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net/ncsi: Use real net-device for response handler
[linux/fpc-iii.git] / net / x25 / af_x25.c
blob9c3fbf4553cc76e49fa0c4ac9dc3b8523442ce10
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 #define pr_fmt(fmt) "X25: " fmt
39
40 #include <linux/module.h>
41 #include <linux/capability.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/sched.h>
45 #include <linux/timer.h>
46 #include <linux/string.h>
47 #include <linux/net.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/skbuff.h>
51 #include <linux/slab.h>
52 #include <net/sock.h>
53 #include <net/tcp_states.h>
54 #include <asm/uaccess.h>
55 #include <linux/fcntl.h>
56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
57 #include <linux/notifier.h>
58 #include <linux/init.h>
59 #include <linux/compat.h>
60 #include <linux/ctype.h>
61
62 #include <net/x25.h>
63 #include <net/compat.h>
64
65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
70 int sysctl_x25_forward = 0;
71
72 HLIST_HEAD(x25_list);
73 DEFINE_RWLOCK(x25_list_lock);
74
75 static const struct proto_ops x25_proto_ops;
76
77 static struct x25_address null_x25_address = {" "};
78
79 #ifdef CONFIG_COMPAT
80 struct compat_x25_subscrip_struct {
81 char device[200-sizeof(compat_ulong_t)];
82 compat_ulong_t global_facil_mask;
83 compat_uint_t extended;
84 };
85 #endif
86
87
88 int x25_parse_address_block(struct sk_buff *skb,
89 struct x25_address *called_addr,
90 struct x25_address *calling_addr)
91 {
92 unsigned char len;
93 int needed;
94 int rc;
95
96 if (!pskb_may_pull(skb, 1)) {
97 /* packet has no address block */
98 rc = 0;
99 goto empty;
100 }
101
102 len = *skb->data;
103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
104
105 if (!pskb_may_pull(skb, needed)) {
106 /* packet is too short to hold the addresses it claims
107 to hold */
108 rc = -1;
109 goto empty;
110 }
111
112 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
113
114 empty:
115 *called_addr->x25_addr = 0;
116 *calling_addr->x25_addr = 0;
117
118 return rc;
119 }
120
121
122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
124 {
125 unsigned int called_len, calling_len;
126 char *called, *calling;
127 unsigned int i;
128
129 called_len = (*p >> 0) & 0x0F;
130 calling_len = (*p >> 4) & 0x0F;
131
132 called = called_addr->x25_addr;
133 calling = calling_addr->x25_addr;
134 p++;
135
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
138 if (i % 2 != 0) {
139 *called++ = ((*p >> 0) & 0x0F) + '0';
140 p++;
141 } else {
142 *called++ = ((*p >> 4) & 0x0F) + '0';
143 }
144 } else {
145 if (i % 2 != 0) {
146 *calling++ = ((*p >> 0) & 0x0F) + '0';
147 p++;
148 } else {
149 *calling++ = ((*p >> 4) & 0x0F) + '0';
150 }
151 }
152 }
153
154 *called = *calling = '\0';
155
156 return 1 + (called_len + calling_len + 1) / 2;
157 }
158
159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160 struct x25_address *calling_addr)
161 {
162 unsigned int called_len, calling_len;
163 char *called, *calling;
164 int i;
165
166 called = called_addr->x25_addr;
167 calling = calling_addr->x25_addr;
168
169 called_len = strlen(called);
170 calling_len = strlen(calling);
171
172 *p++ = (calling_len << 4) | (called_len << 0);
173
174 for (i = 0; i < (called_len + calling_len); i++) {
175 if (i < called_len) {
176 if (i % 2 != 0) {
177 *p |= (*called++ - '0') << 0;
178 p++;
179 } else {
180 *p = 0x00;
181 *p |= (*called++ - '0') << 4;
182 }
183 } else {
184 if (i % 2 != 0) {
185 *p |= (*calling++ - '0') << 0;
186 p++;
187 } else {
188 *p = 0x00;
189 *p |= (*calling++ - '0') << 4;
190 }
191 }
192 }
193
194 return 1 + (called_len + calling_len + 1) / 2;
195 }
196
197 /*
198 * Socket removal during an interrupt is now safe.
199 */
200 static void x25_remove_socket(struct sock *sk)
201 {
202 write_lock_bh(&x25_list_lock);
203 sk_del_node_init(sk);
204 write_unlock_bh(&x25_list_lock);
205 }
206
207 /*
208 * Kill all bound sockets on a dropped device.
209 */
210 static void x25_kill_by_device(struct net_device *dev)
211 {
212 struct sock *s;
213
214 write_lock_bh(&x25_list_lock);
215
216 sk_for_each(s, &x25_list)
217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
219
220 write_unlock_bh(&x25_list_lock);
221 }
222
223 /*
224 * Handle device status changes.
225 */
226 static int x25_device_event(struct notifier_block *this, unsigned long event,
227 void *ptr)
228 {
229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
230 struct x25_neigh *nb;
231
232 if (!net_eq(dev_net(dev), &init_net))
233 return NOTIFY_DONE;
234
235 if (dev->type == ARPHRD_X25
236 #if IS_ENABLED(CONFIG_LLC)
237 || dev->type == ARPHRD_ETHER
238 #endif
239 ) {
240 switch (event) {
241 case NETDEV_UP:
242 x25_link_device_up(dev);
243 break;
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
246 if (nb) {
247 x25_terminate_link(nb);
248 x25_neigh_put(nb);
249 }
250 break;
251 case NETDEV_DOWN:
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
255 break;
256 }
257 }
258
259 return NOTIFY_DONE;
260 }
261
262 /*
263 * Add a socket to the bound sockets list.
264 */
265 static void x25_insert_socket(struct sock *sk)
266 {
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
270 }
271
272 /*
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
277 * with matching cud.
278 */
279 static struct sock *x25_find_listener(struct x25_address *addr,
280 struct sk_buff *skb)
281 {
282 struct sock *s;
283 struct sock *next_best;
284
285 read_lock_bh(&x25_list_lock);
286 next_best = NULL;
287
288 sk_for_each(s, &x25_list)
289 if ((!strcmp(addr->x25_addr,
290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(x25_sk(s)->source_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
327 sk_for_each(s, &x25_list)
328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
329 sock_hold(s);
330 goto found;
331 }
332 s = NULL;
333 found:
334 return s;
335 }
336
337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
338 {
339 struct sock *s;
340
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
344 return s;
345 }
346
347 /*
348 * Find a unique LCI for a given device.
349 */
350 static unsigned int x25_new_lci(struct x25_neigh *nb)
351 {
352 unsigned int lci = 1;
353 struct sock *sk;
354
355 while ((sk = x25_find_socket(lci, nb)) != NULL) {
356 sock_put(sk);
357 if (++lci == 4096) {
358 lci = 0;
359 break;
360 }
361 cond_resched();
362 }
363
364 return lci;
365 }
366
367 /*
368 * Deferred destroy.
369 */
370 static void __x25_destroy_socket(struct sock *);
371
372 /*
373 * handler for deferred kills.
374 */
375 static void x25_destroy_timer(unsigned long data)
376 {
377 x25_destroy_socket_from_timer((struct sock *)data);
378 }
379
380 /*
381 * This is called from user mode and the timers. Thus it protects itself
382 * against interrupt users but doesn't worry about being called during
383 * work. Once it is removed from the queue no interrupt or bottom half
384 * will touch it and we are (fairly 8-) ) safe.
385 * Not static as it's used by the timer
386 */
387 static void __x25_destroy_socket(struct sock *sk)
388 {
389 struct sk_buff *skb;
390
391 x25_stop_heartbeat(sk);
392 x25_stop_timer(sk);
393
394 x25_remove_socket(sk);
395 x25_clear_queues(sk); /* Flush the queues */
396
397 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
398 if (skb->sk != sk) { /* A pending connection */
399 /*
400 * Queue the unaccepted socket for death
401 */
402 skb->sk->sk_state = TCP_LISTEN;
403 sock_set_flag(skb->sk, SOCK_DEAD);
404 x25_start_heartbeat(skb->sk);
405 x25_sk(skb->sk)->state = X25_STATE_0;
406 }
407
408 kfree_skb(skb);
409 }
410
411 if (sk_has_allocations(sk)) {
412 /* Defer: outstanding buffers */
413 sk->sk_timer.expires = jiffies + 10 * HZ;
414 sk->sk_timer.function = x25_destroy_timer;
415 sk->sk_timer.data = (unsigned long)sk;
416 add_timer(&sk->sk_timer);
417 } else {
418 /* drop last reference so sock_put will free */
419 __sock_put(sk);
420 }
421 }
422
423 void x25_destroy_socket_from_timer(struct sock *sk)
424 {
425 sock_hold(sk);
426 bh_lock_sock(sk);
427 __x25_destroy_socket(sk);
428 bh_unlock_sock(sk);
429 sock_put(sk);
430 }
431
432 /*
433 * Handling for system calls applied via the various interfaces to a
434 * X.25 socket object.
435 */
436
437 static int x25_setsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, unsigned int optlen)
439 {
440 int opt;
441 struct sock *sk = sock->sk;
442 int rc = -ENOPROTOOPT;
443
444 if (level != SOL_X25 || optname != X25_QBITINCL)
445 goto out;
446
447 rc = -EINVAL;
448 if (optlen < sizeof(int))
449 goto out;
450
451 rc = -EFAULT;
452 if (get_user(opt, (int __user *)optval))
453 goto out;
454
455 if (opt)
456 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
457 else
458 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
459 rc = 0;
460 out:
461 return rc;
462 }
463
464 static int x25_getsockopt(struct socket *sock, int level, int optname,
465 char __user *optval, int __user *optlen)
466 {
467 struct sock *sk = sock->sk;
468 int val, len, rc = -ENOPROTOOPT;
469
470 if (level != SOL_X25 || optname != X25_QBITINCL)
471 goto out;
472
473 rc = -EFAULT;
474 if (get_user(len, optlen))
475 goto out;
476
477 len = min_t(unsigned int, len, sizeof(int));
478
479 rc = -EINVAL;
480 if (len < 0)
481 goto out;
482
483 rc = -EFAULT;
484 if (put_user(len, optlen))
485 goto out;
486
487 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
488 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
489 out:
490 return rc;
491 }
492
493 static int x25_listen(struct socket *sock, int backlog)
494 {
495 struct sock *sk = sock->sk;
496 int rc = -EOPNOTSUPP;
497
498 lock_sock(sk);
499 if (sk->sk_state != TCP_LISTEN) {
500 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
501 sk->sk_max_ack_backlog = backlog;
502 sk->sk_state = TCP_LISTEN;
503 rc = 0;
504 }
505 release_sock(sk);
506
507 return rc;
508 }
509
510 static struct proto x25_proto = {
511 .name = "X25",
512 .owner = THIS_MODULE,
513 .obj_size = sizeof(struct x25_sock),
514 };
515
516 static struct sock *x25_alloc_socket(struct net *net, int kern)
517 {
518 struct x25_sock *x25;
519 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
520
521 if (!sk)
522 goto out;
523
524 sock_init_data(NULL, sk);
525
526 x25 = x25_sk(sk);
527 skb_queue_head_init(&x25->ack_queue);
528 skb_queue_head_init(&x25->fragment_queue);
529 skb_queue_head_init(&x25->interrupt_in_queue);
530 skb_queue_head_init(&x25->interrupt_out_queue);
531 out:
532 return sk;
533 }
534
535 static int x25_create(struct net *net, struct socket *sock, int protocol,
536 int kern)
537 {
538 struct sock *sk;
539 struct x25_sock *x25;
540 int rc = -EAFNOSUPPORT;
541
542 if (!net_eq(net, &init_net))
543 goto out;
544
545 rc = -ESOCKTNOSUPPORT;
546 if (sock->type != SOCK_SEQPACKET)
547 goto out;
548
549 rc = -EINVAL;
550 if (protocol)
551 goto out;
552
553 rc = -ENOBUFS;
554 if ((sk = x25_alloc_socket(net, kern)) == NULL)
555 goto out;
556
557 x25 = x25_sk(sk);
558
559 sock_init_data(sock, sk);
560
561 x25_init_timers(sk);
562
563 sock->ops = &x25_proto_ops;
564 sk->sk_protocol = protocol;
565 sk->sk_backlog_rcv = x25_backlog_rcv;
566
567 x25->t21 = sysctl_x25_call_request_timeout;
568 x25->t22 = sysctl_x25_reset_request_timeout;
569 x25->t23 = sysctl_x25_clear_request_timeout;
570 x25->t2 = sysctl_x25_ack_holdback_timeout;
571 x25->state = X25_STATE_0;
572 x25->cudmatchlength = 0;
573 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
574 /* on call accept */
575
576 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
577 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
578 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
579 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
580 x25->facilities.throughput = 0; /* by default don't negotiate
581 throughput */
582 x25->facilities.reverse = X25_DEFAULT_REVERSE;
583 x25->dte_facilities.calling_len = 0;
584 x25->dte_facilities.called_len = 0;
585 memset(x25->dte_facilities.called_ae, '\0',
586 sizeof(x25->dte_facilities.called_ae));
587 memset(x25->dte_facilities.calling_ae, '\0',
588 sizeof(x25->dte_facilities.calling_ae));
589
590 rc = 0;
591 out:
592 return rc;
593 }
594
595 static struct sock *x25_make_new(struct sock *osk)
596 {
597 struct sock *sk = NULL;
598 struct x25_sock *x25, *ox25;
599
600 if (osk->sk_type != SOCK_SEQPACKET)
601 goto out;
602
603 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
604 goto out;
605
606 x25 = x25_sk(sk);
607
608 sk->sk_type = osk->sk_type;
609 sk->sk_priority = osk->sk_priority;
610 sk->sk_protocol = osk->sk_protocol;
611 sk->sk_rcvbuf = osk->sk_rcvbuf;
612 sk->sk_sndbuf = osk->sk_sndbuf;
613 sk->sk_state = TCP_ESTABLISHED;
614 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
615 sock_copy_flags(sk, osk);
616
617 ox25 = x25_sk(osk);
618 x25->t21 = ox25->t21;
619 x25->t22 = ox25->t22;
620 x25->t23 = ox25->t23;
621 x25->t2 = ox25->t2;
622 x25->flags = ox25->flags;
623 x25->facilities = ox25->facilities;
624 x25->dte_facilities = ox25->dte_facilities;
625 x25->cudmatchlength = ox25->cudmatchlength;
626
627 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
628 x25_init_timers(sk);
629 out:
630 return sk;
631 }
632
633 static int x25_release(struct socket *sock)
634 {
635 struct sock *sk = sock->sk;
636 struct x25_sock *x25;
637
638 if (!sk)
639 return 0;
640
641 x25 = x25_sk(sk);
642
643 sock_hold(sk);
644 lock_sock(sk);
645 switch (x25->state) {
646
647 case X25_STATE_0:
648 case X25_STATE_2:
649 x25_disconnect(sk, 0, 0, 0);
650 __x25_destroy_socket(sk);
651 goto out;
652
653 case X25_STATE_1:
654 case X25_STATE_3:
655 case X25_STATE_4:
656 x25_clear_queues(sk);
657 x25_write_internal(sk, X25_CLEAR_REQUEST);
658 x25_start_t23timer(sk);
659 x25->state = X25_STATE_2;
660 sk->sk_state = TCP_CLOSE;
661 sk->sk_shutdown |= SEND_SHUTDOWN;
662 sk->sk_state_change(sk);
663 sock_set_flag(sk, SOCK_DEAD);
664 sock_set_flag(sk, SOCK_DESTROY);
665 break;
666 }
667
668 sock_orphan(sk);
669 out:
670 release_sock(sk);
671 sock_put(sk);
672 return 0;
673 }
674
675 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
676 {
677 struct sock *sk = sock->sk;
678 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
679 int len, i, rc = 0;
680
681 if (addr_len != sizeof(struct sockaddr_x25) ||
682 addr->sx25_family != AF_X25 ||
683 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
684 rc = -EINVAL;
685 goto out;
686 }
687
688 /* check for the null_x25_address */
689 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
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
700 lock_sock(sk);
701 if (sock_flag(sk, SOCK_ZAPPED)) {
702 x25_sk(sk)->source_addr = addr->sx25_addr;
703 x25_insert_socket(sk);
704 sock_reset_flag(sk, SOCK_ZAPPED);
705 } else {
706 rc = -EINVAL;
707 }
708 release_sock(sk);
709 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
710 out:
711 return rc;
712 }
713
714 static int x25_wait_for_connection_establishment(struct sock *sk)
715 {
716 DECLARE_WAITQUEUE(wait, current);
717 int rc;
718
719 add_wait_queue_exclusive(sk_sleep(sk), &wait);
720 for (;;) {
721 __set_current_state(TASK_INTERRUPTIBLE);
722 rc = -ERESTARTSYS;
723 if (signal_pending(current))
724 break;
725 rc = sock_error(sk);
726 if (rc) {
727 sk->sk_socket->state = SS_UNCONNECTED;
728 break;
729 }
730 rc = 0;
731 if (sk->sk_state != TCP_ESTABLISHED) {
732 release_sock(sk);
733 schedule();
734 lock_sock(sk);
735 } else
736 break;
737 }
738 __set_current_state(TASK_RUNNING);
739 remove_wait_queue(sk_sleep(sk), &wait);
740 return rc;
741 }
742
743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
744 int addr_len, int flags)
745 {
746 struct sock *sk = sock->sk;
747 struct x25_sock *x25 = x25_sk(sk);
748 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
749 struct x25_route *rt;
750 int rc = 0;
751
752 lock_sock(sk);
753 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
754 sock->state = SS_CONNECTED;
755 goto out; /* Connect completed during a ERESTARTSYS event */
756 }
757
758 rc = -ECONNREFUSED;
759 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
760 sock->state = SS_UNCONNECTED;
761 goto out;
762 }
763
764 rc = -EISCONN; /* No reconnect on a seqpacket socket */
765 if (sk->sk_state == TCP_ESTABLISHED)
766 goto out;
767
768 rc = -EALREADY; /* Do nothing if call is already in progress */
769 if (sk->sk_state == TCP_SYN_SENT)
770 goto out;
771
772 sk->sk_state = TCP_CLOSE;
773 sock->state = SS_UNCONNECTED;
774
775 rc = -EINVAL;
776 if (addr_len != sizeof(struct sockaddr_x25) ||
777 addr->sx25_family != AF_X25 ||
778 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
779 goto out;
780
781 rc = -ENETUNREACH;
782 rt = x25_get_route(&addr->sx25_addr);
783 if (!rt)
784 goto out;
785
786 x25->neighbour = x25_get_neigh(rt->dev);
787 if (!x25->neighbour)
788 goto out_put_route;
789
790 x25_limit_facilities(&x25->facilities, x25->neighbour);
791
792 x25->lci = x25_new_lci(x25->neighbour);
793 if (!x25->lci)
794 goto out_put_neigh;
795
796 rc = -EINVAL;
797 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
798 goto out_put_neigh;
799
800 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
801 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
802
803 x25->dest_addr = addr->sx25_addr;
804
805 /* Move to connecting socket, start sending Connect Requests */
806 sock->state = SS_CONNECTING;
807 sk->sk_state = TCP_SYN_SENT;
808
809 x25->state = X25_STATE_1;
810
811 x25_write_internal(sk, X25_CALL_REQUEST);
812
813 x25_start_heartbeat(sk);
814 x25_start_t21timer(sk);
815
816 /* Now the loop */
817 rc = -EINPROGRESS;
818 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
819 goto out;
820
821 rc = x25_wait_for_connection_establishment(sk);
822 if (rc)
823 goto out_put_neigh;
824
825 sock->state = SS_CONNECTED;
826 rc = 0;
827 out_put_neigh:
828 if (rc && x25->neighbour) {
829 read_lock_bh(&x25_list_lock);
830 x25_neigh_put(x25->neighbour);
831 x25->neighbour = NULL;
832 read_unlock_bh(&x25_list_lock);
833 x25->state = X25_STATE_0;
834 }
835 out_put_route:
836 x25_route_put(rt);
837 out:
838 release_sock(sk);
839 return rc;
840 }
841
842 static int x25_wait_for_data(struct sock *sk, long timeout)
843 {
844 DECLARE_WAITQUEUE(wait, current);
845 int rc = 0;
846
847 add_wait_queue_exclusive(sk_sleep(sk), &wait);
848 for (;;) {
849 __set_current_state(TASK_INTERRUPTIBLE);
850 if (sk->sk_shutdown & RCV_SHUTDOWN)
851 break;
852 rc = -ERESTARTSYS;
853 if (signal_pending(current))
854 break;
855 rc = -EAGAIN;
856 if (!timeout)
857 break;
858 rc = 0;
859 if (skb_queue_empty(&sk->sk_receive_queue)) {
860 release_sock(sk);
861 timeout = schedule_timeout(timeout);
862 lock_sock(sk);
863 } else
864 break;
865 }
866 __set_current_state(TASK_RUNNING);
867 remove_wait_queue(sk_sleep(sk), &wait);
868 return rc;
869 }
870
871 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
872 {
873 struct sock *sk = sock->sk;
874 struct sock *newsk;
875 struct sk_buff *skb;
876 int rc = -EINVAL;
877
878 if (!sk)
879 goto out;
880
881 rc = -EOPNOTSUPP;
882 if (sk->sk_type != SOCK_SEQPACKET)
883 goto out;
884
885 lock_sock(sk);
886 rc = -EINVAL;
887 if (sk->sk_state != TCP_LISTEN)
888 goto out2;
889
890 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
891 if (rc)
892 goto out2;
893 skb = skb_dequeue(&sk->sk_receive_queue);
894 rc = -EINVAL;
895 if (!skb->sk)
896 goto out2;
897 newsk = skb->sk;
898 sock_graft(newsk, newsock);
899
900 /* Now attach up the new socket */
901 skb->sk = NULL;
902 kfree_skb(skb);
903 sk->sk_ack_backlog--;
904 newsock->state = SS_CONNECTED;
905 rc = 0;
906 out2:
907 release_sock(sk);
908 out:
909 return rc;
910 }
911
912 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
913 int *uaddr_len, int peer)
914 {
915 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
916 struct sock *sk = sock->sk;
917 struct x25_sock *x25 = x25_sk(sk);
918 int rc = 0;
919
920 if (peer) {
921 if (sk->sk_state != TCP_ESTABLISHED) {
922 rc = -ENOTCONN;
923 goto out;
924 }
925 sx25->sx25_addr = x25->dest_addr;
926 } else
927 sx25->sx25_addr = x25->source_addr;
928
929 sx25->sx25_family = AF_X25;
930 *uaddr_len = sizeof(*sx25);
931
932 out:
933 return rc;
934 }
935
936 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
937 unsigned int lci)
938 {
939 struct sock *sk;
940 struct sock *make;
941 struct x25_sock *makex25;
942 struct x25_address source_addr, dest_addr;
943 struct x25_facilities facilities;
944 struct x25_dte_facilities dte_facilities;
945 int len, addr_len, rc;
946
947 /*
948 * Remove the LCI and frame type.
949 */
950 skb_pull(skb, X25_STD_MIN_LEN);
951
952 /*
953 * Extract the X.25 addresses and convert them to ASCII strings,
954 * and remove them.
955 *
956 * Address block is mandatory in call request packets
957 */
958 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
959 if (addr_len <= 0)
960 goto out_clear_request;
961 skb_pull(skb, addr_len);
962
963 /*
964 * Get the length of the facilities, skip past them for the moment
965 * get the call user data because this is needed to determine
966 * the correct listener
967 *
968 * Facilities length is mandatory in call request packets
969 */
970 if (!pskb_may_pull(skb, 1))
971 goto out_clear_request;
972 len = skb->data[0] + 1;
973 if (!pskb_may_pull(skb, len))
974 goto out_clear_request;
975 skb_pull(skb,len);
976
977 /*
978 * Ensure that the amount of call user data is valid.
979 */
980 if (skb->len > X25_MAX_CUD_LEN)
981 goto out_clear_request;
982
983 /*
984 * Get all the call user data so it can be used in
985 * x25_find_listener and skb_copy_from_linear_data up ahead.
986 */
987 if (!pskb_may_pull(skb, skb->len))
988 goto out_clear_request;
989
990 /*
991 * Find a listener for the particular address/cud pair.
992 */
993 sk = x25_find_listener(&source_addr,skb);
994 skb_push(skb,len);
995
996 if (sk != NULL && sk_acceptq_is_full(sk)) {
997 goto out_sock_put;
998 }
999
1000 /*
1001 * We dont have any listeners for this incoming call.
1002 * Try forwarding it.
1003 */
1004 if (sk == NULL) {
1005 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1006 if (sysctl_x25_forward &&
1007 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1008 {
1009 /* Call was forwarded, dont process it any more */
1010 kfree_skb(skb);
1011 rc = 1;
1012 goto out;
1013 } else {
1014 /* No listeners, can't forward, clear the call */
1015 goto out_clear_request;
1016 }
1017 }
1018
1019 /*
1020 * Try to reach a compromise on the requested facilities.
1021 */
1022 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1023 if (len == -1)
1024 goto out_sock_put;
1025
1026 /*
1027 * current neighbour/link might impose additional limits
1028 * on certain facilties
1029 */
1030
1031 x25_limit_facilities(&facilities, nb);
1032
1033 /*
1034 * Try to create a new socket.
1035 */
1036 make = x25_make_new(sk);
1037 if (!make)
1038 goto out_sock_put;
1039
1040 /*
1041 * Remove the facilities
1042 */
1043 skb_pull(skb, len);
1044
1045 skb->sk = make;
1046 make->sk_state = TCP_ESTABLISHED;
1047
1048 makex25 = x25_sk(make);
1049 makex25->lci = lci;
1050 makex25->dest_addr = dest_addr;
1051 makex25->source_addr = source_addr;
1052 x25_neigh_hold(nb);
1053 makex25->neighbour = nb;
1054 makex25->facilities = facilities;
1055 makex25->dte_facilities= dte_facilities;
1056 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1057 /* ensure no reverse facil on accept */
1058 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1059 /* ensure no calling address extension on accept */
1060 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1061 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1062
1063 /* Normally all calls are accepted immediately */
1064 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1065 x25_write_internal(make, X25_CALL_ACCEPTED);
1066 makex25->state = X25_STATE_3;
1067 }
1068
1069 /*
1070 * Incoming Call User Data.
1071 */
1072 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1073 makex25->calluserdata.cudlength = skb->len;
1074
1075 sk->sk_ack_backlog++;
1076
1077 x25_insert_socket(make);
1078
1079 skb_queue_head(&sk->sk_receive_queue, skb);
1080
1081 x25_start_heartbeat(make);
1082
1083 if (!sock_flag(sk, SOCK_DEAD))
1084 sk->sk_data_ready(sk);
1085 rc = 1;
1086 sock_put(sk);
1087 out:
1088 return rc;
1089 out_sock_put:
1090 sock_put(sk);
1091 out_clear_request:
1092 rc = 0;
1093 x25_transmit_clear_request(nb, lci, 0x01);
1094 goto out;
1095 }
1096
1097 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1098 {
1099 struct sock *sk = sock->sk;
1100 struct x25_sock *x25 = x25_sk(sk);
1101 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1102 struct sockaddr_x25 sx25;
1103 struct sk_buff *skb;
1104 unsigned char *asmptr;
1105 int noblock = msg->msg_flags & MSG_DONTWAIT;
1106 size_t size;
1107 int qbit = 0, rc = -EINVAL;
1108
1109 lock_sock(sk);
1110 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1111 goto out;
1112
1113 /* we currently don't support segmented records at the user interface */
1114 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1115 goto out;
1116
1117 rc = -EADDRNOTAVAIL;
1118 if (sock_flag(sk, SOCK_ZAPPED))
1119 goto out;
1120
1121 rc = -EPIPE;
1122 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1123 send_sig(SIGPIPE, current, 0);
1124 goto out;
1125 }
1126
1127 rc = -ENETUNREACH;
1128 if (!x25->neighbour)
1129 goto out;
1130
1131 if (usx25) {
1132 rc = -EINVAL;
1133 if (msg->msg_namelen < sizeof(sx25))
1134 goto out;
1135 memcpy(&sx25, usx25, sizeof(sx25));
1136 rc = -EISCONN;
1137 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1138 goto out;
1139 rc = -EINVAL;
1140 if (sx25.sx25_family != AF_X25)
1141 goto out;
1142 } else {
1143 /*
1144 * FIXME 1003.1g - if the socket is like this because
1145 * it has become closed (not started closed) we ought
1146 * to SIGPIPE, EPIPE;
1147 */
1148 rc = -ENOTCONN;
1149 if (sk->sk_state != TCP_ESTABLISHED)
1150 goto out;
1151
1152 sx25.sx25_family = AF_X25;
1153 sx25.sx25_addr = x25->dest_addr;
1154 }
1155
1156 /* Sanity check the packet size */
1157 if (len > 65535) {
1158 rc = -EMSGSIZE;
1159 goto out;
1160 }
1161
1162 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1163
1164 /* Build a packet */
1165 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1166
1167 if ((msg->msg_flags & MSG_OOB) && len > 32)
1168 len = 32;
1169
1170 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1171
1172 release_sock(sk);
1173 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1174 lock_sock(sk);
1175 if (!skb)
1176 goto out;
1177 X25_SKB_CB(skb)->flags = msg->msg_flags;
1178
1179 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1180
1181 /*
1182 * Put the data on the end
1183 */
1184 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1185
1186 skb_reset_transport_header(skb);
1187 skb_put(skb, len);
1188
1189 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1190 if (rc)
1191 goto out_kfree_skb;
1192
1193 /*
1194 * If the Q BIT Include socket option is in force, the first
1195 * byte of the user data is the logical value of the Q Bit.
1196 */
1197 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1198 if (!pskb_may_pull(skb, 1))
1199 goto out_kfree_skb;
1200
1201 qbit = skb->data[0];
1202 skb_pull(skb, 1);
1203 }
1204
1205 /*
1206 * Push down the X.25 header
1207 */
1208 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1209
1210 if (msg->msg_flags & MSG_OOB) {
1211 if (x25->neighbour->extended) {
1212 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1214 *asmptr++ = (x25->lci >> 0) & 0xFF;
1215 *asmptr++ = X25_INTERRUPT;
1216 } else {
1217 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219 *asmptr++ = (x25->lci >> 0) & 0xFF;
1220 *asmptr++ = X25_INTERRUPT;
1221 }
1222 } else {
1223 if (x25->neighbour->extended) {
1224 /* Build an Extended X.25 header */
1225 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1226 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1227 *asmptr++ = (x25->lci >> 0) & 0xFF;
1228 *asmptr++ = X25_DATA;
1229 *asmptr++ = X25_DATA;
1230 } else {
1231 /* Build an Standard X.25 header */
1232 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1233 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1234 *asmptr++ = (x25->lci >> 0) & 0xFF;
1235 *asmptr++ = X25_DATA;
1236 }
1237
1238 if (qbit)
1239 skb->data[0] |= X25_Q_BIT;
1240 }
1241
1242 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1243 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1244
1245 rc = -ENOTCONN;
1246 if (sk->sk_state != TCP_ESTABLISHED)
1247 goto out_kfree_skb;
1248
1249 if (msg->msg_flags & MSG_OOB)
1250 skb_queue_tail(&x25->interrupt_out_queue, skb);
1251 else {
1252 rc = x25_output(sk, skb);
1253 len = rc;
1254 if (rc < 0)
1255 kfree_skb(skb);
1256 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1257 len++;
1258 }
1259
1260 x25_kick(sk);
1261 rc = len;
1262 out:
1263 release_sock(sk);
1264 return rc;
1265 out_kfree_skb:
1266 kfree_skb(skb);
1267 goto out;
1268 }
1269
1270
1271 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1272 int flags)
1273 {
1274 struct sock *sk = sock->sk;
1275 struct x25_sock *x25 = x25_sk(sk);
1276 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1277 size_t copied;
1278 int qbit, header_len;
1279 struct sk_buff *skb;
1280 unsigned char *asmptr;
1281 int rc = -ENOTCONN;
1282
1283 lock_sock(sk);
1284
1285 if (x25->neighbour == NULL)
1286 goto out;
1287
1288 header_len = x25->neighbour->extended ?
1289 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1290
1291 /*
1292 * This works for seqpacket too. The receiver has ordered the queue for
1293 * us! We do one quick check first though
1294 */
1295 if (sk->sk_state != TCP_ESTABLISHED)
1296 goto out;
1297
1298 if (flags & MSG_OOB) {
1299 rc = -EINVAL;
1300 if (sock_flag(sk, SOCK_URGINLINE) ||
1301 !skb_peek(&x25->interrupt_in_queue))
1302 goto out;
1303
1304 skb = skb_dequeue(&x25->interrupt_in_queue);
1305
1306 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1307 goto out_free_dgram;
1308
1309 skb_pull(skb, X25_STD_MIN_LEN);
1310
1311 /*
1312 * No Q bit information on Interrupt data.
1313 */
1314 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1315 asmptr = skb_push(skb, 1);
1316 *asmptr = 0x00;
1317 }
1318
1319 msg->msg_flags |= MSG_OOB;
1320 } else {
1321 /* Now we can treat all alike */
1322 release_sock(sk);
1323 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1324 flags & MSG_DONTWAIT, &rc);
1325 lock_sock(sk);
1326 if (!skb)
1327 goto out;
1328
1329 if (!pskb_may_pull(skb, header_len))
1330 goto out_free_dgram;
1331
1332 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1333
1334 skb_pull(skb, header_len);
1335
1336 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1337 asmptr = skb_push(skb, 1);
1338 *asmptr = qbit;
1339 }
1340 }
1341
1342 skb_reset_transport_header(skb);
1343 copied = skb->len;
1344
1345 if (copied > size) {
1346 copied = size;
1347 msg->msg_flags |= MSG_TRUNC;
1348 }
1349
1350 /* Currently, each datagram always contains a complete record */
1351 msg->msg_flags |= MSG_EOR;
1352
1353 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1354 if (rc)
1355 goto out_free_dgram;
1356
1357 if (sx25) {
1358 sx25->sx25_family = AF_X25;
1359 sx25->sx25_addr = x25->dest_addr;
1360 msg->msg_namelen = sizeof(*sx25);
1361 }
1362
1363 x25_check_rbuf(sk);
1364 rc = copied;
1365 out_free_dgram:
1366 skb_free_datagram(sk, skb);
1367 out:
1368 release_sock(sk);
1369 return rc;
1370 }
1371
1372
1373 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1374 {
1375 struct sock *sk = sock->sk;
1376 struct x25_sock *x25 = x25_sk(sk);
1377 void __user *argp = (void __user *)arg;
1378 int rc;
1379
1380 switch (cmd) {
1381 case TIOCOUTQ: {
1382 int amount;
1383
1384 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1385 if (amount < 0)
1386 amount = 0;
1387 rc = put_user(amount, (unsigned int __user *)argp);
1388 break;
1389 }
1390
1391 case TIOCINQ: {
1392 struct sk_buff *skb;
1393 int amount = 0;
1394 /*
1395 * These two are safe on a single CPU system as
1396 * only user tasks fiddle here
1397 */
1398 lock_sock(sk);
1399 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1400 amount = skb->len;
1401 release_sock(sk);
1402 rc = put_user(amount, (unsigned int __user *)argp);
1403 break;
1404 }
1405
1406 case SIOCGSTAMP:
1407 rc = -EINVAL;
1408 if (sk)
1409 rc = sock_get_timestamp(sk,
1410 (struct timeval __user *)argp);
1411 break;
1412 case SIOCGSTAMPNS:
1413 rc = -EINVAL;
1414 if (sk)
1415 rc = sock_get_timestampns(sk,
1416 (struct timespec __user *)argp);
1417 break;
1418 case SIOCGIFADDR:
1419 case SIOCSIFADDR:
1420 case SIOCGIFDSTADDR:
1421 case SIOCSIFDSTADDR:
1422 case SIOCGIFBRDADDR:
1423 case SIOCSIFBRDADDR:
1424 case SIOCGIFNETMASK:
1425 case SIOCSIFNETMASK:
1426 case SIOCGIFMETRIC:
1427 case SIOCSIFMETRIC:
1428 rc = -EINVAL;
1429 break;
1430 case SIOCADDRT:
1431 case SIOCDELRT:
1432 rc = -EPERM;
1433 if (!capable(CAP_NET_ADMIN))
1434 break;
1435 rc = x25_route_ioctl(cmd, argp);
1436 break;
1437 case SIOCX25GSUBSCRIP:
1438 rc = x25_subscr_ioctl(cmd, argp);
1439 break;
1440 case SIOCX25SSUBSCRIP:
1441 rc = -EPERM;
1442 if (!capable(CAP_NET_ADMIN))
1443 break;
1444 rc = x25_subscr_ioctl(cmd, argp);
1445 break;
1446 case SIOCX25GFACILITIES: {
1447 lock_sock(sk);
1448 rc = copy_to_user(argp, &x25->facilities,
1449 sizeof(x25->facilities))
1450 ? -EFAULT : 0;
1451 release_sock(sk);
1452 break;
1453 }
1454
1455 case SIOCX25SFACILITIES: {
1456 struct x25_facilities facilities;
1457 rc = -EFAULT;
1458 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1459 break;
1460 rc = -EINVAL;
1461 lock_sock(sk);
1462 if (sk->sk_state != TCP_LISTEN &&
1463 sk->sk_state != TCP_CLOSE)
1464 goto out_fac_release;
1465 if (facilities.pacsize_in < X25_PS16 ||
1466 facilities.pacsize_in > X25_PS4096)
1467 goto out_fac_release;
1468 if (facilities.pacsize_out < X25_PS16 ||
1469 facilities.pacsize_out > X25_PS4096)
1470 goto out_fac_release;
1471 if (facilities.winsize_in < 1 ||
1472 facilities.winsize_in > 127)
1473 goto out_fac_release;
1474 if (facilities.throughput) {
1475 int out = facilities.throughput & 0xf0;
1476 int in = facilities.throughput & 0x0f;
1477 if (!out)
1478 facilities.throughput |=
1479 X25_DEFAULT_THROUGHPUT << 4;
1480 else if (out < 0x30 || out > 0xD0)
1481 goto out_fac_release;
1482 if (!in)
1483 facilities.throughput |=
1484 X25_DEFAULT_THROUGHPUT;
1485 else if (in < 0x03 || in > 0x0D)
1486 goto out_fac_release;
1487 }
1488 if (facilities.reverse &&
1489 (facilities.reverse & 0x81) != 0x81)
1490 goto out_fac_release;
1491 x25->facilities = facilities;
1492 rc = 0;
1493 out_fac_release:
1494 release_sock(sk);
1495 break;
1496 }
1497
1498 case SIOCX25GDTEFACILITIES: {
1499 lock_sock(sk);
1500 rc = copy_to_user(argp, &x25->dte_facilities,
1501 sizeof(x25->dte_facilities));
1502 release_sock(sk);
1503 if (rc)
1504 rc = -EFAULT;
1505 break;
1506 }
1507
1508 case SIOCX25SDTEFACILITIES: {
1509 struct x25_dte_facilities dtefacs;
1510 rc = -EFAULT;
1511 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1512 break;
1513 rc = -EINVAL;
1514 lock_sock(sk);
1515 if (sk->sk_state != TCP_LISTEN &&
1516 sk->sk_state != TCP_CLOSE)
1517 goto out_dtefac_release;
1518 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1519 goto out_dtefac_release;
1520 if (dtefacs.called_len > X25_MAX_AE_LEN)
1521 goto out_dtefac_release;
1522 x25->dte_facilities = dtefacs;
1523 rc = 0;
1524 out_dtefac_release:
1525 release_sock(sk);
1526 break;
1527 }
1528
1529 case SIOCX25GCALLUSERDATA: {
1530 lock_sock(sk);
1531 rc = copy_to_user(argp, &x25->calluserdata,
1532 sizeof(x25->calluserdata))
1533 ? -EFAULT : 0;
1534 release_sock(sk);
1535 break;
1536 }
1537
1538 case SIOCX25SCALLUSERDATA: {
1539 struct x25_calluserdata calluserdata;
1540
1541 rc = -EFAULT;
1542 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1543 break;
1544 rc = -EINVAL;
1545 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1546 break;
1547 lock_sock(sk);
1548 x25->calluserdata = calluserdata;
1549 release_sock(sk);
1550 rc = 0;
1551 break;
1552 }
1553
1554 case SIOCX25GCAUSEDIAG: {
1555 lock_sock(sk);
1556 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1557 ? -EFAULT : 0;
1558 release_sock(sk);
1559 break;
1560 }
1561
1562 case SIOCX25SCAUSEDIAG: {
1563 struct x25_causediag causediag;
1564 rc = -EFAULT;
1565 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1566 break;
1567 lock_sock(sk);
1568 x25->causediag = causediag;
1569 release_sock(sk);
1570 rc = 0;
1571 break;
1572
1573 }
1574
1575 case SIOCX25SCUDMATCHLEN: {
1576 struct x25_subaddr sub_addr;
1577 rc = -EINVAL;
1578 lock_sock(sk);
1579 if(sk->sk_state != TCP_CLOSE)
1580 goto out_cud_release;
1581 rc = -EFAULT;
1582 if (copy_from_user(&sub_addr, argp,
1583 sizeof(sub_addr)))
1584 goto out_cud_release;
1585 rc = -EINVAL;
1586 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1587 goto out_cud_release;
1588 x25->cudmatchlength = sub_addr.cudmatchlength;
1589 rc = 0;
1590 out_cud_release:
1591 release_sock(sk);
1592 break;
1593 }
1594
1595 case SIOCX25CALLACCPTAPPRV: {
1596 rc = -EINVAL;
1597 lock_sock(sk);
1598 if (sk->sk_state == TCP_CLOSE) {
1599 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1600 rc = 0;
1601 }
1602 release_sock(sk);
1603 break;
1604 }
1605
1606 case SIOCX25SENDCALLACCPT: {
1607 rc = -EINVAL;
1608 lock_sock(sk);
1609 if (sk->sk_state != TCP_ESTABLISHED)
1610 goto out_sendcallaccpt_release;
1611 /* must call accptapprv above */
1612 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1613 goto out_sendcallaccpt_release;
1614 x25_write_internal(sk, X25_CALL_ACCEPTED);
1615 x25->state = X25_STATE_3;
1616 rc = 0;
1617 out_sendcallaccpt_release:
1618 release_sock(sk);
1619 break;
1620 }
1621
1622 default:
1623 rc = -ENOIOCTLCMD;
1624 break;
1625 }
1626
1627 return rc;
1628 }
1629
1630 static const struct net_proto_family x25_family_ops = {
1631 .family = AF_X25,
1632 .create = x25_create,
1633 .owner = THIS_MODULE,
1634 };
1635
1636 #ifdef CONFIG_COMPAT
1637 static int compat_x25_subscr_ioctl(unsigned int cmd,
1638 struct compat_x25_subscrip_struct __user *x25_subscr32)
1639 {
1640 struct compat_x25_subscrip_struct x25_subscr;
1641 struct x25_neigh *nb;
1642 struct net_device *dev;
1643 int rc = -EINVAL;
1644
1645 rc = -EFAULT;
1646 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1647 goto out;
1648
1649 rc = -EINVAL;
1650 dev = x25_dev_get(x25_subscr.device);
1651 if (dev == NULL)
1652 goto out;
1653
1654 nb = x25_get_neigh(dev);
1655 if (nb == NULL)
1656 goto out_dev_put;
1657
1658 dev_put(dev);
1659
1660 if (cmd == SIOCX25GSUBSCRIP) {
1661 read_lock_bh(&x25_neigh_list_lock);
1662 x25_subscr.extended = nb->extended;
1663 x25_subscr.global_facil_mask = nb->global_facil_mask;
1664 read_unlock_bh(&x25_neigh_list_lock);
1665 rc = copy_to_user(x25_subscr32, &x25_subscr,
1666 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1667 } else {
1668 rc = -EINVAL;
1669 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1670 rc = 0;
1671 write_lock_bh(&x25_neigh_list_lock);
1672 nb->extended = x25_subscr.extended;
1673 nb->global_facil_mask = x25_subscr.global_facil_mask;
1674 write_unlock_bh(&x25_neigh_list_lock);
1675 }
1676 }
1677 x25_neigh_put(nb);
1678 out:
1679 return rc;
1680 out_dev_put:
1681 dev_put(dev);
1682 goto out;
1683 }
1684
1685 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1686 unsigned long arg)
1687 {
1688 void __user *argp = compat_ptr(arg);
1689 struct sock *sk = sock->sk;
1690
1691 int rc = -ENOIOCTLCMD;
1692
1693 switch(cmd) {
1694 case TIOCOUTQ:
1695 case TIOCINQ:
1696 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1697 break;
1698 case SIOCGSTAMP:
1699 rc = -EINVAL;
1700 if (sk)
1701 rc = compat_sock_get_timestamp(sk,
1702 (struct timeval __user*)argp);
1703 break;
1704 case SIOCGSTAMPNS:
1705 rc = -EINVAL;
1706 if (sk)
1707 rc = compat_sock_get_timestampns(sk,
1708 (struct timespec __user*)argp);
1709 break;
1710 case SIOCGIFADDR:
1711 case SIOCSIFADDR:
1712 case SIOCGIFDSTADDR:
1713 case SIOCSIFDSTADDR:
1714 case SIOCGIFBRDADDR:
1715 case SIOCSIFBRDADDR:
1716 case SIOCGIFNETMASK:
1717 case SIOCSIFNETMASK:
1718 case SIOCGIFMETRIC:
1719 case SIOCSIFMETRIC:
1720 rc = -EINVAL;
1721 break;
1722 case SIOCADDRT:
1723 case SIOCDELRT:
1724 rc = -EPERM;
1725 if (!capable(CAP_NET_ADMIN))
1726 break;
1727 rc = x25_route_ioctl(cmd, argp);
1728 break;
1729 case SIOCX25GSUBSCRIP:
1730 rc = compat_x25_subscr_ioctl(cmd, argp);
1731 break;
1732 case SIOCX25SSUBSCRIP:
1733 rc = -EPERM;
1734 if (!capable(CAP_NET_ADMIN))
1735 break;
1736 rc = compat_x25_subscr_ioctl(cmd, argp);
1737 break;
1738 case SIOCX25GFACILITIES:
1739 case SIOCX25SFACILITIES:
1740 case SIOCX25GDTEFACILITIES:
1741 case SIOCX25SDTEFACILITIES:
1742 case SIOCX25GCALLUSERDATA:
1743 case SIOCX25SCALLUSERDATA:
1744 case SIOCX25GCAUSEDIAG:
1745 case SIOCX25SCAUSEDIAG:
1746 case SIOCX25SCUDMATCHLEN:
1747 case SIOCX25CALLACCPTAPPRV:
1748 case SIOCX25SENDCALLACCPT:
1749 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1750 break;
1751 default:
1752 rc = -ENOIOCTLCMD;
1753 break;
1754 }
1755 return rc;
1756 }
1757 #endif
1758
1759 static const struct proto_ops x25_proto_ops = {
1760 .family = AF_X25,
1761 .owner = THIS_MODULE,
1762 .release = x25_release,
1763 .bind = x25_bind,
1764 .connect = x25_connect,
1765 .socketpair = sock_no_socketpair,
1766 .accept = x25_accept,
1767 .getname = x25_getname,
1768 .poll = datagram_poll,
1769 .ioctl = x25_ioctl,
1770 #ifdef CONFIG_COMPAT
1771 .compat_ioctl = compat_x25_ioctl,
1772 #endif
1773 .listen = x25_listen,
1774 .shutdown = sock_no_shutdown,
1775 .setsockopt = x25_setsockopt,
1776 .getsockopt = x25_getsockopt,
1777 .sendmsg = x25_sendmsg,
1778 .recvmsg = x25_recvmsg,
1779 .mmap = sock_no_mmap,
1780 .sendpage = sock_no_sendpage,
1781 };
1782
1783 static struct packet_type x25_packet_type __read_mostly = {
1784 .type = cpu_to_be16(ETH_P_X25),
1785 .func = x25_lapb_receive_frame,
1786 };
1787
1788 static struct notifier_block x25_dev_notifier = {
1789 .notifier_call = x25_device_event,
1790 };
1791
1792 void x25_kill_by_neigh(struct x25_neigh *nb)
1793 {
1794 struct sock *s;
1795
1796 write_lock_bh(&x25_list_lock);
1797
1798 sk_for_each(s, &x25_list)
1799 if (x25_sk(s)->neighbour == nb)
1800 x25_disconnect(s, ENETUNREACH, 0, 0);
1801
1802 write_unlock_bh(&x25_list_lock);
1803
1804 /* Remove any related forwards */
1805 x25_clear_forward_by_dev(nb->dev);
1806 }
1807
1808 static int __init x25_init(void)
1809 {
1810 int rc;
1811
1812 rc = proto_register(&x25_proto, 0);
1813 if (rc)
1814 goto out;
1815
1816 rc = sock_register(&x25_family_ops);
1817 if (rc)
1818 goto out_proto;
1819
1820 dev_add_pack(&x25_packet_type);
1821
1822 rc = register_netdevice_notifier(&x25_dev_notifier);
1823 if (rc)
1824 goto out_sock;
1825
1826 rc = x25_register_sysctl();
1827 if (rc)
1828 goto out_dev;
1829
1830 rc = x25_proc_init();
1831 if (rc)
1832 goto out_sysctl;
1833
1834 pr_info("Linux Version 0.2\n");
1835
1836 out:
1837 return rc;
1838 out_sysctl:
1839 x25_unregister_sysctl();
1840 out_dev:
1841 unregister_netdevice_notifier(&x25_dev_notifier);
1842 out_sock:
1843 dev_remove_pack(&x25_packet_type);
1844 sock_unregister(AF_X25);
1845 out_proto:
1846 proto_unregister(&x25_proto);
1847 goto out;
1848 }
1849 module_init(x25_init);
1850
1851 static void __exit x25_exit(void)
1852 {
1853 x25_proc_exit();
1854 x25_link_free();
1855 x25_route_free();
1856
1857 x25_unregister_sysctl();
1858
1859 unregister_netdevice_notifier(&x25_dev_notifier);
1860
1861 dev_remove_pack(&x25_packet_type);
1862
1863 sock_unregister(AF_X25);
1864 proto_unregister(&x25_proto);
1865 }
1866 module_exit(x25_exit);
1867
1868 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1869 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1870 MODULE_LICENSE("GPL");
1871 MODULE_ALIAS_NETPROTO(PF_X25);
Linux with added FPC-III support