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packets: Always register packet sk in the same order
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / net / x25 / af_x25.c
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);
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(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 rc = -EINVAL;
684 goto out;
685 }
686
687 len = strlen(addr->sx25_addr.x25_addr);
688 for (i = 0; i < len; i++) {
689 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
690 rc = -EINVAL;
691 goto out;
692 }
693 }
694
695 lock_sock(sk);
696 if (sock_flag(sk, SOCK_ZAPPED)) {
697 x25_sk(sk)->source_addr = addr->sx25_addr;
698 x25_insert_socket(sk);
699 sock_reset_flag(sk, SOCK_ZAPPED);
700 } else {
701 rc = -EINVAL;
702 }
703 release_sock(sk);
704 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
705 out:
706 return rc;
707 }
708
709 static int x25_wait_for_connection_establishment(struct sock *sk)
710 {
711 DECLARE_WAITQUEUE(wait, current);
712 int rc;
713
714 add_wait_queue_exclusive(sk_sleep(sk), &wait);
715 for (;;) {
716 __set_current_state(TASK_INTERRUPTIBLE);
717 rc = -ERESTARTSYS;
718 if (signal_pending(current))
719 break;
720 rc = sock_error(sk);
721 if (rc) {
722 sk->sk_socket->state = SS_UNCONNECTED;
723 break;
724 }
725 rc = 0;
726 if (sk->sk_state != TCP_ESTABLISHED) {
727 release_sock(sk);
728 schedule();
729 lock_sock(sk);
730 } else
731 break;
732 }
733 __set_current_state(TASK_RUNNING);
734 remove_wait_queue(sk_sleep(sk), &wait);
735 return rc;
736 }
737
738 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
739 int addr_len, int flags)
740 {
741 struct sock *sk = sock->sk;
742 struct x25_sock *x25 = x25_sk(sk);
743 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
744 struct x25_route *rt;
745 int rc = 0;
746
747 lock_sock(sk);
748 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
749 sock->state = SS_CONNECTED;
750 goto out; /* Connect completed during a ERESTARTSYS event */
751 }
752
753 rc = -ECONNREFUSED;
754 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
755 sock->state = SS_UNCONNECTED;
756 goto out;
757 }
758
759 rc = -EISCONN; /* No reconnect on a seqpacket socket */
760 if (sk->sk_state == TCP_ESTABLISHED)
761 goto out;
762
763 sk->sk_state = TCP_CLOSE;
764 sock->state = SS_UNCONNECTED;
765
766 rc = -EINVAL;
767 if (addr_len != sizeof(struct sockaddr_x25) ||
768 addr->sx25_family != AF_X25)
769 goto out;
770
771 rc = -ENETUNREACH;
772 rt = x25_get_route(&addr->sx25_addr);
773 if (!rt)
774 goto out;
775
776 x25->neighbour = x25_get_neigh(rt->dev);
777 if (!x25->neighbour)
778 goto out_put_route;
779
780 x25_limit_facilities(&x25->facilities, x25->neighbour);
781
782 x25->lci = x25_new_lci(x25->neighbour);
783 if (!x25->lci)
784 goto out_put_neigh;
785
786 rc = -EINVAL;
787 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
788 goto out_put_neigh;
789
790 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
791 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
792
793 x25->dest_addr = addr->sx25_addr;
794
795 /* Move to connecting socket, start sending Connect Requests */
796 sock->state = SS_CONNECTING;
797 sk->sk_state = TCP_SYN_SENT;
798
799 x25->state = X25_STATE_1;
800
801 x25_write_internal(sk, X25_CALL_REQUEST);
802
803 x25_start_heartbeat(sk);
804 x25_start_t21timer(sk);
805
806 /* Now the loop */
807 rc = -EINPROGRESS;
808 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
809 goto out_put_neigh;
810
811 rc = x25_wait_for_connection_establishment(sk);
812 if (rc)
813 goto out_put_neigh;
814
815 sock->state = SS_CONNECTED;
816 rc = 0;
817 out_put_neigh:
818 if (rc) {
819 read_lock_bh(&x25_list_lock);
820 x25_neigh_put(x25->neighbour);
821 x25->neighbour = NULL;
822 read_unlock_bh(&x25_list_lock);
823 x25->state = X25_STATE_0;
824 }
825 out_put_route:
826 x25_route_put(rt);
827 out:
828 release_sock(sk);
829 return rc;
830 }
831
832 static int x25_wait_for_data(struct sock *sk, long timeout)
833 {
834 DECLARE_WAITQUEUE(wait, current);
835 int rc = 0;
836
837 add_wait_queue_exclusive(sk_sleep(sk), &wait);
838 for (;;) {
839 __set_current_state(TASK_INTERRUPTIBLE);
840 if (sk->sk_shutdown & RCV_SHUTDOWN)
841 break;
842 rc = -ERESTARTSYS;
843 if (signal_pending(current))
844 break;
845 rc = -EAGAIN;
846 if (!timeout)
847 break;
848 rc = 0;
849 if (skb_queue_empty(&sk->sk_receive_queue)) {
850 release_sock(sk);
851 timeout = schedule_timeout(timeout);
852 lock_sock(sk);
853 } else
854 break;
855 }
856 __set_current_state(TASK_RUNNING);
857 remove_wait_queue(sk_sleep(sk), &wait);
858 return rc;
859 }
860
861 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
862 bool kern)
863 {
864 struct sock *sk = sock->sk;
865 struct sock *newsk;
866 struct sk_buff *skb;
867 int rc = -EINVAL;
868
869 if (!sk)
870 goto out;
871
872 rc = -EOPNOTSUPP;
873 if (sk->sk_type != SOCK_SEQPACKET)
874 goto out;
875
876 lock_sock(sk);
877 rc = -EINVAL;
878 if (sk->sk_state != TCP_LISTEN)
879 goto out2;
880
881 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
882 if (rc)
883 goto out2;
884 skb = skb_dequeue(&sk->sk_receive_queue);
885 rc = -EINVAL;
886 if (!skb->sk)
887 goto out2;
888 newsk = skb->sk;
889 sock_graft(newsk, newsock);
890
891 /* Now attach up the new socket */
892 skb->sk = NULL;
893 kfree_skb(skb);
894 sk->sk_ack_backlog--;
895 newsock->state = SS_CONNECTED;
896 rc = 0;
897 out2:
898 release_sock(sk);
899 out:
900 return rc;
901 }
902
903 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
904 int *uaddr_len, int peer)
905 {
906 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
907 struct sock *sk = sock->sk;
908 struct x25_sock *x25 = x25_sk(sk);
909 int rc = 0;
910
911 if (peer) {
912 if (sk->sk_state != TCP_ESTABLISHED) {
913 rc = -ENOTCONN;
914 goto out;
915 }
916 sx25->sx25_addr = x25->dest_addr;
917 } else
918 sx25->sx25_addr = x25->source_addr;
919
920 sx25->sx25_family = AF_X25;
921 *uaddr_len = sizeof(*sx25);
922
923 out:
924 return rc;
925 }
926
927 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
928 unsigned int lci)
929 {
930 struct sock *sk;
931 struct sock *make;
932 struct x25_sock *makex25;
933 struct x25_address source_addr, dest_addr;
934 struct x25_facilities facilities;
935 struct x25_dte_facilities dte_facilities;
936 int len, addr_len, rc;
937
938 /*
939 * Remove the LCI and frame type.
940 */
941 skb_pull(skb, X25_STD_MIN_LEN);
942
943 /*
944 * Extract the X.25 addresses and convert them to ASCII strings,
945 * and remove them.
946 *
947 * Address block is mandatory in call request packets
948 */
949 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
950 if (addr_len <= 0)
951 goto out_clear_request;
952 skb_pull(skb, addr_len);
953
954 /*
955 * Get the length of the facilities, skip past them for the moment
956 * get the call user data because this is needed to determine
957 * the correct listener
958 *
959 * Facilities length is mandatory in call request packets
960 */
961 if (!pskb_may_pull(skb, 1))
962 goto out_clear_request;
963 len = skb->data[0] + 1;
964 if (!pskb_may_pull(skb, len))
965 goto out_clear_request;
966 skb_pull(skb,len);
967
968 /*
969 * Ensure that the amount of call user data is valid.
970 */
971 if (skb->len > X25_MAX_CUD_LEN)
972 goto out_clear_request;
973
974 /*
975 * Get all the call user data so it can be used in
976 * x25_find_listener and skb_copy_from_linear_data up ahead.
977 */
978 if (!pskb_may_pull(skb, skb->len))
979 goto out_clear_request;
980
981 /*
982 * Find a listener for the particular address/cud pair.
983 */
984 sk = x25_find_listener(&source_addr,skb);
985 skb_push(skb,len);
986
987 if (sk != NULL && sk_acceptq_is_full(sk)) {
988 goto out_sock_put;
989 }
990
991 /*
992 * We dont have any listeners for this incoming call.
993 * Try forwarding it.
994 */
995 if (sk == NULL) {
996 skb_push(skb, addr_len + X25_STD_MIN_LEN);
997 if (sysctl_x25_forward &&
998 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
999 {
1000 /* Call was forwarded, dont process it any more */
1001 kfree_skb(skb);
1002 rc = 1;
1003 goto out;
1004 } else {
1005 /* No listeners, can't forward, clear the call */
1006 goto out_clear_request;
1007 }
1008 }
1009
1010 /*
1011 * Try to reach a compromise on the requested facilities.
1012 */
1013 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1014 if (len == -1)
1015 goto out_sock_put;
1016
1017 /*
1018 * current neighbour/link might impose additional limits
1019 * on certain facilties
1020 */
1021
1022 x25_limit_facilities(&facilities, nb);
1023
1024 /*
1025 * Try to create a new socket.
1026 */
1027 make = x25_make_new(sk);
1028 if (!make)
1029 goto out_sock_put;
1030
1031 /*
1032 * Remove the facilities
1033 */
1034 skb_pull(skb, len);
1035
1036 skb->sk = make;
1037 make->sk_state = TCP_ESTABLISHED;
1038
1039 makex25 = x25_sk(make);
1040 makex25->lci = lci;
1041 makex25->dest_addr = dest_addr;
1042 makex25->source_addr = source_addr;
1043 makex25->neighbour = nb;
1044 makex25->facilities = facilities;
1045 makex25->dte_facilities= dte_facilities;
1046 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1047 /* ensure no reverse facil on accept */
1048 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1049 /* ensure no calling address extension on accept */
1050 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1051 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1052
1053 /* Normally all calls are accepted immediately */
1054 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1055 x25_write_internal(make, X25_CALL_ACCEPTED);
1056 makex25->state = X25_STATE_3;
1057 }
1058
1059 /*
1060 * Incoming Call User Data.
1061 */
1062 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1063 makex25->calluserdata.cudlength = skb->len;
1064
1065 sk->sk_ack_backlog++;
1066
1067 x25_insert_socket(make);
1068
1069 skb_queue_head(&sk->sk_receive_queue, skb);
1070
1071 x25_start_heartbeat(make);
1072
1073 if (!sock_flag(sk, SOCK_DEAD))
1074 sk->sk_data_ready(sk);
1075 rc = 1;
1076 sock_put(sk);
1077 out:
1078 return rc;
1079 out_sock_put:
1080 sock_put(sk);
1081 out_clear_request:
1082 rc = 0;
1083 x25_transmit_clear_request(nb, lci, 0x01);
1084 goto out;
1085 }
1086
1087 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1088 {
1089 struct sock *sk = sock->sk;
1090 struct x25_sock *x25 = x25_sk(sk);
1091 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1092 struct sockaddr_x25 sx25;
1093 struct sk_buff *skb;
1094 unsigned char *asmptr;
1095 int noblock = msg->msg_flags & MSG_DONTWAIT;
1096 size_t size;
1097 int qbit = 0, rc = -EINVAL;
1098
1099 lock_sock(sk);
1100 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1101 goto out;
1102
1103 /* we currently don't support segmented records at the user interface */
1104 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1105 goto out;
1106
1107 rc = -EADDRNOTAVAIL;
1108 if (sock_flag(sk, SOCK_ZAPPED))
1109 goto out;
1110
1111 rc = -EPIPE;
1112 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1113 send_sig(SIGPIPE, current, 0);
1114 goto out;
1115 }
1116
1117 rc = -ENETUNREACH;
1118 if (!x25->neighbour)
1119 goto out;
1120
1121 if (usx25) {
1122 rc = -EINVAL;
1123 if (msg->msg_namelen < sizeof(sx25))
1124 goto out;
1125 memcpy(&sx25, usx25, sizeof(sx25));
1126 rc = -EISCONN;
1127 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1128 goto out;
1129 rc = -EINVAL;
1130 if (sx25.sx25_family != AF_X25)
1131 goto out;
1132 } else {
1133 /*
1134 * FIXME 1003.1g - if the socket is like this because
1135 * it has become closed (not started closed) we ought
1136 * to SIGPIPE, EPIPE;
1137 */
1138 rc = -ENOTCONN;
1139 if (sk->sk_state != TCP_ESTABLISHED)
1140 goto out;
1141
1142 sx25.sx25_family = AF_X25;
1143 sx25.sx25_addr = x25->dest_addr;
1144 }
1145
1146 /* Sanity check the packet size */
1147 if (len > 65535) {
1148 rc = -EMSGSIZE;
1149 goto out;
1150 }
1151
1152 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1153
1154 /* Build a packet */
1155 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1156
1157 if ((msg->msg_flags & MSG_OOB) && len > 32)
1158 len = 32;
1159
1160 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1161
1162 release_sock(sk);
1163 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1164 lock_sock(sk);
1165 if (!skb)
1166 goto out;
1167 X25_SKB_CB(skb)->flags = msg->msg_flags;
1168
1169 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1170
1171 /*
1172 * Put the data on the end
1173 */
1174 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1175
1176 skb_reset_transport_header(skb);
1177 skb_put(skb, len);
1178
1179 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1180 if (rc)
1181 goto out_kfree_skb;
1182
1183 /*
1184 * If the Q BIT Include socket option is in force, the first
1185 * byte of the user data is the logical value of the Q Bit.
1186 */
1187 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1188 if (!pskb_may_pull(skb, 1))
1189 goto out_kfree_skb;
1190
1191 qbit = skb->data[0];
1192 skb_pull(skb, 1);
1193 }
1194
1195 /*
1196 * Push down the X.25 header
1197 */
1198 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1199
1200 if (msg->msg_flags & MSG_OOB) {
1201 if (x25->neighbour->extended) {
1202 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1203 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1204 *asmptr++ = (x25->lci >> 0) & 0xFF;
1205 *asmptr++ = X25_INTERRUPT;
1206 } else {
1207 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1209 *asmptr++ = (x25->lci >> 0) & 0xFF;
1210 *asmptr++ = X25_INTERRUPT;
1211 }
1212 } else {
1213 if (x25->neighbour->extended) {
1214 /* Build an Extended X.25 header */
1215 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217 *asmptr++ = (x25->lci >> 0) & 0xFF;
1218 *asmptr++ = X25_DATA;
1219 *asmptr++ = X25_DATA;
1220 } else {
1221 /* Build an Standard X.25 header */
1222 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1223 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1224 *asmptr++ = (x25->lci >> 0) & 0xFF;
1225 *asmptr++ = X25_DATA;
1226 }
1227
1228 if (qbit)
1229 skb->data[0] |= X25_Q_BIT;
1230 }
1231
1232 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1233 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1234
1235 rc = -ENOTCONN;
1236 if (sk->sk_state != TCP_ESTABLISHED)
1237 goto out_kfree_skb;
1238
1239 if (msg->msg_flags & MSG_OOB)
1240 skb_queue_tail(&x25->interrupt_out_queue, skb);
1241 else {
1242 rc = x25_output(sk, skb);
1243 len = rc;
1244 if (rc < 0)
1245 kfree_skb(skb);
1246 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1247 len++;
1248 }
1249
1250 x25_kick(sk);
1251 rc = len;
1252 out:
1253 release_sock(sk);
1254 return rc;
1255 out_kfree_skb:
1256 kfree_skb(skb);
1257 goto out;
1258 }
1259
1260
1261 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1262 int flags)
1263 {
1264 struct sock *sk = sock->sk;
1265 struct x25_sock *x25 = x25_sk(sk);
1266 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1267 size_t copied;
1268 int qbit, header_len;
1269 struct sk_buff *skb;
1270 unsigned char *asmptr;
1271 int rc = -ENOTCONN;
1272
1273 lock_sock(sk);
1274
1275 if (x25->neighbour == NULL)
1276 goto out;
1277
1278 header_len = x25->neighbour->extended ?
1279 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1280
1281 /*
1282 * This works for seqpacket too. The receiver has ordered the queue for
1283 * us! We do one quick check first though
1284 */
1285 if (sk->sk_state != TCP_ESTABLISHED)
1286 goto out;
1287
1288 if (flags & MSG_OOB) {
1289 rc = -EINVAL;
1290 if (sock_flag(sk, SOCK_URGINLINE) ||
1291 !skb_peek(&x25->interrupt_in_queue))
1292 goto out;
1293
1294 skb = skb_dequeue(&x25->interrupt_in_queue);
1295
1296 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1297 goto out_free_dgram;
1298
1299 skb_pull(skb, X25_STD_MIN_LEN);
1300
1301 /*
1302 * No Q bit information on Interrupt data.
1303 */
1304 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1305 asmptr = skb_push(skb, 1);
1306 *asmptr = 0x00;
1307 }
1308
1309 msg->msg_flags |= MSG_OOB;
1310 } else {
1311 /* Now we can treat all alike */
1312 release_sock(sk);
1313 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1314 flags & MSG_DONTWAIT, &rc);
1315 lock_sock(sk);
1316 if (!skb)
1317 goto out;
1318
1319 if (!pskb_may_pull(skb, header_len))
1320 goto out_free_dgram;
1321
1322 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1323
1324 skb_pull(skb, header_len);
1325
1326 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1327 asmptr = skb_push(skb, 1);
1328 *asmptr = qbit;
1329 }
1330 }
1331
1332 skb_reset_transport_header(skb);
1333 copied = skb->len;
1334
1335 if (copied > size) {
1336 copied = size;
1337 msg->msg_flags |= MSG_TRUNC;
1338 }
1339
1340 /* Currently, each datagram always contains a complete record */
1341 msg->msg_flags |= MSG_EOR;
1342
1343 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1344 if (rc)
1345 goto out_free_dgram;
1346
1347 if (sx25) {
1348 sx25->sx25_family = AF_X25;
1349 sx25->sx25_addr = x25->dest_addr;
1350 msg->msg_namelen = sizeof(*sx25);
1351 }
1352
1353 x25_check_rbuf(sk);
1354 rc = copied;
1355 out_free_dgram:
1356 skb_free_datagram(sk, skb);
1357 out:
1358 release_sock(sk);
1359 return rc;
1360 }
1361
1362
1363 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1364 {
1365 struct sock *sk = sock->sk;
1366 struct x25_sock *x25 = x25_sk(sk);
1367 void __user *argp = (void __user *)arg;
1368 int rc;
1369
1370 switch (cmd) {
1371 case TIOCOUTQ: {
1372 int amount;
1373
1374 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1375 if (amount < 0)
1376 amount = 0;
1377 rc = put_user(amount, (unsigned int __user *)argp);
1378 break;
1379 }
1380
1381 case TIOCINQ: {
1382 struct sk_buff *skb;
1383 int amount = 0;
1384 /*
1385 * These two are safe on a single CPU system as
1386 * only user tasks fiddle here
1387 */
1388 lock_sock(sk);
1389 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1390 amount = skb->len;
1391 release_sock(sk);
1392 rc = put_user(amount, (unsigned int __user *)argp);
1393 break;
1394 }
1395
1396 case SIOCGSTAMP:
1397 rc = -EINVAL;
1398 if (sk)
1399 rc = sock_get_timestamp(sk,
1400 (struct timeval __user *)argp);
1401 break;
1402 case SIOCGSTAMPNS:
1403 rc = -EINVAL;
1404 if (sk)
1405 rc = sock_get_timestampns(sk,
1406 (struct timespec __user *)argp);
1407 break;
1408 case SIOCGIFADDR:
1409 case SIOCSIFADDR:
1410 case SIOCGIFDSTADDR:
1411 case SIOCSIFDSTADDR:
1412 case SIOCGIFBRDADDR:
1413 case SIOCSIFBRDADDR:
1414 case SIOCGIFNETMASK:
1415 case SIOCSIFNETMASK:
1416 case SIOCGIFMETRIC:
1417 case SIOCSIFMETRIC:
1418 rc = -EINVAL;
1419 break;
1420 case SIOCADDRT:
1421 case SIOCDELRT:
1422 rc = -EPERM;
1423 if (!capable(CAP_NET_ADMIN))
1424 break;
1425 rc = x25_route_ioctl(cmd, argp);
1426 break;
1427 case SIOCX25GSUBSCRIP:
1428 rc = x25_subscr_ioctl(cmd, argp);
1429 break;
1430 case SIOCX25SSUBSCRIP:
1431 rc = -EPERM;
1432 if (!capable(CAP_NET_ADMIN))
1433 break;
1434 rc = x25_subscr_ioctl(cmd, argp);
1435 break;
1436 case SIOCX25GFACILITIES: {
1437 lock_sock(sk);
1438 rc = copy_to_user(argp, &x25->facilities,
1439 sizeof(x25->facilities))
1440 ? -EFAULT : 0;
1441 release_sock(sk);
1442 break;
1443 }
1444
1445 case SIOCX25SFACILITIES: {
1446 struct x25_facilities facilities;
1447 rc = -EFAULT;
1448 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1449 break;
1450 rc = -EINVAL;
1451 lock_sock(sk);
1452 if (sk->sk_state != TCP_LISTEN &&
1453 sk->sk_state != TCP_CLOSE)
1454 goto out_fac_release;
1455 if (facilities.pacsize_in < X25_PS16 ||
1456 facilities.pacsize_in > X25_PS4096)
1457 goto out_fac_release;
1458 if (facilities.pacsize_out < X25_PS16 ||
1459 facilities.pacsize_out > X25_PS4096)
1460 goto out_fac_release;
1461 if (facilities.winsize_in < 1 ||
1462 facilities.winsize_in > 127)
1463 goto out_fac_release;
1464 if (facilities.throughput) {
1465 int out = facilities.throughput & 0xf0;
1466 int in = facilities.throughput & 0x0f;
1467 if (!out)
1468 facilities.throughput |=
1469 X25_DEFAULT_THROUGHPUT << 4;
1470 else if (out < 0x30 || out > 0xD0)
1471 goto out_fac_release;
1472 if (!in)
1473 facilities.throughput |=
1474 X25_DEFAULT_THROUGHPUT;
1475 else if (in < 0x03 || in > 0x0D)
1476 goto out_fac_release;
1477 }
1478 if (facilities.reverse &&
1479 (facilities.reverse & 0x81) != 0x81)
1480 goto out_fac_release;
1481 x25->facilities = facilities;
1482 rc = 0;
1483 out_fac_release:
1484 release_sock(sk);
1485 break;
1486 }
1487
1488 case SIOCX25GDTEFACILITIES: {
1489 lock_sock(sk);
1490 rc = copy_to_user(argp, &x25->dte_facilities,
1491 sizeof(x25->dte_facilities));
1492 release_sock(sk);
1493 if (rc)
1494 rc = -EFAULT;
1495 break;
1496 }
1497
1498 case SIOCX25SDTEFACILITIES: {
1499 struct x25_dte_facilities dtefacs;
1500 rc = -EFAULT;
1501 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1502 break;
1503 rc = -EINVAL;
1504 lock_sock(sk);
1505 if (sk->sk_state != TCP_LISTEN &&
1506 sk->sk_state != TCP_CLOSE)
1507 goto out_dtefac_release;
1508 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1509 goto out_dtefac_release;
1510 if (dtefacs.called_len > X25_MAX_AE_LEN)
1511 goto out_dtefac_release;
1512 x25->dte_facilities = dtefacs;
1513 rc = 0;
1514 out_dtefac_release:
1515 release_sock(sk);
1516 break;
1517 }
1518
1519 case SIOCX25GCALLUSERDATA: {
1520 lock_sock(sk);
1521 rc = copy_to_user(argp, &x25->calluserdata,
1522 sizeof(x25->calluserdata))
1523 ? -EFAULT : 0;
1524 release_sock(sk);
1525 break;
1526 }
1527
1528 case SIOCX25SCALLUSERDATA: {
1529 struct x25_calluserdata calluserdata;
1530
1531 rc = -EFAULT;
1532 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1533 break;
1534 rc = -EINVAL;
1535 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1536 break;
1537 lock_sock(sk);
1538 x25->calluserdata = calluserdata;
1539 release_sock(sk);
1540 rc = 0;
1541 break;
1542 }
1543
1544 case SIOCX25GCAUSEDIAG: {
1545 lock_sock(sk);
1546 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1547 ? -EFAULT : 0;
1548 release_sock(sk);
1549 break;
1550 }
1551
1552 case SIOCX25SCAUSEDIAG: {
1553 struct x25_causediag causediag;
1554 rc = -EFAULT;
1555 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1556 break;
1557 lock_sock(sk);
1558 x25->causediag = causediag;
1559 release_sock(sk);
1560 rc = 0;
1561 break;
1562
1563 }
1564
1565 case SIOCX25SCUDMATCHLEN: {
1566 struct x25_subaddr sub_addr;
1567 rc = -EINVAL;
1568 lock_sock(sk);
1569 if(sk->sk_state != TCP_CLOSE)
1570 goto out_cud_release;
1571 rc = -EFAULT;
1572 if (copy_from_user(&sub_addr, argp,
1573 sizeof(sub_addr)))
1574 goto out_cud_release;
1575 rc = -EINVAL;
1576 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1577 goto out_cud_release;
1578 x25->cudmatchlength = sub_addr.cudmatchlength;
1579 rc = 0;
1580 out_cud_release:
1581 release_sock(sk);
1582 break;
1583 }
1584
1585 case SIOCX25CALLACCPTAPPRV: {
1586 rc = -EINVAL;
1587 lock_sock(sk);
1588 if (sk->sk_state == TCP_CLOSE) {
1589 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1590 rc = 0;
1591 }
1592 release_sock(sk);
1593 break;
1594 }
1595
1596 case SIOCX25SENDCALLACCPT: {
1597 rc = -EINVAL;
1598 lock_sock(sk);
1599 if (sk->sk_state != TCP_ESTABLISHED)
1600 goto out_sendcallaccpt_release;
1601 /* must call accptapprv above */
1602 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1603 goto out_sendcallaccpt_release;
1604 x25_write_internal(sk, X25_CALL_ACCEPTED);
1605 x25->state = X25_STATE_3;
1606 rc = 0;
1607 out_sendcallaccpt_release:
1608 release_sock(sk);
1609 break;
1610 }
1611
1612 default:
1613 rc = -ENOIOCTLCMD;
1614 break;
1615 }
1616
1617 return rc;
1618 }
1619
1620 static const struct net_proto_family x25_family_ops = {
1621 .family = AF_X25,
1622 .create = x25_create,
1623 .owner = THIS_MODULE,
1624 };
1625
1626 #ifdef CONFIG_COMPAT
1627 static int compat_x25_subscr_ioctl(unsigned int cmd,
1628 struct compat_x25_subscrip_struct __user *x25_subscr32)
1629 {
1630 struct compat_x25_subscrip_struct x25_subscr;
1631 struct x25_neigh *nb;
1632 struct net_device *dev;
1633 int rc = -EINVAL;
1634
1635 rc = -EFAULT;
1636 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637 goto out;
1638
1639 rc = -EINVAL;
1640 dev = x25_dev_get(x25_subscr.device);
1641 if (dev == NULL)
1642 goto out;
1643
1644 nb = x25_get_neigh(dev);
1645 if (nb == NULL)
1646 goto out_dev_put;
1647
1648 dev_put(dev);
1649
1650 if (cmd == SIOCX25GSUBSCRIP) {
1651 read_lock_bh(&x25_neigh_list_lock);
1652 x25_subscr.extended = nb->extended;
1653 x25_subscr.global_facil_mask = nb->global_facil_mask;
1654 read_unlock_bh(&x25_neigh_list_lock);
1655 rc = copy_to_user(x25_subscr32, &x25_subscr,
1656 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657 } else {
1658 rc = -EINVAL;
1659 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660 rc = 0;
1661 write_lock_bh(&x25_neigh_list_lock);
1662 nb->extended = x25_subscr.extended;
1663 nb->global_facil_mask = x25_subscr.global_facil_mask;
1664 write_unlock_bh(&x25_neigh_list_lock);
1665 }
1666 }
1667 x25_neigh_put(nb);
1668 out:
1669 return rc;
1670 out_dev_put:
1671 dev_put(dev);
1672 goto out;
1673 }
1674
1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676 unsigned long arg)
1677 {
1678 void __user *argp = compat_ptr(arg);
1679 struct sock *sk = sock->sk;
1680
1681 int rc = -ENOIOCTLCMD;
1682
1683 switch(cmd) {
1684 case TIOCOUTQ:
1685 case TIOCINQ:
1686 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1687 break;
1688 case SIOCGSTAMP:
1689 rc = -EINVAL;
1690 if (sk)
1691 rc = compat_sock_get_timestamp(sk,
1692 (struct timeval __user*)argp);
1693 break;
1694 case SIOCGSTAMPNS:
1695 rc = -EINVAL;
1696 if (sk)
1697 rc = compat_sock_get_timestampns(sk,
1698 (struct timespec __user*)argp);
1699 break;
1700 case SIOCGIFADDR:
1701 case SIOCSIFADDR:
1702 case SIOCGIFDSTADDR:
1703 case SIOCSIFDSTADDR:
1704 case SIOCGIFBRDADDR:
1705 case SIOCSIFBRDADDR:
1706 case SIOCGIFNETMASK:
1707 case SIOCSIFNETMASK:
1708 case SIOCGIFMETRIC:
1709 case SIOCSIFMETRIC:
1710 rc = -EINVAL;
1711 break;
1712 case SIOCADDRT:
1713 case SIOCDELRT:
1714 rc = -EPERM;
1715 if (!capable(CAP_NET_ADMIN))
1716 break;
1717 rc = x25_route_ioctl(cmd, argp);
1718 break;
1719 case SIOCX25GSUBSCRIP:
1720 rc = compat_x25_subscr_ioctl(cmd, argp);
1721 break;
1722 case SIOCX25SSUBSCRIP:
1723 rc = -EPERM;
1724 if (!capable(CAP_NET_ADMIN))
1725 break;
1726 rc = compat_x25_subscr_ioctl(cmd, argp);
1727 break;
1728 case SIOCX25GFACILITIES:
1729 case SIOCX25SFACILITIES:
1730 case SIOCX25GDTEFACILITIES:
1731 case SIOCX25SDTEFACILITIES:
1732 case SIOCX25GCALLUSERDATA:
1733 case SIOCX25SCALLUSERDATA:
1734 case SIOCX25GCAUSEDIAG:
1735 case SIOCX25SCAUSEDIAG:
1736 case SIOCX25SCUDMATCHLEN:
1737 case SIOCX25CALLACCPTAPPRV:
1738 case SIOCX25SENDCALLACCPT:
1739 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1740 break;
1741 default:
1742 rc = -ENOIOCTLCMD;
1743 break;
1744 }
1745 return rc;
1746 }
1747 #endif
1748
1749 static const struct proto_ops x25_proto_ops = {
1750 .family = AF_X25,
1751 .owner = THIS_MODULE,
1752 .release = x25_release,
1753 .bind = x25_bind,
1754 .connect = x25_connect,
1755 .socketpair = sock_no_socketpair,
1756 .accept = x25_accept,
1757 .getname = x25_getname,
1758 .poll = datagram_poll,
1759 .ioctl = x25_ioctl,
1760 #ifdef CONFIG_COMPAT
1761 .compat_ioctl = compat_x25_ioctl,
1762 #endif
1763 .listen = x25_listen,
1764 .shutdown = sock_no_shutdown,
1765 .setsockopt = x25_setsockopt,
1766 .getsockopt = x25_getsockopt,
1767 .sendmsg = x25_sendmsg,
1768 .recvmsg = x25_recvmsg,
1769 .mmap = sock_no_mmap,
1770 .sendpage = sock_no_sendpage,
1771 };
1772
1773 static struct packet_type x25_packet_type __read_mostly = {
1774 .type = cpu_to_be16(ETH_P_X25),
1775 .func = x25_lapb_receive_frame,
1776 };
1777
1778 static struct notifier_block x25_dev_notifier = {
1779 .notifier_call = x25_device_event,
1780 };
1781
1782 void x25_kill_by_neigh(struct x25_neigh *nb)
1783 {
1784 struct sock *s;
1785
1786 write_lock_bh(&x25_list_lock);
1787
1788 sk_for_each(s, &x25_list)
1789 if (x25_sk(s)->neighbour == nb)
1790 x25_disconnect(s, ENETUNREACH, 0, 0);
1791
1792 write_unlock_bh(&x25_list_lock);
1793
1794 /* Remove any related forwards */
1795 x25_clear_forward_by_dev(nb->dev);
1796 }
1797
1798 static int __init x25_init(void)
1799 {
1800 int rc;
1801
1802 rc = proto_register(&x25_proto, 0);
1803 if (rc)
1804 goto out;
1805
1806 rc = sock_register(&x25_family_ops);
1807 if (rc)
1808 goto out_proto;
1809
1810 dev_add_pack(&x25_packet_type);
1811
1812 rc = register_netdevice_notifier(&x25_dev_notifier);
1813 if (rc)
1814 goto out_sock;
1815
1816 rc = x25_register_sysctl();
1817 if (rc)
1818 goto out_dev;
1819
1820 rc = x25_proc_init();
1821 if (rc)
1822 goto out_sysctl;
1823
1824 pr_info("Linux Version 0.2\n");
1825
1826 out:
1827 return rc;
1828 out_sysctl:
1829 x25_unregister_sysctl();
1830 out_dev:
1831 unregister_netdevice_notifier(&x25_dev_notifier);
1832 out_sock:
1833 dev_remove_pack(&x25_packet_type);
1834 sock_unregister(AF_X25);
1835 out_proto:
1836 proto_unregister(&x25_proto);
1837 goto out;
1838 }
1839 module_init(x25_init);
1840
1841 static void __exit x25_exit(void)
1842 {
1843 x25_proc_exit();
1844 x25_link_free();
1845 x25_route_free();
1846
1847 x25_unregister_sysctl();
1848
1849 unregister_netdevice_notifier(&x25_dev_notifier);
1850
1851 dev_remove_pack(&x25_packet_type);
1852
1853 sock_unregister(AF_X25);
1854 proto_unregister(&x25_proto);
1855 }
1856 module_exit(x25_exit);
1857
1858 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1859 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1860 MODULE_LICENSE("GPL");
1861 MODULE_ALIAS_NETPROTO(PF_X25);