sock *x25;
522 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
523
524 if (!sk)
525 goto out;
526
527 sock_init_data(NULL, sk);
528
529 x25 = x25_sk(sk);
530 skb_queue_head_init(&x25->ack_queue);
531 skb_queue_head_init(&x25->fragment_queue);
532 skb_queue_head_init(&x25->interrupt_in_queue);
533 skb_queue_head_init(&x25->interrupt_out_queue);
534 out:
535 return sk;
536 }
537
538 static int x25_create(struct net *net, struct socket *sock, int protocol,
539 int kern)
540 {
541 struct sock *sk;
542 struct x25_sock *x25;
543 int rc = -EAFNOSUPPORT;
544
545 if (!net_eq(net, &init_net))
546 goto out;
547
548 rc = -ESOCKTNOSUPPORT;
549 if (sock->type != SOCK_SEQPACKET)
550 goto out;
551
552 rc = -EINVAL;
553 if (protocol)
554 goto out;
555
556 rc = -ENOBUFS;
557 if ((sk = x25_alloc_socket(net)) == NULL)
558 goto out;
559
560 x25 = x25_sk(sk);
561
562 sock_init_data(sock, sk);
563
564 x25_init_timers(sk);
565
566 sock->ops = &x25_proto_ops;
567 sk->sk_protocol = protocol;
568 sk->sk_backlog_rcv = x25_backlog_rcv;
569
570 x25->t21 = sysctl_x25_call_request_timeout;
571 x25->t22 = sysctl_x25_reset_request_timeout;
572 x25->t23 = sysctl_x25_clear_request_timeout;
573 x25->t2 = sysctl_x25_ack_holdback_timeout;
574 x25->state = X25_STATE_0;
575 x25->cudmatchlength = 0;
576 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
577 /* on call accept */
578
579 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
580 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
581 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
582 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
583 x25->facilities.throughput = 0; /* by default don't negotiate
584 throughput */
585 x25->facilities.reverse = X25_DEFAULT_REVERSE;
586 x25->dte_facilities.calling_len = 0;
587 x25->dte_facilities.called_len = 0;
588 memset(x25->dte_facilities.called_ae, '\0',
589 sizeof(x25->dte_facilities.called_ae));
590 memset(x25->dte_facilities.calling_ae, '\0',
591 sizeof(x25->dte_facilities.calling_ae));
592
593 rc = 0;
594 out:
595 return rc;
596 }
597
598 static struct sock *x25_make_new(struct sock *osk)
599 {
600 struct sock *sk = NULL;
601 struct x25_sock *x25, *ox25;
602
603 if (osk->sk_type != SOCK_SEQPACKET)
604 goto out;
605
606 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
607 goto out;
608
609 x25 = x25_sk(sk);
610
611 sk->sk_type = osk->sk_type;
612 sk->sk_priority = osk->sk_priority;
613 sk->sk_protocol = osk->sk_protocol;
614 sk->sk_rcvbuf = osk->sk_rcvbuf;
615 sk->sk_sndbuf = osk->sk_sndbuf;
616 sk->sk_state = TCP_ESTABLISHED;
617 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
618 sock_copy_flags(sk, osk);
619
620 ox25 = x25_sk(osk);
621 x25->t21 = ox25->t21;
622 x25->t22 = ox25->t22;
623 x25->t23 = ox25->t23;
624 x25->t2 = ox25->t2;
625 x25->flags = ox25->flags;
626 x25->facilities = ox25->facilities;
627 x25->dte_facilities = ox25->dte_facilities;
628 x25->cudmatchlength = ox25->cudmatchlength;
629
630 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
631 x25_init_timers(sk);
632 out:
633 return sk;
634 }
635
636 static int x25_release(struct socket *sock)
637 {
638 struct sock *sk = sock->sk;
639 struct x25_sock *x25;
640
641 if (!sk)
642 return 0;
643
644 x25 = x25_sk(sk);
645
646 sock_hold(sk);
647 lock_sock(sk);
648 switch (x25->state) {
649
650 case X25_STATE_0:
651 case X25_STATE_2:
652 x25_disconnect(sk, 0, 0, 0);
653 __x25_destroy_socket(sk);
654 goto out;
655
656 case X25_STATE_1:
657 case X25_STATE_3:
658 case X25_STATE_4:
659 x25_clear_queues(sk);
660 x25_write_internal(sk, X25_CLEAR_REQUEST);
661 x25_start_t23timer(sk);
662 x25->state = X25_STATE_2;
663 sk->sk_state = TCP_CLOSE;
664 sk->sk_shutdown |= SEND_SHUTDOWN;
665 sk->sk_state_change(sk);
666 sock_set_flag(sk, SOCK_DEAD);
667 sock_set_flag(sk, SOCK_DESTROY);
668 break;
669 }
670
671 sock_orphan(sk);
672 out:
673 release_sock(sk);
674 sock_put(sk);
675 return 0;
676 }
677
678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
679 {
680 struct sock *sk = sock->sk;
681 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
682 int len, i, rc = 0;
683
684 if (!sock_flag(sk, SOCK_ZAPPED) ||
685 addr_len != sizeof(struct sockaddr_x25) ||
686 addr->sx25_family != AF_X25) {
687 rc = -EINVAL;
688 goto out;
689 }
690
691 len = strlen(addr->sx25_addr.x25_addr);
692 for (i = 0; i < len; i++) {
693 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
694 rc = -EINVAL;
695 goto out;
696 }
697 }
698
699 lock_sock(sk);
700 x25_sk(sk)->source_addr = addr->sx25_addr;
701 x25_insert_socket(sk);
702 sock_reset_flag(sk, SOCK_ZAPPED);
703 release_sock(sk);
704 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
705 out:
706 return rc;
707 }
708
709 static int x25_wait_for_connection_establishment(struct sock *sk)
710 {
711 DECLARE_WAITQUEUE(wait, current);
712 int rc;
713
714 add_wait_queue_exclusive(sk_sleep(sk), &wait);
715 for (;;) {
716 __set_current_state(TASK_INTERRUPTIBLE);
717 rc = -ERESTARTSYS;
718 if (signal_pending(current))
719 break;
720 rc = sock_error(sk);
721 if (rc) {
722 sk->sk_socket->state = SS_UNCONNECTED;
723 break;
724 }
725 rc = 0;
726 if (sk->sk_state != TCP_ESTABLISHED) {
727 release_sock(sk);
728 schedule();
729 lock_sock(sk);
730 } else
731 break;
732 }
733 __set_current_state(TASK_RUNNING);
734 remove_wait_queue(sk_sleep(sk), &wait);
735 return rc;
736 }
737
738 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739 int addr_len, int flags)
740 {
741 struct sock *sk = sock->sk;
742 struct x25_sock *x25 = x25_sk(sk);
743 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744 struct x25_route *rt;
745 int rc = 0;
746
747 lock_sock(sk);
748 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749 sock->state = SS_CONNECTED;
750 goto out; /* Connect completed during a ERESTARTSYS event */
751 }
752
753 rc = -ECONNREFUSED;
754 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755 sock->state = SS_UNCONNECTED;
756 goto out;
757 }
758
759 rc = -EISCONN; /* No reconnect on a seqpacket socket */
760 if (sk->sk_state == TCP_ESTABLISHED)
761 goto out;
762
763 sk->sk_state = TCP_CLOSE;
764 sock->state = SS_UNCONNECTED;
765
766 rc = -EINVAL;
767 if (addr_len != sizeof(struct sockaddr_x25) ||
768 addr->sx25_family != AF_X25)
769 goto out;
770
771 rc = -ENETUNREACH;
772 rt = x25_get_route(&addr->sx25_addr);
773 if (!rt)
774 goto out;
775
776 x25->neighbour = x25_get_neigh(rt->dev);
777 if (!x25->neighbour)
778 goto out_put_route;
779
780 x25_limit_facilities(&x25->facilities, x25->neighbour);
781
782 x25->lci = x25_new_lci(x25->neighbour);
783 if (!x25->lci)
784 goto out_put_neigh;
785
786 rc = -EINVAL;
787 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
788 goto out_put_neigh;
789
790 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
791 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
792
793 x25->dest_addr = addr->sx25_addr;
794
795 /* Move to connecting socket, start sending Connect Requests */
796 sock->state = SS_CONNECTING;
797 sk->sk_state = TCP_SYN_SENT;
798
799 x25->state = X25_STATE_1;
800
801 x25_write_internal(sk, X25_CALL_REQUEST);
802
803 x25_start_heartbeat(sk);
804 x25_start_t21timer(sk);
805
806 /* Now the loop */
807 rc = -EINPROGRESS;
808 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
809 goto out_put_neigh;
810
811 rc = x25_wait_for_connection_establishment(sk);
812 if (rc)
813 goto out_put_neigh;
814
815 sock->state = SS_CONNECTED;
816 rc = 0;
817 out_put_neigh:
818 if (rc)
819 x25_neigh_put(x25->neighbour);
820 out_put_route:
821 x25_route_put(rt);
822 out:
823 release_sock(sk);
824 return rc;
825 }
826
827 static int x25_wait_for_data(struct sock *sk, long timeout)
828 {
829 DECLARE_WAITQUEUE(wait, current);
830 int rc = 0;
831
832 add_wait_queue_exclusive(sk_sleep(sk), &wait);
833 for (;;) {
834 __set_current_state(TASK_INTERRUPTIBLE);
835 if (sk->sk_shutdown & RCV_SHUTDOWN)
836 break;
837 rc = -ERESTARTSYS;
838 if (signal_pending(current))
839 break;
840 rc = -EAGAIN;
841 if (!timeout)
842 break;
843 rc = 0;
844 if (skb_queue_empty(&sk->sk_receive_queue)) {
845 release_sock(sk);
846 timeout = schedule_timeout(timeout);
847 lock_sock(sk);
848 } else
849 break;
850 }
851 __set_current_state(TASK_RUNNING);
852 remove_wait_queue(sk_sleep(sk), &wait);
853 return rc;
854 }
855
856 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
857 {
858 struct sock *sk = sock->sk;
859 struct sock *newsk;
860 struct sk_buff *skb;
861 int rc = -EINVAL;
862
863 if (!sk)
864 goto out;
865
866 rc = -EOPNOTSUPP;
867 if (sk->sk_type != SOCK_SEQPACKET)
868 goto out;
869
870 lock_sock(sk);
871 rc = -EINVAL;
872 if (sk->sk_state != TCP_LISTEN)
873 goto out2;
874
875 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
876 if (rc)
877 goto out2;
878 skb = skb_dequeue(&sk->sk_receive_queue);
879 rc = -EINVAL;
880 if (!skb->sk)
881 goto out2;
882 newsk = skb->sk;
883 sock_graft(newsk, newsock);
884
885 /* Now attach up the new socket */
886 skb->sk = NULL;
887 kfree_skb(skb);
888 sk->sk_ack_backlog--;
889 newsock->state = SS_CONNECTED;
890 rc = 0;
891 out2:
892 release_sock(sk);
893 out:
894 return rc;
895 }
896
897 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
898 int *uaddr_len, int peer)
899 {
900 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
901 struct sock *sk = sock->sk;
902 struct x25_sock *x25 = x25_sk(sk);
903 int rc = 0;
904
905 if (peer) {
906 if (sk->sk_state != TCP_ESTABLISHED) {
907 rc = -ENOTCONN;
908 goto out;
909 }
910 sx25->sx25_addr = x25->dest_addr;
911 } else
912 sx25->sx25_addr = x25->source_addr;
913
914 sx25->sx25_family = AF_X25;
915 *uaddr_len = sizeof(*sx25);
916
917 out:
918 return rc;
919 }
920
921 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
922 unsigned int lci)
923 {
924 struct sock *sk;
925 struct sock *make;
926 struct x25_sock *makex25;
927 struct x25_address source_addr, dest_addr;
928 struct x25_facilities facilities;
929 struct x25_dte_facilities dte_facilities;
930 int len, addr_len, rc;
931
932 /*
933 * Remove the LCI and frame type.
934 */
935 skb_pull(skb, X25_STD_MIN_LEN);
936
937 /*
938 * Extract the X.25 addresses and convert them to ASCII strings,
939 * and remove them.
940 *
941 * Address block is mandatory in call request packets
942 */
943 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
944 if (addr_len <= 0)
945 goto out_clear_request;
946 skb_pull(skb, addr_len);
947
948 /*
949 * Get the length of the facilities, skip past them for the moment
950 * get the call user data because this is needed to determine
951 * the correct listener
952 *
953 * Facilities length is mandatory in call request packets
954 */
955 if (skb->len < 1)
956 goto out_clear_request;
957 len = skb->data[0] + 1;
958 if (skb->len < len)
959 goto out_clear_request;
960 skb_pull(skb,len);
961
962 /*
963 * Find a listener for the particular address/cud pair.
964 */
965 sk = x25_find_listener(&source_addr,skb);
966 skb_push(skb,len);
967
968 if (sk != NULL && sk_acceptq_is_full(sk)) {
969 goto out_sock_put;
970 }
971
972 /*
973 * We dont have any listeners for this incoming call.
974 * Try forwarding it.
975 */
976 if (sk == NULL) {
977 skb_push(skb, addr_len + X25_STD_MIN_LEN);
978 if (sysctl_x25_forward &&
979 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
980 {
981 /* Call was forwarded, dont process it any more */
982 kfree_skb(skb);
983 rc = 1;
984 goto out;
985 } else {
986 /* No listeners, can't forward, clear the call */
987 goto out_clear_request;
988 }
989 }
990
991 /*
992 * Try to reach a compromise on the requested facilities.
993 */
994 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
995 if (len == -1)
996 goto out_sock_put;
997
998 /*
999 * current neighbour/link might impose additional limits
1000 * on certain facilties
1001 */
1002
1003 x25_limit_facilities(&facilities, nb);
1004
1005 /*
1006 * Try to create a new socket.
1007 */
1008 make = x25_make_new(sk);
1009 if (!make)
1010 goto out_sock_put;
1011
1012 /*
1013 * Remove the facilities
1014 */
1015 skb_pull(skb, len);
1016
1017 skb->sk = make;
1018 make->sk_state = TCP_ESTABLISHED;
1019
1020 makex25 = x25_sk(make);
1021 makex25->lci = lci;
1022 makex25->dest_addr = dest_addr;
1023 makex25->source_addr = source_addr;
1024 makex25->neighbour = nb;
1025 makex25->facilities = facilities;
1026 makex25->dte_facilities= dte_facilities;
1027 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1028 /* ensure no reverse facil on accept */
1029 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1030 /* ensure no calling address extension on accept */
1031 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1032 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1033
1034 /* Normally all calls are accepted immediately */
1035 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1036 x25_write_internal(make, X25_CALL_ACCEPTED);
1037 makex25->state = X25_STATE_3;
1038 }
1039
1040 /*
1041 * Incoming Call User Data.
1042 */
1043 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1044 makex25->calluserdata.cudlength = skb->len;
1045
1046 sk->sk_ack_backlog++;
1047
1048 x25_insert_socket(make);
1049
1050 skb_queue_head(&sk->sk_receive_queue, skb);
1051
1052 x25_start_heartbeat(make);
1053
1054 if (!sock_flag(sk, SOCK_DEAD))
1055 sk->sk_data_ready(sk, skb->len);
1056 rc = 1;
1057 sock_put(sk);
1058 out:
1059 return rc;
1060 out_sock_put:
1061 sock_put(sk);
1062 out_clear_request:
1063 rc = 0;
1064 x25_transmit_clear_request(nb, lci, 0x01);
1065 goto out;
1066 }
1067
1068 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1069 struct msghdr *msg, size_t len)
1070 {
1071 struct sock *sk = sock->sk;
1072 struct x25_sock *x25 = x25_sk(sk);
1073 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1074 struct sockaddr_x25 sx25;
1075 struct sk_buff *skb;
1076 unsigned char *asmptr;
1077 int noblock = msg->msg_flags & MSG_DONTWAIT;
1078 size_t size;
1079 int qbit = 0, rc = -EINVAL;
1080
1081 lock_sock(sk);
1082 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1083 goto out;
1084
1085 /* we currently don't support segmented records at the user interface */
1086 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1087 goto out;
1088
1089 rc = -EADDRNOTAVAIL;
1090 if (sock_flag(sk, SOCK_ZAPPED))
1091 goto out;
1092
1093 rc = -EPIPE;
1094 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1095 send_sig(SIGPIPE, current, 0);
1096 goto out;
1097 }
1098
1099 rc = -ENETUNREACH;
1100 if (!x25->neighbour)
1101 goto out;
1102
1103 if (usx25) {
1104 rc = -EINVAL;
1105 if (msg->msg_namelen < sizeof(sx25))
1106 goto out;
1107 memcpy(&sx25, usx25, sizeof(sx25));
1108 rc = -EISCONN;
1109 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1110 goto out;
1111 rc = -EINVAL;
1112 if (sx25.sx25_family != AF_X25)
1113 goto out;
1114 } else {
1115 /*
1116 * FIXME 1003.1g - if the socket is like this because
1117 * it has become closed (not started closed) we ought
1118 * to SIGPIPE, EPIPE;
1119 */
1120 rc = -ENOTCONN;
1121 if (sk->sk_state != TCP_ESTABLISHED)
1122 goto out;
1123
1124 sx25.sx25_family = AF_X25;
1125 sx25.sx25_addr = x25->dest_addr;
1126 }
1127
1128 /* Sanity check the packet size */
1129 if (len > 65535) {
1130 rc = -EMSGSIZE;
1131 goto out;
1132 }
1133
1134 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1135
1136 /* Build a packet */
1137 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1138
1139 if ((msg->msg_flags & MSG_OOB) && len > 32)
1140 len = 32;
1141
1142 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1143
1144 release_sock(sk);
1145 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1146 lock_sock(sk);
1147 if (!skb)
1148 goto out;
1149 X25_SKB_CB(skb)->flags = msg->msg_flags;
1150
1151 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1152
1153 /*
1154 * Put the data on the end
1155 */
1156 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1157
1158 skb_reset_transport_header(skb);
1159 skb_put(skb, len);
1160
1161 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1162 if (rc)
1163 goto out_kfree_skb;
1164
1165 /*
1166 * If the Q BIT Include socket option is in force, the first
1167 * byte of the user data is the logical value of the Q Bit.
1168 */
1169 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1170 qbit = skb->data[0];
1171 skb_pull(skb, 1);
1172 }
1173
1174 /*
1175 * Push down the X.25 header
1176 */
1177 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1178
1179 if (msg->msg_flags & MSG_OOB) {
1180 if (x25->neighbour->extended) {
1181 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1182 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1183 *asmptr++ = (x25->lci >> 0) & 0xFF;
1184 *asmptr++ = X25_INTERRUPT;
1185 } else {
1186 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1187 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1188 *asmptr++ = (x25->lci >> 0) & 0xFF;
1189 *asmptr++ = X25_INTERRUPT;
1190 }
1191 } else {
1192 if (x25->neighbour->extended) {
1193 /* Build an Extended X.25 header */
1194 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1195 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1196 *asmptr++ = (x25->lci >> 0) & 0xFF;
1197 *asmptr++ = X25_DATA;
1198 *asmptr++ = X25_DATA;
1199 } else {
1200 /* Build an Standard X.25 header */
1201 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1202 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1203 *asmptr++ = (x25->lci >> 0) & 0xFF;
1204 *asmptr++ = X25_DATA;
1205 }
1206
1207 if (qbit)
1208 skb->data[0] |= X25_Q_BIT;
1209 }
1210
1211 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1212 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1213
1214 rc = -ENOTCONN;
1215 if (sk->sk_state != TCP_ESTABLISHED)
1216 goto out_kfree_skb;
1217
1218 if (msg->msg_flags & MSG_OOB)
1219 skb_queue_tail(&x25->interrupt_out_queue, skb);
1220 else {
1221 rc = x25_output(sk, skb);
1222 len = rc;
1223 if (rc < 0)
1224 kfree_skb(skb);
1225 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1226 len++;
1227 }
1228
1229 x25_kick(sk);
1230 rc = len;
1231 out:
1232 release_sock(sk);
1233 return rc;
1234 out_kfree_skb:
1235 kfree_skb(skb);
1236 goto out;
1237 }
1238
1239
1240 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1241 struct msghdr *msg, size_t size,
1242 int flags)
1243 {
1244 struct sock *sk = sock->sk;
1245 struct x25_sock *x25 = x25_sk(sk);
1246 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1247 size_t copied;
1248 int qbit;
1249 struct sk_buff *skb;
1250 unsigned char *asmptr;
1251 int rc = -ENOTCONN;
1252
1253 lock_sock(sk);
1254 /*
1255 * This works for seqpacket too. The receiver has ordered the queue for
1256 * us! We do one quick check first though
1257 */
1258 if (sk->sk_state != TCP_ESTABLISHED)
1259 goto out;
1260
1261 if (flags & MSG_OOB) {
1262 rc = -EINVAL;
1263 if (sock_flag(sk, SOCK_URGINLINE) ||
1264 !skb_peek(&x25->interrupt_in_queue))
1265 goto out;
1266
1267 skb = skb_dequeue(&x25->interrupt_in_queue);
1268
1269 skb_pull(skb, X25_STD_MIN_LEN);
1270
1271 /*
1272 * No Q bit information on Interrupt data.
1273 */
1274 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1275 asmptr = skb_push(skb, 1);
1276 *asmptr = 0x00;
1277 }
1278
1279 msg->msg_flags |= MSG_OOB;
1280 } else {
1281 /* Now we can treat all alike */
1282 release_sock(sk);
1283 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1284 flags & MSG_DONTWAIT, &rc);
1285 lock_sock(sk);
1286 if (!skb)
1287 goto out;
1288
1289 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1290
1291 skb_pull(skb, x25->neighbour->extended ?
1292 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1293
1294 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1295 asmptr = skb_push(skb, 1);
1296 *asmptr = qbit;
1297 }
1298 }
1299
1300 skb_reset_transport_header(skb);
1301 copied = skb->len;
1302
1303 if (copied > size) {
1304 copied = size;
1305 msg->msg_flags |= MSG_TRUNC;
1306 }
1307
1308 /* Currently, each datagram always contains a complete record */
1309 msg->msg_flags |= MSG_EOR;
1310
1311 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1312 if (rc)
1313 goto out_free_dgram;
1314
1315 if (sx25) {
1316 sx25->sx25_family = AF_X25;
1317 sx25->sx25_addr = x25->dest_addr;
1318 }
1319
1320 msg->msg_namelen = sizeof(struct sockaddr_x25);
1321
1322 x25_check_rbuf(sk);
1323 rc = copied;
1324 out_free_dgram:
1325 skb_free_datagram(sk, skb);
1326 out:
1327 release_sock(sk);
1328 return rc;
1329 }
1330
1331
1332 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1333 {
1334 struct sock *sk = sock->sk;
1335 struct x25_sock *x25 = x25_sk(sk);
1336 void __user *argp = (void __user *)arg;
1337 int rc;
1338
1339 switch (cmd) {
1340 case TIOCOUTQ: {
1341 int amount;
1342
1343 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1344 if (amount < 0)
1345 amount = 0;
1346 rc = put_user(amount, (unsigned int __user *)argp);
1347 break;
1348 }
1349
1350 case TIOCINQ: {
1351 struct sk_buff *skb;
1352 int amount = 0;
1353 /*
1354 * These two are safe on a single CPU system as
1355 * only user tasks fiddle here
1356 */
1357 lock_sock(sk);
1358 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1359 amount = skb->len;
1360 release_sock(sk);
1361 rc = put_user(amount, (unsigned int __user *)argp);
1362 break;
1363 }
1364
1365 case SIOCGSTAMP:
1366 rc = -EINVAL;
1367 if (sk)
1368 rc = sock_get_timestamp(sk,
1369 (struct timeval __user *)argp);
1370 break;
1371 case SIOCGSTAMPNS:
1372 rc = -EINVAL;
1373 if (sk)
1374 rc = sock_get_timestampns(sk,
1375 (struct timespec __user *)argp);
1376 break;
1377 case SIOCGIFADDR:
1378 case SIOCSIFADDR:
1379 case SIOCGIFDSTADDR:
1380 case SIOCSIFDSTADDR:
1381 case SIOCGIFBRDADDR:
1382 case SIOCSIFBRDADDR:
1383 case SIOCGIFNETMASK:
1384 case SIOCSIFNETMASK:
1385 case SIOCGIFMETRIC:
1386 case SIOCSIFMETRIC:
1387 rc = -EINVAL;
1388 break;
1389 case SIOCADDRT:
1390 case SIOCDELRT:
1391 rc = -EPERM;
1392 if (!capable(CAP_NET_ADMIN))
1393 break;
1394 rc = x25_route_ioctl(cmd, argp);
1395 break;
1396 case SIOCX25GSUBSCRIP:
1397 rc = x25_subscr_ioctl(cmd, argp);
1398 break;
1399 case SIOCX25SSUBSCRIP:
1400 rc = -EPERM;
1401 if (!capable(CAP_NET_ADMIN))
1402 break;
1403 rc = x25_subscr_ioctl(cmd, argp);
1404 break;
1405 case SIOCX25GFACILITIES: {
1406 lock_sock(sk);
1407 rc = copy_to_user(argp, &x25->facilities,
1408 sizeof(x25->facilities))
1409 ? -EFAULT : 0;
1410 release_sock(sk);
1411 break;
1412 }
1413
1414 case SIOCX25SFACILITIES: {
1415 struct x25_facilities facilities;
1416 rc = -EFAULT;
1417 if (copy_from_user(&facilities, argp,
1418 sizeof(facilities)))
1419 break;
1420 rc = -EINVAL;
1421 lock_sock(sk);
1422 if (sk->sk_state != TCP_LISTEN &&
1423 sk->sk_state != TCP_CLOSE)
1424 goto out_fac_release;
1425 if (facilities.pacsize_in < X25_PS16 ||
1426 facilities.pacsize_in > X25_PS4096)
1427 goto out_fac_release;
1428 if (facilities.pacsize_out < X25_PS16 ||
1429 facilities.pacsize_out > X25_PS4096)
1430 goto out_fac_release;
1431 if (facilities.winsize_in < 1 ||
1432 facilities.winsize_in > 127)
1433 goto out_fac_release;
1434 if (facilities.throughput) {
1435 int out = facilities.throughput & 0xf0;
1436 int in = facilities.throughput & 0x0f;
1437 if (!out)
1438 facilities.throughput |=
1439 X25_DEFAULT_THROUGHPUT << 4;
1440 else if (out < 0x30 || out > 0xD0)
1441 goto out_fac_release;
1442 if (!in)
1443 facilities.throughput |=
1444 X25_DEFAULT_THROUGHPUT;
1445 else if (in < 0x03 || in > 0x0D)
1446 goto out_fac_release;
1447 }
1448 if (facilities.reverse &&
1449 (facilities.reverse & 0x81) != 0x81)
1450 goto out_fac_release;
1451 x25->facilities = facilities;
1452 rc = 0;
1453 out_fac_release:
1454 release_sock(sk);
1455 break;
1456 }
1457
1458 case SIOCX25GDTEFACILITIES: {
1459 lock_sock(sk);
1460 rc = copy_to_user(argp, &x25->dte_facilities,
1461 sizeof(x25->dte_facilities));
1462 release_sock(sk);
1463 if (rc)
1464 rc = -EFAULT;
1465 break;
1466 }
1467
1468 case SIOCX25SDTEFACILITIES: {
1469 struct x25_dte_facilities dtefacs;
1470 rc = -EFAULT;
1471 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1472 break;
1473 rc = -EINVAL;
1474 lock_sock(sk);
1475 if (sk->sk_state != TCP_LISTEN &&
1476 sk->sk_state != TCP_CLOSE)
1477 goto out_dtefac_release;
1478 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1479 goto out_dtefac_release;
1480 if (dtefacs.calling_ae == NULL)
1481 goto out_dtefac_release;
1482 if (dtefacs.called_len > X25_MAX_AE_LEN)
1483 goto out_dtefac_release;
1484 if (dtefacs.called_ae == NULL)
1485 goto out_dtefac_release;
1486 x25->dte_facilities = dtefacs;
1487 rc = 0;
1488 out_dtefac_release:
1489 release_sock(sk);
1490 break;
1491 }
1492
1493 case SIOCX25GCALLUSERDATA: {
1494 lock_sock(sk);
1495 rc = copy_to_user(argp, &x25->calluserdata,
1496 sizeof(x25->calluserdata))
1497 ? -EFAULT : 0;
1498 release_sock(sk);
1499 break;
1500 }
1501
1502 case SIOCX25SCALLUSERDATA: {
1503 struct x25_calluserdata calluserdata;
1504
1505 rc = -EFAULT;
1506 if (copy_from_user(&calluserdata, argp,
1507 sizeof(calluserdata)))
1508 break;
1509 rc = -EINVAL;
1510 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1511 break;
1512 lock_sock(sk);
1513 x25->calluserdata = calluserdata;
1514 release_sock(sk);
1515 rc = 0;
1516 break;
1517 }
1518
1519 case SIOCX25GCAUSEDIAG: {
1520 lock_sock(sk);
1521 rc = copy_to_user(argp, &x25->causediag,
1522 sizeof(x25->causediag))
1523 ? -EFAULT : 0;
1524 release_sock(sk);
1525 break;
1526 }
1527
1528 case SIOCX25SCAUSEDIAG: {
1529 struct x25_causediag causediag;
1530 rc = -EFAULT;
1531 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1532 break;
1533 lock_sock(sk);
1534 x25->causediag = causediag;
1535 release_sock(sk);
1536 rc = 0;
1537 break;
1538
1539 }
1540
1541 case SIOCX25SCUDMATCHLEN: {
1542 struct x25_subaddr sub_addr;
1543 rc = -EINVAL;
1544 lock_sock(sk);
1545 if(sk->sk_state != TCP_CLOSE)
1546 goto out_cud_release;
1547 rc = -EFAULT;
1548 if (copy_from_user(&sub_addr, argp,
1549 sizeof(sub_addr)))
1550 goto out_cud_release;
1551 rc = -EINVAL;
1552 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1553 goto out_cud_release;
1554 x25->cudmatchlength = sub_addr.cudmatchlength;
1555 rc = 0;
1556 out_cud_release:
1557 release_sock(sk);
1558 break;
1559 }
1560
1561 case SIOCX25CALLACCPTAPPRV: {
1562 rc = -EINVAL;
1563 lock_sock(sk);
1564 if (sk->sk_state != TCP_CLOSE)
1565 break;
1566 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1567 release_sock(sk);
1568 rc = 0;
1569 break;
1570 }
1571
1572 case SIOCX25SENDCALLACCPT: {
1573 rc = -EINVAL;
1574 lock_sock(sk);
1575 if (sk->sk_state != TCP_ESTABLISHED)
1576 break;
1577 /* must call accptapprv above */
1578 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1579 break;
1580 x25_write_internal(sk, X25_CALL_ACCEPTED);
1581 x25->state = X25_STATE_3;
1582 release_sock(sk);
1583 rc = 0;
1584 break;
1585 }
1586
1587 default:
1588 rc = -ENOIOCTLCMD;
1589 break;
1590 }
1591
1592 return rc;
1593 }
1594
1595 static const struct net_proto_family x25_family_ops = {
1596 .family = AF_X25,
1597 .create = x25_create,
1598 .owner = THIS_MODULE,
1599 };
1600
1601 #ifdef CONFIG_COMPAT
1602 static int compat_x25_subscr_ioctl(unsigned int cmd,
1603 struct compat_x25_subscrip_struct __user *x25_subscr32)
1604 {
1605 struct compat_x25_subscrip_struct x25_subscr;
1606 struct x25_neigh *nb;
1607 struct net_device *dev;
1608 int rc = -EINVAL;
1609
1610 rc = -EFAULT;
1611 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1612 goto out;
1613
1614 rc = -EINVAL;
1615 dev = x25_dev_get(x25_subscr.device);
1616 if (dev == NULL)
1617 goto out;
1618
1619 nb = x25_get_neigh(dev);
1620 if (nb == NULL)
1621 goto out_dev_put;
1622
1623 dev_put(dev);
1624
1625 if (cmd == SIOCX25GSUBSCRIP) {
1626 read_lock_bh(&x25_neigh_list_lock);
1627 x25_subscr.extended = nb->extended;
1628 x25_subscr.global_facil_mask = nb->global_facil_mask;
1629 read_unlock_bh(&x25_neigh_list_lock);
1630 rc = copy_to_user(x25_subscr32, &x25_subscr,
1631 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1632 } else {
1633 rc = -EINVAL;
1634 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1635 rc = 0;
1636 write_lock_bh(&x25_neigh_list_lock);
1637 nb->extended = x25_subscr.extended;
1638 nb->global_facil_mask = x25_subscr.global_facil_mask;
1639 write_unlock_bh(&x25_neigh_list_lock);
1640 }
1641 }
1642 x25_neigh_put(nb);
1643 out:
1644 return rc;
1645 out_dev_put:
1646 dev_put(dev);
1647 goto out;
1648 }
1649
1650 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1651 unsigned long arg)
1652 {
1653 void __user *argp = compat_ptr(arg);
1654 struct sock *sk = sock->sk;
1655
1656 int rc = -ENOIOCTLCMD;
1657
1658 switch(cmd) {
1659 case TIOCOUTQ:
1660 case TIOCINQ:
1661 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1662 break;
1663 case SIOCGSTAMP:
1664 rc = -EINVAL;
1665 if (sk)
1666 rc = compat_sock_get_timestamp(sk,
1667 (struct timeval __user*)argp);
1668 break;
1669 case SIOCGSTAMPNS:
1670 rc = -EINVAL;
1671 if (sk)
1672 rc = compat_sock_get_timestampns(sk,
1673 (struct timespec __user*)argp);
1674 break;
1675 case SIOCGIFADDR:
1676 case SIOCSIFADDR:
1677 case SIOCGIFDSTADDR:
1678 case SIOCSIFDSTADDR:
1679 case SIOCGIFBRDADDR:
1680 case SIOCSIFBRDADDR:
1681 case SIOCGIFNETMASK:
1682 case SIOCSIFNETMASK:
1683 case SIOCGIFMETRIC:
1684 case SIOCSIFMETRIC:
1685 rc = -EINVAL;
1686 break;
1687 case SIOCADDRT:
1688 case SIOCDELRT:
1689 rc = -EPERM;
1690 if (!capable(CAP_NET_ADMIN))
1691 break;
1692 rc = x25_route_ioctl(cmd, argp);
1693 break;
1694 case SIOCX25GSUBSCRIP:
1695 rc = compat_x25_subscr_ioctl(cmd, argp);
1696 break;
1697 case SIOCX25SSUBSCRIP:
1698 rc = -EPERM;
1699 if (!capable(CAP_NET_ADMIN))
1700 break;
1701 rc = compat_x25_subscr_ioctl(cmd, argp);
1702 break;
1703 case SIOCX25GFACILITIES:
1704 case SIOCX25SFACILITIES:
1705 case SIOCX25GDTEFACILITIES:
1706 case SIOCX25SDTEFACILITIES:
1707 case SIOCX25GCALLUSERDATA:
1708 case SIOCX25SCALLUSERDATA:
1709 case SIOCX25GCAUSEDIAG:
1710 case SIOCX25SCAUSEDIAG:
1711 case SIOCX25SCUDMATCHLEN:
1712 case SIOCX25CALLACCPTAPPRV:
1713 case SIOCX25SENDCALLACCPT:
1714 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1715 break;
1716 default:
1717 rc = -ENOIOCTLCMD;
1718 break;
1719 }
1720 return rc;
1721 }
1722 #endif
1723
1724 static const struct proto_ops x25_proto_ops = {
1725 .family = AF_X25,
1726 .owner = THIS_MODULE,
1727 .release = x25_release,
1728 .bind = x25_bind,
1729 .connect = x25_connect,
1730 .socketpair = sock_no_socketpair,
1731 .accept = x25_accept,
1732 .getname = x25_getname,
1733 .poll = datagram_poll,
1734 .ioctl = x25_ioctl,
1735 #ifdef CONFIG_COMPAT
1736 .compat_ioctl = compat_x25_ioctl,
1737 #endif
1738 .listen = x25_listen,
1739 .shutdown = sock_no_shutdown,
1740 .setsockopt = x25_setsockopt,
1741 .getsockopt = x25_getsockopt,
1742 .sendmsg = x25_sendmsg,
1743 .recvmsg = x25_recvmsg,
1744 .mmap = sock_no_mmap,
1745 .sendpage = sock_no_sendpage,
1746 };
1747
1748 static struct packet_type x25_packet_type __read_mostly = {
1749 .type = cpu_to_be16(ETH_P_X25),
1750 .func = x25_lapb_receive_frame,
1751 };
1752
1753 static struct notifier_block x25_dev_notifier = {
1754 .notifier_call = x25_device_event,
1755 };
1756
1757 void x25_kill_by_neigh(struct x25_neigh *nb)
1758 {
1759 struct sock *s;
1760 struct hlist_node *node;
1761
1762 write_lock_bh(&x25_list_lock);
1763
1764 sk_for_each(s, node, &x25_list)
1765 if (x25_sk(s)->neighbour == nb)
1766 x25_disconnect(s, ENETUNREACH, 0, 0);
1767
1768 write_unlock_bh(&x25_list_lock);
1769
1770 /* Remove any related forwards */
1771 x25_clear_forward_by_dev(nb->dev);
1772 }
1773
1774 static int __init x25_init(void)
1775 {
1776 int rc = proto_register(&x25_proto, 0);
1777
1778 if (rc != 0)
1779 goto out;
1780
1781 rc = sock_register(&x25_family_ops);
1782 if (rc != 0)
1783 goto out_proto;
1784
1785 dev_add_pack(&x25_packet_type);
1786
1787 rc = register_netdevice_notifier(&x25_dev_notifier);
1788 if (rc != 0)
1789 goto out_sock;
1790
1791 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1792
1793 x25_register_sysctl();
1794 rc = x25_proc_init();
1795 if (rc != 0)
1796 goto out_dev;
1797 out:
1798 return rc;
1799 out_dev:
1800 unregister_netdevice_notifier(&x25_dev_notifier);
1801 out_sock:
1802 sock_unregister(AF_X25);
1803 out_proto:
1804 proto_unregister(&x25_proto);
1805 goto out;
1806 }
1807 module_init(x25_init);
1808
1809 static void __exit x25_exit(void)
1810 {
1811 x25_proc_exit();
1812 x25_link_free();
1813 x25_route_free();
1814
1815 x25_unregister_sysctl();
1816
1817 unregister_netdevice_notifier(&x25_dev_notifier);
1818
1819 dev_remove_pack(&x25_packet_type);
1820
1821 sock_unregister(AF_X25);
1822 proto_unregister(&x25_proto);
1823 }
1824 module_exit(x25_exit);
1825
1826 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1827 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1828 MODULE_LICENSE("GPL");
1829 MODULE_ALIAS_NETPROTO(PF_X25);
Linux with added FPC-III support