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Linux 4.19.133
[linux/fpc-iii.git] / net / x25 / af_x25.c
blobbd1cbbfe5924bf7fccda5d844b908fb5f76985c5
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/signal.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 <linux/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 const 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(struct timer_list *t)
376 {
377 struct sock *sk = from_timer(sk, t, sk_timer);
378
379 x25_destroy_socket_from_timer(sk);
380 }
381
382 /*
383 * This is called from user mode and the timers. Thus it protects itself
384 * against interrupt users but doesn't worry about being called during
385 * work. Once it is removed from the queue no interrupt or bottom half
386 * will touch it and we are (fairly 8-) ) safe.
387 * Not static as it's used by the timer
388 */
389 static void __x25_destroy_socket(struct sock *sk)
390 {
391 struct sk_buff *skb;
392
393 x25_stop_heartbeat(sk);
394 x25_stop_timer(sk);
395
396 x25_remove_socket(sk);
397 x25_clear_queues(sk); /* Flush the queues */
398
399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
400 if (skb->sk != sk) { /* A pending connection */
401 /*
402 * Queue the unaccepted socket for death
403 */
404 skb->sk->sk_state = TCP_LISTEN;
405 sock_set_flag(skb->sk, SOCK_DEAD);
406 x25_start_heartbeat(skb->sk);
407 x25_sk(skb->sk)->state = X25_STATE_0;
408 }
409
410 kfree_skb(skb);
411 }
412
413 if (sk_has_allocations(sk)) {
414 /* Defer: outstanding buffers */
415 sk->sk_timer.expires = jiffies + 10 * HZ;
416 sk->sk_timer.function = x25_destroy_timer;
417 add_timer(&sk->sk_timer);
418 } else {
419 /* drop last reference so sock_put will free */
420 __sock_put(sk);
421 }
422 }
423
424 void x25_destroy_socket_from_timer(struct sock *sk)
425 {
426 sock_hold(sk);
427 bh_lock_sock(sk);
428 __x25_destroy_socket(sk);
429 bh_unlock_sock(sk);
430 sock_put(sk);
431 }
432
433 /*
434 * Handling for system calls applied via the various interfaces to a
435 * X.25 socket object.
436 */
437
438 static int x25_setsockopt(struct socket *sock, int level, int optname,
439 char __user *optval, unsigned int optlen)
440 {
441 int opt;
442 struct sock *sk = sock->sk;
443 int rc = -ENOPROTOOPT;
444
445 if (level != SOL_X25 || optname != X25_QBITINCL)
446 goto out;
447
448 rc = -EINVAL;
449 if (optlen < sizeof(int))
450 goto out;
451
452 rc = -EFAULT;
453 if (get_user(opt, (int __user *)optval))
454 goto out;
455
456 if (opt)
457 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
458 else
459 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460 rc = 0;
461 out:
462 return rc;
463 }
464
465 static int x25_getsockopt(struct socket *sock, int level, int optname,
466 char __user *optval, int __user *optlen)
467 {
468 struct sock *sk = sock->sk;
469 int val, len, rc = -ENOPROTOOPT;
470
471 if (level != SOL_X25 || optname != X25_QBITINCL)
472 goto out;
473
474 rc = -EFAULT;
475 if (get_user(len, optlen))
476 goto out;
477
478 len = min_t(unsigned int, len, sizeof(int));
479
480 rc = -EINVAL;
481 if (len < 0)
482 goto out;
483
484 rc = -EFAULT;
485 if (put_user(len, optlen))
486 goto out;
487
488 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
489 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
490 out:
491 return rc;
492 }
493
494 static int x25_listen(struct socket *sock, int backlog)
495 {
496 struct sock *sk = sock->sk;
497 int rc = -EOPNOTSUPP;
498
499 lock_sock(sk);
500 if (sk->sk_state != TCP_LISTEN) {
501 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
502 sk->sk_max_ack_backlog = backlog;
503 sk->sk_state = TCP_LISTEN;
504 rc = 0;
505 }
506 release_sock(sk);
507
508 return rc;
509 }
510
511 static struct proto x25_proto = {
512 .name = "X25",
513 .owner = THIS_MODULE,
514 .obj_size = sizeof(struct x25_sock),
515 };
516
517 static struct sock *x25_alloc_socket(struct net *net, int kern)
518 {
519 struct x25_sock *x25;
520 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
521
522 if (!sk)
523 goto out;
524
525 sock_init_data(NULL, sk);
526
527 x25 = x25_sk(sk);
528 skb_queue_head_init(&x25->ack_queue);
529 skb_queue_head_init(&x25->fragment_queue);
530 skb_queue_head_init(&x25->interrupt_in_queue);
531 skb_queue_head_init(&x25->interrupt_out_queue);
532 out:
533 return sk;
534 }
535
536 static int x25_create(struct net *net, struct socket *sock, int protocol,
537 int kern)
538 {
539 struct sock *sk;
540 struct x25_sock *x25;
541 int rc = -EAFNOSUPPORT;
542
543 if (!net_eq(net, &init_net))
544 goto out;
545
546 rc = -ESOCKTNOSUPPORT;
547 if (sock->type != SOCK_SEQPACKET)
548 goto out;
549
550 rc = -EINVAL;
551 if (protocol)
552 goto out;
553
554 rc = -ENOBUFS;
555 if ((sk = x25_alloc_socket(net, kern)) == NULL)
556 goto out;
557
558 x25 = x25_sk(sk);
559
560 sock_init_data(sock, sk);
561
562 x25_init_timers(sk);
563
564 sock->ops = &x25_proto_ops;
565 sk->sk_protocol = protocol;
566 sk->sk_backlog_rcv = x25_backlog_rcv;
567
568 x25->t21 = sysctl_x25_call_request_timeout;
569 x25->t22 = sysctl_x25_reset_request_timeout;
570 x25->t23 = sysctl_x25_clear_request_timeout;
571 x25->t2 = sysctl_x25_ack_holdback_timeout;
572 x25->state = X25_STATE_0;
573 x25->cudmatchlength = 0;
574 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
575 /* on call accept */
576
577 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
578 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
579 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
580 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
581 x25->facilities.throughput = 0; /* by default don't negotiate
582 throughput */
583 x25->facilities.reverse = X25_DEFAULT_REVERSE;
584 x25->dte_facilities.calling_len = 0;
585 x25->dte_facilities.called_len = 0;
586 memset(x25->dte_facilities.called_ae, '\0',
587 sizeof(x25->dte_facilities.called_ae));
588 memset(x25->dte_facilities.calling_ae, '\0',
589 sizeof(x25->dte_facilities.calling_ae));
590
591 rc = 0;
592 out:
593 return rc;
594 }
595
596 static struct sock *x25_make_new(struct sock *osk)
597 {
598 struct sock *sk = NULL;
599 struct x25_sock *x25, *ox25;
600
601 if (osk->sk_type != SOCK_SEQPACKET)
602 goto out;
603
604 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
605 goto out;
606
607 x25 = x25_sk(sk);
608
609 sk->sk_type = osk->sk_type;
610 sk->sk_priority = osk->sk_priority;
611 sk->sk_protocol = osk->sk_protocol;
612 sk->sk_rcvbuf = osk->sk_rcvbuf;
613 sk->sk_sndbuf = osk->sk_sndbuf;
614 sk->sk_state = TCP_ESTABLISHED;
615 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
616 sock_copy_flags(sk, osk);
617
618 ox25 = x25_sk(osk);
619 x25->t21 = ox25->t21;
620 x25->t22 = ox25->t22;
621 x25->t23 = ox25->t23;
622 x25->t2 = ox25->t2;
623 x25->flags = ox25->flags;
624 x25->facilities = ox25->facilities;
625 x25->dte_facilities = ox25->dte_facilities;
626 x25->cudmatchlength = ox25->cudmatchlength;
627
628 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
629 x25_init_timers(sk);
630 out:
631 return sk;
632 }
633
634 static int x25_release(struct socket *sock)
635 {
636 struct sock *sk = sock->sk;
637 struct x25_sock *x25;
638
639 if (!sk)
640 return 0;
641
642 x25 = x25_sk(sk);
643
644 sock_hold(sk);
645 lock_sock(sk);
646 switch (x25->state) {
647
648 case X25_STATE_0:
649 case X25_STATE_2:
650 x25_disconnect(sk, 0, 0, 0);
651 __x25_destroy_socket(sk);
652 goto out;
653
654 case X25_STATE_1:
655 case X25_STATE_3:
656 case X25_STATE_4:
657 x25_clear_queues(sk);
658 x25_write_internal(sk, X25_CLEAR_REQUEST);
659 x25_start_t23timer(sk);
660 x25->state = X25_STATE_2;
661 sk->sk_state = TCP_CLOSE;
662 sk->sk_shutdown |= SEND_SHUTDOWN;
663 sk->sk_state_change(sk);
664 sock_set_flag(sk, SOCK_DEAD);
665 sock_set_flag(sk, SOCK_DESTROY);
666 break;
667 }
668
669 sock_orphan(sk);
670 out:
671 release_sock(sk);
672 sock_put(sk);
673 return 0;
674 }
675
676 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
677 {
678 struct sock *sk = sock->sk;
679 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
680 int len, i, rc = 0;
681
682 if (addr_len != sizeof(struct sockaddr_x25) ||
683 addr->sx25_family != AF_X25) {
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 goto out;
779
780 rc = -ENETUNREACH;
781 rt = x25_get_route(&addr->sx25_addr);
782 if (!rt)
783 goto out;
784
785 x25->neighbour = x25_get_neigh(rt->dev);
786 if (!x25->neighbour)
787 goto out_put_route;
788
789 x25_limit_facilities(&x25->facilities, x25->neighbour);
790
791 x25->lci = x25_new_lci(x25->neighbour);
792 if (!x25->lci)
793 goto out_put_neigh;
794
795 rc = -EINVAL;
796 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
797 goto out_put_neigh;
798
799 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
800 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
801
802 x25->dest_addr = addr->sx25_addr;
803
804 /* Move to connecting socket, start sending Connect Requests */
805 sock->state = SS_CONNECTING;
806 sk->sk_state = TCP_SYN_SENT;
807
808 x25->state = X25_STATE_1;
809
810 x25_write_internal(sk, X25_CALL_REQUEST);
811
812 x25_start_heartbeat(sk);
813 x25_start_t21timer(sk);
814
815 /* Now the loop */
816 rc = -EINPROGRESS;
817 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
818 goto out;
819
820 rc = x25_wait_for_connection_establishment(sk);
821 if (rc)
822 goto out_put_neigh;
823
824 sock->state = SS_CONNECTED;
825 rc = 0;
826 out_put_neigh:
827 if (rc) {
828 read_lock_bh(&x25_list_lock);
829 x25_neigh_put(x25->neighbour);
830 x25->neighbour = NULL;
831 read_unlock_bh(&x25_list_lock);
832 x25->state = X25_STATE_0;
833 }
834 out_put_route:
835 x25_route_put(rt);
836 out:
837 release_sock(sk);
838 return rc;
839 }
840
841 static int x25_wait_for_data(struct sock *sk, long timeout)
842 {
843 DECLARE_WAITQUEUE(wait, current);
844 int rc = 0;
845
846 add_wait_queue_exclusive(sk_sleep(sk), &wait);
847 for (;;) {
848 __set_current_state(TASK_INTERRUPTIBLE);
849 if (sk->sk_shutdown & RCV_SHUTDOWN)
850 break;
851 rc = -ERESTARTSYS;
852 if (signal_pending(current))
853 break;
854 rc = -EAGAIN;
855 if (!timeout)
856 break;
857 rc = 0;
858 if (skb_queue_empty(&sk->sk_receive_queue)) {
859 release_sock(sk);
860 timeout = schedule_timeout(timeout);
861 lock_sock(sk);
862 } else
863 break;
864 }
865 __set_current_state(TASK_RUNNING);
866 remove_wait_queue(sk_sleep(sk), &wait);
867 return rc;
868 }
869
870 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
871 bool kern)
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 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 rc = 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 makex25->neighbour = nb;
1053 makex25->facilities = facilities;
1054 makex25->dte_facilities= dte_facilities;
1055 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1056 /* ensure no reverse facil on accept */
1057 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1058 /* ensure no calling address extension on accept */
1059 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1060 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1061
1062 /* Normally all calls are accepted immediately */
1063 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1064 x25_write_internal(make, X25_CALL_ACCEPTED);
1065 makex25->state = X25_STATE_3;
1066 }
1067
1068 /*
1069 * Incoming Call User Data.
1070 */
1071 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1072 makex25->calluserdata.cudlength = skb->len;
1073
1074 sk->sk_ack_backlog++;
1075
1076 x25_insert_socket(make);
1077
1078 skb_queue_head(&sk->sk_receive_queue, skb);
1079
1080 x25_start_heartbeat(make);
1081
1082 if (!sock_flag(sk, SOCK_DEAD))
1083 sk->sk_data_ready(sk);
1084 rc = 1;
1085 sock_put(sk);
1086 out:
1087 return rc;
1088 out_sock_put:
1089 sock_put(sk);
1090 out_clear_request:
1091 rc = 0;
1092 x25_transmit_clear_request(nb, lci, 0x01);
1093 goto out;
1094 }
1095
1096 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1097 {
1098 struct sock *sk = sock->sk;
1099 struct x25_sock *x25 = x25_sk(sk);
1100 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1101 struct sockaddr_x25 sx25;
1102 struct sk_buff *skb;
1103 unsigned char *asmptr;
1104 int noblock = msg->msg_flags & MSG_DONTWAIT;
1105 size_t size;
1106 int qbit = 0, rc = -EINVAL;
1107
1108 lock_sock(sk);
1109 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1110 goto out;
1111
1112 /* we currently don't support segmented records at the user interface */
1113 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1114 goto out;
1115
1116 rc = -EADDRNOTAVAIL;
1117 if (sock_flag(sk, SOCK_ZAPPED))
1118 goto out;
1119
1120 rc = -EPIPE;
1121 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1122 send_sig(SIGPIPE, current, 0);
1123 goto out;
1124 }
1125
1126 rc = -ENETUNREACH;
1127 if (!x25->neighbour)
1128 goto out;
1129
1130 if (usx25) {
1131 rc = -EINVAL;
1132 if (msg->msg_namelen < sizeof(sx25))
1133 goto out;
1134 memcpy(&sx25, usx25, sizeof(sx25));
1135 rc = -EISCONN;
1136 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1137 goto out;
1138 rc = -EINVAL;
1139 if (sx25.sx25_family != AF_X25)
1140 goto out;
1141 } else {
1142 /*
1143 * FIXME 1003.1g - if the socket is like this because
1144 * it has become closed (not started closed) we ought
1145 * to SIGPIPE, EPIPE;
1146 */
1147 rc = -ENOTCONN;
1148 if (sk->sk_state != TCP_ESTABLISHED)
1149 goto out;
1150
1151 sx25.sx25_family = AF_X25;
1152 sx25.sx25_addr = x25->dest_addr;
1153 }
1154
1155 /* Sanity check the packet size */
1156 if (len > 65535) {
1157 rc = -EMSGSIZE;
1158 goto out;
1159 }
1160
1161 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1162
1163 /* Build a packet */
1164 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1165
1166 if ((msg->msg_flags & MSG_OOB) && len > 32)
1167 len = 32;
1168
1169 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1170
1171 release_sock(sk);
1172 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1173 lock_sock(sk);
1174 if (!skb)
1175 goto out;
1176 X25_SKB_CB(skb)->flags = msg->msg_flags;
1177
1178 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1179
1180 /*
1181 * Put the data on the end
1182 */
1183 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1184
1185 skb_reset_transport_header(skb);
1186 skb_put(skb, len);
1187
1188 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1189 if (rc)
1190 goto out_kfree_skb;
1191
1192 /*
1193 * If the Q BIT Include socket option is in force, the first
1194 * byte of the user data is the logical value of the Q Bit.
1195 */
1196 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1197 if (!pskb_may_pull(skb, 1))
1198 goto out_kfree_skb;
1199
1200 qbit = skb->data[0];
1201 skb_pull(skb, 1);
1202 }
1203
1204 /*
1205 * Push down the X.25 header
1206 */
1207 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1208
1209 if (msg->msg_flags & MSG_OOB) {
1210 if (x25->neighbour->extended) {
1211 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1212 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1213 *asmptr++ = (x25->lci >> 0) & 0xFF;
1214 *asmptr++ = X25_INTERRUPT;
1215 } else {
1216 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1217 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1218 *asmptr++ = (x25->lci >> 0) & 0xFF;
1219 *asmptr++ = X25_INTERRUPT;
1220 }
1221 } else {
1222 if (x25->neighbour->extended) {
1223 /* Build an Extended X.25 header */
1224 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1225 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1226 *asmptr++ = (x25->lci >> 0) & 0xFF;
1227 *asmptr++ = X25_DATA;
1228 *asmptr++ = X25_DATA;
1229 } else {
1230 /* Build an Standard X.25 header */
1231 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1232 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1233 *asmptr++ = (x25->lci >> 0) & 0xFF;
1234 *asmptr++ = X25_DATA;
1235 }
1236
1237 if (qbit)
1238 skb->data[0] |= X25_Q_BIT;
1239 }
1240
1241 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1242 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1243
1244 rc = -ENOTCONN;
1245 if (sk->sk_state != TCP_ESTABLISHED)
1246 goto out_kfree_skb;
1247
1248 if (msg->msg_flags & MSG_OOB)
1249 skb_queue_tail(&x25->interrupt_out_queue, skb);
1250 else {
1251 rc = x25_output(sk, skb);
1252 len = rc;
1253 if (rc < 0)
1254 kfree_skb(skb);
1255 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1256 len++;
1257 }
1258
1259 x25_kick(sk);
1260 rc = len;
1261 out:
1262 release_sock(sk);
1263 return rc;
1264 out_kfree_skb:
1265 kfree_skb(skb);
1266 goto out;
1267 }
1268
1269
1270 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1271 int flags)
1272 {
1273 struct sock *sk = sock->sk;
1274 struct x25_sock *x25 = x25_sk(sk);
1275 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1276 size_t copied;
1277 int qbit, header_len;
1278 struct sk_buff *skb;
1279 unsigned char *asmptr;
1280 int rc = -ENOTCONN;
1281
1282 lock_sock(sk);
1283
1284 if (x25->neighbour == NULL)
1285 goto out;
1286
1287 header_len = x25->neighbour->extended ?
1288 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1289
1290 /*
1291 * This works for seqpacket too. The receiver has ordered the queue for
1292 * us! We do one quick check first though
1293 */
1294 if (sk->sk_state != TCP_ESTABLISHED)
1295 goto out;
1296
1297 if (flags & MSG_OOB) {
1298 rc = -EINVAL;
1299 if (sock_flag(sk, SOCK_URGINLINE) ||
1300 !skb_peek(&x25->interrupt_in_queue))
1301 goto out;
1302
1303 skb = skb_dequeue(&x25->interrupt_in_queue);
1304
1305 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1306 goto out_free_dgram;
1307
1308 skb_pull(skb, X25_STD_MIN_LEN);
1309
1310 /*
1311 * No Q bit information on Interrupt data.
1312 */
1313 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1314 asmptr = skb_push(skb, 1);
1315 *asmptr = 0x00;
1316 }
1317
1318 msg->msg_flags |= MSG_OOB;
1319 } else {
1320 /* Now we can treat all alike */
1321 release_sock(sk);
1322 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1323 flags & MSG_DONTWAIT, &rc);
1324 lock_sock(sk);
1325 if (!skb)
1326 goto out;
1327
1328 if (!pskb_may_pull(skb, header_len))
1329 goto out_free_dgram;
1330
1331 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1332
1333 skb_pull(skb, header_len);
1334
1335 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1336 asmptr = skb_push(skb, 1);
1337 *asmptr = qbit;
1338 }
1339 }
1340
1341 skb_reset_transport_header(skb);
1342 copied = skb->len;
1343
1344 if (copied > size) {
1345 copied = size;
1346 msg->msg_flags |= MSG_TRUNC;
1347 }
1348
1349 /* Currently, each datagram always contains a complete record */
1350 msg->msg_flags |= MSG_EOR;
1351
1352 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1353 if (rc)
1354 goto out_free_dgram;
1355
1356 if (sx25) {
1357 sx25->sx25_family = AF_X25;
1358 sx25->sx25_addr = x25->dest_addr;
1359 msg->msg_namelen = sizeof(*sx25);
1360 }
1361
1362 x25_check_rbuf(sk);
1363 rc = copied;
1364 out_free_dgram:
1365 skb_free_datagram(sk, skb);
1366 out:
1367 release_sock(sk);
1368 return rc;
1369 }
1370
1371
1372 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1373 {
1374 struct sock *sk = sock->sk;
1375 struct x25_sock *x25 = x25_sk(sk);
1376 void __user *argp = (void __user *)arg;
1377 int rc;
1378
1379 switch (cmd) {
1380 case TIOCOUTQ: {
1381 int amount;
1382
1383 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1384 if (amount < 0)
1385 amount = 0;
1386 rc = put_user(amount, (unsigned int __user *)argp);
1387 break;
1388 }
1389
1390 case TIOCINQ: {
1391 struct sk_buff *skb;
1392 int amount = 0;
1393 /*
1394 * These two are safe on a single CPU system as
1395 * only user tasks fiddle here
1396 */
1397 lock_sock(sk);
1398 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1399 amount = skb->len;
1400 release_sock(sk);
1401 rc = put_user(amount, (unsigned int __user *)argp);
1402 break;
1403 }
1404
1405 case SIOCGSTAMP:
1406 rc = -EINVAL;
1407 if (sk)
1408 rc = sock_get_timestamp(sk,
1409 (struct timeval __user *)argp);
1410 break;
1411 case SIOCGSTAMPNS:
1412 rc = -EINVAL;
1413 if (sk)
1414 rc = sock_get_timestampns(sk,
1415 (struct timespec __user *)argp);
1416 break;
1417 case SIOCGIFADDR:
1418 case SIOCSIFADDR:
1419 case SIOCGIFDSTADDR:
1420 case SIOCSIFDSTADDR:
1421 case SIOCGIFBRDADDR:
1422 case SIOCSIFBRDADDR:
1423 case SIOCGIFNETMASK:
1424 case SIOCSIFNETMASK:
1425 case SIOCGIFMETRIC:
1426 case SIOCSIFMETRIC:
1427 rc = -EINVAL;
1428 break;
1429 case SIOCADDRT:
1430 case SIOCDELRT:
1431 rc = -EPERM;
1432 if (!capable(CAP_NET_ADMIN))
1433 break;
1434 rc = x25_route_ioctl(cmd, argp);
1435 break;
1436 case SIOCX25GSUBSCRIP:
1437 rc = x25_subscr_ioctl(cmd, argp);
1438 break;
1439 case SIOCX25SSUBSCRIP:
1440 rc = -EPERM;
1441 if (!capable(CAP_NET_ADMIN))
1442 break;
1443 rc = x25_subscr_ioctl(cmd, argp);
1444 break;
1445 case SIOCX25GFACILITIES: {
1446 lock_sock(sk);
1447 rc = copy_to_user(argp, &x25->facilities,
1448 sizeof(x25->facilities))
1449 ? -EFAULT : 0;
1450 release_sock(sk);
1451 break;
1452 }
1453
1454 case SIOCX25SFACILITIES: {
1455 struct x25_facilities facilities;
1456 rc = -EFAULT;
1457 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1458 break;
1459 rc = -EINVAL;
1460 lock_sock(sk);
1461 if (sk->sk_state != TCP_LISTEN &&
1462 sk->sk_state != TCP_CLOSE)
1463 goto out_fac_release;
1464 if (facilities.pacsize_in < X25_PS16 ||
1465 facilities.pacsize_in > X25_PS4096)
1466 goto out_fac_release;
1467 if (facilities.pacsize_out < X25_PS16 ||
1468 facilities.pacsize_out > X25_PS4096)
1469 goto out_fac_release;
1470 if (facilities.winsize_in < 1 ||
1471 facilities.winsize_in > 127)
1472 goto out_fac_release;
1473 if (facilities.throughput) {
1474 int out = facilities.throughput & 0xf0;
1475 int in = facilities.throughput & 0x0f;
1476 if (!out)
1477 facilities.throughput |=
1478 X25_DEFAULT_THROUGHPUT << 4;
1479 else if (out < 0x30 || out > 0xD0)
1480 goto out_fac_release;
1481 if (!in)
1482 facilities.throughput |=
1483 X25_DEFAULT_THROUGHPUT;
1484 else if (in < 0x03 || in > 0x0D)
1485 goto out_fac_release;
1486 }
1487 if (facilities.reverse &&
1488 (facilities.reverse & 0x81) != 0x81)
1489 goto out_fac_release;
1490 x25->facilities = facilities;
1491 rc = 0;
1492 out_fac_release:
1493 release_sock(sk);
1494 break;
1495 }
1496
1497 case SIOCX25GDTEFACILITIES: {
1498 lock_sock(sk);
1499 rc = copy_to_user(argp, &x25->dte_facilities,
1500 sizeof(x25->dte_facilities));
1501 release_sock(sk);
1502 if (rc)
1503 rc = -EFAULT;
1504 break;
1505 }
1506
1507 case SIOCX25SDTEFACILITIES: {
1508 struct x25_dte_facilities dtefacs;
1509 rc = -EFAULT;
1510 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1511 break;
1512 rc = -EINVAL;
1513 lock_sock(sk);
1514 if (sk->sk_state != TCP_LISTEN &&
1515 sk->sk_state != TCP_CLOSE)
1516 goto out_dtefac_release;
1517 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1518 goto out_dtefac_release;
1519 if (dtefacs.called_len > X25_MAX_AE_LEN)
1520 goto out_dtefac_release;
1521 x25->dte_facilities = dtefacs;
1522 rc = 0;
1523 out_dtefac_release:
1524 release_sock(sk);
1525 break;
1526 }
1527
1528 case SIOCX25GCALLUSERDATA: {
1529 lock_sock(sk);
1530 rc = copy_to_user(argp, &x25->calluserdata,
1531 sizeof(x25->calluserdata))
1532 ? -EFAULT : 0;
1533 release_sock(sk);
1534 break;
1535 }
1536
1537 case SIOCX25SCALLUSERDATA: {
1538 struct x25_calluserdata calluserdata;
1539
1540 rc = -EFAULT;
1541 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1542 break;
1543 rc = -EINVAL;
1544 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1545 break;
1546 lock_sock(sk);
1547 x25->calluserdata = calluserdata;
1548 release_sock(sk);
1549 rc = 0;
1550 break;
1551 }
1552
1553 case SIOCX25GCAUSEDIAG: {
1554 lock_sock(sk);
1555 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1556 ? -EFAULT : 0;
1557 release_sock(sk);
1558 break;
1559 }
1560
1561 case SIOCX25SCAUSEDIAG: {
1562 struct x25_causediag causediag;
1563 rc = -EFAULT;
1564 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1565 break;
1566 lock_sock(sk);
1567 x25->causediag = causediag;
1568 release_sock(sk);
1569 rc = 0;
1570 break;
1571
1572 }
1573
1574 case SIOCX25SCUDMATCHLEN: {
1575 struct x25_subaddr sub_addr;
1576 rc = -EINVAL;
1577 lock_sock(sk);
1578 if(sk->sk_state != TCP_CLOSE)
1579 goto out_cud_release;
1580 rc = -EFAULT;
1581 if (copy_from_user(&sub_addr, argp,
1582 sizeof(sub_addr)))
1583 goto out_cud_release;
1584 rc = -EINVAL;
1585 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1586 goto out_cud_release;
1587 x25->cudmatchlength = sub_addr.cudmatchlength;
1588 rc = 0;
1589 out_cud_release:
1590 release_sock(sk);
1591 break;
1592 }
1593
1594 case SIOCX25CALLACCPTAPPRV: {
1595 rc = -EINVAL;
1596 lock_sock(sk);
1597 if (sk->sk_state == TCP_CLOSE) {
1598 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1599 rc = 0;
1600 }
1601 release_sock(sk);
1602 break;
1603 }
1604
1605 case SIOCX25SENDCALLACCPT: {
1606 rc = -EINVAL;
1607 lock_sock(sk);
1608 if (sk->sk_state != TCP_ESTABLISHED)
1609 goto out_sendcallaccpt_release;
1610 /* must call accptapprv above */
1611 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1612 goto out_sendcallaccpt_release;
1613 x25_write_internal(sk, X25_CALL_ACCEPTED);
1614 x25->state = X25_STATE_3;
1615 rc = 0;
1616 out_sendcallaccpt_release:
1617 release_sock(sk);
1618 break;
1619 }
1620
1621 default:
1622 rc = -ENOIOCTLCMD;
1623 break;
1624 }
1625
1626 return rc;
1627 }
1628
1629 static const struct net_proto_family x25_family_ops = {
1630 .family = AF_X25,
1631 .create = x25_create,
1632 .owner = THIS_MODULE,
1633 };
1634
1635 #ifdef CONFIG_COMPAT
1636 static int compat_x25_subscr_ioctl(unsigned int cmd,
1637 struct compat_x25_subscrip_struct __user *x25_subscr32)
1638 {
1639 struct compat_x25_subscrip_struct x25_subscr;
1640 struct x25_neigh *nb;
1641 struct net_device *dev;
1642 int rc = -EINVAL;
1643
1644 rc = -EFAULT;
1645 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1646 goto out;
1647
1648 rc = -EINVAL;
1649 dev = x25_dev_get(x25_subscr.device);
1650 if (dev == NULL)
1651 goto out;
1652
1653 nb = x25_get_neigh(dev);
1654 if (nb == NULL)
1655 goto out_dev_put;
1656
1657 dev_put(dev);
1658
1659 if (cmd == SIOCX25GSUBSCRIP) {
1660 read_lock_bh(&x25_neigh_list_lock);
1661 x25_subscr.extended = nb->extended;
1662 x25_subscr.global_facil_mask = nb->global_facil_mask;
1663 read_unlock_bh(&x25_neigh_list_lock);
1664 rc = copy_to_user(x25_subscr32, &x25_subscr,
1665 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1666 } else {
1667 rc = -EINVAL;
1668 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1669 rc = 0;
1670 write_lock_bh(&x25_neigh_list_lock);
1671 nb->extended = x25_subscr.extended;
1672 nb->global_facil_mask = x25_subscr.global_facil_mask;
1673 write_unlock_bh(&x25_neigh_list_lock);
1674 }
1675 }
1676 x25_neigh_put(nb);
1677 out:
1678 return rc;
1679 out_dev_put:
1680 dev_put(dev);
1681 goto out;
1682 }
1683
1684 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1685 unsigned long arg)
1686 {
1687 void __user *argp = compat_ptr(arg);
1688 struct sock *sk = sock->sk;
1689
1690 int rc = -ENOIOCTLCMD;
1691
1692 switch(cmd) {
1693 case TIOCOUTQ:
1694 case TIOCINQ:
1695 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1696 break;
1697 case SIOCGSTAMP:
1698 rc = -EINVAL;
1699 if (sk)
1700 rc = compat_sock_get_timestamp(sk,
1701 (struct timeval __user*)argp);
1702 break;
1703 case SIOCGSTAMPNS:
1704 rc = -EINVAL;
1705 if (sk)
1706 rc = compat_sock_get_timestampns(sk,
1707 (struct timespec __user*)argp);
1708 break;
1709 case SIOCGIFADDR:
1710 case SIOCSIFADDR:
1711 case SIOCGIFDSTADDR:
1712 case SIOCSIFDSTADDR:
1713 case SIOCGIFBRDADDR:
1714 case SIOCSIFBRDADDR:
1715 case SIOCGIFNETMASK:
1716 case SIOCSIFNETMASK:
1717 case SIOCGIFMETRIC:
1718 case SIOCSIFMETRIC:
1719 rc = -EINVAL;
1720 break;
1721 case SIOCADDRT:
1722 case SIOCDELRT:
1723 rc = -EPERM;
1724 if (!capable(CAP_NET_ADMIN))
1725 break;
1726 rc = x25_route_ioctl(cmd, argp);
1727 break;
1728 case SIOCX25GSUBSCRIP:
1729 rc = compat_x25_subscr_ioctl(cmd, argp);
1730 break;
1731 case SIOCX25SSUBSCRIP:
1732 rc = -EPERM;
1733 if (!capable(CAP_NET_ADMIN))
1734 break;
1735 rc = compat_x25_subscr_ioctl(cmd, argp);
1736 break;
1737 case SIOCX25GFACILITIES:
1738 case SIOCX25SFACILITIES:
1739 case SIOCX25GDTEFACILITIES:
1740 case SIOCX25SDTEFACILITIES:
1741 case SIOCX25GCALLUSERDATA:
1742 case SIOCX25SCALLUSERDATA:
1743 case SIOCX25GCAUSEDIAG:
1744 case SIOCX25SCAUSEDIAG:
1745 case SIOCX25SCUDMATCHLEN:
1746 case SIOCX25CALLACCPTAPPRV:
1747 case SIOCX25SENDCALLACCPT:
1748 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1749 break;
1750 default:
1751 rc = -ENOIOCTLCMD;
1752 break;
1753 }
1754 return rc;
1755 }
1756 #endif
1757
1758 static const struct proto_ops x25_proto_ops = {
1759 .family = AF_X25,
1760 .owner = THIS_MODULE,
1761 .release = x25_release,
1762 .bind = x25_bind,
1763 .connect = x25_connect,
1764 .socketpair = sock_no_socketpair,
1765 .accept = x25_accept,
1766 .getname = x25_getname,
1767 .poll = datagram_poll,
1768 .ioctl = x25_ioctl,
1769 #ifdef CONFIG_COMPAT
1770 .compat_ioctl = compat_x25_ioctl,
1771 #endif
1772 .listen = x25_listen,
1773 .shutdown = sock_no_shutdown,
1774 .setsockopt = x25_setsockopt,
1775 .getsockopt = x25_getsockopt,
1776 .sendmsg = x25_sendmsg,
1777 .recvmsg = x25_recvmsg,
1778 .mmap = sock_no_mmap,
1779 .sendpage = sock_no_sendpage,
1780 };
1781
1782 static struct packet_type x25_packet_type __read_mostly = {
1783 .type = cpu_to_be16(ETH_P_X25),
1784 .func = x25_lapb_receive_frame,
1785 };
1786
1787 static struct notifier_block x25_dev_notifier = {
1788 .notifier_call = x25_device_event,
1789 };
1790
1791 void x25_kill_by_neigh(struct x25_neigh *nb)
1792 {
1793 struct sock *s;
1794
1795 write_lock_bh(&x25_list_lock);
1796
1797 sk_for_each(s, &x25_list)
1798 if (x25_sk(s)->neighbour == nb)
1799 x25_disconnect(s, ENETUNREACH, 0, 0);
1800
1801 write_unlock_bh(&x25_list_lock);
1802
1803 /* Remove any related forwards */
1804 x25_clear_forward_by_dev(nb->dev);
1805 }
1806
1807 static int __init x25_init(void)
1808 {
1809 int rc;
1810
1811 rc = proto_register(&x25_proto, 0);
1812 if (rc)
1813 goto out;
1814
1815 rc = sock_register(&x25_family_ops);
1816 if (rc)
1817 goto out_proto;
1818
1819 dev_add_pack(&x25_packet_type);
1820
1821 rc = register_netdevice_notifier(&x25_dev_notifier);
1822 if (rc)
1823 goto out_sock;
1824
1825 rc = x25_register_sysctl();
1826 if (rc)
1827 goto out_dev;
1828
1829 rc = x25_proc_init();
1830 if (rc)
1831 goto out_sysctl;
1832
1833 pr_info("Linux Version 0.2\n");
1834
1835 out:
1836 return rc;
1837 out_sysctl:
1838 x25_unregister_sysctl();
1839 out_dev:
1840 unregister_netdevice_notifier(&x25_dev_notifier);
1841 out_sock:
1842 dev_remove_pack(&x25_packet_type);
1843 sock_unregister(AF_X25);
1844 out_proto:
1845 proto_unregister(&x25_proto);
1846 goto out;
1847 }
1848 module_init(x25_init);
1849
1850 static void __exit x25_exit(void)
1851 {
1852 x25_proc_exit();
1853 x25_link_free();
1854 x25_route_free();
1855
1856 x25_unregister_sysctl();
1857
1858 unregister_netdevice_notifier(&x25_dev_notifier);
1859
1860 dev_remove_pack(&x25_packet_type);
1861
1862 sock_unregister(AF_X25);
1863 proto_unregister(&x25_proto);
1864 }
1865 module_exit(x25_exit);
1866
1867 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1868 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1869 MODULE_LICENSE("GPL");
1870 MODULE_ALIAS_NETPROTO(PF_X25);
Linux with added FPC-III support