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Linux-2.6.12-rc2
[linux-2.6/kvm.git] / net / x25 / af_x25.c
blob2a24b243b841aaae6e734c102aaae25f4cae762f
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 */
33
34 #include <linux/config.h>
35 #include <linux/module.h>
36 #include <linux/errno.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/timer.h>
40 #include <linux/string.h>
41 #include <linux/net.h>
42 #include <linux/netdevice.h>
43 #include <linux/if_arp.h>
44 #include <linux/skbuff.h>
45 #include <net/sock.h>
46 #include <net/tcp.h>
47 #include <asm/uaccess.h>
48 #include <linux/fcntl.h>
49 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
50 #include <linux/notifier.h>
51 #include <linux/init.h>
52 #include <net/x25.h>
53
54 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
55 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
56 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
57 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
58 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
59
60 HLIST_HEAD(x25_list);
61 DEFINE_RWLOCK(x25_list_lock);
62
63 static struct proto_ops x25_proto_ops;
64
65 static struct x25_address null_x25_address = {" "};
66
67 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
68 struct x25_address *calling_addr)
69 {
70 int called_len, calling_len;
71 char *called, *calling;
72 int i;
73
74 called_len = (*p >> 0) & 0x0F;
75 calling_len = (*p >> 4) & 0x0F;
76
77 called = called_addr->x25_addr;
78 calling = calling_addr->x25_addr;
79 p++;
80
81 for (i = 0; i < (called_len + calling_len); i++) {
82 if (i < called_len) {
83 if (i % 2 != 0) {
84 *called++ = ((*p >> 0) & 0x0F) + '0';
85 p++;
86 } else {
87 *called++ = ((*p >> 4) & 0x0F) + '0';
88 }
89 } else {
90 if (i % 2 != 0) {
91 *calling++ = ((*p >> 0) & 0x0F) + '0';
92 p++;
93 } else {
94 *calling++ = ((*p >> 4) & 0x0F) + '0';
95 }
96 }
97 }
98
99 *called = *calling = '\0';
100
101 return 1 + (called_len + calling_len + 1) / 2;
102 }
103
104 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
105 struct x25_address *calling_addr)
106 {
107 unsigned int called_len, calling_len;
108 char *called, *calling;
109 int i;
110
111 called = called_addr->x25_addr;
112 calling = calling_addr->x25_addr;
113
114 called_len = strlen(called);
115 calling_len = strlen(calling);
116
117 *p++ = (calling_len << 4) | (called_len << 0);
118
119 for (i = 0; i < (called_len + calling_len); i++) {
120 if (i < called_len) {
121 if (i % 2 != 0) {
122 *p |= (*called++ - '0') << 0;
123 p++;
124 } else {
125 *p = 0x00;
126 *p |= (*called++ - '0') << 4;
127 }
128 } else {
129 if (i % 2 != 0) {
130 *p |= (*calling++ - '0') << 0;
131 p++;
132 } else {
133 *p = 0x00;
134 *p |= (*calling++ - '0') << 4;
135 }
136 }
137 }
138
139 return 1 + (called_len + calling_len + 1) / 2;
140 }
141
142 /*
143 * Socket removal during an interrupt is now safe.
144 */
145 static void x25_remove_socket(struct sock *sk)
146 {
147 write_lock_bh(&x25_list_lock);
148 sk_del_node_init(sk);
149 write_unlock_bh(&x25_list_lock);
150 }
151
152 /*
153 * Kill all bound sockets on a dropped device.
154 */
155 static void x25_kill_by_device(struct net_device *dev)
156 {
157 struct sock *s;
158 struct hlist_node *node;
159
160 write_lock_bh(&x25_list_lock);
161
162 sk_for_each(s, node, &x25_list)
163 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
164 x25_disconnect(s, ENETUNREACH, 0, 0);
165
166 write_unlock_bh(&x25_list_lock);
167 }
168
169 /*
170 * Handle device status changes.
171 */
172 static int x25_device_event(struct notifier_block *this, unsigned long event,
173 void *ptr)
174 {
175 struct net_device *dev = ptr;
176 struct x25_neigh *nb;
177
178 if (dev->type == ARPHRD_X25
179 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
180 || dev->type == ARPHRD_ETHER
181 #endif
182 ) {
183 switch (event) {
184 case NETDEV_UP:
185 x25_link_device_up(dev);
186 break;
187 case NETDEV_GOING_DOWN:
188 nb = x25_get_neigh(dev);
189 if (nb) {
190 x25_terminate_link(nb);
191 x25_neigh_put(nb);
192 }
193 break;
194 case NETDEV_DOWN:
195 x25_kill_by_device(dev);
196 x25_route_device_down(dev);
197 x25_link_device_down(dev);
198 break;
199 }
200 }
201
202 return NOTIFY_DONE;
203 }
204
205 /*
206 * Add a socket to the bound sockets list.
207 */
208 static void x25_insert_socket(struct sock *sk)
209 {
210 write_lock_bh(&x25_list_lock);
211 sk_add_node(sk, &x25_list);
212 write_unlock_bh(&x25_list_lock);
213 }
214
215 /*
216 * Find a socket that wants to accept the Call Request we just
217 * received. Check the full list for an address/cud match.
218 * If no cuds match return the next_best thing, an address match.
219 * Note: if a listening socket has cud set it must only get calls
220 * with matching cud.
221 */
222 static struct sock *x25_find_listener(struct x25_address *addr, struct x25_calluserdata *calluserdata)
223 {
224 struct sock *s;
225 struct sock *next_best;
226 struct hlist_node *node;
227
228 read_lock_bh(&x25_list_lock);
229 next_best = NULL;
230
231 sk_for_each(s, node, &x25_list)
232 if ((!strcmp(addr->x25_addr,
233 x25_sk(s)->source_addr.x25_addr) ||
234 !strcmp(addr->x25_addr,
235 null_x25_address.x25_addr)) &&
236 s->sk_state == TCP_LISTEN) {
237
238 /*
239 * Found a listening socket, now check the incoming
240 * call user data vs this sockets call user data
241 */
242 if (x25_check_calluserdata(&x25_sk(s)->calluserdata, calluserdata)) {
243 sock_hold(s);
244 goto found;
245 }
246 if (x25_sk(s)->calluserdata.cudlength == 0) {
247 next_best = s;
248 }
249 }
250 if (next_best) {
251 s = next_best;
252 sock_hold(s);
253 goto found;
254 }
255 s = NULL;
256 found:
257 read_unlock_bh(&x25_list_lock);
258 return s;
259 }
260
261 /*
262 * Find a connected X.25 socket given my LCI and neighbour.
263 */
264 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
265 {
266 struct sock *s;
267 struct hlist_node *node;
268
269 sk_for_each(s, node, &x25_list)
270 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
271 sock_hold(s);
272 goto found;
273 }
274 s = NULL;
275 found:
276 return s;
277 }
278
279 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
280 {
281 struct sock *s;
282
283 read_lock_bh(&x25_list_lock);
284 s = __x25_find_socket(lci, nb);
285 read_unlock_bh(&x25_list_lock);
286 return s;
287 }
288
289 /*
290 * Find a unique LCI for a given device.
291 */
292 static unsigned int x25_new_lci(struct x25_neigh *nb)
293 {
294 unsigned int lci = 1;
295 struct sock *sk;
296
297 read_lock_bh(&x25_list_lock);
298
299 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
300 sock_put(sk);
301 if (++lci == 4096) {
302 lci = 0;
303 break;
304 }
305 }
306
307 read_unlock_bh(&x25_list_lock);
308 return lci;
309 }
310
311 /*
312 * Deferred destroy.
313 */
314 void x25_destroy_socket(struct sock *);
315
316 /*
317 * handler for deferred kills.
318 */
319 static void x25_destroy_timer(unsigned long data)
320 {
321 x25_destroy_socket((struct sock *)data);
322 }
323
324 /*
325 * This is called from user mode and the timers. Thus it protects itself
326 * against interrupt users but doesn't worry about being called during
327 * work. Once it is removed from the queue no interrupt or bottom half
328 * will touch it and we are (fairly 8-) ) safe.
329 * Not static as it's used by the timer
330 */
331 void x25_destroy_socket(struct sock *sk)
332 {
333 struct sk_buff *skb;
334
335 sock_hold(sk);
336 lock_sock(sk);
337 x25_stop_heartbeat(sk);
338 x25_stop_timer(sk);
339
340 x25_remove_socket(sk);
341 x25_clear_queues(sk); /* Flush the queues */
342
343 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
344 if (skb->sk != sk) { /* A pending connection */
345 /*
346 * Queue the unaccepted socket for death
347 */
348 sock_set_flag(skb->sk, SOCK_DEAD);
349 x25_start_heartbeat(skb->sk);
350 x25_sk(skb->sk)->state = X25_STATE_0;
351 }
352
353 kfree_skb(skb);
354 }
355
356 if (atomic_read(&sk->sk_wmem_alloc) ||
357 atomic_read(&sk->sk_rmem_alloc)) {
358 /* Defer: outstanding buffers */
359 sk->sk_timer.expires = jiffies + 10 * HZ;
360 sk->sk_timer.function = x25_destroy_timer;
361 sk->sk_timer.data = (unsigned long)sk;
362 add_timer(&sk->sk_timer);
363 } else {
364 /* drop last reference so sock_put will free */
365 __sock_put(sk);
366 }
367
368 release_sock(sk);
369 sock_put(sk);
370 }
371
372 /*
373 * Handling for system calls applied via the various interfaces to a
374 * X.25 socket object.
375 */
376
377 static int x25_setsockopt(struct socket *sock, int level, int optname,
378 char __user *optval, int optlen)
379 {
380 int opt;
381 struct sock *sk = sock->sk;
382 int rc = -ENOPROTOOPT;
383
384 if (level != SOL_X25 || optname != X25_QBITINCL)
385 goto out;
386
387 rc = -EINVAL;
388 if (optlen < sizeof(int))
389 goto out;
390
391 rc = -EFAULT;
392 if (get_user(opt, (int __user *)optval))
393 goto out;
394
395 x25_sk(sk)->qbitincl = !!opt;
396 rc = 0;
397 out:
398 return rc;
399 }
400
401 static int x25_getsockopt(struct socket *sock, int level, int optname,
402 char __user *optval, int __user *optlen)
403 {
404 struct sock *sk = sock->sk;
405 int val, len, rc = -ENOPROTOOPT;
406
407 if (level != SOL_X25 || optname != X25_QBITINCL)
408 goto out;
409
410 rc = -EFAULT;
411 if (get_user(len, optlen))
412 goto out;
413
414 len = min_t(unsigned int, len, sizeof(int));
415
416 rc = -EINVAL;
417 if (len < 0)
418 goto out;
419
420 rc = -EFAULT;
421 if (put_user(len, optlen))
422 goto out;
423
424 val = x25_sk(sk)->qbitincl;
425 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
426 out:
427 return rc;
428 }
429
430 static int x25_listen(struct socket *sock, int backlog)
431 {
432 struct sock *sk = sock->sk;
433 int rc = -EOPNOTSUPP;
434
435 if (sk->sk_state != TCP_LISTEN) {
436 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
437 sk->sk_max_ack_backlog = backlog;
438 sk->sk_state = TCP_LISTEN;
439 rc = 0;
440 }
441
442 return rc;
443 }
444
445 static struct proto x25_proto = {
446 .name = "X25",
447 .owner = THIS_MODULE,
448 .obj_size = sizeof(struct x25_sock),
449 };
450
451 static struct sock *x25_alloc_socket(void)
452 {
453 struct x25_sock *x25;
454 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
455
456 if (!sk)
457 goto out;
458
459 sock_init_data(NULL, sk);
460
461 x25 = x25_sk(sk);
462 skb_queue_head_init(&x25->ack_queue);
463 skb_queue_head_init(&x25->fragment_queue);
464 skb_queue_head_init(&x25->interrupt_in_queue);
465 skb_queue_head_init(&x25->interrupt_out_queue);
466 out:
467 return sk;
468 }
469
470 void x25_init_timers(struct sock *sk);
471
472 static int x25_create(struct socket *sock, int protocol)
473 {
474 struct sock *sk;
475 struct x25_sock *x25;
476 int rc = -ESOCKTNOSUPPORT;
477
478 if (sock->type != SOCK_SEQPACKET || protocol)
479 goto out;
480
481 rc = -ENOMEM;
482 if ((sk = x25_alloc_socket()) == NULL)
483 goto out;
484
485 x25 = x25_sk(sk);
486
487 sock_init_data(sock, sk);
488
489 x25_init_timers(sk);
490
491 sock->ops = &x25_proto_ops;
492 sk->sk_protocol = protocol;
493 sk->sk_backlog_rcv = x25_backlog_rcv;
494
495 x25->t21 = sysctl_x25_call_request_timeout;
496 x25->t22 = sysctl_x25_reset_request_timeout;
497 x25->t23 = sysctl_x25_clear_request_timeout;
498 x25->t2 = sysctl_x25_ack_holdback_timeout;
499 x25->state = X25_STATE_0;
500
501 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
502 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
503 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
504 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
505 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
506 x25->facilities.reverse = X25_DEFAULT_REVERSE;
507 rc = 0;
508 out:
509 return rc;
510 }
511
512 static struct sock *x25_make_new(struct sock *osk)
513 {
514 struct sock *sk = NULL;
515 struct x25_sock *x25, *ox25;
516
517 if (osk->sk_type != SOCK_SEQPACKET)
518 goto out;
519
520 if ((sk = x25_alloc_socket()) == NULL)
521 goto out;
522
523 x25 = x25_sk(sk);
524
525 sk->sk_type = osk->sk_type;
526 sk->sk_socket = osk->sk_socket;
527 sk->sk_priority = osk->sk_priority;
528 sk->sk_protocol = osk->sk_protocol;
529 sk->sk_rcvbuf = osk->sk_rcvbuf;
530 sk->sk_sndbuf = osk->sk_sndbuf;
531 sk->sk_state = TCP_ESTABLISHED;
532 sk->sk_sleep = osk->sk_sleep;
533 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
534
535 if (sock_flag(osk, SOCK_ZAPPED))
536 sock_set_flag(sk, SOCK_ZAPPED);
537
538 if (sock_flag(osk, SOCK_DBG))
539 sock_set_flag(sk, SOCK_DBG);
540
541 ox25 = x25_sk(osk);
542 x25->t21 = ox25->t21;
543 x25->t22 = ox25->t22;
544 x25->t23 = ox25->t23;
545 x25->t2 = ox25->t2;
546 x25->facilities = ox25->facilities;
547 x25->qbitincl = ox25->qbitincl;
548
549 x25_init_timers(sk);
550 out:
551 return sk;
552 }
553
554 static int x25_release(struct socket *sock)
555 {
556 struct sock *sk = sock->sk;
557 struct x25_sock *x25;
558
559 if (!sk)
560 goto out;
561
562 x25 = x25_sk(sk);
563
564 switch (x25->state) {
565
566 case X25_STATE_0:
567 case X25_STATE_2:
568 x25_disconnect(sk, 0, 0, 0);
569 x25_destroy_socket(sk);
570 goto out;
571
572 case X25_STATE_1:
573 case X25_STATE_3:
574 case X25_STATE_4:
575 x25_clear_queues(sk);
576 x25_write_internal(sk, X25_CLEAR_REQUEST);
577 x25_start_t23timer(sk);
578 x25->state = X25_STATE_2;
579 sk->sk_state = TCP_CLOSE;
580 sk->sk_shutdown |= SEND_SHUTDOWN;
581 sk->sk_state_change(sk);
582 sock_set_flag(sk, SOCK_DEAD);
583 sock_set_flag(sk, SOCK_DESTROY);
584 break;
585 }
586
587 sock->sk = NULL;
588 sk->sk_socket = NULL; /* Not used, but we should do this */
589 out:
590 return 0;
591 }
592
593 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
594 {
595 struct sock *sk = sock->sk;
596 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
597
598 if (!sock_flag(sk, SOCK_ZAPPED) ||
599 addr_len != sizeof(struct sockaddr_x25) ||
600 addr->sx25_family != AF_X25)
601 return -EINVAL;
602
603 x25_sk(sk)->source_addr = addr->sx25_addr;
604 x25_insert_socket(sk);
605 sock_reset_flag(sk, SOCK_ZAPPED);
606 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
607
608 return 0;
609 }
610
611 static int x25_wait_for_connection_establishment(struct sock *sk)
612 {
613 DECLARE_WAITQUEUE(wait, current);
614 int rc;
615
616 add_wait_queue_exclusive(sk->sk_sleep, &wait);
617 for (;;) {
618 __set_current_state(TASK_INTERRUPTIBLE);
619 rc = -ERESTARTSYS;
620 if (signal_pending(current))
621 break;
622 rc = sock_error(sk);
623 if (rc) {
624 sk->sk_socket->state = SS_UNCONNECTED;
625 break;
626 }
627 rc = 0;
628 if (sk->sk_state != TCP_ESTABLISHED) {
629 release_sock(sk);
630 schedule();
631 lock_sock(sk);
632 } else
633 break;
634 }
635 __set_current_state(TASK_RUNNING);
636 remove_wait_queue(sk->sk_sleep, &wait);
637 return rc;
638 }
639
640 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
641 int addr_len, int flags)
642 {
643 struct sock *sk = sock->sk;
644 struct x25_sock *x25 = x25_sk(sk);
645 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
646 struct x25_route *rt;
647 int rc = 0;
648
649 lock_sock(sk);
650 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
651 sock->state = SS_CONNECTED;
652 goto out; /* Connect completed during a ERESTARTSYS event */
653 }
654
655 rc = -ECONNREFUSED;
656 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
657 sock->state = SS_UNCONNECTED;
658 goto out;
659 }
660
661 rc = -EISCONN; /* No reconnect on a seqpacket socket */
662 if (sk->sk_state == TCP_ESTABLISHED)
663 goto out;
664
665 sk->sk_state = TCP_CLOSE;
666 sock->state = SS_UNCONNECTED;
667
668 rc = -EINVAL;
669 if (addr_len != sizeof(struct sockaddr_x25) ||
670 addr->sx25_family != AF_X25)
671 goto out;
672
673 rc = -ENETUNREACH;
674 rt = x25_get_route(&addr->sx25_addr);
675 if (!rt)
676 goto out;
677
678 x25->neighbour = x25_get_neigh(rt->dev);
679 if (!x25->neighbour)
680 goto out_put_route;
681
682 x25_limit_facilities(&x25->facilities, x25->neighbour);
683
684 x25->lci = x25_new_lci(x25->neighbour);
685 if (!x25->lci)
686 goto out_put_neigh;
687
688 rc = -EINVAL;
689 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
690 goto out_put_neigh;
691
692 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
693 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
694
695 x25->dest_addr = addr->sx25_addr;
696
697 /* Move to connecting socket, start sending Connect Requests */
698 sock->state = SS_CONNECTING;
699 sk->sk_state = TCP_SYN_SENT;
700
701 x25->state = X25_STATE_1;
702
703 x25_write_internal(sk, X25_CALL_REQUEST);
704
705 x25_start_heartbeat(sk);
706 x25_start_t21timer(sk);
707
708 /* Now the loop */
709 rc = -EINPROGRESS;
710 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
711 goto out_put_neigh;
712
713 rc = x25_wait_for_connection_establishment(sk);
714 if (rc)
715 goto out_put_neigh;
716
717 sock->state = SS_CONNECTED;
718 rc = 0;
719 out_put_neigh:
720 if (rc)
721 x25_neigh_put(x25->neighbour);
722 out_put_route:
723 x25_route_put(rt);
724 out:
725 release_sock(sk);
726 return rc;
727 }
728
729 static int x25_wait_for_data(struct sock *sk, int timeout)
730 {
731 DECLARE_WAITQUEUE(wait, current);
732 int rc = 0;
733
734 add_wait_queue_exclusive(sk->sk_sleep, &wait);
735 for (;;) {
736 __set_current_state(TASK_INTERRUPTIBLE);
737 if (sk->sk_shutdown & RCV_SHUTDOWN)
738 break;
739 rc = -ERESTARTSYS;
740 if (signal_pending(current))
741 break;
742 rc = -EAGAIN;
743 if (!timeout)
744 break;
745 rc = 0;
746 if (skb_queue_empty(&sk->sk_receive_queue)) {
747 release_sock(sk);
748 timeout = schedule_timeout(timeout);
749 lock_sock(sk);
750 } else
751 break;
752 }
753 __set_current_state(TASK_RUNNING);
754 remove_wait_queue(sk->sk_sleep, &wait);
755 return rc;
756 }
757
758 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
759 {
760 struct sock *sk = sock->sk;
761 struct sock *newsk;
762 struct sk_buff *skb;
763 int rc = -EINVAL;
764
765 if (!sk || sk->sk_state != TCP_LISTEN)
766 goto out;
767
768 rc = -EOPNOTSUPP;
769 if (sk->sk_type != SOCK_SEQPACKET)
770 goto out;
771
772 lock_sock(sk);
773 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
774 if (rc)
775 goto out2;
776 skb = skb_dequeue(&sk->sk_receive_queue);
777 rc = -EINVAL;
778 if (!skb->sk)
779 goto out2;
780 newsk = skb->sk;
781 newsk->sk_socket = newsock;
782 newsk->sk_sleep = &newsock->wait;
783
784 /* Now attach up the new socket */
785 skb->sk = NULL;
786 kfree_skb(skb);
787 sk->sk_ack_backlog--;
788 newsock->sk = newsk;
789 newsock->state = SS_CONNECTED;
790 rc = 0;
791 out2:
792 release_sock(sk);
793 out:
794 return rc;
795 }
796
797 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
798 int *uaddr_len, int peer)
799 {
800 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
801 struct sock *sk = sock->sk;
802 struct x25_sock *x25 = x25_sk(sk);
803
804 if (peer) {
805 if (sk->sk_state != TCP_ESTABLISHED)
806 return -ENOTCONN;
807 sx25->sx25_addr = x25->dest_addr;
808 } else
809 sx25->sx25_addr = x25->source_addr;
810
811 sx25->sx25_family = AF_X25;
812 *uaddr_len = sizeof(*sx25);
813
814 return 0;
815 }
816
817 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
818 unsigned int lci)
819 {
820 struct sock *sk;
821 struct sock *make;
822 struct x25_sock *makex25;
823 struct x25_address source_addr, dest_addr;
824 struct x25_facilities facilities;
825 struct x25_calluserdata calluserdata;
826 int len, rc;
827
828 /*
829 * Remove the LCI and frame type.
830 */
831 skb_pull(skb, X25_STD_MIN_LEN);
832
833 /*
834 * Extract the X.25 addresses and convert them to ASCII strings,
835 * and remove them.
836 */
837 skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
838
839 /*
840 * Get the length of the facilities, skip past them for the moment
841 * get the call user data because this is needed to determine
842 * the correct listener
843 */
844 len = skb->data[0] + 1;
845 skb_pull(skb,len);
846
847 /*
848 * Incoming Call User Data.
849 */
850 if (skb->len >= 0) {
851 memcpy(calluserdata.cuddata, skb->data, skb->len);
852 calluserdata.cudlength = skb->len;
853 }
854
855 skb_push(skb,len);
856
857 /*
858 * Find a listener for the particular address/cud pair.
859 */
860 sk = x25_find_listener(&source_addr,&calluserdata);
861
862 /*
863 * We can't accept the Call Request.
864 */
865 if (sk == NULL || sk_acceptq_is_full(sk))
866 goto out_clear_request;
867
868 /*
869 * Try to reach a compromise on the requested facilities.
870 */
871 if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
872 goto out_sock_put;
873
874 /*
875 * current neighbour/link might impose additional limits
876 * on certain facilties
877 */
878
879 x25_limit_facilities(&facilities, nb);
880
881 /*
882 * Try to create a new socket.
883 */
884 make = x25_make_new(sk);
885 if (!make)
886 goto out_sock_put;
887
888 /*
889 * Remove the facilities
890 */
891 skb_pull(skb, len);
892
893 skb->sk = make;
894 make->sk_state = TCP_ESTABLISHED;
895
896 makex25 = x25_sk(make);
897 makex25->lci = lci;
898 makex25->dest_addr = dest_addr;
899 makex25->source_addr = source_addr;
900 makex25->neighbour = nb;
901 makex25->facilities = facilities;
902 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
903 makex25->calluserdata = calluserdata;
904
905 x25_write_internal(make, X25_CALL_ACCEPTED);
906
907 makex25->state = X25_STATE_3;
908
909 sk->sk_ack_backlog++;
910
911 x25_insert_socket(make);
912
913 skb_queue_head(&sk->sk_receive_queue, skb);
914
915 x25_start_heartbeat(make);
916
917 if (!sock_flag(sk, SOCK_DEAD))
918 sk->sk_data_ready(sk, skb->len);
919 rc = 1;
920 sock_put(sk);
921 out:
922 return rc;
923 out_sock_put:
924 sock_put(sk);
925 out_clear_request:
926 rc = 0;
927 x25_transmit_clear_request(nb, lci, 0x01);
928 goto out;
929 }
930
931 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
932 struct msghdr *msg, size_t len)
933 {
934 struct sock *sk = sock->sk;
935 struct x25_sock *x25 = x25_sk(sk);
936 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
937 struct sockaddr_x25 sx25;
938 struct sk_buff *skb;
939 unsigned char *asmptr;
940 int noblock = msg->msg_flags & MSG_DONTWAIT;
941 size_t size;
942 int qbit = 0, rc = -EINVAL;
943
944 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
945 goto out;
946
947 /* we currently don't support segmented records at the user interface */
948 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
949 goto out;
950
951 rc = -EADDRNOTAVAIL;
952 if (sock_flag(sk, SOCK_ZAPPED))
953 goto out;
954
955 rc = -EPIPE;
956 if (sk->sk_shutdown & SEND_SHUTDOWN) {
957 send_sig(SIGPIPE, current, 0);
958 goto out;
959 }
960
961 rc = -ENETUNREACH;
962 if (!x25->neighbour)
963 goto out;
964
965 if (usx25) {
966 rc = -EINVAL;
967 if (msg->msg_namelen < sizeof(sx25))
968 goto out;
969 memcpy(&sx25, usx25, sizeof(sx25));
970 rc = -EISCONN;
971 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
972 goto out;
973 rc = -EINVAL;
974 if (sx25.sx25_family != AF_X25)
975 goto out;
976 } else {
977 /*
978 * FIXME 1003.1g - if the socket is like this because
979 * it has become closed (not started closed) we ought
980 * to SIGPIPE, EPIPE;
981 */
982 rc = -ENOTCONN;
983 if (sk->sk_state != TCP_ESTABLISHED)
984 goto out;
985
986 sx25.sx25_family = AF_X25;
987 sx25.sx25_addr = x25->dest_addr;
988 }
989
990 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
991
992 /* Build a packet */
993 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
994
995 if ((msg->msg_flags & MSG_OOB) && len > 32)
996 len = 32;
997
998 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
999
1000 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1001 if (!skb)
1002 goto out;
1003 X25_SKB_CB(skb)->flags = msg->msg_flags;
1004
1005 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1006
1007 /*
1008 * Put the data on the end
1009 */
1010 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1011
1012 asmptr = skb->h.raw = skb_put(skb, len);
1013
1014 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1015 if (rc)
1016 goto out_kfree_skb;
1017
1018 /*
1019 * If the Q BIT Include socket option is in force, the first
1020 * byte of the user data is the logical value of the Q Bit.
1021 */
1022 if (x25->qbitincl) {
1023 qbit = skb->data[0];
1024 skb_pull(skb, 1);
1025 }
1026
1027 /*
1028 * Push down the X.25 header
1029 */
1030 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1031
1032 if (msg->msg_flags & MSG_OOB) {
1033 if (x25->neighbour->extended) {
1034 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1035 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1036 *asmptr++ = (x25->lci >> 0) & 0xFF;
1037 *asmptr++ = X25_INTERRUPT;
1038 } else {
1039 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1040 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1041 *asmptr++ = (x25->lci >> 0) & 0xFF;
1042 *asmptr++ = X25_INTERRUPT;
1043 }
1044 } else {
1045 if (x25->neighbour->extended) {
1046 /* Build an Extended X.25 header */
1047 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1048 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1049 *asmptr++ = (x25->lci >> 0) & 0xFF;
1050 *asmptr++ = X25_DATA;
1051 *asmptr++ = X25_DATA;
1052 } else {
1053 /* Build an Standard X.25 header */
1054 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1055 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1056 *asmptr++ = (x25->lci >> 0) & 0xFF;
1057 *asmptr++ = X25_DATA;
1058 }
1059
1060 if (qbit)
1061 skb->data[0] |= X25_Q_BIT;
1062 }
1063
1064 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1065 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1066
1067 rc = -ENOTCONN;
1068 if (sk->sk_state != TCP_ESTABLISHED)
1069 goto out_kfree_skb;
1070
1071 if (msg->msg_flags & MSG_OOB)
1072 skb_queue_tail(&x25->interrupt_out_queue, skb);
1073 else {
1074 len = x25_output(sk, skb);
1075 if (len < 0)
1076 kfree_skb(skb);
1077 else if (x25->qbitincl)
1078 len++;
1079 }
1080
1081 /*
1082 * lock_sock() is currently only used to serialize this x25_kick()
1083 * against input-driven x25_kick() calls. It currently only blocks
1084 * incoming packets for this socket and does not protect against
1085 * any other socket state changes and is not called from anywhere
1086 * else. As x25_kick() cannot block and as long as all socket
1087 * operations are BKL-wrapped, we don't need take to care about
1088 * purging the backlog queue in x25_release().
1089 *
1090 * Using lock_sock() to protect all socket operations entirely
1091 * (and making the whole x25 stack SMP aware) unfortunately would
1092 * require major changes to {send,recv}msg and skb allocation methods.
1093 * -> 2.5 ;)
1094 */
1095 lock_sock(sk);
1096 x25_kick(sk);
1097 release_sock(sk);
1098 rc = len;
1099 out:
1100 return rc;
1101 out_kfree_skb:
1102 kfree_skb(skb);
1103 goto out;
1104 }
1105
1106
1107 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1108 struct msghdr *msg, size_t size,
1109 int flags)
1110 {
1111 struct sock *sk = sock->sk;
1112 struct x25_sock *x25 = x25_sk(sk);
1113 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1114 size_t copied;
1115 int qbit;
1116 struct sk_buff *skb;
1117 unsigned char *asmptr;
1118 int rc = -ENOTCONN;
1119
1120 /*
1121 * This works for seqpacket too. The receiver has ordered the queue for
1122 * us! We do one quick check first though
1123 */
1124 if (sk->sk_state != TCP_ESTABLISHED)
1125 goto out;
1126
1127 if (flags & MSG_OOB) {
1128 rc = -EINVAL;
1129 if (sock_flag(sk, SOCK_URGINLINE) ||
1130 !skb_peek(&x25->interrupt_in_queue))
1131 goto out;
1132
1133 skb = skb_dequeue(&x25->interrupt_in_queue);
1134
1135 skb_pull(skb, X25_STD_MIN_LEN);
1136
1137 /*
1138 * No Q bit information on Interrupt data.
1139 */
1140 if (x25->qbitincl) {
1141 asmptr = skb_push(skb, 1);
1142 *asmptr = 0x00;
1143 }
1144
1145 msg->msg_flags |= MSG_OOB;
1146 } else {
1147 /* Now we can treat all alike */
1148 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1149 flags & MSG_DONTWAIT, &rc);
1150 if (!skb)
1151 goto out;
1152
1153 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1154
1155 skb_pull(skb, x25->neighbour->extended ?
1156 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1157
1158 if (x25->qbitincl) {
1159 asmptr = skb_push(skb, 1);
1160 *asmptr = qbit;
1161 }
1162 }
1163
1164 skb->h.raw = skb->data;
1165
1166 copied = skb->len;
1167
1168 if (copied > size) {
1169 copied = size;
1170 msg->msg_flags |= MSG_TRUNC;
1171 }
1172
1173 /* Currently, each datagram always contains a complete record */
1174 msg->msg_flags |= MSG_EOR;
1175
1176 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1177 if (rc)
1178 goto out_free_dgram;
1179
1180 if (sx25) {
1181 sx25->sx25_family = AF_X25;
1182 sx25->sx25_addr = x25->dest_addr;
1183 }
1184
1185 msg->msg_namelen = sizeof(struct sockaddr_x25);
1186
1187 lock_sock(sk);
1188 x25_check_rbuf(sk);
1189 release_sock(sk);
1190 rc = copied;
1191 out_free_dgram:
1192 skb_free_datagram(sk, skb);
1193 out:
1194 return rc;
1195 }
1196
1197
1198 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1199 {
1200 struct sock *sk = sock->sk;
1201 struct x25_sock *x25 = x25_sk(sk);
1202 void __user *argp = (void __user *)arg;
1203 int rc;
1204
1205 switch (cmd) {
1206 case TIOCOUTQ: {
1207 int amount = sk->sk_sndbuf -
1208 atomic_read(&sk->sk_wmem_alloc);
1209 if (amount < 0)
1210 amount = 0;
1211 rc = put_user(amount, (unsigned int __user *)argp);
1212 break;
1213 }
1214
1215 case TIOCINQ: {
1216 struct sk_buff *skb;
1217 int amount = 0;
1218 /*
1219 * These two are safe on a single CPU system as
1220 * only user tasks fiddle here
1221 */
1222 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1223 amount = skb->len;
1224 rc = put_user(amount, (unsigned int __user *)argp);
1225 break;
1226 }
1227
1228 case SIOCGSTAMP:
1229 rc = -EINVAL;
1230 if (sk)
1231 rc = sock_get_timestamp(sk,
1232 (struct timeval __user *)argp);
1233 break;
1234 case SIOCGIFADDR:
1235 case SIOCSIFADDR:
1236 case SIOCGIFDSTADDR:
1237 case SIOCSIFDSTADDR:
1238 case SIOCGIFBRDADDR:
1239 case SIOCSIFBRDADDR:
1240 case SIOCGIFNETMASK:
1241 case SIOCSIFNETMASK:
1242 case SIOCGIFMETRIC:
1243 case SIOCSIFMETRIC:
1244 rc = -EINVAL;
1245 break;
1246 case SIOCADDRT:
1247 case SIOCDELRT:
1248 rc = -EPERM;
1249 if (!capable(CAP_NET_ADMIN))
1250 break;
1251 rc = x25_route_ioctl(cmd, argp);
1252 break;
1253 case SIOCX25GSUBSCRIP:
1254 rc = x25_subscr_ioctl(cmd, argp);
1255 break;
1256 case SIOCX25SSUBSCRIP:
1257 rc = -EPERM;
1258 if (!capable(CAP_NET_ADMIN))
1259 break;
1260 rc = x25_subscr_ioctl(cmd, argp);
1261 break;
1262 case SIOCX25GFACILITIES: {
1263 struct x25_facilities fac = x25->facilities;
1264 rc = copy_to_user(argp, &fac,
1265 sizeof(fac)) ? -EFAULT : 0;
1266 break;
1267 }
1268
1269 case SIOCX25SFACILITIES: {
1270 struct x25_facilities facilities;
1271 rc = -EFAULT;
1272 if (copy_from_user(&facilities, argp,
1273 sizeof(facilities)))
1274 break;
1275 rc = -EINVAL;
1276 if (sk->sk_state != TCP_LISTEN &&
1277 sk->sk_state != TCP_CLOSE)
1278 break;
1279 if (facilities.pacsize_in < X25_PS16 ||
1280 facilities.pacsize_in > X25_PS4096)
1281 break;
1282 if (facilities.pacsize_out < X25_PS16 ||
1283 facilities.pacsize_out > X25_PS4096)
1284 break;
1285 if (facilities.winsize_in < 1 ||
1286 facilities.winsize_in > 127)
1287 break;
1288 if (facilities.throughput < 0x03 ||
1289 facilities.throughput > 0xDD)
1290 break;
1291 if (facilities.reverse && facilities.reverse != 1)
1292 break;
1293 x25->facilities = facilities;
1294 rc = 0;
1295 break;
1296 }
1297
1298 case SIOCX25GCALLUSERDATA: {
1299 struct x25_calluserdata cud = x25->calluserdata;
1300 rc = copy_to_user(argp, &cud,
1301 sizeof(cud)) ? -EFAULT : 0;
1302 break;
1303 }
1304
1305 case SIOCX25SCALLUSERDATA: {
1306 struct x25_calluserdata calluserdata;
1307
1308 rc = -EFAULT;
1309 if (copy_from_user(&calluserdata, argp,
1310 sizeof(calluserdata)))
1311 break;
1312 rc = -EINVAL;
1313 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1314 break;
1315 x25->calluserdata = calluserdata;
1316 rc = 0;
1317 break;
1318 }
1319
1320 case SIOCX25GCAUSEDIAG: {
1321 struct x25_causediag causediag;
1322 causediag = x25->causediag;
1323 rc = copy_to_user(argp, &causediag,
1324 sizeof(causediag)) ? -EFAULT : 0;
1325 break;
1326 }
1327
1328 default:
1329 rc = dev_ioctl(cmd, argp);
1330 break;
1331 }
1332
1333 return rc;
1334 }
1335
1336 static struct net_proto_family x25_family_ops = {
1337 .family = AF_X25,
1338 .create = x25_create,
1339 .owner = THIS_MODULE,
1340 };
1341
1342 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1343 .family = AF_X25,
1344 .owner = THIS_MODULE,
1345 .release = x25_release,
1346 .bind = x25_bind,
1347 .connect = x25_connect,
1348 .socketpair = sock_no_socketpair,
1349 .accept = x25_accept,
1350 .getname = x25_getname,
1351 .poll = datagram_poll,
1352 .ioctl = x25_ioctl,
1353 .listen = x25_listen,
1354 .shutdown = sock_no_shutdown,
1355 .setsockopt = x25_setsockopt,
1356 .getsockopt = x25_getsockopt,
1357 .sendmsg = x25_sendmsg,
1358 .recvmsg = x25_recvmsg,
1359 .mmap = sock_no_mmap,
1360 .sendpage = sock_no_sendpage,
1361 };
1362
1363 #include <linux/smp_lock.h>
1364 SOCKOPS_WRAP(x25_proto, AF_X25);
1365
1366 static struct packet_type x25_packet_type = {
1367 .type = __constant_htons(ETH_P_X25),
1368 .func = x25_lapb_receive_frame,
1369 };
1370
1371 static struct notifier_block x25_dev_notifier = {
1372 .notifier_call = x25_device_event,
1373 };
1374
1375 void x25_kill_by_neigh(struct x25_neigh *nb)
1376 {
1377 struct sock *s;
1378 struct hlist_node *node;
1379
1380 write_lock_bh(&x25_list_lock);
1381
1382 sk_for_each(s, node, &x25_list)
1383 if (x25_sk(s)->neighbour == nb)
1384 x25_disconnect(s, ENETUNREACH, 0, 0);
1385
1386 write_unlock_bh(&x25_list_lock);
1387 }
1388
1389 static int __init x25_init(void)
1390 {
1391 int rc = proto_register(&x25_proto, 0);
1392
1393 if (rc != 0)
1394 goto out;
1395
1396 sock_register(&x25_family_ops);
1397
1398 dev_add_pack(&x25_packet_type);
1399
1400 register_netdevice_notifier(&x25_dev_notifier);
1401
1402 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1403
1404 #ifdef CONFIG_SYSCTL
1405 x25_register_sysctl();
1406 #endif
1407 x25_proc_init();
1408 out:
1409 return rc;
1410 }
1411 module_init(x25_init);
1412
1413 static void __exit x25_exit(void)
1414 {
1415 x25_proc_exit();
1416 x25_link_free();
1417 x25_route_free();
1418
1419 #ifdef CONFIG_SYSCTL
1420 x25_unregister_sysctl();
1421 #endif
1422
1423 unregister_netdevice_notifier(&x25_dev_notifier);
1424
1425 dev_remove_pack(&x25_packet_type);
1426
1427 sock_unregister(AF_X25);
1428 proto_unregister(&x25_proto);
1429 }
1430 module_exit(x25_exit);
1431
1432 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1433 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1434 MODULE_LICENSE("GPL");
1435 MODULE_ALIAS_NETPROTO(PF_X25);
kernel-based virtual machine